first init of 0.9
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cnjinhao
237
source/audio/detail/audio_device.cpp
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237
source/audio/detail/audio_device.cpp
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#include <nana/audio/detail/audio_device.hpp>
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#include <nana/system/platform.hpp>
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#if defined(NANA_LINUX)
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#include <pthread.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <errno.h>
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#endif
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namespace nana{namespace audio
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{
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namespace detail
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{
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#if defined(NANA_WINDOWS)
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class wave_native
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{
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typedef MMRESULT (__stdcall *out_open_t)(LPHWAVEOUT, UINT_PTR, LPWAVEFORMATEX, DWORD_PTR, DWORD_PTR, DWORD);
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typedef MMRESULT (__stdcall *out_close_t)(HWAVEOUT);
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typedef MMRESULT (__stdcall *out_op_header_t)(HWAVEOUT, LPWAVEHDR, UINT);
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public:
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out_open_t out_open;
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out_close_t out_close;
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out_op_header_t out_write;
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out_op_header_t out_prepare;
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out_op_header_t out_unprepare;
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wave_native()
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{
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HMODULE winmm = ::GetModuleHandleA("Winmm.DLL");
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if(0 == winmm)
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winmm = ::LoadLibraryA("Winmm.DLL");
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out_open = reinterpret_cast<out_open_t>(::GetProcAddress(winmm, "waveOutOpen"));
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out_close = reinterpret_cast<out_close_t>(::GetProcAddress(winmm, "waveOutClose"));
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out_write = reinterpret_cast<out_op_header_t>(::GetProcAddress(winmm, "waveOutWrite"));
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out_prepare = reinterpret_cast<out_op_header_t>(::GetProcAddress(winmm, "waveOutPrepareHeader"));
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out_unprepare = reinterpret_cast<out_op_header_t>(::GetProcAddress(winmm, "waveOutUnprepareHeader"));
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}
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}wave_native_if;
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#endif
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//class audio_device
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audio_device::audio_device()
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#if defined(NANA_WINDOWS)
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: handle_(nullptr), buf_prep_(nullptr)
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#elif defined(NANA_LINUX)
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: handle_(nullptr), buf_prep_(nullptr)
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#endif
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{}
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audio_device::~audio_device()
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{
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close();
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}
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bool audio_device::empty() const
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{
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return (nullptr == handle_);
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}
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bool audio_device::open(std::size_t channels, std::size_t rate, std::size_t bits_per_sample)
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{
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#if defined(NANA_WINDOWS)
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close();
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WAVEFORMATEX wfx;
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wfx.wFormatTag = WAVE_FORMAT_PCM;
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wfx.nChannels = static_cast<WORD>(channels);
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wfx.nSamplesPerSec = static_cast<DWORD>(rate);
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wfx.wBitsPerSample = static_cast<WORD>(bits_per_sample);
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wfx.nBlockAlign = (wfx.wBitsPerSample >> 3 ) * wfx.nChannels;
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wfx.nAvgBytesPerSec = wfx.nBlockAlign * wfx.nSamplesPerSec;
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wfx.cbSize = 0;
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MMRESULT mmr = wave_native_if.out_open(&handle_, WAVE_MAPPER, &wfx, reinterpret_cast<DWORD_PTR>(&audio_device::_m_dev_callback), reinterpret_cast<DWORD_PTR>(this), CALLBACK_FUNCTION);
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return (mmr == MMSYSERR_NOERROR);
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#elif defined(NANA_LINUX)
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if(nullptr == handle_)
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{
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if(::snd_pcm_open(&handle_, "plughw:0,0", SND_PCM_STREAM_PLAYBACK, 0) < 0)
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return false;
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}
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if(handle_)
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{
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channels_ = channels;
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rate_ = rate;
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bytes_per_sample_ = (bits_per_sample >> 3);
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bytes_per_frame_ = bytes_per_sample_ * channels;
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snd_pcm_hw_params_t * params;
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if(snd_pcm_hw_params_malloc(¶ms) < 0)
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{
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close();
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return false;
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}
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if(::snd_pcm_hw_params_any(handle_, params) < 0)
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{
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close();
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::snd_pcm_hw_params_free(params);
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return false;
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}
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if(::snd_pcm_hw_params_set_access(handle_, params, SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
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{
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close();
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::snd_pcm_hw_params_free(params);
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return false;
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}
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snd_pcm_format_t format = SND_PCM_FORMAT_U8;
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switch(bits_per_sample)
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{
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case 8:
