mirror of https://github.com/mpv-player/mpv
267 lines
6.2 KiB
C
267 lines
6.2 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 <unistd.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <sys/soundcard.h>
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#include "../config.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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extern int verbose;
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static ao_info_t info =
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{
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"OSS/ioctl audio output",
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"oss",
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"A'rpi",
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""
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};
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LIBAO_EXTERN(oss)
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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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static char *dsp="/dev/dsp";
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static audio_buf_info zz;
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static int audio_fd=-1;
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char *oss_mixer_device = "/dev/mixer";
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int oss_mixer_usemaster = 0;
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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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switch(cmd){
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case AOCONTROL_SET_DEVICE:
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dsp=(char*)arg;
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return CONTROL_OK;
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case AOCONTROL_QUERY_FORMAT:
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return CONTROL_TRUE;
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case AOCONTROL_GET_VOLUME:
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case AOCONTROL_SET_VOLUME:
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{
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ao_control_vol_t *vol = (ao_control_vol_t *)arg;
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int fd, v, mcmd, devs;
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if ((fd = open("/dev/mixer", O_RDONLY)) > 0)
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{
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ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
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if ((devs & SOUND_MASK_PCM) && (oss_mixer_usemaster == 0))
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if (cmd == AOCONTROL_GET_VOLUME)
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mcmd = SOUND_MIXER_READ_PCM;
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else
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mcmd = SOUND_MIXER_WRITE_PCM;
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else if ((devs & SOUND_MASK_VOLUME) && (oss_mixer_usemaster == 1))
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if (cmd == AOCONTROL_GET_VOLUME)
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mcmd = SOUND_MIXER_READ_VOLUME;
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else
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mcmd = SOUND_MIXER_WRITE_VOLUME;
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else
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{
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close(fd);
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return CONTROL_ERROR;
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}
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if (cmd == AOCONTROL_GET_VOLUME)
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{
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ioctl(fd, cmd, &v);
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vol->right = (v & 0xFF00) >> 8;
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vol->left = v & 0x00FF;
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}
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else
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{
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v = ((int)vol->right << 8) | (int)vol->left;
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ioctl(fd, cmd, &v);
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}
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close(fd);
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return CONTROL_OK;
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}
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else
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return CONTROL_ERROR;
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}
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return CONTROL_ERROR;
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default:
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}
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return CONTROL_UNKNOWN;
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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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printf("ao2: %d Hz %d chans %s\n",rate,channels,
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audio_out_format_name(format));
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if (ao_subdevice)
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dsp = ao_subdevice;
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if (verbose)
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printf("audio_setup: using '%s' dsp device\n", dsp);
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audio_fd=open(dsp, O_WRONLY);
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if(audio_fd<0){
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printf("Can't open audio device %s -> nosound\n",dsp);
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return 0;
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}
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ao_format=format;
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ioctl (audio_fd, SNDCTL_DSP_SETFMT, &ao_format);
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printf("audio_setup: sample format: %s (requested: %s)\n",
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audio_out_format_name(ao_format), audio_out_format_name(format));
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ao_channels=channels-1;
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ioctl (audio_fd, SNDCTL_DSP_STEREO, &ao_channels);
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// set rate
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ao_samplerate=rate;
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ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_samplerate);
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printf("audio_setup: using %d Hz samplerate (requested: %d)\n",ao_samplerate,rate);
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if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)==-1){
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int r=0;
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printf("audio_setup: driver doesn't support SNDCTL_DSP_GETOSPACE :-(\n");
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if(ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &r)==-1){
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printf("audio_setup: %d bytes/frag (config.h)\n",ao_outburst);
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} else {
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ao_outburst=r;
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printf("audio_setup: %d bytes/frag (GETBLKSIZE)\n",ao_outburst);
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}
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} else {
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printf("audio_setup: frags: %3d/%d (%d bytes/frag) free: %6d\n",
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zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
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if(ao_buffersize==-1) ao_buffersize=zz.bytes;
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ao_outburst=zz.fragsize;
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}
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if(ao_buffersize==-1){
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// Measuring buffer size:
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void* data;
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ao_buffersize=0;
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#ifdef HAVE_AUDIO_SELECT
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data=malloc(ao_outburst); memset(data,0,ao_outburst);
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while(ao_buffersize<0x40000){
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fd_set rfds;
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struct timeval tv;
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FD_ZERO(&rfds); FD_SET(audio_fd,&rfds);
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tv.tv_sec=0; tv.tv_usec = 0;
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if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) break;
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write(audio_fd,data,ao_outburst);
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ao_buffersize+=ao_outburst;
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}
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free(data);
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if(ao_buffersize==0){
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printf("\n *** Your audio driver DOES NOT support select() ***\n");
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printf("Recompile mplayer with #undef HAVE_AUDIO_SELECT in config.h !\n\n");
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return 0;
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}
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#endif
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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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#ifdef SNDCTL_DSP_RESET
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ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
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#endif
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close(audio_fd);
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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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uninit();
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audio_fd=open(dsp, O_WRONLY);
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if(audio_fd<0){
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printf("\nFatal error: *** CANNOT RE-OPEN / RESET AUDIO DEVICE ***\n");
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return;
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}
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ioctl (audio_fd, SNDCTL_DSP_SETFMT, &ao_format);
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ioctl (audio_fd, SNDCTL_DSP_STEREO, &ao_channels);
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ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_samplerate);
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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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// return: how many bytes can be played without blocking
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static int get_space(){
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int playsize=ao_outburst;
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#ifdef SNDCTL_DSP_GETOSPACE
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if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1){
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// calculate exact buffer space:
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return zz.fragments*zz.fragsize;
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}
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#endif
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// check buffer
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#ifdef HAVE_AUDIO_SELECT
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{ fd_set rfds;
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struct timeval tv;
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FD_ZERO(&rfds);
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FD_SET(audio_fd, &rfds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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if(!select(audio_fd+1, NULL, &rfds, NULL, &tv)) return 0; // not block!
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}
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#endif
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return ao_outburst;
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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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len/=ao_outburst;
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len=write(audio_fd,data,len*ao_outburst);
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return len;
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}
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static int audio_delay_method=2;
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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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if(audio_delay_method==2){
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//
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int r=0;
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if(ioctl(audio_fd, SNDCTL_DSP_GETODELAY, &r)!=-1)
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return r;
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audio_delay_method=1; // fallback if not supported
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}
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if(audio_delay_method==1){
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// SNDCTL_DSP_GETOSPACE
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if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1)
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return ao_buffersize-zz.bytes;
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audio_delay_method=0; // fallback if not supported
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}
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return ao_buffersize;
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}
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