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h264: do not update the context fields copied between threads after finish_setup()

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Should fix a large number of possible races with frame threading.
This commit is contained in:
Anton Khirnov 2015-05-09 21:54:47 +02:00
parent 6d4d3fee63
commit 5ec0bdf2c5
3 changed files with 89 additions and 48 deletions
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7
libavcodec/h264.c
View File

@ -950,8 +950,12 @@ static void decode_postinit(H264Context *h, int setup_finished)
h->next_output_pic->recovered |= !!(h->frame_recovered & FRAME_RECOVERED_SEI);
}
if (setup_finished && !h->avctx->hwaccel)
if (setup_finished && !h->avctx->hwaccel) {
ff_thread_finish_setup(h->avctx);
if (h->avctx->active_thread_type & FF_THREAD_FRAME)
h->setup_finished = 1;
}
}
int ff_pred_weight_table(H264Context *h, H264SliceContext *sl)
@ -1618,6 +1622,7 @@ static int h264_decode_frame(AVCodecContext *avctx, void *data,
int ret;
h->flags = avctx->flags;
h->setup_finished = 0;
/* end of stream, output what is still in the buffers */
out:

5
libavcodec/h264.h
View File

@ -721,6 +721,11 @@ typedef struct H264Context {
int frame_recovered; ///< Initial frame has been completely recovered
/* for frame threading, this is set to 1
* after finish_setup() has been called, so we cannot modify
* some context properties (which are supposed to stay constant between
* slices) anymore */
int setup_finished;
// Timestamp stuff
int sei_buffering_period_present; ///< Buffering period SEI flag

