1465 lines
42 KiB
C
1465 lines
42 KiB
C
/*
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* H263/MPEG4 backend for ffmpeg encoder and decoder
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* Copyright (c) 2000,2001 Gerard Lantau.
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* H263+ support.
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* Copyright (c) 2001 Juan J. Sierralta P.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "common.h"
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#include "dsputil.h"
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#include "avcodec.h"
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#include "mpegvideo.h"
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#include "h263data.h"
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#include "mpeg4data.h"
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static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
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int n);
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static void h263_encode_motion(MpegEncContext * s, int val);
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static void h263p_encode_umotion(MpegEncContext * s, int val);
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static void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block,
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int n);
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static int h263_decode_motion(MpegEncContext * s, int pred);
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static int h263p_decode_umotion(MpegEncContext * s, int pred);
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static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
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int n, int coded);
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static int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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int n, int coded);
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int h263_get_picture_format(int width, int height)
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{
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int format;
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if (width == 128 && height == 96)
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format = 1;
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else if (width == 176 && height == 144)
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format = 2;
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else if (width == 352 && height == 288)
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format = 3;
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else if (width == 704 && height == 576)
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format = 4;
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else if (width == 1408 && height == 1152)
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format = 5;
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else
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format = 7;
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return format;
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}
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void h263_encode_picture_header(MpegEncContext * s, int picture_number)
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{
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int format;
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align_put_bits(&s->pb);
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put_bits(&s->pb, 22, 0x20);
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put_bits(&s->pb, 8, ((s->picture_number * 30 * FRAME_RATE_BASE) /
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s->frame_rate) & 0xff);
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put_bits(&s->pb, 1, 1); /* marker */
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put_bits(&s->pb, 1, 0); /* h263 id */
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put_bits(&s->pb, 1, 0); /* split screen off */
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put_bits(&s->pb, 1, 0); /* camera off */
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put_bits(&s->pb, 1, 0); /* freeze picture release off */
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format = h263_get_picture_format(s->width, s->height);
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if (!s->h263_plus) {
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/* H.263v1 */
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put_bits(&s->pb, 3, format);
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put_bits(&s->pb, 1, (s->pict_type == P_TYPE));
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/* By now UMV IS DISABLED ON H.263v1, since the restrictions
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of H.263v1 UMV implies to check the predicted MV after
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calculation of the current MB to see if we're on the limits */
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put_bits(&s->pb, 1, 0); /* unrestricted motion vector: off */
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put_bits(&s->pb, 1, 0); /* SAC: off */
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put_bits(&s->pb, 1, 0); /* advanced prediction mode: off */
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put_bits(&s->pb, 1, 0); /* not PB frame */
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put_bits(&s->pb, 5, s->qscale);
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put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */
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} else {
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/* H.263v2 */
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/* H.263 Plus PTYPE */
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put_bits(&s->pb, 3, 7);
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put_bits(&s->pb,3,1); /* Update Full Extended PTYPE */
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if (format == 7)
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put_bits(&s->pb,3,6); /* Custom Source Format */
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else
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put_bits(&s->pb, 3, format);
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put_bits(&s->pb,1,0); /* Custom PCF: off */
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s->umvplus = (s->pict_type == P_TYPE) && s->unrestricted_mv;
