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FFmpeg/libavcodec/codec_par.c
Niklas Haas ecebf9c693 avcodec/avcodec: add AVCodecContext.alpha_mode 
Following in the footsteps of the previous commit, this commit adds the
new fields to AVCodecContext so we can start properly setting it on codecs,
as well as limiting the list of supported options to detect a format mismatch
during encode.

This commit also sets up the necessary infrastructure to start using the
newly added field in all codecs.
2025-09-02 17:06:24 +02:00

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/*
* AVCodecParameters functions for libavcodec
*
* 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
*/
/**
* @file
* AVCodecParameters functions for libavcodec.
*/
#include <string.h>
#include "libavutil/mem.h"
#include "avcodec.h"
#include "codec_par.h"
#include "packet.h"
static void codec_parameters_reset(AVCodecParameters *par)
{
av_freep(&par->extradata);
av_channel_layout_uninit(&par->ch_layout);
av_packet_side_data_free(&par->coded_side_data, &par->nb_coded_side_data);
memset(par, 0, sizeof(*par));
par->codec_type = AVMEDIA_TYPE_UNKNOWN;
par->codec_id = AV_CODEC_ID_NONE;
par->format = -1;
par->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
par->field_order = AV_FIELD_UNKNOWN;
par->color_range = AVCOL_RANGE_UNSPECIFIED;
par->color_primaries = AVCOL_PRI_UNSPECIFIED;
par->color_trc = AVCOL_TRC_UNSPECIFIED;
par->color_space = AVCOL_SPC_UNSPECIFIED;
par->chroma_location = AVCHROMA_LOC_UNSPECIFIED;
par->sample_aspect_ratio = (AVRational){ 0, 1 };
par->framerate = (AVRational){ 0, 1 };
par->profile = AV_PROFILE_UNKNOWN;
par->level = AV_LEVEL_UNKNOWN;
par->alpha_mode = AVALPHA_MODE_UNSPECIFIED;
}
AVCodecParameters *avcodec_parameters_alloc(void)
{
AVCodecParameters *par = av_mallocz(sizeof(*par));
if (!par)
return NULL;
codec_parameters_reset(par);
return par;
}
void avcodec_parameters_free(AVCodecParameters **ppar)
{
AVCodecParameters *par = *ppar;
if (!par)
return;
codec_parameters_reset(par);
av_freep(ppar);
}
static int codec_parameters_copy_side_data(AVPacketSideData **pdst, int *pnb_dst,
const AVPacketSideData *src, int nb_src)
{
AVPacketSideData *dst;
int nb_dst = *pnb_dst;
if (!src)
return 0;
*pdst = dst = av_calloc(nb_src, sizeof(*dst));
if (!dst)
return AVERROR(ENOMEM);
for (int i = 0; i < nb_src; i++) {
const AVPacketSideData *src_sd = &src[i];
AVPacketSideData *dst_sd = &dst[i];
dst_sd->data = av_memdup(src_sd->data, src_sd->size);
if (!dst_sd->data)
return AVERROR(ENOMEM);
dst_sd->type = src_sd->type;
dst_sd->size = src_sd->size;
*pnb_dst = ++nb_dst;
}
return 0;
}
int avcodec_parameters_copy(AVCodecParameters *dst, const AVCodecParameters *src)
{
int ret;
codec_parameters_reset(dst);
memcpy(dst, src, sizeof(*dst));
dst->ch_layout = (AVChannelLayout){0};
dst->extradata = NULL;
dst->extradata_size = 0;
dst->coded_side_data = NULL;
dst->nb_coded_side_data = 0;
if (src->extradata) {
dst->extradata = av_mallocz(src->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!dst->extradata)
return AVERROR(ENOMEM);
memcpy(dst->extradata, src->extradata, src->extradata_size);
dst->extradata_size = src->extradata_size;
}
ret = codec_parameters_copy_side_data(&dst->coded_side_data, &dst->nb_coded_side_data,
src->coded_side_data, src->nb_coded_side_data);
if (ret < 0)
return ret;
ret = av_channel_layout_copy(&dst->ch_layout, &src->ch_layout);
if (ret < 0)
return ret;
return 0;
}
int avcodec_parameters_from_context(AVCodecParameters *par,
const AVCodecContext *codec)
{
int ret;
codec_parameters_reset(par);
par->codec_type = codec->codec_type;
par->codec_id = codec->codec_id;
par->codec_tag = codec->codec_tag;
par->bit_rate = codec->bit_rate;
par->bits_per_coded_sample = codec->bits_per_coded_sample;
