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dynamically allocate a buffer for 0.5s of audio for OS X

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git-svn-id: https://svn.musicpd.org/mpd/trunk@3097 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Warren Dukes 2005-03-17 03:08:34 +00:00
parent a85438792f
commit 700d7aa2a0
1 changed files with 20 additions and 13 deletions
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33
src/audioOutputs/audioOutput_osx.c
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@ -26,13 +26,12 @@
#include "../log.h"
#define BUFFER_SIZE 131072
typedef struct _OsxData {
AudioUnit au;
pthread_mutex_t mutex;
pthread_cond_t condition;
char buffer[BUFFER_SIZE];
char * buffer;
int bufferSize;
int pos;
int len;
int go;
@ -49,6 +48,8 @@ static OsxData * newOsxData() {
ret->len = 0;
ret->go = 0;
ret->started = 0;
ret->buffer = NULL;
ret->bufferSize = 0;
return ret;
}
@ -89,6 +90,7 @@ static int osx_initDriver(AudioOutput * audioOutput, ConfigParam * param) {
}
static void freeOsxData(OsxData * od) {
if(od->buffer) free(od->buffer);
free(od);
}
@ -143,7 +145,7 @@ static OSStatus osx_render(void * vdata,
while((od->go || od->len) && bufferSize) {
while(od->go && od->len < bufferSize &&
od->len < BUFFER_SIZE)
od->len < od->bufferSize)
{
pthread_cond_signal(&od->condition);
pthread_cond_wait(&od->condition, &od->mutex);
@ -153,8 +155,8 @@ static OSStatus osx_render(void * vdata,
bufferSize -= bytesToCopy;
od->len -= bytesToCopy;
if(od->pos+bytesToCopy > BUFFER_SIZE) {
int bytes = BUFFER_SIZE-od->pos;
if(od->pos+bytesToCopy > od->bufferSize) {
int bytes = od->bufferSize-od->pos;
memcpy(buffer->mData+curpos, od->buffer+od->pos, bytes);
od->pos = 0;
curpos += bytes;
@ -165,7 +167,7 @@ static OSStatus osx_render(void * vdata,
od->pos += bytesToCopy;
curpos += bytesToCopy;
if(od->pos >= BUFFER_SIZE) od->pos = 0;
if(od->pos >= od->bufferSize) od->pos = 0;
}
buffer->mDataByteSize -= bufferSize;
@ -240,6 +242,11 @@ static int osx_openDevice(AudioOutput * audioOutput) {
return -1;
}
/* create a buffer of 0.5s */
od->bufferSize = (audioFormat->sampleRate >> 1) *
(audioFormat->bits>>3) * (audioFormat->channels);
od->buffer = realloc(od->buffer, od->bufferSize);
od->pos = 0;
od->len = 0;
@ -266,21 +273,21 @@ static int osx_play(AudioOutput * audioOutput, char * playChunk, int size) {
pthread_mutex_lock(&od->mutex);
curpos = od->pos+od->len;
if(curpos >= BUFFER_SIZE) curpos -= BUFFER_SIZE;
if(curpos >= od->bufferSize) curpos -= od->bufferSize;
while(size) {
while(od->len >= BUFFER_SIZE) {
while(od->len >= od->bufferSize) {
pthread_cond_signal(&od->condition);
pthread_cond_wait(&od->condition, &od->mutex);
}
bytesToCopy = BUFFER_SIZE - od->len;
bytesToCopy = od->bufferSize - od->len;
bytesToCopy = bytesToCopy < size ? bytesToCopy : size;
size -= bytesToCopy;
od->len += bytesToCopy;
if(curpos+bytesToCopy > BUFFER_SIZE) {
int bytes = BUFFER_SIZE-curpos;
if(curpos+bytesToCopy > od->bufferSize) {
int bytes = od->bufferSize-curpos;
memcpy(od->buffer+curpos, playChunk, bytes);
curpos = 0;
playChunk += bytes;
@ -291,7 +298,7 @@ static int osx_play(AudioOutput * audioOutput, char * playChunk, int size) {
curpos += bytesToCopy;
playChunk += bytesToCopy;
if(curpos >= BUFFER_SIZE) curpos = 0;
if(curpos >= od->bufferSize) curpos = 0;
}
pthread_cond_signal(&od->condition);