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Diffstat (limited to 'ffmpeg/libavcodec/ituh263dec.c')
-rw-r--r--ffmpeg/libavcodec/ituh263dec.c1135
1 files changed, 0 insertions, 1135 deletions
diff --git a/ffmpeg/libavcodec/ituh263dec.c b/ffmpeg/libavcodec/ituh263dec.c
deleted file mode 100644
index 71e36c1..0000000
--- a/ffmpeg/libavcodec/ituh263dec.c
+++ /dev/null
@@ -1,1135 +0,0 @@
-/*
- * ITU H263 bitstream 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 decoder.
- */
-
-#define UNCHECKED_BITSTREAM_READER 1
-#include <limits.h>
-
-#include "libavutil/attributes.h"
-#include "libavutil/internal.h"
-#include "libavutil/mathematics.h"
-#include "avcodec.h"
-#include "mpegvideo.h"
-#include "h263.h"
-#include "mathops.h"
-#include "unary.h"
-#include "flv.h"
-#include "mpeg4video.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 MV_VLC_BITS 9
-#define H263_MBTYPE_B_VLC_BITS 6
-#define CBPC_B_VLC_BITS 3
-
-static const int h263_mb_type_b_map[15]= {
- MB_TYPE_DIRECT2 | MB_TYPE_L0L1,
- MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP,
- MB_TYPE_DIRECT2 | MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT,
- MB_TYPE_L0 | MB_TYPE_16x16,
- MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_16x16,
- MB_TYPE_L0 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
- MB_TYPE_L1 | MB_TYPE_16x16,
- MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_16x16,
- MB_TYPE_L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
- MB_TYPE_L0L1 | MB_TYPE_16x16,
- MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_16x16,
- MB_TYPE_L0L1 | MB_TYPE_CBP | MB_TYPE_QUANT | MB_TYPE_16x16,
- 0, //stuffing
- MB_TYPE_INTRA4x4 | MB_TYPE_CBP,
- MB_TYPE_INTRA4x4 | MB_TYPE_CBP | MB_TYPE_QUANT,
-};
-
-void ff_h263_show_pict_info(MpegEncContext *s){
- if(s->avctx->debug&FF_DEBUG_PICT_INFO){
- av_log(s->avctx, AV_LOG_DEBUG, "qp:%d %c size:%d rnd:%d%s%s%s%s%s%s%s%s%s %d/%d\n",
- s->qscale, av_get_picture_type_char(s->pict_type),
- s->gb.size_in_bits, 1-s->no_rounding,
- s->obmc ? " AP" : "",
- s->umvplus ? " UMV" : "",
- s->h263_long_vectors ? " LONG" : "",
- s->h263_plus ? " +" : "",
- s->h263_aic ? " AIC" : "",
- s->alt_inter_vlc ? " AIV" : "",
- s->modified_quant ? " MQ" : "",
- s->loop_filter ? " LOOP" : "",
- s->h263_slice_structured ? " SS" : "",
- s->avctx->time_base.den, s->avctx->time_base.num
- );
- }
-}
-
-/***********************************************/
-/* decoding */
-
-VLC ff_h263_intra_MCBPC_vlc;
-VLC ff_h263_inter_MCBPC_vlc;
-VLC ff_h263_cbpy_vlc;
-static VLC mv_vlc;
-static VLC h263_mbtype_b_vlc;
-static VLC cbpc_b_vlc;
-
-/* init vlcs */
-
-/* XXX: find a better solution to handle static init */
-av_cold void ff_h263_decode_init_vlc(void)
-{
- static volatile int done = 0;
-
- if (!done) {
- INIT_VLC_STATIC(&ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 9,
- ff_h263_intra_MCBPC_bits, 1, 1,
- ff_h263_intra_MCBPC_code, 1, 1, 72);
- INIT_VLC_STATIC(&ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 28,
- ff_h263_inter_MCBPC_bits, 1, 1,
- ff_h263_inter_MCBPC_code, 1, 1, 198);
- INIT_VLC_STATIC(&ff_h263_cbpy_vlc, CBPY_VLC_BITS, 16,
- &ff_h263_cbpy_tab[0][1], 2, 1,
- &ff_h263_cbpy_tab[0][0], 2, 1, 64);
- INIT_VLC_STATIC(&mv_vlc, MV_VLC_BITS, 33,
- &ff_mvtab[0][1], 2, 1,
- &ff_mvtab[0][0], 2, 1, 538);
- ff_init_rl(&ff_h263_rl_inter, ff_h263_static_rl_table_store[0]);
- ff_init_rl(&ff_rl_intra_aic, ff_h263_static_rl_table_store[1]);
- INIT_VLC_RL(ff_h263_rl_inter, 554);
- INIT_VLC_RL(ff_rl_intra_aic, 554);
- INIT_VLC_STATIC(&h263_mbtype_b_vlc, H263_MBTYPE_B_VLC_BITS, 15,
- &ff_h263_mbtype_b_tab[0][1], 2, 1,
- &ff_h263_mbtype_b_tab[0][0], 2, 1, 80);
- INIT_VLC_STATIC(&cbpc_b_vlc, CBPC_B_VLC_BITS, 4,
- &ff_cbpc_b_tab[0][1], 2, 1,
- &ff_cbpc_b_tab[0][0], 2, 1, 8);
- done = 1;
- }
-}
-
-int ff_h263_decode_mba(MpegEncContext *s)
-{
- int i, mb_pos;
-
- for(i=0; i<6; i++){
- if(s->mb_num-1 <= ff_mba_max[i]) break;
- }
- mb_pos= get_bits(&s->gb, ff_mba_length[i]);
- s->mb_x= mb_pos % s->mb_width;
- s->mb_y= mb_pos / s->mb_width;
-
- return mb_pos;
-}
-
-/**
- * Decode the group of blocks header or slice header.
