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authorMichael Niedermayer <michaelni@gmx.at>2010-01-07 23:53:49 +0000
committerMichael Niedermayer <michaelni@gmx.at>2010-01-07 23:53:49 +0000
commitca334dd14b957c4af7fcab5e97b6ed675c97caad (patch)
treedd6bfecae0337a32bf00ca80a08dd33d2a8299f8 /libavcodec/mpeg4videodec.c
parent84f0aba18dc8815c5cd408238909e4dc8b60684f (diff)
Split the mpeg4 encoder and decoder off h263.c
Originally committed as revision 21079 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/mpeg4videodec.c')
-rw-r--r--libavcodec/mpeg4videodec.c2262
1 files changed, 2262 insertions, 0 deletions
diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c
new file mode 100644
index 0000000000..c0c565c7cb
--- /dev/null
+++ b/libavcodec/mpeg4videodec.c
@@ -0,0 +1,2262 @@
+/*
+ * MPEG4 decoder.
+ * Copyright (c) 2000,2001 Fabrice Bellard
+ * Copyright (c) 2002-2010 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
+ */
+
+#include "mpegvideo.h"
+#include "mpeg4video.h"
+#include "h263.h"
+
+// The defines below define the number of bits that are read at once for
+// reading vlc values. Changing these may improve speed and data cache needs
+// be aware though that decreasing them may need the number of stages that is
+// passed to get_vlc* to be increased.
+#define SPRITE_TRAJ_VLC_BITS 6
+#define DC_VLC_BITS 9
+#define MB_TYPE_B_VLC_BITS 4
+
+
+static VLC dc_lum, dc_chrom;
+static VLC sprite_trajectory;
+static VLC mb_type_b_vlc;
+
+static const int mb_type_b_map[4]= {
+ MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
+ MB_TYPE_L0L1 | MB_TYPE_16x16,
+ MB_TYPE_L1 | MB_TYPE_16x16,
+ MB_TYPE_L0 | MB_TYPE_16x16,
+};
+
+/**
+ * predicts the ac.
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ * @param dir the ac prediction direction
+ */
+void mpeg4_pred_ac(MpegEncContext * s, DCTELEM *block, int n,
+ int dir)
+{
+ int i;
+ int16_t *ac_val, *ac_val1;
+ int8_t * const qscale_table= s->current_picture.qscale_table;
+
+ /* find prediction */
+ ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
+ ac_val1 = ac_val;
+ if (s->ac_pred) {
+ if (dir == 0) {
+ const int xy= s->mb_x-1 + s->mb_y*s->mb_stride;
+ /* left prediction */
+ ac_val -= 16;
+
+ if(s->mb_x==0 || s->qscale == qscale_table[xy] || n==1 || n==3){
+ /* same qscale */
+ for(i=1;i<8;i++) {
+ block[s->dsp.idct_permutation[i<<3]] += ac_val[i];
+ }
+ }else{
+ /* different qscale, we must rescale */
+ for(i=1;i<8;i++) {
+ block[s->dsp.idct_permutation[i<<3]] += ROUNDED_DIV(ac_val[i]*qscale_table[xy], s->qscale);
+ }
+ }
+ } else {
+ const int xy= s->mb_x + s->mb_y*s->mb_stride - s->mb_stride;
+ /* top prediction */
+ ac_val -= 16 * s->block_wrap[n];
+
+ if(s->mb_y==0 || s->qscale == qscale_table[xy] || n==2 || n==3){
+ /* same qscale */
+ for(i=1;i<8;i++) {
+ block[s->dsp.idct_permutation[i]] += ac_val[i + 8];
+ }
+ }else{
+ /* different qscale, we must rescale */
+ for(i=1;i<8;i++) {
+ block[s->dsp.idct_permutation[i]] += ROUNDED_DIV(ac_val[i + 8]*qscale_table[xy], s->qscale);
+ }
+ }
+ }
+ }
+ /* 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 ]];
+
+}
+
+/**
+ * check if the next stuff is a resync marker or the end.
+ * @return 0 if not
+ */
+static inline int mpeg4_is_resync(MpegEncContext *s){
+ int bits_count= get_bits_count(&s->gb);
+ int v= show_bits(&s->gb, 16);
+
+ if(s->workaround_bugs&FF_BUG_NO_PADDING){
+ return 0;
+ }
+
+ while(v<=0xFF){
+ if(s->pict_type==FF_B_TYPE || (v>>(8-s->pict_type)!=1) || s->partitioned_frame)
+ break;
+ skip_bits(&s->gb, 8+s->pict_type);
+ bits_count+= 8+s->pict_type;
+ v= show_bits(&s->gb, 16);
+ }
+
+ if(bits_count + 8 >= s->gb.size_in_bits){
+ v>>=8;
+ v|= 0x7F >> (7-(bits_count&7));
+
+ if(v==0x7F)
+ return 1;
+ }else{
+ if(v == ff_mpeg4_resync_prefix[bits_count&7]){
+ int len;
+ GetBitContext gb= s->gb;
+
+ skip_bits(&s->gb, 1);
+ align_get_bits(&s->gb);
+
+ for(len=0; len<32; len++){
+ if(get_bits1(&s->gb)) break;
+ }
+
+ s->gb= gb;
+
+ if(len>=ff_mpeg4_get_video_packet_prefix_length(s))
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void mpeg4_decode_sprite_trajectory(MpegEncContext * s, GetBitContext *gb)
+{
+ int i;
+ int a= 2<<s->sprite_warping_accuracy;
+ int rho= 3-s->sprite_warping_accuracy;
+ int r=16/a;
+ const int vop_ref[4][2]= {{0,0}, {s->width,0}, {0, s->height}, {s->width, s->height}}; // only true for rectangle shapes
+ int d[4][2]={{0,0}, {0,0}, {0,0}, {0,0}};
+ int sprite_ref[4][2];
+ int virtual_ref[2][2];
+ int w2, h2, w3, h3;
+ int alpha=0, beta=0;
+ int w= s->width;
+ int h= s->height;
+ int min_ab;
+
+ for(i=0; i<s->num_sprite_warping_points; i++){
+ int length;
+ int x=0, y=0;
+
+ length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
+ if(length){
+ x= get_xbits(gb, length);
+ }
+ if(!(s->divx_version==500 && s->divx_build==413)) skip_bits1(gb); /* marker bit */
+
+ length= get_vlc2(gb, sprite_trajectory.table, SPRITE_TRAJ_VLC_BITS, 3);
+ if(length){
+ y=get_xbits(gb, length);
+ }
+ skip_bits1(gb); /* marker bit */
+ s->sprite_traj[i][0]= d[i][0]= x;
+ s->sprite_traj[i][1]= d[i][1]= y;
+ }
+ for(; i<4; i++)
+ s->sprite_traj[i][0]= s->sprite_traj[i][1]= 0;
+
+ while((1<<alpha)<w) alpha++;
+ while((1<<beta )<h) beta++; // there seems to be a typo in the mpeg4 std for the definition of w' and h'
+ w2= 1<<alpha;
+ h2= 1<<beta;
+
+// Note, the 4th point isn't used for GMC
+ if(s->divx_version==500 && s->divx_build==413){
+ sprite_ref[0][0]= a*vop_ref[0][0] + d[0][0];
+ sprite_ref[0][1]= a*vop_ref[0][1] + d[0][1];
+ sprite_ref[1][0]= a*vop_ref[1][0] + d[0][0] + d[1][0];
+ sprite_ref[1][1]= a*vop_ref[1][1] + d[0][1] + d[1][1];
+ sprite_ref[2][0]= a*vop_ref[2][0] + d[0][0] + d[2][0];
+ sprite_ref[2][1]= a*vop_ref[2][1] + d[0][1] + d[2][1];
+ } else {
+ sprite_ref[0][0]= (a>>1)*(2*vop_ref[0][0] + d[0][0]);
+ sprite_ref[0][1]= (a>>1)*(2*vop_ref[0][1] + d[0][1]);
+ sprite_ref[1][0]= (a>>1)*(2*vop_ref[1][0] + d[0][0] + d[1][0]);
+ sprite_ref[1][1]= (a>>1)*(2*vop_ref[1][1] + d[0][1] + d[1][1]);
+ sprite_ref[2][0]= (a>>1)*(2*vop_ref[2][0] + d[0][0] + d[2][0]);
+ sprite_ref[2][1]= (a>>1)*(2*vop_ref[2][1] + d[0][1] + d[2][1]);
+ }
+/* sprite_ref[3][0]= (a>>1)*(2*vop_ref[3][0] + d[0][0] + d[1][0] + d[2][0] + d[3][0]);
+ sprite_ref[3][1]= (a>>1)*(2*vop_ref[3][1] + d[0][1] + d[1][1] + d[2][1] + d[3][1]); */
+
+// this is mostly identical to the mpeg4 std (and is totally unreadable because of that ...)
+// perhaps it should be reordered to be more readable ...
