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avdevice.c
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1 /*
2  * This file is part of FFmpeg.
3  *
4  * FFmpeg is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * FFmpeg is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with FFmpeg; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17  */
18 
19 #include "libavutil/avassert.h"
20 #include "libavutil/samplefmt.h"
21 #include "libavutil/pixfmt.h"
22 #include "libavcodec/avcodec.h"
23 #include "avdevice.h"
24 #include "internal.h"
25 #include "config.h"
26 
27 #include "libavutil/ffversion.h"
28 const char av_device_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
29 
30 #define E AV_OPT_FLAG_ENCODING_PARAM
31 #define D AV_OPT_FLAG_DECODING_PARAM
32 #define A AV_OPT_FLAG_AUDIO_PARAM
33 #define V AV_OPT_FLAG_VIDEO_PARAM
34 #define OFFSET(x) offsetof(AVDeviceCapabilitiesQuery, x)
35 
37  { "codec", "codec", OFFSET(codec), AV_OPT_TYPE_INT,
38  {.i64 = AV_CODEC_ID_NONE}, AV_CODEC_ID_NONE, INT_MAX, E|D|A|V },
39  { "sample_format", "sample format", OFFSET(sample_format), AV_OPT_TYPE_SAMPLE_FMT,
40  {.i64 = AV_SAMPLE_FMT_NONE}, AV_SAMPLE_FMT_NONE, INT_MAX, E|D|A },
41  { "sample_rate", "sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT,
42  {.i64 = -1}, -1, INT_MAX, E|D|A },
43  { "channels", "channels", OFFSET(channels), AV_OPT_TYPE_INT,
44  {.i64 = -1}, -1, INT_MAX, E|D|A },
45  { "channel_layout", "channel layout", OFFSET(channel_layout), AV_OPT_TYPE_CHANNEL_LAYOUT,
46  {.i64 = -1}, -1, INT_MAX, E|D|A },
47  { "pixel_format", "pixel format", OFFSET(pixel_format), AV_OPT_TYPE_PIXEL_FMT,
48  {.i64 = AV_PIX_FMT_NONE}, AV_PIX_FMT_NONE, INT_MAX, E|D|V },
49  { "window_size", "window size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,
50  {.str = NULL}, -1, INT_MAX, E|D|V },
51  { "frame_size", "frame size", OFFSET(frame_width), AV_OPT_TYPE_IMAGE_SIZE,
52  {.str = NULL}, -1, INT_MAX, E|D|V },
53  { "fps", "fps", OFFSET(fps), AV_OPT_TYPE_RATIONAL,
54  {.dbl = -1}, -1, INT_MAX, E|D|V },
55  { NULL }
56 };
57 
58 #undef E
59 #undef D
60 #undef A
61 #undef V
62 #undef OFFSET
63 
64 unsigned avdevice_version(void)
65 {
68 }
69 
70 const char * avdevice_configuration(void)
71 {
72  return FFMPEG_CONFIGURATION;
73 }
74 
75 const char * avdevice_license(void)
76 {
77 #define LICENSE_PREFIX "libavdevice license: "
78  return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
79 }
80 
81 static void *device_next(void *prev, int output,
83 {
84  const AVClass *pc;
86  do {
87  if (output) {
88  if (!(prev = av_oformat_next(prev)))
89  break;
90  pc = ((AVOutputFormat *)prev)->priv_class;
91  } else {
92  if (!(prev = av_iformat_next(prev)))
93  break;
94  pc = ((AVInputFormat *)prev)->priv_class;
95  }
96  if (!pc)
97  continue;
98  category = pc->category;
99  } while (category != c1 && category != c2);
100  return prev;
101 }
102 
104 {
107 }
108 
110 {
113 }
114 
116 {
119 }
120 
122 {
125 }
126 
128  void *data, size_t data_size)
129 {
130  if (!s->oformat || !s->oformat->control_message)
131  return AVERROR(ENOSYS);
132  return s->oformat->control_message(s, type, data, data_size);
133 }
134 
136  void *data, size_t data_size)
137 {
139  return AVERROR(ENOSYS);
140  return av_format_get_control_message_cb(s)(s, type, data, data_size);