- * @return <0 if an error occurred
- */
-static int h263_decode_gob_header(MpegEncContext *s)
-{
- unsigned int val, gob_number;
- int left;
-
- /* Check for GOB Start Code */
- val = show_bits(&s->gb, 16);
- if(val)
- return -1;
-
- /* We have a GBSC probably with GSTUFF */
- skip_bits(&s->gb, 16); /* Drop the zeros */
- left= get_bits_left(&s->gb);
- //MN: we must check the bits left or we might end in a infinite loop (or segfault)
- for(;left>13; left--){
- if(get_bits1(&s->gb)) break; /* Seek the '1' bit */
- }
- if(left<=13)
- return -1;
-
- if(s->h263_slice_structured){
- if(get_bits1(&s->gb)==0)
- return -1;
-
- ff_h263_decode_mba(s);
-
- if(s->mb_num > 1583)
- if(get_bits1(&s->gb)==0)
- return -1;
-
- s->qscale = get_bits(&s->gb, 5); /* SQUANT */
- if(get_bits1(&s->gb)==0)
- return -1;
- skip_bits(&s->gb, 2); /* GFID */
- }else{
- gob_number = get_bits(&s->gb, 5); /* GN */
- s->mb_x= 0;
- s->mb_y= s->gob_index* gob_number;
- skip_bits(&s->gb, 2); /* GFID */
- s->qscale = get_bits(&s->gb, 5); /* GQUANT */
- }
-
- if(s->mb_y >= s->mb_height)
- return -1;
-
- if(s->qscale==0)
- return -1;
-
- return 0;
-}
-
-/**
- * Decode the group of blocks / video packet header.
- * @return bit position of the resync_marker, or <0 if none was found
- */
-int ff_h263_resync(MpegEncContext *s){
- int left, pos, ret;
-
- if(s->codec_id==AV_CODEC_ID_MPEG4){
- skip_bits1(&s->gb);
- align_get_bits(&s->gb);
- }
-
- if(show_bits(&s->gb, 16)==0){
- pos= get_bits_count(&s->gb);
- if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
- ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
- else
- ret= h263_decode_gob_header(s);
- if(ret>=0)
- return pos;
- }
- //OK, it's not where it is supposed to be ...
