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dnxhddec: optimise dnxhd_decode_dct_block() 

Template the function for 8/10-bit and use lowlevel bitstream
macros.

6% faster overall on i7 gcc 4.5.

Signed-off-by: Mans Rullgard <mans@mansr.com>
tags/n0.9
Mans Rullgard 14 years ago
parent
4cc843facd
commit
bb32fded36
1 changed files with 67 additions and 37 deletions
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  1. +67
    -37
      libavcodec/dnxhddec.c

+ 67
- 37
libavcodec/dnxhddec.c View File

@@ -31,7 +31,7 @@
#include "dnxhddata.h"
#include "dsputil.h"

typedef struct {
typedef struct DNXHDContext {
AVCodecContext *avctx;
AVFrame picture;
GetBitContext gb;
@@ -47,11 +47,16 @@ typedef struct {
ScanTable scantable;
const CIDEntry *cid_table;
int bit_depth; // 8, 10 or 0 if not initialized at all.
void (*decode_dct_block)(struct DNXHDContext *ctx, DCTELEM *block,
int n, int qscale);
} DNXHDContext;

#define DNXHD_VLC_BITS 9
#define DNXHD_DC_VLC_BITS 7

static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);
static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block, int n, int qscale);

static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
{
DNXHDContext *ctx = avctx->priv_data;
@@ -118,6 +123,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_si
if (ctx->bit_depth != 10) {
dsputil_init(&ctx->dsp, ctx->avctx);
ctx->bit_depth = 10;
ctx->decode_dct_block = dnxhd_decode_dct_block_10;
}
} else {
ctx->avctx->pix_fmt = PIX_FMT_YUV422P;
@@ -125,6 +131,7 @@ static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_si
if (ctx->bit_depth != 8) {
dsputil_init(&ctx->dsp, ctx->avctx);
ctx->bit_depth = 8;
ctx->decode_dct_block = dnxhd_decode_dct_block_8;
}
}

@@ -165,71 +172,94 @@ static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_si
return 0;
}

static int dnxhd_decode_dc(DNXHDContext *ctx)
{
int len;

len = get_vlc2(&ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
return len ? get_xbits(&ctx->gb, len) : 0;
}

static void dnxhd_decode_dct_block(DNXHDContext *ctx, DCTELEM *block, int n, int qscale)
static av_always_inline void dnxhd_decode_dct_block(DNXHDContext *ctx,
DCTELEM *block, int n,
int qscale,
int index_bits,
int level_bias,
int level_shift)
{
int i, j, index, index2;
int i, j, index1, index2, len;
int level, component, sign;
const uint8_t *weigth_matrix;
const uint8_t *weight_matrix;
OPEN_READER(bs, &ctx->gb);

if (n&2) {
component = 1 + (n&1);
weigth_matrix = ctx->cid_table->chroma_weight;
weight_matrix = ctx->cid_table->chroma_weight;
} else {
component = 0;
weigth_matrix = ctx->cid_table->luma_weight;
weight_matrix = ctx->cid_table->luma_weight;
}

ctx->last_dc[component] += dnxhd_decode_dc(ctx);
UPDATE_CACHE(bs, &ctx->gb);
GET_VLC(len, bs, &ctx->gb, ctx->dc_vlc.table, DNXHD_DC_VLC_BITS, 1);
if (len) {
level = GET_CACHE(bs, &ctx->gb);
LAST_SKIP_BITS(bs, &ctx->gb, len);
sign = ~level >> 31;
level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
ctx->last_dc[component] += level;
}
block[0] = ctx->last_dc[component];
//av_log(ctx->avctx, AV_LOG_DEBUG, "dc %d\n", block[0]);

for (i = 1; ; i++) {
index = get_vlc2(&ctx->gb, ctx->ac_vlc.table, DNXHD_VLC_BITS, 2);
//av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index);
level = ctx->cid_table->ac_level[index];
UPDATE_CACHE(bs, &ctx->gb);
GET_VLC(index1, bs, &ctx->gb, ctx->ac_vlc.table,
DNXHD_VLC_BITS, 2);
//av_log(ctx->avctx, AV_LOG_DEBUG, "index %d\n", index1);
level = ctx->cid_table->ac_level[index1];
if (!level) { /* EOB */
//av_log(ctx->avctx, AV_LOG_DEBUG, "EOB\n");
return;
break;
}
sign = get_sbits(&ctx->gb, 1);

if (ctx->cid_table->ac_index_flag[index]) {
level += get_bits(&ctx->gb, ctx->cid_table->index_bits)<<6;
sign = SHOW_SBITS(bs, &ctx->gb, 1);
SKIP_BITS(bs, &ctx->gb, 1);

if (ctx->cid_table->ac_index_flag[index1]) {
level += SHOW_UBITS(bs, &ctx->gb, index_bits) << 6;
SKIP_BITS(bs, &ctx->gb, index_bits);
}

if (ctx->cid_table->ac_run_flag[index]) {
index2 = get_vlc2(&ctx->gb, ctx->run_vlc.table, DNXHD_VLC_BITS, 2);
if (ctx->cid_table->ac_run_flag[index1]) {
UPDATE_CACHE(bs, &ctx->gb);
GET_VLC(index2, bs, &ctx->gb, ctx->run_vlc.table,
DNXHD_VLC_BITS, 2);
i += ctx->cid_table->run[index2];
}

if (i > 63) {
av_log(ctx->avctx, AV_LOG_ERROR, "ac tex damaged %d, %d\n", n, i);
return;
break;
}

j = ctx->scantable.permutated[i];
//av_log(ctx->avctx, AV_LOG_DEBUG, "j %d\n", j);
//av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weigth %d\n", level, weigth_matrix[i]);
level = (2*level+1) * qscale * weigth_matrix[i];
if (ctx->bit_depth == 10) {
if (weigth_matrix[i] != 8)
level += 8;
level >>= 4;
} else {
if (weigth_matrix[i] != 32)
level += 32;
level >>= 6;
}
//av_log(ctx->avctx, AV_LOG_DEBUG, "level %d, weight %d\n", level, weight_matrix[i]);
level = (2*level+1) * qscale * weight_matrix[i];
if (weight_matrix[i] != level_bias)
level += level_bias;
level >>= level_shift;

//av_log(NULL, AV_LOG_DEBUG, "i %d, j %d, end level %d\n", i, j, level);
block[j] = (level^sign) - sign;
}

CLOSE_READER(bs, &ctx->gb);
}

static void dnxhd_decode_dct_block_8(DNXHDContext *ctx, DCTELEM *block,
int n, int qscale)
{
dnxhd_decode_dct_block(ctx, block, n, qscale, 4, 32, 6);
}

static void dnxhd_decode_dct_block_10(DNXHDContext *ctx, DCTELEM *block,
int n, int qscale)
{
dnxhd_decode_dct_block(ctx, block, n, qscale, 6, 8, 4);
}

static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)
@@ -247,7 +277,7 @@ static int dnxhd_decode_macroblock(DNXHDContext *ctx, int x, int y)

for (i = 0; i < 8; i++) {
ctx->dsp.clear_block(ctx->blocks[i]);
dnxhd_decode_dct_block(ctx, ctx->blocks[i], i, qscale);
ctx->decode_dct_block(ctx, ctx->blocks[i], i, qscale);
}

if (ctx->picture.interlaced_frame) {


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