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FFmpeg/libavcodec/codec_par.c
Marton Balint ef2b3efd51 avcodec/codec_par: do not copy AVChannelLayout struct directly 
Later we use av_channel_layout_copy, but that uninits the struct
unintentionally freeing the possibly allocated u.map pointer.

Signed-off-by: Marton Balint <cus@passwd.hu>
2022-03-15 16:24:52 +01:00

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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"
static void codec_parameters_reset(AVCodecParameters *par)
{
av_freep(&par->extradata);
av_channel_layout_uninit(&par->ch_layout);
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->profile = FF_PROFILE_UNKNOWN;
par->level = FF_LEVEL_UNKNOWN;
}
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);
}
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;
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 = 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;
break;
case AVMEDIA_TYPE_AUDIO:
par->format = codec->sample_fmt;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
// if the old/new fields are set inconsistently, prefer the old ones
if ((codec->channels && codec->channels != codec->ch_layout.nb_channels) ||
(codec->channel_layout && (codec->ch_layout.order != AV_CHANNEL_ORDER_NATIVE ||
codec->ch_layout.u.mask != codec->channel_layout))) {
if (codec->channel_layout)
av_channel_layout_from_mask(&par->ch_layout, codec->channel_layout);
else {
par->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
par->ch_layout.nb_channels = codec->channels;
}
FF_ENABLE_DEPRECATION_WARNINGS
} else {
#endif
ret = av_channel_layout_copy(&par->ch_layout, &codec->ch_layout);
if (ret < 0)
return ret;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
}
par->channel_layout = par->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
par->ch_layout.u.mask : 0;
par->channels = par->ch_layout.nb_channels;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
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;
}
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;
break;
case AVMEDIA_TYPE_AUDIO:
codec->sample_fmt = par->format;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
// if the old/new fields are set inconsistently, prefer the old ones
if ((par->channels && par->channels != par->ch_layout.nb_channels) ||
(par->channel_layout && (par->ch_layout.order != AV_CHANNEL_ORDER_NATIVE ||
par->ch_layout.u.mask != par->channel_layout))) {
if (par->channel_layout)
av_channel_layout_from_mask(&codec->ch_layout, par->channel_layout);
else {
codec->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
codec->ch_layout.nb_channels = par->channels;
}
FF_ENABLE_DEPRECATION_WARNINGS
} else {
#endif
ret = av_channel_layout_copy(&codec->ch_layout, &par->ch_layout);
if (ret < 0)
return ret;
#if FF_API_OLD_CHANNEL_LAYOUT
FF_DISABLE_DEPRECATION_WARNINGS
}
codec->channel_layout = codec->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ?
codec->ch_layout.u.mask : 0;
codec->channels = codec->ch_layout.nb_channels;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
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;
}
if (par->extradata) {
av_freep(&codec->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;
}
return 0;
}
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