- s->gb= s->last_resync_gb;
- align_get_bits(&s->gb);
- left= get_bits_left(&s->gb);
-
- for(;left>16+1+5+5; left-=8){
- if(show_bits(&s->gb, 16)==0){
- GetBitContext bak= s->gb;
-
- pos= get_bits_count(&s->gb);
- if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4)
- ret= ff_mpeg4_decode_video_packet_header(s->avctx->priv_data);
- else
- ret= h263_decode_gob_header(s);
- if(ret>=0)
- return pos;
-
- s->gb= bak;
- }
- skip_bits(&s->gb, 8);
- }
-
- return -1;
-}
-
-int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code)
-{
- int code, val, sign, shift;
- code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2);
-
- if (code == 0)
- return pred;
- if (code < 0)
- return 0xffff;
-
- sign = get_bits1(&s->gb);
- shift = f_code - 1;
- val = code;
- if (shift) {
- val = (val - 1) << shift;
- val |= get_bits(&s->gb, shift);
- val++;
- }
- if (sign)
- val = -val;
- val += pred;
-
- /* modulo decoding */
- if (!s->h263_long_vectors) {
- val = sign_extend(val, 5 + f_code);
- } else {
- /* horrible h263 long vector mode */
- if (pred < -31 && val < -63)
- val += 64;
- if (pred > 32 && val > 63)
- val -= 64;
-
- }
- return val;
-}
-
-
-/* Decode RVLC of H.263+ UMV */
-static int h263p_decode_umotion(MpegEncContext * s, int pred)
-{
- int code = 0, sign;
-
- if (get_bits1(&s->gb)) /* Motion difference = 0 */
- return pred;
-
- code = 2 + get_bits1(&s->gb);
-
- while (get_bits1(&s->gb))
- {
- code <<= 1;
- code += get_bits1(&s->gb);
- }
- sign = code & 1;
- code >>= 1;
-
- code = (sign) ? (pred - code) : (pred + code);
- av_dlog(s->avctx,"H.263+ UMV Motion = %d\n", code);
- return code;
-
-}
-
-/**
- * read the next MVs for OBMC. yes this is a ugly hack, feel free to send a patch :)
- */
-static void preview_obmc(MpegEncContext *s){
- GetBitContext gb= s->gb;
-
- int cbpc, i, pred_x, pred_y, mx, my;
- int16_t *mot_val;
- const int xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
- const int stride= s->b8_stride*2;
-
- for(i=0; i<4; i++)
- s->block_index[i]+= 2;
- for(i=4; i<6; i++)
- s->block_index[i]+= 1;
- s->mb_x++;
-
- av_assert2(s->pict_type == AV_PICTURE_TYPE_P);
-
- do{
- if (get_bits1(&s->gb)) {
- /* skip mb */
- mot_val = s->current_picture.motion_val[0][s->block_index[0]];
- 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;
-
- s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- goto end;
- }
- cbpc = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc.table, INTER_MCBPC_VLC_BITS, 2);
- }while(cbpc == 20);
-
- if(cbpc & 4){
- s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
- }else{
- get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
- if (cbpc & 8) {
- if(s->modified_quant){
- if(get_bits1(&s->gb)) skip_bits(&s->gb, 1);
- else skip_bits(&s->gb, 5);
- }else
- skip_bits(&s->gb, 2);
- }
-
- if ((cbpc & 16) == 0) {
- s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
- /* 16x16 motion prediction */
- mot_val= ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = ff_h263_decode_motion(s, pred_x, 1);
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = ff_h263_decode_motion(s, pred_y, 1);
-
- 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 {
- s->current_picture.mb_type[xy] = MB_TYPE_8x8 | MB_TYPE_L0;
- for(i=0;i<4;i++) {
- mot_val = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = ff_h263_decode_motion(s, pred_x, 1);
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = ff_h263_decode_motion(s, pred_y, 1);
- if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
- skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
- mot_val[0] = mx;
- mot_val[1] = my;
- }
- }
- }
-end:
-
- for(i=0; i<4; i++)
- s->block_index[i]-= 2;
- for(i=4; i<6; i++)
- s->block_index[i]-= 1;
- s->mb_x--;
-
