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player, receiver

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git-svn-id: svn://elaine/murooma/trunk@208 d8a302eb-03bc-478d-80e4-98257eca68ef
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(no author) 2014-08-23 23:00:07 +00:00
parent 746933a96a
commit 10323c0485
12 changed files with 307 additions and 309 deletions
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122
client/player.cpp Normal file
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#include "player.h"
#include <alsa/asoundlib.h>
#include <iostream>
#define PCM_DEVICE "default"
using namespace std;
Player::Player(Stream* stream) : active_(false), stream_(stream)
{
}
void Player::start()
{
unsigned int pcm, tmp, rate;
int channels;
snd_pcm_hw_params_t *params;
int buff_size;
rate = stream_->format.rate;
channels = stream_->format.channels;
/* Open the PCM device in playback mode */
if ((pcm = snd_pcm_open(&pcm_handle, PCM_DEVICE, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
cout << "ERROR: Can't open " << PCM_DEVICE << " PCM device. " << snd_strerror(pcm) << "\n";
/* struct snd_pcm_playback_info_t pinfo;
if ( (pcm = snd_pcm_playback_info( pcm_handle, &pinfo )) < 0 )
fprintf( stderr, "Error: playback info error: %s\n", snd_strerror( err ) );
printf("buffer: '%d'\n", pinfo.buffer_size);
*/
/* Allocate parameters object and fill it with default values*/
snd_pcm_hw_params_alloca(&params);
snd_pcm_hw_params_any(pcm_handle, params);
/* Set parameters */
if ((pcm = snd_pcm_hw_params_set_access(pcm_handle, params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
cout << "ERROR: Can't set interleaved mode. " << snd_strerror(pcm) << "\n";
if ((pcm = snd_pcm_hw_params_set_format(pcm_handle, params, SND_PCM_FORMAT_S16_LE)) < 0)
cout << "ERROR: Can't set format. " << snd_strerror(pcm) << "\n";
if ((pcm = snd_pcm_hw_params_set_channels(pcm_handle, params, channels)) < 0)
cout << "ERROR: Can't set channels number. " << snd_strerror(pcm) << "\n";
if ((pcm = snd_pcm_hw_params_set_rate_near(pcm_handle, params, &rate, 0)) < 0)
cout << "ERROR: Can't set rate. " << snd_strerror(pcm) << "\n";
long unsigned int periodsize = 2*rate/50;
if ((pcm = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, params, &periodsize)) < 0)
cout << "Unable to set buffer size " << (long int)periodsize << ": " << snd_strerror(pcm) << "\n";
/* Write parameters */
if ((pcm = snd_pcm_hw_params(pcm_handle, params)) < 0)
cout << "ERROR: Can't set harware parameters. " << snd_strerror(pcm) << "\n";
/* Resume information */
cout << "PCM name: " << snd_pcm_name(pcm_handle) << "\n";
cout << "PCM state: " << snd_pcm_state_name(snd_pcm_state(pcm_handle)) << "\n";
snd_pcm_hw_params_get_channels(params, &tmp);
cout << "channels: " << tmp << "\n";
if (tmp == 1)
printf("(mono)\n");
else if (tmp == 2)
printf("(stereo)\n");
snd_pcm_hw_params_get_rate(params, &tmp, 0);
cout << "rate: " << tmp << " bps\n";
/* Allocate buffer to hold single period */
snd_pcm_hw_params_get_period_size(params, &frames, 0);
cout << "frames: " << frames << "\n";
buff_size = frames * channels * 2 /* 2 -> sample size */;
buff = (char *) malloc(buff_size);
snd_pcm_hw_params_get_period_time(params, &tmp, NULL);
cout << "period time: " << tmp << "\n";
playerThread = new thread(&Player::worker, this);
}
void Player::stop()
{
active_ = false;
}
void Player::worker()
{
unsigned int pcm;
active_ = true;
while (active_)
{
snd_pcm_sframes_t avail;
snd_pcm_sframes_t delay;
snd_pcm_avail_delay(pcm_handle, &avail, &delay);
stream_->getPlayerChunk(buff, (float)delay / stream_->format.msRate(), frames);
if ((pcm = snd_pcm_writei(pcm_handle, buff, frames)) == -EPIPE) {
printf("XRUN.\n");
snd_pcm_prepare(pcm_handle);
} else if (pcm < 0) {
printf("ERROR. Can't write to PCM device. %s\n", snd_strerror(pcm));
}
}
snd_pcm_drain(pcm_handle);
snd_pcm_close(pcm_handle);
free(buff);
}