mirror of https://github.com/mpv-player/mpv
60 lines
1.4 KiB
C
60 lines
1.4 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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#include "../adpcm.h"
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static ad_info_t info =
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{
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"IMA ADPCM audio decoder",
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"imaadpcm",
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AFM_IMAADPCM,
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"Nick Kurshev",
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"Mike Melanson",
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"ima4 (MOV files)"
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};
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LIBAD_EXTERN(imaadpcm)
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static int init(sh_audio_t *sh_audio)
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{
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/* IMA-ADPCM 4:1 audio codec:*/
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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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/* decodes 34 byte -> 64 short*/
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sh_audio->i_bps=IMA_ADPCM_BLOCK_SIZE*(sh_audio->channels*sh_audio->samplerate)/
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IMA_ADPCM_SAMPLES_PER_BLOCK; /* 1:4 */
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return 1;
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}
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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=4096;
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sh_audio->ds->ss_div=IMA_ADPCM_SAMPLES_PER_BLOCK;
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sh_audio->ds->ss_mul=IMA_ADPCM_BLOCK_SIZE * sh_audio->wf->nChannels;
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return 1;
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}
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static void uninit(sh_audio_t *sh)
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{
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}
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static int control(sh_audio_t *sh,int cmd,void* arg, ...)
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{
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// TODO!!!
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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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unsigned char ibuf[IMA_ADPCM_BLOCK_SIZE * 2]; /* bytes / stereo frame */
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if (demux_read_data(sh_audio->ds, ibuf,
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IMA_ADPCM_BLOCK_SIZE * sh_audio->wf->nChannels) !=
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IMA_ADPCM_BLOCK_SIZE * sh_audio->wf->nChannels)
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return -1;
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return 2*ima_adpcm_decode_block((unsigned short*)buf,ibuf, sh_audio->wf->nChannels);
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}
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