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put_bits(&s->pb, 1, s->umvplus); /* Unrestricted Motion Vector */
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put_bits(&s->pb,1,0); /* SAC: off */
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put_bits(&s->pb,1,0); /* Advanced Prediction Mode: off */
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put_bits(&s->pb,1,0); /* Advanced Intra Coding: off */
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put_bits(&s->pb,1,0); /* Deblocking Filter: off */
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put_bits(&s->pb,1,0); /* Slice Structured: off */
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put_bits(&s->pb,1,0); /* Reference Picture Selection: off */
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put_bits(&s->pb,1,0); /* Independent Segment Decoding: off */
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put_bits(&s->pb,1,0); /* Alternative Inter VLC: off */
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put_bits(&s->pb,1,0); /* Modified Quantization: off */
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put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
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put_bits(&s->pb,3,0); /* Reserved */
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put_bits(&s->pb, 3, s->pict_type == P_TYPE);
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put_bits(&s->pb,1,0); /* Reference Picture Resampling: off */
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put_bits(&s->pb,1,0); /* Reduced-Resolution Update: off */
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put_bits(&s->pb,1,0); /* Rounding Type */
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put_bits(&s->pb,2,0); /* Reserved */
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put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
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/* This should be here if PLUSPTYPE */
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put_bits(&s->pb, 1, 0); /* Continuous Presence Multipoint mode: off */
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if (format == 7) {
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/* Custom Picture Format (CPFMT) */
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put_bits(&s->pb,4,2); /* Aspect ratio: CIF 12:11 (4:3) picture */
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put_bits(&s->pb,9,(s->width >> 2) - 1);
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put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
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put_bits(&s->pb,9,(s->height >> 2));
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}
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/* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
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if (s->umvplus)
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put_bits(&s->pb,1,1); /* Limited according tables of Annex D */
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put_bits(&s->pb, 5, s->qscale);
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}
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put_bits(&s->pb, 1, 0); /* no PEI */
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}
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void h263_encode_mb(MpegEncContext * s,
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DCTELEM block[6][64],
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int motion_x, int motion_y)
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{
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int cbpc, cbpy, i, cbp, pred_x, pred_y;
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// printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
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if (!s->mb_intra) {
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/* compute cbp */
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cbp = 0;
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for (i = 0; i < 6; i++) {
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if (s->block_last_index[i] >= 0)
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cbp |= 1 << (5 - i);
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}
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if ((cbp | motion_x | motion_y) == 0) {
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/* skip macroblock */
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put_bits(&s->pb, 1, 1);
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return;
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}
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put_bits(&s->pb, 1, 0); /* mb coded */
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cbpc = cbp & 3;
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put_bits(&s->pb,
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inter_MCBPC_bits[cbpc],
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inter_MCBPC_code[cbpc]);
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cbpy = cbp >> 2;
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cbpy ^= 0xf;
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put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
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/* motion vectors: 16x16 mode only now */
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h263_pred_motion(s, 0, &pred_x, &pred_y);
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if (!s->umvplus) {
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h263_encode_motion(s, motion_x - pred_x);
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h263_encode_motion(s, motion_y - pred_y);
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}
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else {
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h263p_encode_umotion(s, motion_x - pred_x);
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h263p_encode_umotion(s, motion_y - pred_y);
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if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1))
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/* To prevent Start Code emulation */
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put_bits(&s->pb,1,1);
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}
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} else {
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/* compute cbp */
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cbp = 0;
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for (i = 0; i < 6; i++) {