- s->gb= gb;
-}
-
-static void h263_decode_dquant(MpegEncContext *s){
- static const int8_t quant_tab[4] = { -1, -2, 1, 2 };
-
- if(s->modified_quant){
- if(get_bits1(&s->gb))
- s->qscale= ff_modified_quant_tab[get_bits1(&s->gb)][ s->qscale ];
- else
- s->qscale= get_bits(&s->gb, 5);
- }else
- s->qscale += quant_tab[get_bits(&s->gb, 2)];
- ff_set_qscale(s, s->qscale);
-}
-
-static int h263_decode_block(MpegEncContext * s, int16_t * block,
- int n, int coded)
-{
- int code, level, i, j, last, run;
- RLTable *rl = &ff_h263_rl_inter;
- const uint8_t *scan_table;
- GetBitContext gb= s->gb;
-
- scan_table = s->intra_scantable.permutated;
- if (s->h263_aic && s->mb_intra) {
- rl = &ff_rl_intra_aic;
- i = 0;
- if (s->ac_pred) {
- if (s->h263_aic_dir)
- scan_table = s->intra_v_scantable.permutated; /* left */
- else
- scan_table = s->intra_h_scantable.permutated; /* top */
- }
- } else if (s->mb_intra) {
- /* DC coef */
- if(s->codec_id == AV_CODEC_ID_RV10){
-#if CONFIG_RV10_DECODER
- if (s->rv10_version == 3 && s->pict_type == AV_PICTURE_TYPE_I) {
- int component, diff;
- component = (n <= 3 ? 0 : n - 4 + 1);
- level = s->last_dc[component];
- if (s->rv10_first_dc_coded[component]) {
- diff = ff_rv_decode_dc(s, n);
- if (diff == 0xffff)
- return -1;
- level += diff;
- level = level & 0xff; /* handle wrap round */
- s->last_dc[component] = level;
- } else {
- s->rv10_first_dc_coded[component] = 1;
- }
- } else {
- level = get_bits(&s->gb, 8);
- if (level == 255)
- level = 128;
- }
-#endif
- }else{
- level = get_bits(&s->gb, 8);
- if((level&0x7F) == 0){
- av_log(s->avctx, AV_LOG_ERROR, "illegal dc %d at %d %d\n", level, s->mb_x, s->mb_y);
- if(s->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))
- return -1;
- }
- if (level == 255)
- level = 128;
- }
- block[0] = level;
- i = 1;
- } else {
- i = 0;
- }
- if (!coded) {
- if (s->mb_intra && s->h263_aic)
- goto not_coded;
- s->block_last_index[n] = i - 1;
- return 0;
- }
-retry:
- for(;;) {
- code = get_vlc2(&s->gb, rl->vlc.table, TEX_VLC_BITS, 2);
- if (code < 0){
- av_log(s->avctx, AV_LOG_ERROR, "illegal ac vlc code at %dx%d\n", s->mb_x, s->mb_y);
- return -1;
- }
- if (code == rl->n) {
- /* escape */
- if (CONFIG_FLV_DECODER && s->h263_flv > 1) {
- ff_flv2_decode_ac_esc(&s->gb, &level, &run, &last);
- } else {
- last = get_bits1(&s->gb);
- run = get_bits(&s->gb, 6);
- level = (int8_t)get_bits(&s->gb, 8);
- if(level == -128){
- if (s->codec_id == AV_CODEC_ID_RV10) {
- /* XXX: should patch encoder too */
- level = get_sbits(&s->gb, 12);
- }else{
- level = get_bits(&s->gb, 5);
- level |= get_sbits(&s->gb, 6)<<5;
- }
- }
- }
- } else {
- run = rl->table_run[code];
- level = rl->table_level[code];
- last = code >= rl->last;
- if (get_bits1(&s->gb))
- level = -level;
- }
- i += run;
- if (i >= 64){
- if(s->alt_inter_vlc && rl == &ff_h263_rl_inter && !s->mb_intra){
- //Looks like a hack but no, it's the way it is supposed to work ...
- rl = &ff_rl_intra_aic;
- i = 0;
- s->gb= gb;
- s->dsp.clear_block(block);
- goto retry;
- }
- av_log(s->avctx, AV_LOG_ERROR, "run overflow at %dx%d i:%d\n", s->mb_x, s->mb_y, s->mb_intra);
- return -1;
- }
- j = scan_table[i];
- block[j] = level;
- if (last)
- break;
- i++;
- }
-not_coded:
- if (s->mb_intra && s->h263_aic) {
- ff_h263_pred_acdc(s, block, n);
- i = 63;
- }
- s->block_last_index[n] = i;
- return 0;
-}
-
-static int h263_skip_b_part(MpegEncContext *s, int cbp)
-{
- LOCAL_ALIGNED_16(int16_t, dblock, [64]);
- int i, mbi;
- int bli[6];
-
- /* we have to set s->mb_intra to zero to decode B-part of PB-frame correctly
- * but real value should be restored in order to be used later (in OBMC condition)
- */
- mbi = s->mb_intra;
- memcpy(bli, s->block_last_index, sizeof(bli));
