1 /*****************************************************************************
2 * audiotrack.c: Android native AudioTrack audio output module
3 *****************************************************************************
4 * Copyright © 2012 VLC authors and VideoLAN
6 * Authors: Ming Hu <tewilove@gmail.com>
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by
10 * the Free Software Foundation; either version 2.1 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public License
19 * along with this program; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
21 *****************************************************************************/
27 #include <vlc_common.h>
28 #include <vlc_plugin.h>
34 #define SIZE_OF_AUDIOTRACK 256
36 /* From AudioSystem.h */
40 PCM_SUB_16_BIT = 0x1, // must be 1 for backward compatibility
41 PCM_SUB_8_BIT = 0x2 // must be 2 for backward compatibility
45 PCM = 0x00000000, // must be 0 for backward compatibility
46 PCM_16_BIT = (PCM|PCM_SUB_16_BIT),
47 PCM_8_BIT = (PCM|PCM_SUB_8_BIT)
51 CHANNEL_OUT_FRONT_LEFT = 0x4,
52 CHANNEL_OUT_FRONT_RIGHT = 0x8,
53 CHANNEL_OUT_FRONT_CENTER = 0x10,
54 CHANNEL_OUT_LOW_FREQUENCY = 0x20,
55 CHANNEL_OUT_BACK_LEFT = 0x40,
56 CHANNEL_OUT_BACK_RIGHT = 0x80,
57 CHANNEL_OUT_FRONT_LEFT_OF_CENTER = 0x100,
58 CHANNEL_OUT_FRONT_RIGHT_OF_CENTER = 0x200,
59 CHANNEL_OUT_BACK_CENTER = 0x400,
60 CHANNEL_OUT_MONO = CHANNEL_OUT_FRONT_LEFT,
61 CHANNEL_OUT_STEREO = (CHANNEL_OUT_FRONT_LEFT | CHANNEL_OUT_FRONT_RIGHT)
64 // _ZN7android11AudioSystem19getOutputFrameCountEPii
65 typedef int (*AudioSystem_getOutputFrameCount)(int *, int);
66 // _ZN7android11AudioSystem16getOutputLatencyEPji
67 typedef int (*AudioSystem_getOutputLatency)(unsigned int *, int);
68 // _ZN7android11AudioSystem21getOutputSamplingRateEPii
69 typedef int (*AudioSystem_getOutputSamplingRate)(int *, int);
71 // _ZN7android10AudioTrack16getMinFrameCountEPiij
72 typedef int (*AudioTrack_getMinFrameCount)(int *, int, unsigned int);
74 // _ZN7android10AudioTrackC1EijiiijPFviPvS1_ES1_ii
75 typedef void (*AudioTrack_ctor)(void *, int, unsigned int, int, int, int, unsigned int, void (*)(int, void *, void *), void *, int, int);
76 // _ZN7android10AudioTrackC1EijiiijPFviPvS1_ES1_i
77 typedef void (*AudioTrack_ctor_legacy)(void *, int, unsigned int, int, int, int, unsigned int, void (*)(int, void *, void *), void *, int);
78 // _ZN7android10AudioTrackD1Ev
79 typedef void (*AudioTrack_dtor)(void *);
80 // _ZNK7android10AudioTrack9initCheckEv
81 typedef int (*AudioTrack_initCheck)(void *);
82 // _ZN7android10AudioTrack5startEv
83 typedef int (*AudioTrack_start)(void *);
84 // _ZN7android10AudioTrack4stopEv
85 typedef int (*AudioTrack_stop)(void *);
86 // _ZN7android10AudioTrack5writeEPKvj
87 typedef int (*AudioTrack_write)(void *, void const*, unsigned int);
88 // _ZN7android10AudioTrack5flushEv
89 typedef int (*AudioTrack_flush)(void *);
90 // _ZN7android10AudioTrack5pauseEv
91 typedef int (*AudioTrack_pause)(void *);
100 AudioSystem_getOutputFrameCount as_getOutputFrameCount;
101 AudioSystem_getOutputLatency as_getOutputLatency;
102 AudioSystem_getOutputSamplingRate as_getOutputSamplingRate;
104 AudioTrack_getMinFrameCount at_getMinFrameCount;
105 AudioTrack_ctor at_ctor;
106 AudioTrack_ctor_legacy at_ctor_legacy;
107 AudioTrack_dtor at_dtor;
108 AudioTrack_initCheck at_initCheck;
109 AudioTrack_start at_start;
110 AudioTrack_stop at_stop;
111 AudioTrack_write at_write;
112 AudioTrack_flush at_flush;
