Andreas Rheinhardt:
> Add a pointer parameter that if supplied will be used to return
> the updated decode_error_flags. This will allow to fix several
> races when using frame-threading; these resulted from AVFrame
> that the earlier code updated concurrently being used as source
> in an av_frame_ref() call in the decoder's update_thread_context.
>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
> ---
> libavcodec/error_resilience.c | 7 +++++--
> libavcodec/error_resilience.h | 12 +++++++++++-
> libavcodec/h263dec.c | 2 +-
> libavcodec/h264dec.c | 2 +-
> libavcodec/mpeg12dec.c | 2 +-
> libavcodec/mss2.c | 2 +-
> libavcodec/rv10.c | 4 ++--
> libavcodec/rv34.c | 6 +++---
> libavcodec/vc1dec.c | 2 +-
> 9 files changed, 26 insertions(+), 13 deletions(-)
>
> diff --git a/libavcodec/error_resilience.c b/libavcodec/error_resilience.c
> index 68e20925e0..880aea6f30 100644
> --- a/libavcodec/error_resilience.c
> +++ b/libavcodec/error_resilience.c
> @@ -889,7 +889,7 @@ void ff_er_add_slice(ERContext *s, int startx, int starty,
> }
> }
>
> -void ff_er_frame_end(ERContext *s)
> +void ff_er_frame_end(ERContext *s, int *decode_error_flags)
> {
> int *linesize = NULL;
> int i, mb_x, mb_y, error, error_type, dc_error, mv_error, ac_error;
> @@ -1114,7 +1114,10 @@ void ff_er_frame_end(ERContext *s)
> av_log(s->avctx, AV_LOG_INFO, "concealing %d DC, %d AC, %d MV errors in
> %c frame\n",
> dc_error, ac_error, mv_error,
> av_get_picture_type_char(s->cur_pic.f->pict_type));
>
> - s->cur_pic.f->decode_error_flags |= FF_DECODE_ERROR_CONCEALMENT_ACTIVE;
> + if (decode_error_flags)
> + *decode_error_flags |= FF_DECODE_ERROR_CONCEALMENT_ACTIVE;
> + else
> + s->cur_pic.f->decode_error_flags |=
> FF_DECODE_ERROR_CONCEALMENT_ACTIVE;
>
> is_intra_likely = is_intra_more_likely(s);
>
> diff --git a/libavcodec/error_resilience.h b/libavcodec/error_resilience.h
> index 47cc8a4fc6..b03f8ec896 100644
> --- a/libavcodec/error_resilience.h
> +++ b/libavcodec/error_resilience.h
> @@ -90,7 +90,17 @@ typedef struct ERContext {
> } ERContext;
>
> void ff_er_frame_start(ERContext *s);
> -void ff_er_frame_end(ERContext *s);
> +
> +/**
> + * Indicate that a frame has finished decoding and perform error concealment
> + * in case it has been enabled and is necessary and supported.
> + *
> + * @param s ERContext in use
> + * @param decode_error_flags pointer where updated decode_error_flags are
> written
> + * if supplied; if not, the new flags are directly
> + * applied to the AVFrame whose errors are
> concealed
> + */
> +void ff_er_frame_end(ERContext *s, int *decode_error_flags);
> void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int
> endy,
> int status);
>
> diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
> index 52e51dd489..9f63f1a7cb 100644
> --- a/libavcodec/h263dec.c
> +++ b/libavcodec/h263dec.c
> @@ -622,7 +622,7 @@ retry:
> av_assert1(s->bitstream_buffer_size == 0);
> frame_end:
> if (!s->studio_profile)
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
>
> if (avctx->hwaccel) {
> ret = FF_HW_SIMPLE_CALL(avctx, end_frame);
> diff --git a/libavcodec/h264dec.c b/libavcodec/h264dec.c
> index f13b1081fc..8e90678125 100644
> --- a/libavcodec/h264dec.c
> +++ b/libavcodec/h264dec.c
> @@ -779,7 +779,7 @@ end:
> if (sl->ref_count[1])
> ff_h264_set_erpic(&h->er.next_pic, sl->ref_list[1][0].parent);
>
> - ff_er_frame_end(&h->er);
> + ff_er_frame_end(&h->er, NULL);
> if (use_last_pic)
> memset(&sl->ref_list[0][0], 0, sizeof(sl->ref_list[0][0]));
