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optimize, merge offset bits in vlc code

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Originally committed as revision 13614 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Baptiste Coudurier 2008-06-02 03:07:32 +00:00
parent cb63a4b37c
commit 556eec43ef
1 changed files with 48 additions and 37 deletions
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85
libavcodec/dnxhdenc.c
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@ -67,7 +67,7 @@ typedef struct DNXHDEncContext {
unsigned frame_bits;
uint8_t *src[3];
uint16_t *table_vlc_codes;
uint32_t *table_vlc_codes;
uint8_t *table_vlc_bits;
uint16_t *table_run_codes;
uint8_t *table_run_bits;
@ -90,21 +90,47 @@ typedef struct DNXHDEncContext {
static int dnxhd_init_vlc(DNXHDEncContext *ctx)
{
int i;
int i, j, level, run;
int max_level = 1<<(ctx->cid_table->bit_depth+2);
CHECKED_ALLOCZ(ctx->table_vlc_codes, 449*2);
CHECKED_ALLOCZ(ctx->table_vlc_bits, 449);
CHECKED_ALLOCZ(ctx->table_run_codes, 63*2);
CHECKED_ALLOCZ(ctx->table_run_bits, 63);
CHECKED_ALLOCZ(ctx->table_vlc_codes, max_level*4*sizeof(*ctx->table_vlc_codes));
CHECKED_ALLOCZ(ctx->table_vlc_bits, max_level*4*sizeof(*ctx->table_vlc_bits));
CHECKED_ALLOCZ(ctx->table_run_codes, 63*2);
CHECKED_ALLOCZ(ctx->table_run_bits, 63);
for (i = 0; i < 257; i++) {
int level = ctx->cid_table->ac_level[i] +
(ctx->cid_table->ac_run_flag[i] << 7) + (ctx->cid_table->ac_index_flag[i] << 8);
assert(level < 449);
if (ctx->cid_table->ac_level[i] == 64 && ctx->cid_table->ac_index_flag[i])
level -= 64; // use 0+(1<<8) level
ctx->table_vlc_codes[level] = ctx->cid_table->ac_codes[i];
ctx->table_vlc_bits [level] = ctx->cid_table->ac_bits[i];
ctx->table_vlc_codes += max_level*2;
ctx->table_vlc_bits += max_level*2;
for (level = -max_level; level < max_level; level++) {
for (run = 0; run < 2; run++) {
int index = (level<<1)|run;
int sign, offset = 0, alevel = level;
MASK_ABS(sign, alevel);
if (alevel > 64) {
offset = (alevel-1)>>6;
alevel -= offset<<6;
}
for (j = 0; j < 257; j++) {
if (ctx->cid_table->ac_level[j] == alevel &&
(!offset || (ctx->cid_table->ac_index_flag[j] && offset)) &&
(!run || (ctx->cid_table->ac_run_flag [j] && run))) {
assert(!ctx->table_vlc_codes[index]);
if (alevel) {
ctx->table_vlc_codes[index] = (ctx->cid_table->ac_codes[j]<<1)|(sign&1);
ctx->table_vlc_bits [index] = ctx->cid_table->ac_bits[j]+1;
} else {
ctx->table_vlc_codes[index] = ctx->cid_table->ac_codes[j];
ctx->table_vlc_bits [index] = ctx->cid_table->ac_bits [j];
}
break;
}
}
assert(!alevel || j < 257);
if (offset) {
ctx->table_vlc_codes[index] = (ctx->table_vlc_codes[index]<<ctx->cid_table->index_bits)|offset;
ctx->table_vlc_bits [index]+= ctx->cid_table->index_bits;
}
}
}
for (i = 0; i < 62; i++) {
int run = ctx->cid_table->run[i];
@ -284,7 +310,6 @@ static av_always_inline void dnxhd_encode_dc(DNXHDEncContext *ctx, int diff)
static av_always_inline void dnxhd_encode_block(DNXHDEncContext *ctx, DCTELEM *block, int last_index, int n)
{
int last_non_zero = 0;
int offset = 0;
int slevel, i, j;
dnxhd_encode_dc(ctx, block[0] - ctx->m.last_dc[n]);
@ -295,19 +320,8 @@ static av_always_inline void dnxhd_encode_block(DNXHDEncContext *ctx, DCTELEM *b
slevel = block[j];
if (slevel) {
int run_level = i - last_non_zero - 1;
int sign;
MASK_ABS(sign, slevel);
if (slevel > 64) {
offset = (slevel-1) >> 6;
slevel = 256 | (slevel & 63); // level 64 is treated as 0
}
if (run_level)
slevel |= 128;
put_bits(&ctx->m.pb, ctx->table_vlc_bits[slevel]+1, (ctx->table_vlc_codes[slevel]<<1)|(sign&1));
if (offset) {
put_bits(&ctx->m.pb, 4, offset);
offset = 0;
}
int rlevel = (slevel<<1)|!!run_level;
put_bits(&ctx->m.pb, ctx->table_vlc_bits[rlevel], ctx->table_vlc_codes[rlevel]);
if (run_level)
put_bits(&ctx->m.pb, ctx->table_run_bits[run_level], ctx->table_run_codes[run_level]);
last_non_zero = i;
@ -364,13 +378,7 @@ static av_always_inline int dnxhd_calc_ac_bits(DNXHDEncContext *ctx, DCTELEM *bl
level = block[j];
if (level) {
int run_level = i - last_non_zero - 1;
level = FFABS(level);
if (level > 64) {
level = 256 | (level & 63); // level 64 is treated as 0
bits += 4;
}
level |= (!!run_level)<<7;
bits += ctx->table_vlc_bits[level]+1 + ctx->table_run_bits[run_level];
bits += ctx->table_vlc_bits[(level<<1)|!!run_level]+ctx->table_run_bits[run_level];
last_non_zero = i;
}
}
@ -512,7 +520,9 @@ static int dnxhd_encode_thread(AVCodecContext *avctx, void *arg)
int last_index, overflow;
int n = dnxhd_switch_matrix(ctx, i);
last_index = ctx->m.dct_quantize((MpegEncContext*)ctx, block, i, qscale, &overflow);
//START_TIMER;
dnxhd_encode_block(ctx, block, last_index, n);
//STOP_TIMER("encode_block");
}
}
if (put_bits_count(&ctx->m.pb)&31)
@ -813,10 +823,11 @@ static int dnxhd_encode_picture(AVCodecContext *avctx, unsigned char *buf, int b
static int dnxhd_encode_end(AVCodecContext *avctx)
{
DNXHDEncContext *ctx = avctx->priv_data;
int max_level = 1<<(ctx->cid_table->bit_depth+2);
int i;
av_freep(&ctx->table_vlc_codes);
av_freep(&ctx->table_vlc_bits);
av_free(ctx->table_vlc_codes-max_level*2);
av_free(ctx->table_vlc_bits -max_level*2);
av_freep(&ctx->table_run_codes);
av_freep(&ctx->table_run_bits);