/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Parser for MPEG streams * * Copyright (c) 2007 Michael Sevakis * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "plugin.h" #include "mpegplayer.h" struct stream_parser str_parser SHAREDBSS_ATTR; static void parser_init_state(void) { str_parser.last_seek_time = 0; str_parser.format = STREAM_FMT_UNKNOWN; str_parser.start_pts = INVALID_TIMESTAMP; str_parser.end_pts = INVALID_TIMESTAMP; str_parser.flags = 0; str_parser.dims.w = 0; str_parser.dims.h = 0; } /* Place the stream in a state to begin parsing - sync will be performed * first */ void str_initialize(struct stream *str, off_t pos) { /* Initial positions start here */ str->hdr.win_left = str->hdr.win_right = pos; /* No packet */ str->curr_packet = NULL; /* Pick up parsing from this point in the buffer */ str->curr_packet_end = disk_buf_offset2ptr(pos); /* No flags */ str->pkt_flags = 0; /* Sync first */ str->state = SSTATE_SYNC; } /* Place the stream in an end of data state */ void str_end_of_stream(struct stream *str) { /* Offsets that prevent this stream from being included in the * min left/max right window so that no buffering is triggered on * its behalf. Set right to the min first so a thread reading the * overall window gets doesn't see this as valid no matter what the * file length. */ str->hdr.win_right = OFF_T_MIN; str->hdr.win_left = OFF_T_MAX; /* No packets */ str->curr_packet = str->curr_packet_end = NULL; /* No flags */ str->pkt_flags = 0; /* Fin */ str->state = SSTATE_END; } /* Return a timestamp at address p+offset if the marker bits are in tact */ static inline uint32_t read_pts(uint8_t *p, off_t offset) { return TS_CHECK_MARKERS(p, offset) ? TS_FROM_HEADER(p, offset) : INVALID_TIMESTAMP; } static inline bool validate_timestamp(uint32_t ts) { return ts >= str_parser.start_pts && ts <= str_parser.end_pts; } /* Find a start code before or after a given position */ uint8_t * mpeg_parser_scan_start_code(struct stream_scan *sk, uint32_t code) { stream_scan_normalize(sk); if (sk->dir < 0) { /* Reverse scan - start with at least the min needed */ stream_scan_offset(sk, 4); } code &= 0xff; /* Only the low byte matters */ while (sk->len >= 0 && sk->margin >= 4) { uint8_t *p; off_t pos = disk_buf_lseek(sk->pos, SEEK_SET); ssize_t len = disk_buf_getbuffer_l2(&sk->l2, 4, &p); if (pos < 0 || len < 4) break; if (CMP_3_CONST(p, PACKET_START_CODE_PREFIX) && p[3] == code) { return p; } stream_scan_offset(sk, 1); } return NULL; } /* Find a PES packet header for any stream - return stream to which it * belongs */ unsigned mpeg_parser_scan_pes(struct stream_scan *sk) { stream_scan_normalize(sk); if (sk->dir < 0) { /* Reverse scan - start with at least the min needed */ stream_scan_offset(sk, 4); } while (sk->len >= 0 && sk->margin >= 4) { uint8_t *p; off_t pos = disk_buf_lseek(sk->pos, SEEK_SET); ssize_t len = disk_buf_getbuffer_l2(&sk->l2, 4, &p); if (pos < 0 || len < 4) break; if (CMP_3_CONST(p, PACKET_START_CODE_PREFIX)) { unsigned id = p[3]; if (id >= 0xb9) return id; /* PES header */ /* else some video stream element */ } stream_scan_offset(sk, 1); } return -1; } /* Return the first SCR found from the scan direction */ uint32_t mpeg_parser_scan_scr(struct stream_scan *sk) { uint8_t *p = mpeg_parser_scan_start_code(sk, MPEG_STREAM_PACK_HEADER); if (p != NULL && sk->margin >= 9) /* 9 bytes total required */ { sk->data = 9; if ((p[4] & 0xc0) == 0x40) /* mpeg-2 */ { /* Lookhead p+8 */ if (MPEG2_CHECK_PACK_SCR_MARKERS(p, 4)) return MPEG2_PACK_HEADER_SCR(p, 4); } else if ((p[4] & 0xf0) == 0x20) /* mpeg-1 */ { /* Lookahead p+8 */ if (TS_CHECK_MARKERS(p, 4)) return TS_FROM_HEADER(p, 4); } /* Weird pack header */ sk->data = 5; } return INVALID_TIMESTAMP; } uint32_t mpeg_parser_scan_pts(struct stream_scan *sk, unsigned id) { stream_scan_normalize(sk); if (sk->dir < 0) { /* Reverse scan - start with at least the min needed */ stream_scan_offset(sk, 4); } while (sk->len >= 0 && sk->margin >= 4) { uint8_t *p; off_t pos = disk_buf_lseek(sk->pos, SEEK_SET); ssize_t len = disk_buf_getbuffer_l2(&sk->l2, 30, &p); if (pos < 0 || len < 4) break; if (CMP_3_CONST(p, PACKET_START_CODE_PREFIX) && p[3] == id) { uint8_t *h = p; if (sk->margin < 7) { /* Insufficient data */ } else if ((h[6] & 0xc0) == 0x80) /* mpeg2 */ { if (sk->margin >= 14 && (h[7] & 0x80) != 0x00) { sk->data = 14; return read_pts(h, 9); } } else /* mpeg1 */ { ssize_t l = 6; ssize_t margin = sk->margin; /* Skip stuffing_byte */ while (margin > 7 && h[l] == 0xff && ++l <= 22) --margin; if (margin >= 7) { if ((h[l] & 0xc0) == 0x40) { /* Skip STD_buffer_scale and STD_buffer_size */ margin -= 2; l += 2; } if (margin >= 5) { /* Header points to the mpeg1 pes header */ h += l; if ((h[0] & 0xe0) == 0x20) { /* PTS or PTS_DTS indicated */ sk->data = (h + 5) - p; return read_pts(h, 0); } } } } /* No PTS present - keep searching for a matching PES header with * one */ } stream_scan_offset(sk, 1); } return INVALID_TIMESTAMP; } static bool init_video_info(void) { DEBUGF("Getting movie size\n"); /* The decoder handles this in order to initialize its knowledge of the * movie parameters making seeking easier */ str_send_msg(&video_str, STREAM_RESET, 0); if (str_send_msg(&video_str, VIDEO_GET_SIZE, (intptr_t)&str_parser.dims) != 0) { return true; } DEBUGF(" failed\n"); return false; } static bool init_times(struct stream *str) { struct stream tmp_str; const ssize_t filesize = disk_buf_filesize(); const ssize_t max_probe = MIN(512*1024, filesize); bool found_stream; /* Simply find the first earliest timestamp - this will be the one * used when streaming anyway */ DEBUGF("Finding start_pts: 0x%02x\n", str->id); found_stream = false; str->start_pts = INVALID_TIMESTAMP; str->end_pts = INVALID_TIMESTAMP; tmp_str.id = str->id; tmp_str.hdr.pos = 0; tmp_str.hdr.limit = max_probe; /* Probe for many for the start because some stamps could be anomalous. * Video also can also have things out of order. Just see what it's got. */ while (1) { switch (parser_get_next_data(&tmp_str, STREAM_PM_RANDOM_ACCESS)) { case STREAM_DATA_END: break; case STREAM_OK: found_stream = true; if (tmp_str.pkt_flags & PKT_HAS_TS) { if (tmp_str.pts < str->start_pts) str->start_pts = tmp_str.pts; } continue; } break; } if (!found_stream) { DEBUGF(" stream not found:0x%02x\n", str->id); return false; } DEBUGF(" start:%u\n", (unsigned)str->start_pts); /* Use the decoder thread to perform a synchronized search - no * decoding should take place but just a simple run through timestamps * and durations as the decoder would see them. This should give the * precise time at the end of the last frame for the stream. */ DEBUGF("Finding end_pts: 0x%02x\n", str->id); str_parser.parms.sd.time = MAX_TIMESTAMP; str_parser.parms.sd.sk.pos = filesize - max_probe; str_parser.parms.sd.sk.len = max_probe; str_parser.parms.sd.sk.dir = SSCAN_FORWARD; str_send_msg(str, STREAM_RESET, 0); if (str_send_msg(str, STREAM_FIND_END_TIME, (intptr_t)&str_parser.parms.sd) == STREAM_PERFECT_MATCH) { str->end_pts = str_parser.parms.sd.time; DEBUGF(" end:%u\n", (unsigned)str->end_pts); } return true; } static bool check_times(const struct stream *str) { return str->start_pts < str->end_pts && str->end_pts != INVALID_TIMESTAMP; } /* Return the best-fit file offset of a timestamp in the PES where * timstamp <= time < next timestamp. Will try to return something reasonably * valid if best-fit could not be made. */ static off_t mpeg_parser_seek_PTS(uint32_t time, unsigned id) { ssize_t pos_left = 0; ssize_t pos_right = disk_buf.filesize; ssize_t pos, pos_new; uint32_t time_left = str_parser.start_pts; uint32_t time_right = str_parser.end_pts; uint32_t pts = 0; uint32_t prevpts = 0; enum state_enum state = STATE0; struct stream_scan sk; stream_scan_init(&sk); /* Initial estimate taken from average bitrate - later interpolations are * taken similarly based on the remaining file interval */ pos_new = muldiv_uint32(time - time_left, pos_right - pos_left, time_right - time_left) + pos_left; /* return this estimated position if nothing better comes up */ pos = pos_new; DEBUGF("Seeking stream 0x%02x\n", id); DEBUGF("$$ tl:%u t:%u ct:?? tr:%u\n pl:%ld pn:%ld pr:%ld\n", (unsigned)time_left, (unsigned)time, (unsigned)time_right, (long)pos_left, (long)pos_new, (long)pos_right); sk.dir = SSCAN_REVERSE; while (state < STATE9) { uint32_t currpts; sk.pos = pos_new; sk.len = (sk.dir < 0) ? pos_new - pos_left : pos_right - pos_new; currpts = mpeg_parser_scan_pts(&sk, id); if (currpts != INVALID_TIMESTAMP) { ssize_t pos_adj; /* Adjustment to over or under-estimate */ /* Found a valid timestamp - see were it lies in relation to * target */ if (currpts < time) { /* Time at current position is before seek time - move * forward */ if (currpts > pts) { /* This is less than the desired time but greater than * the currently seeked one; move the position up */ pts = currpts; pos = sk.pos; } /* No next timestamp can be sooner */ pos_left = sk.pos + sk.data; time_left = currpts; if (pos_right <= pos_left) break; /* If the window disappeared - we're done */ pos_new = muldiv_uint32(time - time_left, pos_right - pos_left, time_right - time_left); /* Point is ahead of us - fudge estimate a bit high */ pos_adj = pos_new / 10; if (pos_adj > 512*1024) pos_adj = 512*1024; pos_new += pos_left + pos_adj; if (pos_new >= pos_right) { /* Estimate could push too far */ pos_new = pos_right; } state = STATE2; /* Last scan was early */ sk.dir = SSCAN_REVERSE; DEBUGF(">> tl:%u t:%u ct:%u tr:%u\n pl:%ld pn:%ld pr:%ld\n", (unsigned)time_left, (unsigned)time, (unsigned)currpts, (unsigned)time_right, (long)pos_left, (long)pos_new, (long)pos_right); } else if (currpts > time) { /* Time at current position is past seek time - move backward */ pos_right = sk.pos; time_right = currpts; if (pos_right <= pos_left) break; /* If the window disappeared - we're done */ pos_new = muldiv_uint32(time - time_left, pos_right - pos_left, time_right - time_left); /* Overshot the seek point - fudge estimate a bit low */ pos_adj = pos_new / 10; if (pos_adj > 512*1024) pos_adj = 512*1024; pos_new += pos_left - pos_adj; state = STATE3; /* Last scan was late */ sk.dir = SSCAN_REVERSE; DEBUGF("<< tl:%u t:%u ct:%u tr:%u\n pl:%ld pn:%ld pr:%ld\n", (unsigned)time_left, (unsigned)time, (unsigned)currpts, (unsigned)time_right, (long)pos_left, (long)pos_new, (long)pos_right); } else { /* Exact match - it happens */ DEBUGF("|| tl:%u t:%u ct:%u tr:%u\n pl:%ld pn:%ld pr:%ld\n", (unsigned)time_left, (unsigned)time, (unsigned)currpts, (unsigned)time_right, (long)pos_left, (long)pos_new, (long)pos_right); pts = currpts; pos = sk.pos; state = STATE9; } } else { /* Nothing found */ switch (state) { case STATE1: /* We already tried the bruteforce scan and failed again - no * more stamps could possibly exist in the interval */ DEBUGF("!! no timestamp 2x\n"); break; case STATE0: /* Hardly likely except at very beginning - just do L->R scan * to find something */ DEBUGF("!! no timestamp on first probe: %ld\n", sk.pos); case STATE2: case STATE3: /* Could just be missing timestamps because the interval is * narrowing down. A large block of data from another stream * may also be in the midst of our chosen points which could * cluster at either extreme end. If anything is there, this * will find it. */ pos_new = pos_left; sk.dir = SSCAN_FORWARD; DEBUGF("?? tl:%u t:%u ct:%u tr:%u\n pl:%ld pn:%ld pr:%ld\n", (unsigned)time_left, (unsigned)time, (unsigned)currpts, (unsigned)time_right, (long)pos_left, (long)pos_new, (long)pos_right); state = STATE1; break; default: DEBUGF("?? Invalid state: %d\n", state); } } /* Same timestamp twice = quit */ if (currpts == prevpts) { DEBUGF("!! currpts == prevpts (stop)\n"); state = STATE9; } prevpts = currpts; } #if defined(DEBUG) || defined(SIMULATOR) /* The next pts after the seeked-to position should be greater - * most of the time - frames out of presentation order may muck it * up a slight bit */ sk.pos = pos + 1; sk.len = disk_buf.filesize; sk.dir = SSCAN_FORWARD; uint32_t nextpts = mpeg_parser_scan_pts(&sk, id); DEBUGF("Seek pos:%ld pts:%u t:%u next pts:%u \n", (long)pos, (unsigned)pts, (unsigned)time, (unsigned)nextpts); if (pts <= time && time < nextpts) { /* Smile - it worked */ DEBUGF(" :) pts<=time time) { /* Hmm */ DEBUGF(" :\\ pts>time\n"); } if (pts >= nextpts) { /* Weird - probably because of encoded order & tends to be right * anyway if other criteria are met */ DEBUGF(" :p pts>=next pts\n"); } if (time >= nextpts) { /* Ugh */ DEBUGF(" :( time>=nextpts\n"); } } #endif return pos; } static void prepare_audio(uint32_t time) { off_t pos; if (!str_send_msg(&audio_str, STREAM_NEEDS_SYNC, time)) { DEBUGF("Audio was ready\n"); return; } pos = mpeg_parser_seek_PTS(time, audio_str.id); str_send_msg(&audio_str, STREAM_RESET, 0); str_parser.parms.sd.time = time; str_parser.parms.sd.sk.pos = pos; str_parser.parms.sd.sk.len = 1024*1024; str_parser.parms.sd.sk.dir = SSCAN_FORWARD; str_send_msg(&audio_str, STREAM_SYNC, (intptr_t)&str_parser.parms.sd); } /* This function demuxes the streams and gives the next stream data * pointer. * * STREAM_PM_STREAMING is for operation during playback. If the nescessary * data and worst-case lookahead margin is not available, the stream is * registered for notification when the data becomes available. If parsing * extends beyond the end of the file or the end of stream marker is reached, * STREAM_DATA_END is returned and the stream state changed to SSTATE_EOS. * * STREAM_PM_RANDOM_ACCESS is for operation when not playing such as seeking. * If the file cache misses for the current position + lookahead, it will be * loaded from disk. When the specified limit is reached, STREAM_DATA_END is * returned. * * The results from one mode may be used as input to the other. Random access * requires cooperation amongst threads to avoid evicting another stream's * data. */ static int parse_demux(struct stream *str, enum stream_parse_mode type) { #define INC_BUF(offset) \ ({ off_t _o = (offset); \ str->hdr.win_right += _o; \ if ((p += _o) >= disk_buf.end) \ p -= disk_buf.size; }) static const int mpeg1_skip_table[16] = { 0, 0, 4, 9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; uint8_t *p = str->curr_packet_end; str->pkt_flags = 0; while (1) { uint8_t *header; unsigned id; ssize_t length, bytes; switch (type) { case STREAM_PM_STREAMING: /* Has the end been reached already? */ switch (str->state) { case SSTATE_PARSE: /* Expected case first if no jumptable */ /* Are we at the end of file? */ if (str->hdr.win_left < disk_buf.filesize) break; str_end_of_stream(str); return STREAM_DATA_END; case SSTATE_SYNC: /* Is sync at the end of file? */ if (str->hdr.win_right < disk_buf.filesize) break; str_end_of_stream(str); /* Fall-through */ case SSTATE_END: return STREAM_DATA_END; } if (!disk_buf_is_data_ready(&str->hdr, MIN_BUFAHEAD)) { /* This data range is not buffered yet - register stream to * be notified when it becomes available. Stream is obliged * to enter a TSTATE_DATA state if it must wait. */ int res = str_next_data_not_ready(str); if (res != STREAM_OK) return res; } break; /* STREAM_PM_STREAMING: */ case STREAM_PM_RANDOM_ACCESS: str->hdr.pos = disk_buf_lseek(str->hdr.pos, SEEK_SET); if (str->hdr.pos < 0 || str->hdr.pos >= str->hdr.limit || disk_buf_getbuffer(MIN_BUFAHEAD, &p, NULL, NULL) <= 0) { str_end_of_stream(str); return STREAM_DATA_END; } str->state = SSTATE_SYNC; str->hdr.win_left = str->hdr.pos; str->curr_packet = NULL; str->curr_packet_end = p; break; /* STREAM_PM_RANDOM_ACCESS: */ } if (str->state == SSTATE_SYNC) { /* Scanning for start code */ if (!CMP_3_CONST(p, PACKET_START_CODE_PREFIX)) { INC_BUF(1); continue; } } /* Found a start code - enter parse state */ str->state = SSTATE_PARSE; /* Pack header, skip it */ if (CMP_4_CONST(p, PACK_START_CODE)) { /* Max lookahead: 14 */ if ((p[4] & 0xc0) == 0x40) /* mpeg-2 */ { /* Max delta: 14 + 7 = 21 */ /* Skip pack header and any stuffing bytes*/ bytes = 14 + (p[13] & 7); } else if ((p[4] & 0xf0) == 0x20) /* mpeg-1 */ { bytes = 12; } else /* unknown - skip it */ { DEBUGF("weird pack header!\n"); bytes = 5; } INC_BUF(bytes); } /* System header, parse and skip it - 6 bytes + size */ if (CMP_4_CONST(p, SYSTEM_HEADER_START_CODE)) { /* Skip start code */ /* Max Delta = 65535 + 6 = 65541 */ bytes = 6 + ((p[4] << 8) | p[5]); INC_BUF(bytes); } /* Packet header, parse it */ if (!CMP_3_CONST(p, PACKET_START_CODE_PREFIX)) { /* Problem? Meh...probably not but just a corrupted section. * Try to resync the parser which will probably succeed. */ DEBUGF("packet start code prefix not found: 0x%02x\n" " wl:%lu wr:%lu\n" " p:%p cp:%p cpe:%p\n" " dbs:%p dbe:%p dbt:%p\n", str->id, str->hdr.win_left, str->hdr.win_right, p, str->curr_packet, str->curr_packet_end, disk_buf.start, disk_buf.end, disk_buf.tail); str->state = SSTATE_SYNC; INC_BUF(1); /* Next byte - this one's no good */ continue; } /* We retrieve basic infos */ /* Maximum packet length: 6 + 65535 = 65541 */ id = p[3]; length = ((p[4] << 8) | p[5]) + 6; if (id != str->id) { switch (id) { case MPEG_STREAM_PROGRAM_END: /* end of stream */ str_end_of_stream(str); DEBUGF("MPEG program end: 0x%02x\n", str->id); return STREAM_DATA_END; case MPEG_STREAM_PACK_HEADER: case MPEG_STREAM_SYSTEM_HEADER: /* These shouldn't be here - no increment or resync * since we'll pick it up above. */ continue; default: /* It's not the packet we're looking for, skip it */ INC_BUF(length); continue; } } /* Ok, it's our packet */ header = p; if ((header[6] & 0xc0) == 0x80) /* mpeg2 */ { /* Max Lookahead: 18 */ /* Min length: 9 */ /* Max length: 9 + 255 = 264 */ length = 9 + header[8]; /* header points to the mpeg2 pes header */ if ((header[7] & 0x80) != 0) { /* header has a pts */ uint32_t pts = read_pts(header, 9); if (pts != INVALID_TIMESTAMP) { str->pts = pts; #if 0 /* DTS isn't used for anything since things just get decoded ASAP but keep the code around */ if (STREAM_IS_VIDEO(id)) { /* Video stream - header may have a dts as well */ str->dts = pts; if (header[7] & 0x40) != 0x00) { pts = read_pts(header, 14); if (pts != INVALID_TIMESTAMP) str->dts = pts; } } #endif str->pkt_flags |= PKT_HAS_TS; } } } else /* mpeg1 */ { /* Max lookahead: 24 + 2 + 9 = 35 */ /* Max len_skip: 