1 /*****************************************************************************
2 * audioqueue.c : AudioQueue audio output plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2000-2013 VLC authors and VideoLAN
7 * Authors: Romain Goyet <romain.goyet@likid.org>
8 * Felix Paul Kühne <fkuehne at videolan dot org>
10 * Rafaël Carré <funman at videolan dot org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
25 *****************************************************************************/
33 #import <vlc_common.h>
34 #import <vlc_plugin.h>
36 #import <AudioToolBox/AudioQueue.h>
39 #pragma mark private declarations
43 AudioQueueRef audioQueueRef;
44 AudioQueueTimelineRef timelineRef;
46 mtime_t i_played_length;
51 static int Open (vlc_object_t *);
52 static void Close (vlc_object_t *);
53 static void Play (audio_output_t *, block_t *);
54 static void Pause (audio_output_t *p_aout, bool pause, mtime_t date);
55 static void Flush (audio_output_t *p_aout, bool wait);
56 static int TimeGet (audio_output_t *aout, mtime_t *);
57 static void UnusedAudioQueueCallback (void *, AudioQueueRef, AudioQueueBufferRef);
59 static int Start(audio_output_t *, audio_sample_format_t *);
60 static void Stop(audio_output_t *);
61 static int VolumeSet(audio_output_t *, float );
64 set_shortname("AudioQueue")
65 set_description(N_("AudioQueue (iOS / Mac OS) audio output"))
66 set_capability("audio output", 40)
67 set_category(CAT_AUDIO)
68 set_subcategory(SUBCAT_AUDIO_AOUT)
69 add_shortcut("audioqueue")
70 set_callbacks(Open, Close)
74 #pragma mark initialization
76 static int Open(vlc_object_t *obj)
78 audio_output_t *aout = (audio_output_t *)obj;
79 aout_sys_t *sys = malloc(sizeof (*sys));
81 if (unlikely(sys == NULL))
87 aout->volume_set = VolumeSet;
90 aout_VolumeReport(aout, 1.0);
95 static void Close(vlc_object_t *obj)
97 audio_output_t *aout = (audio_output_t *)obj;
98 msg_Dbg( aout, "audioqueue: Close");
99 aout_sys_t *sys = aout->sys;
104 static int VolumeSet(audio_output_t * p_aout, float volume)
106 struct aout_sys_t *p_sys = p_aout->sys;
109 aout_VolumeReport(p_aout, volume);
110 p_sys->f_volume = volume;
112 /* Set volume for output unit */
113 ostatus = AudioQueueSetParameter(p_sys->audioQueueRef, kAudioQueueParam_Volume, volume * volume * volume);
118 static int Start(audio_output_t *p_aout, audio_sample_format_t *restrict fmt)
120 aout_sys_t *p_sys = p_aout->sys;
123 // prepare the format description for our output
124 AudioStreamBasicDescription streamDescription;
125 streamDescription.mSampleRate = fmt->i_rate;
126 streamDescription.mFormatID = kAudioFormatLinearPCM;
127 streamDescription.mFormatFlags = kAudioFormatFlagsNativeFloatPacked; // FL32
128 streamDescription.mFramesPerPacket = 1;
129 streamDescription.mChannelsPerFrame = 2;
130 streamDescription.mBitsPerChannel = 32;
131 streamDescription.mBytesPerFrame = streamDescription.mBitsPerChannel * streamDescription.mChannelsPerFrame / 8;
132 streamDescription.mBytesPerPacket = streamDescription.mBytesPerFrame * streamDescription.mFramesPerPacket;
134 // init new output instance
135 error = AudioQueueNewOutput(&streamDescription, // Format
136 UnusedAudioQueueCallback, // Unused Callback, which needs to be provided to have a proper instance
137 NULL, // User data, passed to the callback
139 kCFRunLoopCommonModes, // RunLoop mode
140 0, // Flags ; must be zero (per documentation)...
