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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 Antonius Hellmann
*
* 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.
*
****************************************************************************/
#ifndef SIMULATOR
#include "codeclib.h"
CODEC_HEADER
static struct codec_api *ci;
static int enc_channels;
#define CHUNK_SIZE 8192
static unsigned char wav_header[44] =
{'R','I','F','F',0,0,0,0,'W','A','V','E','f','m','t',' ',16,
0,0,0,1,0,2,0,0x44,0xac,0,0,0x10,0xb1,2,0,4,0,16,0,'d','a','t','a',0,0,0,0};
static unsigned char wav_header_mono[44] =
{'R','I','F','F',0,0,0,0,'W','A','V','E','f','m','t',' ',16,
0,0,0,1,0,1,0,0x44,0xac,0,0,0x88,0x58,1,0,2,0,16,0,'d','a','t','a',0,0,0,0};
/* update file header info callback function (called by main application) */
void enc_set_header(void *head_buffer, /* ptr to the file header data */
int head_size, /* size of this header data */
int num_pcm_samples, /* amount of processed pcm samples */
bool is_file_header)
{
int num_file_bytes = num_pcm_samples * 2 * enc_channels;
if(is_file_header)
{
/* update file header before file closing */
if((int)sizeof(wav_header) < head_size)
{
/* update wave header size entries: special to WAV format */
*(long*)(head_buffer+ 4) = htole32(num_file_bytes + 36);
*(long*)(head_buffer+40) = htole32(num_file_bytes);
}
}
}
/* main codec entry point */
enum codec_status codec_start(struct codec_api* api)
{
int i;
long lr;
unsigned long t;
unsigned long *src;
unsigned long *dst;
int chunk_size, num_chunks, samp_per_chunk;
int enc_buffer_size;
int enc_quality;
bool cpu_boosted = true; /* start boosted */
ci = api; // copy to global api pointer
if(ci->enc_get_inputs == NULL ||
ci->enc_set_parameters == NULL ||
ci->enc_alloc_chunk == NULL ||
ci->enc_free_chunk == NULL ||
ci->enc_wavbuf_near_empty == NULL ||
ci->enc_get_wav_data == NULL ||
ci->enc_set_header_callback == NULL )
return CODEC_ERROR;
ci->cpu_boost(true);
*ci->enc_set_header_callback = enc_set_header;
ci->enc_get_inputs(&enc_buffer_size, &enc_channels, &enc_quality);
/* configure the buffer system */
chunk_size = sizeof(long) + CHUNK_SIZE * enc_channels / 2;
num_chunks = enc_buffer_size / chunk_size;
samp_per_chunk = CHUNK_SIZE / 4;
/* inform the main program about buffer dimensions and other params */
ci->enc_set_parameters(chunk_size, num_chunks, samp_per_chunk,
(enc_channels == 2) ? wav_header : wav_header_mono,
sizeof(wav_header), AFMT_PCM_WAV);
/* main application waits for this flag during encoder loading */
ci->enc_codec_loaded = true;
/* main encoding loop */
while(!ci->stop_codec)
{
while((src = (unsigned long*)ci->enc_get_wav_data(CHUNK_SIZE)) != NULL)
{
if(ci->stop_codec)
break;
if(ci->enc_wavbuf_near_empty() == 0)
{
if(!cpu_boosted)
{
ci->cpu_boost(true);
cpu_boosted = true;
}
}
dst = (unsigned long*)ci->enc_alloc_chunk();
*dst++ = CHUNK_SIZE * enc_channels / 2; /* set size info */
if(enc_channels == 2)
{
/* swap byte order & copy to destination */
for (i=0; i<CHUNK_SIZE/4; i++)
{
t = *src++;
*dst++ = ((t >> 8) & 0xff00ff) | ((t << 8) & 0xff00ff00);
}
}
else
{
/* mix left/right, swap byte order & copy to destination */
for (i=0; i<CHUNK_SIZE/8; i++)
{
lr = (long)*src++;
lr = (((lr<<16)>>16) + (lr>>16)) >> 1; /* left+right */
t = (lr << 16);
lr = (long)*src++;
lr = (((lr<<16)>>16) + (lr>>16)) >> 1; /* left+right */
t |= lr & 0xffff;
*dst++ = ((t >> 8) & 0xff00ff) | ((t << 8) & 0xff00ff00);
}
}
ci->enc_free_chunk();
ci->yield();
}
if(ci->enc_wavbuf_near_empty())
{
if(cpu_boosted)
{
ci->cpu_boost(false);
cpu_boosted = false;
}
}
ci->yield();
}
if(cpu_boosted) /* set initial boost state */
ci->cpu_boost(false);
/* reset parameters to initial state */
ci->enc_set_parameters(0, 0, 0, 0, 0, 0);
/* main application waits for this flag during encoder removing */
ci->enc_codec_loaded = false;
return CODEC_OK;
}
#endif
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