24 + 2 = 26 */ /* Min length: 7 */ /* Max length: 24 + 2 + 9 = 35 */ off_t len_skip; uint8_t * ptsbuf; length = 7; while (header[length - 1] == 0xff) { if (++length > 23) { DEBUGF("Too much stuffing" ); break; } } if ((header[length - 1] & 0xc0) == 0x40) length += 2; len_skip = length; length += mpeg1_skip_table[header[length - 1] >> 4]; /* Header points to the mpeg1 pes header */ ptsbuf = header + len_skip; if ((ptsbuf[-1] & 0xe0) == 0x20 && TS_CHECK_MARKERS(ptsbuf, -1)) { /* header has a pts */ uint32_t pts = read_pts(ptsbuf, -1); if (pts != INVALID_TIMESTAMP) { str->pts = pts; #if 0 /* DTS isn't used for anything since things just get decoded ASAP but keep the code around */ if (STREAM_IS_VIDEO(id)) { /* Video stream - header may have a dts as well */ str->dts = pts; if (ptsbuf[-1] & 0xf0) == 0x30) { pts = read_pts(ptsbuf, 4); if (pts != INVALID_TIMESTAMP) str->dts = pts; } } #endif str->pkt_flags |= PKT_HAS_TS; } } } p += length; /* Max bytes: 6 + 65535 - 7 = 65534 */ bytes = 6 + (header[4] << 8) + header[5] - length; str->curr_packet = p; str->curr_packet_end = p + bytes; str->hdr.win_left = str->hdr.win_right + length; str->hdr.win_right = str->hdr.win_left + bytes; if (str->hdr.win_right > disk_buf.filesize) { /* No packet that exceeds end of file can be valid */ str_end_of_stream(str); return STREAM_DATA_END; } return STREAM_OK; } /* end while */ #undef INC_BUF } /* This simply reads data from the file one page at a time and returns a * pointer to it in the buffer. */ static int parse_elementary(struct stream *str, enum stream_parse_mode type) { uint8_t *p; ssize_t len = 0; str->pkt_flags = 0; switch (type) { case STREAM_PM_STREAMING: /* Has the end been reached already? */ if (str->state == SSTATE_END) return STREAM_DATA_END; /* Are we at the end of file? */ if (str->hdr.win_left >= disk_buf.filesize) { str_end_of_stream(str); return STREAM_DATA_END; } if (!disk_buf_is_data_ready(&str->hdr, MIN_BUFAHEAD)) { /* This data range is not buffered yet - register stream to * be notified when it becomes available. Stream is obliged * to enter a TSTATE_DATA state if it must wait. */ int res = str_next_data_not_ready(str); if (res != STREAM_OK) return res; } len = DISK_BUF_PAGE_SIZE; if ((size_t)(str->hdr.win_right + len) > (size_t)disk_buf.filesize) len = disk_buf.filesize - str->hdr.win_right; if (len <= 0) { str_end_of_stream(str); return STREAM_DATA_END; } p = str->curr_packet_end; if (p >= disk_buf.end) p -= disk_buf.size; break; /* STREAM_PM_STREAMING: */ case STREAM_PM_RANDOM_ACCESS: str->hdr.pos = disk_buf_lseek(str->hdr.pos, SEEK_SET); len = disk_buf_getbuffer(DISK_BUF_PAGE_SIZE, &p, NULL, NULL); if (len <= 0 || str->hdr.pos < 0 || str->hdr.pos >= str->hdr.limit) { str_end_of_stream(str); return STREAM_DATA_END; } break; /* STREAM_PM_RANDOM_ACCESS: */ } str->state = SSTATE_PARSE; str->curr_packet = p; str->curr_packet_end = p + len; str->hdr.win_left = str->hdr.win_right; str->hdr.win_right = str->hdr.win_left + len; return STREAM_OK; } bool parser_prepare_image(uint32_t time) { struct stream_scan sk; int tries; int result; stream_scan_init(&sk); if (!str_send_msg(&video_str, STREAM_NEEDS_SYNC, time)) { DEBUGF("Image was ready\n"); return true; /* Should already have the image */ } #ifdef HAVE_ADJUSTABLE_CPU_FREQ rb->cpu_boost(true); /* No interference with trigger_cpu_boost */ #endif str_send_msg(&video_str, STREAM_RESET, 0); sk.pos = parser_can_seek() ? mpeg_parser_seek_PTS(time, video_str.id) : 0; sk.len = sk.pos; sk.dir = SSCAN_REVERSE; tries = 1; try_again: if (mpeg_parser_scan_start_code(&sk, MPEG_START_GOP)) { DEBUGF("GOP found at: %ld\n", sk.pos); unsigned id = mpeg_parser_scan_pes(&sk); if (id != video_str.id && sk.pos > 0) { /* Not part of our stream */ DEBUGF(" wrong stream: 0x%02x\n", id); goto try_again; } /* This will hit the PES header since it's known to be there */ uint32_t pts = mpeg_parser_scan_pts(&sk, id); if (pts == INVALID_TIMESTAMP || pts > time) { DEBUGF(" wrong timestamp: %u\n", (unsigned)pts); goto try_again; } } str_parser.parms.sd.time = time; str_parser.parms.sd.sk.pos = MAX(sk.pos, 0); str_parser.parms.sd.sk.len = 1024*1024; str_parser.parms.sd.sk.dir = SSCAN_FORWARD; DEBUGF("thumb pos:%ld len:%ld\n", str_parser.parms.sd.sk.pos, (long)str_parser.parms.sd.sk.len); result = str_send_msg(&video_str, STREAM_SYNC, (intptr_t)&str_parser.parms.sd); if (result != STREAM_PERFECT_MATCH) { /* Two tries should be all that is nescessary to find the exact frame * if the first GOP actually started later than the timestamp - the * GOP just prior must then start on or earlier. */ if (++tries <= 2) goto try_again; } #ifdef HAVE_ADJUSTABLE_CPU_FREQ rb->cpu_boost(false); #endif return result > STREAM_OK; } /* Seek parser to the specified time and return absolute time. * No actual hard stuff is performed here. That's done when streaming is * about to begin or something from the current position is requested */ uint32_t parser_seek_time(uint32_t time) { if (!parser_can_seek()) time = 0; else if (time > str_parser.duration) time = str_parser.duration; str_parser.last_seek_time = time + str_parser.start_pts; return str_parser.last_seek_time; } void parser_prepare_streaming(void) { struct stream_window sw; DEBUGF("parser_prepare_streaming\n"); /* Prepare initial video frame */ parser_prepare_image(str_parser.last_seek_time); /* Sync audio stream */ if (audio_str.start_pts != INVALID_TIMESTAMP) prepare_audio(str_parser.last_seek_time); /* Prequeue some data and set buffer window */ if (!stream_get_window(&sw)) sw.left = sw.right = disk_buf.filesize; DEBUGF(" swl:%ld swr:%ld\n", sw.left, sw.right); if (sw.right > disk_buf.filesize - 4*MIN_BUFAHEAD) sw.right = disk_buf.filesize - 4*MIN_BUFAHEAD; disk_buf_prepare_streaming(sw.left, sw.right - sw.left + 4*MIN_BUFAHEAD); } int parser_init_stream(void) { if (disk_buf.in_file < 0) return STREAM_ERROR; /* TODO: Actually find which streams are available */ audio_str.id = MPEG_STREAM_AUDIO_FIRST; video_str.id = MPEG_STREAM_VIDEO_FIRST; /* Try to pull a video PES - if not found, try video init anyway which * should succeed if it really is a video-only stream */ video_str.hdr.pos = 0; video_str.hdr.limit = 256*1024; if (parse_demux(&video_str, STREAM_PM_RANDOM_ACCESS) == STREAM_OK) { /* Found a video packet - assume program stream */ str_parser.format = STREAM_FMT_MPEG_PS; str_parser.next_data = parse_demux; } else { /* No PES element found - assume video elementary stream */ str_parser.format = STREAM_FMT_MPV; str_parser.next_data = parse_elementary; } if (!init_video_info()) { /* Cannot determine video size, etc. */ parser_init_state(); return STREAM_UNSUPPORTED; } if (str_parser.format == STREAM_FMT_MPEG_PS) { /* Initalize start_pts and end_pts with the length (in 45kHz units) of * the movie. INVALID_TIMESTAMP if the time could not be determined */ if (!init_times(&video_str) || !check_times(&video_str)) { /* Must have video at least */ parser_init_state(); return STREAM_UNSUPPORTED; } str_parser.flags |= STREAMF_CAN_SEEK; if (init_times(&audio_str)) { /* Audio will be part of playback pool */ stream_add_stream(&audio_str); if (check_times(&audio_str)) { /* Overall duration is maximum span */ str_parser.start_pts = MIN(audio_str.start_pts, video_str.start_pts); str_parser.end_pts = MAX(audio_str.end_pts, video_str.end_pts); } else { /* Bad times on audio - use video times */ str_parser.start_pts = video_str.start_pts; str_parser.end_pts = video_str.end_pts; /* Questionable: could use bitrate seek and match video to that */ audio_str.start_pts = video_str.start_pts; audio_str.end_pts = video_str.end_pts; } } else { /* No audio stream - use video only */ str_parser.start_pts = video_str.start_pts; str_parser.end_pts = video_str.end_pts; } str_parser.last_seek_time = str_parser.start_pts; } else { /* There's no way to handle times on this without a full file * scan */ audio_str.start_pts = INVALID_TIMESTAMP; audio_str.end_pts = INVALID_TIMESTAMP; video_str.start_pts = 0; video_str.end_pts = INVALID_TIMESTAMP; str_parser.start_pts = 0; str_parser.end_pts = INVALID_TIMESTAMP; } /* Add video to playback pool */ stream_add_stream(&video_str); /* Cache duration - it's used very often */ str_parser.duration = str_parser.end_pts - str_parser.start_pts; DEBUGF("Movie info:\n" " size:%dx%d\n" " start:%u\n" " end:%u\n" " duration:%u\n", str_parser.dims.w, str_parser.dims.h, (unsigned)str_parser.start_pts, (unsigned)str_parser.end_pts, (unsigned)str_parser.duration); return STREAM_OK; } void parser_close_stream(void) { stream_remove_streams(); parser_init_state(); } bool parser_init(void) { parser_init_state(); return true; } 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 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/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003-2004 M. Bakker, Ahead Software AG, http://www.nero.com
**  
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
** 
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
** 
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software 
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
**
** $Id$
**/

