mpd/src/audioOutputs/audioOutput_osx.c

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/* the Music Player Daemon (MPD)
* (c)2003-2004 by Warren Dukes (shank@mercury.chem.pitt.edu)
* This project's homepage is: http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "../audioOutput.h"
#ifdef HAVE_OSX
#include <AudioUnit/AudioUnit.h>
#include <stdlib.h>
#include <pthread.h>
#include "../log.h"
#define BUFFER_SIZE 8192
typedef struct _OsxData {
AudioUnit au;
pthread_mutex_t mutex;
pthread_cond_t condition;
char buffer[BUFFER_SIZE];
int pos;
int len;
int go;
int started;
} OsxData;
static OsxData * newOsxData() {
OsxData * ret = malloc(sizeof(OsxData));
pthread_mutex_init(&ret->mutex, NULL);
pthread_cond_init(&ret->condition, NULL);
ret->pos = 0;
ret->len = 0;
ret->go = 0;
ret->started = 0;
return ret;
}
static int osx_testDefault() {
/*AudioUnit au;
ComponentDescription desc;
Component comp;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_Output;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
comp = FindNextComponent(NULL, &desc);
if(!comp) {
ERROR("Unable to open default OS X defice\n");
return -1;
}
if(OpenAComponent(comp, &au) != noErr) {
ERROR("Unable to open default OS X defice\n");
return -1;
}
CloseComponent(au);*/
return 0;
}
static int osx_initDriver(AudioOutput * audioOutput, ConfigParam * param) {
OsxData * od = newOsxData();
audioOutput->data = od;
return 0;
}
static void freeOsxData(OsxData * od) {
free(od);
}
static void osx_finishDriver(AudioOutput * audioOutput) {
OsxData * od = (OsxData *)audioOutput->data;
freeOsxData(od);
}
static void osx_dropBufferedAudio(AudioOutput * audioOutput) {
/* not implemented yet */
}
static void osx_closeDevice(AudioOutput * audioOutput) {
OsxData * od = (OsxData *) audioOutput->data;
DEBUG("entering osx_closeDevice\n");
pthread_mutex_lock(&od->mutex);
od->go = 0;
while(od->len) {
DEBUG("osx_closeDevice: cond_wait\n");
pthread_cond_wait(&od->condition, &od->mutex);
}
pthread_mutex_unlock(&od->mutex);
DEBUG("stopping au\n");
AudioOutputUnitStop(od->au);
DEBUG("closing au\n");
CloseComponent(od->au);
AudioUnitUninitialize(od->au);
DEBUG("Leaving osx_closeDevice\n");
audioOutput->open = 0;
}
static OSStatus osx_render(void * vdata,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber, UInt32 inNumberFrames,
AudioBufferList *bufferList)
{
OsxData * od = (OsxData *)vdata;
AudioBuffer * buffer = &bufferList->mBuffers[0];
int bufferSize = buffer->mDataByteSize;
int bytesToCopy;
int curpos = 0;
pthread_mutex_lock(&od->mutex);
while((od->go || od->len) && bufferSize) {
while(od->go && od->len < bufferSize &&
od->len < BUFFER_SIZE)
{
pthread_cond_signal(&od->condition);
pthread_cond_wait(&od->condition, &od->mutex);
}
bytesToCopy = od->len < bufferSize ? od->len : bufferSize;
bufferSize -= bytesToCopy;
od->len -= bytesToCopy;
if(od->pos+bytesToCopy > BUFFER_SIZE) {
int bytes = BUFFER_SIZE-od->pos;
memcpy(buffer->mData+curpos, od->buffer+od->pos, bytes);
od->pos = 0;
curpos += bytes;
bytesToCopy -= bytes;
}
assert(bytesToCopy);
memcpy(buffer->mData+curpos, od->buffer+od->pos, bytesToCopy);
od->pos += bytesToCopy;
curpos += bytesToCopy;
if(od->pos >= BUFFER_SIZE) od->pos = 0;
}
if(bufferSize) {
memset(buffer->mData+curpos, 0, bufferSize);
}
pthread_cond_signal(&od->condition);
pthread_mutex_unlock(&od->mutex);
return 0;
}
static int osx_openDevice(AudioOutput * audioOutput) {
