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cbs: Remove useless initializations 

Up until now, a temporary variable was used and initialized every time a
value was read in CBS; if reading turned out to be successfull, this
value was overwritten (without having ever been looked at) with the
value read if reading was successfull; on failure the variable wasn't
touched either. Therefore these initializations can be and have been
removed.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit b71a0367a6)
This commit is contained in:
Andreas Rheinhardt 2019-06-20 01:45:11 +02:00 committed by James Almer
parent 4bc84f4f7d
commit fd53f6745e
5 changed files with 17 additions and 17 deletions
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14
libavcodec/cbs_av1.c
View File

@ -574,7 +574,7 @@ static size_t cbs_av1_get_payload_bytes_left(GetBitContext *gbc)
#define RWContext GetBitContext
#define xf(width, name, var, range_min, range_max, subs, ...) do { \
uint32_t value = range_min; \
uint32_t value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
@ -582,7 +582,7 @@ static size_t cbs_av1_get_payload_bytes_left(GetBitContext *gbc)
} while (0)
#define xsu(width, name, var, subs, ...) do { \
int32_t value = 0; \
int32_t value; \
CHECK(ff_cbs_read_signed(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), &value, \
MIN_INT_BITS(width), \
@ -591,27 +591,27 @@ static size_t cbs_av1_get_payload_bytes_left(GetBitContext *gbc)
} while (0)
#define uvlc(name, range_min, range_max) do { \
uint32_t value = range_min; \
uint32_t value; \
CHECK(cbs_av1_read_uvlc(ctx, rw, #name, \
&value, range_min, range_max)); \
current->name = value; \
} while (0)
#define ns(max_value, name, subs, ...) do { \
uint32_t value = 0; \
uint32_t value; \
CHECK(cbs_av1_read_ns(ctx, rw, max_value, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
current->name = value; \
} while (0)
#define increment(name, min, max) do { \
uint32_t value = 0; \
uint32_t value; \
CHECK(cbs_av1_read_increment(ctx, rw, min, max, #name, &value)); \
current->name = value; \
} while (0)
#define subexp(name, max, subs, ...) do { \
uint32_t value = 0; \
uint32_t value; \
CHECK(cbs_av1_read_subexp(ctx, rw, max, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
current->name = value; \
@ -629,7 +629,7 @@ static size_t cbs_av1_get_payload_bytes_left(GetBitContext *gbc)
} while (0)
#define leb128(name) do { \
uint64_t value = 0; \
uint64_t value; \
CHECK(cbs_av1_read_leb128(ctx, rw, #name, &value)); \
current->name = value; \
} while (0)

8
libavcodec/cbs_h2645.c
View File

@ -289,28 +289,28 @@ static int cbs_write_se_golomb(CodedBitstreamContext *ctx, PutBitContext *pbc,
#define RWContext GetBitContext
#define xu(width, name, var, range_min, range_max, subs, ...) do { \
uint32_t value = range_min; \
uint32_t value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define xue(name, var, range_min, range_max, subs, ...) do { \
uint32_t value = range_min; \
uint32_t value; \
CHECK(cbs_read_ue_golomb(ctx, rw, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define xi(width, name, var, range_min, range_max, subs, ...) do { \
int32_t value = range_min; \
int32_t value; \
CHECK(ff_cbs_read_signed(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \
var = value; \
} while (0)
#define xse(name, var, range_min, range_max, subs, ...) do { \
int32_t value = range_min; \
int32_t value; \
CHECK(cbs_read_se_golomb(ctx, rw, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \

2
libavcodec/cbs_jpeg.c
View File

@ -45,7 +45,7 @@
#define FUNC(name) cbs_jpeg_read_ ## name
#define xu(width, name, range_min, range_max, subs, ...) do { \
uint32_t value = range_min; \
uint32_t value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \

2
libavcodec/cbs_mpeg2.c
View File

@ -57,7 +57,7 @@
#define RWContext GetBitContext
#define xui(width, name, var, range_min, range_max, subs, ...) do { \
uint32_t value = 0; \
uint32_t value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, range_min, range_max)); \

8
libavcodec/cbs_vp9.c
View File

@ -267,14 +267,14 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
#define RWContext GetBitContext
#define xf(width, name, var, subs, ...) do { \
uint32_t value = 0; \
uint32_t value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), \
&value, 0, (1 << width) - 1)); \
var = value; \
} while (0)
#define xs(width, name, var, subs, ...) do { \
int32_t value = 0; \
int32_t value; \
CHECK(cbs_vp9_read_s(ctx, rw, width, #name, \
SUBSCRIPTS(subs, __VA_ARGS__), &value)); \
var = value; \
@ -282,7 +282,7 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
#define increment(name, min, max) do { \
uint32_t value = 0; \
uint32_t value; \
CHECK(cbs_vp9_read_increment(ctx, rw, min, max, #name, &value)); \
current->name = value; \
} while (0)
@ -315,7 +315,7 @@ static int cbs_vp9_write_le(CodedBitstreamContext *ctx, PutBitContext *pbc,
} while (0)
#define fixed(width, name, value) do { \
av_unused uint32_t fixed_value = value; \
av_unused uint32_t fixed_value; \
CHECK(ff_cbs_read_unsigned(ctx, rw, width, #name, \
0, &fixed_value, value, value)); \
} while (0)