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avcodec/cbs: Add specialization for ff_cbs_(read|write)_unsigned()

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These functions allow not only to read and write unsigned values,
but also to check ranges and to emit trace output which can be
beautified when processing arrays (indices like "[i]" are replaced
by their actual numbers).

Yet lots of callers actually only need something simpler:
Their range is only implicitly restricted by the amount
of bits used and they are not part of arrays, hence don't
need this beautification.

This commit adds specializations for these callers;
this is very beneficial size-wise (it reduced the size
of .text by 23312 bytes here), as a call is now cheaper.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt
2022-07-01 11:44:36 +02:00
parent b85557b231
commit a105b11a9d
6 changed files with 97 additions and 20 deletions
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34
libavcodec/cbs.c
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@@ -546,10 +546,13 @@ void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
position, name, pad, bits, value);
}
int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, uint32_t *write_to,
uint32_t range_min, uint32_t range_max)
static av_always_inline int cbs_read_unsigned(CodedBitstreamContext *ctx,
GetBitContext *gbc,
int width, const char *name,
const int *subscripts,
uint32_t *write_to,
uint32_t range_min,
uint32_t range_max)
{
uint32_t value;
int position;
@@ -589,6 +592,22 @@ int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
return 0;
}
int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, uint32_t *write_to,
uint32_t range_min, uint32_t range_max)
{
return cbs_read_unsigned(ctx, gbc, width, name, subscripts,
write_to, range_min, range_max);
}
int ff_cbs_read_simple_unsigned(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name, uint32_t *write_to)
{
return cbs_read_unsigned(ctx, gbc, width, name, NULL,
write_to, 0, UINT32_MAX);
}
int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name,
const int *subscripts, uint32_t value,
@@ -625,6 +644,13 @@ int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
return 0;
}
int ff_cbs_write_simple_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
int width, const char *name, uint32_t value)
{
return ff_cbs_write_unsigned(ctx, pbc, width, name, NULL,
value, 0, MAX_UINT_BITS(width));
}
int ff_cbs_read_signed(CodedBitstreamContext *ctx, GetBitContext *gbc,
int width, const char *name,
const int *subscripts, int32_t *write_to,