- s->mb_intra = 0;
- for (i = 0; i < 6; i++) {
- if (h263_decode_block(s, dblock, i, cbp&32) < 0)
- return -1;
- cbp+=cbp;
- }
- s->mb_intra = mbi;
- memcpy(s->block_last_index, bli, sizeof(bli));
- return 0;
-}
-
-static int h263_get_modb(GetBitContext *gb, int pb_frame, int *cbpb)
-{
- int c, mv = 1;
-
- if (pb_frame < 3) { // h.263 Annex G and i263 PB-frame
- c = get_bits1(gb);
- if (pb_frame == 2 && c)
- mv = !get_bits1(gb);
- } else { // h.263 Annex M improved PB-frame
- mv = get_unary(gb, 0, 4) + 1;
- c = mv & 1;
- mv = !!(mv & 2);
- }
- if(c)
- *cbpb = get_bits(gb, 6);
- return mv;
-}
-
-int ff_h263_decode_mb(MpegEncContext *s,
- int16_t block[6][64])
-{
- int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
- int16_t *mot_val;
- const int xy= s->mb_x + s->mb_y * s->mb_stride;
- int cbpb = 0, pb_mv_count = 0;
-
- av_assert2(!s->h263_pred);
-
- if (s->pict_type == AV_PICTURE_TYPE_P) {
- 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;
- s->current_picture.mb_type[xy] = MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
- s->mv[0][0][0] = 0;
- s->mv[0][0][1] = 0;
- s->mb_skipped = !(s->obmc | s->loop_filter);
- goto end;
- }
- cbpc = get_vlc2(&s->gb, ff_h263_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->pb_frame && get_bits1(&s->gb))
- pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
- cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
- if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
- cbpy ^= 0xF;
-
- cbp = (cbpc & 3) | (cbpy << 2);
- if (dquant) {
- h263_decode_dquant(s);
- }
-
- s->mv_dir = MV_DIR_FORWARD;
- if ((cbpc & 16) == 0) {
- s->current_picture.mb_type[xy] = MB_TYPE_16x16 | MB_TYPE_L0;
- /* 16x16 motion prediction */
- s->mv_type = MV_TYPE_16X16;
- ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = ff_h263_decode_motion(s, pred_x, 1);
-
- if (mx >= 0xffff)
- return -1;
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = ff_h263_decode_motion(s, pred_y, 1);
-
- if (my >= 0xffff)
- return -1;
- s->mv[0][0][0] = mx;
- s->mv[0][0][1] = my;
-
- if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
- skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
- } 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 = ff_h263_pred_motion(s, i, 0, &pred_x, &pred_y);
- if (s->umvplus)
- mx = h263p_decode_umotion(s, pred_x);
- else
- mx = ff_h263_decode_motion(s, pred_x, 1);
- if (mx >= 0xffff)
- return -1;
-
- if (s->umvplus)
- my = h263p_decode_umotion(s, pred_y);
- else
- my = ff_h263_decode_motion(s, pred_y, 1);
- if (my >= 0xffff)
- return -1;
- s->mv[0][i][0] = mx;
- s->mv[0][i][1] = my;
- if (s->umvplus && (mx - pred_x) == 1 && (my - pred_y) == 1)
- skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
- mot_val[0] = mx;
- mot_val[1] = my;
- }
- }
- } else if(s->pict_type==AV_PICTURE_TYPE_B) {
- int mb_type;
- const int stride= s->b8_stride;
- int16_t *mot_val0 = s->current_picture.motion_val[0][2 * (s->mb_x + s->mb_y * stride)];
- int16_t *mot_val1 = s->current_picture.motion_val[1][2 * (s->mb_x + s->mb_y * stride)];
-// const int mv_xy= s->mb_x + 1 + s->mb_y * s->mb_stride;
-
- //FIXME ugly
- mot_val0[0 ]= mot_val0[2 ]= mot_val0[0+2*stride]= mot_val0[2+2*stride]=
- mot_val0[1 ]= mot_val0[3 ]= mot_val0[1+2*stride]= mot_val0[3+2*stride]=
- mot_val1[0 ]= mot_val1[2 ]= mot_val1[0+2*stride]= mot_val1[2+2*stride]=
- mot_val1[1 ]= mot_val1[3 ]= mot_val1[1+2*stride]= mot_val1[3+2*stride]= 0;
-
- do{
- mb_type= get_vlc2(&s->gb, h263_mbtype_b_vlc.table, H263_MBTYPE_B_VLC_BITS, 2);
- if (mb_type < 0){
- av_log(s->avctx, AV_LOG_ERROR, "b mb_type damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- mb_type= h263_mb_type_b_map[ mb_type ];
- }while(!mb_type);
-