+// the idea behind this virtual_ref mess is to be able to use shifts later per pixel instead of divides
+// so the distance between points is converted from w&h based to w2&h2 based which are of the 2^x form
+ virtual_ref[0][0]= 16*(vop_ref[0][0] + w2)
+ + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + w2*(r*sprite_ref[1][0] - 16*vop_ref[1][0])),w);
+ virtual_ref[0][1]= 16*vop_ref[0][1]
+ + ROUNDED_DIV(((w - w2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + w2*(r*sprite_ref[1][1] - 16*vop_ref[1][1])),w);
+ virtual_ref[1][0]= 16*vop_ref[0][0]
+ + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][0] - 16*vop_ref[0][0]) + h2*(r*sprite_ref[2][0] - 16*vop_ref[2][0])),h);
+ virtual_ref[1][1]= 16*(vop_ref[0][1] + h2)
+ + ROUNDED_DIV(((h - h2)*(r*sprite_ref[0][1] - 16*vop_ref[0][1]) + h2*(r*sprite_ref[2][1] - 16*vop_ref[2][1])),h);
+
+ switch(s->num_sprite_warping_points)
+ {
+ case 0:
+ s->sprite_offset[0][0]= 0;
+ s->sprite_offset[0][1]= 0;
+ s->sprite_offset[1][0]= 0;
+ s->sprite_offset[1][1]= 0;
+ s->sprite_delta[0][0]= a;
+ s->sprite_delta[0][1]= 0;
+ s->sprite_delta[1][0]= 0;
+ s->sprite_delta[1][1]= a;
+ s->sprite_shift[0]= 0;
+ s->sprite_shift[1]= 0;
+ break;
+ case 1: //GMC only
+ s->sprite_offset[0][0]= sprite_ref[0][0] - a*vop_ref[0][0];
+ s->sprite_offset[0][1]= sprite_ref[0][1] - a*vop_ref[0][1];
+ s->sprite_offset[1][0]= ((sprite_ref[0][0]>>1)|(sprite_ref[0][0]&1)) - a*(vop_ref[0][0]/2);
+ s->sprite_offset[1][1]= ((sprite_ref[0][1]>>1)|(sprite_ref[0][1]&1)) - a*(vop_ref[0][1]/2);
+ s->sprite_delta[0][0]= a;
+ s->sprite_delta[0][1]= 0;
+ s->sprite_delta[1][0]= 0;
+ s->sprite_delta[1][1]= a;
+ s->sprite_shift[0]= 0;
+ s->sprite_shift[1]= 0;
+ break;
+ case 2:
+ s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+rho))
+ + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][0])
+ + ( r*sprite_ref[0][1] - virtual_ref[0][1])*(-vop_ref[0][1])
+ + (1<<(alpha+rho-1));
+ s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+rho))
+ + (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-vop_ref[0][0])
+ + (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-vop_ref[0][1])
+ + (1<<(alpha+rho-1));
+ s->sprite_offset[1][0]= ( (-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][0] + 1)
+ +( r*sprite_ref[0][1] - virtual_ref[0][1])*(-2*vop_ref[0][1] + 1)
+ +2*w2*r*sprite_ref[0][0]
+ - 16*w2
+ + (1<<(alpha+rho+1)));
+ s->sprite_offset[1][1]= ( (-r*sprite_ref[0][1] + virtual_ref[0][1])*(-2*vop_ref[0][0] + 1)
+ +(-r*sprite_ref[0][0] + virtual_ref[0][0])*(-2*vop_ref[0][1] + 1)
+ +2*w2*r*sprite_ref[0][1]
+ - 16*w2
+ + (1<<(alpha+rho+1)));
+ s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
+ s->sprite_delta[0][1]= (+r*sprite_ref[0][1] - virtual_ref[0][1]);
+ s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1]);
+ s->sprite_delta[1][1]= (-r*sprite_ref[0][0] + virtual_ref[0][0]);
+
+ s->sprite_shift[0]= alpha+rho;
+ s->sprite_shift[1]= alpha+rho+2;
+ break;
+ case 3:
+ min_ab= FFMIN(alpha, beta);
+ w3= w2>>min_ab;
+ h3= h2>>min_ab;
+ s->sprite_offset[0][0]= (sprite_ref[0][0]<<(alpha+beta+rho-min_ab))
+ + (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-vop_ref[0][0])
+ + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-vop_ref[0][1])
+ + (1<<(alpha+beta+rho-min_ab-1));
+ s->sprite_offset[0][1]= (sprite_ref[0][1]<<(alpha+beta+rho-min_ab))
+ + (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-vop_ref[0][0])
+ + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-vop_ref[0][1])
+ + (1<<(alpha+beta+rho-min_ab-1));
+ s->sprite_offset[1][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3*(-2*vop_ref[0][0] + 1)
+ + (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3*(-2*vop_ref[0][1] + 1)
+ + 2*w2*h3*r*sprite_ref[0][0]
+ - 16*w2*h3
+ + (1<<(alpha+beta+rho-min_ab+1));
+ s->sprite_offset[1][1]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3*(-2*vop_ref[0][0] + 1)
+ + (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3*(-2*vop_ref[0][1] + 1)
+ + 2*w2*h3*r*sprite_ref[0][1]
+ - 16*w2*h3
+ + (1<<(alpha+beta+rho-min_ab+1));
+ s->sprite_delta[0][0]= (-r*sprite_ref[0][0] + virtual_ref[0][0])*h3;
+ s->sprite_delta[0][1]= (-r*sprite_ref[0][0] + virtual_ref[1][0])*w3;
+ s->sprite_delta[1][0]= (-r*sprite_ref[0][1] + virtual_ref[0][1])*h3;
+ s->sprite_delta[1][1]= (-r*sprite_ref[0][1] + virtual_ref[1][1])*w3;
+
+ s->sprite_shift[0]= alpha + beta + rho - min_ab;
+ s->sprite_shift[1]= alpha + beta + rho - min_ab + 2;
+ break;
+ }
+ /* try to simplify the situation */
+ if( s->sprite_delta[0][0] == a<<s->sprite_shift[0]
+ && s->sprite_delta[0][1] == 0
+ && s->sprite_delta[1][0] == 0
+ && s->sprite_delta[1][1] == a<<s->sprite_shift[0])
+ {
+ s->sprite_offset[0][0]>>=s->sprite_shift[0];
+ s->sprite_offset[0][1]>>=s->sprite_shift[0];
+ s->sprite_offset[1][0]>>=s->sprite_shift[1];
+ s->sprite_offset[1][1]>>=s->sprite_shift[1];
+ s->sprite_delta[0][0]= a;
+ s->sprite_delta[0][1]= 0;
+ s->sprite_delta[1][0]= 0;
+ s->sprite_delta[1][1]= a;
+ s->sprite_shift[0]= 0;
+ s->sprite_shift[1]= 0;
+ s->real_sprite_warping_points=1;
+ }
+ else{
+ int shift_y= 16 - s->sprite_shift[0];
+ int shift_c= 16 - s->sprite_shift[1];
+ for(i=0; i<2; i++){
+ s->sprite_offset[0][i]<<= shift_y;
+ s->sprite_offset[1][i]<<= shift_c;
+ s->sprite_delta[0][i]<<= shift_y;
+ s->sprite_delta[1][i]<<= shift_y;
+ s->sprite_shift[i]= 16;
+ }
+ s->real_sprite_warping_points= s->num_sprite_warping_points;
+ }
+}
+
+/**
+ * decodes the next video packet.
+ * @return <0 if something went wrong
+ */
+int mpeg4_decode_video_packet_header(MpegEncContext *s)
+{
+ int mb_num_bits= av_log2(s->mb_num - 1) + 1;
+ int header_extension=0, mb_num, len;
+
+ /* is there enough space left for a video packet + header */
+ if( get_bits_count(&s->gb) > s->gb.size_in_bits-20) return -1;
+
+ for(len=0; len<32; len++){
+ if(get_bits1(&s->gb)) break;
+ }
+
+ if(len!=ff_mpeg4_get_video_packet_prefix_length(s)){
+ av_log(s->avctx, AV_LOG_ERROR, "marker does not match f_code\n");
+ return -1;
+ }
+
+ if(s->shape != RECT_SHAPE){
+ header_extension= get_bits1(&s->gb);
+ //FIXME more stuff here
+ }
+
+ mb_num= get_bits(&s->gb, mb_num_bits);
+ if(mb_num>=s->mb_num){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal mb_num in video packet (%d %d) \n", mb_num, s->mb_num);
+ return -1;
+ }
+ if(s->pict_type == FF_B_TYPE){
+ while(s->next_picture.mbskip_table[ s->mb_index2xy[ mb_num ] ]) mb_num++;
+ if(mb_num >= s->mb_num) return -1; // slice contains just skipped MBs which where already decoded
+ }
+
+ s->mb_x= mb_num % s->mb_width;
+ s->mb_y= mb_num / s->mb_width;
+
+ if(s->shape != BIN_ONLY_SHAPE){
+ int qscale= get_bits(&s->gb, s->quant_precision);
+ if(qscale)
+ s->chroma_qscale=s->qscale= qscale;
+ }
+
+ if(s->shape == RECT_SHAPE){
+ header_extension= get_bits1(&s->gb);
+ }
+ if(header_extension){
+ int time_increment;
+ int time_incr=0;
+
+ while (get_bits1(&s->gb) != 0)
+ time_incr++;
+
+ check_marker(&s->gb, "before time_increment in video packed header");
+ time_increment= get_bits(&s->gb, s->time_increment_bits);
+ check_marker(&s->gb, "before vop_coding_type in video packed header");
+
+ skip_bits(&s->gb, 2); /* vop coding type */
+ //FIXME not rect stuff here
+
+ if(s->shape != BIN_ONLY_SHAPE){
+ skip_bits(&s->gb, 3); /* intra dc vlc threshold */
+//FIXME don't just ignore everything
+ if(s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
+ mpeg4_decode_sprite_trajectory(s, &s->gb);
+ av_log(s->avctx, AV_LOG_ERROR, "untested\n");
+ }
+
+ //FIXME reduced res stuff here
+
+ if (s->pict_type != FF_I_TYPE) {
+ int f_code = get_bits(&s->gb, 3); /* fcode_for */
+ if(f_code==0){
+ av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (f_code=0)\n");
+ }
+ }
+ if (s->pict_type == FF_B_TYPE) {
+ int b_code = get_bits(&s->gb, 3);
+ if(b_code==0){
+ av_log(s->avctx, AV_LOG_ERROR, "Error, video packet header damaged (b_code=0)\n");
+ }
+ }
+ }
+ }
+ //FIXME new-pred stuff
+
+ return 0;
+}
+
+/**
+ * gets the average motion vector for a GMC MB.
+ * @param n either 0 for the x component or 1 for y
+ * @returns the average MV for a GMC MB
+ */
+static inline int get_amv(MpegEncContext *s, int n){
+ int x, y, mb_v, sum, dx, dy, shift;
+ int len = 1 << (s->f_code + 4);
+ const int a= s->sprite_warping_accuracy;
+
+ if(s->workaround_bugs & FF_BUG_AMV)
+ len >>= s->quarter_sample;
+
+ if(s->real_sprite_warping_points==1){
+ if(s->divx_version==500 && s->divx_build==413)
+ sum= s->sprite_offset[0][n] / (1<<(a - s->quarter_sample));
+ else
+ sum= RSHIFT(s->sprite_offset[0][n]<<s->quarter_sample, a);
+ }else{
+ dx= s->sprite_delta[n][0];
+ dy= s->sprite_delta[n][1];
+ shift= s->sprite_shift[0];
+ if(n) dy -= 1<<(shift + a + 1);
+ else dx -= 1<<(shift + a + 1);
+ mb_v= s->sprite_offset[0][n] + dx*s->mb_x*16 + dy*s->mb_y*16;
+
+ sum=0;
+ for(y=0; y<16; y++){
+ int v;
+
+ v= mb_v + dy*y;
+ //XXX FIXME optimize
+ for(x=0; x<16; x++){
+ sum+= v>>shift;
+ v+= dx;
+ }
+ }
+ sum= RSHIFT(sum, a+8-s->quarter_sample);
+ }
+
+ if (sum < -len) sum= -len;
+ else if (sum >= len) sum= len-1;
+
+ return sum;
+}
+
+/**
+ * decodes the dc value.
+ * @param n block index (0-3 are luma, 4-5 are chroma)
+ * @param dir_ptr the prediction direction will be stored here
+ * @return the quantized dc
+ */
+static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
+{
+ int level, code;
+
+ if (n < 4)
+ code = get_vlc2(&s->gb, dc_lum.table, DC_VLC_BITS, 1);
+ else
+ code = get_vlc2(&s->gb, dc_chrom.table, DC_VLC_BITS, 1);
+ if (code < 0 || code > 9 /* && s->nbit<9 */){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
+ return -1;
+ }
+ if (code == 0) {
+ level = 0;
+ } else {
+ if(IS_3IV1){
+ if(code==1)
+ level= 2*get_bits1(&s->gb)-1;
+ else{
+ if(get_bits1(&s->gb))
+ level = get_bits(&s->gb, code-1) + (1<<(code-1));
+ else
+ level = -get_bits(&s->gb, code-1) - (1<<(code-1));
+ }
+ }else{
+ level = get_xbits(&s->gb, code);
+ }
+
+ if (code > 8){
+ if(get_bits1(&s->gb)==0){ /* marker */
+ if(s->error_recognition>=2){
+ av_log(s->avctx, AV_LOG_ERROR, "dc marker bit missing\n");
+ return -1;
+ }
+ }
+ }
+ }
+
+ return ff_mpeg4_pred_dc(s, n, level, dir_ptr, 0);
+}
+
+/**
+ * decodes first partition.
