videolan/ffmpeg
1
Fork 0
mirror of https://git.videolan.org/git/ffmpeg.git synced 2024-08-05 02:39:57 +02:00
Code Releases Activity

Avoid tracking i4x4 modes in P-frames in VP8

Browse Source 
As in the previous commit, they aren't used for context selection, so it saves
memory this way.

Originally committed as revision 24416 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jason Garrett-Glaser 2010-07-22 07:04:45 +00:00
parent 158e062c95
commit d1c58fce20
1 changed files with 20 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
libavcodec/vp8.c
View File

@ -109,6 +109,7 @@ typedef struct {
*/
DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
uint8_t intra4x4_pred_mode_mb[16];
int chroma_pred_mode; ///< 8x8c pred mode of the current macroblock
@ -670,19 +671,22 @@ static int decode_splitmvs(VP8Context *s, VP56RangeCoder *c,
static inline void decode_intra4x4_modes(VP56RangeCoder *c, uint8_t *intra4x4,
int stride, int keyframe)
{
int x, y, t, l;
const uint8_t *ctx = vp8_pred4x4_prob_inter;
int x, y, t, l, i;
for (y = 0; y < 4; y++) {
for (x = 0; x < 4; x++) {
if (keyframe) {
if (keyframe) {
const uint8_t *ctx;
for (y = 0; y < 4; y++) {
for (x = 0; x < 4; x++) {
t = intra4x4[x - stride];
l = intra4x4[x - 1];
ctx = vp8_pred4x4_prob_intra[t][l];
intra4x4[x] = vp8_rac_get_tree(c, vp8_pred4x4_tree, ctx);
}
intra4x4[x] = vp8_rac_get_tree(c, vp8_pred4x4_tree, ctx);
intra4x4 += stride;
}
intra4x4 += stride;
} else {
for (i = 0; i < 16; i++)
intra4x4[i] = vp8_rac_get_tree(c, vp8_pred4x4_tree, vp8_pred4x4_prob_inter);
}
}
@ -753,7 +757,7 @@ static void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_inter, s->prob->pred16x16);
if (mb->mode == MODE_I4x4)
decode_intra4x4_modes(c, intra4x4, s->b4_stride, 0);
decode_intra4x4_modes(c, intra4x4, 4, 0);
s->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree, s->prob->pred8x8c);
mb->ref_frame = VP56_FRAME_CURRENT;
@ -922,7 +926,7 @@ static int check_intra_pred_mode(int mode, int mb_x, int mb_y)
}
static void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
uint8_t *bmode, int mb_x, int mb_y)
uint8_t *intra4x4, int mb_x, int mb_y)
{
int x, y, mode, nnz, tr;
@ -938,6 +942,7 @@ static void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
s->hpc.pred16x16[mode](dst[0], s->linesize);
} else {
uint8_t *ptr = dst[0];
int stride = s->keyframe ? s->b4_stride : 4;
// all blocks on the right edge of the macroblock use bottom edge
// the top macroblock for their topright edge
@ -956,7 +961,7 @@ static void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
if (x == 3)
topright = tr_right;
s->hpc.pred4x4[bmode[x]](ptr+4*x, topright, s->linesize);
s->hpc.pred4x4[intra4x4[x]](ptr+4*x, topright, s->linesize);
nnz = s->non_zero_count_cache[y][x];
if (nnz) {
@ -969,7 +974,7 @@ static void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
}
ptr += 4*s->linesize;
bmode += s->b4_stride;
intra4x4 += stride;
}
}
@ -1457,11 +1462,13 @@ static int vp8_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
memset(s->top_border, 129, sizeof(*s->top_border));
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
uint8_t *intra4x4_mb = s->keyframe ? intra4x4 + 4*mb_x : s->intra4x4_pred_mode_mb;
/* Prefetch the current frame, 4 MBs ahead */
s->dsp.prefetch(dst[0] + (mb_x&3)*4*s->linesize + 64, s->linesize, 4);
s->dsp.prefetch(dst[1] + (mb_x&7)*s->uvlinesize + 64, dst[2] - dst[1], 2);
decode_mb_mode(s, mb, mb_x, mb_y, intra4x4 + 4*mb_x);
decode_mb_mode(s, mb, mb_x, mb_y, intra4x4_mb);
if (!mb->skip)
decode_mb_coeffs(s, c, mb, s->top_nnz[mb_x], s->left_nnz);
@ -1471,7 +1478,7 @@ static int vp8_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
}
if (mb->mode <= MODE_I4x4) {
intra_predict(s, dst, mb, intra4x4 + 4*mb_x, mb_x, mb_y);
intra_predict(s, dst, mb, intra4x4_mb, mb_x, mb_y);
memset(mb->bmv, 0, sizeof(mb->bmv));
} else {
inter_predict(s, dst, mb, mb_x, mb_y);