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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 =
{
"Duck DK4 ADPCM (rogue format number) audio decoder",
"dk4adpcm",
AFM_DK4ADPCM,
"Nick Kurshev",
"Mike Melanson",
"This format number was used by Duck Corp. but not officially registered with Microsoft"
};
LIBAD_EXTERN(dk4adpcm)
#define DK4_ADPCM_PREAMBLE_SIZE 4
static int preinit(sh_audio_t *sh_audio)
{
sh_audio->audio_out_minsize =
(((sh_audio->wf->nBlockAlign - DK4_ADPCM_PREAMBLE_SIZE) * 2) + 1) * 4;
sh_audio->ds->ss_div =
((sh_audio->wf->nBlockAlign - DK4_ADPCM_PREAMBLE_SIZE) * 2) + 1;
sh_audio->audio_in_minsize=
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->wf->nBlockAlign - DK4_ADPCM_PREAMBLE_SIZE) * 2) + 1);
return 1;
}
static void uninit(sh_audio_t *sh_audio)
{
}
static int control(sh_audio_t *sh_audio,int cmd,void* arg, ...)
{
// TODO!
if(cmd==ADCTRL_SKIP_FRAME){
demux_read_data(sh_audio->ds, sh_audio->a_in_buffer,sh_audio->wf->nBlockAlign);
return CONTROL_TRUE;
}
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->wf->nBlockAlign) !=
sh_audio->wf->nBlockAlign)
return -1; /* EOF */
return 2 * dk4_adpcm_decode_block((unsigned short*)buf,
sh_audio->a_in_buffer,
sh_audio->wf->nChannels, sh_audio->wf->nBlockAlign);
}
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