par->bits_per_raw_sample = codec->bits_per_raw_sample;
par->profile = codec->profile;
par->level = codec->level;
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
par->format = codec->pix_fmt;
par->width = codec->width;
par->height = codec->height;
par->field_order = codec->field_order;
par->color_range = codec->color_range;
par->color_primaries = codec->color_primaries;
par->color_trc = codec->color_trc;
par->color_space = codec->colorspace;
par->chroma_location = codec->chroma_sample_location;
par->sample_aspect_ratio = codec->sample_aspect_ratio;
par->video_delay = codec->has_b_frames;
par->framerate = codec->framerate;
par->alpha_mode = codec->alpha_mode;
break;
case AVMEDIA_TYPE_AUDIO:
par->format = codec->sample_fmt;
ret = av_channel_layout_copy(&par->ch_layout, &codec->ch_layout);
if (ret < 0)
return ret;
par->sample_rate = codec->sample_rate;
par->block_align = codec->block_align;
par->frame_size = codec->frame_size;
par->initial_padding = codec->initial_padding;
par->trailing_padding = codec->trailing_padding;
par->seek_preroll = codec->seek_preroll;
break;
case AVMEDIA_TYPE_SUBTITLE:
par->width = codec->width;
par->height = codec->height;
break;
}
if (codec->extradata) {
par->extradata = av_mallocz(codec->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!par->extradata)
return AVERROR(ENOMEM);
memcpy(par->extradata, codec->extradata, codec->extradata_size);
par->extradata_size = codec->extradata_size;
}
ret = codec_parameters_copy_side_data(&par->coded_side_data, &par->nb_coded_side_data,
codec->coded_side_data, codec->nb_coded_side_data);
if (ret < 0)
return ret;
return 0;
}
int avcodec_parameters_to_context(AVCodecContext *codec,
const AVCodecParameters *par)
{
int ret;
codec->codec_type = par->codec_type;
codec->codec_id = par->codec_id;
codec->codec_tag = par->codec_tag;
codec->bit_rate = par->bit_rate;
codec->bits_per_coded_sample = par->bits_per_coded_sample;
codec->bits_per_raw_sample = par->bits_per_raw_sample;
codec->profile = par->profile;
codec->level = par->level;
switch (par->codec_type) {
case AVMEDIA_TYPE_VIDEO:
codec->pix_fmt = par->format;
codec->width = par->width;
codec->height = par->height;
codec->field_order = par->field_order;
codec->color_range = par->color_range;
codec->color_primaries = par->color_primaries;
codec->color_trc = par->color_trc;
codec->colorspace = par->color_space;
codec->chroma_sample_location = par->chroma_location;
codec->sample_aspect_ratio = par->sample_aspect_ratio;
codec->has_b_frames = par->video_delay;
codec->framerate = par->framerate;
codec->alpha_mode = par->alpha_mode;
break;
case AVMEDIA_TYPE_AUDIO:
codec->sample_fmt = par->format;
ret = av_channel_layout_copy(&codec->ch_layout, &par->ch_layout);
if (ret < 0)
return ret;
codec->sample_rate = par->sample_rate;
codec->block_align = par->block_align;
codec->frame_size = par->frame_size;
codec->delay =
codec->initial_padding = par->initial_padding;
codec->trailing_padding = par->trailing_padding;
codec->seek_preroll = par->seek_preroll;
break;
case AVMEDIA_TYPE_SUBTITLE:
codec->width = par->width;
codec->height = par->height;
break;
}
av_freep(&codec->extradata);
codec->extradata_size = 0;
if (par->extradata) {
codec->extradata = av_mallocz(par->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!codec->extradata)
return AVERROR(ENOMEM);
memcpy(codec->extradata, par->extradata, par->extradata_size);
codec->extradata_size = par->extradata_size;
}
av_packet_side_data_free(&codec->coded_side_data, &codec->nb_coded_side_data);
ret = codec_parameters_copy_side_data(&codec->coded_side_data, &codec->nb_coded_side_data,
par->coded_side_data, par->nb_coded_side_data);
if (ret < 0)
return ret;
return 0;
}
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