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if (s->block_last_index[i] >= 1)
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cbp |= 1 << (5 - i);
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}
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cbpc = cbp & 3;
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if (s->pict_type == I_TYPE) {
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put_bits(&s->pb,
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intra_MCBPC_bits[cbpc],
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intra_MCBPC_code[cbpc]);
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} else {
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put_bits(&s->pb, 1, 0); /* mb coded */
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put_bits(&s->pb,
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inter_MCBPC_bits[cbpc + 4],
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inter_MCBPC_code[cbpc + 4]);
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}
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if (s->h263_pred) {
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/* XXX: currently, we do not try to use ac prediction */
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put_bits(&s->pb, 1, 0); /* no ac prediction */
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}
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cbpy = cbp >> 2;
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put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
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}
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/* encode each block */
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if (s->h263_pred) {
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for (i = 0; i < 6; i++) {
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mpeg4_encode_block(s, block[i], i);
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}
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} else {
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for (i = 0; i < 6; i++) {
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h263_encode_block(s, block[i], i);
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}
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}
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}
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static inline int mid_pred(int a, int b, int c)
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{
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int vmin, vmax;
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vmin = a;
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if (b < vmin)
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vmin = b;
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if (c < vmin)
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vmin = c;
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vmax = a;
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if (b > vmax)
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vmax = b;
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if (c > vmax)
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vmax = c;
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return a + b + c - vmin - vmax;
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}
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INT16 *h263_pred_motion(MpegEncContext * s, int block,
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int *px, int *py)
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{
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int x, y, wrap;
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INT16 *A, *B, *C, *mot_val;
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x = 2 * s->mb_x + 1 + (block & 1);
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y = 2 * s->mb_y + 1 + ((block >> 1) & 1);
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wrap = 2 * s->mb_width + 2;
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mot_val = s->motion_val[(x) + (y) * wrap];
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/* special case for first line */
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if (y == 1 || s->first_slice_line) {
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A = s->motion_val[(x-1) + (y) * wrap];
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*px = A[0];
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*py = A[1];
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} else {
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switch(block) {
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default:
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case 0:
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A = s->motion_val[(x-1) + (y) * wrap];
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B = s->motion_val[(x) + (y-1) * wrap];
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C = s->motion_val[(x+2) + (y-1) * wrap];
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break;
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case 1:
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case 2:
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A = s->motion_val[(x-1) + (y) * wrap];
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B = s->motion_val[(x) + (y-1) * wrap];
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C = s->motion_val[(x+1) + (y-1) * wrap];
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break;
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case 3:
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A = s->motion_val[(x-1) + (y) * wrap];
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B = s->motion_val[(x-1) + (y-1) * wrap];
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C = s->motion_val[(x) + (y-1) * wrap];
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break;
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}
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*px = mid_pred(A[0], B[0], C[0]);
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*py = mid_pred(A[1], B[1], C[1]);
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}
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return mot_val;
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}
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static void h263_encode_motion(MpegEncContext * s, int val)
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{
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int range, l, m, bit_size, sign, code, bits;
