Initial check-in of AAC codec. Currently only recognises the .mp4 extension and is not yet capable of realtime operation

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7706 a1c6a512-1295-4272-9138-f99709370657

1 files changed, 184 insertions, 0 deletions

diff --git a/apps/codecs/aac.c b/apps/codecs/aac.c
new file mode 100644
index 0000000..79fb5cb
--- /dev/null
+++ b/apps/codecs/aac.c
@@ -0,0 +1,184 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2005 Dave Chapman
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "codeclib.h"
+#include "libm4a/m4a.h"
+#include "libfaad/common.h"
+#include "libfaad/structs.h"
+#include "libfaad/decoder.h"
+
+#ifndef SIMULATOR
+extern char iramcopy[];
+extern char iramstart[];
+extern char iramend[];
+#endif
+
+struct codec_api* rb;
+struct codec_api* ci;
+
+/* this is the codec entry point */
+enum codec_status codec_start(struct codec_api* api)
+{
+  size_t n;
+  static demux_res_t demux_res;
+  stream_t input_stream;
+  uint32_t samplesdone;
+  uint32_t elapsedtime;
+  uint32_t sample_duration;
+  uint32_t sample_byte_size;
+  int samplesdecoded;
+  unsigned int i;
+  unsigned char* buffer;
+  static NeAACDecFrameInfo frameInfo;
+  NeAACDecHandle hDecoder;
+  int err;
+  int16_t* decodedbuffer;
+
+  /* Generic codec initialisation */
+  TEST_CODEC_API(api);
+
+  rb = api;
+  ci = (struct codec_api*)api;
+
+#ifndef SIMULATOR
+  rb->memcpy(iramstart, iramcopy, iramend-iramstart);
+#endif
+
+  ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*2));
+  ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*16));
+  ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(1024*512));
+
+  ci->configure(CODEC_DSP_ENABLE, (bool *)true);
+  ci->configure(DSP_DITHER, (bool *)false);
+  ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_INTERLEAVED);
+  ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(16));
+  
+  next_track:
+
+  if (codec_init(api)) {
+    LOGF("FAAD: Error initialising codec\n");
+    return CODEC_ERROR;
+  }
+
+  while (!rb->taginfo_ready)
+    rb->yield();
+  
+  ci->configure(DSP_SET_FREQUENCY, (long *)(rb->id3->frequency));
+
+  stream_create(&input_stream,ci);
+
+  /* if qtmovie_read returns successfully, the stream is up to
+   * the movie data, which can be used directly by the decoder */
+  if (!qtmovie_read(&input_stream, &demux_res)) {
+    LOGF("FAAD: Error initialising file\n");
+    return CODEC_ERROR;
+  }
+
+  /* initialise the sound converter */
+  hDecoder = NULL;
+  hDecoder = NeAACDecOpen();
+
+  if (!hDecoder) {
+    LOGF("FAAD: Error opening decoder\n");
+    return CODEC_ERROR;
+  }
+
+  NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(hDecoder);
+  conf->outputFormat = 1; // 16-bit integers
+  NeAACDecSetConfiguration(hDecoder, conf);
+
+  unsigned long s=0;
+  unsigned char c=0;
+
+  err = NeAACDecInit2(hDecoder, demux_res.codecdata,demux_res.codecdata_len, &s, &c);
+  if (err) {
+    LOGF("FAAD: Error initialising decoder: %d, type=%d\n", err,hDecoder->object_type);
+    return CODEC_ERROR;
+  }
+
+  ci->id3->frequency=s;
+
+  i=0;
+  samplesdone=0;
+  /* The main decoding loop */
+  while (i < demux_res.num_sample_byte_sizes) {
+    rb->yield();
+    if (ci->stop_codec || ci->reload_codec) {
+      break;
+    }
+
+    /* Deal with any pending seek requests */
+    if (ci->seek_time) {
+      if (alac_seek(&demux_res,&input_stream,
+                    (ci->seek_time/10) * (ci->id3->frequency/100),
+                    &samplesdone, &i)) {
+        elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
+        ci->set_elapsed(elapsedtime);
+      }
+      ci->seek_time = 0;
+    }
+
+    /* Lookup the length (in samples and bytes) of block i */
+    if (!get_sample_info(&demux_res, i, &sample_duration, 
+                         &sample_byte_size)) {
+      LOGF("AAC: Error in get_sample_info\n");
+      return CODEC_ERROR;
+    }
+
+    /* Request the required number of bytes from the input buffer */
+    buffer=ci->request_buffer((long*)&n,sample_byte_size);
+
+    /* Decode one block - returned samples will be host-endian */
+    rb->yield();
+    decodedbuffer = NeAACDecDecode(hDecoder, &frameInfo, buffer, n);
+
+    if (frameInfo.error > 0) {
+       LOGF("FAAD: decoding error \"%s\"\n", NeAACDecGetErrorMessage(frameInfo.error));
+       return CODEC_ERROR;
+    }
+
+    /* Get the number of decoded samples */
+    samplesdecoded=frameInfo.samples;
+
+    /* Advance codec buffer */
+    ci->advance_buffer(n);
+
+    /* Output the audio */
+    rb->yield();
+    while (!rb->pcmbuf_insert((char*)decodedbuffer, frameInfo.samples << 1))
+      rb->yield();
+
+    /* Update the elapsed-time indicator */
+    samplesdone+=sample_duration;
+    elapsedtime=(samplesdone*10)/(ci->id3->frequency/100);
+    ci->set_elapsed(elapsedtime);
+
+    /* Keep track of current position - for resuming */
+    ci->set_offset(elapsedtime);
+
+    i++;
+  }
+
+  LOGF("AAC: Decoded %d samples\n",samplesdone);
+
+  if (ci->request_next_track())
+   goto next_track;
+
+  return CODEC_OK;
+}