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/*
Copyright (C) 2009 Red Hat, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "common.h"
#include "playback.h"
#include "utils.h"
#include "debug.h"
#define RING_SIZE_MS 160
#define START_MARK_MS 80
#define LOW_MARK_MS 40
WavePlayer::WavePlayer(uint32_t sampels_per_sec, uint32_t bits_per_sample, uint32_t channels)
: _wave_out (NULL)
, _sampels_per_ms (sampels_per_sec / 1000)
, _ring (NULL)
, _head (0)
, _in_use (0)
, _paused (true)
{
WAVEFORMATEX info;
uint32_t sample_bytes;
info.wFormatTag = WAVE_FORMAT_PCM;
info.nChannels = channels;
info.nSamplesPerSec = sampels_per_sec;
sample_bytes = info.nBlockAlign = channels * bits_per_sample / 8;
info.nAvgBytesPerSec = sampels_per_sec * info.nBlockAlign;
info.wBitsPerSample = bits_per_sample;
if (waveOutOpen(&_wave_out, WAVE_MAPPER, &info, NULL, NULL, CALLBACK_NULL)
!= MMSYSERR_NOERROR) {
throw Exception("can not open playback device");
}
int frame_size = WavePlaybackAbstract::FRAME_SIZE;
_ring_size = (sampels_per_sec * RING_SIZE_MS / 1000) / frame_size;
int low_mark = (sampels_per_sec * LOW_MARK_MS / 1000) / frame_size;
_start_mark = (sampels_per_sec * START_MARK_MS / 1000) / frame_size;
_frame_bytes = frame_size * channels * bits_per_sample / 8;
_ring_item_size = sizeof(WAVEHDR) + _frame_bytes + sample_bytes;
try {
_ring = new uint8_t[_ring_size * _ring_item_size];
init_ring(sample_bytes);
} catch (...) {
delete[] _ring;
waveOutClose(_wave_out);
throw;
}
waveOutPause(_wave_out);
}
WavePlayer::~WavePlayer()
{
waveOutReset(_wave_out);
reclaim();
waveOutClose(_wave_out);
delete[] _ring;
}
void WavePlayer::init_ring(uint32_t sample_bytes)
{
uint8_t* ptr = _ring;
uint8_t* end = ptr + _ring_size * _ring_item_size;
for (; ptr != end; ptr += _ring_item_size) {
WAVEHDR* buf = (WAVEHDR*)ptr;
memset(ptr, 0, _ring_item_size);
buf->dwBufferLength = _frame_bytes;
ULONG_PTR ptr = (ULONG_PTR)(buf + 1);
ptr = (ptr + sample_bytes - 1) / sample_bytes * sample_bytes;
buf->lpData = (LPSTR)ptr;
}
}
inline WAVEHDR* WavePlayer::wave_hader(uint32_t position)
{
ASSERT(position < _ring_size);
return (WAVEHDR*)(_ring + position * _ring_item_size);
}
inline void WavePlayer::move_head()
{
_head = (_head + 1) % _ring_size;
_in_use--;
}
void WavePlayer::reclaim()
{
while (_in_use) {
WAVEHDR* front_buf = wave_hader(_head);
if (!(front_buf->dwFlags & WHDR_DONE)) {
break;
}
MMRESULT err = waveOutUnprepareHeader(_wave_out, front_buf, sizeof(WAVEHDR));
if (err != MMSYSERR_NOERROR) {
LOG_WARN("waveOutUnprepareHeader failed %u", err);
}
front_buf->dwFlags &= ~WHDR_DONE;
move_head();
}
}
WAVEHDR* WavePlayer::get_buff()
{
reclaim();
if (_in_use == _ring_size) {
return NULL;
}
WAVEHDR* buff = wave_hader((_head + _in_use) % _ring_size);
++_in_use;
return buff;
}
bool WavePlayer::write(uint8_t* frame)
{
WAVEHDR* buff = get_buff();
if (buff) {
memcpy(buff->lpData, frame, _frame_bytes);
MMRESULT err;
err = waveOutPrepareHeader(_wave_out, buff, sizeof(WAVEHDR));
if (err != MMSYSERR_NOERROR) {
THROW("waveOutPrepareHeader filed %d", err);
}
err = waveOutWrite(_wave_out, buff, sizeof(WAVEHDR));
if (err != MMSYSERR_NOERROR) {
THROW("waveOutWrite filed %d", err);
}
}
if (_paused && _in_use == _start_mark) {
_paused = false;
waveOutRestart(_wave_out);
}
return true;
}
void WavePlayer::drain()
{
}
void WavePlayer::stop()
{
drain();
waveOutReset(_wave_out);
waveOutPause(_wave_out);
_paused = true;
reclaim();
}
bool WavePlayer::abort()
{
return true;
}
uint32_t WavePlayer::get_delay_ms()
{
return _in_use * WavePlaybackAbstract::FRAME_SIZE / _sampels_per_ms;
}
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