mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2025-06-20 22:18:48 +08:00
Coalescing the un-weighting and de-quantization steps for faster
processing Originally committed as revision 14691 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
@ -50,7 +50,7 @@ typedef struct DVVideoContext {
|
|||||||
uint8_t *buf;
|
uint8_t *buf;
|
||||||
|
|
||||||
uint8_t dv_zigzag[2][64];
|
uint8_t dv_zigzag[2][64];
|
||||||
uint8_t dv_idct_shift[2][2][22][64];
|
uint32_t dv_idct_factor[2][2][22][64];
|
||||||
|
|
||||||
void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
|
void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
|
||||||
void (*fdct[2])(DCTELEM *block);
|
void (*fdct[2])(DCTELEM *block);
|
||||||
@ -84,25 +84,22 @@ static struct dv_vlc_pair {
|
|||||||
|
|
||||||
static void dv_build_unquantize_tables(DVVideoContext *s, uint8_t* perm)
|
static void dv_build_unquantize_tables(DVVideoContext *s, uint8_t* perm)
|
||||||
{
|
{
|
||||||
int i, q, j;
|
int i, q, a;
|
||||||
|
|
||||||
/* NOTE: max left shift is 6 */
|
/* NOTE: max left shift is 6 */
|
||||||
for(q = 0; q < 22; q++) {
|
for(q = 0; q < 22; q++) {
|
||||||
/* 88DCT */
|
/* 88DCT */
|
||||||
for(i = 1; i < 64; i++) {
|
i=1;
|
||||||
/* 88 table */
|
for(a = 0; a<4; a++) {
|
||||||
j = perm[i];
|
for(; i < dv_quant_areas[a]; i++) {
|
||||||
s->dv_idct_shift[0][0][q][j] =
|
/* 88 table */
|
||||||
dv_quant_shifts[q][dv_88_areas[i]] + 1;
|
s->dv_idct_factor[0][0][q][i] = dv_iweight_88[i]<<(dv_quant_shifts[q][a] + 1);
|
||||||
s->dv_idct_shift[1][0][q][j] = s->dv_idct_shift[0][0][q][j] + 1;
|
s->dv_idct_factor[1][0][q][i] = s->dv_idct_factor[0][0][q][i]<<1;
|
||||||
}
|
|
||||||
|
|
||||||
/* 248DCT */
|
/* 248 table */
|
||||||
for(i = 1; i < 64; i++) {
|
s->dv_idct_factor[0][1][q][i] = dv_iweight_248[i]<<(dv_quant_shifts[q][a] + 1);
|
||||||
/* 248 table */
|
s->dv_idct_factor[1][1][q][i] = s->dv_idct_factor[0][1][q][i]<<1;
|
||||||
s->dv_idct_shift[0][1][q][i] =
|
}
|
||||||
dv_quant_shifts[q][dv_248_areas[i]] + 1;
|
|
||||||
s->dv_idct_shift[1][1][q][i] = s->dv_idct_shift[0][1][q][i] + 1;
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
@ -247,9 +244,8 @@ static av_cold int dvvideo_init(AVCodecContext *avctx)
|
|||||||
// #define printf(...) av_log(NULL, AV_LOG_ERROR, __VA_ARGS__)
|
// #define printf(...) av_log(NULL, AV_LOG_ERROR, __VA_ARGS__)
|
||||||
|
|
||||||
typedef struct BlockInfo {
|
typedef struct BlockInfo {
|
||||||
const uint8_t *shift_table;
|
const uint32_t *factor_table;
|
||||||
const uint8_t *scan_table;
|
const uint8_t *scan_table;
|
||||||
const int *iweight_table;
|
|
||||||
uint8_t pos; /* position in block */
|
uint8_t pos; /* position in block */
|
||||||
uint8_t dct_mode;
|
uint8_t dct_mode;
|
||||||
uint8_t partial_bit_count;
|
uint8_t partial_bit_count;
|
||||||
@ -281,11 +277,10 @@ static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)
|
|||||||
{
|
{
|
||||||
int last_index = gb->size_in_bits;
|
int last_index = gb->size_in_bits;
|
||||||
const uint8_t *scan_table = mb->scan_table;
|
const uint8_t *scan_table = mb->scan_table;
|
||||||
const uint8_t *shift_table = mb->shift_table;
|
const uint32_t *factor_table = mb->factor_table;
|
||||||
const int *iweight_table = mb->iweight_table;
|
|
||||||
int pos = mb->pos;
|
