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lavc/frame_thread_encoder: avoid assigning a whole AVCodecContext

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It is highly unsafe, as AVCodecContext contains many allocated fields.
Almost everything needed by worker threads should be covered by
routing through AVCodecParameters and av_opt_copy(), except for a few
fields that are copied manually.

avcodec_free_context() can now be used for per-thread contexts.
This commit is contained in:
Anton Khirnov 2024-03-22 20:59:13 +01:00
parent 198a7788e7
commit e1f384adbf
1 changed files with 42 additions and 10 deletions
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52
libavcodec/frame_thread_encoder.c
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@ -28,6 +28,7 @@
#include "libavutil/thread.h"
#include "avcodec.h"
#include "avcodec_internal.h"
#include "codec_par.h"
#include "encode.h"
#include "internal.h"
#include "pthread_internal.h"
@ -111,8 +112,7 @@ static void * attribute_align_arg worker(void *v){
pthread_mutex_unlock(&c->finished_task_mutex);
}
end:
ff_codec_close(avctx);
av_freep(&avctx);
avcodec_free_context(&avctx);
return NULL;
}
@ -121,6 +121,7 @@ av_cold int ff_frame_thread_encoder_init(AVCodecContext *avctx)
int i=0;
ThreadContext *c;
AVCodecContext *thread_avctx = NULL;
AVCodecParameters *par = NULL;
int ret;
if( !(avctx->thread_type & FF_THREAD_FRAME)
@ -194,18 +195,27 @@ av_cold int ff_frame_thread_encoder_init(AVCodecContext *avctx)
}
}
par = avcodec_parameters_alloc();
if (!par) {
ret = AVERROR(ENOMEM);
goto fail;
}
ret = avcodec_parameters_from_context(par, avctx);
if (ret < 0)
goto fail;
for(i=0; i<avctx->thread_count ; i++){
void *tmpv;
thread_avctx = avcodec_alloc_context3(avctx->codec);
if (!thread_avctx) {
ret = AVERROR(ENOMEM);
goto fail;
}
tmpv = thread_avctx->priv_data;
*thread_avctx = *avctx;
thread_avctx->priv_data = tmpv;
thread_avctx->internal = NULL;
thread_avctx->hw_frames_ctx = NULL;
ret = avcodec_parameters_to_context(thread_avctx, par);
if (ret < 0)
goto fail;
ret = av_opt_copy(thread_avctx, avctx);
if (ret < 0)
goto fail;
@ -217,6 +227,26 @@ av_cold int ff_frame_thread_encoder_init(AVCodecContext *avctx)
thread_avctx->thread_count = 1;
thread_avctx->active_thread_type &= ~FF_THREAD_FRAME;
#define DUP_MATRIX(m) \
if (avctx->m) { \
thread_avctx->m = av_memdup(avctx->m, 64 * sizeof(*avctx->m)); \
if (!thread_avctx->m) { \
ret = AVERROR(ENOMEM); \
goto fail; \
} \
}
DUP_MATRIX(intra_matrix);
DUP_MATRIX(chroma_intra_matrix);
DUP_MATRIX(inter_matrix);
#undef DUP_MATRIX
thread_avctx->opaque = avctx->opaque;
thread_avctx->get_encode_buffer = avctx->get_encode_buffer;
thread_avctx->execute = avctx->execute;
thread_avctx->execute2 = avctx->execute2;
thread_avctx->stats_in = avctx->stats_in;
if ((ret = avcodec_open2(thread_avctx, avctx->codec, NULL)) < 0)
goto fail;
av_assert0(!thread_avctx->internal->frame_thread_encoder);
@ -227,12 +257,14 @@ av_cold int ff_frame_thread_encoder_init(AVCodecContext *avctx)
}
}
avcodec_parameters_free(&par);
avctx->active_thread_type = FF_THREAD_FRAME;
return 0;
fail:
ff_codec_close(thread_avctx);
av_freep(&thread_avctx);
avcodec_parameters_free(&par);
avcodec_free_context(&thread_avctx);
avctx->thread_count = i;
av_log(avctx, AV_LOG_ERROR, "ff_frame_thread_encoder_init failed\n");
ff_frame_thread_encoder_free(avctx);