563 lines
14 KiB
C++
Executable File
563 lines
14 KiB
C++
Executable File
/******************************************************************************\
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* Copyright (c) 2004-2005
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*
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* Author(s):
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* Volker Fischer, Alexander Kurpiers
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*
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* This code is based on the Open-Source sound interface implementation of
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* the Dream DRM Receiver project.
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*
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\******************************************************************************/
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#include "sound.h"
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#ifdef WITH_SOUND
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/* Wave in ********************************************************************/
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void CSound::InitRecording(int iNewBufferSize, bool bNewBlocking)
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{
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int err;
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/* set internal buffer size for read */
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iBufferSizeIn = iNewBufferSize / NUM_IN_OUT_CHANNELS; /* mono size */
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/* if recording device was already open, close it first */
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if ( rhandle != NULL )
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{
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snd_pcm_close ( rhandle );
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}
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/* record device: The most important ALSA interfaces to the PCM devices are
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the "plughw" and the "hw" interface. If you use the "plughw" interface,
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you need not care much about the sound hardware. If your soundcard does
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not support the sample rate or sample format you specify, your data will
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be automatically converted. This also applies to the access type and the
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number of channels. With the "hw" interface, you have to check whether
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your hardware supports the configuration you would like to use */
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/* either "hw:0,0" or "plughw:0,0" */
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if ( err = snd_pcm_open ( &rhandle, "hw:0,0", SND_PCM_STREAM_CAPTURE, 0 ) != 0 )
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{
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qDebug ( "open error: %s", snd_strerror ( err ) );
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}
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/* recording should be blocking */
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if ( err = snd_pcm_nonblock ( rhandle, FALSE ) != 0 )
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{
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qDebug ( "cannot set blocking: %s", snd_strerror ( err ) );
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}
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/* set hardware parameters */
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SetHWParams ( rhandle, iBufferSizeIn, iCurPeriodSizeIn );
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/* sw parameters --------------------------------------------------------- */
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snd_pcm_sw_params_t* swparams;
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// allocate an invalid snd_pcm_sw_params_t using standard malloc
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if ( err = snd_pcm_sw_params_malloc ( &swparams ) != 0 )
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{
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qDebug ( "snd_pcm_sw_params_malloc: %s", snd_strerror ( err ) );
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}
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// get the current swparams
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if ( err = snd_pcm_sw_params_current ( rhandle, swparams ) < 0 )
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{
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qDebug ( "Unable to determine current swparams : %s", snd_strerror ( err ) );
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}
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// start the transfer when the buffer immediately -> no threshold, val: 0
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err = snd_pcm_sw_params_set_start_threshold ( rhandle, swparams, 0 );
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if ( err < 0 )
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{
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qDebug ( "Unable to set start threshold mode : %s", snd_strerror ( err ) );
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}
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// align all transfers to 1 sample
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err = snd_pcm_sw_params_set_xfer_align ( rhandle, swparams, 1 );
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if ( err < 0 )
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{
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qDebug ( "Unable to set transfer align : %s", snd_strerror ( err ) );
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}
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// set avail min inside a software configuration container
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/* Note: This is similar to setting an OSS wakeup point. The valid values
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for 'val' are determined by the specific hardware. Most PC sound cards
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can only accept power of 2 frame counts (i.e. 512, 1024, 2048). You
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cannot use this as a high resolution timer - it is limited to how often
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the sound card hardware raises an interrupt. Note that you can greatly
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improve the reponses using snd_pcm_sw_params_set_sleep_min where another
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timing source is used */
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snd_pcm_uframes_t period_size = iBufferSizeIn;
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err = snd_pcm_sw_params_set_avail_min ( rhandle, swparams, period_size );
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if ( err < 0 )
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{
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qDebug ( "Unable to set avail min : %s", snd_strerror ( err ) );
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}
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// write the parameters to the record/playback device
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err = snd_pcm_sw_params ( rhandle, swparams );
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if ( err < 0 )
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{
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qDebug ( "Unable to set sw params : %s", snd_strerror ( err ) );
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}
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// clean-up
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snd_pcm_sw_params_free ( swparams );
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// start record
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snd_pcm_reset ( rhandle );
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snd_pcm_start ( rhandle );
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qDebug ( "alsa init record done" );
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}
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bool CSound::Read(CVector<short>& psData)
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{
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int ret;
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/* Check if device must be opened or reinitialized */
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if (bChangParamIn == true)
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{
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InitRecording ( iBufferSizeIn * NUM_IN_OUT_CHANNELS );