int pos = mb->pos;
|
||||||
int partial_bit_count = mb->partial_bit_count;
|
int partial_bit_count = mb->partial_bit_count;
|
||||||
int level, pos1, run, vlc_len, index;
|
int level, run, vlc_len, index;
|
||||||
|
|
||||||
OPEN_READER(re, gb);
|
OPEN_READER(re, gb);
|
||||||
UPDATE_CACHE(re, gb);
|
UPDATE_CACHE(re, gb);
|
||||||
@ -330,13 +325,8 @@ static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)
|
|||||||
if (pos >= 64)
|
if (pos >= 64)
|
||||||
break;
|
break;
|
||||||
|
|
||||||
pos1 = scan_table[pos];
|
level = (level*factor_table[pos] + (1 << (dv_iweight_bits-1))) >> dv_iweight_bits;
|
||||||
level <<= shift_table[pos1];
|
block[scan_table[pos]] = level;
|
||||||
|
|
||||||
/* unweigh, round, and shift down */
|
|
||||||
level = (level*iweight_table[pos] + (1 << (dv_iweight_bits-1))) >> dv_iweight_bits;
|
|
||||||
|
|
||||||
block[pos1] = level;
|
|
||||||
|
|
||||||
UPDATE_CACHE(re, gb);
|
UPDATE_CACHE(re, gb);
|
||||||
}
|
}
|
||||||
@ -402,9 +392,8 @@ static inline void dv_decode_video_segment(DVVideoContext *s,
|
|||||||
dct_mode = get_bits1(&gb);
|
dct_mode = get_bits1(&gb);
|
||||||
mb->dct_mode = dct_mode;
|
mb->dct_mode = dct_mode;
|
||||||
mb->scan_table = s->dv_zigzag[dct_mode];
|
mb->scan_table = s->dv_zigzag[dct_mode];
|
||||||
mb->iweight_table = dct_mode ? dv_iweight_248 : dv_iweight_88;
|
|
||||||
class1 = get_bits(&gb, 2);
|
class1 = get_bits(&gb, 2);
|
||||||
mb->shift_table = s->dv_idct_shift[class1 == 3][dct_mode]
|
mb->factor_table = s->dv_idct_factor[class1 == 3][dct_mode]
|
||||||
[quant + dv_quant_offset[class1]];
|
[quant + dv_quant_offset[class1]];
|
||||||
dc = dc << 2;
|
dc = dc << 2;
|
||||||
/* convert to unsigned because 128 is not added in the
|
/* convert to unsigned because 128 is not added in the
|
||||||
|
@ -286,28 +286,6 @@ static const uint8_t dv_vlc_level[409] = {
|
|||||||
};
|
};
|
||||||
|
|
||||||
/* unquant tables (not used directly) */
|
/* unquant tables (not used directly) */
|
||||||
static const uint8_t dv_88_areas[64] = {
|
|
||||||
0,0,0,1,1,1,2,2,
|
|
||||||
0,0,1,1,1,2,2,2,
|
|
||||||
0,1,1,1,2,2,2,3,
|
|
||||||
1,1,1,2,2,2,3,3,
|
|
||||||
1,1,2,2,2,3,3,3,
|
|
||||||
1,2,2,2,3,3,3,3,
|
|
||||||
2,2,2,3,3,3,3,3,
|
|
||||||
2,2,3,3,3,3,3,3,
|
|
||||||
};
|
|
||||||
|
|
||||||
static const uint8_t dv_248_areas[64] = {
|
|
||||||
0,0,1,1,1,2,2,3,
|
|
||||||
0,0,1,1,2,2,2,3,
|
|
||||||
0,1,1,2,2,2,3,3,
|
|
||||||
0,1,1,2,2,2,3,3,
|
|
||||||
1,1,2,2,2,3,3,3,
|
|
||||||
1,1,2,2,2,3,3,3,
|
|
||||||
1,2,2,2,3,3,3,3,
|
|
||||||
1,2,2,3,3,3,3,3,
|
|
||||||
};
|
|
||||||
|
|
||||||
static const uint8_t dv_quant_shifts[22][4] = {
|
static const uint8_t dv_quant_shifts[22][4] = {
|
||||||
{ 3,3,4,4 },
|
{ 3,3,4,4 },
|
||||||
{ 3,3,4,4 },
|
{ 3,3,4,4 },
|
||||||
@ -334,6 +312,7 @@ static const uint8_t dv_quant_shifts[22][4] = {
|
|||||||
};
|
};
|
||||||
|
|
||||||
static const uint8_t dv_quant_offset[4] = { 6, 3, 0, 1 };
|
static const uint8_t dv_quant_offset[4] = { 6, 3, 0, 1 };
|
||||||
|
static const uint8_t dv_quant_areas[4] = { 6, 21, 43, 64 };
|
||||||
|
|
||||||
/* NOTE: I prefer hardcoding the positioning of dv blocks, it is
|
/* NOTE: I prefer hardcoding the positioning of dv blocks, it is
|
||||||
simpler :-) */
|
simpler :-) */
|
||||||
|
Reference in New Issue
Block a user