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Code Issues Releases Activity

h264: disable ER by default

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The way it is currently designed is fundamentally unsafe and cannot be
reasonably fixed without completely rewriting it.
This commit is contained in:
Anton Khirnov 2015-03-31 10:35:15 +02:00
parent 3892bdab9b
commit a4d34e218f
4 changed files with 30 additions and 2 deletions
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22
libavcodec/h264.c
View File

@ -28,6 +28,7 @@
#include "libavutil/avassert.h"
#include "libavutil/display.h"
#include "libavutil/imgutils.h"
#include "libavutil/opt.h"
#include "libavutil/stereo3d.h"
#include "libavutil/timer.h"
#include "internal.h"
@ -666,6 +667,12 @@ av_cold int ff_h264_decode_init(AVCodecContext *avctx)
avctx->internal->allocate_progress = 1;
if (h->enable_er) {
av_log(avctx, AV_LOG_WARNING,
"Error resilience is enabled. It is unsafe and unsupported and may crash. "
"Use it at your own risk\n");
}
return 0;
}
@ -1786,6 +1793,20 @@ static av_cold int h264_decode_end(AVCodecContext *avctx)
return 0;
}
#define OFFSET(x) offsetof(H264Context, x)
#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
static const AVOption h264_options[] = {
{ "enable_er", "Enable error resilience on damaged frames (unsafe)", OFFSET(enable_er), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, VD },
{ NULL },
};
static const AVClass h264_class = {
.class_name = "h264",
.item_name = av_default_item_name,
.option = h264_options,
.version = LIBAVUTIL_VERSION_INT,
};
static const AVProfile profiles[] = {
{ FF_PROFILE_H264_BASELINE, "Baseline" },
{ FF_PROFILE_H264_CONSTRAINED_BASELINE, "Constrained Baseline" },
@ -1819,4 +1840,5 @@ AVCodec ff_h264_decoder = {
.init_thread_copy = ONLY_IF_THREADS_ENABLED(decode_init_thread_copy),
.update_thread_context = ONLY_IF_THREADS_ENABLED(ff_h264_update_thread_context),
.profiles = NULL_IF_CONFIG_SMALL(profiles),
.priv_class = &h264_class,
};

2
libavcodec/h264.h
View File

@ -727,6 +727,8 @@ typedef struct H264Context {
int cur_chroma_format_idc;
int enable_er;
AVBufferPool *qscale_table_pool;
AVBufferPool *mb_type_pool;
AVBufferPool *motion_val_pool;

2
libavcodec/h264_picture.c
View File

@ -184,7 +184,7 @@ int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup)
* past end by one (callers fault) and resync_mb_y != 0
* causes problems for the first MB line, too.
*/
if (!FIELD_PICTURE(h)) {
if (!FIELD_PICTURE(h) && h->enable_er) {
h264_set_erpic(&sl->er.cur_pic, h->cur_pic_ptr);
h264_set_erpic(&sl->er.last_pic,
sl->ref_count[0] ? sl->ref_list[0][0].parent : NULL);

6
libavcodec/h264_slice.c
View File

@ -530,6 +530,7 @@ int ff_h264_update_thread_context(AVCodecContext *dst,
return ret;
}
h->enable_er = h1->enable_er;
h->workaround_bugs = h1->workaround_bugs;
h->low_delay = h1->low_delay;
h->droppable = h1->droppable;
@ -633,7 +634,7 @@ static int h264_frame_start(H264Context *h)
if ((ret = ff_h264_ref_picture(h, &h->cur_pic, h->cur_pic_ptr)) < 0)
return ret;
if (CONFIG_ERROR_RESILIENCE)
if (CONFIG_ERROR_RESILIENCE && h->enable_er)
ff_er_frame_start(&h->slice_ctx[0].er);
for (i = 0; i < 16; i++) {
@ -2061,6 +2062,9 @@ static void er_add_slice(H264SliceContext *sl,
#if CONFIG_ERROR_RESILIENCE
ERContext *er = &sl->er;
if (!sl->h264->enable_er)
return;
er->ref_count = sl->ref_count[0];
ff_er_add_slice(er, startx, starty, endx, endy, status);
#endif