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avcodec/h264: Do not fail with randomly truncated VUIs

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Fixes Ticket4445

Tested-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2015-04-10 18:35:07 +02:00
parent 4d0f6d3fb4
commit bc48c88918
4 changed files with 13 additions and 7 deletions
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9
libavcodec/h264.c
View File

@ -1634,7 +1634,9 @@ again:
break;
case NAL_SPS:
init_get_bits(&h->gb, ptr, bit_length);
if (ff_h264_decode_seq_parameter_set(h) < 0 && (h->is_avc ? nalsize : 1)) {
if (ff_h264_decode_seq_parameter_set(h, 0) >= 0)
break;
if (h->is_avc ? nalsize : 1) {
av_log(h->avctx, AV_LOG_DEBUG,
"SPS decoding failure, trying again with the complete NAL\n");
if (h->is_avc)
@ -1643,8 +1645,11 @@ again:
break;
init_get_bits(&h->gb, &buf[buf_index + 1 - consumed],
8*(next_avc - buf_index + consumed - 1));
ff_h264_decode_seq_parameter_set(h);
if (ff_h264_decode_seq_parameter_set(h, 0) >= 0)
break;
}
init_get_bits(&h->gb, ptr, bit_length);
ff_h264_decode_seq_parameter_set(h, 1);
break;
case NAL_PPS:

2
libavcodec/h264.h
View File

@ -812,7 +812,7 @@ int ff_h264_decode_sei(H264Context *h);
/**
* Decode SPS
*/
int ff_h264_decode_seq_parameter_set(H264Context *h);
int ff_h264_decode_seq_parameter_set(H264Context *h, int ignore_truncation);
/**
* compute profile from sps

2
libavcodec/h264_parser.c
View File

@ -282,7 +282,7 @@ static inline int parse_nal_units(AVCodecParserContext *s,
init_get_bits(&h->gb, ptr, 8 * dst_length);
switch (h->nal_unit_type) {
case NAL_SPS:
ff_h264_decode_seq_parameter_set(h);
ff_h264_decode_seq_parameter_set(h, 0);
break;
case NAL_PPS:
ff_h264_decode_picture_parameter_set(h, h->gb.size_in_bits);

7
libavcodec/h264_ps.c
View File

@ -297,7 +297,7 @@ static void decode_scaling_matrices(H264Context *h, SPS *sps,
}
}
int ff_h264_decode_seq_parameter_set(H264Context *h)
int ff_h264_decode_seq_parameter_set(H264Context *h, int ignore_truncation)
{
int profile_idc, level_idc, constraint_set_flags = 0;
unsigned int sps_id;
@ -518,9 +518,10 @@ int ff_h264_decode_seq_parameter_set(H264Context *h)
}
if (get_bits_left(&h->gb) < 0) {
av_log(h->avctx, AV_LOG_ERROR,
av_log(h->avctx, ignore_truncation ? AV_LOG_WARNING : AV_LOG_ERROR,
"Overread %s by %d bits\n", sps->vui_parameters_present_flag ? "VUI" : "SPS", -get_bits_left(&h->gb));
goto fail;
if (!ignore_truncation)
goto fail;
}
if (!sps->sar.den)