/*
   Reads the AAC bitstream as defined in 14496-3 (MPEG-4 Audio)
*/

#include "common.h"
#include "structs.h"

#include <stdlib.h>
#include <string.h>

#include "decoder.h"
#include "syntax.h"
#include "specrec.h"
#include "huffman.h"
#include "bits.h"
#include "pulse.h"
#include "analysis.h"
#include "drc.h"
#ifdef ERROR_RESILIENCE
#include "rvlc.h"
#endif
#ifdef SBR_DEC
#include "sbr_syntax.h"
#endif


/* static function declarations */
static void decode_sce_lfe(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo, bitfile *ld,
                           uint8_t id_syn_ele);
static void decode_cpe(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo, bitfile *ld,
                       uint8_t id_syn_ele);
static uint8_t single_lfe_channel_element(NeAACDecHandle hDecoder, bitfile *ld,
                                          uint8_t channel, uint8_t *tag);
static uint8_t channel_pair_element(NeAACDecHandle hDecoder, bitfile *ld,
                                    uint8_t channel, uint8_t *tag);
#ifdef COUPLING_DEC
static uint8_t coupling_channel_element(NeAACDecHandle hDecoder, bitfile *ld);
#endif
static uint16_t data_stream_element(NeAACDecHandle hDecoder, bitfile *ld);
static uint8_t program_config_element(program_config *pce, bitfile *ld);
static uint8_t fill_element(NeAACDecHandle hDecoder, bitfile *ld, drc_info *drc
#ifdef SBR_DEC
                            ,uint8_t sbr_ele
#endif
                            );
static uint8_t individual_channel_stream(NeAACDecHandle hDecoder, element *ele,
                                         bitfile *ld, ic_stream *ics, uint8_t scal_flag,
                                         int16_t *spec_data);
static uint8_t ics_info(NeAACDecHandle hDecoder, ic_stream *ics, bitfile *ld,
                        uint8_t common_window);
static uint8_t section_data(NeAACDecHandle hDecoder, ic_stream *ics, bitfile *ld);
static uint8_t scale_factor_data(NeAACDecHandle hDecoder, ic_stream *ics, bitfile *ld);
#ifdef SSR_DEC
static void gain_control_data(bitfile *ld, ic_stream *ics);
#endif
static uint8_t spectral_data(NeAACDecHandle hDecoder, ic_stream *ics, bitfile *ld,
                             int16_t *spectral_data);
static uint16_t extension_payload(bitfile *ld, drc_info *drc, uint16_t count);
static uint8_t pulse_data(ic_stream *ics, pulse_info *pul, bitfile *ld);
static void tns_data(ic_stream *ics, tns_info *tns, bitfile *ld);
#ifdef LTP_DEC
static uint8_t ltp_data(NeAACDecHandle hDecoder, ic_stream *ics, ltp_info *ltp, bitfile *ld);
#endif
static uint8_t adts_fixed_header(adts_header *adts, bitfile *ld);
static void adts_variable_header(adts_header *adts, bitfile *ld);
static void adts_error_check(adts_header *adts, bitfile *ld);
static uint8_t dynamic_range_info(bitfile *ld, drc_info *drc);
static uint8_t excluded_channels(bitfile *ld, drc_info *drc);
#ifdef SCALABLE_DEC
static int8_t aac_scalable_main_header(NeAACDecHandle hDecoder, ic_stream *ics1, ic_stream *ics2,
                                       bitfile *ld, uint8_t this_layer_stereo);
#endif


/* Table 4.4.1 */
int8_t GASpecificConfig(bitfile *ld, mp4AudioSpecificConfig *mp4ASC,
                        program_config *pce_out)
{
    program_config pce;

    /* 1024 or 960 */
    mp4ASC->frameLengthFlag = faad_get1bit(ld
        DEBUGVAR(1,138,"GASpecificConfig(): FrameLengthFlag"));
#ifndef ALLOW_SMALL_FRAMELENGTH
    if (mp4ASC->frameLengthFlag == 1)
        return -3;
#endif

    mp4ASC->dependsOnCoreCoder = faad_get1bit(ld
        DEBUGVAR(1,139,"GASpecificConfig(): DependsOnCoreCoder"));
    if (mp4ASC->dependsOnCoreCoder == 1)
    {
        mp4ASC->coreCoderDelay = (uint16_t)faad_getbits(ld, 14
            DEBUGVAR(1,140,"GASpecificConfig(): CoreCoderDelay"));
    }

    mp4ASC->extensionFlag = faad_get1bit(ld DEBUGVAR(1,141,"GASpecificConfig(): ExtensionFlag"));
    if (mp4ASC->channelsConfiguration == 0)
    {
        if (program_config_element(&pce, ld))
            return -3;
        //mp4ASC->channelsConfiguration = pce.channels;

        if (pce_out != NULL)
            memcpy(pce_out, &pce, sizeof(program_config));

        /*
        if (pce.num_valid_cc_elements)
            return -3;
        */
    }

#ifdef ERROR_RESILIENCE
    if (mp4ASC->extensionFlag == 1)
    {
        /* Error resilience not supported yet */
        if (mp4ASC->objectTypeIndex >= ER_OBJECT_START)
        {
            mp4ASC->aacSectionDataResilienceFlag = faad_get1bit(ld
                DEBUGVAR(1,144,"GASpecificConfig(): aacSectionDataResilienceFlag"));
            mp4ASC->aacScalefactorDataResilienceFlag = faad_get1bit(ld
                DEBUGVAR(1,145,"GASpecificConfig(): aacScalefactorDataResilienceFlag"));
            mp4ASC->aacSpectralDataResilienceFlag = faad_get1bit(ld
                DEBUGVAR(1,146,"GASpecificConfig(): aacSpectralDataResilienceFlag"));

            /* 1 bit: extensionFlag3 */
        }
    }
#endif

    return 0;
}

/* Table 4.4.2 */
/* An MPEG-4 Audio decoder is only required to follow the Program
   Configuration Element in GASpecificConfig(). The decoder shall ignore
   any Program Configuration Elements that may occur in raw data blocks.
   PCEs transmitted in raw data blocks cannot be used to convey decoder
   configuration information.
*/
static uint8_t program_config_element(program_config *pce, bitfile *ld)
{
    uint8_t i;

    memset(pce, 0, sizeof(program_config));

    pce->channels = 0;

    pce->element_instance_tag = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,10,"program_config_element(): element_instance_tag"));

    pce->object_type = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,11,"program_config_element(): object_type"));
    pce->sf_index = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,12,"program_config_element(): sf_index"));
    pce->num_front_channel_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,13,"program_config_element(): num_front_channel_elements"));
    pce->num_side_channel_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,14,"program_config_element(): num_side_channel_elements"));
    pce->num_back_channel_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,15,"program_config_element(): num_back_channel_elements"));
    pce->num_lfe_channel_elements = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,16,"program_config_element(): num_lfe_channel_elements"));
    pce->num_assoc_data_elements = (uint8_t)faad_getbits(ld, 3
        DEBUGVAR(1,17,"program_config_element(): num_assoc_data_elements"));
    pce->num_valid_cc_elements = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,18,"program_config_element(): num_valid_cc_elements"));

    pce->mono_mixdown_present = faad_get1bit(ld
        DEBUGVAR(1,19,"program_config_element(): mono_mixdown_present"));
    if (pce->mono_mixdown_present == 1)
    {
        pce->mono_mixdown_element_number = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,20,"program_config_element(): mono_mixdown_element_number"));
    }

    pce->stereo_mixdown_present = faad_get1bit(ld
        DEBUGVAR(1,21,"program_config_element(): stereo_mixdown_present"));
    if (pce->stereo_mixdown_present == 1)
    {
        pce->stereo_mixdown_element_number = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,22,"program_config_element(): stereo_mixdown_element_number"));
    }

    pce->matrix_mixdown_idx_present = faad_get1bit(ld
        DEBUGVAR(1,23,"program_config_element(): matrix_mixdown_idx_present"));
    if (pce->matrix_mixdown_idx_present == 1)
    {
        pce->matrix_mixdown_idx = (uint8_t)faad_getbits(ld, 2
            DEBUGVAR(1,24,"program_config_element(): matrix_mixdown_idx"));
        pce->pseudo_surround_enable = faad_get1bit(ld
            DEBUGVAR(1,25,"program_config_element(): pseudo_surround_enable"));
    }

    for (i = 0; i < pce->num_front_channel_elements; i++)
    {
        pce->front_element_is_cpe[i] = faad_get1bit(ld
            DEBUGVAR(1,26,"program_config_element(): front_element_is_cpe"));
        pce->front_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,27,"program_config_element(): front_element_tag_select"));

        if (pce->front_element_is_cpe[i] & 1)
        {
            pce->cpe_channel[pce->front_element_tag_select[i]] = pce->channels;
            pce->num_front_channels += 2;
            pce->channels += 2;
        } else {
            pce->sce_channel[pce->front_element_tag_select[i]] = pce->channels;
            pce->num_front_channels++;
            pce->channels++;
        }
    }

    for (i = 0; i < pce->num_side_channel_elements; i++)
    {
        pce->side_element_is_cpe[i] = faad_get1bit(ld
            DEBUGVAR(1,28,"program_config_element(): side_element_is_cpe"));
        pce->side_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,29,"program_config_element(): side_element_tag_select"));

        if (pce->side_element_is_cpe[i] & 1)
        {
            pce->cpe_channel[pce->side_element_tag_select[i]] = pce->channels;
            pce->num_side_channels += 2;
            pce->channels += 2;
        } else {
            pce->sce_channel[pce->side_element_tag_select[i]] = pce->channels;
            pce->num_side_channels++;
            pce->channels++;
        }
    }

    for (i = 0; i < pce->num_back_channel_elements; i++)
    {
        pce->back_element_is_cpe[i] = faad_get1bit(ld
            DEBUGVAR(1,30,"program_config_element(): back_element_is_cpe"));
        pce->back_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,31,"program_config_element(): back_element_tag_select"));

        if (pce->back_element_is_cpe[i] & 1)
        {
            pce->cpe_channel[pce->back_element_tag_select[i]] = pce->channels;
            pce->channels += 2;
            pce->num_back_channels += 2;
        } else {
            pce->sce_channel[pce->back_element_tag_select[i]] = pce->channels;
            pce->num_back_channels++;
            pce->channels++;
        }
    }

    for (i = 0; i < pce->num_lfe_channel_elements; i++)
    {
        pce->lfe_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,32,"program_config_element(): lfe_element_tag_select"));

        pce->sce_channel[pce->lfe_element_tag_select[i]] = pce->channels;
        pce->num_lfe_channels++;
        pce->channels++;
    }

    for (i = 0; i < pce->num_assoc_data_elements; i++)
        pce->assoc_data_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
        DEBUGVAR(1,33,"program_config_element(): assoc_data_element_tag_select"));

    for (i = 0; i < pce->num_valid_cc_elements; i++)
    {
        pce->cc_element_is_ind_sw[i] = faad_get1bit(ld
            DEBUGVAR(1,34,"program_config_element(): cc_element_is_ind_sw"));
        pce->valid_cc_element_tag_select[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,35,"program_config_element(): valid_cc_element_tag_select"));
    }

    faad_byte_align(ld);

    pce->comment_field_bytes = (uint8_t)faad_getbits(ld, 8
        DEBUGVAR(1,36,"program_config_element(): comment_field_bytes"));

    for (i = 0; i < pce->comment_field_bytes; i++)
    {
        pce->comment_field_data[i] = (uint8_t)faad_getbits(ld, 8
            DEBUGVAR(1,37,"program_config_element(): comment_field_data"));
    }
    pce->comment_field_data[i] = 0;

    if (pce->channels > MAX_CHANNELS)
        return 22;

    return 0;
}

static void decode_sce_lfe(NeAACDecHandle hDecoder,
                           NeAACDecFrameInfo *hInfo, bitfile *ld,
                           uint8_t id_syn_ele)
{
    uint8_t channels = hDecoder->fr_channels;
    uint8_t tag = 0;

    if (channels+1 > MAX_CHANNELS)
    {
        hInfo->error = 12;
        return;
    }
    if (hDecoder->fr_ch_ele+1 > MAX_SYNTAX_ELEMENTS)
    {
        hInfo->error = 13;
        return;
    }

