blob: ccd731801244d026a07e86ab8a5b6db33b0f87ca
| 1 | /* |
| 2 | * This file is part of FFmpeg. |
| 3 | * |
| 4 | * FFmpeg is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 2.1 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * FFmpeg is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with FFmpeg; if not, write to the Free Software |
| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 17 | */ |
| 18 | |
| 19 | #include "internal.h" |
| 20 | #include "libavutil/opt.h" |
| 21 | #include "libavformat/avformat.h" |
| 22 | |
| 23 | int ff_alloc_input_device_context(AVFormatContext **avctx, AVInputFormat *iformat, const char *format) |
| 24 | { |
| 25 | AVFormatContext *s; |
| 26 | int ret = 0; |
| 27 | |
| 28 | *avctx = NULL; |
| 29 | if (!iformat && !format) |
| 30 | return AVERROR(EINVAL); |
| 31 | if (!(s = avformat_alloc_context())) |
| 32 | return AVERROR(ENOMEM); |
| 33 | |
| 34 | if (!iformat) |
| 35 | iformat = av_find_input_format(format); |
| 36 | if (!iformat || !iformat->priv_class || !AV_IS_INPUT_DEVICE(iformat->priv_class->category)) { |
| 37 | ret = AVERROR(EINVAL); |
| 38 | goto error; |
| 39 | } |
| 40 | s->iformat = iformat; |
| 41 | if (s->iformat->priv_data_size > 0) { |
| 42 | s->priv_data = av_mallocz(s->iformat->priv_data_size); |
| 43 | if (!s->priv_data) { |
| 44 | ret = AVERROR(ENOMEM); |
| 45 | goto error; |
| 46 | } |
| 47 | if (s->iformat->priv_class) { |
| 48 | *(const AVClass**)s->priv_data= s->iformat->priv_class; |
| 49 | av_opt_set_defaults(s->priv_data); |
| 50 | } |
| 51 | } else |
| 52 | s->priv_data = NULL; |
| 53 | |
| 54 | *avctx = s; |
| 55 | return 0; |
| 56 | error: |
| 57 | avformat_free_context(s); |
| 58 | return ret; |
| 59 | } |
| 60 |