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https://github.com/FFmpeg/FFmpeg.git
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lavd/avdevice: introduce helper functions for sink/sources listing
Signed-off-by: Lukasz Marek <lukasz.m.luki2@gmail.com>
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@ -15,6 +15,10 @@ libavutil: 2014-08-09
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API changes, most recent first:
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2015-01-11 - xxxxxxx - lavd 56.4.100 - avdevice.h
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Add avdevice_list_input_sources().
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Add avdevice_list_output_sinks().
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201x-xx-xx - xxxxxxx - lavc 56.10.0 - vdpau.h
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Add av_vdpau_get_surface_parameters().
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@ -7,6 +7,7 @@ HEADERS = avdevice.h \
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OBJS = alldevices.o \
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avdevice.o \
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utils.o \
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# input/output devices
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OBJS-$(CONFIG_ALSA_INDEV) += alsa-audio-common.o \
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@ -21,6 +21,7 @@
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#include "libavutil/pixfmt.h"
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#include "libavcodec/avcodec.h"
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#include "avdevice.h"
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#include "internal.h"
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#include "config.h"
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#include "libavutil/ffversion.h"
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@ -208,6 +209,44 @@ int avdevice_list_devices(AVFormatContext *s, AVDeviceInfoList **device_list)
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return ret;
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}
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static int list_devices_for_context(AVFormatContext *s, AVDictionary *options,
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AVDeviceInfoList **device_list)
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{
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AVDictionary *tmp = NULL;
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int ret;
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av_dict_copy(&tmp, options, 0);
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if ((ret = av_opt_set_dict2(s, &tmp, AV_OPT_SEARCH_CHILDREN)) < 0)
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goto fail;
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ret = avdevice_list_devices(s, device_list);
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fail:
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av_dict_free(&tmp);
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avformat_free_context(s);
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return ret;
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}
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int avdevice_list_input_sources(AVInputFormat *device, const char *device_name,
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AVDictionary *device_options, AVDeviceInfoList **device_list)
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{
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AVFormatContext *s = NULL;
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int ret;
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if ((ret = ff_alloc_input_device_context(&s, device, device_name)) < 0)
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return ret;
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return list_devices_for_context(s, device_options, device_list);
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}
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int avdevice_list_output_sinks(AVOutputFormat *device, const char *device_name,
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AVDictionary *device_options, AVDeviceInfoList **device_list)
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{
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AVFormatContext *s = NULL;
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int ret;
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if ((ret = avformat_alloc_output_context2(&s, device, device_name, NULL)) < 0)
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return ret;
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return list_devices_for_context(s, device_options, device_list);
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}
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void avdevice_free_list_devices(AVDeviceInfoList **device_list)
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{
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AVDeviceInfoList *list;
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@ -484,4 +484,26 @@ int avdevice_list_devices(struct AVFormatContext *s, AVDeviceInfoList **device_l
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*/
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void avdevice_free_list_devices(AVDeviceInfoList **device_list);
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/**
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* List devices.
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*
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* Returns available device names and their parameters.
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* These are convinient wrappers for avdevice_list_devices().
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* Device context is allocated and deallocated internally.
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*
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* @param device device format. May be NULL if device name is set.
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* @param device_name device name. May be NULL if device format is set.
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* @param device_options An AVDictionary filled with device-private options. May be NULL.
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* The same options must be passed later to avformat_write_header() for output
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* devices or avformat_open_input() for input devices, or at any other place
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* that affects device-private options.
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* @param[out] device_list list of autodetected devices
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* @return count of autodetected devices, negative on error.
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* @note device argument takes precedence over device_name when both are set.
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*/
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int avdevice_list_input_sources(struct AVInputFormat *device, const char *device_name,
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AVDictionary *device_options, AVDeviceInfoList **device_list);
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int avdevice_list_output_sinks(struct AVOutputFormat *device, const char *device_name,
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AVDictionary *device_options, AVDeviceInfoList **device_list);
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#endif /* AVDEVICE_AVDEVICE_H */
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27
libavdevice/internal.h
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27
libavdevice/internal.h
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@ -0,0 +1,27 @@
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVDEVICE_INTERNAL_H
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#define AVDEVICE_INTERNAL_H
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#include "libavformat/avformat.h"
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int ff_alloc_input_device_context(struct AVFormatContext **avctx, struct AVInputFormat *iformat,
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const char *format);
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#endif
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59
libavdevice/utils.c
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59
libavdevice/utils.c
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@ -0,0 +1,59 @@
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/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "internal.h"
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#include "libavutil/opt.h"
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#include "libavformat/avformat.h"
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int ff_alloc_input_device_context(AVFormatContext **avctx, AVInputFormat *iformat, const char *format)
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{
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AVFormatContext *s;
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int ret = 0;
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*avctx = NULL;
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if (!iformat && !format)
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return AVERROR(EINVAL);
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if (!(s = avformat_alloc_context()))
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return AVERROR(ENOMEM);
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if (!iformat)
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iformat = av_find_input_format(format);
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if (!iformat || !iformat->priv_class || !AV_IS_INPUT_DEVICE(iformat->priv_class->category)) {
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ret = AVERROR(EINVAL);
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goto error;
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}
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s->iformat = iformat;
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if (s->iformat->priv_data_size > 0) {
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s->priv_data = av_mallocz(s->iformat->priv_data_size);
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if (!s->priv_data) {
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ret = AVERROR(ENOMEM);
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goto error;
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}
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if (s->iformat->priv_class) {
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*(const AVClass**)s->priv_data= s->iformat->priv_class;
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av_opt_set_defaults(s->priv_data);
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}
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} else
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s->priv_data = NULL;
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*avctx = s;
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return 0;
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error:
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avformat_free_context(s);
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return ret;
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}
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@ -28,7 +28,7 @@
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#include "libavutil/version.h"
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#define LIBAVDEVICE_VERSION_MAJOR 56
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#define LIBAVDEVICE_VERSION_MINOR 3
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#define LIBAVDEVICE_VERSION_MINOR 4
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#define LIBAVDEVICE_VERSION_MICRO 100
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#define LIBAVDEVICE_VERSION_INT AV_VERSION_INT(LIBAVDEVICE_VERSION_MAJOR, \
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