+ * @return number of MBs decoded or <0 if an error occurred
+ */
+static int mpeg4_decode_partition_a(MpegEncContext *s){
+ int mb_num;
+ static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
+
+ /* decode first partition */
+ mb_num=0;
+ s->first_slice_line=1;
+ for(; s->mb_y<s->mb_height; s->mb_y++){
+ ff_init_block_index(s);
+ for(; s->mb_x<s->mb_width; s->mb_x++){
+ const int xy= s->mb_x + s->mb_y*s->mb_stride;
+ int cbpc;
+ int dir=0;
+
+ mb_num++;
+ ff_update_block_index(s);
+ if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
+ s->first_slice_line=0;
+
+ if(s->pict_type==FF_I_TYPE){
+ int i;
+
+ do{
+ if(show_bits_long(&s->gb, 19)==DC_MARKER){
+ return mb_num-1;
+ }
+
+ cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
+ if (cbpc < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ }while(cbpc == 8);
+
+ s->cbp_table[xy]= cbpc & 3;
+ s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
+ s->mb_intra = 1;
+
+ if(cbpc & 4) {
+ ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
+ }
+ s->current_picture.qscale_table[xy]= s->qscale;
+
+ s->mbintra_table[xy]= 1;
+ for(i=0; i<6; i++){
+ int dc_pred_dir;
+ int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
+ if(dc < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ dir<<=1;
+ if(dc_pred_dir) dir|=1;
+ }
+ s->pred_dir_table[xy]= dir;
+ }else{ /* P/S_TYPE */
+ int mx, my, pred_x, pred_y, bits;
+ int16_t * const mot_val= s->current_picture.motion_val[0][s->block_index[0]];
+ const int stride= s->b8_stride*2;
+
+try_again:
+ bits= show_bits(&s->gb, 17);
+ if(bits==MOTION_MARKER){
+ return mb_num-1;
+ }
+ skip_bits1(&s->gb);
+ if(bits&0x10000){
+ /* skip mb */
+ if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
+ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
+ mx= get_amv(s, 0);
+ my= get_amv(s, 1);
+ }else{
+ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
+ mx=my=0;
+ }
+ mot_val[0 ]= mot_val[2 ]=
+ mot_val[0+stride]= mot_val[2+stride]= mx;
+ mot_val[1 ]= mot_val[3 ]=
+ mot_val[1+stride]= mot_val[3+stride]= my;
+
+ if(s->mbintra_table[xy])
+ ff_clean_intra_table_entries(s);
+ continue;
+ }
+
+ cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
+ if (cbpc < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "cbpc corrupted at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ if(cbpc == 20)
+ goto try_again;
+
+ s->cbp_table[xy]= cbpc&(8+3); //8 is dquant
+
+ s->mb_intra = ((cbpc & 4) != 0);
+
+ if(s->mb_intra){
+ s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
+ s->mbintra_table[xy]= 1;
+ mot_val[0 ]= mot_val[2 ]=
+ mot_val[0+stride]= mot_val[2+stride]= 0;
+ mot_val[1 ]= mot_val[3 ]=
+ mot_val[1+stride]= mot_val[3+stride]= 0;
+ }else{
+ if(s->mbintra_table[xy])
+ ff_clean_intra_table_entries(s);
+
+ if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
+ s->mcsel= get_bits1(&s->gb);
+ else s->mcsel= 0;
+
+ if ((cbpc & 16) == 0) {
+ /* 16x16 motion prediction */
+
+ h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+ if(!s->mcsel){
+ mx = h263_decode_motion(s, pred_x, s->f_code);
+ if (mx >= 0xffff)
+ return -1;
+
+ my = h263_decode_motion(s, pred_y, s->f_code);
+ if (my >= 0xffff)
+ return -1;
+ s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
+ } else {
+ mx = get_amv(s, 0);
+ my = get_amv(s, 1);
+ s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_GMC | MB_TYPE_L0;
+ }
+
+ mot_val[0 ]= mot_val[2 ] =
+ mot_val[0+stride]= mot_val[2+stride]= mx;
+ mot_val[1 ]= mot_val[3 ]=
+ mot_val[1+stride]= mot_val[3+stride]= my;
+ } else {
+ int i;
+ s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
+ for(i=0;i<4;i++) {
+ int16_t *mot_val= h263_pred_motion(s, i, 0, &pred_x, &pred_y);
+ mx = h263_decode_motion(s, pred_x, s->f_code);
+ if (mx >= 0xffff)
+ return -1;
+
+ my = h263_decode_motion(s, pred_y, s->f_code);
+ if (my >= 0xffff)
+ return -1;
+ mot_val[0] = mx;
+ mot_val[1] = my;
+ }
+ }
+ }
+ }
+ }
+ s->mb_x= 0;
+ }
+
+ return mb_num;
+}
+
+/**
+ * decode second partition.
+ * @return <0 if an error occurred
+ */
+static int mpeg4_decode_partition_b(MpegEncContext *s, int mb_count){
+ int mb_num=0;
+ static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
+
+ s->mb_x= s->resync_mb_x;
+ s->first_slice_line=1;
+ for(s->mb_y= s->resync_mb_y; mb_num < mb_count; s->mb_y++){
+ ff_init_block_index(s);
+ for(; mb_num < mb_count && s->mb_x<s->mb_width; s->mb_x++){
+ const int xy= s->mb_x + s->mb_y*s->mb_stride;
+
+ mb_num++;
+ ff_update_block_index(s);
+ if(s->mb_x == s->resync_mb_x && s->mb_y == s->resync_mb_y+1)
+ s->first_slice_line=0;
+
+ if(s->pict_type==FF_I_TYPE){
+ int ac_pred= get_bits1(&s->gb);
+ int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
+ if(cbpy<0){
+ av_log(s->avctx, AV_LOG_ERROR, "cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+
+ s->cbp_table[xy]|= cbpy<<2;
+ s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
+ }else{ /* P || S_TYPE */
+ if(IS_INTRA(s->current_picture.mb_type[xy])){
+ int dir=0,i;
+ int ac_pred = get_bits1(&s->gb);
+ int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
+
+ if(cbpy<0){
+ av_log(s->avctx, AV_LOG_ERROR, "I cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+
+ if(s->cbp_table[xy] & 8) {
+ ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
+ }
+ s->current_picture.qscale_table[xy]= s->qscale;
+
+ for(i=0; i<6; i++){
+ int dc_pred_dir;
+ int dc= mpeg4_decode_dc(s, i, &dc_pred_dir);
+ if(dc < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "DC corrupted at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ dir<<=1;
+ if(dc_pred_dir) dir|=1;
+ }
+ s->cbp_table[xy]&= 3; //remove dquant
+ s->cbp_table[xy]|= cbpy<<2;
+ s->current_picture.mb_type[xy] |= ac_pred*MB_TYPE_ACPRED;
+ s->pred_dir_table[xy]= dir;
+ }else if(IS_SKIP(s->current_picture.mb_type[xy])){
+ s->current_picture.qscale_table[xy]= s->qscale;
+ s->cbp_table[xy]= 0;
+ }else{
+ int cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
+
+ if(cbpy<0){
+ av_log(s->avctx, AV_LOG_ERROR, "P cbpy corrupted at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+
+ if(s->cbp_table[xy] & 8) {
+ ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
+ }
+ s->current_picture.qscale_table[xy]= s->qscale;
+
+ s->cbp_table[xy]&= 3; //remove dquant
+ s->cbp_table[xy]|= (cbpy^0xf)<<2;
+ }
+ }
+ }
+ if(mb_num >= mb_count) return 0;
+ s->mb_x= 0;
+ }
+ return 0;
+}
+
+/**
+ * decodes the first & second partition
+ * @return <0 if error (and sets error type in the error_status_table)
+ */
+int ff_mpeg4_decode_partitions(MpegEncContext *s)
+{
+ int mb_num;
+ const int part_a_error= s->pict_type==FF_I_TYPE ? (DC_ERROR|MV_ERROR) : MV_ERROR;
+ const int part_a_end = s->pict_type==FF_I_TYPE ? (DC_END |MV_END) : MV_END;
+
+ mb_num= mpeg4_decode_partition_a(s);
+ if(mb_num<0){
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
+ return -1;
+ }
+
+ if(s->resync_mb_x + s->resync_mb_y*s->mb_width + mb_num > s->mb_num){
+ av_log(s->avctx, AV_LOG_ERROR, "slice below monitor ...\n");
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, part_a_error);
+ return -1;
+ }
+
+ s->mb_num_left= mb_num;
+
+ if(s->pict_type==FF_I_TYPE){
+ while(show_bits(&s->gb, 9) == 1)
+ skip_bits(&s->gb, 9);
+ if(get_bits_long(&s->gb, 19)!=DC_MARKER){
+ av_log(s->avctx, AV_LOG_ERROR, "marker missing after first I partition at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ }else{
+ while(show_bits(&s->gb, 10) == 1)
+ skip_bits(&s->gb, 10);
+ if(get_bits(&s->gb, 17)!=MOTION_MARKER){
+ av_log(s->avctx, AV_LOG_ERROR, "marker missing after first P partition at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ }
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, part_a_end);
+
+ if( mpeg4_decode_partition_b(s, mb_num) < 0){
+ if(s->pict_type==FF_P_TYPE)
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, DC_ERROR);
+ return -1;
+ }else{
+ if(s->pict_type==FF_P_TYPE)
+ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, DC_END);
+ }
+
+ return 0;
+}
+
+/**
+ * decodes a block.
