mirror of https://github.com/mpv-player/mpv
99 lines
1.8 KiB
C
99 lines
1.8 KiB
C
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#include <stdio.h>
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#include <stdlib.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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static ao_info_t info =
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{
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"mpeg-pes audio output",
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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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// there are some globals:
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// ao_samplerate
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// ao_channels
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// ao_format
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// ao_bps
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// ao_outburst
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// ao_buffersize
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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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return -1;
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}
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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_outburst=2000;
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ao_format=format;
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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);
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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_pts)/90000.0-0.5;
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int y;
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if(x<=0) return 0;
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y=48000*4*x;y/=ao_outburst;y*=ao_outburst;
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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_format==AFMT_MPEG)
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send_pes_packet(data,len,0x1C0,ao_pts);
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else {
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int i;
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unsigned short *s=data;
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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_pts);
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}
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return len;
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}
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// return: how many unplayed bytes are in the buffer
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static int get_delay(){
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return 0;
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}
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