Imported Debian version 2.5.2~trusty
[deb_ffmpeg.git] / ffmpeg / libavdevice / pulse_audio_dec.c
1 /*
2 * Pulseaudio input
3 * Copyright (c) 2011 Luca Barbato <lu_zero@gentoo.org>
4 * Copyright 2004-2006 Lennart Poettering
5 * Copyright (c) 2014 Michael Niedermayer <michaelni@gmx.at>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #include <pulse/rtclock.h>
25 #include <pulse/error.h>
26 #include "libavformat/avformat.h"
27 #include "libavformat/internal.h"
28 #include "libavutil/opt.h"
29 #include "libavutil/time.h"
30 #include "pulse_audio_common.h"
31 #include "timefilter.h"
32
33 #define DEFAULT_CODEC_ID AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE)
34
35 typedef struct PulseData {
36 AVClass *class;
37 char *server;
38 char *name;
39 char *stream_name;
40 int sample_rate;
41 int channels;
42 int frame_size;
43 int fragment_size;
44
45 pa_threaded_mainloop *mainloop;
46 pa_context *context;
47 pa_stream *stream;
48
49 TimeFilter *timefilter;
50 int last_period;
51 int wallclock;
52 } PulseData;
53
54
55 #define CHECK_SUCCESS_GOTO(rerror, expression, label) \
56 do { \
57 if (!(expression)) { \
58 rerror = AVERROR_EXTERNAL; \
59 goto label; \
60 } \
61 } while(0);
62
63 #define CHECK_DEAD_GOTO(p, rerror, label) \
64 do { \
65 if (!(p)->context || !PA_CONTEXT_IS_GOOD(pa_context_get_state((p)->context)) || \
66 !(p)->stream || !PA_STREAM_IS_GOOD(pa_stream_get_state((p)->stream))) { \
67 rerror = AVERROR_EXTERNAL; \
68 goto label; \
69 } \
70 } while(0);
71
72 static void context_state_cb(pa_context *c, void *userdata) {
73 PulseData *p = userdata;
74
75 switch (pa_context_get_state(c)) {
76 case PA_CONTEXT_READY:
77 case PA_CONTEXT_TERMINATED:
78 case PA_CONTEXT_FAILED:
79 pa_threaded_mainloop_signal(p->mainloop, 0);
80 break;
81 }
82 }
83
84 static void stream_state_cb(pa_stream *s, void * userdata) {
85 PulseData *p = userdata;
86
87 switch (pa_stream_get_state(s)) {
88 case PA_STREAM_READY:
89 case PA_STREAM_FAILED:
90 case PA_STREAM_TERMINATED:
91 pa_threaded_mainloop_signal(p->mainloop, 0);
92 break;
93 }
94 }
95
96 static void stream_request_cb(pa_stream *s, size_t length, void *userdata) {
97 PulseData *p = userdata;
98
99 pa_threaded_mainloop_signal(p->mainloop, 0);
100 }
101
102 static void stream_latency_update_cb(pa_stream *s, void *userdata) {
103 PulseData *p = userdata;
104
105 pa_threaded_mainloop_signal(p->mainloop, 0);
106 }
107
108 static av_cold int pulse_close(AVFormatContext *s)
109 {
110 PulseData *pd = s->priv_data;
111
112 if (pd->mainloop)
113 pa_threaded_mainloop_stop(pd->mainloop);
114
115 if (pd->stream)
116 pa_stream_unref(pd->stream);
117 pd->stream = NULL;
118
119 if (pd->context) {
120 pa_context_disconnect(pd->context);
121 pa_context_unref(pd->context);
122 }
123 pd->context = NULL;
124
125 if (pd->mainloop)
126 pa_threaded_mainloop_free(pd->mainloop);
127 pd->mainloop = NULL;
128
129 ff_timefilter_destroy(pd->timefilter);
130 pd->timefilter = NULL;
131
132 return 0;
133 }
134
135 static av_cold int pulse_read_header(AVFormatContext *s)
136 {
137 PulseData *pd = s->priv_data;
138 AVStream *st;
139 char *device = NULL;
140 int ret;
141 enum AVCodecID codec_id =
142 s->audio_codec_id == AV_CODEC_ID_NONE ? DEFAULT_CODEC_ID : s->audio_codec_id;
143 const pa_sample_spec ss = { ff_codec_id_to_pulse_format(codec_id),
144 pd->sample_rate,
145 pd->channels };
146
147 pa_buffer_attr attr = { -1 };
148
149 st = avformat_new_stream(s, NULL);
150
151 if (!st) {