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/* Reset flag */
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bChangParamIn = false;
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}
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ret = snd_pcm_readi(rhandle, &psData[0], iBufferSizeIn);
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//snd_pcm_sframes_t test = snd_pcm_avail_update ( rhandle );
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//qDebug ( "test: %d", test );
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//if ( test == 64 )
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// snd_pcm_prepare ( rhandle );
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/*
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snd_pcm_status( rhandle, status );
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snd_pcm_sframes_t test = snd_pcm_status_get_delay(status);
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//qDebug ( "test: %d", test );
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*/
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//static FILE* pFile = fopen("test.dat", "w");
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//fprintf(pFile, "%d\n", test);
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//fflush(pFile);
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if ( ret < 0 )
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{
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if ( ret == -EPIPE )
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{
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// under-run
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qDebug ( "rprepare" );
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ret = snd_pcm_prepare ( rhandle );
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if ( ret < 0 )
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{
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qDebug ( "Can't recover from underrun, prepare failed: %s", snd_strerror ( ret ) );
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}
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ret = snd_pcm_start ( rhandle );
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if (ret < 0)
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{
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qDebug ( "Can't recover from underrun, start failed: %s", snd_strerror ( ret ) );
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}
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return true;
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}
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else if ( ret == -ESTRPIPE )
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{
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qDebug ( "strpipe" );
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// wait until the suspend flag is released
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while ( ( ret = snd_pcm_resume ( rhandle ) ) == -EAGAIN )
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{
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sleep ( 1 );
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}
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if ( ret < 0 )
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{
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ret = snd_pcm_prepare ( rhandle );
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if (ret < 0)
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{
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qDebug ( "Can't recover from suspend, prepare failed: %s", snd_strerror ( ret ) );
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}
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throw CGenErr ( "CSound:Read" );
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}
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return true;
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}
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else
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{
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qDebug ( "CSound::Read: %s", snd_strerror ( ret ) );
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throw CGenErr ( "CSound:Read" );
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}
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}
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else
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{
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return false;
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}
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}
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void CSound::SetInNumBuf ( int iNewNum )
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{
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/* check new parameter */
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if ( ( iNewNum >= MAX_SND_BUF_IN ) || ( iNewNum < 1 ) )
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{
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iNewNum = NUM_PERIOD_BLOCKS_IN;
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}
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/* Change only if parameter is different */
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if ( iNewNum != iCurPeriodSizeIn )
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{
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iCurPeriodSizeIn = iNewNum;
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bChangParamIn = true;
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}
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}
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/* Wave out *******************************************************************/
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void CSound::InitPlayback ( int iNewBufferSize, bool bNewBlocking )
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{
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int err;
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// save buffer size
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iBufferSizeOut = iNewBufferSize / NUM_IN_OUT_CHANNELS; // mono size
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// if playback device was already open, close it first
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if ( phandle != NULL )
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{
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snd_pcm_close ( phandle );
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}
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// playback device (either "hw:0,0" or "plughw:0,0")
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if ( err = snd_pcm_open ( &phandle, "hw:0,0",
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SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK ) != 0)
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{
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qDebug ( "open error: %s", snd_strerror ( err ) );
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}
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// non-blocking playback
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if ( err = snd_pcm_nonblock ( phandle, TRUE ) != 0 )
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{
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qDebug ( "cannot set blocking: %s", snd_strerror ( err ) );
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}
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// set hardware parameters
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SetHWParams ( phandle, iBufferSizeOut, iCurPeriodSizeOut );
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#if 0
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/* sw parameters --------------------------------------------------------- */
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snd_pcm_sw_params_t* swparams;
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// TEST
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// allocate an invalid snd_pcm_sw_params_t using standard malloc
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if ( err = snd_pcm_sw_params_malloc ( &swparams ) != 0 )
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{
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qDebug ( "snd_pcm_sw_params_malloc: %s", snd_strerror ( err ) );
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}
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/* get the current swparams */
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err = snd_pcm_sw_params_current(phandle, swparams);
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if (err < 0)
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{
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qDebug("Unable to determine current swparams for playback: %s\n", snd_strerror(err));
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}