125
libavcodec/h264_slice.c
View File

@ -1039,6 +1039,8 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
int last_pic_structure, last_pic_droppable;
int needs_reinit = 0;
int field_pic_flag, bottom_field_flag;
int frame_num, droppable, picture_structure;
int mb_aff_frame = 0;
h->qpel_put = h->h264qpel.put_h264_qpel_pixels_tab;
h->qpel_avg = h->h264qpel.avg_h264_qpel_pixels_tab;
@ -1088,7 +1090,8 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
}
// to make a few old functions happy, it's wrong though
h->pict_type = sl->slice_type;
if (!h->setup_finished)
h->pict_type = sl->slice_type;
pps_id = get_ue_golomb(&sl->gb);
if (pps_id >= MAX_PPS_COUNT) {
@ -1101,7 +1104,12 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
pps_id);
return AVERROR_INVALIDDATA;
}
h->pps = *h->pps_buffers[pps_id];
if (!h->setup_finished) {
h->pps = *h->pps_buffers[pps_id];
} else if (h->dequant_coeff_pps != pps_id) {
av_log(h->avctx, AV_LOG_ERROR, "PPS changed between slices\n");
return AVERROR_INVALIDDATA;
}
if (!h->sps_buffers[h->pps.sps_id]) {
av_log(h->avctx, AV_LOG_ERROR,
@ -1135,39 +1143,41 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
}
h->avctx->profile = ff_h264_get_profile(&h->sps);
h->avctx->level = h->sps.level_idc;
h->avctx->refs = h->sps.ref_frame_count;
if (!h->setup_finished) {
h->avctx->profile = ff_h264_get_profile(&h->sps);
h->avctx->level = h->sps.level_idc;
h->avctx->refs = h->sps.ref_frame_count;
if (h->mb_width != h->sps.mb_width ||
h->mb_height != h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag))
needs_reinit = 1;
if (h->mb_width != h->sps.mb_width ||
h->mb_height != h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag))
needs_reinit = 1;
h->mb_width = h->sps.mb_width;
h->mb_height = h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);
h->mb_num = h->mb_width * h->mb_height;
h->mb_stride = h->mb_width + 1;
h->mb_width = h->sps.mb_width;
h->mb_height = h->sps.mb_height * (2 - h->sps.frame_mbs_only_flag);
h->mb_num = h->mb_width * h->mb_height;
h->mb_stride = h->mb_width + 1;
h->b_stride = h->mb_width * 4;
h->b_stride = h->mb_width * 4;
h->chroma_y_shift = h->sps.chroma_format_idc <= 1; // 400 uses yuv420p
h->chroma_y_shift = h->sps.chroma_format_idc <= 1; // 400 uses yuv420p
h->width = 16 * h->mb_width;
h->height = 16 * h->mb_height;
h->width = 16 * h->mb_width;
h->height = 16 * h->mb_height;
ret = init_dimensions(h);
if (ret < 0)
return ret;
ret = init_dimensions(h);
if (ret < 0)
return ret;
if (h->sps.video_signal_type_present_flag) {
h->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG
: AVCOL_RANGE_MPEG;
if (h->sps.colour_description_present_flag) {
if (h->avctx->colorspace != h->sps.colorspace)
needs_reinit = 1;
h->avctx->color_primaries = h->sps.color_primaries;
h->avctx->color_trc = h->sps.color_trc;
h->avctx->colorspace = h->sps.colorspace;
if (h->sps.video_signal_type_present_flag) {
h->avctx->color_range = h->sps.full_range ? AVCOL_RANGE_JPEG
: AVCOL_RANGE_MPEG;
if (h->sps.colour_description_present_flag) {
if (h->avctx->colorspace != h->sps.colorspace)
needs_reinit = 1;
h->avctx->color_primaries = h->sps.color_primaries;
h->avctx->color_trc = h->sps.color_trc;
h->avctx->colorspace = h->sps.colorspace;
}
}
}
@ -1221,35 +1231,41 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
h264_init_dequant_tables(h);
}
h->frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
frame_num = get_bits(&sl->gb, h->sps.log2_max_frame_num);
if (!h->setup_finished)
h->frame_num = frame_num;
sl->mb_mbaff = 0;
h->mb_aff_frame = 0;
last_pic_structure = h->picture_structure;
last_pic_droppable = h->droppable;
h->droppable = h->nal_ref_idc == 0;
droppable = h->nal_ref_idc == 0;
if (h->sps.frame_mbs_only_flag) {
h->picture_structure = PICT_FRAME;
picture_structure = PICT_FRAME;
} else {
field_pic_flag = get_bits1(&sl->gb);
if (field_pic_flag) {
bottom_field_flag = get_bits1(&sl->gb);
h->picture_structure = PICT_TOP_FIELD + bottom_field_flag;
picture_structure = PICT_TOP_FIELD + bottom_field_flag;
} else {
h->picture_structure = PICT_FRAME;
h->mb_aff_frame = h->sps.mb_aff;
picture_structure = PICT_FRAME;
mb_aff_frame = h->sps.mb_aff;
}
}
if (!h->setup_finished) {
h->droppable = droppable;
h->picture_structure = picture_structure;
h->mb_aff_frame = mb_aff_frame;
}
sl->mb_field_decoding_flag = h->picture_structure != PICT_FRAME;
if (h->current_slice != 0) {
if (last_pic_structure != h->picture_structure ||
last_pic_droppable != h->droppable) {
if (last_pic_structure != picture_structure ||
last_pic_droppable != droppable) {
av_log(h->avctx, AV_LOG_ERROR,
"Changing field mode (%d -> %d) between slices is not allowed\n",
last_pic_structure, h->picture_structure);
h->picture_structure = last_pic_structure;
h->droppable = last_pic_droppable;
return AVERROR_INVALIDDATA;
} else if (!h->cur_pic_ptr) {
av_log(h->avctx, AV_LOG_ERROR,
@ -1415,7 +1431,8 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
}
}
h->cur_pic_ptr->frame_num = h->frame_num; // FIXME frame_num cleanup
if (!h->setup_finished)
h->cur_pic_ptr->frame_num = h->frame_num; // FIXME frame_num cleanup
assert(h->mb_num == h->mb_width * h->mb_height);
if (first_mb_in_slice << FIELD_OR_MBAFF_PICTURE(h) >= h->mb_num ||
@ -1442,20 +1459,34 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
get_ue_golomb(&sl->gb); /* idr_pic_id */
if (h->sps.poc_type == 0) {
h->poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
int poc_lsb = get_bits(&sl->gb, h->sps.log2_max_poc_lsb);
if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
h->delta_poc_bottom = get_se_golomb(&sl->gb);
if (!h->setup_finished)
h->poc_lsb = poc_lsb;
if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME) {
int delta_poc_bottom = get_se_golomb(&sl->gb);
if (!h->setup_finished)
h->delta_poc_bottom = delta_poc_bottom;
}
}
if (h->sps.poc_type == 1 && !h->sps.delta_pic_order_always_zero_flag) {
h->delta_poc[0] = get_se_golomb(&sl->gb);
int delta_poc = get_se_golomb(&sl->gb);
if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME)
h->delta_poc[1] = get_se_golomb(&sl->gb);
if (!h->setup_finished)
h->delta_poc[0] = delta_poc;
if (h->pps.pic_order_present == 1 && h->picture_structure == PICT_FRAME) {
delta_poc = get_se_golomb(&sl->gb);
if (!h->setup_finished)
h->delta_poc[1] = delta_poc;
}
}
ff_init_poc(h, h->cur_pic_ptr->field_poc, &h->cur_pic_ptr->poc);
if (!h->setup_finished)
ff_init_poc(h, h->cur_pic_ptr->field_poc, &h->cur_pic_ptr->poc);
if (h->pps.redundant_pic_cnt_present)
sl->redundant_pic_count = get_ue_golomb(&sl->gb);