ref: c2fda8f3e4f3623d1766d37078fb05d3ef6dbbe8
dir: /src/coreaudio.c/
/* AudioCore sound handler
*
* Copyright 2008 Chris Bagwell And Sundry Contributors
*/
#include "sox_i.h"
#include <CoreAudio/CoreAudio.h>
#include <pthread.h>
#define Buffactor 4
typedef struct {
AudioDeviceID adid;
pthread_mutex_t mutex;
pthread_cond_t cond;
int device_started;
size_t bufsize;
size_t bufrd;
size_t bufwr;
size_t bufrdavail;
float *buf;
} priv_t;
static OSStatus PlaybackIOProc(AudioDeviceID inDevice UNUSED,
const AudioTimeStamp *inNow UNUSED,
const AudioBufferList *inInputData UNUSED,
const AudioTimeStamp *inInputTime UNUSED,
AudioBufferList *outOutputData,
const AudioTimeStamp *inOutputTime UNUSED,
void *inClientData)
{
priv_t *ac = (priv_t*)((sox_format_t*)inClientData)->priv;
AudioBuffer *buf;
size_t copylen, avail;
pthread_mutex_lock(&ac->mutex);
for(buf = outOutputData->mBuffers;
buf != outOutputData->mBuffers + outOutputData->mNumberBuffers;
buf++){
copylen = buf->mDataByteSize / sizeof(float);
if(copylen > ac->bufrdavail)
copylen = ac->bufrdavail;
avail = ac->bufsize - ac->bufrd;
if(buf->mData == NULL){
/*do nothing-hardware can't play audio*/
}else if(copylen > avail){
memcpy(buf->mData, ac->buf + ac->bufrd, avail * sizeof(float));
memcpy((float*)buf->mData + avail, ac->buf, (copylen - avail) * sizeof(float));
}else{
memcpy(buf->mData, ac->buf + ac->bufrd, copylen * sizeof(float));
}
buf->mDataByteSize = copylen * sizeof(float);
ac->bufrd += copylen;
if(ac->bufrd >= ac->bufsize)
ac->bufrd -= ac->bufsize;
ac->bufrdavail -= copylen;
}
pthread_cond_signal(&ac->cond);
pthread_mutex_unlock(&ac->mutex);
return kAudioHardwareNoError;
}
static OSStatus RecIOProc(AudioDeviceID inDevice UNUSED,
const AudioTimeStamp *inNow UNUSED,
const AudioBufferList *inInputData,
const AudioTimeStamp *inInputTime UNUSED,
AudioBufferList *outOutputData UNUSED,
const AudioTimeStamp *inOutputTime UNUSED,
void *inClientData)
{
priv_t *ac = (priv_t *)((sox_format_t*)inClientData)->priv;
AudioBuffer const *buf;
size_t nfree, copylen, avail;
pthread_mutex_lock(&ac->mutex);
for(buf = inInputData->mBuffers;
buf != inInputData->mBuffers + inInputData->mNumberBuffers;
buf++){
if(buf->mData == NULL)
continue;
copylen = buf->mDataByteSize / sizeof(float);
nfree = ac->bufsize - ac->bufrdavail - 1;
if(nfree == 0)
lsx_warn("coreaudio: unhandled buffer overrun. Data discarded.");
if(copylen > nfree)
copylen = nfree;
avail = ac->bufsize - ac->bufwr;
if(copylen > avail){
memcpy(ac->buf + ac->bufwr, buf->mData, avail * sizeof(float));
memcpy(ac->buf, (float*)buf->mData + avail, (copylen - avail) * sizeof(float));
}else{
memcpy(ac->buf + ac->bufwr, buf->mData, copylen * sizeof(float));
}
ac->bufwr += copylen;
if(ac->bufwr >= ac->bufsize)
ac->bufwr -= ac->bufsize;
ac->bufrdavail += copylen;
}
pthread_cond_signal(&ac->cond);
pthread_mutex_unlock(&ac->mutex);
return kAudioHardwareNoError;
}
static int setup(sox_format_t *ft, int is_input)
{
priv_t *ac = (priv_t *)ft->priv;
OSStatus status;
UInt32 property_size;
struct AudioStreamBasicDescription stream_desc;
int32_t buf_size;
int rc;
if (strncmp(ft->filename, "default", (size_t)7) == 0)
{
property_size = sizeof(ac->adid);
if (is_input)
status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultInputDevice, &property_size, &ac->adid);
else
status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, &property_size, &ac->adid);
}
else
{
Boolean is_writable;
status = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices, &property_size, &is_writable);
if (status == noErr)
{
int device_count = property_size/sizeof(AudioDeviceID);
AudioDeviceID *devices;
devices = malloc(property_size);
status = AudioHardwareGetProperty(kAudioHardwarePropertyDevices, &property_size, devices);
if (status == noErr)
{
int i;
for (i = 0; i < device_count; i++)
{
char name[256];
status = AudioDeviceGetProperty(devices[i],0,false,kAudioDevicePropertyDeviceName,&property_size,&name);
lsx_report("Found Audio Device \"%s\"\n",name);
/* String returned from OS is truncated so only compare
* as much as returned.
