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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "config.h"
#include "ad_internal.h"
static ad_info_t info =
{
"MS ADPCM audio decoder",
"msadpcm",
AFM_MSADPCM,
"Nick Kurshev",
"Mike Melanson",
""
};
LIBAD_EXTERN(msadpcm)
#define MS_ADPCM_PREAMBLE_SIZE 7
static int preinit(sh_audio_t *sh_audio)
{
sh_audio->audio_out_minsize = sh_audio->wf->nBlockAlign * 4;
sh_audio->ds->ss_div =
(sh_audio->wf->nBlockAlign - MS_ADPCM_PREAMBLE_SIZE) * 2;
sh_audio->ds->ss_mul = sh_audio->wf->nBlockAlign;
return 1;
}
static int init(sh_audio_t *sh_audio)
{
sh_audio->channels=sh_audio->wf->nChannels;
sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
sh_audio->i_bps = sh_audio->wf->nBlockAlign *
(sh_audio->channels*sh_audio->samplerate) / sh_audio->ds->ss_div;
if ((sh_audio->a_in_buffer =
(unsigned char *)malloc(sh_audio->ds->ss_mul)) == NULL)
return 0;
return 1;
}
static void uninit(sh_audio_t *sh_audio)
{
free(sh_audio->a_in_buffer);
}
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)
{
if (demux_read_data(sh_audio->ds, sh_audio->a_in_buffer,
sh_audio->ds->ss_mul) !=
sh_audio->ds->ss_mul)
return -1; /* EOF */
return 2 * ms_adpcm_decode_block(
(unsigned short*)buf, sh_audio->a_in_buffer,
sh_audio->wf->nChannels, sh_audio->wf->nBlockAlign);
}
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