| /* |
| * 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; |
| } |