113 AudioTrack_pause at_pause;
116 /* Soft volume helper */
119 static void *InitLibrary(struct aout_sys_t *p_sys);
121 static int Open(vlc_object_t *);
122 static void Close(vlc_object_t *);
123 static void Play(audio_output_t*, block_t*);
124 static void Pause (audio_output_t *, bool, mtime_t);
127 set_shortname("AudioTrack")
128 set_description(N_("Android AudioTrack audio output"))
129 set_capability("audio output", 225)
130 set_category(CAT_AUDIO)
131 set_subcategory(SUBCAT_AUDIO_AOUT)
132 add_shortcut("android")
133 set_callbacks(Open, Close)
136 static void *InitLibrary(struct aout_sys_t *p_sys)
138 /* DL Open libmedia */
140 p_library = dlopen("libmedia.so", RTLD_NOW|RTLD_LOCAL);
144 /* Register symbols */
145 p_sys->as_getOutputFrameCount = (AudioSystem_getOutputFrameCount)(dlsym(p_library, "_ZN7android11AudioSystem19getOutputFrameCountEPii"));
146 p_sys->as_getOutputLatency = (AudioSystem_getOutputLatency)(dlsym(p_library, "_ZN7android11AudioSystem16getOutputLatencyEPji"));
147 if(p_sys->as_getOutputLatency == NULL) {
148 /* 4.1 Jellybean prototype */
149 p_sys->as_getOutputLatency = (AudioSystem_getOutputLatency)(dlsym(p_library, "_ZN7android11AudioSystem16getOutputLatencyEPj19audio_stream_type_t"));
151 p_sys->as_getOutputSamplingRate = (AudioSystem_getOutputSamplingRate)(dlsym(p_library, "_ZN7android11AudioSystem21getOutputSamplingRateEPii"));
152 p_sys->at_getMinFrameCount = (AudioTrack_getMinFrameCount)(dlsym(p_library, "_ZN7android10AudioTrack16getMinFrameCountEPiij"));
153 if(p_sys->at_getMinFrameCount == NULL) {
154 /* 4.1 Jellybean prototype */
155 p_sys->at_getMinFrameCount = (AudioTrack_getMinFrameCount)(dlsym(p_library, "_ZN7android10AudioTrack16getMinFrameCountEPi19audio_stream_type_tj"));
157 p_sys->at_ctor = (AudioTrack_ctor)(dlsym(p_library, "_ZN7android10AudioTrackC1EijiiijPFviPvS1_ES1_ii"));
158 p_sys->at_ctor_legacy = (AudioTrack_ctor_legacy)(dlsym(p_library, "_ZN7android10AudioTrackC1EijiiijPFviPvS1_ES1_i"));
159 p_sys->at_dtor = (AudioTrack_dtor)(dlsym(p_library, "_ZN7android10AudioTrackD1Ev"));
160 p_sys->at_initCheck = (AudioTrack_initCheck)(dlsym(p_library, "_ZNK7android10AudioTrack9initCheckEv"));
161 p_sys->at_start = (AudioTrack_start)(dlsym(p_library, "_ZN7android10AudioTrack5startEv"));
162 p_sys->at_stop = (AudioTrack_stop)(dlsym(p_library, "_ZN7android10AudioTrack4stopEv"));
163 p_sys->at_write = (AudioTrack_write)(dlsym(p_library, "_ZN7android10AudioTrack5writeEPKvj"));
164 p_sys->at_flush = (AudioTrack_flush)(dlsym(p_library, "_ZN7android10AudioTrack5flushEv"));
165 p_sys->at_pause = (AudioTrack_pause)(dlsym(p_library, "_ZN7android10AudioTrack5pauseEv"));
167 /* We need the first 3 or the last 1 */
168 if (!((p_sys->as_getOutputFrameCount && p_sys->as_getOutputLatency && p_sys->as_getOutputSamplingRate)
169 || p_sys->at_getMinFrameCount)) {
174 // We need all the other Symbols
175 if (!((p_sys->at_ctor || p_sys->at_ctor_legacy) && p_sys->at_dtor && p_sys->at_initCheck &&
176 p_sys->at_start && p_sys->at_stop && p_sys->at_write && p_sys->at_flush)) {
183 static int Start(audio_output_t *aout, audio_sample_format_t *restrict fmt)
185 struct aout_sys_t *p_sys = aout->sys;
188 int afSampleRate, afFrameCount, afLatency, minBufCount, minFrameCount;
189 int stream_type, channel, rate, format;
191 /* 4000 <= frequency <= 48000 */
200 /* We can only accept U8 and S16L */
201 if (fmt->i_format != VLC_CODEC_U8 && fmt->i_format != VLC_CODEC_S16L)
202 fmt->i_format = VLC_CODEC_S16L;
