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Code Issues Releases Activity

cbs_vp9: Ensure that reserved zero bits are actually zero

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This commit is contained in:
Mark Thompson 2018-10-27 20:41:00 +01:00
parent ad5ca1fb72
commit edcdf35123
3 changed files with 16 additions and 5 deletions
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13
libavcodec/cbs_vp9.c
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@ -314,6 +314,12 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
current->name = prob; \
} while (0)
#define fixed(width, name, value) do { \
av_unused uint32_t fixed_value = value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
0, &fixed_value, value, value)); \
} while (0)
#define infer(name, value) do { \
current->name = value; \
} while (0)
@ -331,6 +337,7 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
#undef fle
#undef delta_q
#undef prob
#undef fixed
#undef infer
#undef byte_alignment
@ -370,6 +377,11 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
xf(8, name.prob, current->name, subs, __VA_ARGS__); \
} while (0)
#define fixed(width, name, value) do { \
CHECK(ff_cbs_write_unsigned(ctx, rw, width, #name, \
0, value, value, value)); \
} while (0)
#define infer(name, value) do { \
if (current->name != (value)) { \
av_log(ctx->log_ctx, AV_LOG_WARNING, "Warning: " \
@ -392,6 +404,7 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
#undef fle
#undef delta_q
#undef prob
#undef fixed
#undef infer
#undef byte_alignment

2
libavcodec/cbs_vp9.h
View File

@ -84,7 +84,6 @@ typedef struct VP9RawFrameHeader {
uint8_t frame_marker;
uint8_t profile_low_bit;
uint8_t profile_high_bit;
uint8_t profile_reserved_zero;
uint8_t show_existing_frame;
uint8_t frame_to_show_map_idx;
@ -99,7 +98,6 @@ typedef struct VP9RawFrameHeader {
uint8_t color_range;
uint8_t subsampling_x;
uint8_t subsampling_y;
uint8_t color_config_reserved_zero;
uint8_t refresh_frame_flags;

6
libavcodec/cbs_vp9_syntax_template.c
View File

@ -55,7 +55,7 @@ static int FUNC(color_config)(CodedBitstreamContext *ctx, RWContext *rw,
if (profile == 1 || profile == 3) {
f(1, subsampling_x);
f(1, subsampling_y);
f(1, color_config_reserved_zero);
fixed(1, reserved_zero, 0);
} else {
infer(subsampling_x, 1);
infer(subsampling_y, 1);
@ -65,7 +65,7 @@ static int FUNC(color_config)(CodedBitstreamContext *ctx, RWContext *rw,
if (profile == 1 || profile == 3) {
infer(subsampling_x, 0);
infer(subsampling_y, 0);
f(1, color_config_reserved_zero);
fixed(1, reserved_zero, 0);
}
}
@ -258,7 +258,7 @@ static int FUNC(uncompressed_header)(CodedBitstreamContext *ctx, RWContext *rw,
f(1, profile_high_bit);
profile = (current->profile_high_bit << 1) + current->profile_low_bit;
if (profile == 3)
f(1, profile_reserved_zero);
fixed(1, reserved_zero, 0);
f(1, show_existing_frame);
if (current->show_existing_frame) {