/* * 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 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 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_enable(struct audio_output *ao, GError **error_r) { struct osx_output *oo = (struct osx_output *)ao; ComponentDescription desc; desc.componentType = kAudioUnitType_Output; desc.componentSubType = oo->component_subtype; desc.componentManufacturer = kAudioUnitManufacturer_Apple; desc.componentFlags = 0; desc.componentFlagsMask = 0; Component comp = FindNextComponent(NULL, &desc); if (comp == 0) { g_set_error(error_r, osx_output_quark(), 0, "Error finding OS X component"); return false; } OSStatus status = OpenAComponent(comp, &oo->au); if (status != noErr) { g_set_error(error_r, osx_output_quark(), status, "Unable to open OS X component: %s", GetMacOSStatusCommentString(status)); return false; } if (!osx_output_set_device(oo, error_r)) { CloseComponent(oo->au); return false; } AURenderCallbackStruct callback; callback.inputProc = osx_render; callback.inputProcRefCon = oo; ComponentResult result = AudioUnitSetProperty(oo->au, kAudioUnitProperty_SetRenderCallback, kAudioUnitScope_Input, 0, &callback, sizeof(callback)); if (result != noErr) { CloseComponent(oo->au); g_set_error(error_r, osx_output_quark(), result, "unable to set callback for OS X audio unit"); return false; } return true; } static void osx_output_disable(struct audio_output *ao) { struct osx_output *oo = (struct osx_output *)ao; CloseComponent(oo->au); } 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); } static bool osx_output_open(struct audio_output *ao, struct audio_format *audio_format, GError **error) { struct osx_output *od = (struct osx_output *)ao; AudioStreamBasicDescription stream_description; 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; case SAMPLE_FORMAT_S32: stream_description.mBitsPerChannel = 32; break; default: audio_format->format = SAMPLE_FORMAT_S32; stream_description.mBitsPerChannel = 32; 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; ComponentResult result = AudioUnitSetProperty(od->au, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &stream_description, sizeof(stream_description)); if (result != noErr) { g_set_error(error, osx_output_quark(), result, "Unable to set format on OS X device"); return false; } OSStatus status = AudioUnitInitialize(od->au); if (status != noErr) { g_set_error(error, osx_output_quark(), status, "Unable to initialize OS X audio unit: %s", GetMacOSStatusCommentString(status)); 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) { AudioUnitUninitialize(od->au); 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, .enable = osx_output_enable, .disable = osx_output_disable, .open = osx_output_open, .close = osx_output_close, .play = osx_output_play, .cancel = osx_output_cancel, };