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if (val == 0) {
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/* zero vector */
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code = 0;
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put_bits(&s->pb, mvtab[code][1], mvtab[code][0]);
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} else {
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bit_size = s->f_code - 1;
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range = 1 << bit_size;
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/* modulo encoding */
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l = range * 32;
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m = 2 * l;
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if (val < -l) {
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val += m;
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} else if (val >= l) {
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val -= m;
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}
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if (val >= 0) {
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val--;
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code = (val >> bit_size) + 1;
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bits = val & (range - 1);
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sign = 0;
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} else {
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val = -val;
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val--;
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code = (val >> bit_size) + 1;
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bits = val & (range - 1);
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sign = 1;
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}
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put_bits(&s->pb, mvtab[code][1] + 1, (mvtab[code][0] << 1) | sign);
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if (bit_size > 0) {
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put_bits(&s->pb, bit_size, bits);
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}
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}
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}
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/* Encode MV differences on H.263+ with Unrestricted MV mode */
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static void h263p_encode_umotion(MpegEncContext * s, int val)
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{
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short sval = 0;
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short i = 0;
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short n_bits = 0;
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short temp_val;
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int code = 0;
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int tcode;
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if ( val == 0)
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put_bits(&s->pb, 1, 1);
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else if (val == 1)
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put_bits(&s->pb, 3, 0);
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else if (val == -1)
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put_bits(&s->pb, 3, 2);
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else {
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sval = ((val < 0) ? (short)(-val):(short)val);
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temp_val = sval;
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while (temp_val != 0) {
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temp_val = temp_val >> 1;
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n_bits++;
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}
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i = n_bits - 1;
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while (i > 0) {
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tcode = (sval & (1 << (i-1))) >> (i-1);
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tcode = (tcode << 1) | 1;
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code = (code << 2) | tcode;
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i--;
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}
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code = ((code << 1) | (val < 0)) << 1;
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put_bits(&s->pb, (2*n_bits)+1, code);
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//printf("\nVal = %d\tCode = %d", sval, code);
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}
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}
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void h263_encode_init_vlc(MpegEncContext *s)
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{
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static int done = 0;
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if (!done) {
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done = 1;
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init_rl(&rl_inter);
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init_rl(&rl_intra);
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}
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}
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static void h263_encode_block(MpegEncContext * s, DCTELEM * block, int n)
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{
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int level, run, last, i, j, last_index, last_non_zero, sign, slevel;
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int code;
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RLTable *rl = &rl_inter;
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if (s->mb_intra) {
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/* DC coef */
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level = block[0];
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/* 255 cannot be represented, so we clamp */
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if (level > 254) {
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level = 254;
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block[0] = 254;
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}
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if (level == 128)
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put_bits(&s->pb, 8, 0xff);
