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Diffstat (limited to 'ffmpeg/libavcodec/h263.c')
-rw-r--r--ffmpeg/libavcodec/h263.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/h263.c b/ffmpeg/libavcodec/h263.c
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+++ b/ffmpeg/libavcodec/h263.c
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+/*
+ * H263/MPEG4 backend for encoder and decoder
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ * H263+ support.
+ * Copyright (c) 2001 Juan J. Sierralta P
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * h263/mpeg4 codec.
+ */
+
+//#define DEBUG
+#include <limits.h>
+
+#include "avcodec.h"
+#include "mpegvideo.h"
+#include "h263.h"
+#include "h263data.h"
+#include "mathops.h"
+#include "unary.h"
+#include "flv.h"
+#include "mpeg4video.h"
+
+//#undef NDEBUG
+//#include <assert.h>
+
+uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
+
+
+void ff_h263_update_motion_val(MpegEncContext * s){
+ const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
+ //FIXME a lot of that is only needed for !low_delay
+ const int wrap = s->b8_stride;
+ const int xy = s->block_index[0];
+
+ s->current_picture.mbskip_table[mb_xy] = s->mb_skipped;
+
+ if(s->mv_type != MV_TYPE_8X8){
+ int motion_x, motion_y;
+ if (s->mb_intra) {
+ motion_x = 0;
+ motion_y = 0;
+ } else if (s->mv_type == MV_TYPE_16X16) {
+ motion_x = s->mv[0][0][0];
+ motion_y = s->mv[0][0][1];
+ } else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
+ int i;
+ motion_x = s->mv[0][0][0] + s->mv[0][1][0];
+ motion_y = s->mv[0][0][1] + s->mv[0][1][1];
+ motion_x = (motion_x>>1) | (motion_x&1);
+ for(i=0; i<2; i++){
+ s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
+ s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
+ }
+ s->current_picture.ref_index[0][4*mb_xy ] =
+ s->current_picture.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];
+ s->current_picture.ref_index[0][4*mb_xy + 2] =
+ s->current_picture.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];
+ }
+
+ /* no update if 8X8 because it has been done during parsing */
+ s->current_picture.motion_val[0][xy][0] = motion_x;
+ s->current_picture.motion_val[0][xy][1] = motion_y;
+ s->current_picture.motion_val[0][xy + 1][0] = motion_x;
+ s->current_picture.motion_val[0][xy + 1][1] = motion_y;
+ s->current_picture.motion_val[0][xy + wrap][0] = motion_x;
+ s->current_picture.motion_val[0][xy + wrap][1] = motion_y;
+ s->current_picture.motion_val[0][xy + 1 + wrap][0] = motion_x;
+ s->current_picture.motion_val[0][xy + 1 + wrap][1] = motion_y;
+ }
+
+ if(s->encoding){ //FIXME encoding MUST be cleaned up
+ if (s->mv_type == MV_TYPE_8X8)
+ s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_8x8;
+ else if(s->mb_intra)
+ s->current_picture.mb_type[mb_xy] = MB_TYPE_INTRA;
+ else
+ s->current_picture.mb_type[mb_xy] = MB_TYPE_L0 | MB_TYPE_16x16;
+ }
+}
+
+int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr)
+{
+ int x, y, wrap, a, c, pred_dc;
+ int16_t *dc_val;
+
+ /* find prediction */
+ if (n < 4) {
+ x = 2 * s->mb_x + (n & 1);
+ y = 2 * s->mb_y + ((n & 2) >> 1);
+ wrap = s->b8_stride;
+ dc_val = s->dc_val[0];
+ } else {
+ x = s->mb_x;
+ y = s->mb_y;
+ wrap = s->mb_stride;