*/
if (strncmp(name,ft->filename,strlen(name)) == 0)
{
ac->adid = devices[i];
break;
}
}
}
free(devices);
}
}
if (status || ac->adid == kAudioDeviceUnknown)
{
lsx_fail_errno(ft, SOX_EPERM, "can not open audio device");
return SOX_EOF;
}
/* Query device to get initial values */
property_size = sizeof(struct AudioStreamBasicDescription);
status = AudioDeviceGetProperty(ac->adid, 0, is_input,
kAudioDevicePropertyStreamFormat,
&property_size, &stream_desc);
if (status)
{
lsx_fail_errno(ft, SOX_EPERM, "can not get audio device properties");
return SOX_EOF;
}
if (!(stream_desc.mFormatFlags & kLinearPCMFormatFlagIsFloat))
{
lsx_fail_errno(ft, SOX_EPERM, "audio device does not accept floats");
return SOX_EOF;
}
/* OS X effectively only supports these values. */
ft->signal.channels = 2;
ft->signal.rate = 44100;
ft->encoding.bits_per_sample = 32;
/* TODO: My limited experience with hardware can only get floats working
* withh a fixed sample rate and stereo. I know that is a limitiation of
* audio device I have so this may not be standard operating orders.
* If some hardware supports setting sample rates and channel counts
* then should do that over resampling and mixing.
*/
#if 0
stream_desc.mSampleRate = ft->signal.rate;
stream_desc.mChannelsPerFrame = ft->signal.channels;
/* Write them back */
property_size = sizeof(struct AudioStreamBasicDescription);
status = AudioDeviceSetProperty(ac->adid, NULL, 0, is_input,
kAudioDevicePropertyStreamFormat,
property_size, &stream_desc);
if (status)
{
lsx_fail_errno(ft, SOX_EPERM, "can not set audio device properties");
return SOX_EOF;
}
/* Query device to see if it worked */
property_size = sizeof(struct AudioStreamBasicDescription);
status = AudioDeviceGetProperty(ac->adid, 0, is_input,
kAudioDevicePropertyStreamFormat,
&property_size, &stream_desc);
if (status)
{
lsx_fail_errno(ft, SOX_EPERM, "can not get audio device properties");
return SOX_EOF;
}
#endif
if (stream_desc.mChannelsPerFrame != ft->signal.channels)
{
lsx_debug("audio device did not accept %d channels. Use %d channels instead.", (int)ft->signal.channels,
(int)stream_desc.mChannelsPerFrame);
ft->signal.channels = stream_desc.mChannelsPerFrame;
}
if (stream_desc.mSampleRate != ft->signal.rate)
{
lsx_debug("audio device did not accept %d sample rate. Use %d instead.", (int)ft->signal.rate,
(int)stream_desc.mSampleRate);
ft->signal.rate = stream_desc.mSampleRate;
}
ac->bufsize = sox_globals.bufsiz / sizeof(sox_sample_t) * Buffactor;
ac->bufrd = 0;
ac->bufwr = 0;
ac->bufrdavail = 0;
ac->buf = lsx_malloc(ac->bufsize * sizeof(float));
buf_size = sox_globals.bufsiz / sizeof(sox_sample_t) * sizeof(float);
property_size = sizeof(buf_size);
status = AudioDeviceSetProperty(ac->adid, NULL, 0, is_input,
kAudioDevicePropertyBufferSize,
property_size, &buf_size);
rc = pthread_mutex_init(&ac->mutex, NULL);
if (rc)
{
lsx_fail_errno(ft, SOX_EPERM, "failed initializing mutex");
return SOX_EOF;
}
rc = pthread_cond_init(&ac->cond, NULL);
if (rc)
{
lsx_fail_errno(ft, SOX_EPERM, "failed initializing condition");
