mirror of https://github.com/mpv-player/mpv
146 lines
3.3 KiB
C
146 lines
3.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <sys/ioctl.h>
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#include "audio_out.h"
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#include "audio_out_internal.h"
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#include "afmt.h"
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#ifdef HAVE_DVB
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#include <ost/audio.h>
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audioMixer_t dvb_mixer={255,255};
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extern int vo_mpegpes_fd;
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extern int vo_mpegpes_fd2;
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#endif
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static ao_info_t info =
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{
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#ifdef HAVE_DVB
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"DVB audio output",
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#else
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"Mpeg-PES audio output",
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#endif
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"mpegpes",
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"A'rpi",
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""
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};
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LIBAO_EXTERN(mpegpes)
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// to set/get/query special features/parameters
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static int control(int cmd,int arg){
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#ifdef HAVE_DVB
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switch(cmd){
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case AOCONTROL_GET_VOLUME:
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if(vo_mpegpes_fd2>=0){
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((ao_control_vol_t*)(arg))->left=dvb_mixer.volume_left/2.56;
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((ao_control_vol_t*)(arg))->right=dvb_mixer.volume_right/2.56;
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return CONTROL_OK;
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}
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return CONTROL_ERROR;
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case AOCONTROL_SET_VOLUME:
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if(vo_mpegpes_fd2>=0){
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dvb_mixer.volume_left=((ao_control_vol_t)(arg)).left*2.56;
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dvb_mixer.volume_right=((ao_control_vol_t)(arg)).right*2.56;
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if(dvb_mixer.volume_left>255) dvb_mixer.volume_left=255;
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if(dvb_mixer.volume_right>255) dvb_mixer.volume_right=255;
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// printf("Setting DVB volume: %d ; %d \n",dvb_mixer.volume_left,dvb_mixer.volume_right);
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if ( (ioctl(vo_mpegpes_fd2,AUDIO_SET_MIXER, &dvb_mixer) < 0)){
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perror("DVB AUDIO SET MIXER: ");
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return CONTROL_ERROR;
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}
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return CONTROL_OK;
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}
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return CONTROL_ERROR;
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}
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#endif
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return CONTROL_UNKNOWN;
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}
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static int freq=0;
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static int freq_id=0;
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// open & setup audio device
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// return: 1=success 0=fail
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static int init(int rate,int channels,int format,int flags){
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ao_data.outburst=2000;
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ao_data.format=format;
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freq=rate;
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switch(rate){
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case 48000: freq_id=0;break;
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case 96000: freq_id=1;break;
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case 44100: freq_id=2;break;
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case 32000: freq_id=3;break;
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default:
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fprintf(stderr,"ao_mpegpes: %d Hz not supported, try to resample (RTFM)\n",rate);
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return 0;
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}
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return 1;
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}
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// close audio device
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static void uninit(){
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}
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// stop playing and empty buffers (for seeking/pause)
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static void reset(){
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}
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// stop playing, keep buffers (for pause)
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static void audio_pause()
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{
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// for now, just call reset();
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reset();
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}
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// resume playing, after audio_pause()
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static void audio_resume()
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{
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}
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void send_pes_packet(unsigned char* data,int len,int id,int timestamp);
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void send_lpcm_packet(unsigned char* data,int len,int id,int timestamp,int freq_id);
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extern int vo_pts;
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// return: how many bytes can be played without blocking
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static int get_space(){
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float x=(float)(vo_pts-ao_data.pts)/90000.0;
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int y;
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if(x<=0) return 0;
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y=freq*4*x;y/=ao_data.outburst;y*=ao_data.outburst;
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if(y>32000) y=32000;
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// printf("diff: %5.3f -> %d \n",x,y);
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return y;
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}
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// plays 'len' bytes of 'data'
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// it should round it down to outburst*n
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// return: number of bytes played
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static int play(void* data,int len,int flags){
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if(ao_data.format==AFMT_MPEG)
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send_pes_packet(data,len,0x1C0,ao_data.pts);
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else {
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int i;
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unsigned short *s=data;
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// if(len>2000) len=2000;
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// printf("ao_mpegpes: len=%d \n",len);
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for(i=0;i<len/2;i++) s[i]=(s[i]>>8)|(s[i]<<8); // le<->be
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send_lpcm_packet(data,len,0xA0,ao_data.pts,freq_id);
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}
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return len;
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}
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// return: delay in seconds between first and last sample in buffer
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static float get_delay(){
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return 0.0;
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}
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