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 "avdevice.h"
21 #include "internal.h"
22
23 #if FF_API_DEVICE_CAPABILITIES
24 const AVOption av_device_capabilities[] = {
25 { NULL }
26 };
27 #endif
28
avdevice_app_to_dev_control_message(struct AVFormatContext * s,enum AVAppToDevMessageType type,void * data,size_t data_size)29 int avdevice_app_to_dev_control_message(struct AVFormatContext *s, enum AVAppToDevMessageType type,
30 void *data, size_t data_size)
31 {
32 if (!s->oformat || !s->oformat->control_message)
33 return AVERROR(ENOSYS);
34 return s->oformat->control_message(s, type, data, data_size);
35 }
36
avdevice_dev_to_app_control_message(struct AVFormatContext * s,enum AVDevToAppMessageType type,void * data,size_t data_size)37 int avdevice_dev_to_app_control_message(struct AVFormatContext *s, enum AVDevToAppMessageType type,
38 void *data, size_t data_size)
39 {
40 if (!s->control_message_cb)
41 return AVERROR(ENOSYS);
42 return s->control_message_cb(s, type, data, data_size);
43 }
44
45 #if FF_API_DEVICE_CAPABILITIES
avdevice_capabilities_create(AVDeviceCapabilitiesQuery ** caps,AVFormatContext * s,AVDictionary ** device_options)46 int avdevice_capabilities_create(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s,
47 AVDictionary **device_options)
48 {
49 return AVERROR(ENOSYS);
50 }
51
avdevice_capabilities_free(AVDeviceCapabilitiesQuery ** caps,AVFormatContext * s)52 void avdevice_capabilities_free(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s)
53 {
54 return;
55 }
56 #endif
57
avdevice_list_devices(AVFormatContext * s,AVDeviceInfoList ** device_list)58 int avdevice_list_devices(AVFormatContext *s, AVDeviceInfoList **device_list)
59 {
60 int ret;
61 av_assert0(s);
62 av_assert0(device_list);
63 av_assert0(s->oformat || s->iformat);
64 if ((s->oformat && !s->oformat->get_device_list) ||
65 (s->iformat && !s->iformat->get_device_list)) {
66 *device_list = NULL;
67 return AVERROR(ENOSYS);
68 }
69 *device_list = av_mallocz(sizeof(AVDeviceInfoList));
70 if (!(*device_list))
71 return AVERROR(ENOMEM);
72 /* no default device by default */
73 (*device_list)->default_device = -1;
74 if (s->oformat)
75 ret = s->oformat->get_device_list(s, *device_list);
76 else
77 ret = s->iformat->get_device_list(s, *device_list);
78 if (ret < 0) {
79 avdevice_free_list_devices(device_list);
80 return ret;
81 }
82 return (*device_list)->nb_devices;
83 }
84
list_devices_for_context(AVFormatContext * s,AVDictionary * options,AVDeviceInfoList ** device_list)85 static int list_devices_for_context(AVFormatContext *s, AVDictionary *options,
86 AVDeviceInfoList **device_list)
87 {
88 AVDictionary *tmp = NULL;
89 int ret;
90
91 av_dict_copy(&tmp, options, 0);
92 if ((ret = av_opt_set_dict2(s, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
93 goto fail;
94 ret = avdevice_list_devices(s, device_list);
95 fail:
96 av_dict_free(&tmp);
97 avformat_free_context(s);
98 return ret;
99 }
100
avdevice_list_input_sources(const AVInputFormat * device,const char * device_name,AVDictionary * device_options,AVDeviceInfoList ** device_list)101 int avdevice_list_input_sources(const AVInputFormat *device, const char *device_name,
102 AVDictionary *device_options, AVDeviceInfoList **device_list)
103 {
104 AVFormatContext *s = NULL;
105 int ret;
106
107 if ((ret = ff_alloc_input_device_context(&s, device, device_name)) < 0)
108 return ret;
109 return list_devices_for_context(s, device_options, device_list);
110 }
111
avdevice_list_output_sinks(const AVOutputFormat * device,const char * device_name,AVDictionary * device_options,AVDeviceInfoList ** device_list)112 int avdevice_list_output_sinks(const AVOutputFormat *device, const char *device_name,
113 AVDictionary *device_options, AVDeviceInfoList **device_list)
114 {
115 AVFormatContext *s = NULL;
116 int ret;
117
118 if ((ret = avformat_alloc_output_context2(&s, device, device_name, NULL)) < 0)
119 return ret;
120 return list_devices_for_context(s, device_options, device_list);
121 }
122
avdevice_free_list_devices(AVDeviceInfoList ** device_list)123 void avdevice_free_list_devices(AVDeviceInfoList **device_list)
124 {
125 AVDeviceInfoList *list;
126 AVDeviceInfo *dev;
127 int i;
128
129 av_assert0(device_list);
130 list = *device_list;
131 if (!list)
132 return;
133
134 for (i = 0; i < list->nb_devices; i++) {
135 dev = list->devices[i];
136 if (dev) {
137 av_freep(&dev->device_name);
138 av_freep(&dev->device_description);
139 av_freep(&dev->media_types);
140 av_free(dev);
141 }
142 }
143 av_freep(&list->devices);
144 av_freep(device_list);
145 }
146