mpd/src/output/osx_output_plugin.c

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/*
2011-01-29 10:13:54 +01:00
* Copyright (C) 2003-2011 The Music Player Daemon Project
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include "osx_output_plugin.h"
#include "output_api.h"
#include <glib.h>
#include <AudioUnit/AudioUnit.h>
#include <CoreServices/CoreServices.h>
#undef G_LOG_DOMAIN
#define G_LOG_DOMAIN "osx"
struct osx_output {
struct audio_output base;
/* configuration settings */
OSType component_subtype;
/* only applicable with kAudioUnitSubType_HALOutput */
const char *device_name;
AudioUnit au;
GMutex *mutex;
GCond *condition;
char *buffer;
size_t buffer_size;
size_t pos;
size_t len;
};
/**
* The quark used for GError.domain.
*/
static inline GQuark
osx_output_quark(void)
{
return g_quark_from_static_string("osx_output");
}
static bool
osx_output_test_default_device(void)
{
/* on a Mac, this is always the default plugin, if nothing
else is configured */
return true;
}
static void
osx_output_configure(struct osx_output *oo, const struct config_param *param)
{
const char *device = config_get_block_string(param, "device", NULL);
if (device == NULL || 0 == strcmp(device, "default")) {
oo->component_subtype = kAudioUnitSubType_DefaultOutput;
oo->device_name = NULL;
}
else if (0 == strcmp(device, "system")) {
oo->component_subtype = kAudioUnitSubType_SystemOutput;
oo->device_name = NULL;
}
else {
oo->component_subtype = kAudioUnitSubType_HALOutput;
/* XXX am I supposed to g_strdup() this? */
oo->device_name = device;
}
}
static struct audio_output *
osx_output_init(const struct config_param *param, GError **error_r)
{
struct osx_output *oo = g_new(struct osx_output, 1);
if (!ao_base_init(&oo->base, &osx_output_plugin, param, error_r)) {
g_free(oo);
return NULL;
}
osx_output_configure(oo, param);
oo->mutex = g_mutex_new();
oo->condition = g_cond_new();
oo->pos = 0;
oo->len = 0;
oo->buffer = NULL;
oo->buffer_size = 0;
return &oo->base;
}
static void
osx_output_finish(struct audio_output *ao)
{
struct osx_output *od = (struct osx_output *)ao;
g_free(od->buffer);
g_mutex_free(od->mutex);
g_cond_free(od->condition);
g_free(od);
}
static void
osx_output_cancel(struct audio_output *ao)
{
struct osx_output *od = (struct osx_output *)ao;
g_mutex_lock(od->mutex);
od->len = 0;
g_mutex_unlock(od->mutex);
}
static void
osx_output_close(struct audio_output *ao)
{
struct osx_output *od = (struct osx_output *)ao;
AudioOutputUnitStop(od->au);
AudioUnitUninitialize(od->au);
CloseComponent(od->au);
}
static OSStatus
osx_render(void *vdata,
G_GNUC_UNUSED AudioUnitRenderActionFlags *io_action_flags,
G_GNUC_UNUSED const AudioTimeStamp *in_timestamp,
G_GNUC_UNUSED UInt32 in_bus_number,
G_GNUC_UNUSED UInt32 in_number_frames,
AudioBufferList *buffer_list)
{
struct osx_output *od = (struct osx_output *) vdata;
AudioBuffer *buffer = &buffer_list->mBuffers[0];
size_t buffer_size = buffer->mDataByteSize;
size_t bytes_to_copy;
size_t trailer_length;
size_t dest_pos = 0;
g_mutex_lock(od->mutex);
bytes_to_copy = MIN(od->len, buffer_size);
od->len -= bytes_to_copy;
trailer_length = od->buffer_size - od->pos;
if (bytes_to_copy > trailer_length) {
memcpy((unsigned char*)buffer->mData + dest_pos,
od->buffer + od->pos, trailer_length);
od->pos = 0;
dest_pos += trailer_length;
bytes_to_copy -= trailer_length;
}
memcpy((unsigned char*)buffer->mData + dest_pos,
od->buffer + od->pos, bytes_to_copy);
od->pos += bytes_to_copy;
if (od->pos >= od->buffer_size)
od->pos = 0;
g_cond_signal(od->condition);
g_mutex_unlock(od->mutex);
if (bytes_to_copy < buffer_size)
memset((unsigned char*)buffer->mData + bytes_to_copy, 0,
buffer_size - bytes_to_copy);
return 0;
}
static bool
osx_output_set_device(struct osx_output *oo, GError **error)
{
bool ret = true;
OSStatus status;
UInt32 size, numdevices;
AudioDeviceID *deviceids = NULL;
char name[256];
unsigned int i;
if (oo->component_subtype != kAudioUnitSubType_HALOutput)
goto done;
/* how many audio devices are there? */
status = AudioHardwareGetPropertyInfo(kAudioHardwarePropertyDevices,
&size,
NULL);
if (status != noErr) {
g_set_error(error, osx_output_quark(), status,
"Unable to determine number of OS X audio devices: %s",
GetMacOSStatusCommentString(status));
ret = false;
goto done;
}
/* what are the available audio device IDs? */
numdevices = size / sizeof(AudioDeviceID);
deviceids = g_malloc(size);
status = AudioHardwareGetProperty(kAudioHardwarePropertyDevices,
&size,
deviceids);
if (status != noErr) {
g_set_error(error, osx_output_quark(), status,
"Unable to determine OS X audio device IDs: %s",
GetMacOSStatusCommentString(status));
ret = false;
goto done;
}
/* which audio device matches oo->device_name? */
for (i = 0; i < numdevices; i++) {
size = sizeof(name);
status = AudioDeviceGetProperty(deviceids[i], 0, false,
kAudioDevicePropertyDeviceName,
&size, name);
if (status != noErr) {
g_set_error(error, osx_output_quark(), status,
