/*
* 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 "internal.h"
#include "libavutil/opt.h"
#include "libavformat/avformat.h"
int ff_alloc_input_device_context(AVFormatContext **avctx, AVInputFormat *iformat, const char *format)
{
AVFormatContext *s;
int ret = 0;
*avctx = NULL;
if (!iformat && !format)
return AVERROR(EINVAL);
if (!(s = avformat_alloc_context()))
return AVERROR(ENOMEM);
if (!iformat)
iformat = av_find_input_format(format);
if (!iformat || !iformat->priv_class || !AV_IS_INPUT_DEVICE(iformat->priv_class->category)) {
ret = AVERROR(EINVAL);
goto error;
}
s->iformat = iformat;
if (s->iformat->priv_data_size > 0) {
s->priv_data = av_mallocz(s->iformat->priv_data_size);
if (!s->priv_data) {
ret = AVERROR(ENOMEM);
goto error;
}
if (s->iformat->priv_class) {
*(const AVClass**)s->priv_data= s->iformat->priv_class;
av_opt_set_defaults(s->priv_data);
}
} else
s->priv_data = NULL;
*avctx = s;
return 0;
error:
avformat_free_context(s);
return ret;
}