> }
> diff --git a/libavcodec/mpeg12dec.c b/libavcodec/mpeg12dec.c
> index 1accd07e9e..4b5341b914 100644
> --- a/libavcodec/mpeg12dec.c
> +++ b/libavcodec/mpeg12dec.c
> @@ -2033,7 +2033,7 @@ static int slice_end(AVCodecContext *avctx, AVFrame
> *pict)
> if (/* s->mb_y << field_pic == s->mb_height && */ !s->first_field &&
> !s1->first_slice) {
> /* end of image */
>
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
>
> ff_mpv_frame_end(s);
>
> diff --git a/libavcodec/mss2.c b/libavcodec/mss2.c
> index 70aa56cb84..2237cc8bb1 100644
> --- a/libavcodec/mss2.c
> +++ b/libavcodec/mss2.c
> @@ -422,7 +422,7 @@ static int decode_wmv9(AVCodecContext *avctx, const
> uint8_t *buf, int buf_size,
> ff_vc1_decode_blocks(v);
>
> if (v->end_mb_x == s->mb_width && s->end_mb_y == s->mb_height) {
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
> } else {
> av_log(v->s.avctx, AV_LOG_WARNING,
> "disabling error correction due to block count mismatch %dx%d
> != %dx%d\n",
> diff --git a/libavcodec/rv10.c b/libavcodec/rv10.c
> index 5edd934f82..6abceade4e 100644
> --- a/libavcodec/rv10.c
> +++ b/libavcodec/rv10.c
> @@ -477,7 +477,7 @@ static int rv10_decode_packet(AVCodecContext *avctx,
> const uint8_t *buf,
> if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
> // FIXME write parser so we always have complete frames?
> if (s->current_picture_ptr) {
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
> ff_mpv_frame_end(s);
> s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
> }
> @@ -649,7 +649,7 @@ static int rv10_decode_frame(AVCodecContext *avctx,
> AVFrame *pict,
> }
>
> if (s->current_picture_ptr && s->mb_y >= s->mb_height) {
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
> ff_mpv_frame_end(s);
>
> if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
> diff --git a/libavcodec/rv34.c b/libavcodec/rv34.c
> index af4d6a3400..e9660bb457 100644
> --- a/libavcodec/rv34.c
> +++ b/libavcodec/rv34.c
> @@ -1560,7 +1560,7 @@ static int finish_frame(AVCodecContext *avctx, AVFrame
> *pict)
> MpegEncContext *s = &r->s;
> int got_picture = 0, ret;
>
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
> ff_mpv_frame_end(s);
> s->mb_num_left = 0;
>
> @@ -1655,7 +1655,7 @@ int ff_rv34_decode_frame(AVCodecContext *avctx, AVFrame
> *pict,
> av_log(avctx, AV_LOG_ERROR, "New frame but still %d MB left.\n",
> s->mb_num_left);
> if (!s->context_reinit)
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
> ff_mpv_frame_end(s);
> }
>
> @@ -1790,7 +1790,7 @@ int ff_rv34_decode_frame(AVCodecContext *avctx, AVFrame
> *pict,
> av_log(avctx, AV_LOG_INFO, "marking unfished frame as
> finished\n");
> /* always mark the current frame as finished, frame-mt supports
> * only complete frames */
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
> ff_mpv_frame_end(s);
> s->mb_num_left = 0;
> ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX,
> 0);
> diff --git a/libavcodec/vc1dec.c b/libavcodec/vc1dec.c
> index b8663aaf98..449d2fea5e 100644
> --- a/libavcodec/vc1dec.c
> +++ b/libavcodec/vc1dec.c
> @@ -1348,7 +1348,7 @@ static int vc1_decode_frame(AVCodecContext *avctx,
> AVFrame *pict,
> if ( !v->field_mode
> && avctx->codec_id != AV_CODEC_ID_WMV3IMAGE
> && avctx->codec_id != AV_CODEC_ID_VC1IMAGE)
> - ff_er_frame_end(&s->er);
> + ff_er_frame_end(&s->er, NULL);
> }
>
> ff_mpv_frame_end(s);
Will apply this patchset tomorrow unless there are objections.
- Andreas
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