"Unable to determine OS X device name "
"(device %u): %s",
(unsigned int) deviceids[i],
GetMacOSStatusCommentString(status));
ret = false;
goto done;
}
if (strcmp(oo->device_name, name) == 0) {
g_debug("found matching device: ID=%u, name=%s",
(unsigned int) deviceids[i], name);
break;
}
}
if (i == numdevices) {
g_warning("Found no audio device with name '%s' "
"(will use default audio device)",
oo->device_name);
goto done;
}
status = AudioUnitSetProperty(oo->au,
kAudioOutputUnitProperty_CurrentDevice,
kAudioUnitScope_Global,
0,
&(deviceids[i]),
sizeof(AudioDeviceID));
if (status != noErr) {
g_set_error(error, osx_output_quark(), status,
"Unable to set OS X audio output device: %s",
GetMacOSStatusCommentString(status));
ret = false;
goto done;
}
g_debug("set OS X audio output device ID=%u, name=%s",
(unsigned int) deviceids[i], name);
done:
if (deviceids != NULL)
g_free(deviceids);
return ret;
}
static bool
osx_output_open(struct audio_output *ao, struct audio_format *audio_format, GError **error)
{
struct osx_output *od = (struct osx_output *)ao;
ComponentDescription desc;
Component comp;
AURenderCallbackStruct callback;
AudioStreamBasicDescription stream_description;
OSStatus status;
ComponentResult result;
desc.componentType = kAudioUnitType_Output;
desc.componentSubType = od->component_subtype;
desc.componentManufacturer = kAudioUnitManufacturer_Apple;
desc.componentFlags = 0;
desc.componentFlagsMask = 0;
comp = FindNextComponent(NULL, &desc);
if (comp == 0) {
g_set_error(error, osx_output_quark(), 0,
"Error finding OS X component");
return false;
}
status = OpenAComponent(comp, &od->au);
if (status != noErr) {
g_set_error(error, osx_output_quark(), status,
"Unable to open OS X component: %s",
GetMacOSStatusCommentString(status));
return false;
}
status = AudioUnitInitialize(od->au);
if (status != noErr) {
CloseComponent(od->au);
g_set_error(error, osx_output_quark(), status,
"Unable to initialize OS X audio unit: %s",
GetMacOSStatusCommentString(status));
return false;
}
if (!osx_output_set_device(od, error))
return false;
callback.inputProc = osx_render;
callback.inputProcRefCon = od;
result = AudioUnitSetProperty(od->au,
kAudioUnitProperty_SetRenderCallback,
kAudioUnitScope_Input, 0,
&callback, sizeof(callback));
if (result != noErr) {
AudioUnitUninitialize(od->au);
CloseComponent(od->au);
g_set_error(error, osx_output_quark(), result,
"unable to set callback for OS X audio unit");
return false;
}
stream_description.mSampleRate = audio_format->sample_rate;
stream_description.mFormatID = kAudioFormatLinearPCM;
stream_description.mFormatFlags = kLinearPCMFormatFlagIsSignedInteger;
switch (audio_format->format) {
case SAMPLE_FORMAT_S8:
stream_description.mBitsPerChannel = 8;
break;
case SAMPLE_FORMAT_S16:
stream_description.mBitsPerChannel = 16;
break;
default:
audio_format->format = SAMPLE_FORMAT_S16;
stream_description.mBitsPerChannel = 16;
break;
}
#if G_BYTE_ORDER == G_BIG_ENDIAN
stream_description.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
#endif
stream_description.mBytesPerPacket =
audio_format_frame_size(audio_format);
stream_description.mFramesPerPacket = 1;
stream_description.mBytesPerFrame = stream_description.mBytesPerPacket;
stream_description.mChannelsPerFrame = audio_format->channels;
result = AudioUnitSetProperty(od->au, kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 0,
&stream_description,
sizeof(stream_description));
if (result != noErr) {
AudioUnitUninitialize(od->au);
CloseComponent(od->au);
g_set_error(error, osx_output_quark(), result,
"Unable to set format on OS X device");
return false;
}
/* create a buffer of 1s */
od->buffer_size = (audio_format->sample_rate) *
audio_format_frame_size(audio_format);
od->buffer = g_realloc(od->buffer, od->buffer_size);
od->pos = 0;
od->len = 0;
status = AudioOutputUnitStart(od->au);
if (status != 0) {
g_set_error(error, osx_output_quark(), status,
"unable to start audio output: %s",
GetMacOSStatusCommentString(status));
return false;
}
return true;
}
static size_t
osx_output_play(struct audio_output *ao, const void *chunk, size_t size,
G_GNUC_UNUSED GError **error)
{
struct osx_output *od = (struct osx_output *)ao;
size_t start, nbytes;
g_mutex_lock(od->mutex);
while (od->len >= od->buffer_size)
/* wait for some free space in the buffer */
g_cond_wait(od->condition, od->mutex);
start = od->pos + od->len;
if (start >= od->buffer_size)
start -= od->buffer_size;
nbytes = start < od->pos
? od->pos - start
: od->buffer_size - start;
assert(nbytes > 0);
if (nbytes > size)
nbytes = size;
memcpy(od->buffer + start, chunk, nbytes);
od->len += nbytes;
g_mutex_unlock(od->mutex);
return nbytes;
}
const struct audio_output_plugin osx_output_plugin = {
.name = "osx",
.test_default_device = osx_output_test_default_device,
.init = osx_output_init,
.finish = osx_output_finish,
.open = osx_output_open,
.close = osx_output_close,
.play = osx_output_play,
.cancel = osx_output_cancel,
};