+ * @return <0 if an error occurred
+ */
+static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
+ int n, int coded, int intra, int rvlc)
+{
+ int level, i, last, run;
+ int dc_pred_dir;
+ RLTable * rl;
+ RL_VLC_ELEM * rl_vlc;
+ const uint8_t * scan_table;
+ int qmul, qadd;
+
+ //Note intra & rvlc should be optimized away if this is inlined
+
+ if(intra) {
+ if(s->use_intra_dc_vlc){
+ /* DC coef */
+ if(s->partitioned_frame){
+ level = s->dc_val[0][ s->block_index[n] ];
+ if(n<4) level= FASTDIV((level + (s->y_dc_scale>>1)), s->y_dc_scale);
+ else level= FASTDIV((level + (s->c_dc_scale>>1)), s->c_dc_scale);
+ dc_pred_dir= (s->pred_dir_table[s->mb_x + s->mb_y*s->mb_stride]<<n)&32;
+ }else{
+ level = mpeg4_decode_dc(s, n, &dc_pred_dir);
+ if (level < 0)
+ return -1;
+ }
+ block[0] = level;
+ i = 0;
+ }else{
+ i = -1;
+ ff_mpeg4_pred_dc(s, n, 0, &dc_pred_dir, 0);
+ }
+ if (!coded)
+ goto not_coded;
+
+ if(rvlc){
+ rl = &rvlc_rl_intra;
+ rl_vlc = rvlc_rl_intra.rl_vlc[0];
+ }else{
+ rl = &rl_intra;
+ rl_vlc = rl_intra.rl_vlc[0];
+ }
+ if (s->ac_pred) {
+ if (dc_pred_dir == 0)
+ scan_table = s->intra_v_scantable.permutated; /* left */
+ else
+ scan_table = s->intra_h_scantable.permutated; /* top */
+ } else {
+ scan_table = s->intra_scantable.permutated;
+ }
+ qmul=1;
+ qadd=0;
+ } else {
+ i = -1;
+ if (!coded) {
+ s->block_last_index[n] = i;
+ return 0;
+ }
+ if(rvlc) rl = &rvlc_rl_inter;
+ else rl = &rl_inter;
+
+ scan_table = s->intra_scantable.permutated;
+
+ if(s->mpeg_quant){
+ qmul=1;
+ qadd=0;
+ if(rvlc){
+ rl_vlc = rvlc_rl_inter.rl_vlc[0];
+ }else{
+ rl_vlc = rl_inter.rl_vlc[0];
+ }
+ }else{
+ qmul = s->qscale << 1;
+ qadd = (s->qscale - 1) | 1;
+ if(rvlc){
+ rl_vlc = rvlc_rl_inter.rl_vlc[s->qscale];
+ }else{
+ rl_vlc = rl_inter.rl_vlc[s->qscale];
+ }
+ }
+ }
+ {
+ OPEN_READER(re, &s->gb);
+ for(;;) {
+ UPDATE_CACHE(re, &s->gb);
+ GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
+ if (level==0) {
+ /* escape */
+ if(rvlc){
+ if(SHOW_UBITS(re, &s->gb, 1)==0){
+ av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in rvlc esc\n");
+ return -1;
+ }; SKIP_CACHE(re, &s->gb, 1);
+
+ last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
+ run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
+ SKIP_COUNTER(re, &s->gb, 1+1+6);
+ UPDATE_CACHE(re, &s->gb);
+
+ if(SHOW_UBITS(re, &s->gb, 1)==0){
+ av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in rvlc esc\n");
+ return -1;
+ }; SKIP_CACHE(re, &s->gb, 1);
+
+ level= SHOW_UBITS(re, &s->gb, 11); SKIP_CACHE(re, &s->gb, 11);
+
+ if(SHOW_UBITS(re, &s->gb, 5)!=0x10){
+ av_log(s->avctx, AV_LOG_ERROR, "reverse esc missing\n");
+ return -1;
+ }; SKIP_CACHE(re, &s->gb, 5);
+
+ level= level * qmul + qadd;
+ level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_CACHE(re, &s->gb, 1);
+ SKIP_COUNTER(re, &s->gb, 1+11+5+1);
+
+ i+= run + 1;
+ if(last) i+=192;
+ }else{
+ int cache;
+ cache= GET_CACHE(re, &s->gb);
+
+ if(IS_3IV1)
+ cache ^= 0xC0000000;
+
+ if (cache&0x80000000) {
+ if (cache&0x40000000) {
+ /* third escape */
+ SKIP_CACHE(re, &s->gb, 2);
+ last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
+ run= SHOW_UBITS(re, &s->gb, 6); LAST_SKIP_CACHE(re, &s->gb, 6);
+ SKIP_COUNTER(re, &s->gb, 2+1+6);
+ UPDATE_CACHE(re, &s->gb);
+
+ if(IS_3IV1){
+ level= SHOW_SBITS(re, &s->gb, 12); LAST_SKIP_BITS(re, &s->gb, 12);
+ }else{
+ if(SHOW_UBITS(re, &s->gb, 1)==0){
+ av_log(s->avctx, AV_LOG_ERROR, "1. marker bit missing in 3. esc\n");
+ return -1;
+ }; SKIP_CACHE(re, &s->gb, 1);
+
+ level= SHOW_SBITS(re, &s->gb, 12); SKIP_CACHE(re, &s->gb, 12);
+
+ if(SHOW_UBITS(re, &s->gb, 1)==0){
+ av_log(s->avctx, AV_LOG_ERROR, "2. marker bit missing in 3. esc\n");
+ return -1;
+ }; LAST_SKIP_CACHE(re, &s->gb, 1);
+
+ SKIP_COUNTER(re, &s->gb, 1+12+1);
+ }
+
+#if 0
+ if(s->error_recognition >= FF_ER_COMPLIANT){
+ const int abs_level= FFABS(level);
+ if(abs_level<=MAX_LEVEL && run<=MAX_RUN){
+ const int run1= run - rl->max_run[last][abs_level] - 1;
+ if(abs_level <= rl->max_level[last][run]){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, vlc encoding possible\n");
+ return -1;
+ }
+ if(s->error_recognition > FF_ER_COMPLIANT){
+ if(abs_level <= rl->max_level[last][run]*2){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 1 encoding possible\n");
+ return -1;
+ }
+ if(run1 >= 0 && abs_level <= rl->max_level[last][run1]){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal 3. esc, esc 2 encoding possible\n");
+ return -1;
+ }
+ }
+ }
+ }
+#endif
+ if (level>0) level= level * qmul + qadd;
+ else level= level * qmul - qadd;
+
+ if((unsigned)(level + 2048) > 4095){
+ if(s->error_recognition > FF_ER_COMPLIANT){
+ if(level > 2560 || level<-2560){
+ av_log(s->avctx, AV_LOG_ERROR, "|level| overflow in 3. esc, qp=%d\n", s->qscale);
+ return -1;
+ }
+ }
+ level= level<0 ? -2048 : 2047;
+ }
+
+ i+= run + 1;
+ if(last) i+=192;
+ } else {
+ /* second escape */
+#if MIN_CACHE_BITS < 20
+ LAST_SKIP_BITS(re, &s->gb, 2);
+ UPDATE_CACHE(re, &s->gb);
+#else
+ SKIP_BITS(re, &s->gb, 2);
+#endif
+ GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
+ i+= run + rl->max_run[run>>7][level/qmul] +1; //FIXME opt indexing
+ level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
+ LAST_SKIP_BITS(re, &s->gb, 1);
+ }
+ } else {
+ /* first escape */
+#if MIN_CACHE_BITS < 19
+ LAST_SKIP_BITS(re, &s->gb, 1);
+ UPDATE_CACHE(re, &s->gb);
+#else
+ SKIP_BITS(re, &s->gb, 1);
+#endif
+ GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
+ i+= run;
+ level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
+ level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
+ LAST_SKIP_BITS(re, &s->gb, 1);
+ }
+ }
+ } else {
+ i+= run;
+ level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
+ LAST_SKIP_BITS(re, &s->gb, 1);
+ }
+ if (i > 62){
+ i-= 192;
+ if(i&(~63)){
+ av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+
+ block[scan_table[i]] = level;
+ break;
+ }
+
+ block[scan_table[i]] = level;
+ }
+ CLOSE_READER(re, &s->gb);
+ }
+ not_coded:
+ if (intra) {
+ if(!s->use_intra_dc_vlc){
+ block[0] = ff_mpeg4_pred_dc(s, n, block[0], &dc_pred_dir, 0);
+
+ i -= i>>31; //if(i == -1) i=0;
+ }
+
+ mpeg4_pred_ac(s, block, n, dc_pred_dir);
+ if (s->ac_pred) {
+ i = 63; /* XXX: not optimal */
+ }
+ }
+ s->block_last_index[n] = i;
+ return 0;
+}
+
+/**
+ * decode partition C of one MB.
+ * @return <0 if an error occurred
+ */
+static int mpeg4_decode_partitioned_mb(MpegEncContext *s, DCTELEM block[6][64])
+{
+ int cbp, mb_type;
+ const int xy= s->mb_x + s->mb_y*s->mb_stride;
+
+ mb_type= s->current_picture.mb_type[xy];
+ cbp = s->cbp_table[xy];
+
+ s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
+
+ if(s->current_picture.qscale_table[xy] != s->qscale){
+ ff_set_qscale(s, s->current_picture.qscale_table[xy] );
+ }
+
+ if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
+ int i;
+ for(i=0; i<4; i++){
+ s->mv[0][i][0] = s->current_picture.motion_val[0][ s->block_index[i] ][0];
+ s->mv[0][i][1] = s->current_picture.motion_val[0][ s->block_index[i] ][1];
+ }
+ s->mb_intra = IS_INTRA(mb_type);
+
+ if (IS_SKIP(mb_type)) {
+ /* skip mb */
+ for(i=0;i<6;i++)
+ s->block_last_index[i] = -1;
+ s->mv_dir = MV_DIR_FORWARD;
+ s->mv_type = MV_TYPE_16X16;
+ if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
+ s->mcsel=1;
+ s->mb_skipped = 0;
+ }else{
+ s->mcsel=0;
+ s->mb_skipped = 1;
+ }
+ }else if(s->mb_intra){
+ s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
+ }else if(!s->mb_intra){
+// s->mcsel= 0; //FIXME do we need to init that
+
+ s->mv_dir = MV_DIR_FORWARD;
+ if (IS_8X8(mb_type)) {
+ s->mv_type = MV_TYPE_8X8;
+ } else {
+ s->mv_type = MV_TYPE_16X16;
+ }
+ }
+ } else { /* I-Frame */
+ s->mb_intra = 1;
+ s->ac_pred = IS_ACPRED(s->current_picture.mb_type[xy]);
+ }
+
+ if (!IS_SKIP(mb_type)) {
+ int i;
+ s->dsp.clear_blocks(s->block[0]);
+ /* decode each block */
+ for (i = 0; i < 6; i++) {
+ if(mpeg4_decode_block(s, block[i], i, cbp&32, s->mb_intra, s->rvlc) < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "texture corrupted at %d %d %d\n", s->mb_x, s->mb_y, s->mb_intra);
+ return -1;
+ }
+ cbp+=cbp;
+ }
+ }
+
+ /* per-MB end of slice check */
+
+ if(--s->mb_num_left <= 0){
+ if(mpeg4_is_resync(s))
+ return SLICE_END;
+ else
+ return SLICE_NOEND;
+ }else{
+ if(mpeg4_is_resync(s)){
+ const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
+ if(s->cbp_table[xy+delta])
+ return SLICE_END;
+ }
+ return SLICE_OK;
+ }
+}
+
+static int mpeg4_decode_mb(MpegEncContext *s,
+ DCTELEM block[6][64])
+{
+ int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
+ int16_t *mot_val;
+ static int8_t quant_tab[4] = { -1, -2, 1, 2 };
+ const int xy= s->mb_x + s->mb_y * s->mb_stride;
+
+ assert(s->h263_pred);
+
+ if (s->pict_type == FF_P_TYPE || s->pict_type==FF_S_TYPE) {
+ do{
+ if (get_bits1(&s->gb)) {
+ /* skip mb */
+ s->mb_intra = 0;
+ for(i=0;i<6;i++)
+ s->block_last_index[i] = -1;
+ s->mv_dir = MV_DIR_FORWARD;
+ s->mv_type = MV_TYPE_16X16;
+ if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE){
+ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