141 &(p_sys->audioQueueRef)); // Output
143 msg_Dbg(p_aout, "New AudioQueue instance created (status = %li)", error);
147 fmt->i_format = VLC_CODEC_FL32;
148 fmt->i_physical_channels = AOUT_CHANS_STEREO;
149 aout_FormatPrepare(fmt);
151 p_aout->sys->i_rate = fmt->i_rate;
154 error = AudioQueueStart(p_sys->audioQueueRef, NULL);
155 msg_Dbg(p_aout, "Starting AudioQueue (status = %li)", error);
157 // start timeline for synchro
158 error = AudioQueueCreateTimeline(p_sys->audioQueueRef, &p_sys->timelineRef);
159 msg_Dbg(p_aout, "AudioQueue Timeline started (status = %li)", error);
164 p_aout->time_get = TimeGet;
166 p_aout->pause = Pause;
167 p_aout->flush = Flush;
172 static void Stop(audio_output_t *p_aout)
174 p_aout->sys->i_played_length = 0;
176 AudioQueueDisposeTimeline(p_aout->sys->audioQueueRef, p_aout->sys->timelineRef);
177 AudioQueueStop(p_aout->sys->audioQueueRef, true);
178 AudioQueueDispose(p_aout->sys->audioQueueRef, true);
180 msg_Dbg(p_aout, "audioqueue stopped and disposed");
184 #pragma mark actual playback
186 static void Play(audio_output_t *p_aout, block_t *p_block)
188 AudioQueueBufferRef inBuffer = NULL;
191 status = AudioQueueAllocateBuffer(p_aout->sys->audioQueueRef, p_block->i_buffer, &inBuffer);
192 if (status != noErr) {
193 msg_Err(p_aout, "buffer alloction failed (%li)", status);
197 memcpy(inBuffer->mAudioData, p_block->p_buffer, p_block->i_buffer);
198 inBuffer->mAudioDataByteSize = p_block->i_buffer;
200 status = AudioQueueEnqueueBuffer(p_aout->sys->audioQueueRef, inBuffer, 0, NULL);
202 p_aout->sys->i_played_length += p_block->i_length;
204 msg_Err(p_aout, "enqueuing buffer failed (%li)", status);
206 block_Release(p_block);
209 void UnusedAudioQueueCallback(void * inUserData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer) {
210 /* this function does nothing, but needs to be here to make the AudioQueue API happy.
211 * without a callback, it will refuse to create an AudioQueue instance. */
212 VLC_UNUSED(inUserData);
214 VLC_UNUSED(inBuffer);
217 static void Pause(audio_output_t *p_aout, bool pause, mtime_t date)
222 AudioQueuePause(p_aout->sys->audioQueueRef);
224 AudioQueueStart(p_aout->sys->audioQueueRef, NULL);
227 static void Flush(audio_output_t *p_aout, bool wait)
229 if (!p_aout->sys->audioQueueRef)
232 AudioQueueDisposeTimeline(p_aout->sys->audioQueueRef, p_aout->sys->timelineRef);
235 AudioQueueStop(p_aout->sys->audioQueueRef, false);
237 AudioQueueStop(p_aout->sys->audioQueueRef, true);
239 p_aout->sys->i_played_length = 0;
240 AudioQueueStart(p_aout->sys->audioQueueRef, NULL);
241 AudioQueueCreateTimeline(p_aout->sys->audioQueueRef, &p_aout->sys->timelineRef);
244 static int TimeGet(audio_output_t *p_aout, mtime_t *restrict delay)
246 AudioTimeStamp outTimeStamp;
247 Boolean b_discontinuity;
248 OSStatus status = AudioQueueGetCurrentTime(p_aout->sys->audioQueueRef, p_aout->sys->timelineRef, &outTimeStamp, &b_discontinuity);
254 msg_Dbg(p_aout, "detected output discontinuity");
256 mtime_t i_pos = (mtime_t) outTimeStamp.mSampleTime * CLOCK_FREQ / p_aout->sys->i_rate;
257 *delay = p_aout->sys->i_played_length - i_pos;