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/* start the transfer when the buffer is almost full: */
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/* (buffer_size / avail_min) * avail_min */
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err = snd_pcm_sw_params_set_start_threshold(phandle, swparams, iCurPeriodSizeOut - 1);
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if (err < 0) {
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qDebug("Unable to set start threshold mode for playback: %s\n", snd_strerror(err));
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}
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/* allow the transfer when at least period_size samples can be processed */
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err = snd_pcm_sw_params_set_avail_min(phandle, swparams, iBufferSizeOut);
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if (err < 0) {
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qDebug("Unable to set avail min for playback: %s\n", snd_strerror(err));
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}
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/* align all transfers to 1 sample */
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err = snd_pcm_sw_params_set_xfer_align(phandle, swparams, 1);
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if (err < 0) {
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qDebug("Unable to set transfer align for playback: %s\n", snd_strerror(err));
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}
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/* write the parameters to the playback device */
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err = snd_pcm_sw_params(phandle, swparams);
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if (err < 0) {
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qDebug("Unable to set sw params for playback: %s\n", snd_strerror(err));
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}
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// clean-up
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snd_pcm_sw_params_free ( swparams );
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#endif
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// start playback
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snd_pcm_start ( phandle );
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qDebug ( "alsa init playback done" );
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}
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bool CSound::Write ( CVector<short>& psData )
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{
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int size = iBufferSizeIn;
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int start = 0;
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int ret;
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/* Check if device must be opened or reinitialized */
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if ( bChangParamOut == true )
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{
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InitPlayback ( iBufferSizeOut * NUM_IN_OUT_CHANNELS );
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/* Reset flag */
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bChangParamOut = false;
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}
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while ( size )
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{
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ret = snd_pcm_writei ( phandle, &psData[start], size );
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//snd_pcm_sframes_t test = snd_pcm_avail_update ( phandle );
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//qDebug ( "test: %d", test );
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//if ( test == 64 )
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// snd_pcm_prepare ( rhandle );
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/*
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snd_pcm_sframes_t delayp;
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snd_pcm_delay ( phandle, &delayp ) ;
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qDebug ( "test: %d", delayp );
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*/
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//snd_pcm_status_t* status;
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//snd_pcm_status_alloca(&status);
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//snd_pcm_status( phandle, status );
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//snd_pcm_sframes_t test = snd_pcm_status_get_delay(status);
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//qDebug ( "test: %d", test );
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//snd_pcm_status( phandle, status );
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//snd_pcm_sframes_t test = snd_pcm_status_get_delay(status);
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//qDebug ( "test: %d", test );
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//static FILE* pFile = fopen("test.dat", "w");
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//fprintf(pFile, "%d\n", test);
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//fflush(pFile);
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if ( ret < 0 )
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{
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if ( ret == -EPIPE )
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{
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/* under-run */
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qDebug ( "wunderrun" );
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ret = snd_pcm_prepare ( phandle );
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if ( ret < 0 )
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{
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qDebug ( "Can't recover from underrun, prepare failed: %s", snd_strerror ( ret ) );
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}
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continue;
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}
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else if ( ret == -EAGAIN )
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{
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if ( ( ret = snd_pcm_wait ( phandle, 1 ) ) < 0 )
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{
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qDebug ( "poll failed (%s)", snd_strerror ( ret ) );
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break;
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}
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continue;
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}
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else if ( ret == -ESTRPIPE )
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{
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qDebug("wstrpipe");
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/* wait until the suspend flag is released */
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while ( (ret = snd_pcm_resume ( phandle ) ) == -EAGAIN )
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{
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sleep(1);
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}
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if ( ret < 0 )
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{
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ret = snd_pcm_prepare ( phandle );
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if ( ret < 0 )
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{
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qDebug ( "Can't recover from suspend, prepare failed: %s", snd_strerror ( ret ) );
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}
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}
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continue;
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}
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else
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{
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qDebug ( "Write error: %s", snd_strerror ( ret ) );
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}
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break; // skip one period
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}
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size -= ret;
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start += ret;
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}
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return false;
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}
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void CSound::SetOutNumBuf(int iNewNum)
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{