    /* for SCE hDecoder->element_output_channels[] is not set here because this
       can become 2 when some form of Parametric Stereo coding is used
    */

    /* save the syntax element id */
    hDecoder->element_id[hDecoder->fr_ch_ele] = id_syn_ele;

    /* decode the element */
    hInfo->error = single_lfe_channel_element(hDecoder, ld, channels, &tag);

    /* map output channels position to internal data channels */
    if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 2)
    {
        /* this might be faulty when pce_set is true */
        hDecoder->internal_channel[channels] = channels;
        hDecoder->internal_channel[channels+1] = channels+1;
    } else {
        if (hDecoder->pce_set)
            hDecoder->internal_channel[hDecoder->pce.sce_channel[tag]] = channels;
        else
            hDecoder->internal_channel[channels] = channels;
    }

    hDecoder->fr_channels += hDecoder->element_output_channels[hDecoder->fr_ch_ele];
    hDecoder->fr_ch_ele++;
}

static void decode_cpe(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo, bitfile *ld,
                       uint8_t id_syn_ele)
{
    uint8_t channels = hDecoder->fr_channels;
    uint8_t tag = 0;

    if (channels+2 > MAX_CHANNELS)
    {
        hInfo->error = 12;
        return;
    }
    if (hDecoder->fr_ch_ele+1 > MAX_SYNTAX_ELEMENTS)
    {
        hInfo->error = 13;
        return;
    }

    /* for CPE the number of output channels is always 2 */
    if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 0)
    {
        /* element_output_channels not set yet */
        hDecoder->element_output_channels[hDecoder->fr_ch_ele] = 2;
    } else if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] != 2) {
        /* element inconsistency */
        hInfo->error = 21;
        return;
    }

    /* save the syntax element id */
    hDecoder->element_id[hDecoder->fr_ch_ele] = id_syn_ele;

    /* decode the element */
    hInfo->error = channel_pair_element(hDecoder, ld, channels, &tag);

    /* map output channel position to internal data channels */
    if (hDecoder->pce_set)
    {
        hDecoder->internal_channel[hDecoder->pce.cpe_channel[tag]] = channels;
        hDecoder->internal_channel[hDecoder->pce.cpe_channel[tag]+1] = channels+1;
    } else {
        hDecoder->internal_channel[channels] = channels;
        hDecoder->internal_channel[channels+1] = channels+1;
    }

    hDecoder->fr_channels += 2;
    hDecoder->fr_ch_ele++;
}

void raw_data_block(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo,
                    bitfile *ld, program_config *pce, drc_info *drc)
{
    uint8_t id_syn_ele;

    hDecoder->fr_channels = 0;
    hDecoder->fr_ch_ele = 0;
    hDecoder->first_syn_ele = 25;
    hDecoder->has_lfe = 0;

#ifdef ERROR_RESILIENCE
    if (hDecoder->object_type < ER_OBJECT_START)
    {
#endif
        /* Table 4.4.3: raw_data_block() */
        while ((id_syn_ele = (uint8_t)faad_getbits(ld, LEN_SE_ID
            DEBUGVAR(1,4,"NeAACDecDecode(): id_syn_ele"))) != ID_END)
        {
            switch (id_syn_ele) {
            case ID_SCE:
                if (hDecoder->first_syn_ele == 25) hDecoder->first_syn_ele = id_syn_ele;
                decode_sce_lfe(hDecoder, hInfo, ld, id_syn_ele);
                if (hInfo->error > 0)
                    return;
                break;
            case ID_CPE:
                if (hDecoder->first_syn_ele == 25) hDecoder->first_syn_ele = id_syn_ele;
                decode_cpe(hDecoder, hInfo, ld, id_syn_ele);
                if (hInfo->error > 0)
                    return;
                break;
            case ID_LFE:
                hDecoder->has_lfe++;
                decode_sce_lfe(hDecoder, hInfo, ld, id_syn_ele);
                if (hInfo->error > 0)
                    return;
                break;
            case ID_CCE: /* not implemented yet, but skip the bits */
#ifdef COUPLING_DEC
                hInfo->error = coupling_channel_element(hDecoder, ld);
#else
                hInfo->error = 6;
#endif
                if (hInfo->error > 0)
                    return;
                break;
            case ID_DSE:
                data_stream_element(hDecoder, ld);
                break;
            case ID_PCE:
                /* 14496-4: 5.6.4.1.2.1.3: */
                /* program_configuration_element()'s in access units shall be ignored */
                program_config_element(pce, ld);
                //if ((hInfo->error = program_config_element(pce, ld)) > 0)
                //    return;
                //hDecoder->pce_set = 1;
                break;
            case ID_FIL:
                /* one sbr_info describes a channel_element not a channel! */
                /* if we encounter SBR data here: error */
                /* SBR data will be read directly in the SCE/LFE/CPE element */
                if ((hInfo->error = fill_element(hDecoder, ld, drc
#ifdef SBR_DEC
                    , INVALID_SBR_ELEMENT
#endif
                    )) > 0)
                    return;
                break;
            }
        }
#ifdef ERROR_RESILIENCE
    } else {
        /* Table 262: er_raw_data_block() */
        switch (hDecoder->channelConfiguration)
        {
        case 1:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            if (hInfo->error > 0)
                return;
            break;
        case 2:
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            if (hInfo->error > 0)
                return;
            break;
        case 3:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            if (hInfo->error > 0)
                return;
            break;
        case 4:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            if (hInfo->error > 0)
                return;
            break;
        case 5:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            if (hInfo->error > 0)
                return;
            break;
        case 6:
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_sce_lfe(hDecoder, hInfo, ld, ID_LFE);
            if (hInfo->error > 0)
                return;
            break;
        case 7: /* 8 channels */
            decode_sce_lfe(hDecoder, hInfo, ld, ID_SCE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_cpe(hDecoder, hInfo, ld, ID_CPE);
            decode_sce_lfe(hDecoder, hInfo, ld, ID_LFE);
            if (hInfo->error > 0)
                return;
            break;
        default:
            hInfo->error = 7;
            return;
        }
#if 0
        cnt = bits_to_decode() / 8;
        while (cnt >= 1)
        {
            cnt -= extension_payload(cnt);
        }
#endif
    }
#endif

    /* new in corrigendum 14496-3:2002 */
#ifdef DRM
    if (hDecoder->object_type != DRM_ER_LC)
#endif
    {
        faad_byte_align(ld);
    }

    return;
}

/* Table 4.4.4 and */
/* Table 4.4.9 */
ALIGN int16_t spec_data[1024] = {0};
element sce;
static uint8_t single_lfe_channel_element(NeAACDecHandle hDecoder, bitfile *ld,
                                          uint8_t channel, uint8_t *tag)
{
    uint8_t retval = 0;
    ic_stream *ics = &(sce.ics1);

    memset(spec_data,0,sizeof(spec_data));
    memset(&sce,0,sizeof(sce));
    sce.element_instance_tag = (uint8_t)faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,38,"single_lfe_channel_element(): element_instance_tag"));

    *tag = sce.element_instance_tag;
    sce.channel = channel;
    sce.paired_channel = -1;

    retval = individual_channel_stream(hDecoder, &sce, ld, ics, 0, spec_data);
    if (retval > 0)
        return retval;

#ifdef SBR_DEC
    /* check if next bitstream element is a fill element */
    /* if so, read it now so SBR decoding can be done in case of a file with SBR */
    if (faad_showbits(ld, LEN_SE_ID) == ID_FIL)
    {
        faad_flushbits(ld, LEN_SE_ID);

        /* one sbr_info describes a channel_element not a channel! */
        if ((retval = fill_element(hDecoder, ld, hDecoder->drc, hDecoder->fr_ch_ele)) > 0)
        {
            return retval;
        }
    }
#endif

    /* noiseless coding is done, spectral reconstruction is done now */
    retval = reconstruct_single_channel(hDecoder, ics, &sce, spec_data);
    if (retval > 0)
        return retval;

    return 0;
}

/* Table 4.4.5 */
ALIGN int16_t spec_data1[1024] IBSS_ATTR;
ALIGN int16_t spec_data2[1024] IBSS_ATTR;
element cpe;
static uint8_t channel_pair_element(NeAACDecHandle hDecoder, bitfile *ld,
                                    uint8_t channels, uint8_t *tag)
{
    ic_stream *ics1 = &(cpe.ics1);
    ic_stream *ics2 = &(cpe.ics2);
    uint8_t result;

    memset(spec_data1,0,sizeof(spec_data1));
    memset(spec_data2,0,sizeof(spec_data2));
    memset(&cpe,0,sizeof(cpe));
    cpe.channel        = channels;
    cpe.paired_channel = channels+1;

    cpe.element_instance_tag = (uint8_t)faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,39,"channel_pair_element(): element_instance_tag"));
    *tag = cpe.element_instance_tag;

    if ((cpe.common_window = faad_get1bit(ld
        DEBUGVAR(1,40,"channel_pair_element(): common_window"))) & 1)
    {
        /* both channels have common ics information */
        if ((result = ics_info(hDecoder, ics1, ld, cpe.common_window)) > 0)
            return result;

        ics1->ms_mask_present = (uint8_t)faad_getbits(ld, 2
            DEBUGVAR(1,41,"channel_pair_element(): ms_mask_present"));
        if (ics1->ms_mask_present == 1)
        {
            uint8_t g, sfb;
            for (g = 0; g < ics1->num_window_groups; g++)
            {
                for (sfb = 0; sfb < ics1->max_sfb; sfb++)
                {
                    ics1->ms_used[g][sfb] = faad_get1bit(ld
                        DEBUGVAR(1,42,"channel_pair_element(): faad_get1bit"));
                }
            }
        }

#ifdef ERROR_RESILIENCE
        if ((hDecoder->object_type >= ER_OBJECT_START) && (ics1->predictor_data_present))
        {
            if ((
#ifdef LTP_DEC
                ics1->ltp.data_present =
#endif
                faad_get1bit(ld DEBUGVAR(1,50,"channel_pair_element(): ltp.data_present"))) & 1)
            {
#ifdef LTP_DEC
                if ((result = ltp_data(hDecoder, ics1, &(ics1->ltp), ld)) > 0)
                {
                    return result;
                }
#else
                return 26;
#endif
            }
        }
#endif

        memcpy(ics2, ics1, sizeof(ic_stream));
    } else {
        ics1->ms_mask_present = 0;
    }

    if ((result = individual_channel_stream(hDecoder, &cpe, ld, ics1,
        0, spec_data1)) > 0)
    {
        return result;
    }

