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#include <algorithm>
#include <string>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <alsa/asoundlib.h>
#include "device_alsa.h"
#include "debug.h"
namespace audiere {
static snd_pcm_t* openDevice(const std::string &name,
unsigned int rate) {
int status = 0;
snd_pcm_t* pcm_handle = 0;
status = snd_pcm_open(&pcm_handle, name.c_str (),
SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
if (status < 0) {
ADR_LOG("Coudn't open haredware.");
return 0;
}
snd_pcm_hw_params_t* hwparams;
snd_pcm_sw_params_t* swparams;
snd_pcm_hw_params_alloca(&hwparams);
snd_pcm_sw_params_alloca(&swparams);
status = snd_pcm_hw_params_any(pcm_handle, hwparams);
if (status < 0) {
ADR_LOG("Coudn't get hardware parameters.");
snd_pcm_close(pcm_handle);
return 0;
}
status = snd_pcm_hw_params_set_access(pcm_handle, hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED);
if (status < 0) {
ADR_LOG("Coudn't set access mode.");
snd_pcm_close(pcm_handle);
return 0;
}
status = snd_pcm_hw_params_set_format(pcm_handle, hwparams,
SND_PCM_FORMAT_S16_LE);
if (status < 0) {
ADR_LOG("Coudn't set pcm format.");
snd_pcm_close(pcm_handle);
return 0;
}
unsigned int channels = 2;
status = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams,
&channels);
if (status < 0) {
ADR_LOG("Coudn't set channels.");
snd_pcm_close(pcm_handle);
return 0;
}
status = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams,
&rate, NULL);
if (status < 0) {
ADR_LOG("Coudn't set sample rate.");
snd_pcm_close(pcm_handle);
return 0;
}
snd_pcm_uframes_t frame_size = 1024;
status = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams,
&frame_size, NULL);
if (status < 0) {
ADR_LOG("Coudn't set buffer size.");
snd_pcm_close(pcm_handle);
return 0;
}
unsigned frames = 8;
status = snd_pcm_hw_params_set_periods_near(pcm_handle, hwparams,
&frames, NULL);
if (status < 0) {
ADR_LOG("Coudn't set periods.");
snd_pcm_close(pcm_handle);
return 0;
}
status = snd_pcm_hw_params(pcm_handle, hwparams);
if (status < 0) {
ADR_LOG("Coudn't set hardware parameters.");
snd_pcm_close(pcm_handle);
return 0;
}
snd_pcm_uframes_t buffer_size;
status = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
if (status < 0) {
ADR_LOG("Coudn't get buffer size.");
snd_pcm_close(pcm_handle);
return 0;
}
snd_pcm_uframes_t period_size;
status = snd_pcm_hw_params_get_period_size(hwparams, &period_size, NULL);
if (status < 0) {
ADR_LOG("Coudn't get period size.");
snd_pcm_close(pcm_handle);
return 0;
}
status = snd_pcm_sw_params_current(pcm_handle, swparams);
if (status < 0) {
ADR_LOG("Coudn't get software parameters.");
snd_pcm_close(pcm_handle);
return 0;
}
snd_pcm_uframes_t boundary;
#if SND_LIB_VERSION >= 0x000901
status = snd_pcm_sw_params_get_boundary(swparams, &boundary);
if (status < 0) {
ADR_LOG("Coudn't get boundary.");
snd_pcm_close(pcm_handle);
return 0;
}
#else
boundary = 0x7fffffff;
#endif
status = snd_pcm_sw_params_set_start_threshold(pcm_handle, swparams,
period_size);
if (status < 0) {
ADR_LOG("Coudn't get hardware parameters.");
snd_pcm_close(pcm_handle);
return 0;
}
status = snd_pcm_sw_params_set_stop_threshold(pcm_handle, swparams,
boundary);
if (status < 0) {
ADR_LOG("Coudn't set stop threshold.");
snd_pcm_close(pcm_handle);
return 0;
}
#if SND_LIB_VERSION >= 0x000901
status = snd_pcm_sw_params_set_silence_size(pcm_handle, swparams,
boundary);
if (status < 0) {
ADR_LOG("Coudn't set silence size.");
snd_pcm_close(pcm_handle);
return 0;
}
#endif
status = snd_pcm_sw_params(pcm_handle, swparams);
if (status < 0) {
ADR_LOG("Couldn't set audio device parameters.");
snd_pcm_close(pcm_handle);
return 0;
}
return pcm_handle;
}
ALSAAudioDevice*
ALSAAudioDevice::create(const ParameterList& parameters) {
std::string devices[] = {
"default", "plughw:0,0", "hw:0,0", ""
};
std::string default_device = parameters.getValue("device", devices[0].c_str());
if (default_device != devices[0])
devices[0] = default_device;
int i, rate;
snd_pcm_t* pcm_handle = 0;
for (i = 0; devices[i].length() > 0; i++) {
rate = 48000;
pcm_handle = openDevice(devices[i], rate);
if (!pcm_handle) {
rate = 44100;
pcm_handle = openDevice(devices[i], rate);
}
if (pcm_handle)
break;
}
if (!pcm_handle) {
ADR_LOG("Coudn't open haredware.");
return 0;
}
return new ALSAAudioDevice(pcm_handle, devices[i], rate, 4096);
}
ALSAAudioDevice::ALSAAudioDevice(snd_pcm_t* pcm_handle,
const std::string &name,
int rate,
int buffer_size)
: MixerDevice(rate), m_pcm_name(name), m_rate(rate)
{
m_pcm_handle = pcm_handle;
m_buffer_size = buffer_size;
m_buffer = new char [buffer_size];
}
ALSAAudioDevice::~ALSAAudioDevice() {
ADR_GUARD("ALSAAudioDevice::~ALSAAudioDevice");
if (m_pcm_handle) {
snd_pcm_drain(m_pcm_handle);
snd_pcm_close(m_pcm_handle);
}
delete [] m_buffer;
}
void ADR_CALL
ALSAAudioDevice::update() {
int ret;
int sample_len;
int sample_left;
char* sample_buf;
int retry = 0;
// reopen a pcm
if (!m_pcm_handle) {
m_pcm_handle = openDevice(m_pcm_name, m_rate);
if (!m_pcm_handle) {
usleep(100);
return;
}
}
sample_buf = m_buffer;
sample_len = m_buffer_size / 4;
sample_left = read(sample_len, sample_buf);
while (sample_left > 0 && m_pcm_handle) {
ret = snd_pcm_writei(m_pcm_handle, sample_buf, sample_left);
if (ret == -EAGAIN) {
snd_pcm_wait(m_pcm_handle, 1000);
if (++retry > 5) {
snd_pcm_close(m_pcm_handle);
m_pcm_handle = 0;
break;
}
} else if (ret == -ESTRPIPE) {
do {
snd_pcm_wait(m_pcm_handle, 10);
ret = snd_pcm_resume(m_pcm_handle);
} while (ret == -EAGAIN);
snd_pcm_prepare(m_pcm_handle);
} else if (ret == -EPIPE) {
snd_pcm_prepare(m_pcm_handle);
}
if (ret > 0) {
sample_buf += ret * 4;
sample_left -= ret;
}
}
}
const char* ADR_CALL
ALSAAudioDevice::getName() {
return "alsa";
}
}
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