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https://github.com/cookiengineer/audacity
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Move library tree where it belongs
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ra
395
lib-src/portaudio/pa_unix_oss/pa_unix_oss.c
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395
lib-src/portaudio/pa_unix_oss/pa_unix_oss.c
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/*
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* PortAudio Portable Real-Time Audio Library
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* Latest Version at: http://www.portaudio.com
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* Linux OSS Implementation by douglas repetto and Phil Burk
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*
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* Copyright (c) 1999-2000 Phil Burk
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files
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* (the "Software"), to deal in the Software without restriction,
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* including without limitation the rights to use, copy, modify, merge,
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* publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so,
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* subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* Any person wishing to distribute modifications to the Software is
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* requested to send the modifications to the original developer so that
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* they can be incorporated into the canonical version.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
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* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
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* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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*/
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/* Modification history:
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20020621: pa_unix_oss.c split into pa_unix.c, pa_unix.h, pa_unix_oss.c by
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Augustus Saunders. See pa_unix.c for previous history. Pa_FlushStream
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added by Augustus Saunders for Solaris compatibility.
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PLB20021018 - Fill device info table with actual sample rates instead of wished for rates.
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- Allow stream to open if sample rate within 10% of desired rate.
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*/
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#include "pa_unix.h"
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#if defined(__linux__)
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#include <linux/soundcard.h>
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#elif defined(__FreeBSD__)
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#include <sys/soundcard.h>
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#else
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#include <machine/soundcard.h> /* JH20010905 */
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#endif
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#ifndef AFMT_S16_NE
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#define AFMT_S16_NE Get_AFMT_S16_NE()
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/*********************************************************************
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* Some versions of OSS do not define AFMT_S16_NE. So check CPU.
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* PowerPC is Big Endian. X86 is Little Endian.
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*/
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int Get_AFMT_S16_NE( void )
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{
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long testData = 1;
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char *ptr = (char *) &testData;
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int isLittle = ( *ptr == 1 ); /* Does address point to least significant byte? */
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return isLittle ? AFMT_S16_LE : AFMT_S16_BE;
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}
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#endif /* AFMT_S16_NE */
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/*********************************************************************
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* Try to open the named device.
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* If it opens, try to set various rates and formats and fill in
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* the device info structure.
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*/
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PaError Pa_QueryDevice( const char *deviceName, internalPortAudioDevice *pad )
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{
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int result = paHostError;
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int tempDevHandle;
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int numChannels, maxNumChannels;
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int format;
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int numSampleRates;
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int sampleRate;
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int numRatesToTry;
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int lastRate;
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int ratesToTry[9] = {96000, 48000, 44100, 32000, 24000, 22050, 16000, 11025, 8000};
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int i;
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/* douglas:
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we have to do this querying in a slightly different order. apparently
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some sound cards will give you different info based on their settings.
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e.g. a card might give you stereo at 22kHz but only mono at 44kHz.
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the correct order for OSS is: format, channels, sample rate
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*/
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if ( (tempDevHandle = open(deviceName,O_WRONLY|O_NONBLOCK)) == -1 )
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{
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DBUG(("Pa_QueryDevice: could not open %s\n", deviceName ));
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return paHostError;
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}
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/* Ask OSS what formats are supported by the hardware. */
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pad->pad_Info.nativeSampleFormats = 0;
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if (ioctl(tempDevHandle, SNDCTL_DSP_GETFMTS, &format) == -1)
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{
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ERR_RPT(("Pa_QueryDevice: could not get format info\n" ));
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goto error;
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}
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if( format & AFMT_U8 ) pad->pad_Info.nativeSampleFormats |= paUInt8;
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if( format & AFMT_S16_NE ) pad->pad_Info.nativeSampleFormats |= paInt16;
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/* Negotiate for the maximum number of channels for this device. PLB20010927
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* Consider up to 16 as the upper number of channels.
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* Variable numChannels should contain the actual upper limit after the call.
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* Thanks to John Lazzaro and Heiko Purnhagen for suggestions.
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*/
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maxNumChannels = 0;
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for( numChannels = 1; numChannels <= 16; numChannels++ )
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{
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int temp = numChannels;
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DBUG(("Pa_QueryDevice: use SNDCTL_DSP_CHANNELS, numChannels = %d\n", numChannels ))
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if(ioctl(tempDevHandle, SNDCTL_DSP_CHANNELS, &temp) < 0 )
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{
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/* ioctl() failed so bail out if we already have stereo */
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if( numChannels > 2 ) break;
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}
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else
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{
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/* ioctl() worked but bail out if it does not support numChannels.
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* We don't want to leave gaps in the numChannels supported.