return SOX_EOF;
}
ac->device_started = 0;
/* Registers callback with the device without activating it. */
if (is_input)
status = AudioDeviceAddIOProc(ac->adid, RecIOProc, (void *)ft);
else
status = AudioDeviceAddIOProc(ac->adid, PlaybackIOProc, (void *)ft);
return SOX_SUCCESS;
}
static int startread(sox_format_t *ft)
{
return setup(ft, 1);
}
static size_t read_samples(sox_format_t *ft, sox_sample_t *buf, size_t nsamp)
{
priv_t *ac = (priv_t *)ft->priv;
size_t len;
SOX_SAMPLE_LOCALS;
if (!ac->device_started) {
AudioDeviceStart(ac->adid, RecIOProc);
ac->device_started = 1;
}
pthread_mutex_lock(&ac->mutex);
/* Wait until input buffer has been filled by device driver */
while (ac->bufrdavail == 0)
pthread_cond_wait(&ac->cond, &ac->mutex);
len = 0;
while(len < nsamp && ac->bufrdavail > 0){
buf[len] = SOX_FLOAT_32BIT_TO_SAMPLE(ac->buf[ac->bufrd], ft->clips);
len++;
ac->bufrd++;
if(ac->bufrd == ac->bufsize)
ac->bufrd = 0;
ac->bufrdavail--;
}
pthread_mutex_unlock(&ac->mutex);
return len;
}
static int stopread(sox_format_t * ft)
{
priv_t *ac = (priv_t *)ft->priv;
AudioDeviceStop(ac->adid, RecIOProc);
AudioDeviceRemoveIOProc(ac->adid, RecIOProc);
pthread_cond_destroy(&ac->cond);
pthread_mutex_destroy(&ac->mutex);
free(ac->buf);
return SOX_SUCCESS;
}
static int startwrite(sox_format_t * ft)
{
return setup(ft, 0);
}
static size_t write_samples(sox_format_t *ft, const sox_sample_t *buf, size_t nsamp)
{
priv_t *ac = (priv_t *)ft->priv;
size_t i;
SOX_SAMPLE_LOCALS;
pthread_mutex_lock(&ac->mutex);
/* Wait to start until mutex is locked to help prevent callback
* getting zero samples.
*/
if(!ac->device_started){
if(AudioDeviceStart(ac->adid, PlaybackIOProc)){
pthread_mutex_unlock(&ac->mutex);
return SOX_EOF;
}
ac->device_started = 1;
}
/* globals.bufsize is in samples
* buf_offset is in bytes
* buf_size is in bytes
*/
for(i = 0; i < nsamp; i++){
while(ac->bufrdavail == ac->bufsize - 1)
pthread_cond_wait(&ac->cond, &ac->mutex);
ac->buf[ac->bufwr] = SOX_SAMPLE_TO_FLOAT_32BIT(buf[i], ft->clips);
ac->bufwr++;
if(ac->bufwr == ac->bufsize)
ac->bufwr = 0;
ac->bufrdavail++;
}
pthread_mutex_unlock(&ac->mutex);
return nsamp;
}
static int stopwrite(sox_format_t * ft)
{
priv_t *ac = (priv_t *)ft->priv;
if(ac->device_started){
pthread_mutex_lock(&ac->mutex);
while (ac->bufrdavail > 0)
pthread_cond_wait(&ac->cond, &ac->mutex);
pthread_mutex_unlock(&ac->mutex);
AudioDeviceStop(ac->adid, PlaybackIOProc);
}
AudioDeviceRemoveIOProc(ac->adid, PlaybackIOProc);
pthread_cond_destroy(&ac->cond);
pthread_mutex_destroy(&ac->mutex);
free(ac->buf);
return SOX_SUCCESS;
}
LSX_FORMAT_HANDLER(coreaudio)
{
static char const *const names[] = { "coreaudio", NULL };
static unsigned const write_encodings[] = {
SOX_ENCODING_FLOAT, 32, 0,
0};
static sox_format_handler_t const handler = {SOX_LIB_VERSION_CODE,
"Mac AudioCore device driver",
names, SOX_FILE_DEVICE | SOX_FILE_NOSTDIO,
startread, read_samples, stopread,
startwrite, write_samples, stopwrite,
NULL, write_encodings, NULL, sizeof(priv_t)
};
return &handler;
}