152 av_log(s, AV_LOG_ERROR, "Cannot add stream\n");
153 return AVERROR(ENOMEM);
154 }
155
156 attr.fragsize = pd->fragment_size;
157
158 if (s->filename[0] != '\0' && strcmp(s->filename, "default"))
159 device = s->filename;
160
161 if (!(pd->mainloop = pa_threaded_mainloop_new())) {
162 pulse_close(s);
163 return AVERROR_EXTERNAL;
164 }
165
166 if (!(pd->context = pa_context_new(pa_threaded_mainloop_get_api(pd->mainloop), pd->name))) {
167 pulse_close(s);
168 return AVERROR_EXTERNAL;
169 }
170
171 pa_context_set_state_callback(pd->context, context_state_cb, pd);
172
173 if (pa_context_connect(pd->context, pd->server, 0, NULL) < 0) {
174 pulse_close(s);
175 return AVERROR(pa_context_errno(pd->context));
176 }
177
178 pa_threaded_mainloop_lock(pd->mainloop);
179
180 if (pa_threaded_mainloop_start(pd->mainloop) < 0) {
181 ret = -1;
182 goto unlock_and_fail;
183 }
184
185 for (;;) {
186 pa_context_state_t state;
187
188 state = pa_context_get_state(pd->context);
189
190 if (state == PA_CONTEXT_READY)
191 break;
192
193 if (!PA_CONTEXT_IS_GOOD(state)) {
194 ret = AVERROR(pa_context_errno(pd->context));
195 goto unlock_and_fail;
196 }
197
198 /* Wait until the context is ready */
199 pa_threaded_mainloop_wait(pd->mainloop);
200 }
201
202 if (!(pd->stream = pa_stream_new(pd->context, pd->stream_name, &ss, NULL))) {
203 ret = AVERROR(pa_context_errno(pd->context));
204 goto unlock_and_fail;
205 }
206
207 pa_stream_set_state_callback(pd->stream, stream_state_cb, pd);
208 pa_stream_set_read_callback(pd->stream, stream_request_cb, pd);
209 pa_stream_set_write_callback(pd->stream, stream_request_cb, pd);
210 pa_stream_set_latency_update_callback(pd->stream, stream_latency_update_cb, pd);
211
212 ret = pa_stream_connect_record(pd->stream, device, &attr,
213 PA_STREAM_INTERPOLATE_TIMING
214 |PA_STREAM_ADJUST_LATENCY
215 |PA_STREAM_AUTO_TIMING_UPDATE);
216
217 if (ret < 0) {
218 ret = AVERROR(pa_context_errno(pd->context));
219 goto unlock_and_fail;
220 }
221
222 for (;;) {
223 pa_stream_state_t state;
224
225 state = pa_stream_get_state(pd->stream);
226
227 if (state == PA_STREAM_READY)
228 break;
229
230 if (!PA_STREAM_IS_GOOD(state)) {
231 ret = AVERROR(pa_context_errno(pd->context));
232 goto unlock_and_fail;
233 }
234
235 /* Wait until the stream is ready */
236 pa_threaded_mainloop_wait(pd->mainloop);
237 }
238
239 pa_threaded_mainloop_unlock(pd->mainloop);
240
241 /* take real parameters */
242 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
243 st->codec->codec_id = codec_id;
244 st->codec->sample_rate = pd->sample_rate;
245 st->codec->channels = pd->channels;
246 avpriv_set_pts_info(st, 64, 1, 1000000); /* 64 bits pts in us */
247
248 pd->timefilter = ff_timefilter_new(1000000.0 / pd->sample_rate,
249 1000, 1.5E-6);
250
251 if (!pd->timefilter) {
252 pulse_close(s);
253 return AVERROR(ENOMEM);
254 }
255
256 return 0;
257
258 unlock_and_fail:
259 pa_threaded_mainloop_unlock(pd->mainloop);
260
261 pulse_close(s);
262 return ret;
263 }
264
265 static int pulse_read_packet(AVFormatContext *s, AVPacket *pkt)
266 {
267 PulseData *pd = s->priv_data;
268 int ret;
269 size_t read_length;
270 const void *read_data = NULL;
271 int64_t dts;
272 pa_usec_t latency;
273 int negative;
274
275 pa_threaded_mainloop_lock(pd->mainloop);
276
277 CHECK_DEAD_GOTO(pd, ret, unlock_and_fail);
278
279 while (!read_data) {
280 int r;
281
282 r = pa_stream_peek(pd->stream, &read_data, &read_length);
283 CHECK_SUCCESS_GOTO(ret, r == 0, unlock_and_fail);