+ s->mcsel=1;
+ s->mv[0][0][0]= get_amv(s, 0);
+ s->mv[0][0][1]= get_amv(s, 1);
+
+ s->mb_skipped = 0;
+ }else{
+ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
+ s->mcsel=0;
+ s->mv[0][0][0] = 0;
+ s->mv[0][0][1] = 0;
+ s->mb_skipped = 1;
+ }
+ goto end;
+ }
+ cbpc = get_vlc2(&s->gb, inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
+ if (cbpc < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ }while(cbpc == 20);
+
+ s->dsp.clear_blocks(s->block[0]);
+ dquant = cbpc & 8;
+ s->mb_intra = ((cbpc & 4) != 0);
+ if (s->mb_intra) goto intra;
+
+ if(s->pict_type==FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE && (cbpc & 16) == 0)
+ s->mcsel= get_bits1(&s->gb);
+ else s->mcsel= 0;
+ cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1) ^ 0x0F;
+
+ cbp = (cbpc & 3) | (cbpy << 2);
+ if (dquant) {
+ ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
+ }
+ if((!s->progressive_sequence) && (cbp || (s->workaround_bugs&FF_BUG_XVID_ILACE)))
+ s->interlaced_dct= get_bits1(&s->gb);
+
+ s->mv_dir = MV_DIR_FORWARD;
+ if ((cbpc & 16) == 0) {
+ if(s->mcsel){
+ s->current_picture.mb_type[xy]= MB_TYPE_GMC | MB_TYPE_16x16 | MB_TYPE_L0;
+ /* 16x16 global motion prediction */
+ s->mv_type = MV_TYPE_16X16;
+ mx= get_amv(s, 0);
+ my= get_amv(s, 1);
+ s->mv[0][0][0] = mx;
+ s->mv[0][0][1] = my;
+ }else if((!s->progressive_sequence) && get_bits1(&s->gb)){
+ s->current_picture.mb_type[xy]= MB_TYPE_16x8 | MB_TYPE_L0 | MB_TYPE_INTERLACED;
+ /* 16x8 field motion prediction */
+ s->mv_type= MV_TYPE_FIELD;
+
+ s->field_select[0][0]= get_bits1(&s->gb);
+ s->field_select[0][1]= get_bits1(&s->gb);
+
+ h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+
+ for(i=0; i<2; i++){
+ mx = h263_decode_motion(s, pred_x, s->f_code);
+ if (mx >= 0xffff)
+ return -1;
+
+ my = h263_decode_motion(s, pred_y/2, s->f_code);
+ if (my >= 0xffff)
+ return -1;
+
+ s->mv[0][i][0] = mx;
+ s->mv[0][i][1] = my;
+ }
+ }else{
+ s->current_picture.mb_type[xy]= MB_TYPE_16x16 | MB_TYPE_L0;
+ /* 16x16 motion prediction */
+ s->mv_type = MV_TYPE_16X16;
+ h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
+ mx = h263_decode_motion(s, pred_x, s->f_code);
+
+ if (mx >= 0xffff)
+ return -1;
+
+ my = h263_decode_motion(s, pred_y, s->f_code);
+
+ if (my >= 0xffff)
+ return -1;
+ s->mv[0][0][0] = mx;
+ s->mv[0][0][1] = my;
+ }
+ } else {
+ s->current_picture.mb_type[xy]= MB_TYPE_8x8 | MB_TYPE_L0;
+ s->mv_type = MV_TYPE_8X8;
+ for(i=0;i<4;i++) {
+ mot_val = h263_pred_motion(s, i, 0, &pred_x, &pred_y);
+ mx = h263_decode_motion(s, pred_x, s->f_code);
+ if (mx >= 0xffff)
+ return -1;
+
+ my = h263_decode_motion(s, pred_y, s->f_code);
+ if (my >= 0xffff)
+ return -1;
+ s->mv[0][i][0] = mx;
+ s->mv[0][i][1] = my;
+ mot_val[0] = mx;
+ mot_val[1] = my;
+ }
+ }
+ } else if(s->pict_type==FF_B_TYPE) {
+ int modb1; // first bit of modb
+ int modb2; // second bit of modb
+ int mb_type;
+
+ s->mb_intra = 0; //B-frames never contain intra blocks
+ s->mcsel=0; // ... true gmc blocks
+
+ if(s->mb_x==0){
+ for(i=0; i<2; i++){
+ s->last_mv[i][0][0]=
+ s->last_mv[i][0][1]=
+ s->last_mv[i][1][0]=
+ s->last_mv[i][1][1]= 0;
+ }
+ }
+
+ /* if we skipped it in the future P Frame than skip it now too */
+ s->mb_skipped= s->next_picture.mbskip_table[s->mb_y * s->mb_stride + s->mb_x]; // Note, skiptab=0 if last was GMC
+
+ if(s->mb_skipped){
+ /* skip mb */
+ for(i=0;i<6;i++)
+ s->block_last_index[i] = -1;
+
+ s->mv_dir = MV_DIR_FORWARD;
+ s->mv_type = MV_TYPE_16X16;
+ s->mv[0][0][0] = 0;
+ s->mv[0][0][1] = 0;
+ s->mv[1][0][0] = 0;
+ s->mv[1][0][1] = 0;
+ s->current_picture.mb_type[xy]= MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
+ goto end;
+ }
+
+ modb1= get_bits1(&s->gb);
+ if(modb1){
+ mb_type= MB_TYPE_DIRECT2 | MB_TYPE_SKIP | MB_TYPE_L0L1; //like MB_TYPE_B_DIRECT but no vectors coded
+ cbp=0;
+ }else{
+ modb2= get_bits1(&s->gb);
+ mb_type= get_vlc2(&s->gb, mb_type_b_vlc.table, MB_TYPE_B_VLC_BITS, 1);
+ if(mb_type<0){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal MB_type\n");
+ return -1;
+ }
+ mb_type= mb_type_b_map[ mb_type ];
+ if(modb2) cbp= 0;
+ else{
+ s->dsp.clear_blocks(s->block[0]);
+ cbp= get_bits(&s->gb, 6);
+ }
+
+ if ((!IS_DIRECT(mb_type)) && cbp) {
+ if(get_bits1(&s->gb)){
+ ff_set_qscale(s, s->qscale + get_bits1(&s->gb)*4 - 2);
+ }
+ }
+
+ if(!s->progressive_sequence){
+ if(cbp)
+ s->interlaced_dct= get_bits1(&s->gb);
+
+ if(!IS_DIRECT(mb_type) && get_bits1(&s->gb)){
+ mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED;
+ mb_type &= ~MB_TYPE_16x16;
+
+ if(USES_LIST(mb_type, 0)){
+ s->field_select[0][0]= get_bits1(&s->gb);
+ s->field_select[0][1]= get_bits1(&s->gb);
+ }
+ if(USES_LIST(mb_type, 1)){
+ s->field_select[1][0]= get_bits1(&s->gb);
+ s->field_select[1][1]= get_bits1(&s->gb);
+ }
+ }
+ }
+
+ s->mv_dir = 0;
+ if((mb_type & (MB_TYPE_DIRECT2|MB_TYPE_INTERLACED)) == 0){
+ s->mv_type= MV_TYPE_16X16;
+
+ if(USES_LIST(mb_type, 0)){
+ s->mv_dir = MV_DIR_FORWARD;
+
+ mx = h263_decode_motion(s, s->last_mv[0][0][0], s->f_code);
+ my = h263_decode_motion(s, s->last_mv[0][0][1], s->f_code);
+ s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->mv[0][0][0] = mx;
+ s->last_mv[0][1][1]= s->last_mv[0][0][1]= s->mv[0][0][1] = my;
+ }
+
+ if(USES_LIST(mb_type, 1)){
+ s->mv_dir |= MV_DIR_BACKWARD;
+
+ mx = h263_decode_motion(s, s->last_mv[1][0][0], s->b_code);
+ my = h263_decode_motion(s, s->last_mv[1][0][1], s->b_code);
+ s->last_mv[1][1][0]= s->last_mv[1][0][0]= s->mv[1][0][0] = mx;
+ s->last_mv[1][1][1]= s->last_mv[1][0][1]= s->mv[1][0][1] = my;
+ }
+ }else if(!IS_DIRECT(mb_type)){
+ s->mv_type= MV_TYPE_FIELD;
+
+ if(USES_LIST(mb_type, 0)){
+ s->mv_dir = MV_DIR_FORWARD;
+
+ for(i=0; i<2; i++){
+ mx = h263_decode_motion(s, s->last_mv[0][i][0] , s->f_code);
+ my = h263_decode_motion(s, s->last_mv[0][i][1]/2, s->f_code);
+ s->last_mv[0][i][0]= s->mv[0][i][0] = mx;
+ s->last_mv[0][i][1]= (s->mv[0][i][1] = my)*2;
+ }
+ }
+
+ if(USES_LIST(mb_type, 1)){
+ s->mv_dir |= MV_DIR_BACKWARD;
+
+ for(i=0; i<2; i++){
+ mx = h263_decode_motion(s, s->last_mv[1][i][0] , s->b_code);
+ my = h263_decode_motion(s, s->last_mv[1][i][1]/2, s->b_code);
+ s->last_mv[1][i][0]= s->mv[1][i][0] = mx;
+ s->last_mv[1][i][1]= (s->mv[1][i][1] = my)*2;
+ }
+ }
+ }
+ }
+
+ if(IS_DIRECT(mb_type)){
+ if(IS_SKIP(mb_type))
+ mx=my=0;
+ else{
+ mx = h263_decode_motion(s, 0, 1);
+ my = h263_decode_motion(s, 0, 1);
+ }
+
+ s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
+ mb_type |= ff_mpeg4_set_direct_mv(s, mx, my);
+ }
+ s->current_picture.mb_type[xy]= mb_type;
+ } else { /* I-Frame */
+ do{
+ cbpc = get_vlc2(&s->gb, intra_MCBPC_vlc.table, INTRA_MCBPC_VLC_BITS, 2);
+ if (cbpc < 0){
+ av_log(s->avctx, AV_LOG_ERROR, "I cbpc damaged at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ }while(cbpc == 8);
+
+ dquant = cbpc & 4;
+ s->mb_intra = 1;
+intra:
+ s->ac_pred = get_bits1(&s->gb);
+ if(s->ac_pred)
+ s->current_picture.mb_type[xy]= MB_TYPE_INTRA | MB_TYPE_ACPRED;
+ else
+ s->current_picture.mb_type[xy]= MB_TYPE_INTRA;
+
+ cbpy = get_vlc2(&s->gb, cbpy_vlc.table, CBPY_VLC_BITS, 1);
+ if(cbpy<0){
+ av_log(s->avctx, AV_LOG_ERROR, "I cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
+ return -1;
+ }
+ cbp = (cbpc & 3) | (cbpy << 2);
+
+ s->use_intra_dc_vlc= s->qscale < s->intra_dc_threshold;
+
+ if (dquant) {
+ ff_set_qscale(s, s->qscale + quant_tab[get_bits(&s->gb, 2)]);
+ }
+
+ if(!s->progressive_sequence)
+ s->interlaced_dct= get_bits1(&s->gb);
+
+ s->dsp.clear_blocks(s->block[0]);
+ /* decode each block */
+ for (i = 0; i < 6; i++) {
+ if (mpeg4_decode_block(s, block[i], i, cbp&32, 1, 0) < 0)
+ return -1;
+ cbp+=cbp;
+ }
+ goto end;
+ }
+
+ /* decode each block */
+ for (i = 0; i < 6; i++) {
+ if (mpeg4_decode_block(s, block[i], i, cbp&32, 0, 0) < 0)
+ return -1;
+ cbp+=cbp;
+ }
+end:
+
+ /* per-MB end of slice check */
+ if(s->codec_id==CODEC_ID_MPEG4){
+ if(mpeg4_is_resync(s)){
+ const int delta= s->mb_x + 1 == s->mb_width ? 2 : 1;
+ if(s->pict_type==FF_B_TYPE && s->next_picture.mbskip_table[xy + delta])
+ return SLICE_OK;
+ return SLICE_END;
+ }
+ }
+
+ return SLICE_OK;
+}
+
+
+static int mpeg4_decode_gop_header(MpegEncContext * s, GetBitContext *gb){
+ int hours, minutes, seconds;
+
+ hours= get_bits(gb, 5);
+ minutes= get_bits(gb, 6);
+ skip_bits1(gb);
+ seconds= get_bits(gb, 6);
+
+ s->time_base= seconds + 60*(minutes + 60*hours);
+
+ skip_bits1(gb);
+ skip_bits1(gb);
+
+ return 0;
+}
+
+static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
+ int width, height, vo_ver_id;
+
+ /* vol header */
+ skip_bits(gb, 1); /* random access */
+ s->vo_type= get_bits(gb, 8);
+ if (get_bits1(gb) != 0) { /* is_ol_id */
+ vo_ver_id = get_bits(gb, 4); /* vo_ver_id */
+ skip_bits(gb, 3); /* vo_priority */
+ } else {
+ vo_ver_id = 1;
+ }
+ s->aspect_ratio_info= get_bits(gb, 4);
+ if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
+ s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
+ s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
+ }else{
+ s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
+ }
+
+ if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */
+ int chroma_format= get_bits(gb, 2);
+ if(chroma_format!=CHROMA_420){
+ av_log(s->avctx, AV_LOG_ERROR, "illegal chroma format\n");
+ }
+ s->low_delay= get_bits1(gb);
+ if(get_bits1(gb)){ /* vbv parameters */
+ get_bits(gb, 15); /* first_half_bitrate */
+ skip_bits1(gb); /* marker */
+ get_bits(gb, 15); /* latter_half_bitrate */
+ skip_bits1(gb); /* marker */
+ get_bits(gb, 15); /* first_half_vbv_buffer_size */
+ skip_bits1(gb); /* marker */
+ get_bits(gb, 3); /* latter_half_vbv_buffer_size */
+ get_bits(gb, 11); /* first_half_vbv_occupancy */
+ skip_bits1(gb); /* marker */
+ get_bits(gb, 15); /* latter_half_vbv_occupancy */
+ skip_bits1(gb); /* marker */
+ }
+ }else{
+ // set low delay flag only once the smartest? low delay detection won't be overriden
+ if(s->picture_number==0)
+ s->low_delay=0;
+ }
+
+ s->shape = get_bits(gb, 2); /* vol shape */
+ if(s->shape != RECT_SHAPE) av_log(s->avctx, AV_LOG_ERROR, "only rectangular vol supported\n");
+ if(s->shape == GRAY_SHAPE && vo_ver_id != 1){
+ av_log(s->avctx, AV_LOG_ERROR, "Gray shape not supported\n");
+ skip_bits(gb, 4); //video_object_layer_shape_extension
+ }
+
+ check_marker(gb, "before time_increment_resolution");
+
+ s->avctx->time_base.den = get_bits(gb, 16);
+ if(!s->avctx->time_base.den){
+ av_log(s->avctx, AV_LOG_ERROR, "time_base.den==0\n");
+ return -1;
+ }
+
+ s->time_increment_bits = av_log2(s->avctx->time_base.den - 1) + 1;
+ if (s->time_increment_bits < 1)
+ s->time_increment_bits = 1;
+
+ check_marker(gb, "before fixed_vop_rate");
+
+ if (get_bits1(gb) != 0) { /* fixed_vop_rate */
+ s->avctx->time_base.num = get_bits(gb, s->time_increment_bits);
+ }else
+ s->avctx->time_base.num = 1;
+
+ s->t_frame=0;
+
+ if (s->shape != BIN_ONLY_SHAPE) {
+ if (s->shape == RECT_SHAPE) {
+ skip_bits1(gb); /* marker */
+ width = get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ height = get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ if(width && height && !(s->width && s->codec_tag == AV_RL32("MP4S"))){ /* they should be non zero but who knows ... */
+ s->width = width;
+ s->height = height;
+ }
+ }
+
+ s->progressive_sequence=
+ s->progressive_frame= get_bits1(gb)^1;
+ s->interlaced_dct=0;
+ if(!get_bits1(gb) && (s->avctx->debug & FF_DEBUG_PICT_INFO))
+ av_log(s->avctx, AV_LOG_INFO, "MPEG4 OBMC not supported (very likely buggy encoder)\n"); /* OBMC Disable */
+ if (vo_ver_id == 1) {
+ s->vol_sprite_usage = get_bits1(gb); /* vol_sprite_usage */
+ } else {
+ s->vol_sprite_usage = get_bits(gb, 2); /* vol_sprite_usage */
+ }
+ if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "Static Sprites not supported\n");
+ if(s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE){
+ if(s->vol_sprite_usage==STATIC_SPRITE){
+ s->sprite_width = get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ s->sprite_height= get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ s->sprite_left = get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ s->sprite_top = get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ }
+ s->num_sprite_warping_points= get_bits(gb, 6);
+ if(s->num_sprite_warping_points > 3){
+ av_log(s->avctx, AV_LOG_ERROR, "%d sprite_warping_points\n", s->num_sprite_warping_points);
+ s->num_sprite_warping_points= 0;
+ return -1;
+ }
+ s->sprite_warping_accuracy = get_bits(gb, 2);
+ s->sprite_brightness_change= get_bits1(gb);
+ if(s->vol_sprite_usage==STATIC_SPRITE)
+ s->low_latency_sprite= get_bits1(gb);
+ }
+ // FIXME sadct disable bit if verid!=1 && shape not rect
+
+ if (get_bits1(gb) == 1) { /* not_8_bit */
+ s->quant_precision = get_bits(gb, 4); /* quant_precision */
+ if(get_bits(gb, 4)!=8) av_log(s->avctx, AV_LOG_ERROR, "N-bit not supported\n"); /* bits_per_pixel */
+ if(s->quant_precision!=5) av_log(s->avctx, AV_LOG_ERROR, "quant precision %d\n", s->quant_precision);
+ } else {
+ s->quant_precision = 5;
+ }
+
+ // FIXME a bunch of grayscale shape things
+
+ if((s->mpeg_quant=get_bits1(gb))){ /* vol_quant_type */
+ int i, v;
+
+ /* load default matrixes */
+ for(i=0; i<64; i++){
+ int j= s->dsp.idct_permutation[i];
+ v= ff_mpeg4_default_intra_matrix[i];
+ s->intra_matrix[j]= v;
+ s->chroma_intra_matrix[j]= v;
+
+ v= ff_mpeg4_default_non_intra_matrix[i];
+ s->inter_matrix[j]= v;
+ s->chroma_inter_matrix[j]= v;
+ }
+
+ /* load custom intra matrix */
+ if(get_bits1(gb)){
+ int last=0;
+ for(i=0; i<64; i++){
+ int j;
+ v= get_bits(gb, 8);
+ if(v==0) break;
+
+ last= v;
+ j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
+ s->intra_matrix[j]= v;
+ s->chroma_intra_matrix[j]= v;
+ }
+
+ /* replicate last value */
+ for(; i<64; i++){
+ int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
+ s->intra_matrix[j]= last;
+ s->chroma_intra_matrix[j]= last;
+ }
+ }
+
+ /* load custom non intra matrix */
+ if(get_bits1(gb)){
+ int last=0;
+ for(i=0; i<64; i++){
+ int j;
+ v= get_bits(gb, 8);
+ if(v==0) break;
+
+ last= v;
+ j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
+ s->inter_matrix[j]= v;
+ s->chroma_inter_matrix[j]= v;
+ }
+
+ /* replicate last value */
+ for(; i<64; i++){
+ int j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ];
+ s->inter_matrix[j]= last;
+ s->chroma_inter_matrix[j]= last;
+ }
+ }
+
+ // FIXME a bunch of grayscale shape things
+ }
+
+ if(vo_ver_id != 1)
+ s->quarter_sample= get_bits1(gb);
+ else s->quarter_sample=0;
+
+ if(!get_bits1(gb)){
+ int pos= get_bits_count(gb);
+ int estimation_method= get_bits(gb, 2);
+ if(estimation_method<2){
+ if(!get_bits1(gb)){
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //opaque
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //transparent
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_cae
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //inter_cae
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //no_update
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //upampling
+ }
+ if(!get_bits1(gb)){
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //intra_blocks
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter_blocks
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //inter4v_blocks
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //not coded blocks
+ }
+ if(!check_marker(gb, "in complexity estimation part 1")){
+ skip_bits_long(gb, pos - get_bits_count(gb));
+ goto no_cplx_est;
+ }
+ if(!get_bits1(gb)){
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_coeffs
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //dct_lines
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //vlc_syms
+ s->cplx_estimation_trash_i += 4*get_bits1(gb); //vlc_bits
+ }
+ if(!get_bits1(gb)){
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //apm
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //npm
+ s->cplx_estimation_trash_b += 8*get_bits1(gb); //interpolate_mc_q
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //forwback_mc_q
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel2
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //halfpel4
+ }
+ if(!check_marker(gb, "in complexity estimation part 2")){
+ skip_bits_long(gb, pos - get_bits_count(gb));
+ goto no_cplx_est;
+ }
+ if(estimation_method==1){
+ s->cplx_estimation_trash_i += 8*get_bits1(gb); //sadct
+ s->cplx_estimation_trash_p += 8*get_bits1(gb); //qpel
+ }
+ }else
+ av_log(s->avctx, AV_LOG_ERROR, "Invalid Complexity estimation method %d\n", estimation_method);
+ }else{
+no_cplx_est:
+ s->cplx_estimation_trash_i=
+ s->cplx_estimation_trash_p=
+ s->cplx_estimation_trash_b= 0;
+ }
+
+ s->resync_marker= !get_bits1(gb); /* resync_marker_disabled */
+
+ s->data_partitioning= get_bits1(gb);
+ if(s->data_partitioning){
+ s->rvlc= get_bits1(gb);
+ }
+
+ if(vo_ver_id != 1) {
+ s->new_pred= get_bits1(gb);
+ if(s->new_pred){
+ av_log(s->avctx, AV_LOG_ERROR, "new pred not supported\n");
+ skip_bits(gb, 2); /* requested upstream message type */
+ skip_bits1(gb); /* newpred segment type */
+ }
+ s->reduced_res_vop= get_bits1(gb);
+ if(s->reduced_res_vop) av_log(s->avctx, AV_LOG_ERROR, "reduced resolution VOP not supported\n");
+ }
+ else{
+ s->new_pred=0;
+ s->reduced_res_vop= 0;
+ }
+
+ s->scalability= get_bits1(gb);
+
+ if (s->scalability) {
+ GetBitContext bak= *gb;
+ int ref_layer_id;
+ int ref_layer_sampling_dir;
+ int h_sampling_factor_n;
+ int h_sampling_factor_m;
+ int v_sampling_factor_n;
+ int v_sampling_factor_m;
+
+ s->hierachy_type= get_bits1(gb);
+ ref_layer_id= get_bits(gb, 4);
+ ref_layer_sampling_dir= get_bits1(gb);
+ h_sampling_factor_n= get_bits(gb, 5);
+ h_sampling_factor_m= get_bits(gb, 5);
+ v_sampling_factor_n= get_bits(gb, 5);
+ v_sampling_factor_m= get_bits(gb, 5);
+ s->enhancement_type= get_bits1(gb);
+
+ if( h_sampling_factor_n==0 || h_sampling_factor_m==0
+ || v_sampling_factor_n==0 || v_sampling_factor_m==0){
+ /* illegal scalability header (VERY broken encoder),
+ * trying to workaround */
+ s->scalability=0;
+ *gb= bak;
+ }else
+ av_log(s->avctx, AV_LOG_ERROR, "scalability not supported\n");
+
+ // bin shape stuff FIXME
+ }
+ }
+ return 0;
+}
+
+/**
+ * decodes the user data stuff in the header.
