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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "ad_internal.h"
#include "../adpcm.h"
static ad_info_t info =
{
"IMA ADPCM audio decoder",
"imaadpcm",
AFM_IMAADPCM,
"Nick Kurshev",
"Mike Melanson",
"ima4 (MOV files)"
};
LIBAD_EXTERN(imaadpcm)
static int init(sh_audio_t *sh_audio)
{
/* IMA-ADPCM 4:1 audio codec:*/
sh_audio->channels=sh_audio->wf->nChannels;
sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
/* decodes 34 byte -> 64 short*/
sh_audio->i_bps=IMA_ADPCM_BLOCK_SIZE*(sh_audio->channels*sh_audio->samplerate)/
IMA_ADPCM_SAMPLES_PER_BLOCK; /* 1:4 */
return 1;
}
static int preinit(sh_audio_t *sh_audio)
{
sh_audio->audio_out_minsize=4096;
sh_audio->ds->ss_div=IMA_ADPCM_SAMPLES_PER_BLOCK;
sh_audio->ds->ss_mul=IMA_ADPCM_BLOCK_SIZE * sh_audio->wf->nChannels;
return 1;
}
static void uninit(sh_audio_t *sh)
{
}
static int control(sh_audio_t *sh,int cmd,void* arg, ...)
{
// TODO!!!
return CONTROL_UNKNOWN;
}
static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
{
unsigned char ibuf[IMA_ADPCM_BLOCK_SIZE * 2]; /* bytes / stereo frame */
if (demux_read_data(sh_audio->ds, ibuf,
IMA_ADPCM_BLOCK_SIZE * sh_audio->wf->nChannels) !=
IMA_ADPCM_BLOCK_SIZE * sh_audio->wf->nChannels)
return -1;
return 2*ima_adpcm_decode_block((unsigned short*)buf,ibuf, sh_audio->wf->nChannels);
}
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