OsxData * od = (OsxData *)audioOutput->data;
ComponentDescription desc;
Component comp;
AURenderCallbackStruct callback;
AudioFormat * audioFormat = &audioOutput->outAudioFormat;
AudioStreamBasicDescription streamDesc;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = kAudioUnitSubType_DefaultOutput;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
DEBUG("finding component\n");
comp = FindNextComponent(NULL, &desc);
if(comp == 0) {
ERROR("Error finding OS X component\n");
return -1;
}
DEBUG("opening component\n");
if(OpenAComponent(comp, &od->au) != noErr) {
ERROR("Unable to open OS X component\n");
return -1;
}
DEBUG("initializing au\n");
if(AudioUnitInitialize(od->au) != 0) {
CloseComponent(od->au);
ERROR("Unable to initialuze OS X audio unit\n");
return -1;
}
callback.inputProc = osx_render;
callback.inputProcRefCon = od;
DEBUG("set callback\n");
if(AudioUnitSetProperty(od->au, kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input, 0,
&callback, sizeof(callback)) != 0)
{
AudioUnitUninitialize(od->au);
CloseComponent(od->au);
ERROR("unable to set callbak for OS X audio unit\n");
return -1;
}
streamDesc.mSampleRate = audioFormat->sampleRate;
streamDesc.mFormatID = kAudioFormatLinearPCM;
streamDesc.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger |
kLinearPCMFormatFlagIsBigEndian;
streamDesc.mBytesPerPacket = audioFormat->channels*audioFormat->bits/8;
streamDesc.mFramesPerPacket = 1;
streamDesc.mBytesPerFrame = streamDesc.mBytesPerPacket;
streamDesc.mChannelsPerFrame = audioFormat->channels;
streamDesc.mBitsPerChannel = audioFormat->bits;
DEBUG("set format\n");
if(AudioUnitSetProperty(od->au, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0,
&streamDesc, sizeof(streamDesc)) != 0)
{
AudioUnitUninitialize(od->au);
CloseComponent(od->au);
ERROR("Unable to set format on OS X device\n");
return -1;
}
DEBUG("start\n");
int err = AudioOutputUnitStart(od->au);
if(err) {
ERROR("unable to start audio output: %i\n", err);
return -1;
}
od->go = 1;
od->pos = 0;
od->len = 0;
audioOutput->open = 1;
DEBUG("opened OS X device\n");
return 0;
}
static int osx_play(AudioOutput * audioOutput, char * playChunk, int size) {
OsxData * od = (OsxData *)audioOutput->data;
int bytesToCopy;
int curpos;
pthread_mutex_lock(&od->mutex);
curpos = od->pos+od->len;
if(curpos >= BUFFER_SIZE) curpos -= BUFFER_SIZE;
while(size) {
while(od->len >= BUFFER_SIZE) {
if(curpos!=od->pos) {
DEBUG("%i != %i\n", curpos, od->pos);
abort();
}
pthread_cond_signal(&od->condition);
pthread_cond_wait(&od->condition, &od->mutex);
}
bytesToCopy = BUFFER_SIZE - od->len;
bytesToCopy = bytesToCopy < size ? bytesToCopy : size;
size -= bytesToCopy;
od->len += bytesToCopy;
if(curpos+bytesToCopy > BUFFER_SIZE) {
int bytes = BUFFER_SIZE-curpos;
memcpy(od->buffer+curpos, playChunk, bytes);
curpos = 0;
playChunk += bytes;
bytesToCopy -= bytes;
}
assert(bytesToCopy);
memcpy(od->buffer+curpos, playChunk, bytesToCopy);
curpos += bytesToCopy;
playChunk += bytesToCopy;
if(curpos >= BUFFER_SIZE) curpos = 0;
}
pthread_cond_signal(&od->condition);
pthread_mutex_unlock(&od->mutex);
return 0;
}
AudioOutputPlugin osxPlugin =
{
"osx",
osx_testDefault,
osx_initDriver,
osx_finishDriver,
osx_openDevice,
osx_play,
osx_dropBufferedAudio,
osx_closeDevice,
NULL /* sendMetadataFunc */
};
#else
#include <stdio.h>
AudioOutputPlugin osxPlugin =
{
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL,
NULL
};
#endif