+ * Also initializes divx/xvid/lavc_version/build.
+ */
+static int decode_user_data(MpegEncContext *s, GetBitContext *gb){
+ char buf[256];
+ int i;
+ int e;
+ int ver = 0, build = 0, ver2 = 0, ver3 = 0;
+ char last;
+
+ for(i=0; i<255 && get_bits_count(gb) < gb->size_in_bits; i++){
+ if(show_bits(gb, 23) == 0) break;
+ buf[i]= get_bits(gb, 8);
+ }
+ buf[i]=0;
+
+ /* divx detection */
+ e=sscanf(buf, "DivX%dBuild%d%c", &ver, &build, &last);
+ if(e<2)
+ e=sscanf(buf, "DivX%db%d%c", &ver, &build, &last);
+ if(e>=2){
+ s->divx_version= ver;
+ s->divx_build= build;
+ s->divx_packed= e==3 && last=='p';
+ if(s->divx_packed && !s->showed_packed_warning) {
+ av_log(s->avctx, AV_LOG_WARNING, "Invalid and inefficient vfw-avi packed B frames detected\n");
+ s->showed_packed_warning=1;
+ }
+ }
+
+ /* ffmpeg detection */
+ e=sscanf(buf, "FFmpe%*[^b]b%d", &build)+3;
+ if(e!=4)
+ e=sscanf(buf, "FFmpeg v%d.%d.%d / libavcodec build: %d", &ver, &ver2, &ver3, &build);
+ if(e!=4){
+ e=sscanf(buf, "Lavc%d.%d.%d", &ver, &ver2, &ver3)+1;
+ if (e>1)
+ build= (ver<<16) + (ver2<<8) + ver3;
+ }
+ if(e!=4){
+ if(strcmp(buf, "ffmpeg")==0){
+ s->lavc_build= 4600;
+ }
+ }
+ if(e==4){
+ s->lavc_build= build;
+ }
+
+ /* Xvid detection */
+ e=sscanf(buf, "XviD%d", &build);
+ if(e==1){
+ s->xvid_build= build;
+ }
+
+ return 0;
+}
+
+static int decode_vop_header(MpegEncContext *s, GetBitContext *gb){
+ int time_incr, time_increment;
+
+ s->pict_type = get_bits(gb, 2) + FF_I_TYPE; /* pict type: I = 0 , P = 1 */
+ if(s->pict_type==FF_B_TYPE && s->low_delay && s->vol_control_parameters==0 && !(s->flags & CODEC_FLAG_LOW_DELAY)){
+ av_log(s->avctx, AV_LOG_ERROR, "low_delay flag incorrectly, clearing it\n");
+ s->low_delay=0;
+ }
+
+ s->partitioned_frame= s->data_partitioning && s->pict_type!=FF_B_TYPE;
+ if(s->partitioned_frame)
+ s->decode_mb= mpeg4_decode_partitioned_mb;
+ else
+ s->decode_mb= mpeg4_decode_mb;
+
+ time_incr=0;
+ while (get_bits1(gb) != 0)
+ time_incr++;
+
+ check_marker(gb, "before time_increment");
+
+ if(s->time_increment_bits==0 || !(show_bits(gb, s->time_increment_bits+1)&1)){
+ av_log(s->avctx, AV_LOG_ERROR, "hmm, seems the headers are not complete, trying to guess time_increment_bits\n");
+
+ for(s->time_increment_bits=1 ;s->time_increment_bits<16; s->time_increment_bits++){
+ if ( s->pict_type == FF_P_TYPE
+ || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE)) {
+ if((show_bits(gb, s->time_increment_bits+6)&0x37) == 0x30) break;
+ }else
+ if((show_bits(gb, s->time_increment_bits+5)&0x1F) == 0x18) break;
+ }
+
+ av_log(s->avctx, AV_LOG_ERROR, "my guess is %d bits ;)\n",s->time_increment_bits);
+ }
+
+ if(IS_3IV1) time_increment= get_bits1(gb); //FIXME investigate further
+ else time_increment= get_bits(gb, s->time_increment_bits);
+
+ if(s->pict_type!=FF_B_TYPE){
+ s->last_time_base= s->time_base;
+ s->time_base+= time_incr;
+ s->time= s->time_base*s->avctx->time_base.den + time_increment;
+ if(s->workaround_bugs&FF_BUG_UMP4){
+ if(s->time < s->last_non_b_time){
+ /* header is not mpeg-4-compatible, broken encoder,
+ * trying to workaround */
+ s->time_base++;
+ s->time+= s->avctx->time_base.den;
+ }
+ }
+ s->pp_time= s->time - s->last_non_b_time;
+ s->last_non_b_time= s->time;
+ }else{
+ s->time= (s->last_time_base + time_incr)*s->avctx->time_base.den + time_increment;
+ s->pb_time= s->pp_time - (s->last_non_b_time - s->time);
+ if(s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0){
+ /* messed up order, maybe after seeking? skipping current b-frame */
+ return FRAME_SKIPPED;
+ }
+ ff_mpeg4_init_direct_mv(s);
+
+ if(s->t_frame==0) s->t_frame= s->pb_time;
+ if(s->t_frame==0) s->t_frame=1; // 1/0 protection
+ s->pp_field_time= ( ROUNDED_DIV(s->last_non_b_time, s->t_frame)
+ - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
+ s->pb_field_time= ( ROUNDED_DIV(s->time, s->t_frame)
+ - ROUNDED_DIV(s->last_non_b_time - s->pp_time, s->t_frame))*2;
+ if(!s->progressive_sequence){
+ if(s->pp_field_time <= s->pb_field_time || s->pb_field_time <= 1)
+ return FRAME_SKIPPED;
+ }
+ }
+
+ if(s->avctx->time_base.num)
+ s->current_picture_ptr->pts= (s->time + s->avctx->time_base.num/2) / s->avctx->time_base.num;
+ else
+ s->current_picture_ptr->pts= AV_NOPTS_VALUE;
+ if(s->avctx->debug&FF_DEBUG_PTS)
+ av_log(s->avctx, AV_LOG_DEBUG, "MPEG4 PTS: %"PRId64"\n", s->current_picture_ptr->pts);
+
+ check_marker(gb, "before vop_coded");
+
+ /* vop coded */
+ if (get_bits1(gb) != 1){
+ if(s->avctx->debug&FF_DEBUG_PICT_INFO)
+ av_log(s->avctx, AV_LOG_ERROR, "vop not coded\n");
+ return FRAME_SKIPPED;
+ }
+ if (s->shape != BIN_ONLY_SHAPE && ( s->pict_type == FF_P_TYPE
+ || (s->pict_type == FF_S_TYPE && s->vol_sprite_usage==GMC_SPRITE))) {
+ /* rounding type for motion estimation */
+ s->no_rounding = get_bits1(gb);
+ } else {
+ s->no_rounding = 0;
+ }
+//FIXME reduced res stuff
+
+ if (s->shape != RECT_SHAPE) {
+ if (s->vol_sprite_usage != 1 || s->pict_type != FF_I_TYPE) {
+ int width, height, hor_spat_ref, ver_spat_ref;
+
+ width = get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ height = get_bits(gb, 13);
+ skip_bits1(gb); /* marker */
+ hor_spat_ref = get_bits(gb, 13); /* hor_spat_ref */
+ skip_bits1(gb); /* marker */
+ ver_spat_ref = get_bits(gb, 13); /* ver_spat_ref */
+ }
+ skip_bits1(gb); /* change_CR_disable */
+
+ if (get_bits1(gb) != 0) {
+ skip_bits(gb, 8); /* constant_alpha_value */
+ }
+ }
+//FIXME complexity estimation stuff
+
+ if (s->shape != BIN_ONLY_SHAPE) {
+ skip_bits_long(gb, s->cplx_estimation_trash_i);
+ if(s->pict_type != FF_I_TYPE)
+ skip_bits_long(gb, s->cplx_estimation_trash_p);
+ if(s->pict_type == FF_B_TYPE)
+ skip_bits_long(gb, s->cplx_estimation_trash_b);
+
+ s->intra_dc_threshold= mpeg4_dc_threshold[ get_bits(gb, 3) ];
+ if(!s->progressive_sequence){
+ s->top_field_first= get_bits1(gb);
+ s->alternate_scan= get_bits1(gb);
+ }else
+ s->alternate_scan= 0;
+ }
+
+ if(s->alternate_scan){
+ ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan);
+ ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan);
+ ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_vertical_scan);
+ ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
+ } else{
+ ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct);
+ ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct);
+ ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_alternate_horizontal_scan);
+ ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_alternate_vertical_scan);
+ }
+
+ if(s->pict_type == FF_S_TYPE && (s->vol_sprite_usage==STATIC_SPRITE || s->vol_sprite_usage==GMC_SPRITE)){
+ mpeg4_decode_sprite_trajectory(s, gb);
+ if(s->sprite_brightness_change) av_log(s->avctx, AV_LOG_ERROR, "sprite_brightness_change not supported\n");
+ if(s->vol_sprite_usage==STATIC_SPRITE) av_log(s->avctx, AV_LOG_ERROR, "static sprite not supported\n");
+ }
+
+ if (s->shape != BIN_ONLY_SHAPE) {
+ s->chroma_qscale= s->qscale = get_bits(gb, s->quant_precision);
+ if(s->qscale==0){
+ av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (qscale=0)\n");
+ return -1; // makes no sense to continue, as there is nothing left from the image then
+ }
+
+ if (s->pict_type != FF_I_TYPE) {
+ s->f_code = get_bits(gb, 3); /* fcode_for */
+ if(s->f_code==0){
+ av_log(s->avctx, AV_LOG_ERROR, "Error, header damaged or not MPEG4 header (f_code=0)\n");
+ return -1; // makes no sense to continue, as the MV decoding will break very quickly
+ }
+ }else
+ s->f_code=1;
+
+ if (s->pict_type == FF_B_TYPE) {
+ s->b_code = get_bits(gb, 3);
+ }else
+ s->b_code=1;
+
+ if(s->avctx->debug&FF_DEBUG_PICT_INFO){
+ av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%d,%d %s size:%d pro:%d alt:%d top:%d %spel part:%d resync:%d w:%d a:%d rnd:%d vot:%d%s dc:%d ce:%d/%d/%d\n",