#ifdef ERROR_RESILIENCE
    if (cpe.common_window && (hDecoder->object_type >= ER_OBJECT_START) &&
        (ics1->predictor_data_present))
    {
        if ((
#ifdef LTP_DEC
            ics1->ltp2.data_present =
#endif
            faad_get1bit(ld DEBUGVAR(1,50,"channel_pair_element(): ltp.data_present"))) & 1)
        {
#ifdef LTP_DEC
            if ((result = ltp_data(hDecoder, ics1, &(ics1->ltp2), ld)) > 0)
            {
                return result;
            }
#else
            return 26;
#endif
        }
    }
#endif

    if ((result = individual_channel_stream(hDecoder, &cpe, ld, ics2,
        0, spec_data2)) > 0)
    {
        return result;
    }

#ifdef SBR_DEC
    /* check if next bitstream element is a fill element */
    /* if so, read it now so SBR decoding can be done in case of a file with SBR */
    if (faad_showbits(ld, LEN_SE_ID) == ID_FIL)
    {
        faad_flushbits(ld, LEN_SE_ID);

        /* one sbr_info describes a channel_element not a channel! */
        if ((result = fill_element(hDecoder, ld, hDecoder->drc, hDecoder->fr_ch_ele)) > 0)
        {
            return result;
        }
    }
#endif

    /* noiseless coding is done, spectral reconstruction is done now */
    if ((result = reconstruct_channel_pair(hDecoder, ics1, ics2, &cpe,
        spec_data1, spec_data2)) > 0)
    {
        return result;
    }

    return 0;
}

/* Table 4.4.6 */
static uint8_t ics_info(NeAACDecHandle hDecoder, ic_stream *ics, bitfile *ld,
                        uint8_t common_window)
{
    uint8_t retval = 0;

    /* ics->ics_reserved_bit = */ faad_get1bit(ld
        DEBUGVAR(1,43,"ics_info(): ics_reserved_bit"));
    ics->window_sequence = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,44,"ics_info(): window_sequence"));
    ics->window_shape = faad_get1bit(ld
        DEBUGVAR(1,45,"ics_info(): window_shape"));

    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
    {
        ics->max_sfb = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,46,"ics_info(): max_sfb (short)"));
        ics->scale_factor_grouping = (uint8_t)faad_getbits(ld, 7
            DEBUGVAR(1,47,"ics_info(): scale_factor_grouping"));
    } else {
        ics->max_sfb = (uint8_t)faad_getbits(ld, 6
            DEBUGVAR(1,48,"ics_info(): max_sfb (long)"));
    }

    /* get the grouping information */
    if ((retval = window_grouping_info(hDecoder, ics)) > 0)
        return retval;

    /* should be an error */
    /* check the range of max_sfb */
    if (ics->max_sfb > ics->num_swb)
        return 16;

    if (ics->window_sequence != EIGHT_SHORT_SEQUENCE)
    {
        if ((ics->predictor_data_present = faad_get1bit(ld
            DEBUGVAR(1,49,"ics_info(): predictor_data_present"))) & 1)
        {
            if (hDecoder->object_type == MAIN) /* MPEG2 style AAC predictor */
            {
                uint8_t sfb;

                uint8_t limit = min(ics->max_sfb, max_pred_sfb(hDecoder->sf_index));
#ifdef MAIN_DEC
                ics->pred.limit = limit;
#endif

                if ((
#ifdef MAIN_DEC
                    ics->pred.predictor_reset =
#endif
                    faad_get1bit(ld DEBUGVAR(1,53,"ics_info(): pred.predictor_reset"))) & 1)
                {
#ifdef MAIN_DEC
                    ics->pred.predictor_reset_group_number =
                        (uint8_t)
#endif
                        faad_getbits(ld, 5 DEBUGVAR(1,54,"ics_info(): pred.predictor_reset_group_number"));
                }

                for (sfb = 0; sfb < limit; sfb++)
                {
#ifdef MAIN_DEC
                    ics->pred.prediction_used[sfb] =
#endif
                        faad_get1bit(ld DEBUGVAR(1,55,"ics_info(): pred.prediction_used"));
                }
            }
#ifdef LTP_DEC
            else { /* Long Term Prediction */
                if (hDecoder->object_type < ER_OBJECT_START)
                {
                    if ((ics->ltp.data_present = faad_get1bit(ld
                        DEBUGVAR(1,50,"ics_info(): ltp.data_present"))) & 1)
                    {
                        if ((retval = ltp_data(hDecoder, ics, &(ics->ltp), ld)) > 0)
                        {
                            return retval;
                        }
                    }
                    if (common_window)
                    {
                        if ((ics->ltp2.data_present = faad_get1bit(ld
                            DEBUGVAR(1,51,"ics_info(): ltp2.data_present"))) & 1)
                        {
                            if ((retval = ltp_data(hDecoder, ics, &(ics->ltp2), ld)) > 0)
                            {
                                return retval;
                            }
                        }
                    }
                }
#ifdef ERROR_RESILIENCE
                if (!common_window && (hDecoder->object_type >= ER_OBJECT_START))
                {
                    if ((ics->ltp.data_present = faad_get1bit(ld
                        DEBUGVAR(1,50,"ics_info(): ltp.data_present"))) & 1)
                    {
                        ltp_data(hDecoder, ics, &(ics->ltp), ld);
                    }
                }
#endif
            }
#else
            (void) common_window;
#endif
        }
    }

    return retval;
}

/* Table 4.4.7 */
static uint8_t pulse_data(ic_stream *ics, pulse_info *pul, bitfile *ld)
{
    uint8_t i;

    pul->number_pulse = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,56,"pulse_data(): number_pulse"));
    pul->pulse_start_sfb = (uint8_t)faad_getbits(ld, 6
        DEBUGVAR(1,57,"pulse_data(): pulse_start_sfb"));

    /* check the range of pulse_start_sfb */
    if (pul->pulse_start_sfb > ics->num_swb)
        return 16;

    for (i = 0; i < pul->number_pulse+1; i++)
    {
        pul->pulse_offset[i] = (uint8_t)faad_getbits(ld, 5
            DEBUGVAR(1,58,"pulse_data(): pulse_offset"));
#if 0
        printf("%d\n", pul->pulse_offset[i]);
#endif
        pul->pulse_amp[i] = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,59,"pulse_data(): pulse_amp"));
#if 0
        printf("%d\n", pul->pulse_amp[i]);
#endif
    }

    return 0;
}

#ifdef COUPLING_DEC
/* Table 4.4.8: Currently just for skipping the bits... */
static uint8_t coupling_channel_element(NeAACDecHandle hDecoder, bitfile *ld)
{
    uint8_t c, result = 0;
    uint8_t ind_sw_cce_flag = 0;
    uint8_t num_gain_element_lists = 0;
    uint8_t num_coupled_elements = 0;

    element el_empty = {0};
    ic_stream ics_empty = {0};
    static int16_t sh_data[1024];

    c = faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,900,"coupling_channel_element(): element_instance_tag"));

    ind_sw_cce_flag = faad_get1bit(ld
        DEBUGVAR(1,901,"coupling_channel_element(): ind_sw_cce_flag"));
    num_coupled_elements = faad_getbits(ld, 3
        DEBUGVAR(1,902,"coupling_channel_element(): num_coupled_elements"));

    for (c = 0; c < num_coupled_elements + 1; c++)
    {
        uint8_t cc_target_is_cpe, cc_target_tag_select;

        num_gain_element_lists++;

        cc_target_is_cpe = faad_get1bit(ld
            DEBUGVAR(1,903,"coupling_channel_element(): cc_target_is_cpe"));
        cc_target_tag_select = faad_getbits(ld, 4
            DEBUGVAR(1,904,"coupling_channel_element(): cc_target_tag_select"));

        if (cc_target_is_cpe)
        {
            uint8_t cc_l = faad_get1bit(ld
                DEBUGVAR(1,905,"coupling_channel_element(): cc_l"));
            uint8_t cc_r = faad_get1bit(ld
                DEBUGVAR(1,906,"coupling_channel_element(): cc_r"));

            if (cc_l && cc_r)
                num_gain_element_lists++;
        }
    }

    faad_get1bit(ld
        DEBUGVAR(1,907,"coupling_channel_element(): cc_domain"));
    faad_get1bit(ld
        DEBUGVAR(1,908,"coupling_channel_element(): gain_element_sign"));
    faad_getbits(ld, 2
        DEBUGVAR(1,909,"coupling_channel_element(): gain_element_scale"));

    if ((result = individual_channel_stream(hDecoder, &el_empty, ld, &ics_empty,
        0, sh_data)) > 0)
    {
        return result;
    }

    for (c = 1; c < num_gain_element_lists; c++)
    {
        uint8_t cge;

        if (ind_sw_cce_flag)
        {
            cge = 1;
        } else {
            cge = faad_get1bit(ld
                DEBUGVAR(1,910,"coupling_channel_element(): common_gain_element_present"));
        }

        if (cge)
        {
            huffman_scale_factor(ld);
        } else {
            uint8_t g, sfb;

            for (g = 0; g < ics_empty.num_window_groups; g++)
            {
                for (sfb = 0; sfb < ics_empty.max_sfb; sfb++)
                {
                    if (ics_empty.sfb_cb[g][sfb] != ZERO_HCB)
                        huffman_scale_factor(ld);
                }
            }
        }
    }

    return 0;
}
#endif

/* Table 4.4.10 */
static uint16_t data_stream_element(NeAACDecHandle hDecoder, bitfile *ld)
{
    uint8_t byte_aligned;
    uint16_t i, count;

    (void)hDecoder;

    /* element_instance_tag = */ faad_getbits(ld, LEN_TAG
        DEBUGVAR(1,60,"data_stream_element(): element_instance_tag"));
    byte_aligned = faad_get1bit(ld
        DEBUGVAR(1,61,"data_stream_element(): byte_aligned"));
    count = (uint16_t)faad_getbits(ld, 8
        DEBUGVAR(1,62,"data_stream_element(): count"));
    if (count == 255)
    {
        count += (uint16_t)faad_getbits(ld, 8
            DEBUGVAR(1,63,"data_stream_element(): extra count"));
    }
    if (byte_aligned)
        faad_byte_align(ld);

    for (i = 0; i < count; i++)
    {
        faad_getbits(ld, LEN_BYTE
            DEBUGVAR(1,64,"data_stream_element(): data_stream_byte"));
    }

    return count;
}

/* Table 4.4.11 */
static uint8_t fill_element(NeAACDecHandle hDecoder, bitfile *ld, drc_info *drc
#ifdef SBR_DEC
                            ,uint8_t sbr_ele
#endif
                            )
{
    uint16_t count;
#ifdef SBR_DEC
    uint8_t bs_extension_type;
#endif

    count = (uint16_t)faad_getbits(ld, 4
        DEBUGVAR(1,65,"fill_element(): count"));
    if (count == 15)
    {
        count += (uint16_t)faad_getbits(ld, 8
            DEBUGVAR(1,66,"fill_element(): extra count")) - 1;
    }

    if (count > 0)
    {
#ifdef SBR_DEC
        bs_extension_type = (uint8_t)faad_showbits(ld, 4);

        if ((bs_extension_type == EXT_SBR_DATA) ||
            (bs_extension_type == EXT_SBR_DATA_CRC))
        {
            if (sbr_ele == INVALID_SBR_ELEMENT)
                return 24;

            if (!hDecoder->sbr[sbr_ele])
            {
                hDecoder->sbr[sbr_ele] = sbrDecodeInit(hDecoder->frameLength,
                    hDecoder->element_id[sbr_ele], 2*get_sample_rate(hDecoder->sf_index),
                    hDecoder->downSampledSBR
#ifdef DRM
                    , 0
#endif
                    );
            }

            hDecoder->sbr_present_flag = 1;