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else
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put_bits(&s->pb, 8, level & 0xff);
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i = 1;
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} else {
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i = 0;
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}
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/* AC coefs */
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last_index = s->block_last_index[n];
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last_non_zero = i - 1;
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for (; i <= last_index; i++) {
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j = zigzag_direct[i];
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level = block[j];
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if (level) {
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run = i - last_non_zero - 1;
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last = (i == last_index);
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sign = 0;
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slevel = level;
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if (level < 0) {
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sign = 1;
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level = -level;
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}
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code = get_rl_index(rl, last, run, level);
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put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
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if (code == rl->n) {
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put_bits(&s->pb, 1, last);
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put_bits(&s->pb, 6, run);
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put_bits(&s->pb, 8, slevel & 0xff);
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} else {
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put_bits(&s->pb, 1, sign);
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}
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last_non_zero = i;
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}
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}
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}
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/***************************************************/
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/* write mpeg4 VOP header */
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void mpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
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{
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align_put_bits(&s->pb);
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put_bits(&s->pb, 32, 0x1B6); /* vop header */
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put_bits(&s->pb, 2, s->pict_type - 1); /* pict type: I = 0 , P = 1 */
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/* XXX: time base + 1 not always correct */
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put_bits(&s->pb, 1, 1);
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put_bits(&s->pb, 1, 0);
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put_bits(&s->pb, 1, 1); /* marker */
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put_bits(&s->pb, 4, 1); /* XXX: correct time increment */
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put_bits(&s->pb, 1, 1); /* marker */
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put_bits(&s->pb, 1, 1); /* vop coded */
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if (s->pict_type == P_TYPE) {
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s->no_rounding = 0;
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put_bits(&s->pb, 1, s->no_rounding); /* rounding type */
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}
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put_bits(&s->pb, 3, 0); /* intra dc VLC threshold */
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put_bits(&s->pb, 5, s->qscale);
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if (s->pict_type != I_TYPE)
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put_bits(&s->pb, 3, s->f_code); /* fcode_for */
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// printf("****frame %d\n", picture_number);
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}
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void h263_dc_scale(MpegEncContext * s)
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{
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int quant;
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quant = s->qscale;
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/* luminance */
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if (quant < 5)
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s->y_dc_scale = 8;
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else if (quant > 4 && quant < 9)
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s->y_dc_scale = (2 * quant);
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else if (quant > 8 && quant < 25)
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s->y_dc_scale = (quant + 8);
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else
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s->y_dc_scale = (2 * quant - 16);
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/* chrominance */
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if (quant < 5)
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s->c_dc_scale = 8;
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else if (quant > 4 && quant < 25)
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s->c_dc_scale = ((quant + 13) / 2);
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else
|
|
s->c_dc_scale = (quant - 6);
|
|
}
|
|
|
|
static int mpeg4_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr, int *dir_ptr)
|
|
{
|
|
int a, b, c, x, y, wrap, pred, scale;
|
|
UINT16 *dc_val;
|
|
|
|
/* find prediction */
|
|
if (n < 4) {
|
|
x = 2 * s->mb_x + 1 + (n & 1);
|
|
y = 2 * s->mb_y + 1 + ((n & 2) >> 1);
|
|
wrap = s->mb_width * 2 + 2;
|
|
dc_val = s->dc_val[0];
|
|
scale = s->y_dc_scale;
|
|
} else {
|
|
x = s->mb_x + 1;
|
|
y = s->mb_y + 1;
|
|
wrap = s->mb_width + 2;
|
|
dc_val = s->dc_val[n - 4 + 1];
|
|
scale = s->c_dc_scale;
|
|
}
|
|
|
|
/* B C
|
|
* A X
|
|
*/
|
|
a = dc_val[(x - 1) + (y) * wrap];
|
|
b = dc_val[(x - 1) + (y - 1) * wrap];
|
|
c = dc_val[(x) + (y - 1) * wrap];