+ s->qscale, s->f_code, s->b_code,
+ s->pict_type == FF_I_TYPE ? "I" : (s->pict_type == FF_P_TYPE ? "P" : (s->pict_type == FF_B_TYPE ? "B" : "S")),
+ gb->size_in_bits,s->progressive_sequence, s->alternate_scan, s->top_field_first,
+ s->quarter_sample ? "q" : "h", s->data_partitioning, s->resync_marker, s->num_sprite_warping_points,
+ s->sprite_warping_accuracy, 1-s->no_rounding, s->vo_type, s->vol_control_parameters ? " VOLC" : " ", s->intra_dc_threshold, s->cplx_estimation_trash_i, s->cplx_estimation_trash_p, s->cplx_estimation_trash_b);
+ }
+
+ if(!s->scalability){
+ if (s->shape!=RECT_SHAPE && s->pict_type!=FF_I_TYPE) {
+ skip_bits1(gb); // vop shape coding type
+ }
+ }else{
+ if(s->enhancement_type){
+ int load_backward_shape= get_bits1(gb);
+ if(load_backward_shape){
+ av_log(s->avctx, AV_LOG_ERROR, "load backward shape isn't supported\n");
+ }
+ }
+ skip_bits(gb, 2); //ref_select_code
+ }
+ }
+ /* detect buggy encoders which don't set the low_delay flag (divx4/xvid/opendivx)*/
+ // note we cannot detect divx5 without b-frames easily (although it's buggy too)
+ if(s->vo_type==0 && s->vol_control_parameters==0 && s->divx_version==0 && s->picture_number==0){
+ av_log(s->avctx, AV_LOG_ERROR, "looks like this file was encoded with (divx4/(old)xvid/opendivx) -> forcing low_delay flag\n");
+ s->low_delay=1;
+ }
+
+ s->picture_number++; // better than pic number==0 always ;)
+
+ s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table; //FIXME add short header support
+ s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
+
+ if(s->workaround_bugs&FF_BUG_EDGE){
+ s->h_edge_pos= s->width;
+ s->v_edge_pos= s->height;
+ }
+ return 0;
+}
+
+/**
+ * decode mpeg4 headers
+ * @return <0 if no VOP found (or a damaged one)
+ * FRAME_SKIPPED if a not coded VOP is found
+ * 0 if a VOP is found
+ */
+int ff_mpeg4_decode_picture_header(MpegEncContext * s, GetBitContext *gb)
+{
+ int startcode, v;
+
+ /* search next start code */
+ align_get_bits(gb);
+
+ if(s->codec_tag == AV_RL32("WV1F") && show_bits(gb, 24) == 0x575630){
+ skip_bits(gb, 24);
+ if(get_bits(gb, 8) == 0xF0)
+ goto end;
+ }
+
+ startcode = 0xff;
+ for(;;) {
+ if(get_bits_count(gb) >= gb->size_in_bits){
+ if(gb->size_in_bits==8 && (s->divx_version || s->xvid_build)){
+ av_log(s->avctx, AV_LOG_ERROR, "frame skip %d\n", gb->size_in_bits);
+ return FRAME_SKIPPED; //divx bug
+ }else
+ return -1; //end of stream
+ }
+
+ /* use the bits after the test */
+ v = get_bits(gb, 8);
+ startcode = ((startcode << 8) | v) & 0xffffffff;
+
+ if((startcode&0xFFFFFF00) != 0x100)
+ continue; //no startcode
+
+ if(s->avctx->debug&FF_DEBUG_STARTCODE){
+ av_log(s->avctx, AV_LOG_DEBUG, "startcode: %3X ", startcode);
+ if (startcode<=0x11F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Start");
+ else if(startcode<=0x12F) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Layer Start");
+ else if(startcode<=0x13F) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
+ else if(startcode<=0x15F) av_log(s->avctx, AV_LOG_DEBUG, "FGS bp start");
+ else if(startcode<=0x1AF) av_log(s->avctx, AV_LOG_DEBUG, "Reserved");
+ else if(startcode==0x1B0) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq Start");
+ else if(startcode==0x1B1) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Seq End");
+ else if(startcode==0x1B2) av_log(s->avctx, AV_LOG_DEBUG, "User Data");
+ else if(startcode==0x1B3) av_log(s->avctx, AV_LOG_DEBUG, "Group of VOP start");
+ else if(startcode==0x1B4) av_log(s->avctx, AV_LOG_DEBUG, "Video Session Error");
+ else if(startcode==0x1B5) av_log(s->avctx, AV_LOG_DEBUG, "Visual Object Start");
+ else if(startcode==0x1B6) av_log(s->avctx, AV_LOG_DEBUG, "Video Object Plane start");
+ else if(startcode==0x1B7) av_log(s->avctx, AV_LOG_DEBUG, "slice start");
+ else if(startcode==0x1B8) av_log(s->avctx, AV_LOG_DEBUG, "extension start");
+ else if(startcode==0x1B9) av_log(s->avctx, AV_LOG_DEBUG, "fgs start");
+ else if(startcode==0x1BA) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object start");
+ else if(startcode==0x1BB) av_log(s->avctx, AV_LOG_DEBUG, "FBA Object Plane start");
+ else if(startcode==0x1BC) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object start");
+ else if(startcode==0x1BD) av_log(s->avctx, AV_LOG_DEBUG, "Mesh Object Plane start");
+ else if(startcode==0x1BE) av_log(s->avctx, AV_LOG_DEBUG, "Still Texture Object start");
+ else if(startcode==0x1BF) av_log(s->avctx, AV_LOG_DEBUG, "Texture Spatial Layer start");
+ else if(startcode==0x1C0) av_log(s->avctx, AV_LOG_DEBUG, "Texture SNR Layer start");
+ else if(startcode==0x1C1) av_log(s->avctx, AV_LOG_DEBUG, "Texture Tile start");
+ else if(startcode==0x1C2) av_log(s->avctx, AV_LOG_DEBUG, "Texture Shape Layer start");
+ else if(startcode==0x1C3) av_log(s->avctx, AV_LOG_DEBUG, "stuffing start");
+ else if(startcode<=0x1C5) av_log(s->avctx, AV_LOG_DEBUG, "reserved");
+ else if(startcode<=0x1FF) av_log(s->avctx, AV_LOG_DEBUG, "System start");
+ av_log(s->avctx, AV_LOG_DEBUG, " at %d\n", get_bits_count(gb));
+ }
+
+ if(startcode >= 0x120 && startcode <= 0x12F){
+ if(decode_vol_header(s, gb) < 0)
+ return -1;
+ }
+ else if(startcode == USER_DATA_STARTCODE){
+ decode_user_data(s, gb);
+ }
+ else if(startcode == GOP_STARTCODE){
+ mpeg4_decode_gop_header(s, gb);
+ }
+ else if(startcode == VOP_STARTCODE){
+ break;
+ }
+
+ align_get_bits(gb);
+ startcode = 0xff;
+ }
+end:
+ if(s->flags& CODEC_FLAG_LOW_DELAY)
+ s->low_delay=1;
+ s->avctx->has_b_frames= !s->low_delay;
+ return decode_vop_header(s, gb);
+}
+
+static av_cold int decode_init(AVCodecContext *avctx)
+{
+ MpegEncContext *s = avctx->priv_data;
+ int ret;
+ static int done = 0;
+
+ if((ret=ff_h263_decode_init(avctx)) < 0)
+ return ret;
+
+ if (!done) {
+ done = 1;
+
+ init_rl(&rl_intra, ff_mpeg4_static_rl_table_store[0]);
+ init_rl(&rvlc_rl_inter, ff_mpeg4_static_rl_table_store[1]);
+ init_rl(&rvlc_rl_intra, ff_mpeg4_static_rl_table_store[2]);
+ INIT_VLC_RL(rl_intra, 554);
+ INIT_VLC_RL(rvlc_rl_inter, 1072);
+ INIT_VLC_RL(rvlc_rl_intra, 1072);
+ INIT_VLC_STATIC(&dc_lum, DC_VLC_BITS, 10 /* 13 */,
+ &DCtab_lum[0][1], 2, 1,
+ &DCtab_lum[0][0], 2, 1, 512);
+ INIT_VLC_STATIC(&dc_chrom, DC_VLC_BITS, 10 /* 13 */,
+ &DCtab_chrom[0][1], 2, 1,
+ &DCtab_chrom[0][0], 2, 1, 512);
+ INIT_VLC_STATIC(&sprite_trajectory, SPRITE_TRAJ_VLC_BITS, 15,
+ &sprite_trajectory_tab[0][1], 4, 2,
+ &sprite_trajectory_tab[0][0], 4, 2, 128);
+ INIT_VLC_STATIC(&mb_type_b_vlc, MB_TYPE_B_VLC_BITS, 4,
+ &mb_type_b_tab[0][1], 2, 1,
+ &mb_type_b_tab[0][0], 2, 1, 16);
+ }
+
+ s->h263_pred = 1;
+ s->low_delay = 0; //default, might be overriden in the vol header during header parsing
+ s->decode_mb= mpeg4_decode_mb;
+ s->time_increment_bits = 4; /* default value for broken headers */
+ avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
+
+ return 0;
+}
+
+AVCodec mpeg4_decoder = {
+ "mpeg4",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_MPEG4,
+ sizeof(MpegEncContext),
+ decode_init,
+ NULL,
+ ff_h263_decode_end,
+ ff_h263_decode_frame,
+ CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
+ .flush= ff_mpeg_flush,
+ .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2"),
+ .pix_fmts= ff_hwaccel_pixfmt_list_420,
+};
+
+
+#if CONFIG_MPEG4_VDPAU_DECODER
+AVCodec mpeg4_vdpau_decoder = {
+ "mpeg4_vdpau",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_MPEG4,
+ sizeof(MpegEncContext),
+ decode_init,
+ NULL,
+ ff_h263_decode_end,
+ ff_h263_decode_frame,
+ CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY | CODEC_CAP_HWACCEL_VDPAU,
+ .long_name= NULL_IF_CONFIG_SMALL("MPEG-4 part 2 (VDPAU)"),
+ .pix_fmts= (const enum PixelFormat[]){PIX_FMT_VDPAU_MPEG4, PIX_FMT_NONE},
+};
+#endif
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-08 14:34:06 +0000