- s->mb_intra = IS_INTRA(mb_type);
- if(HAS_CBP(mb_type)){
- s->dsp.clear_blocks(s->block[0]);
- cbpc = get_vlc2(&s->gb, cbpc_b_vlc.table, CBPC_B_VLC_BITS, 1);
- if(s->mb_intra){
- dquant = IS_QUANT(mb_type);
- goto intra;
- }
-
- cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc.table, CBPY_VLC_BITS, 1);
-
- if (cbpy < 0){
- av_log(s->avctx, AV_LOG_ERROR, "b cbpy damaged at %d %d\n", s->mb_x, s->mb_y);
- return -1;
- }
-
- if(s->alt_inter_vlc==0 || (cbpc & 3)!=3)
- cbpy ^= 0xF;
-
- cbp = (cbpc & 3) | (cbpy << 2);
- }else
- cbp=0;
-
- av_assert2(!s->mb_intra);
-
- if(IS_QUANT(mb_type)){
- h263_decode_dquant(s);
- }
-
- if(IS_DIRECT(mb_type)){
- s->mv_dir = MV_DIR_FORWARD | MV_DIR_BACKWARD | MV_DIRECT;
- mb_type |= ff_mpeg4_set_direct_mv(s, 0, 0);
- }else{
- s->mv_dir = 0;
- s->mv_type= MV_TYPE_16X16;
-//FIXME UMV
-
- if(USES_LIST(mb_type, 0)){
- int16_t *mot_val= ff_h263_pred_motion(s, 0, 0, &mx, &my);
- s->mv_dir = MV_DIR_FORWARD;
-
- mx = ff_h263_decode_motion(s, mx, 1);
- my = ff_h263_decode_motion(s, my, 1);
-
- s->mv[0][0][0] = mx;
- s->mv[0][0][1] = my;
- mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
- mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
- }
-
- if(USES_LIST(mb_type, 1)){
- int16_t *mot_val= ff_h263_pred_motion(s, 0, 1, &mx, &my);
- s->mv_dir |= MV_DIR_BACKWARD;
-
- mx = ff_h263_decode_motion(s, mx, 1);
- my = ff_h263_decode_motion(s, my, 1);
-
- s->mv[1][0][0] = mx;
- s->mv[1][0][1] = my;
- mot_val[0 ]= mot_val[2 ]= mot_val[0+2*stride]= mot_val[2+2*stride]= mx;
- mot_val[1 ]= mot_val[3 ]= mot_val[1+2*stride]= mot_val[3+2*stride]= my;
- }
- }
-
- s->current_picture.mb_type[xy] = mb_type;
- } else { /* I-Frame */
- do{
- cbpc = get_vlc2(&s->gb, ff_h263_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);
-
- s->dsp.clear_blocks(s->block[0]);
-
- dquant = cbpc & 4;
- s->mb_intra = 1;
-intra:
- s->current_picture.mb_type[xy] = MB_TYPE_INTRA;
- if (s->h263_aic) {
- s->ac_pred = get_bits1(&s->gb);
- if(s->ac_pred){
- s->current_picture.mb_type[xy] = MB_TYPE_INTRA | MB_TYPE_ACPRED;
-
- s->h263_aic_dir = get_bits1(&s->gb);
- }
- }else
- s->ac_pred = 0;
-
- if(s->pb_frame && get_bits1(&s->gb))
- pb_mv_count = h263_get_modb(&s->gb, s->pb_frame, &cbpb);
- cbpy = get_vlc2(&s->gb, ff_h263_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);
- if (dquant) {
- h263_decode_dquant(s);
- }
-
- pb_mv_count += !!s->pb_frame;
- }
-
- while(pb_mv_count--){
- ff_h263_decode_motion(s, 0, 1);
- ff_h263_decode_motion(s, 0, 1);
- }
-
- /* decode each block */
- for (i = 0; i < 6; i++) {
- if (h263_decode_block(s, block[i], i, cbp&32) < 0)
- return -1;
- cbp+=cbp;
- }
-
- if(s->pb_frame && h263_skip_b_part(s, cbpb) < 0)
- return -1;
- if(s->obmc && !s->mb_intra){
- if(s->pict_type == AV_PICTURE_TYPE_P && s->mb_x+1<s->mb_width && s->mb_num_left != 1)
- preview_obmc(s);
- }
-end:
-
- /* per-MB end of slice check */
- {
- int v= show_bits(&s->gb, 16);
-
- if (get_bits_left(&s->gb) < 16) {
- v >>= 16 - get_bits_left(&s->gb);
- }
-
- if(v==0)
- return SLICE_END;
- }
-
- return SLICE_OK;
-}
-
-/* most is hardcoded. should extend to handle all h263 streams */
-int ff_h263_decode_picture_header(MpegEncContext *s)
-{
- int format, width, height, i;
- uint32_t startcode;
-
- align_get_bits(&s->gb);
-
- if (show_bits(&s->gb, 2) == 2 && s->avctx->frame_number == 0) {
- av_log(s->avctx, AV_LOG_WARNING, "Header looks like RTP instead of H.263\n");
- }
-
- startcode= get_bits(&s->gb, 22-8);
-
- for(i= get_bits_left(&s->gb); i>24; i-=8) {
- startcode = ((startcode << 8) | get_bits(&s->gb, 8)) & 0x003FFFFF;
-
- if(startcode == 0x20)
- break;
- }
-
- if (startcode != 0x20) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad picture start code\n");