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/* check new parameter */
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if ( ( iNewNum >= MAX_SND_BUF_OUT ) || ( iNewNum < 1 ) )
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{
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iNewNum = NUM_PERIOD_BLOCKS_OUT;
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}
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/* Change only if parameter is different */
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if ( iNewNum != iCurPeriodSizeOut )
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{
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iCurPeriodSizeOut = iNewNum;
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bChangParamOut = true;
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}
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}
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/* common **********************************************************************/
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bool CSound::SetHWParams(snd_pcm_t* handle, const int iBufferSizeIn,
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const int iNumPeriodBlocks)
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{
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int err;
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snd_pcm_hw_params_t* hwparams;
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// allocate an invalid snd_pcm_hw_params_t using standard malloc
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if ( err = snd_pcm_hw_params_malloc ( &hwparams ) < 0 )
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{
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qDebug ( "cannot allocate hardware parameter structure (%s)\n", snd_strerror ( err ) );
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return true;
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}
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// fill params with a full configuration space for a PCM
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if ( err = snd_pcm_hw_params_any ( handle, hwparams ) < 0 )
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{
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qDebug ( "cannot initialize hardware parameter structure (%s)\n", snd_strerror ( err ) );
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return true;
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}
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// restrict a configuration space to contain only one access type:
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// set the interleaved read/write format
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if ( err = snd_pcm_hw_params_set_access ( handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED ) < 0 )
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{
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qDebug ( "Access type not available : %s", snd_strerror ( err ) );
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return true;
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}
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// restrict a configuration space to contain only one format:
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// set the sample format PCM, 16 bit
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if ( err = snd_pcm_hw_params_set_format ( handle, hwparams, SND_PCM_FORMAT_S16 ) < 0 )
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{
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qDebug ( "Sample format not available : %s", snd_strerror ( err ) );
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return true;
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}
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// restrict a configuration space to contain only one channels count:
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// set the count of channels (usually stereo, 2 channels)
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if ( err = snd_pcm_hw_params_set_channels(handle, hwparams, NUM_IN_OUT_CHANNELS ) < 0 )
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{
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qDebug ( "Channels count (%i) not available s: %s", NUM_IN_OUT_CHANNELS, snd_strerror ( err ) );
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return true;
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}
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// restrict a configuration space to have rate nearest to a target:
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// set the sample-rate
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unsigned int rrate = SND_CRD_SAMPLE_RATE;
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if ( err = snd_pcm_hw_params_set_rate_near ( handle, hwparams, &rrate, 0 ) < 0 )
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{
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qDebug ( "Rate %iHz not available : %s", rrate, snd_strerror ( err ) );
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return true;
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}
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if ( rrate != SND_CRD_SAMPLE_RATE ) // check if rate is possible
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{
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qDebug ( "Rate doesn't match (requested %iHz, get %iHz)", rrate, err );
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return true;
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}
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// set the buffer size and period size
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snd_pcm_uframes_t BufferFrames = iBufferSizeIn * iNumPeriodBlocks;
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if ( err = snd_pcm_hw_params_set_buffer_size_near ( handle, hwparams, &BufferFrames ) < 0 )
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{
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qDebug ( "cannot set buffer size (%s)\n", snd_strerror ( err ) );
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return true;
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}
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// set the period size
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snd_pcm_uframes_t PeriodSize = iBufferSizeIn;
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if ( err = snd_pcm_hw_params_set_period_size_near ( handle, hwparams, &PeriodSize, 0 ) < 0 )
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{
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qDebug ( "cannot set period size (%s)\n", snd_strerror ( err ) );
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return true;
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}
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// write the parameters to device
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if ( err = snd_pcm_hw_params ( handle, hwparams ) < 0 )
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{
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qDebug("Unable to set hw params : %s", snd_strerror(err));
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return true;
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}
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/* check period and buffer size */
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snd_pcm_uframes_t buffer_size;
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if (err = snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size) < 0) {
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qDebug("Unable to get buffer size for playback: %s\n", snd_strerror(err));
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}
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qDebug("buffer size: %d (desired: %d)", buffer_size, iBufferSizeIn * iNumPeriodBlocks);
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snd_pcm_uframes_t period_size;
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err = snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0);
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if (err < 0)
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{
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qDebug("Unable to get period size for playback: %s\n", snd_strerror(err));
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}
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qDebug("frame size: %d (desired: %d)", period_size, iBufferSizeIn);
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/* clean-up */
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|
snd_pcm_hw_params_free ( hwparams );
|
|
|
|
return false;
|
|
}
|
|
|
|
void CSound::Close ()
|
|
{
|
|
/* read */
|
|
if ( rhandle != NULL )
|
|
{
|
|
snd_pcm_close ( rhandle );
|
|
}
|
|
|
|
rhandle = NULL;
|
|
|
|
/* playback */
|
|
if ( phandle != NULL )
|
|
{
|
|
snd_pcm_close ( phandle );
|
|
}
|
|
|
|
phandle = NULL;
|
|
}
|
|
|
|
#endif /* WITH_SOUND */
|