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Fix max value of log2_max_mv_length (#391)

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H264 standard states "log2_max_mv_length_horizontal and log2_max_mv_length_vertical indicate the maximum absolute value of a decoded horizontal and vertical motion vector component, respectively, in ¼ luma sample units, for all pictures in the coded video sequence. [ ] The value of log2_max_mv_length_horizontal shall be in the range of 0 to 15, inclusive. The value of log2_max_mv_length_vertical shall be in the range of 0 to 15, inclusive".

However some hardware decoders seem to produce log2_max_mv_length with values of 16.
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jcdr428 2021-01-11 00:13:19 +02:00 committed by GitHub
parent e6b1ed8ebe
commit 00caad02ea
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1 changed files with 2 additions and 2 deletions
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tsMuxer/nalUnits.cpp
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@ -802,10 +802,10 @@ int SPSUnit::deserializeVuiParameters()
if (max_bits_per_mb_denom > 16)
return 1;
unsigned log2_max_mv_length_horizontal = extractUEGolombCode();
if (log2_max_mv_length_horizontal >= 16)
if (log2_max_mv_length_horizontal > 16)
return 1;
unsigned log2_max_mv_length_vertical = extractUEGolombCode();
if (log2_max_mv_length_vertical >= 16)
if (log2_max_mv_length_vertical > 16)
return 1;
unsigned num_reorder_frames = extractUEGolombCode();
unsigned max_dec_frame_buffering = extractUEGolombCode();