|
|
|
|
if (abs(a - b) < abs(b - c)) {
|
|
pred = c;
|
|
*dir_ptr = 1; /* top */
|
|
} else {
|
|
pred = a;
|
|
*dir_ptr = 0; /* left */
|
|
}
|
|
/* we assume pred is positive */
|
|
pred = (pred + (scale >> 1)) / scale;
|
|
|
|
/* prepare address for prediction update */
|
|
*dc_val_ptr = &dc_val[(x) + (y) * wrap];
|
|
|
|
return pred;
|
|
}
|
|
|
|
void mpeg4_pred_ac(MpegEncContext * s, INT16 *block, int n,
|
|
int dir)
|
|
{
|
|
int x, y, wrap, i;
|
|
INT16 *ac_val, *ac_val1;
|
|
|
|
/* find prediction */
|
|
if (n < 4) {
|
|
x = 2 * s->mb_x + 1 + (n & 1);
|
|
y = 2 * s->mb_y + 1 + ((n & 2) >> 1);
|
|
wrap = s->mb_width * 2 + 2;
|
|
ac_val = s->ac_val[0][0];
|
|
} else {
|
|
x = s->mb_x + 1;
|
|
y = s->mb_y + 1;
|
|
wrap = s->mb_width + 2;
|
|
ac_val = s->ac_val[n - 4 + 1][0];
|
|
}
|
|
ac_val += ((y) * wrap + (x)) * 16;
|
|
ac_val1 = ac_val;
|
|
if (s->ac_pred) {
|
|
if (dir == 0) {
|
|
/* left prediction */
|
|
ac_val -= 16;
|
|
for(i=1;i<8;i++) {
|
|
block[i*8] += ac_val[i];
|
|
}
|
|
} else {
|
|
/* top prediction */
|
|
ac_val -= 16 * wrap;
|
|
for(i=1;i<8;i++) {
|
|
block[i] += ac_val[i + 8];
|
|
}
|
|
}
|
|
}
|
|
/* left copy */
|
|
for(i=1;i<8;i++)
|
|
ac_val1[i] = block[i * 8];
|
|
/* top copy */
|
|
for(i=1;i<8;i++)
|
|
ac_val1[8 + i] = block[i];
|
|
}
|
|
|
|
static inline void mpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
|
|
{
|
|
int size, v, pred;
|
|
UINT16 *dc_val;
|
|
|
|
pred = mpeg4_pred_dc(s, n, &dc_val, dir_ptr);
|
|
if (n < 4) {
|
|
*dc_val = level * s->y_dc_scale;
|
|
} else {
|
|
*dc_val = level * s->c_dc_scale;
|
|
}
|
|
|
|
/* do the prediction */
|
|
level -= pred;
|
|
/* find number of bits */
|
|
size = 0;
|
|
v = abs(level);
|
|
while (v) {
|
|
v >>= 1;
|
|
size++;
|
|
}
|
|
|
|
if (n < 4) {
|
|
/* luminance */
|
|
put_bits(&s->pb, DCtab_lum[size][1], DCtab_lum[size][0]);
|
|
} else {
|
|
/* chrominance */
|
|
put_bits(&s->pb, DCtab_chrom[size][1], DCtab_chrom[size][0]);
|
|
}
|
|
|
|
/* encode remaining bits */
|
|
if (size > 0) {
|
|
if (level < 0)
|
|
level = (-level) ^ ((1 << size) - 1);
|
|
put_bits(&s->pb, size, level);
|
|
if (size > 8)
|
|
put_bits(&s->pb, 1, 1);
|
|
}
|
|
}
|
|
|
|
static void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
|
|
{
|
|
int level, run, last, i, j, last_index, last_non_zero, sign, slevel;
|
|
int code, dc_pred_dir;
|
|
const RLTable *rl;
|
|
|
|
if (s->mb_intra) {
|
|
/* mpeg4 based DC predictor */
|
|
mpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
|
|
i = 1;
|
|
rl = &rl_intra;
|
|
} else {
|
|
i = 0;
|
|
rl = &rl_inter;
|
|
}
|
|
|
|
/* AC coefs */
|
|
last_index = s->block_last_index[n];
|
|
last_non_zero = i - 1;
|
|
for (; i <= last_index; i++) {
|
|
j = zigzag_direct[i];
|
|
level = block[j];
|
|
if (level) {
|
|
run = i - last_non_zero - 1;
|
|
last = (i == last_index);
|
|
sign = 0;
|
|
slevel = level;
|
|
if (level < 0) {
|
|
sign = 1;
|
|
level = -level;
|
|
}
|
|
code = get_rl_index(rl, last, run, level);
|
|
put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
|
|
if (code == rl->n) {
|
|
int level1, run1;
|
|
level1 = level - rl->max_level[last][run];
|
|
if (level1 < 1)
|
|
goto esc2;
|
|
code = get_rl_index(rl, last, run, level1);
|
|
if (code == rl->n) {
|
|
esc2:
|
|
put_bits(&s->pb, 1, 1);
|
|
if (level > MAX_LEVEL)
|
|
goto esc3;
|
|
run1 = run - rl->max_run[last][level] - 1;
|
|
if (run1 < 0)
|
|
goto esc3;
|
|
code = get_rl_index(rl, last, run1, level);
|
|
if (code == rl->n) {
|
|
esc3:
|
|
/* third escape */
|
|
put_bits(&s->pb, 1, 1);
|
|
put_bits(&s->pb, 1, last);
|
|
put_bits(&s->pb, 6, run);
|
|
put_bits(&s->pb, 1, 1);
|
|
put_bits(&s->pb, 12, slevel & 0xfff);
|
|
put_bits(&s->pb, 1, 1);
|
|
} else {
|
|
/* second escape */
|
|
put_bits(&s->pb, 1, 0);
|
|
put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
|
|
put_bits(&s->pb, 1, sign);
|
|
}
|
|
} else {
|
|
/* first escape */
|
|
put_bits(&s->pb, 1, 0);
|
|
put_bits(&s->pb, rl->table_vlc[code][1], rl->table_vlc[code][0]);
|
|
put_bits(&s->pb, 1, sign);
|
|
}
|
|
} else {
|
|
put_bits(&s->pb, 1, sign);
|
|
}
|
|
last_non_zero = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/***********************************************/
|
|
/* decoding */
|
|
|
|
static VLC intra_MCBPC_vlc;
|
|
static VLC inter_MCBPC_vlc;
|
|
static VLC cbpy_vlc;
|
|
static VLC mv_vlc;
|
|
static VLC dc_lum, dc_chrom;
|
|
|
|
void init_rl(RLTable *rl)
|
|
{
|
|
INT8 max_level[MAX_RUN+1], max_run[MAX_LEVEL+1];
|
|
UINT8 index_run[MAX_RUN+1];
|
|
int last, run, level, start, end, i;
|
|
|
|
/* compute max_level[], max_run[] and index_run[] */
|
|
for(last=0;last<2;last++) {
|
|
if (last == 0) {
|
|
start = 0;
|
|
end = rl->last;
|
|
} else {
|
|
start = rl->last;
|
|
end = rl->n;
|
|
}
|
|
|
|
memset(max_level, 0, MAX_RUN + 1);
|
|
memset(max_run, 0, MAX_LEVEL + 1);
|
|
memset(index_run, rl->n, MAX_RUN + 1);
|
|
for(i=start;i<end;i++) {
|
|
run = rl->table_run[i];
|
|
level = rl->table_level[i];
|
|
if (index_run[run] == rl->n)
|
|
index_run[run] = i;
|
|
if (level > max_level[run])
|
|
max_level[run] = level;
|
|
if (run > max_run[level])
|
|
max_run[level] = run;
|
|
}
|
|
rl->max_level[last] = malloc(MAX_RUN + 1);
|
|
memcpy(rl->max_level[last], max_level, MAX_RUN + 1);
|
|
rl->max_run[last] = malloc(MAX_LEVEL + 1);
|
|
memcpy(rl->max_run[last], max_run, MAX_LEVEL + 1);
|
|
rl->index_run[last] = malloc(MAX_RUN + 1);
|
|
memcpy(rl->index_run[last], index_run, MAX_RUN + 1);
|
|
}
|
|
}
|
|
|
|
void init_vlc_rl(RLTable *rl)
|
|
{
|
|
init_vlc(&rl->vlc, 9, rl->n + 1,
|
|
&rl->table_vlc[0][1], 4, 2,
|
|
&rl->table_vlc[0][0], 4, 2);
|
|
}
|
|
|
|
/* init vlcs */
|
|
|
|
/* XXX: find a better solution to handle static init */
|
|
void h263_decode_init_vlc(MpegEncContext *s)
|
|
{
|
|
static int done = 0;
|
|
|
|
if (!done) {
|
|
done = 1;
|
|
|
|
init_vlc(&intra_MCBPC_vlc, 6, 8,
|
|
intra_MCBPC_bits, 1, 1,
|
|
intra_MCBPC_code, 1, 1);
|
|
init_vlc(&inter_MCBPC_vlc, 9, 20,
|
|
inter_MCBPC_bits, 1, 1,
|
|
inter_MCBPC_code, 1, 1);
|
|
init_vlc(&cbpy_vlc, 6, 16,
|
|
&cbpy_tab[0][1], 2, 1,
|
|
&cbpy_tab[0][0], 2, 1);
|
|
init_vlc(&mv_vlc, 9, 33,
|
|
&mvtab[0][1], 2, 1,
|
|
&mvtab[0][0], 2, 1);
|
|
init_rl(&rl_inter);
|
|
init_rl(&rl_intra);
|
|
init_vlc_rl(&rl_inter);
|
|
init_vlc_rl(&rl_intra);
|
|
init_vlc(&dc_lum, 9, 13,
|
|
&DCtab_lum[0][1], 2, 1,
|
|
&DCtab_lum[0][0], 2, 1);
|
|
init_vlc(&dc_chrom, 9, 13,
|
|
&DCtab_chrom[0][1], 2, 1,
|
|
&DCtab_chrom[0][0], 2, 1);
|
|
}
|
|
}
|
|
|
|
int h263_decode_mb(MpegEncContext *s,
|
|
DCTELEM block[6][64])
|
|
{
|
|
int cbpc, cbpy, i, cbp, pred_x, pred_y, mx, my, dquant;
|
|
INT16 *mot_val;
|
|
static INT8 quant_tab[4] = { -1, -2, 1, 2 };
|
|
|
|
