144 lines
3.8 KiB
C++
144 lines
3.8 KiB
C++
/*
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*******************************************************************************
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* INCLUDE
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*******************************************************************************
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*/
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#include "PCM.h"
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#include <alsa/asoundlib.h>
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#include <iostream>
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namespace Video
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{
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namespace ALSA
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{
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/*
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*******************************************************************************
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* CLASS DEFINE
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*******************************************************************************
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*/
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PCM::PCM()
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{
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}
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PCM::~PCM()
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{
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}
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int PCM::open(SoundCard::Ptr pSoundCard, snd_pcm_stream_t stream)
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{
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_stream = stream;
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return snd_pcm_open((snd_pcm_t**)&_pPCM, pSoundCard->info().device.c_str(), stream, 0);
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}
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int PCM::close()
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{
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snd_pcm_drain((snd_pcm_t*)_pPCM);
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snd_pcm_close((snd_pcm_t*)_pPCM);
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return 0;
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}
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int PCM::config(snd_pcm_access_t access, snd_pcm_format_t format, int channels, int rate, int framesz, int samplesz)
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{
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#define __check_error(x) \
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rc = x; \
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if (rc < 0) \
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{ \
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std::cout << "Error: " << snd_strerror(rc) << "@" << #x << std::endl; \
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goto out; \
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}
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snd_pcm_hw_params_t* hwParams = nullptr;
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snd_pcm_sw_params_t* swParams = nullptr;
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int rc;
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__check_error(snd_pcm_hw_params_malloc(&hwParams));
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__check_error(snd_pcm_hw_params_any((snd_pcm_t*)_pPCM, hwParams));
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__check_error(snd_pcm_hw_params_set_access((snd_pcm_t*)_pPCM, hwParams, access));
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__check_error(snd_pcm_hw_params_set_format((snd_pcm_t*)_pPCM, hwParams, format));
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__check_error(snd_pcm_hw_params_set_channels((snd_pcm_t*)_pPCM, hwParams, channels));
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__check_error(snd_pcm_hw_params_set_rate((snd_pcm_t*)_pPCM, hwParams, rate, 0));
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__check_error(snd_pcm_hw_params_set_period_size((snd_pcm_t*)_pPCM, hwParams, framesz, 0));
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__check_error(snd_pcm_hw_params_set_periods((snd_pcm_t*)_pPCM, hwParams, samplesz, 0));
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__check_error(snd_pcm_hw_params_set_buffer_size((snd_pcm_t*)_pPCM, hwParams, samplesz * framesz));
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__check_error(snd_pcm_hw_params((snd_pcm_t*)_pPCM, hwParams));
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if (_stream == SND_PCM_STREAM_PLAYBACK)
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{
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__check_error(snd_pcm_sw_params_malloc(&swParams));
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__check_error(snd_pcm_sw_params_current((snd_pcm_t*)_pPCM, swParams));
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__check_error(snd_pcm_sw_params_set_avail_min((snd_pcm_t*)_pPCM, swParams, framesz));
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__check_error(snd_pcm_sw_params_set_start_threshold((snd_pcm_t*)_pPCM, swParams, framesz * samplesz));
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__check_error(snd_pcm_sw_params((snd_pcm_t*)_pPCM, swParams));
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}
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out:
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if (hwParams)
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snd_pcm_hw_params_free(hwParams);
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if (swParams)
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snd_pcm_sw_params_free(swParams);
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return rc;
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}
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int PCM::write(const void* data, uint32_t framesz)
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{
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int rc = snd_pcm_writei((snd_pcm_t*)_pPCM, data, framesz);
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if (rc < 0)
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{
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if (rc == -EPIPE)
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rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
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}
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return rc;
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}
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int PCM::write(void** datas, uint32_t framesz)
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{
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int rc = snd_pcm_writen((snd_pcm_t*)_pPCM, datas, framesz);
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if (rc < 0)
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{
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if (rc == -EPIPE)
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rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
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}
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return rc;
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}
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int PCM::read(void* buffer, uint32_t framesz)
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{
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int rc = snd_pcm_readi((snd_pcm_t*)_pPCM, buffer, (snd_pcm_uframes_t)framesz);
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if (rc < 0)
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{
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std::cout << "ALSA error: " << rc << " -> " << snd_strerror(rc) << "@" << framesz << std::endl;
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if (rc == -EPIPE)
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rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
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}
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return rc;
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}
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int PCM::read(void** buffers, uint32_t framesz)
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{
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int rc = snd_pcm_readn((snd_pcm_t*)_pPCM, buffers, (snd_pcm_uframes_t)framesz);
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if (rc < 0)
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{
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std::cout << "ALSA error: " << rc << " -> " << snd_strerror(rc) << "@" << framesz << std::endl;
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if (rc == -EPIPE)
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rc = snd_pcm_prepare((snd_pcm_t*)_pPCM);
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}
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return rc;
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}
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}
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}
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