/* the Music Player Daemon (MPD) * Copyright (C) 2003-2007 by Warren Dukes (warren.dukes@gmail.com) * 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 "../output_api.h" #include <glib.h> #include <AudioUnit/AudioUnit.h> #undef G_LOG_DOMAIN #define G_LOG_DOMAIN "osx" struct osx_output { 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_init(G_GNUC_UNUSED const struct audio_format *audio_format, G_GNUC_UNUSED const struct config_param *param, G_GNUC_UNUSED GError **error) { struct osx_output *oo = g_new(struct osx_output, 1); 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; } static void osx_output_finish(void *data) { struct osx_output *od = data; g_free(od->buffer); g_mutex_free(od->mutex); g_cond_free(od->condition); g_free(od); } static void osx_output_cancel(void *data) { struct osx_output *od = data; g_mutex_lock(od->mutex); od->len = 0; g_mutex_unlock(od->mutex); } static void osx_output_close(void *data) { struct osx_output *od = data; g_mutex_lock(od->mutex); while (od->len) { g_cond_wait(od->condition, od->mutex); } g_mutex_unlock(od->mutex); 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); buffer_size = bytes_to_copy; 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_mutex_unlock(od->mutex); g_cond_signal(od->condition); buffer->mDataByteSize = buffer_size; if (!buffer_size) { g_usleep(1000); } return 0; } static bool osx_output_open(void *data, struct audio_format *audio_format, GError **error) { struct osx_output *od = data; ComponentDescription desc; Component comp; AURenderCallbackStruct callback; AudioStreamBasicDescription stream_description; OSStatus status; ComponentResult result; if (audio_format->bits > 16) audio_format->bits = 16; desc.componentType = kAudioUnitType_Output; desc.componentSubType = kAudioUnitSubType_DefaultOutput; 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(), 0, "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(), 0, "Unable to initialize OS X audio unit: %s", GetMacOSStatusCommentString(status)); 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(), 0, "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; #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; stream_description.mBitsPerChannel = audio_format->bits; 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(), 0, "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(), 0, "unable to start audio output: %s", GetMacOSStatusCommentString(status)); return false; } return true; } static size_t osx_output_play(void *data, const void *chunk, size_t size, G_GNUC_UNUSED GError **error) { struct osx_output *od = data; 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 osxPlugin = { .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, };