203 format = (fmt->i_format == VLC_CODEC_S16L) ? PCM_16_BIT : PCM_8_BIT;
205 /* TODO: android supports more channels */
206 fmt->i_original_channels = fmt->i_physical_channels;
207 switch(aout_FormatNbChannels(fmt))
210 channel = CHANNEL_OUT_MONO;
211 fmt->i_physical_channels = AOUT_CHAN_CENTER;
215 channel = CHANNEL_OUT_STEREO;
216 fmt->i_physical_channels = AOUT_CHANS_STEREO;
220 /* Get the minimum buffer value */
221 if (!p_sys->at_getMinFrameCount) {
222 status = p_sys->as_getOutputSamplingRate(&afSampleRate, stream_type);
223 status ^= p_sys->as_getOutputFrameCount(&afFrameCount, stream_type);
224 status ^= p_sys->as_getOutputLatency((uint32_t*)(&afLatency), stream_type);
226 msg_Err(aout, "Could not query the AudioStream parameters");
229 minBufCount = afLatency / ((1000 * afFrameCount) / afSampleRate);
232 minFrameCount = (afFrameCount * rate * minBufCount) / afSampleRate;
235 status = p_sys->at_getMinFrameCount(&minFrameCount, stream_type, rate);
237 msg_Err(aout, "Could not query the AudioTrack parameters");
242 size = minFrameCount * (channel == CHANNEL_OUT_STEREO ? 2 : 1) * 4;
244 /* Sizeof(AudioTrack) == 0x58 (not sure) on 2.2.1, this should be enough */
245 p_sys->AudioTrack = malloc(SIZE_OF_AUDIOTRACK);
246 if (!p_sys->AudioTrack)
249 *((uint32_t *) ((uint32_t)p_sys->AudioTrack + SIZE_OF_AUDIOTRACK - 4)) = 0xbaadbaad;
250 // Higher than android 2.2
252 p_sys->at_ctor(p_sys->AudioTrack, stream_type, rate, format, channel, size, 0, NULL, NULL, 0, 0);
253 // Higher than android 1.6
254 else if (p_sys->at_ctor_legacy)
255 p_sys->at_ctor_legacy(p_sys->AudioTrack, stream_type, rate, format, channel, size, 0, NULL, NULL, 0);
257 assert( (*((uint32_t *) ((uint32_t)p_sys->AudioTrack + SIZE_OF_AUDIOTRACK - 4)) == 0xbaadbaad) );
260 status = p_sys->at_initCheck(p_sys->AudioTrack);
262 /* android 1.6 uses channel count instead of stream_type */
264 channel = (channel == CHANNEL_OUT_STEREO) ? 2 : 1;
265 p_sys->at_ctor_legacy(p_sys->AudioTrack, stream_type, rate, format, channel, size, 0, NULL, NULL, 0);
266 status = p_sys->at_initCheck(p_sys->AudioTrack);
269 msg_Err(aout, "Cannot create AudioTrack!");
270 free(p_sys->AudioTrack);
274 aout_SoftVolumeStart(aout);
277 aout->time_get = NULL;
281 p_sys->at_start(p_sys->AudioTrack);
288 static void Stop(audio_output_t* p_aout)
290 aout_sys_t *p_sys = p_aout->sys;
292 p_sys->at_stop(p_sys->AudioTrack);
293 p_sys->at_flush(p_sys->AudioTrack);
294 p_sys->at_dtor(p_sys->AudioTrack);
295 free(p_sys->AudioTrack);
299 static void Play(audio_output_t* p_aout, block_t* p_buffer)
301 aout_sys_t *p_sys = p_aout->sys;
304 while (length < p_buffer->i_buffer) {
305 length += p_sys->at_write(p_sys->AudioTrack, (char*)(p_buffer->p_buffer) + length, p_buffer->i_buffer - length);
308 block_Release( p_buffer );
311 static void Pause(audio_output_t *p_aout, bool pause, mtime_t date)
315 aout_sys_t *p_sys = p_aout->sys;
318 p_sys->at_pause(p_sys->AudioTrack);
320 p_sys->at_start(p_sys->AudioTrack);
324 static int Open(vlc_object_t *obj)
326 audio_output_t *aout = (audio_output_t *)obj;
327 aout_sys_t *sys = malloc(sizeof (*sys));
329 if (unlikely(sys == NULL))
332 sys->libmedia = InitLibrary(sys);
333 if (sys->libmedia == NULL) {
334 msg_Err(aout, "Could not initialize libmedia.so!");
342 aout_SoftVolumeInit(aout);
346 static void Close(vlc_object_t *obj)
348 audio_output_t *aout = (audio_output_t *)obj;
349 aout_sys_t *sys = aout->sys;
351 dlclose(sys->libmedia);