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/*
Copyright (C) 2009 Red Hat, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "record.h"
#include "utils.h"
#include "debug.h"
class WaveRecorder::EventTrigger: public EventSources::File {
public:
EventTrigger(WaveRecorder& recorder, int fd);
virtual void on_event();
virtual int get_fd() { return _fd;}
private:
WaveRecorder& _recorder;
int _fd;
};
WaveRecorder::EventTrigger::EventTrigger(WaveRecorder& recorder, int fd)
: _recorder (recorder)
, _fd (fd)
{
}
void WaveRecorder::EventTrigger::on_event()
{
_recorder.on_event();
}
WaveRecorder::WaveRecorder(Platform::RecordClient& client,
uint32_t sampels_per_sec,
uint32_t bits_per_sample,
uint32_t channels)
: _client (client)
, _pcm (NULL)
, _hw_params (NULL)
, _sw_params (NULL)
, _sample_bytes (bits_per_sample * channels / 8)
, _frame (new uint8_t[_sample_bytes * WaveRecordAbstract::FRAME_SIZE])
, _frame_pos (_frame)
, _frame_end (_frame + _sample_bytes * WaveRecordAbstract::FRAME_SIZE)
, _event_trigger (NULL)
{
if (!init(sampels_per_sec, bits_per_sample, channels)) {
cleanup();
THROW("failed");
}
}
WaveRecorder::~WaveRecorder()
{
cleanup();
delete[] _frame;
}
void WaveRecorder::cleanup()
{
if (_event_trigger) {
_client.remove_event_source(*_event_trigger);
delete _event_trigger;
}
if (_sw_params) {
snd_pcm_sw_params_free(_sw_params);
}
if (_hw_params) {
snd_pcm_hw_params_free(_hw_params);
}
if (_pcm) {
snd_pcm_close(_pcm);
}
}
bool WaveRecorder::init(uint32_t sampels_per_sec,
uint32_t bits_per_sample,
uint32_t channels)
{
const int frame_size = WaveRecordAbstract::FRAME_SIZE;
const char* pcm_device = "hw:0,0"; // "default" ???
snd_pcm_format_t format;
int err;
switch (bits_per_sample) {
case 8:
format = SND_PCM_FORMAT_S8;
break;
case 16:
format = SND_PCM_FORMAT_S16_LE;
break;
default:
return false;
}
if ((err = snd_pcm_open(&_pcm, pcm_device, SND_PCM_STREAM_CAPTURE, SND_PCM_NONBLOCK)) < 0) {
LOG_ERROR("cannot open audio record device %s %s", pcm_device, snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_malloc(&_hw_params)) < 0) {
LOG_ERROR("cannot allocate hardware parameter structure %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_sw_params_malloc(&_sw_params)) < 0) {
LOG_ERROR("cannot allocate software parameter structure %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_any(_pcm, _hw_params)) < 0) {
LOG_ERROR("cannot initialize hardware parameter structure %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_rate_resample(_pcm, _hw_params, 1)) < 0) {
LOG_ERROR("cannot set rate resample %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_access(_pcm, _hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
LOG_ERROR("cannot set access type %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_rate(_pcm, _hw_params, sampels_per_sec, 0)) < 0) {
LOG_ERROR("cannot set sample rate %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_channels(_pcm, _hw_params, channels)) < 0) {
LOG_ERROR("cannot set channel count %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params_set_format(_pcm, _hw_params, format)) < 0) {
LOG_ERROR("cannot set sample format %s", snd_strerror(err));
return false;
}
int direction = 0;
snd_pcm_uframes_t buffer_size = (sampels_per_sec * 160 / 1000) / frame_size * frame_size;
if ((err = snd_pcm_hw_params_set_buffer_size_near(_pcm, _hw_params, &buffer_size)) < 0) {
LOG_ERROR("cannot set buffer size %s", snd_strerror(err));
return false;
}
snd_pcm_uframes_t period_size = frame_size;
if ((err = snd_pcm_hw_params_set_period_size_near(_pcm, _hw_params, &period_size,
&direction)) < 0) {
LOG_ERROR("cannot set period size near %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_hw_params(_pcm, _hw_params)) < 0) {
LOG_ERROR("cannot set parameters %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_sw_params_current(_pcm, _sw_params)) < 0) {
LOG_ERROR("cannot get current sw parameters %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_sw_params_set_start_threshold(_pcm, _sw_params, frame_size)) < 0) {
LOG_ERROR("cannot set start threshold %s", snd_strerror(err));
return false;
}
if ((err = snd_pcm_sw_params(_pcm, _sw_params)) < 0) {
LOG_ERROR("cannot set sw parameters %s", snd_strerror(err));
return false;
}
struct pollfd pfd;
if ((err = snd_pcm_poll_descriptors(_pcm, &pfd, 1)) < 0) {
LOG_ERROR("cannot get poll ID %s", snd_strerror(err));
return false;
}
_event_trigger = new WaveRecorder::EventTrigger(*this, pfd.fd);
_client.add_event_source(*_event_trigger);
return true;
}
void WaveRecorder::start()
{
_frame_pos = _frame;
snd_pcm_prepare(_pcm);
snd_pcm_start(_pcm);
snd_pcm_nonblock(_pcm, 1);
}
void WaveRecorder::stop()
{
snd_pcm_drop(_pcm);
snd_pcm_prepare(_pcm);
}
bool WaveRecorder::abort()
{
return true;
}
void WaveRecorder::on_event()
{
for (;;) {
snd_pcm_sframes_t size = (_frame_end - _frame_pos) / _sample_bytes;
size = snd_pcm_readi(_pcm, _frame_pos, size);
if (size < 0) {
if (snd_pcm_recover(_pcm, size, 1) == 0) {
continue;
}
return;
}
_frame_pos += size * _sample_bytes;
if (_frame_pos == _frame_end) {
_client.push_frame(_frame);
_frame_pos = _frame;
}
}
}
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