            /* parse the SBR data */
            hDecoder->sbr[sbr_ele]->ret = sbr_extension_data(ld, hDecoder->sbr[sbr_ele], count);

#if 0
            if (hDecoder->sbr[sbr_ele]->ret > 0)
            {
                printf("%s\n", NeAACDecGetErrorMessage(hDecoder->sbr[sbr_ele]->ret));
            }
#endif

#if (defined(PS_DEC) || defined(DRM_PS))
            if (hDecoder->sbr[sbr_ele]->ps_used)
            {
                hDecoder->ps_used[sbr_ele] = 1;

                /* set element independent flag to 1 as well */
                hDecoder->ps_used_global = 1;
            }
#endif
        } else {
#endif
            while (count > 0)
            {
                count -= extension_payload(ld, drc, count);
            }
#ifdef SBR_DEC
        }
#endif
    }

    return 0;
}

/* Table 4.4.12 */
#ifdef SSR_DEC
static void gain_control_data(bitfile *ld, ic_stream *ics)
{
    uint8_t bd, wd, ad;
    ssr_info *ssr = &(ics->ssr);

    ssr->max_band = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,1000,"gain_control_data(): max_band"));

    if (ics->window_sequence == ONLY_LONG_SEQUENCE)
    {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 1; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));
                    ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 5
                        DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                }
            }
        }
    } else if (ics->window_sequence == LONG_START_SEQUENCE) {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 2; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));
                    if (wd == 0)
                    {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    } else {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 2
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    }
                }
            }
        }
    } else if (ics->window_sequence == EIGHT_SHORT_SEQUENCE) {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 8; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));
                    ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 2
                        DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                }
            }
        }
    } else if (ics->window_sequence == LONG_STOP_SEQUENCE) {
        for (bd = 1; bd <= ssr->max_band; bd++)
        {
            for (wd = 0; wd < 2; wd++)
            {
                ssr->adjust_num[bd][wd] = (uint8_t)faad_getbits(ld, 3
                    DEBUGVAR(1,1001,"gain_control_data(): adjust_num"));

                for (ad = 0; ad < ssr->adjust_num[bd][wd]; ad++)
                {
                    ssr->alevcode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                        DEBUGVAR(1,1002,"gain_control_data(): alevcode"));

                    if (wd == 0)
                    {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 4
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    } else {
                        ssr->aloccode[bd][wd][ad] = (uint8_t)faad_getbits(ld, 5
                            DEBUGVAR(1,1003,"gain_control_data(): aloccode"));
                    }
                }
            }
        }
    }
}
#endif

#ifdef SCALABLE_DEC
ALIGN int16_t spec_data1[1024];
ALIGN int16_t spec_data2[1024];
/* Table 4.4.13 ASME */
void aac_scalable_main_element(NeAACDecHandle hDecoder, NeAACDecFrameInfo *hInfo,
                               bitfile *ld, program_config *pce, drc_info *drc)
{
    uint8_t retval = 0;
    uint8_t channels = hDecoder->fr_channels = 0;
    uint8_t ch;
    uint8_t this_layer_stereo = (hDecoder->channelConfiguration > 1) ? 1 : 0;
    element cpe = {0};
    ic_stream *ics1 = &(cpe.ics1);
    ic_stream *ics2 = &(cpe.ics2);
    int16_t *spec_data;

    memset(spec_data1,0,sizeof(spec_data1));
    memset(spec_data2,0,sizeof(spec_data2));
    hDecoder->fr_ch_ele = 0;

    hInfo->error = aac_scalable_main_header(hDecoder, ics1, ics2, ld, this_layer_stereo);
    if (hInfo->error > 0)
        return;

    cpe.common_window = 1;
    if (this_layer_stereo)
    {
        hDecoder->element_id[0] = ID_CPE;
        if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 0)
            hDecoder->element_output_channels[hDecoder->fr_ch_ele] = 2;
    } else {
        hDecoder->element_id[0] = ID_SCE;
    }

    for (ch = 0; ch < (this_layer_stereo ? 2 : 1); ch++)
    {
        ic_stream *ics;
        if (ch == 0)
        {
            ics = ics1;
            spec_data = spec_data1;
        } else {
            ics = ics2;
            spec_data = spec_data2;
        }

        hInfo->error = individual_channel_stream(hDecoder, &cpe, ld, ics, 1, spec_data);
        if (hInfo->error > 0)
            return;
    }

#ifdef DRM
#ifdef SBR_DEC
    /* In case of DRM we need to read the SBR info before channel reconstruction */
    if ((hDecoder->sbr_present_flag == 1) && (hDecoder->object_type == DRM_ER_LC))
    {
        bitfile ld_sbr = {0};
        uint32_t i;
        uint16_t count = 0;
        uint8_t *revbuffer;
        uint8_t *prevbufstart;
        uint8_t *pbufend;

        /* all forward bitreading should be finished at this point */
        uint32_t bitsconsumed = faad_get_processed_bits(ld);
        uint32_t buffer_size = faad_origbitbuffer_size(ld);
        uint8_t *buffer = (uint8_t*)faad_origbitbuffer(ld);

        if (bitsconsumed + 8 > buffer_size*8)
        {
            hInfo->error = 14;
            return;
        }

        if (!hDecoder->sbr[0])
        {
            hDecoder->sbr[0] = sbrDecodeInit(hDecoder->frameLength, hDecoder->element_id[0],
                2*get_sample_rate(hDecoder->sf_index), 0 /* ds SBR */, 1);
        }

        /* Reverse bit reading of SBR data in DRM audio frame */
        revbuffer = (uint8_t*)faad_malloc(buffer_size*sizeof(uint8_t));
        prevbufstart = revbuffer;
        pbufend = &buffer[buffer_size - 1];
        for (i = 0; i < buffer_size; i++)
            *prevbufstart++ = tabFlipbits[*pbufend--];

        /* Set SBR data */
        /* consider 8 bits from AAC-CRC */
        count = (uint16_t)bit2byte(buffer_size*8 - bitsconsumed);
        faad_initbits(&ld_sbr, revbuffer, count);

        hDecoder->sbr[0]->sample_rate = get_sample_rate(hDecoder->sf_index);
        hDecoder->sbr[0]->sample_rate *= 2;

        faad_getbits(&ld_sbr, 8); /* Skip 8-bit CRC */

        hDecoder->sbr[0]->ret = sbr_extension_data(&ld_sbr, hDecoder->sbr[0], count);
#if (defined(PS_DEC) || defined(DRM_PS))
        if (hDecoder->sbr[0]->ps_used)
        {
            hDecoder->ps_used[0] = 1;
            hDecoder->ps_used_global = 1;
        }
#endif

        /* check CRC */
        /* no need to check it if there was already an error */
        if (hDecoder->sbr[0]->ret == 0)
            hDecoder->sbr[0]->ret = (uint8_t)faad_check_CRC(&ld_sbr, (uint16_t)faad_get_processed_bits(&ld_sbr) - 8);

        /* SBR data was corrupted, disable it until the next header */
        if (hDecoder->sbr[0]->ret != 0)
        {
            hDecoder->sbr[0]->header_count = 0;  
        }

        faad_endbits(&ld_sbr);

        if (revbuffer)
            faad_free(revbuffer);
    }
#endif
#endif

    if (this_layer_stereo)
    {
        hInfo->error = reconstruct_channel_pair(hDecoder, ics1, ics2, &cpe, spec_data1, spec_data2);
        if (hInfo->error > 0)
            return;
    } else {
        hInfo->error = reconstruct_single_channel(hDecoder, ics1, &cpe, spec_data1);
        if (hInfo->error > 0)
            return;
    }

    /* map output channels position to internal data channels */
    if (hDecoder->element_output_channels[hDecoder->fr_ch_ele] == 2)
    {
        /* this might be faulty when pce_set is true */
        hDecoder->internal_channel[channels] = channels;
        hDecoder->internal_channel[channels+1] = channels+1;
    } else {
        hDecoder->internal_channel[channels] = channels;
    }

    hDecoder->fr_channels += hDecoder->element_output_channels[hDecoder->fr_ch_ele];
    hDecoder->fr_ch_ele++;

    return;
}

/* Table 4.4.15 */
static int8_t aac_scalable_main_header(NeAACDecHandle hDecoder, ic_stream *ics1, ic_stream *ics2,
                                       bitfile *ld, uint8_t this_layer_stereo)
{
    uint8_t retval = 0;
    uint8_t ch;
    ic_stream *ics;

    /* ics1->ics_reserved_bit = */ faad_get1bit(ld
        DEBUGVAR(1,300,"aac_scalable_main_header(): ics_reserved_bits"));
    ics1->window_sequence = (uint8_t)faad_getbits(ld, 2
        DEBUGVAR(1,301,"aac_scalable_main_header(): window_sequence"));
    ics1->window_shape = faad_get1bit(ld
        DEBUGVAR(1,302,"aac_scalable_main_header(): window_shape"));

    if (ics1->window_sequence == EIGHT_SHORT_SEQUENCE)
    {
        ics1->max_sfb = (uint8_t)faad_getbits(ld, 4
            DEBUGVAR(1,303,"aac_scalable_main_header(): max_sfb (short)"));
        ics1->scale_factor_grouping = (uint8_t)faad_getbits(ld, 7
            DEBUGVAR(1,304,"aac_scalable_main_header(): scale_factor_grouping"));
    } else {
        ics1->max_sfb = (uint8_t)faad_getbits(ld, 6
            DEBUGVAR(1,305,"aac_scalable_main_header(): max_sfb (long)"));
    }

    /* get the grouping information */
    if ((retval = window_grouping_info(hDecoder, ics1)) > 0)
        return retval;