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*/
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if( (numChannels > 2) && (temp != numChannels) ) break;
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DBUG(("Pa_QueryDevice: temp = %d\n", temp ))
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if( temp > maxNumChannels ) maxNumChannels = temp; /* Save maximum. */
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}
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}
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/* The above negotiation may fail for an old driver so try this older technique. */
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if( maxNumChannels < 1 )
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{
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int stereo = 1;
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if(ioctl(tempDevHandle, SNDCTL_DSP_STEREO, &stereo) < 0)
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{
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maxNumChannels = 1;
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}
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else
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{
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maxNumChannels = (stereo) ? 2 : 1;
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}
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DBUG(("Pa_QueryDevice: use SNDCTL_DSP_STEREO, maxNumChannels = %d\n", maxNumChannels ))
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}
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pad->pad_Info.maxOutputChannels = maxNumChannels;
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DBUG(("Pa_QueryDevice: maxNumChannels = %d\n", maxNumChannels))
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/* During channel negotiation, the last ioctl() may have failed. This can
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* also cause sample rate negotiation to fail. Hence the following, to return
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* to a supported number of channels. SG20011005 */
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{
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int temp = maxNumChannels;
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if( temp > 2 ) temp = 2; /* use most reasonable default value */
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ioctl(tempDevHandle, SNDCTL_DSP_CHANNELS, &temp);
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}
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/* FIXME - for now, assume maxInputChannels = maxOutputChannels.
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* Eventually do separate queries for O_WRONLY and O_RDONLY
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*/
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pad->pad_Info.maxInputChannels = pad->pad_Info.maxOutputChannels;
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DBUG(("Pa_QueryDevice: maxInputChannels = %d\n",
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pad->pad_Info.maxInputChannels))
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/* Determine available sample rates by trying each one and seeing result.
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* OSS often supports funky rates such as 44188 instead of 44100!
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*/
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numSampleRates = 0;
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lastRate = 0;
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numRatesToTry = sizeof(ratesToTry)/sizeof(int);
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for (i = 0; i < numRatesToTry; i++)
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{
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sampleRate = ratesToTry[i];
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if (ioctl(tempDevHandle, SNDCTL_DSP_SPEED, &sampleRate) >= 0 ) /* PLB20010817 */
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{
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/* Use whatever rate OSS tells us. PLB20021018 */
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if (sampleRate != lastRate)
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{
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DBUG(("Pa_QueryDevice: adding sample rate: %d\n", sampleRate))
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pad->pad_SampleRates[numSampleRates] = (float)sampleRate;
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numSampleRates++;
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lastRate = sampleRate;
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}
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else
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{
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DBUG(("Pa_QueryDevice: dang - got sample rate %d again!\n", sampleRate))
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}
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}
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}
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DBUG(("Pa_QueryDevice: final numSampleRates = %d\n", numSampleRates))
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if (numSampleRates==0) /* HP20010922 */
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{
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/* Desparate attempt to keep running even though no good rates found! */
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ERR_RPT(("Pa_QueryDevice: no supported sample rate (or SNDCTL_DSP_SPEED ioctl call failed). Force 44100 Hz\n" ));
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pad->pad_SampleRates[numSampleRates++] = 44100;
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}
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pad->pad_Info.numSampleRates = numSampleRates;
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pad->pad_Info.sampleRates = pad->pad_SampleRates; /* use pointer to embedded array */
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pad->pad_Info.name = deviceName;
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result = paNoError;
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error:
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/* We MUST close the handle here or we won't be able to reopen it later!!! */
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close(tempDevHandle);
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return result;
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}
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/*******************************************************************************************/
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PaError Pa_SetupDeviceFormat( int devHandle, int numChannels, int sampleRate )
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{
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PaError result = paNoError;
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int tmp;
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/* Set format, channels, and rate in this order to keep OSS happy. */
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/* Set data format. FIXME - handle more native formats. */
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tmp = AFMT_S16_NE;
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if( ioctl(devHandle,SNDCTL_DSP_SETFMT,&tmp) == -1)
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{
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ERR_RPT(("Pa_SetupDeviceFormat: could not SNDCTL_DSP_SETFMT\n" ));
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return paHostError;
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}
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if( tmp != AFMT_S16_NE )
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{
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ERR_RPT(("Pa_SetupDeviceFormat: HW does not support AFMT_S16_NE\n" ));
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return paHostError;
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}
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/* Set number of channels. */
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tmp = numChannels;
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if (ioctl(devHandle, SNDCTL_DSP_CHANNELS, &numChannels) == -1)
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{
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ERR_RPT(("Pa_SetupDeviceFormat: could not SNDCTL_DSP_CHANNELS\n" ));
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return paHostError;
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}
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if( tmp != numChannels)
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{
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ERR_RPT(("Pa_SetupDeviceFormat: HW does not support %d channels\n", numChannels ));
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return paHostError;
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}
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/* Set playing frequency. */
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tmp = sampleRate;
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if( ioctl(devHandle,SNDCTL_DSP_SPEED,&tmp) == -1)
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{
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ERR_RPT(("Pa_SetupDeviceFormat: could not SNDCTL_DSP_SPEED\n" ));
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return paHostError;
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}
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else if( tmp != sampleRate )
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{
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int percentError = abs( (100 * (sampleRate - tmp)) / sampleRate );
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PRINT(("Pa_SetupDeviceFormat: warning - requested sample rate = %d Hz - closest = %d\n",
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sampleRate, tmp ));
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/* Allow sample rate within 10% off of requested rate. PLB20021018
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* Sometimes OSS uses a funky rate like 44188 instead of 44100.
