diff options
Diffstat (limited to 'libavdevice/utils.c')
-rw-r--r-- | libavdevice/utils.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/libavdevice/utils.c b/libavdevice/utils.c new file mode 100644 index 0000000..ccd7318 --- /dev/null +++ b/libavdevice/utils.c @@ -0,0 +1,59 @@ +/* + * 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; +} |