+ dc_val = s->dc_val[n - 4 + 1];
+ }
+ /* B C
+ * A X
+ */
+ a = dc_val[(x - 1) + (y) * wrap];
+ c = dc_val[(x) + (y - 1) * wrap];
+
+ /* No prediction outside GOB boundary */
+ if(s->first_slice_line && n!=3){
+ if(n!=2) c= 1024;
+ if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
+ }
+ /* just DC prediction */
+ if (a != 1024 && c != 1024)
+ pred_dc = (a + c) >> 1;
+ else if (a != 1024)
+ pred_dc = a;
+ else
+ pred_dc = c;
+
+ /* we assume pred is positive */
+ *dc_val_ptr = &dc_val[x + y * wrap];
+ return pred_dc;
+}
+
+void ff_h263_loop_filter(MpegEncContext * s){
+ int qp_c;
+ const int linesize = s->linesize;
+ const int uvlinesize= s->uvlinesize;
+ const int xy = s->mb_y * s->mb_stride + s->mb_x;
+ uint8_t *dest_y = s->dest[0];
+ uint8_t *dest_cb= s->dest[1];
+ uint8_t *dest_cr= s->dest[2];
+
+// if(s->pict_type==AV_PICTURE_TYPE_B && !s->readable) return;
+
+ /*
+ Diag Top
+ Left Center
+ */
+ if (!IS_SKIP(s->current_picture.mb_type[xy])) {
+ qp_c= s->qscale;
+ s->dsp.h263_v_loop_filter(dest_y+8*linesize , linesize, qp_c);
+ s->dsp.h263_v_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
+ }else
+ qp_c= 0;
+
+ if(s->mb_y){
+ int qp_dt, qp_tt, qp_tc;
+
+ if (IS_SKIP(s->current_picture.mb_type[xy - s->mb_stride]))
+ qp_tt=0;
+ else
+ qp_tt = s->current_picture.qscale_table[xy - s->mb_stride];
+
+ if(qp_c)
+ qp_tc= qp_c;
+ else
+ qp_tc= qp_tt;
+
+ if(qp_tc){
+ const int chroma_qp= s->chroma_qscale_table[qp_tc];
+ s->dsp.h263_v_loop_filter(dest_y , linesize, qp_tc);
+ s->dsp.h263_v_loop_filter(dest_y+8, linesize, qp_tc);
+
+ s->dsp.h263_v_loop_filter(dest_cb , uvlinesize, chroma_qp);
+ s->dsp.h263_v_loop_filter(dest_cr , uvlinesize, chroma_qp);
+ }
+
+ if(qp_tt)
+ s->dsp.h263_h_loop_filter(dest_y-8*linesize+8 , linesize, qp_tt);
+
+ if(s->mb_x){
+ if (qp_tt || IS_SKIP(s->current_picture.mb_type[xy - 1 - s->mb_stride]))
+ qp_dt= qp_tt;
+ else
+ qp_dt = s->current_picture.qscale_table[xy - 1 - s->mb_stride];
+
+ if(qp_dt){
+ const int chroma_qp= s->chroma_qscale_table[qp_dt];
+ s->dsp.h263_h_loop_filter(dest_y -8*linesize , linesize, qp_dt);
+ s->dsp.h263_h_loop_filter(dest_cb-8*uvlinesize, uvlinesize, chroma_qp);
+ s->dsp.h263_h_loop_filter(dest_cr-8*uvlinesize, uvlinesize, chroma_qp);
+ }
+ }
+ }
+
+ if(qp_c){
+ s->dsp.h263_h_loop_filter(dest_y +8, linesize, qp_c);
+ if(s->mb_y + 1 == s->mb_height)
+ s->dsp.h263_h_loop_filter(dest_y+8*linesize+8, linesize, qp_c);
+ }
+
+ if(s->mb_x){
+ int qp_lc;
+ if (qp_c || IS_SKIP(s->current_picture.mb_type[xy - 1]))
+ qp_lc= qp_c;
+ else
+ qp_lc = s->current_picture.qscale_table[xy - 1];
+
+ if(qp_lc){
+ s->dsp.h263_h_loop_filter(dest_y, linesize, qp_lc);
+ if(s->mb_y + 1 == s->mb_height){
+ const int chroma_qp= s->chroma_qscale_table[qp_lc];
+ s->dsp.h263_h_loop_filter(dest_y +8* linesize, linesize, qp_lc);
+ s->dsp.h263_h_loop_filter(dest_cb , uvlinesize, chroma_qp);
+ s->dsp.h263_h_loop_filter(dest_cr , uvlinesize, chroma_qp);
+ }
+ }
+ }
+}
+
+void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n)
+{
+ int x, y, wrap, a, c, pred_dc, scale, i;
+ int16_t *dc_val, *ac_val, *ac_val1;
+
+ /* find prediction */
+ if (n < 4) {
+ x = 2 * s->mb_x + (n & 1);
+ y = 2 * s->mb_y + (n>> 1);
+ wrap = s->b8_stride;
+ dc_val = s->dc_val[0];