- return -1;
- }
- /* temporal reference */
- i = get_bits(&s->gb, 8); /* picture timestamp */
- if( (s->picture_number&~0xFF)+i < s->picture_number)
- i+= 256;
- s->picture_number= (s->picture_number&~0xFF) + i;
-
- /* PTYPE starts here */
- if (get_bits1(&s->gb) != 1) {
- /* marker */
- av_log(s->avctx, AV_LOG_ERROR, "Bad marker\n");
- return -1;
- }
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad H263 id\n");
- return -1; /* h263 id */
- }
- skip_bits1(&s->gb); /* split screen off */
- skip_bits1(&s->gb); /* camera off */
- skip_bits1(&s->gb); /* freeze picture release off */
-
- format = get_bits(&s->gb, 3);
- /*
- 0 forbidden
- 1 sub-QCIF
- 10 QCIF
- 7 extended PTYPE (PLUSPTYPE)
- */
-
- if (format != 7 && format != 6) {
- s->h263_plus = 0;
- /* H.263v1 */
- width = ff_h263_format[format][0];
- height = ff_h263_format[format][1];
- if (!width)
- return -1;
-
- s->pict_type = AV_PICTURE_TYPE_I + get_bits1(&s->gb);
-
- s->h263_long_vectors = get_bits1(&s->gb);
-
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "H263 SAC not supported\n");
- return -1; /* SAC: off */
- }
- s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
- s->unrestricted_mv = s->h263_long_vectors || s->obmc;
-
- s->pb_frame = get_bits1(&s->gb);
- s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
- skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
-
- s->width = width;
- s->height = height;
- s->avctx->sample_aspect_ratio= (AVRational){12,11};
- s->avctx->time_base= (AVRational){1001, 30000};
- } else {
- int ufep;
-
- /* H.263v2 */
- s->h263_plus = 1;
- ufep = get_bits(&s->gb, 3); /* Update Full Extended PTYPE */
-
- /* ufep other than 0 and 1 are reserved */
- if (ufep == 1) {
- /* OPPTYPE */
- format = get_bits(&s->gb, 3);
- av_dlog(s->avctx, "ufep=1, format: %d\n", format);
- s->custom_pcf= get_bits1(&s->gb);
- s->umvplus = get_bits1(&s->gb); /* Unrestricted Motion Vector */
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Syntax-based Arithmetic Coding (SAC) not supported\n");
- }
- s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
- s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
- s->loop_filter= get_bits1(&s->gb);
- s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
- if(s->avctx->lowres)
- s->loop_filter = 0;
-
- s->h263_slice_structured= get_bits1(&s->gb);
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Reference Picture Selection not supported\n");
- }
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Independent Segment Decoding not supported\n");
- }
- s->alt_inter_vlc= get_bits1(&s->gb);
- s->modified_quant= get_bits1(&s->gb);
- if(s->modified_quant)
- s->chroma_qscale_table= ff_h263_chroma_qscale_table;
-
- skip_bits(&s->gb, 1); /* Prevent start code emulation */
-
- skip_bits(&s->gb, 3); /* Reserved */
- } else if (ufep != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "Bad UFEP type (%d)\n", ufep);
- return -1;
- }
-
- /* MPPTYPE */
- s->pict_type = get_bits(&s->gb, 3);
- switch(s->pict_type){
- case 0: s->pict_type= AV_PICTURE_TYPE_I;break;
- case 1: s->pict_type= AV_PICTURE_TYPE_P;break;
- case 2: s->pict_type= AV_PICTURE_TYPE_P;s->pb_frame = 3;break;
- case 3: s->pict_type= AV_PICTURE_TYPE_B;break;
- case 7: s->pict_type= AV_PICTURE_TYPE_I;break; //ZYGO
- default:
- return -1;
- }
- skip_bits(&s->gb, 2);
- s->no_rounding = get_bits1(&s->gb);
- skip_bits(&s->gb, 4);
-
- /* Get the picture dimensions */
- if (ufep) {
- if (format == 6) {
- /* Custom Picture Format (CPFMT) */
- s->aspect_ratio_info = get_bits(&s->gb, 4);
- av_dlog(s->avctx, "aspect: %d\n", s->aspect_ratio_info);
- /* aspect ratios:
- 0 - forbidden
- 1 - 1:1
- 2 - 12:11 (CIF 4:3)
- 3 - 10:11 (525-type 4:3)
- 4 - 16:11 (CIF 16:9)
