mirror of https://github.com/mpv-player/mpv
105 lines
2.4 KiB
C
105 lines
2.4 KiB
C
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// Reference: DOCS/tech/hwac3.txt !!!!!
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "config.h"
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#include "mp_msg.h"
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#include "help_mp.h"
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#include "ad_internal.h"
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#include "../liba52/a52.h"
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extern int a52_fillbuff(sh_audio_t *sh_audio);
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static ad_info_t info =
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{
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"AC3 pass-through SP/DIF",
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"hwac3",
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"Nick Kurshev",
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"???",
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""
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};
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LIBAD_EXTERN(hwac3)
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static int preinit(sh_audio_t *sh)
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{
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/* Dolby AC3 audio: */
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sh->audio_out_minsize=4*256*6;
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sh->audio_in_minsize=3840;
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sh->channels=2;
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sh->sample_format=AFMT_AC3;
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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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/* Dolby AC3 passthrough:*/
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sample_t *a52_samples=a52_init(0);
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if (a52_samples == NULL) {
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mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 init failed\n");
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return 0;
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}
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if(a52_fillbuff(sh_audio)<0) {
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mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 sync failed\n");
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return 0;
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}
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/*
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sh_audio->samplerate=ai.samplerate; // SET by a52_fillbuff()
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sh_audio->samplesize=ai.framesize;
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sh_audio->i_bps=ai.bitrate*(1000/8); // SET by a52_fillbuff()
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sh_audio->ac3_frame=malloc(6144);
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sh_audio->o_bps=sh_audio->i_bps; // XXX FIXME!!! XXX
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o_bps is calculated from samplesize*channels*samplerate
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a single ac3 frame is always translated to 6144 byte packet. (zero padding)*/
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sh_audio->channels=2;
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sh_audio->samplesize=2; /* 2*2*(6*256) = 6144 (very TRICKY!)*/
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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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switch(cmd)
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{
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case ADCTRL_SKIP_FRAME:
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a52_fillbuff(sh); break; // skip AC3 frame
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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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int len=-1;
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if(!sh_audio->a_in_buffer_len)
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if((len=a52_fillbuff(sh_audio))<=0) return len; /*EOF*/
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sh_audio->a_in_buffer_len=0;
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// int ac3_iec958_build_burst(int length, int data_type, int big_endian, unsigned char * data, unsigned char * out)
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// len = ac3_iec958_build_burst(len, 0x01, 1, sh_audio->a_in_buffer, buf);
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buf[0] = 0x72;
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buf[1] = 0xF8;
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buf[2] = 0x1F;
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buf[3] = 0x4E;
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buf[4] = 0x01; //(length) ? data_type : 0; /* & 0x1F; */
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buf[5] = 0x00;
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buf[6] = (len << 3) & 0xFF;
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buf[7] = (len >> 5) & 0xFF;
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swab(sh_audio->a_in_buffer, buf + 8, len);
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//memcpy(buf + 8, sh_audio->a_in_buffer, len);
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memset(buf + 8 + len, 0, 6144 - 8 - len);
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return 6144;
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}
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