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format = SND_PCM_FORMAT_U8; break;
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case 16:
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format = SND_PCM_FORMAT_S16_LE; break;
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case 32:
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format = SND_PCM_FORMAT_S32_LE; break;
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}
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if(::snd_pcm_hw_params_set_format(handle_, params, format) < 0)
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{
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close();
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::snd_pcm_hw_params_free(params);
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return false;
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}
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unsigned tmp = rate;
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if(::snd_pcm_hw_params_set_rate_near(handle_, params, &tmp, 0) < 0)
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{
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close();
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::snd_pcm_hw_params_free(params);
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return false;
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}
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if(::snd_pcm_hw_params_set_channels(handle_, params, channels) < 0)
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{
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close();
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::snd_pcm_hw_params_free(params);
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return false;
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}
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if(::snd_pcm_hw_params(handle_, params) < 0)
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{
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close();
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::snd_pcm_hw_params_free(params);
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return false;
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}
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::snd_pcm_hw_params_free(params);
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::snd_pcm_prepare(handle_);
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return true;
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}
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return false;
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#endif
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}
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void audio_device::close()
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{
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if(handle_)
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{
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#if defined(NANA_WINDOWS)
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wave_native_if.out_close(handle_);
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#elif defined(NANA_LINUX)
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::snd_pcm_close(handle_);
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#endif
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handle_ = nullptr;
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}
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}
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void audio_device::prepare(buffer_preparation & buf_prep)
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{
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buf_prep_ = & buf_prep;
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}
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void audio_device::write(buffer_preparation::meta * m)
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{
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#if defined(NANA_WINDOWS)
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std::lock_guard<decltype(queue_lock_)> lock(queue_lock_);
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done_queue_.push_back(m);
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if(m->dwFlags & WHDR_PREPARED)
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wave_native_if.out_unprepare(handle_, m, sizeof(WAVEHDR));
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wave_native_if.out_prepare(handle_, m, sizeof(WAVEHDR));
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wave_native_if.out_write(handle_, m, sizeof(WAVEHDR));
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#elif defined(NANA_LINUX)
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std::size_t frames = m->bufsize / bytes_per_frame_;
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std::size_t buffered = 0; //in bytes
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while(frames > 0)
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{
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int err = ::snd_pcm_writei(handle_, m->buf + buffered, frames);
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if(err > 0)
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{
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frames -= err;
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buffered += err * bytes_per_frame_;
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}
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else if(-EPIPE == err)
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::snd_pcm_prepare(handle_);
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}
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buf_prep_->revert(m);
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#endif
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}
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void audio_device::wait_for_drain() const
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{
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#if defined(NANA_WINDOWS)
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while(buf_prep_->data_finished() == false)
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nana::system::sleep(200);
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#elif defined(NANA_LINUX)
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while(::snd_pcm_state(handle_) == SND_PCM_STATE_RUNNING)
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nana::system::sleep(200);
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#endif
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}
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#if defined(NANA_WINDOWS)
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void __stdcall audio_device::_m_dev_callback(HWAVEOUT handle, UINT msg, audio_device * self, DWORD_PTR, DWORD_PTR)
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{
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if(WOM_DONE == msg)
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{
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buffer_preparation::meta * m;
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{
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std::lock_guard<decltype(queue_lock_)> lock(self->queue_lock_);
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m = self->done_queue_.front();
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self->done_queue_.erase(self->done_queue_.begin());
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}
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wave_native_if.out_unprepare(handle, m, sizeof(WAVEHDR));
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self->buf_prep_->revert(m);
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}
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}
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#endif
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//end class audio_device
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}//end namespace detail
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}//end namespace audio
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}//end namespace nana
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