if (s->pict_type == P_TYPE) {
|
|
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->mv[0][0][0] = 0;
|
|
s->mv[0][0][1] = 0;
|
|
s->mb_skiped = 1;
|
|
return 0;
|
|
}
|
|
cbpc = get_vlc(&s->gb, &inter_MCBPC_vlc);
|
|
if (cbpc < 0)
|
|
return -1;
|
|
dquant = cbpc & 8;
|
|
s->mb_intra = ((cbpc & 4) != 0);
|
|
} else {
|
|
cbpc = get_vlc(&s->gb, &intra_MCBPC_vlc);
|
|
if (cbpc < 0)
|
|
return -1;
|
|
dquant = cbpc & 4;
|
|
s->mb_intra = 1;
|
|
}
|
|
|
|
if (!s->mb_intra) {
|
|
cbpy = get_vlc(&s->gb, &cbpy_vlc);
|
|
cbp = (cbpc & 3) | ((cbpy ^ 0xf) << 2);
|
|
if (dquant) {
|
|
s->qscale += quant_tab[get_bits(&s->gb, 2)];
|
|
if (s->qscale < 1)
|
|
s->qscale = 1;
|
|
else if (s->qscale > 31)
|
|
s->qscale = 31;
|
|
}
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
if ((cbpc & 16) == 0) {
|
|
/* 16x16 motion prediction */
|
|
s->mv_type = MV_TYPE_16X16;
|
|
h263_pred_motion(s, 0, &pred_x, &pred_y);
|
|
if (s->umvplus_dec)
|
|
mx = h263p_decode_umotion(s, pred_x);
|
|
else
|
|
mx = h263_decode_motion(s, pred_x);
|
|
if (mx >= 0xffff)
|
|
return -1;
|
|
|
|
if (s->umvplus_dec)
|
|
my = h263p_decode_umotion(s, pred_y);
|
|
else
|
|
my = h263_decode_motion(s, pred_y);
|
|
if (my >= 0xffff)
|
|
return -1;
|
|
s->mv[0][0][0] = mx;
|
|
s->mv[0][0][1] = my;
|
|
if (s->umvplus_dec && (mx - pred_x) == 1 && (my - pred_y) == 1)
|
|
skip_bits1(&s->gb); /* Bit stuffing to prevent PSC */
|
|
|
|
} else {
|
|
s->mv_type = MV_TYPE_8X8;
|
|
for(i=0;i<4;i++) {
|
|
mot_val = h263_pred_motion(s, i, &pred_x, &pred_y);
|
|
if (s->umvplus_dec)
|
|
mx = h263p_decode_umotion(s, pred_x);
|
|
else
|
|
mx = h263_decode_motion(s, pred_x);
|
|
if (mx >= 0xffff)
|
|
return -1;
|
|
|
|
if (s->umvplus_dec)
|
|
my = h263p_decode_umotion(s, pred_y);
|
|
else
|
|
my = h263_decode_motion(s, pred_y);
|
|
if (my >= 0xffff)
|
|
return -1;
|
|
s->mv[0][i][0] = mx;
|
|
s->mv[0][i][1] = my;
|
|
if (s->umvplus_dec && (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 {
|
|
s->ac_pred = 0;
|
|
if (s->h263_pred) {
|
|
s->ac_pred = get_bits1(&s->gb);
|
|
}
|
|
cbpy = get_vlc(&s->gb, &cbpy_vlc);
|
|
cbp = (cbpc & 3) | (cbpy << 2);
|
|
if (dquant) {
|
|
s->qscale += quant_tab[get_bits(&s->gb, 2)];
|
|
if (s->qscale < 1)
|
|
s->qscale = 1;
|
|
else if (s->qscale > 31)
|
|
s->qscale = 31;
|
|
}
|
|
}
|
|
|
|
/* decode each block */
|
|
if (s->h263_pred) {
|
|
for (i = 0; i < 6; i++) {
|
|
if (mpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1) < 0)
|
|
return -1;
|
|
}
|
|
} else {
|
|
for (i = 0; i < 6; i++) {
|
|
if (h263_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1) < 0)
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int h263_decode_motion(MpegEncContext * s, int pred)
|
|
{
|
|
int code, val, sign, shift, l, m;
|
|
|
|
code = get_vlc(&s->gb, &mv_vlc);
|
|
if (code < 0)
|
|
return 0xffff;
|
|
|
|
if (code == 0)
|
|
return pred;
|
|
sign = get_bits1(&s->gb);
|
|
shift = s->f_code - 1;
|
|
val = (code - 1) << shift;
|
|
if (shift > 0)
|
|
val |= get_bits(&s->gb, shift);
|
|
val++;
|
|
if (sign)
|
|
val = -val;
|
|
val += pred;
|
|
|
|
/* modulo decoding */
|
|
if (!s->h263_long_vectors) {
|
|
l = (1 << (s->f_code - 1)) * 32;
|
|
m = 2 * l;
|
|
if (val < -l) {
|
|
val += m;
|
|
} else if (val >= l) {
|
|
val -= m;
|
|
}
|
|
} else {
|
|
/* horrible h263 long vector mode */
|
|
if (pred < -31 && val < -63)
|
|
val += 64;
|
|
if (pred > 32 && val > 63)
|
|
val -= 64;
|
|
}
|
|
return val;
|
|
}
|
|
|
|
/* Decodes 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);
|
|
#ifdef DEBUG
|
|
fprintf(stderr,"H.263+ UMV Motion = %d\n", code);
|
|
#endif
|
|
return code;
|
|
|
|
}
|
|
|
|
static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
|
|
int n, int coded)
|
|
{
|
|
int code, level, i, j, last, run;
|
|
RLTable *rl = &rl_inter;
|
|
|
|
if (s->mb_intra) {
|
|
/* DC coef */
|
|
if (s->h263_rv10 && s->rv10_version == 3 && s->pict_type == I_TYPE) {
|
|
int component, diff;
|
|
component = (n <= 3 ? 0 : n - 4 + 1);
|
|
level = s->last_dc[component];
|
|
if (s->rv10_first_dc_coded[component]) {
|
|
diff = 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;
|
|
}
|
|
block[0] = level;
|
|
i = 1;
|
|
} else {
|
|
i = 0;
|
|
}
|
|
if (!coded) {
|
|
s->block_last_index[n] = i - 1;
|
|
return 0;
|
|
}
|
|
|
|
for(;;) {
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
if (code == rl->n) {
|
|
/* escape */
|
|
last = get_bits1(&s->gb);
|
|
run = get_bits(&s->gb, 6);
|
|
level = (INT8)get_bits(&s->gb, 8);
|
|
if (s->h263_rv10 && level == -128) {
|
|
/* XXX: should patch encoder too */
|
|
level = get_bits(&s->gb, 12);
|
|
level = (level << 20) >> 20;
|
|
}
|
|
} 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)
|
|
return -1;
|
|
j = zigzag_direct[i];
|
|
block[j] = level;
|
|
if (last)
|
|
break;
|
|
i++;
|
|
}
|
|
s->block_last_index[n] = i;
|
|
return 0;
|
|
}
|
|
|
|
static int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
|
|
{
|
|
int level, pred, code;
|
|
UINT16 *dc_val;
|
|
|
|
if (n < 4)
|
|
code = get_vlc(&s->gb, &dc_lum);
|
|
else
|
|
code = get_vlc(&s->gb, &dc_chrom);
|
|
if (code < 0)
|
|
return -1;
|
|
if (code == 0) {
|
|
level = 0;
|
|
} else {
|
|
level = get_bits(&s->gb, code);
|
|
if ((level >> (code - 1)) == 0) /* if MSB not set it is negative*/
|
|
level = - (level ^ ((1 << code) - 1));
|
|
if (code > 8)
|
|
skip_bits1(&s->gb); /* marker */
|
|
}
|
|
|
|
pred = mpeg4_pred_dc(s, n, &dc_val, dir_ptr);
|
|
level += pred;
|
|
if (level < 0)
|
|
level = 0;
|
|
if (n < 4) {
|
|
*dc_val = level * s->y_dc_scale;
|
|
} else {
|
|
*dc_val = level * s->c_dc_scale;
|
|
}
|
|
return level;
|
|
}
|
|
|
|
static int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
|
|
int n, int coded)
|
|
{
|
|
int code, level, i, j, last, run;
|
|
int dc_pred_dir;
|
|
RLTable *rl;
|
|
const UINT8 *scan_table;
|
|
|
|
if (s->mb_intra) {
|
|
/* DC coef */
|
|
level = mpeg4_decode_dc(s, n, &dc_pred_dir);
|
|
if (level < 0)
|
|
return -1;
|
|
block[0] = level;
|
|
i = 1;
|
|
if (!coded)
|
|
goto not_coded;
|
|
rl = &rl_intra;
|
|
if (s->ac_pred) {
|
|
if (dc_pred_dir == 0)
|
|
scan_table = ff_alternate_vertical_scan; /* left */
|
|
else
|
|
scan_table = ff_alternate_horizontal_scan; /* top */
|
|
} else {
|
|
scan_table = zigzag_direct;
|
|
}
|
|
} else {
|
|
i = 0;
|
|
if (!coded) {
|
|
s->block_last_index[n] = i - 1;
|
|
return 0;
|
|
}
|
|
rl = &rl_inter;
|
|
scan_table = zigzag_direct;
|
|
}
|
|
|
|
for(;;) {
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
if (code == rl->n) {
|
|
/* escape */
|
|
if (get_bits1(&s->gb) != 0) {
|
|
if (get_bits1(&s->gb) != 0) {
|
|
/* third escape */
|
|
last = get_bits1(&s->gb);
|
|
run = get_bits(&s->gb, 6);
|
|
