mirror of https://github.com/mpv-player/mpv
104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <assert.h>
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#include <libavutil/common.h>
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#include "core/mp_talloc.h"
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#include "av_common.h"
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#include "codecs.h"
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// Copy the codec-related fields from st into avctx. This does not set the
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// codec itself, only codec related header data provided by libavformat.
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// The goal is to initialize a new decoder with the header data provided by
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// libavformat, and unlike avcodec_copy_context(), allow the user to create
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// a clean AVCodecContext for a manually selected AVCodec.
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// This is strictly for decoding only.
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void mp_copy_lav_codec_headers(AVCodecContext *avctx, AVCodecContext *st)
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{
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if (st->extradata_size) {
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av_free(avctx->extradata);
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avctx->extradata_size = 0;
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avctx->extradata =
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av_mallocz(st->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (avctx->extradata) {
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avctx->extradata_size = st->extradata_size;
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memcpy(avctx->extradata, st->extradata, st->extradata_size);
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}
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}
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avctx->codec_tag = st->codec_tag;
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avctx->stream_codec_tag = st->stream_codec_tag;
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avctx->bit_rate = st->bit_rate;
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avctx->width = st->width;
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avctx->height = st->height;
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avctx->pix_fmt = st->pix_fmt;
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avctx->sample_aspect_ratio = st->sample_aspect_ratio;
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avctx->chroma_sample_location = st->chroma_sample_location;
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avctx->sample_rate = st->sample_rate;
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avctx->channels = st->channels;
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avctx->block_align = st->block_align;
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avctx->channel_layout = st->channel_layout;
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avctx->audio_service_type = st->audio_service_type;
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avctx->bits_per_coded_sample = st->bits_per_coded_sample;
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}
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void mp_add_lavc_decoders(struct mp_decoder_list *list, enum AVMediaType type)
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{
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AVCodec *cur = NULL;
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for (;;) {
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cur = av_codec_next(cur);
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if (!cur)
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break;
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if (av_codec_is_decoder(cur) && cur->type == type) {
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mp_add_decoder(list, "lavc", mp_codec_from_av_codec_id(cur->id),
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cur->name, cur->long_name);
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}
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}
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}
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int mp_codec_to_av_codec_id(const char *codec)
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{
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int id = AV_CODEC_ID_NONE;
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if (codec) {
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const AVCodecDescriptor *desc = avcodec_descriptor_get_by_name(codec);
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if (desc)
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id = desc->id;
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if (id == AV_CODEC_ID_NONE) {
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AVCodec *avcodec = avcodec_find_decoder_by_name(codec);
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if (avcodec)
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id = avcodec->id;
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}
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}
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return id;
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}
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const char *mp_codec_from_av_codec_id(int codec_id)
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{
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const char *name = NULL;
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const AVCodecDescriptor *desc = avcodec_descriptor_get(codec_id);
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if (desc)
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name = desc->name;
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if (!name) {
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AVCodec *avcodec = avcodec_find_decoder(codec_id);
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if (avcodec)
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name = avcodec->name;
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}
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return name;
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}
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