    /* should be an error */
    /* check the range of max_sfb */
    if (ics1->max_sfb > ics1->num_swb)
        return 16;

    if (this_layer_stereo)
    {
        ics1->ms_mask_present = (uint8_t)faad_getbits(ld, 2
            DEBUGVAR(1,306,"aac_scalable_main_header(): ms_mask_present"));
        if (ics1->ms_mask_present == 1)
        {
            uint8_t g, sfb;
            for (g = 0; g < ics1->num_window_groups; g++)
            {
                for (sfb = 0; sfb < ics1->max_sfb; sfb++)
                {
                    ics1->ms_used[g][sfb] = faad_get1bit(ld
                        DEBUGVAR(1,307,"aac_scalable_main_header(): faad_get1bit"));
                }
            }
        }

        memcpy(ics2, ics1, sizeof(ic_stream));
    } else {
        ics1->ms_mask_present = 0;
    }

    if (0)
    {
        faad_get1bit(ld
            DEBUGVAR(1,308,"aac_scalable_main_header(): tns_channel_mono_layer"));
    }

    for (ch = 0; ch < (this_layer_stereo ? 2 : 1); ch++)
    {
        if (ch == 0)
            ics = ics1;
        else
            ics = ics2;

        if ( 1 /*!tvq_layer_pesent || (tns_aac_tvq_en[ch] == 1)*/)
        {
            if ((ics->tns_data_present = faad_get1bit(ld
                DEBUGVAR(1,309,"aac_scalable_main_header(): tns_data_present"))) & 1)
            {
#ifdef DRM
                /* different order of data units in DRM */
                if (hDecoder->object_type != DRM_ER_LC)
#endif
                {
                    tns_data(ics, &(ics->tns), ld);
                }
            }
        }
#if 0
        if (0 /*core_flag || tvq_layer_pesent*/)
        {
            if ((ch==0) || ((ch==1) && (core_stereo || tvq_stereo))
                diff_control_data();
            if (mono_stereo_flag)
                diff_control_data_lr();
        } else {
#endif
            if ((
#ifdef LTP_DEC
                ics->ltp.data_present =
#endif
                faad_get1bit(ld DEBUGVAR(1,310,"aac_scalable_main_header(): ltp.data_present"))) & 1)
            {
#ifdef LTP_DEC
                if ((retval = ltp_data(hDecoder, ics, &(ics->ltp), ld)) > 0)
                {
                    return retval;
                }
#else
                return 26;
#endif
            }
#if 0
        }
#endif
    }

    return 0;
}
#endif

/* Table 4.4.24 */
static uint8_t individual_channel_stream(NeAACDecHandle hDecoder, element *ele,
                                         bitfile *ld, ic_stream *ics, uint8_t scal_flag,
                                         int16_t *spec_data)
{
    uint8_t result;

    ics->global_gain = (uint8_t)faad_getbits(ld, 8
        DEBUGVAR(1,67,"individual_channel_stream(): global_gain"));

    if (!ele->common_window && !scal_flag)
    {
        if ((result = ics_info(hDecoder, ics, ld, ele->common_window)) > 0)
            return result;
    }

    if ((result = section_data(hDecoder, ics, ld)) > 0)
        return result;

    if ((result = scale_factor_data(hDecoder, ics, ld)) > 0)
        return result;

    if (!scal_flag)
    {
        /**
         **  NOTE: It could be that pulse data is available in scalable AAC too,
         **        as said in Amendment 1, this could be only the case for ER AAC,
         **        though. (have to check this out later)
         **/
        /* get pulse data */
        if ((ics->pulse_data_present = faad_get1bit(ld
            DEBUGVAR(1,68,"individual_channel_stream(): pulse_data_present"))) & 1)
        {
            if ((result = pulse_data(ics, &(ics->pul), ld)) > 0)
                return result;
        }

        /* get tns data */
        if ((ics->tns_data_present = faad_get1bit(ld
            DEBUGVAR(1,69,"individual_channel_stream(): tns_data_present"))) & 1)
        {
#ifdef ERROR_RESILIENCE
            if (hDecoder->object_type < ER_OBJECT_START)
#endif
                tns_data(ics, &(ics->tns), ld);
        }

        /* get gain control data */
        if ((ics->gain_control_data_present = faad_get1bit(ld
            DEBUGVAR(1,70,"individual_channel_stream(): gain_control_data_present"))) & 1)
        {
#ifdef SSR_DEC
            if (hDecoder->object_type != SSR)
                return 1;
            else
                gain_control_data(ld, ics);
#else
            return 1;
#endif
        }
    }

#ifdef ERROR_RESILIENCE
    if (hDecoder->aacSpectralDataResilienceFlag)
    {
        ics->length_of_reordered_spectral_data = (uint16_t)faad_getbits(ld, 14
            DEBUGVAR(1,147,"individual_channel_stream(): length_of_reordered_spectral_data"));

        if (hDecoder->channelConfiguration == 2)
        {
            if (ics->length_of_reordered_spectral_data > 6144)
                ics->length_of_reordered_spectral_data = 6144;
        } else {
            if (ics->length_of_reordered_spectral_data > 12288)
                ics->length_of_reordered_spectral_data = 12288;
        }

        ics->length_of_longest_codeword = (uint8_t)faad_getbits(ld, 6
            DEBUGVAR(1,148,"individual_channel_stream(): length_of_longest_codeword"));
        if (ics->length_of_longest_codeword >= 49)
            ics->length_of_longest_codeword = 49;
    }

    /* RVLC spectral data is put here */
    if (hDecoder->aacScalefactorDataResilienceFlag)
    {
        if ((result = rvlc_decode_scale_factors(ics, ld)) > 0)
            return result;
    }

    if (hDecoder->object_type >= ER_OBJECT_START) 
    {
        if (ics->tns_data_present)
            tns_data(ics, &(ics->tns), ld);
    }

#ifdef DRM
    /* CRC check */
    if (hDecoder->object_type == DRM_ER_LC)
        if ((result = (uint8_t)faad_check_CRC(ld, (uint16_t)faad_get_processed_bits(ld) - 8)) > 0)
            return result;
#endif

    if (hDecoder->aacSpectralDataResilienceFlag)
    {
        /* error resilient spectral data decoding */
        if ((result = reordered_spectral_data(hDecoder, ics, ld, spec_data)) > 0)
        {
            return result;
        }
    } else {
#endif
        /* decode the spectral data */
        if ((result = spectral_data(hDecoder, ics, ld, spec_data)) > 0)
        {
            return result;
        }
#ifdef ERROR_RESILIENCE
    }
#endif

    /* pulse coding reconstruction */
    if (ics->pulse_data_present)
    {
        if (ics->window_sequence != EIGHT_SHORT_SEQUENCE)
        {
            if ((result = pulse_decode(ics, spec_data, hDecoder->frameLength)) > 0)
                return result;
        } else {
            return 2; /* pulse coding not allowed for short blocks */
        }
    }

    return 0;
}

/* Table 4.4.25 */
static uint8_t section_data(NeAACDecHandle hDecoder, ic_stream *ics, bitfile *ld)
{
    uint8_t g;
    uint8_t sect_esc_val, sect_bits;

    if (ics->window_sequence == EIGHT_SHORT_SEQUENCE)
        sect_bits = 3;
    else
        sect_bits = 5;
    sect_esc_val = (1<<sect_bits) - 1;

#if 0
    printf("\ntotal sfb %d\n", ics->max_sfb);
    printf("   sect    top     cb\n");
#endif

    for (g = 0; g < ics->num_window_groups; g++)
    {
        uint8_t k = 0;
        uint8_t i = 0;

        while (k < ics->max_sfb)
        {
#ifdef ERROR_RESILIENCE
            uint8_t vcb11 = 0;
#endif
            uint8_t sfb;
            uint8_t sect_len_incr;
            uint16_t sect_len = 0;
            uint8_t sect_cb_bits = 4;

            /* if "faad_getbits" detects error and returns "0", "k" is never
               incremented and we cannot leave the while loop */
            if ((ld->error != 0) || (ld->no_more_reading))
                return 14;

#ifdef ERROR_RESILIENCE
            if (hDecoder->aacSectionDataResilienceFlag)
                sect_cb_bits = 5;
#else
            (void) hDecoder;
#endif

            ics->sect_cb[g][i] = (uint8_t)faad_getbits(ld, sect_cb_bits
                DEBUGVAR(1,71,"section_data(): sect_cb"));

#if 0
            printf("%d\n", ics->sect_cb[g][i]);
#endif

            if (ics->sect_cb[g][i] == NOISE_HCB)
                ics->noise_used = 1;

#ifdef ERROR_RESILIENCE
            if (hDecoder->aacSectionDataResilienceFlag)
            {
                if ((ics->sect_cb[g][i] == 11) ||
                    ((ics->sect_cb[g][i] >= 16) && (ics->sect_cb[g][i] <= 32)))
                {
                    vcb11 = 1;
                }
            }
            if (vcb11)
            {
                sect_len_incr = 1;
            } else {
#endif
                sect_len_incr = (uint8_t)faad_getbits(ld, sect_bits
                    DEBUGVAR(1,72,"section_data(): sect_len_incr"));
#ifdef ERROR_RESILIENCE
            }
#endif
            while ((sect_len_incr == sect_esc_val) /* &&
                (k+sect_len < ics->max_sfb)*/)
            {
                sect_len += sect_len_incr;
                sect_len_incr = (uint8_t)faad_getbits(ld, sect_bits
                    DEBUGVAR(1,72,"section_data(): sect_len_incr"));
            }

            sect_len += sect_len_incr;

            ics->sect_start[g][i] = k;
            ics->sect_end[g][i] = k + sect_len;

#if 0
            printf("%d\n", ics->sect_start[g][i]);
#endif
#if 0
            printf("%d\n", ics->sect_end[g][i]);
#endif

            if (k + sect_len >= 8*15)
                return 15;
            if (i >= 8*15)
                return 15;

            for (sfb = k; sfb < k + sect_len; sfb++)
            {
                ics->sfb_cb[g][sfb] = ics->sect_cb[g][i];
#if 0
                printf("%d\n", ics->sfb_cb[g][sfb]);
#endif
            }

#if 0
            printf(" %6d %6d %6d\n",
                i,
                ics->sect_end[g][i],
                ics->sect_cb[g][i]);
#endif

            k += sect_len;
            i++;
        }
        ics->num_sec[g] = i;
#if 0
        printf("%d\n", ics->num_sec[g]);
#endif
    }

#if 0
    printf("\n");
#endif

    return 0;
}

/*
 *  decode_scale_factors()
 *   decodes the scalefactors from the bitstream
 */
/*
 * All scalefactors (and also the stereo positions and pns energies) are
 * transmitted using Huffman coded DPCM relative to the previous active
 * scalefactor (respectively previous stereo position or previous pns energy,
 * see subclause 4.6.2 and 4.6.3). The first active scalefactor is
 * differentially coded relative to the global gain.
 */
static uint8_t decode_scale_factors(ic_stream *ics, bitfile *ld)
{
    uint8_t g, sfb;
    int16_t t;
    int8_t noise_pcm_flag = 1;

    int16_t scale_factor = ics->global_gain;
    int16_t is_position = 0;
    int16_t noise_energy = ics->global_gain - 90;

    for (g = 0; g < ics->num_window_groups; g++)
    {
        for (sfb = 0; sfb < ics->max_sfb; sfb++)
        {
            switch (ics->sfb_cb[g][sfb])
            {
            case ZERO_HCB: /* zero book */
                ics->scale_factors[g][sfb] = 0;
//#define SF_PRINT
#ifdef SF_PRINT
                printf("%d\n", ics->scale_factors[g][sfb]);
#endif
                break;
            case INTENSITY_HCB: /* intensity books */
            case INTENSITY_HCB2:

                /* decode intensity position */
                t = huffman_scale_factor(ld);
                is_position += (t - 60);
                ics->scale_factors[g][sfb] = is_position;
#ifdef SF_PRINT
                printf("%d\n", ics->scale_factors[g][sfb]);
#endif

                break;
            case NOISE_HCB: /* noise books */