60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/*
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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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