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ffmpeg/libavdevice/avdevice.c

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/*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/samplefmt.h"
#include "libavutil/pixfmt.h"
#include "libavcodec/avcodec.h"
#include "avdevice.h"
#include "internal.h"
#include "config.h"
#include "libavutil/ffversion.h"
const char av_device_ffversion[] = "FFmpeg version " FFMPEG_VERSION;
#define E AV_OPT_FLAG_ENCODING_PARAM
#define D AV_OPT_FLAG_DECODING_PARAM
#define A AV_OPT_FLAG_AUDIO_PARAM
#define V AV_OPT_FLAG_VIDEO_PARAM
#define OFFSET(x) offsetof(AVDeviceCapabilitiesQuery, x)
const AVOption av_device_capabilities[] = {
{ "codec", "codec", OFFSET(codec), AV_OPT_TYPE_INT,
{.i64 = AV_CODEC_ID_NONE}, AV_CODEC_ID_NONE, INT_MAX, E|D|A|V },
{ "sample_format", "sample format", OFFSET(sample_format), AV_OPT_TYPE_SAMPLE_FMT,
{.i64 = AV_SAMPLE_FMT_NONE}, AV_SAMPLE_FMT_NONE, INT_MAX, E|D|A },
{ "sample_rate", "sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT,
{.i64 = -1}, -1, INT_MAX, E|D|A },
{ "channels", "channels", OFFSET(channels), AV_OPT_TYPE_INT,
{.i64 = -1}, -1, INT_MAX, E|D|A },
{ "channel_layout", "channel layout", OFFSET(channel_layout), AV_OPT_TYPE_CHANNEL_LAYOUT,
{.i64 = -1}, -1, INT_MAX, E|D|A },
{ "pixel_format", "pixel format", OFFSET(pixel_format), AV_OPT_TYPE_PIXEL_FMT,
{.i64 = AV_PIX_FMT_NONE}, AV_PIX_FMT_NONE, INT_MAX, E|D|V },
{ "window_size", "window size", OFFSET(window_width), AV_OPT_TYPE_IMAGE_SIZE,
{.str = NULL}, -1, INT_MAX, E|D|V },
{ "frame_size", "frame size", OFFSET(frame_width), AV_OPT_TYPE_IMAGE_SIZE,
{.str = NULL}, -1, INT_MAX, E|D|V },
{ "fps", "fps", OFFSET(fps), AV_OPT_TYPE_RATIONAL,
{.dbl = -1}, -1, INT_MAX, E|D|V },
{ NULL }
};
#undef E
#undef D
#undef A
#undef V
#undef OFFSET
unsigned avdevice_version(void)
{
av_assert0(LIBAVDEVICE_VERSION_MICRO >= 100);
return LIBAVDEVICE_VERSION_INT;
}
const char * avdevice_configuration(void)
{
return FFMPEG_CONFIGURATION;
}
const char * avdevice_license(void)
{
#define LICENSE_PREFIX "libavdevice license: "
return &LICENSE_PREFIX FFMPEG_LICENSE[sizeof(LICENSE_PREFIX) - 1];
}
static void *device_next(void *prev, int output,
AVClassCategory c1, AVClassCategory c2)
{
const AVClass *pc;
AVClassCategory category = AV_CLASS_CATEGORY_NA;
do {
if (output) {
if (!(prev = av_oformat_next(prev)))
break;
pc = ((AVOutputFormat *)prev)->priv_class;
} else {
if (!(prev = av_iformat_next(prev)))
break;
pc = ((AVInputFormat *)prev)->priv_class;
}
if (!pc)
continue;
category = pc->category;
} while (category != c1 && category != c2);
return prev;
}
AVInputFormat *av_input_audio_device_next(AVInputFormat *d)
{
return device_next(d, 0, AV_CLASS_CATEGORY_DEVICE_AUDIO_INPUT,
AV_CLASS_CATEGORY_DEVICE_INPUT);
}
AVInputFormat *av_input_video_device_next(AVInputFormat *d)
{
return device_next(d, 0, AV_CLASS_CATEGORY_DEVICE_VIDEO_INPUT,
AV_CLASS_CATEGORY_DEVICE_INPUT);
}
AVOutputFormat *av_output_audio_device_next(AVOutputFormat *d)
{
return device_next(d, 1, AV_CLASS_CATEGORY_DEVICE_AUDIO_OUTPUT,
AV_CLASS_CATEGORY_DEVICE_OUTPUT);
}
AVOutputFormat *av_output_video_device_next(AVOutputFormat *d)
{
return device_next(d, 1, AV_CLASS_CATEGORY_DEVICE_VIDEO_OUTPUT,
AV_CLASS_CATEGORY_DEVICE_OUTPUT);
}
int avdevice_app_to_dev_control_message(struct AVFormatContext *s, enum AVAppToDevMessageType type,
void *data, size_t data_size)
{
if (!s->oformat || !s->oformat->control_message)
return AVERROR(ENOSYS);
return s->oformat->control_message(s, type, data, data_size);
}