141 }
142 
144  AVDictionary **device_options)
145 {
146  int ret;
147  av_assert0(s && caps);
148  av_assert0(s->iformat || s->oformat);
149  if ((s->oformat && !s->oformat->create_device_capabilities) ||
151  return AVERROR(ENOSYS);
152  *caps = av_mallocz(sizeof(**caps));
153  if (!(*caps))
154  return AVERROR(ENOMEM);
155  (*caps)->device_context = s;
156  if (((ret = av_opt_set_dict(s->priv_data, device_options)) < 0))
157  goto fail;
158  if (s->iformat) {
159  if ((ret = s->iformat->create_device_capabilities(s, *caps)) < 0)
160  goto fail;
161  } else {
162  if ((ret = s->oformat->create_device_capabilities(s, *caps)) < 0)
163  goto fail;
164  }
165  av_opt_set_defaults(*caps);
166  return 0;
167  fail:
168  av_freep(caps);
169  return ret;
170 }
171 
173 {
174  if (!s || !caps || !(*caps))
175  return;
176  av_assert0(s->iformat || s->oformat);
177  if (s->iformat) {
179  s->iformat->free_device_capabilities(s, *caps);
180  } else {
182  s->oformat->free_device_capabilities(s, *caps);
183  }
184  av_freep(caps);
185 }
186 
188 {
189  int ret;
190  av_assert0(s);
191  av_assert0(device_list);
192  av_assert0(s->oformat || s->iformat);
193  if ((s->oformat && !s->oformat->get_device_list) ||
194  (s->iformat && !s->iformat->get_device_list)) {
195  *device_list = NULL;
196  return AVERROR(ENOSYS);
197  }
198  *device_list = av_mallocz(sizeof(AVDeviceInfoList));
199  if (!(*device_list))
200  return AVERROR(ENOMEM);
201  /* no default device by default */
202  (*device_list)->default_device = -1;
203  if (s->oformat)
204  ret = s->oformat->get_device_list(s, *device_list);
205  else
206  ret = s->iformat->get_device_list(s, *device_list);
207  if (ret < 0)
208  avdevice_free_list_devices(device_list);
209  return ret;
210 }
211 
213  AVDeviceInfoList **device_list)
214 {
215  AVDictionary *tmp = NULL;
216  int ret;
217 
218  av_dict_copy(&tmp, options, 0);
219  if ((ret = av_opt_set_dict2(s, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
220  goto fail;
221  ret = avdevice_list_devices(s, device_list);
222  fail:
223  av_dict_free(&tmp);
225  return ret;
226 }
227 
228 int avdevice_list_input_sources(AVInputFormat *device, const char *device_name,
229  AVDictionary *device_options, AVDeviceInfoList **device_list)
230 {
231  AVFormatContext *s = NULL;
232  int ret;
233 
234  if ((ret = ff_alloc_input_device_context(&s, device, device_name)) < 0)
235  return ret;
236  return list_devices_for_context(s, device_options, device_list);
237 }
238 
239 int avdevice_list_output_sinks(AVOutputFormat *device, const char *device_name,
240  AVDictionary *device_options, AVDeviceInfoList **device_list)
241 {
242  AVFormatContext *s = NULL;
243  int ret;
244 
245  if ((ret = avformat_alloc_output_context2(&s, device, device_name, NULL)) < 0)
246  return ret;
247  return list_devices_for_context(s, device_options, device_list);
248 }
249 
251 {
252  AVDeviceInfoList *list;
253  AVDeviceInfo *dev;
254  int i;
255 
256  av_assert0(device_list);
257  list = *device_list;
258  if (!list)
259  return;
260 
261  for (i = 0; i < list->nb_devices; i++) {
262  dev = list->devices[i];
263  if (dev) {
264  av_freep(&dev->device_name);
266  av_free(dev);
267  }
268  }
269  av_freep(&list->devices);
270  av_freep(device_list);
271 }