284
285 if (read_length <= 0) {
286 pa_threaded_mainloop_wait(pd->mainloop);
287 CHECK_DEAD_GOTO(pd, ret, unlock_and_fail);
288 } else if (!read_data) {
289 /* There's a hole in the stream, skip it. We could generate
290 * silence, but that wouldn't work for compressed streams. */
291 r = pa_stream_drop(pd->stream);
292 CHECK_SUCCESS_GOTO(ret, r == 0, unlock_and_fail);
293 }
294 }
295
296 if (av_new_packet(pkt, read_length) < 0) {
297 ret = AVERROR(ENOMEM);
298 goto unlock_and_fail;
299 }
300
301 dts = av_gettime();
302 pa_operation_unref(pa_stream_update_timing_info(pd->stream, NULL, NULL));
303
304 if (pa_stream_get_latency(pd->stream, &latency, &negative) >= 0) {
305 enum AVCodecID codec_id =
306 s->audio_codec_id == AV_CODEC_ID_NONE ? DEFAULT_CODEC_ID : s->audio_codec_id;
307 int frame_size = ((av_get_bits_per_sample(codec_id) >> 3) * pd->channels);
308 int frame_duration = read_length / frame_size;
309
310
311 if (negative) {
312 dts += latency;
313 } else
314 dts -= latency;
315 if (pd->wallclock)
316 pkt->pts = ff_timefilter_update(pd->timefilter, dts, pd->last_period);
317
318 pd->last_period = frame_duration;
319 } else {
320 av_log(s, AV_LOG_WARNING, "pa_stream_get_latency() failed\n");
321 }
322
323 memcpy(pkt->data, read_data, read_length);
324 pa_stream_drop(pd->stream);
325
326 pa_threaded_mainloop_unlock(pd->mainloop);
327 return 0;
328
329 unlock_and_fail:
330 pa_threaded_mainloop_unlock(pd->mainloop);
331 return ret;
332 }
333
334 static int pulse_get_device_list(AVFormatContext *h, AVDeviceInfoList *device_list)
335 {
336 PulseData *s = h->priv_data;
337 return ff_pulse_audio_get_devices(device_list, s->server, 0);
338 }
339
340 #define OFFSET(a) offsetof(PulseData, a)
341 #define D AV_OPT_FLAG_DECODING_PARAM
342
343 static const AVOption options[] = {
344 { "server", "set PulseAudio server", OFFSET(server), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, D },
345 { "name", "set application name", OFFSET(name), AV_OPT_TYPE_STRING, {.str = LIBAVFORMAT_IDENT}, 0, 0, D },
346 { "stream_name", "set stream description", OFFSET(stream_name), AV_OPT_TYPE_STRING, {.str = "record"}, 0, 0, D },
347 { "sample_rate", "set sample rate in Hz", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 48000}, 1, INT_MAX, D },
348 { "channels", "set number of audio channels", OFFSET(channels), AV_OPT_TYPE_INT, {.i64 = 2}, 1, INT_MAX, D },
349 { "frame_size", "set number of bytes per frame", OFFSET(frame_size), AV_OPT_TYPE_INT, {.i64 = 1024}, 1, INT_MAX, D },
350 { "fragment_size", "set buffering size, affects latency and cpu usage", OFFSET(fragment_size), AV_OPT_TYPE_INT, {.i64 = -1}, -1, INT_MAX, D },
351 { "wallclock", "set the initial pts using the current time", OFFSET(wallclock), AV_OPT_TYPE_INT, {.i64 = 1}, -1, 1, D },
352 { NULL },
353 };
354
355 static const AVClass pulse_demuxer_class = {
356 .class_name = "Pulse demuxer",
357 .item_name = av_default_item_name,
358 .option = options,
359 .version = LIBAVUTIL_VERSION_INT,
360 .category = AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
361 };
362
363 AVInputFormat ff_pulse_demuxer = {
364 .name = "pulse",
365 .long_name = NULL_IF_CONFIG_SMALL("Pulse audio input"),
366 .priv_data_size = sizeof(PulseData),
367 .read_header = pulse_read_header,
368 .read_packet = pulse_read_packet,
369 .read_close = pulse_close,
370 .get_device_list = pulse_get_device_list,
371 .flags = AVFMT_NOFILE,
372 .priv_class = &pulse_demuxer_class,
373 };