int avdevice_dev_to_app_control_message(struct AVFormatContext *s, enum AVDevToAppMessageType type,
void *data, size_t data_size)
{
if (!s->control_message_cb)
return AVERROR(ENOSYS);
return s->control_message_cb(s, type, data, data_size);
}
int avdevice_capabilities_create(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s,
AVDictionary **device_options)
{
int ret;
av_assert0(s && caps);
av_assert0(s->iformat || s->oformat);
if ((s->oformat && !s->oformat->create_device_capabilities) ||
(s->iformat && !s->iformat->create_device_capabilities))
return AVERROR(ENOSYS);
*caps = av_mallocz(sizeof(**caps));
if (!(*caps))
return AVERROR(ENOMEM);
(*caps)->device_context = s;
if (((ret = av_opt_set_dict(s->priv_data, device_options)) < 0))
goto fail;
if (s->iformat) {
if ((ret = s->iformat->create_device_capabilities(s, *caps)) < 0)
goto fail;
} else {
if ((ret = s->oformat->create_device_capabilities(s, *caps)) < 0)
goto fail;
}
av_opt_set_defaults(*caps);
return 0;
fail:
av_freep(caps);
return ret;
}
void avdevice_capabilities_free(AVDeviceCapabilitiesQuery **caps, AVFormatContext *s)
{
if (!s || !caps || !(*caps))
return;
av_assert0(s->iformat || s->oformat);
if (s->iformat) {
if (s->iformat->free_device_capabilities)
s->iformat->free_device_capabilities(s, *caps);
} else {
if (s->oformat->free_device_capabilities)
s->oformat->free_device_capabilities(s, *caps);
}
av_freep(caps);
}
int avdevice_list_devices(AVFormatContext *s, AVDeviceInfoList **device_list)
{
int ret;
av_assert0(s);
av_assert0(device_list);
av_assert0(s->oformat || s->iformat);
if ((s->oformat && !s->oformat->get_device_list) ||
(s->iformat && !s->iformat->get_device_list)) {
*device_list = NULL;
return AVERROR(ENOSYS);
}
*device_list = av_mallocz(sizeof(AVDeviceInfoList));
if (!(*device_list))
return AVERROR(ENOMEM);
/* no default device by default */
(*device_list)->default_device = -1;
if (s->oformat)
ret = s->oformat->get_device_list(s, *device_list);
else
ret = s->iformat->get_device_list(s, *device_list);
if (ret < 0)
avdevice_free_list_devices(device_list);
return ret;
}
static int list_devices_for_context(AVFormatContext *s, AVDictionary *options,
AVDeviceInfoList **device_list)
{
AVDictionary *tmp = NULL;
int ret;
av_dict_copy(&tmp, options, 0);
if ((ret = av_opt_set_dict2(s, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
goto fail;
ret = avdevice_list_devices(s, device_list);
fail:
av_dict_free(&tmp);
avformat_free_context(s);
return ret;
}
int avdevice_list_input_sources(AVInputFormat *device, const char *device_name,
AVDictionary *device_options, AVDeviceInfoList **device_list)
{
AVFormatContext *s = NULL;
int ret;
if ((ret = ff_alloc_input_device_context(&s, device, device_name)) < 0)
return ret;
return list_devices_for_context(s, device_options, device_list);
}
int avdevice_list_output_sinks(AVOutputFormat *device, const char *device_name,
AVDictionary *device_options, AVDeviceInfoList **device_list)
{
AVFormatContext *s = NULL;
int ret;
if ((ret = avformat_alloc_output_context2(&s, device, device_name, NULL)) < 0)
return ret;
return list_devices_for_context(s, device_options, device_list);
}
void avdevice_free_list_devices(AVDeviceInfoList **device_list)
{
AVDeviceInfoList *list;
AVDeviceInfo *dev;
int i;
av_assert0(device_list);
list = *device_list;
if (!list)
return;
for (i = 0; i < list->nb_devices; i++) {
dev = list->devices[i];
if (dev) {
av_freep(&dev->device_name);
av_freep(&dev->device_description);
av_free(dev);
}
}
av_freep(&list->devices);
av_freep(device_list);
}
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