+ ac_val = s->ac_val[0][0];
+ scale = s->y_dc_scale;
+ } else {
+ x = s->mb_x;
+ y = s->mb_y;
+ wrap = s->mb_stride;
+ dc_val = s->dc_val[n - 4 + 1];
+ ac_val = s->ac_val[n - 4 + 1][0];
+ scale = s->c_dc_scale;
+ }
+
+ ac_val += ((y) * wrap + (x)) * 16;
+ ac_val1 = ac_val;
+
+ /* B C
+ * A X
+ */
+ a = dc_val[(x - 1) + (y) * wrap];
+ c = dc_val[(x) + (y - 1) * wrap];
+
+ /* No prediction outside GOB boundary */
+ if(s->first_slice_line && n!=3){
+ if(n!=2) c= 1024;
+ if(n!=1 && s->mb_x == s->resync_mb_x) a= 1024;
+ }
+
+ if (s->ac_pred) {
+ pred_dc = 1024;
+ if (s->h263_aic_dir) {
+ /* left prediction */
+ if (a != 1024) {
+ ac_val -= 16;
+ for(i=1;i<8;i++) {
+ block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
+ }
+ pred_dc = a;
+ }
+ } else {
+ /* top prediction */
+ if (c != 1024) {
+ ac_val -= 16 * wrap;
+ for(i=1;i<8;i++) {
+ block[s->dsp.idct_permutation[i ]] += ac_val[i + 8];
+ }
+ pred_dc = c;
+ }
+ }
+ } else {
+ /* just DC prediction */
+ if (a != 1024 && c != 1024)
+ pred_dc = (a + c) >> 1;
+ else if (a != 1024)
+ pred_dc = a;
+ else
+ pred_dc = c;
+ }
+
+ /* we assume pred is positive */
+ block[0]=block[0]*scale + pred_dc;
+
+ if (block[0] < 0)
+ block[0] = 0;
+ else
+ block[0] |= 1;
+
+ /* Update AC/DC tables */
+ dc_val[(x) + (y) * wrap] = block[0];
+
+ /* left copy */
+ for(i=1;i<8;i++)
+ ac_val1[i ] = block[s->dsp.idct_permutation[i<<3]];
+ /* top copy */
+ for(i=1;i<8;i++)
+ ac_val1[8 + i] = block[s->dsp.idct_permutation[i ]];
+}
+
+int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
+ int *px, int *py)
+{
+ int wrap;
+ int16_t *A, *B, *C, (*mot_val)[2];
+ static const int off[4]= {2, 1, 1, -1};
+
+ wrap = s->b8_stride;
+ mot_val = s->current_picture.motion_val[dir] + s->block_index[block];
+
+ A = mot_val[ - 1];
+ /* special case for first (slice) line */
+ if (s->first_slice_line && block<3) {
+ // we can't just change some MVs to simulate that as we need them for the B frames (and ME)
+ // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
+ if(block==0){ //most common case
+ if(s->mb_x == s->resync_mb_x){ //rare
+ *px= *py = 0;
+ }else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
+ C = mot_val[off[block] - wrap];
+ if(s->mb_x==0){
+ *px = C[0];
+ *py = C[1];
+ }else{
+ *px = mid_pred(A[0], 0, C[0]);
+ *py = mid_pred(A[1], 0, C[1]);
+ }
+ }else{
+ *px = A[0];
+ *py = A[1];
+ }
+ }else if(block==1){
+ if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
+ C = mot_val[off[block] - wrap];
+ *px = mid_pred(A[0], 0, C[0]);
+ *py = mid_pred(A[1], 0, C[1]);
+ }else{
+ *px = A[0];
+ *py = A[1];
+ }
+ }else{ /* block==2*/
+ B = mot_val[ - wrap];
+ C = mot_val[off[block] - wrap];
+ if(s->mb_x == s->resync_mb_x) //rare
+ A[0]=A[1]=0;
+
+ *px = mid_pred(A[0], B[0], C[0]);
+ *py = mid_pred(A[1], B[1], C[1]);
+ }
+ } else {
+ B = mot_val[ - wrap];
+ C = mot_val[off[block] - wrap];
+ *px = mid_pred(A[0], B[0], C[0]);
+ *py = mid_pred(A[1], B[1], C[1]);
+ }
+ return *mot_val;
+}
+
+
+/**
+ * Get the GOB height based on picture height.
+ */
+int ff_h263_get_gob_height(MpegEncContext *s){
+ if (s->height <= 400)
+ return 1;
+ else if (s->height <= 800)
+ return 2;
+ else
+ return 4;
+}
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