- 5 - 40:33 (525-type 16:9)
- 6-14 - reserved
- */
- width = (get_bits(&s->gb, 9) + 1) * 4;
- skip_bits1(&s->gb);
- height = get_bits(&s->gb, 9) * 4;
- av_dlog(s->avctx, "\nH.263+ Custom picture: %dx%d\n",width,height);
- if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
- /* aspected dimensions */
- s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
- s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
- }else{
- s->avctx->sample_aspect_ratio= ff_h263_pixel_aspect[s->aspect_ratio_info];
- }
- } else {
- width = ff_h263_format[format][0];
- height = ff_h263_format[format][1];
- s->avctx->sample_aspect_ratio= (AVRational){12,11};
- }
- s->avctx->sample_aspect_ratio.den <<= s->ehc_mode;
- if ((width == 0) || (height == 0))
- return -1;
- s->width = width;
- s->height = height;
-
- if(s->custom_pcf){
- int gcd;
- s->avctx->time_base.den= 1800000;
- s->avctx->time_base.num= 1000 + get_bits1(&s->gb);
- s->avctx->time_base.num*= get_bits(&s->gb, 7);
- if(s->avctx->time_base.num == 0){
- av_log(s, AV_LOG_ERROR, "zero framerate\n");
- return -1;
- }
- gcd= av_gcd(s->avctx->time_base.den, s->avctx->time_base.num);
- s->avctx->time_base.den /= gcd;
- s->avctx->time_base.num /= gcd;
- }else{
- s->avctx->time_base= (AVRational){1001, 30000};
- }
- }
-
- if(s->custom_pcf){
- skip_bits(&s->gb, 2); //extended Temporal reference
- }
-
- if (ufep) {
- if (s->umvplus) {
- if(get_bits1(&s->gb)==0) /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
- skip_bits1(&s->gb);
- }
- if(s->h263_slice_structured){
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "rectangular slices not supported\n");
- }
- if (get_bits1(&s->gb) != 0) {
- av_log(s->avctx, AV_LOG_ERROR, "unordered slices not supported\n");
- }
- }
- }
-
- s->qscale = get_bits(&s->gb, 5);
- }
-
- if (s->width == 0 || s->height == 0) {
- av_log(s->avctx, AV_LOG_ERROR, "dimensions 0\n");
- return -1;
- }
- s->mb_width = (s->width + 15) / 16;
- s->mb_height = (s->height + 15) / 16;
- s->mb_num = s->mb_width * s->mb_height;
-
- if (s->pb_frame) {
- skip_bits(&s->gb, 3); /* Temporal reference for B-pictures */
- if (s->custom_pcf)
- skip_bits(&s->gb, 2); //extended Temporal reference
- skip_bits(&s->gb, 2); /* Quantization information for B-pictures */
- }
-
- if (s->pict_type!=AV_PICTURE_TYPE_B) {
- s->time = s->picture_number;
- s->pp_time = s->time - s->last_non_b_time;
- s->last_non_b_time = s->time;
- }else{
- s->time = s->picture_number;
- 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){
- s->pp_time = 2;
- s->pb_time = 1;
- }
- ff_mpeg4_init_direct_mv(s);
- }
-
- /* PEI */
- if (skip_1stop_8data_bits(&s->gb) < 0)
- return AVERROR_INVALIDDATA;
-
- if(s->h263_slice_structured){
- if (get_bits1(&s->gb) != 1) {
- av_log(s->avctx, AV_LOG_ERROR, "SEPB1 marker missing\n");
- return -1;
- }
-
- ff_h263_decode_mba(s);
-
- if (get_bits1(&s->gb) != 1) {
- av_log(s->avctx, AV_LOG_ERROR, "SEPB2 marker missing\n");
- return -1;
- }
- }
- s->f_code = 1;
-
- if(s->h263_aic){
- s->y_dc_scale_table=
- s->c_dc_scale_table= ff_aic_dc_scale_table;
- }else{
- s->y_dc_scale_table=
- s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
- }
-
- ff_h263_show_pict_info(s);
- if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
- int i,j;
- for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
- av_log(s->avctx, AV_LOG_DEBUG, "\n");
- for(i=0; i<13; i++){
- for(j=0; j<3; j++){
- int v= get_bits(&s->gb, 8);
- v |= get_sbits(&s->gb, 8)<<8;
- av_log(s->avctx, AV_LOG_DEBUG, " %5d", v);
- }
- av_log(s->avctx, AV_LOG_DEBUG, "\n");
- }
- for(i=0; i<50; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
- }
-
- return 0;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 17:04:48 +0000