mirror of https://github.com/mpv-player/mpv
68 lines
1.7 KiB
C
68 lines
1.7 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "config.h"
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#include "ad_internal.h"
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static ad_info_t info =
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{
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"Duck DK4 ADPCM (rogue format number) audio decoder",
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"dk4adpcm",
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AFM_DK4ADPCM,
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"Nick Kurshev",
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"Mike Melanson",
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"This format number was used by Duck Corp. but not officially registered with Microsoft"
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};
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LIBAD_EXTERN(dk4adpcm)
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#define DK4_ADPCM_PREAMBLE_SIZE 4
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static int preinit(sh_audio_t *sh_audio)
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{
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sh_audio->audio_out_minsize =
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(((sh_audio->wf->nBlockAlign - DK4_ADPCM_PREAMBLE_SIZE) * 2) + 1) * 4;
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sh_audio->ds->ss_div =
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((sh_audio->wf->nBlockAlign - DK4_ADPCM_PREAMBLE_SIZE) * 2) + 1;
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sh_audio->audio_in_minsize=
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sh_audio->ds->ss_mul=sh_audio->wf->nBlockAlign;
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return 1;
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}
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static int init(sh_audio_t *sh_audio)
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{
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sh_audio->channels=sh_audio->wf->nChannels;
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sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
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sh_audio->i_bps = sh_audio->wf->nBlockAlign *
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(sh_audio->channels*sh_audio->samplerate) /
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(((sh_audio->wf->nBlockAlign - DK4_ADPCM_PREAMBLE_SIZE) * 2) + 1);
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return 1;
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}
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static void uninit(sh_audio_t *sh_audio)
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{
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}
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static int control(sh_audio_t *sh_audio,int cmd,void* arg, ...)
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{
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// TODO!
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if(cmd==ADCTRL_SKIP_FRAME){
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demux_read_data(sh_audio->ds, sh_audio->a_in_buffer,sh_audio->wf->nBlockAlign);
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return CONTROL_TRUE;
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}
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return CONTROL_UNKNOWN;
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}
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static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
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{
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if (demux_read_data(sh_audio->ds, sh_audio->a_in_buffer,
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sh_audio->wf->nBlockAlign) !=
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sh_audio->wf->nBlockAlign)
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return -1; /* EOF */
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return 2 * dk4_adpcm_decode_block((unsigned short*)buf,
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sh_audio->a_in_buffer,
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sh_audio->wf->nChannels, sh_audio->wf->nBlockAlign);
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}
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