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h264: Don't store intra pcm samples in h->mb 

Instead, keep them in the bitstream buffer until we read them verbatim,
this saves a memcpy() and a subsequent clearing of the target buffer.
decode_cabac+decode_mb for a sample file (CAPM3_Sony_D.jsv) goes from
6121.4 to 6095.5 cycles, i.e. 26 cycles faster.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Ronald S. Bultje 2013-02-17 14:52:24 -08:00 committed by Martin Storsjö
parent 9918f57dcf
commit 7ebfb466ae
4 changed files with 21 additions and 23 deletions
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1
libavcodec/h264.h
View File

@ -416,6 +416,7 @@ typedef struct H264Context {
GetBitContext *intra_gb_ptr;
GetBitContext *inter_gb_ptr;
const uint8_t *intra_pcm_ptr;
DECLARE_ALIGNED(16, int16_t, mb)[16 * 48 * 2]; ///< as a dct coeffecient is int32_t in high depth, we need to reserve twice the space.
DECLARE_ALIGNED(16, int16_t, mb_luma_dc)[3][16 * 2];
int16_t mb_padding[256 * 2]; ///< as mb is addressed by scantable[i] and scantable is uint8_t we can either check that i is not too large or ensure that there is some unused stuff after mb

3
libavcodec/h264_cabac.c
View File

@ -2004,7 +2004,8 @@ decode_intra_mb:
// The pixels are stored in the same order as levels in h->mb array.
if ((int) (h->cabac.bytestream_end - ptr) < mb_size)
return -1;
memcpy(h->mb, ptr, mb_size); ptr+=mb_size;
h->intra_pcm_ptr = ptr;
ptr += mb_size;
ff_init_cabac_decoder(&h->cabac, ptr, h->cabac.bytestream_end - ptr);

11
libavcodec/h264_cavlc.c
View File

@ -761,17 +761,12 @@ decode_intra_mb:
h->slice_table[ mb_xy ]= h->slice_num;
if(IS_INTRA_PCM(mb_type)){
unsigned int x;
const int mb_size = ff_h264_mb_sizes[h->sps.chroma_format_idc] *
h->sps.bit_depth_luma >> 3;
h->sps.bit_depth_luma;
// We assume these blocks are very rare so we do not optimize it.
align_get_bits(&h->gb);
// The pixels are stored in the same order as levels in h->mb array.
for(x=0; x < mb_size; x++){
((uint8_t*)h->mb)[x]= get_bits(&h->gb, 8);
}
h->intra_pcm_ptr = align_get_bits(&h->gb);
skip_bits_long(&h->gb, mb_size);
// In deblocking, the quantizer is 0
h->cur_pic.f.qscale_table[mb_xy] = 0;

29
libavcodec/h264_mb_template.c
View File

@ -102,7 +102,7 @@ static av_noinline void FUNC(hl_decode_mb)(H264Context *h)
const int bit_depth = h->sps.bit_depth_luma;
int j;
GetBitContext gb;
init_get_bits(&gb, (uint8_t *)h->mb,
init_get_bits(&gb, (uint8_t *)h->intra_pcm_ptr,
ff_h264_mb_sizes[h->sps.chroma_format_idc] * bit_depth);
for (i = 0; i < 16; i++) {
@ -137,7 +137,7 @@ static av_noinline void FUNC(hl_decode_mb)(H264Context *h)
}
} else {
for (i = 0; i < 16; i++)
memcpy(dest_y + i * linesize, (uint8_t *)h->mb + i * 16, 16);
memcpy(dest_y + i * linesize, (uint8_t *)h->intra_pcm_ptr + i * 16, 16);
if (SIMPLE || !CONFIG_GRAY || !(h->flags & CODEC_FLAG_GRAY)) {
if (!h->sps.chroma_format_idc) {
for (i = 0; i < block_h; i++) {
@ -145,8 +145,8 @@ static av_noinline void FUNC(hl_decode_mb)(H264Context *h)
memset(dest_cr + i * uvlinesize, 128, 8);
}
} else {
uint8_t *src_cb = (uint8_t *)h->mb + 256;
uint8_t *src_cr = (uint8_t *)h->mb + 256 + block_h * 8;
uint8_t *src_cb = (uint8_t *)h->intra_pcm_ptr + 256;
uint8_t *src_cr = (uint8_t *)h->intra_pcm_ptr + 256 + block_h * 8;
for (i = 0; i < block_h; i++) {
memcpy(dest_cb + i * uvlinesize, src_cb + i * 8, 8);
memcpy(dest_cr + i * uvlinesize, src_cr + i * 8, 8);
@ -261,10 +261,10 @@ static av_noinline void FUNC(hl_decode_mb)(H264Context *h)
}
}
}
}
if (h->cbp || IS_INTRA(mb_type)) {
h->dsp.clear_blocks(h->mb);
h->dsp.clear_blocks(h->mb + (24 * 16 << PIXEL_SHIFT));
if (h->cbp || IS_INTRA(mb_type)) {
h->dsp.clear_blocks(h->mb);
h->dsp.clear_blocks(h->mb + (24 * 16 << PIXEL_SHIFT));
}
}
}
@ -328,7 +328,7 @@ static av_noinline void FUNC(hl_decode_mb_444)(H264Context *h)
if (PIXEL_SHIFT) {
const int bit_depth = h->sps.bit_depth_luma;
GetBitContext gb;
init_get_bits(&gb, (uint8_t *)h->mb, 768 * bit_depth);
init_get_bits(&gb, (uint8_t *)h->intra_pcm_ptr, 768 * bit_depth);
for (p = 0; p < plane_count; p++)
for (i = 0; i < 16; i++) {
@ -340,7 +340,7 @@ static av_noinline void FUNC(hl_decode_mb_444)(H264Context *h)
for (p = 0; p < plane_count; p++)
for (i = 0; i < 16; i++)
memcpy(dest[p] + i * linesize,
(uint8_t *)h->mb + p * 256 + i * 16, 16);
(uint8_t *)h->intra_pcm_ptr + p * 256 + i * 16, 16);
}
} else {
if (IS_INTRA(mb_type)) {
@ -368,10 +368,11 @@ static av_noinline void FUNC(hl_decode_mb_444)(H264Context *h)
hl_decode_mb_idct_luma(h, mb_type, 1, SIMPLE, transform_bypass,
PIXEL_SHIFT, block_offset, linesize,
dest[p], p);
}
if (h->cbp || IS_INTRA(mb_type)) {
h->dsp.clear_blocks(h->mb);
h->dsp.clear_blocks(h->mb + (24 * 16 << PIXEL_SHIFT));
if (h->cbp || IS_INTRA(mb_type)) {
h->dsp.clear_blocks(h->mb);
h->dsp.clear_blocks(h->mb + (24 * 16 << PIXEL_SHIFT));
}
}
}