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h264: set parameters from SPS whenever it changes

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Fixes a crash in the fuzzed sample sample_varPAR.avi_s26638 with
alternating bit depths.
This commit is contained in:
Janne Grunau 2012-11-16 01:12:40 +01:00
parent 0ee440fe38
commit 072be3e896
3 changed files with 68 additions and 49 deletions
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108
libavcodec/h264.c
View File

@ -2340,6 +2340,52 @@ int ff_h264_get_profile(SPS *sps)
return profile;
}
static int h264_set_parameter_from_sps(H264Context *h)
{
MpegEncContext *s = &h->s;
if (s->flags & CODEC_FLAG_LOW_DELAY ||
(h->sps.bitstream_restriction_flag &&
!h->sps.num_reorder_frames)) {
if (s->avctx->has_b_frames > 1 || h->delayed_pic[0])
av_log(h->s.avctx, AV_LOG_WARNING, "Delayed frames seen. "
"Reenabling low delay requires a codec flush.\n");
else
s->low_delay = 1;
}
if (s->avctx->has_b_frames < 2)
s->avctx->has_b_frames = !s->low_delay;
if (s->avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
h->cur_chroma_format_idc != h->sps.chroma_format_idc) {
if (s->avctx->codec &&
s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU &&
(h->sps.bit_depth_luma != 8 || h->sps.chroma_format_idc > 1)) {
av_log(s->avctx, AV_LOG_ERROR,
"VDPAU decoding does not support video colorspace.\n");
return AVERROR_INVALIDDATA;
}
if (h->sps.bit_depth_luma >= 8 && h->sps.bit_depth_luma <= 10) {
s->avctx->bits_per_raw_sample = h->sps.bit_depth_luma;
h->cur_chroma_format_idc = h->sps.chroma_format_idc;
h->pixel_shift = h->sps.bit_depth_luma > 8;
ff_h264dsp_init(&h->h264dsp, h->sps.bit_depth_luma,
h->sps.chroma_format_idc);
ff_h264_pred_init(&h->hpc, s->codec_id, h->sps.bit_depth_luma,
h->sps.chroma_format_idc);
s->dsp.dct_bits = h->sps.bit_depth_luma > 8 ? 32 : 16;
ff_dsputil_init(&s->dsp, s->avctx);
} else {
av_log(s->avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n",
h->sps.bit_depth_luma);
return AVERROR_INVALIDDATA;
}
}
return 0;
}
/**
* Decode a slice header.
* This will also call ff_MPV_common_init() and frame_start() as needed.
@ -2356,7 +2402,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
MpegEncContext *const s0 = &h0->s;
unsigned int first_mb_in_slice;
unsigned int pps_id;
int num_ref_idx_active_override_flag, max_refs;
int num_ref_idx_active_override_flag, max_refs, ret;
unsigned int slice_type, tmp, i, j;
int default_ref_list_done = 0;
int last_pic_structure, last_pic_droppable;
@ -2432,7 +2478,17 @@ static int decode_slice_header(H264Context *h, H264Context *h0)
h->pps.sps_id);
return -1;
}
h->sps = *h0->sps_buffers[h->pps.sps_id];
if (h->pps.sps_id != h->current_sps_id ||
h0->sps_buffers[h->pps.sps_id]->new) {
h0->sps_buffers[h->pps.sps_id]->new = 0;
h->current_sps_id = h->pps.sps_id;
h->sps = *h0->sps_buffers[h->pps.sps_id];
if ((ret = h264_set_parameter_from_sps(h)) < 0)
return ret;
}
s->avctx->profile = ff_h264_get_profile(&h->sps);
s->avctx->level = h->sps.level_idc;
@ -3878,51 +3934,9 @@ again:
ff_h264_decode_seq_parameter_set(h);
}
if (s->flags & CODEC_FLAG_LOW_DELAY ||
(h->sps.bitstream_restriction_flag &&
!h->sps.num_reorder_frames)) {
if (s->avctx->has_b_frames > 1 || h->delayed_pic[0])
av_log(avctx, AV_LOG_WARNING, "Delayed frames seen "
"reenabling low delay requires a codec "
"flush.\n");
else
s->low_delay = 1;
}
if (avctx->has_b_frames < 2)
avctx->has_b_frames = !s->low_delay;
if (avctx->bits_per_raw_sample != h->sps.bit_depth_luma ||
h->cur_chroma_format_idc != h->sps.chroma_format_idc) {
if (s->avctx->codec &&
s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU
&& (h->sps.bit_depth_luma != 8 ||
h->sps.chroma_format_idc > 1)) {
av_log(avctx, AV_LOG_ERROR,
"VDPAU decoding does not support video "
"colorspace\n");
buf_index = -1;
goto end;
}
if (h->sps.bit_depth_luma >= 8 && h->sps.bit_depth_luma <= 10) {
avctx->bits_per_raw_sample = h->sps.bit_depth_luma;
h->cur_chroma_format_idc = h->sps.chroma_format_idc;
h->pixel_shift = h->sps.bit_depth_luma > 8;
ff_h264dsp_init(&h->h264dsp, h->sps.bit_depth_luma,
h->sps.chroma_format_idc);
ff_h264_pred_init(&h->hpc, s->codec_id,
h->sps.bit_depth_luma,
h->sps.chroma_format_idc);
s->dsp.dct_bits = h->sps.bit_depth_luma > 8 ? 32 : 16;
ff_dsputil_init(&s->dsp, s->avctx);
} else {
av_log(avctx, AV_LOG_ERROR,
"Unsupported bit depth: %d\n",
h->sps.bit_depth_luma);
buf_index = -1;
goto end;
}
if (h264_set_parameter_from_sps(h) < 0) {
buf_index = -1;
goto end;
}
break;
case NAL_PPS:

2
libavcodec/h264.h
View File

@ -203,6 +203,7 @@ typedef struct SPS {
int bit_depth_chroma; ///< bit_depth_chroma_minus8 + 8
int residual_color_transform_flag; ///< residual_colour_transform_flag
int constraint_set_flags; ///< constraint_set[0-3]_flag
int new; ///< flag to keep track if the decoder context needs re-init due to changed SPS
} SPS;
/**
@ -329,6 +330,7 @@ typedef struct H264Context {
int emu_edge_width;
int emu_edge_height;
unsigned current_sps_id; ///< id of the current SPS
SPS sps; ///< current sps
/**

7
libavcodec/h264_ps.c
View File

@ -459,10 +459,13 @@ int ff_h264_decode_seq_parameter_set(H264Context *h){
sps->timing_info_present_flag ? sps->time_scale : 0
);
}
sps->new = 1;
av_free(h->sps_buffers[sps_id]);
h->sps_buffers[sps_id]= sps;
h->sps = *sps;
h->sps_buffers[sps_id] = sps;
h->sps = *sps;
h->current_sps_id = sps_id;
return 0;
fail:
av_free(sps);