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*/
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if( percentError > 10 )
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{
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ERR_RPT(("Pa_SetupDeviceFormat: HW does not support %d Hz sample rate\n",sampleRate ));
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return paHostError;
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}
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}
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return result;
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}
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PaError Pa_SetupOutputDeviceFormat( int devHandle, int numChannels, int sampleRate )
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{
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return Pa_SetupDeviceFormat(devHandle, numChannels, sampleRate);
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}
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PaError Pa_SetupInputDeviceFormat( int devHandle, int numChannels, int sampleRate )
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{
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return Pa_SetupDeviceFormat(devHandle, numChannels, sampleRate);
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}
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/*******************************************************************************************
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** Set number of fragments and size of fragments to achieve desired latency.
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*/
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static int CalcHigherLogTwo( int n )
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{
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int log2 = 0;
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while( (1<<log2) < n ) log2++;
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return log2;
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}
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void Pa_SetLatency( int devHandle, int numBuffers, int framesPerBuffer, int channelsPerFrame )
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{
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int tmp;
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int bufferSize, powerOfTwo;
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/* Increase size of buffers and reduce number of buffers to reduce latency inside driver. */
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while( numBuffers > 8 )
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{
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numBuffers = (numBuffers + 1) >> 1;
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framesPerBuffer = framesPerBuffer << 1;
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}
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/* calculate size of buffers in bytes */
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bufferSize = framesPerBuffer * channelsPerFrame * sizeof(short); /* FIXME - other sizes? */
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/* Calculate next largest power of two */
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powerOfTwo = CalcHigherLogTwo( bufferSize );
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DBUG(("Pa_SetLatency: numBuffers = %d, framesPerBuffer = %d, powerOfTwo = %d\n",
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numBuffers, framesPerBuffer, powerOfTwo ));
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/* Encode info into a single int */
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tmp=(numBuffers<<16) + powerOfTwo;
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if(ioctl(devHandle,SNDCTL_DSP_SETFRAGMENT,&tmp) == -1)
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{
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ERR_RPT(("Pa_SetLatency: could not SNDCTL_DSP_SETFRAGMENT\n" ));
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/* Don't return an error. Best to just continue and hope for the best. */
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ERR_RPT(("Pa_SetLatency: numBuffers = %d, framesPerBuffer = %d, powerOfTwo = %d\n",
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numBuffers, framesPerBuffer, powerOfTwo ));
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}
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}
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/***********************************************************************/
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PaTimestamp Pa_StreamTime( PortAudioStream *stream )
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{
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internalPortAudioStream *past = (internalPortAudioStream *) stream;
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PaHostSoundControl *pahsc;
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count_info info;
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unsigned int delta;
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unsigned int numchan;
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if( past == NULL ) return paBadStreamPtr;
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pahsc = (PaHostSoundControl *) past->past_DeviceData;
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if( pahsc->pahsc_NativeOutputBuffer )
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{
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ioctl(pahsc->pahsc_OutputHandle, SNDCTL_DSP_GETOPTR, &info);
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numchan = past->past_NumOutputChannels;
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}
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else
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{
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ioctl(pahsc->pahsc_InputHandle, SNDCTL_DSP_GETIPTR, &info);
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numchan = past->past_NumInputChannels;
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}
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delta = info.bytes - pahsc->pahsc_LastPosPtr;
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if (delta > 0x000FFFFF)
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delta = 0;
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return (pahsc->pahsc_LastStreamBytes + delta) / (numchan * sizeof(short));
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}
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void Pa_UpdateStreamTime(PaHostSoundControl *pahsc)
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{
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count_info info;
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unsigned int delta;
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/* Update current stream time (using a double so that
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we don't wrap around like info.bytes does) */
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if( pahsc->pahsc_NativeOutputBuffer )
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{
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ioctl(pahsc->pahsc_OutputHandle, SNDCTL_DSP_GETOPTR, &info);
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}
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else
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{
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ioctl(pahsc->pahsc_InputHandle, SNDCTL_DSP_GETIPTR, &info);
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}
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delta = info.bytes - pahsc->pahsc_LastPosPtr;
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if (delta <= 0x000FFFFF) {
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pahsc->pahsc_LastStreamBytes += delta;
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pahsc->pahsc_LastPosPtr = info.bytes;
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}
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}
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PaError Pa_FlushStream(int devHandle)
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{
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/* AS: This doesn't do anything under OSS; it was added for Solaris.*/
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return paNoError;
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}
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