get_bits1(&s->gb); /* marker */
|
|
level = get_bits(&s->gb, 12);
|
|
level = (level << 20) >> 20; /* sign extend */
|
|
skip_bits1(&s->gb); /* marker */
|
|
} else {
|
|
/* second escape */
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
if (code < 0 || code >= rl->n)
|
|
return -1;
|
|
run = rl->table_run[code];
|
|
level = rl->table_level[code];
|
|
last = code >= rl->last;
|
|
run += rl->max_run[last][level] + 1;
|
|
if (get_bits1(&s->gb))
|
|
level = -level;
|
|
}
|
|
} else {
|
|
/* first escape */
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
if (code < 0 || code >= rl->n)
|
|
return -1;
|
|
run = rl->table_run[code];
|
|
level = rl->table_level[code];
|
|
last = code >= rl->last;
|
|
level += rl->max_level[last][run];
|
|
if (get_bits1(&s->gb))
|
|
level = -level;
|
|
}
|
|
} 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)
|
|
return -1;
|
|
j = scan_table[i];
|
|
block[j] = level;
|
|
i++;
|
|
if (last)
|
|
break;
|
|
}
|
|
not_coded:
|
|
if (s->mb_intra) {
|
|
mpeg4_pred_ac(s, block, n, dc_pred_dir);
|
|
if (s->ac_pred) {
|
|
i = 64; /* XXX: not optimal */
|
|
}
|
|
}
|
|
s->block_last_index[n] = i - 1;
|
|
return 0;
|
|
}
|
|
|
|
/* most is hardcoded. should extend to handle all h263 streams */
|
|
int h263_decode_picture_header(MpegEncContext *s)
|
|
{
|
|
int format, width, height;
|
|
|
|
/* picture header */
|
|
if (get_bits(&s->gb, 22) != 0x20)
|
|
return -1;
|
|
skip_bits(&s->gb, 8); /* picture timestamp */
|
|
|
|
if (get_bits1(&s->gb) != 1)
|
|
return -1; /* marker */
|
|
if (get_bits1(&s->gb) != 0)
|
|
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);
|
|
|
|
if (format != 7) {
|
|
s->h263_plus = 0;
|
|
/* H.263v1 */
|
|
width = h263_format[format][0];
|
|
height = h263_format[format][1];
|
|
if (!width)
|
|
return -1;
|
|
|
|
s->pict_type = I_TYPE + get_bits1(&s->gb);
|
|
|
|
s->unrestricted_mv = get_bits1(&s->gb);
|
|
s->h263_long_vectors = s->unrestricted_mv;
|
|
|
|
if (get_bits1(&s->gb) != 0)
|
|
return -1; /* SAC: off */
|
|
if (get_bits1(&s->gb) != 0)
|
|
return -1; /* advanced prediction mode: off */
|
|
if (get_bits1(&s->gb) != 0)
|
|
return -1; /* not PB frame */
|
|
|
|
s->qscale = get_bits(&s->gb, 5);
|
|
skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
|
|
} else {
|
|
s->h263_plus = 1;
|
|
/* H.263v2 */
|
|
/* OPPTYPE */
|
|
|
|
if (get_bits(&s->gb, 3) != 1) /* Update Full Extended PTYPE */
|
|
return -1;
|
|
format = get_bits(&s->gb, 3);
|
|
|
|
skip_bits(&s->gb,1); /* Custom PCF */
|
|
s->umvplus_dec = get_bits(&s->gb, 1); /* Unrestricted Motion Vector */
|
|
skip_bits(&s->gb, 10);
|
|
skip_bits(&s->gb, 3); /* Reserved */
|
|
|
|
/* MPPTYPE */
|
|
s->pict_type = get_bits(&s->gb, 3) + 1;
|
|
if (s->pict_type != I_TYPE &&
|
|
s->pict_type != P_TYPE)
|
|
return -1;
|
|
skip_bits(&s->gb, 7);
|
|
|
|
/* Get the picture dimensions */
|
|
if (format == 6) {
|
|
/* Custom Picture Format (CPFMT) */
|
|
skip_bits(&s->gb, 4); /* aspect ratio */
|
|
width = (get_bits(&s->gb, 9) + 1) * 4;
|
|
skip_bits1(&s->gb);
|
|
height = get_bits(&s->gb, 9) * 4;
|
|
#ifdef DEBUG
|
|
fprintf(stderr,"\nH.263+ Custom picture: %dx%d\n",width,height);
|
|
#endif
|
|
}
|
|
else {
|
|
width = h263_format[format][0];
|
|
height = h263_format[format][1];
|
|
}
|
|
|
|
if ((width == 0) || (height == 0))
|
|
return -1;
|
|
|
|
if (s->umvplus_dec) {
|
|
skip_bits1(&s->gb); /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
|
|
}
|
|
|
|
s->qscale = get_bits(&s->gb, 5);
|
|
}
|
|
/* PEI */
|
|
while (get_bits1(&s->gb) != 0) {
|
|
skip_bits(&s->gb, 8);
|
|
}
|
|
s->f_code = 1;
|
|
s->width = width;
|
|
s->height = height;
|
|
return 0;
|
|
}
|
|
|
|
/* decode mpeg4 VOP header */
|
|
int mpeg4_decode_picture_header(MpegEncContext * s)
|
|
{
|
|
int time_incr, startcode, state, v;
|
|
|
|
redo:
|
|
/* search next start code */
|
|
align_get_bits(&s->gb);
|
|
state = 0xff;
|
|
for(;;) {
|
|
v = get_bits(&s->gb, 8);
|
|
if (state == 0x000001) {
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
startcode = state;
|
|
break;
|
|
}
|
|
state = ((state << 8) | v) & 0xffffff;
|
|
/* XXX: really detect end of frame */
|
|
if (state == 0)
|
|
return -1;
|
|
}
|
|
|
|
if (startcode == 0x120) {
|
|
int time_increment_resolution, width, height, vo_ver_id;
|
|
|
|
/* vol header */
|
|
skip_bits(&s->gb, 1); /* random access */
|
|
skip_bits(&s->gb, 8); /* vo_type */
|
|
if (get_bits1(&s->gb) != 0) { /* is_ol_id */
|
|
vo_ver_id = get_bits(&s->gb, 4); /* vo_ver_id */
|
|
skip_bits(&s->gb, 3); /* vo_priority */
|
|
} else {
|
|
vo_ver_id = 1;
|
|
}
|
|
|
|
skip_bits(&s->gb, 4); /* aspect_ratio_info */
|
|
skip_bits1(&s->gb); /* vol control parameter */
|
|
s->shape = get_bits(&s->gb, 2); /* vol shape */
|
|
skip_bits1(&s->gb); /* marker */
|
|
|
|
time_increment_resolution = get_bits(&s->gb, 16);
|
|
s->time_increment_bits = av_log2(time_increment_resolution - 1) + 1;
|
|
if (s->time_increment_bits < 1)
|
|
s->time_increment_bits = 1;
|
|
skip_bits1(&s->gb); /* marker */
|
|
|
|
if (get_bits1(&s->gb) != 0) { /* fixed_vop_rate */
|
|
skip_bits(&s->gb, s->time_increment_bits);
|
|
}
|
|
|
|
if (s->shape != 2) {
|
|
if (s->shape == 0) {
|
|
skip_bits1(&s->gb); /* marker */
|
|
width = get_bits(&s->gb, 13);
|
|
skip_bits1(&s->gb); /* marker */
|
|
height = get_bits(&s->gb, 13);
|
|
skip_bits1(&s->gb); /* marker */
|
|
}
|
|
|
|
skip_bits1(&s->gb); /* interlaced */
|
|
skip_bits1(&s->gb); /* OBMC */
|
|
if (vo_ver_id == 1) {
|
|
s->vol_sprite_usage = get_bits1(&s->gb); /* vol_sprite_usage */
|
|
} else {
|
|
s->vol_sprite_usage = get_bits(&s->gb, 2); /* vol_sprite_usage */
|
|
}
|
|
if (get_bits1(&s->gb) == 1) { /* not_8_bit */
|
|
s->quant_precision = get_bits(&s->gb, 4); /* quant_precision */
|
|
skip_bits(&s->gb, 4); /* bits_per_pixel */
|
|
} else {
|
|
s->quant_precision = 5;
|
|
}
|
|
|
|
skip_bits1(&s->gb); /* vol_quant_type */
|
|
skip_bits1(&s->gb); /* vol_quarter_pixel */
|
|
skip_bits1(&s->gb); /* complexity_estimation_disabled */
|
|
skip_bits1(&s->gb); /* resync_marker_disabled */
|
|
skip_bits1(&s->gb); /* data_partioning_enabled */
|
|
if (get_bits1(&s->gb) != 0) { /* scalability */
|
|
printf("bad scalability!!!\n");
|
|
return -1;
|
|
}
|
|
}
|
|
goto redo;
|
|
} else if (startcode != 0x1b6) {
|
|
goto redo;
|
|
}
|
|
|
|
s->pict_type = get_bits(&s->gb, 2) + 1; /* pict type: I = 0 , P = 1 */
|
|
if (s->pict_type != I_TYPE &&
|
|
s->pict_type != P_TYPE)
|
|
return -1;
|
|
|
|
/* XXX: parse time base */
|
|
time_incr = 0;
|
|
while (get_bits1(&s->gb) != 0)
|
|
time_incr++;
|
|
|
|
skip_bits1(&s->gb); /* marker */
|
|
skip_bits(&s->gb, s->time_increment_bits);
|
|
skip_bits1(&s->gb); /* marker */
|
|
/* vop coded */
|
|
if (get_bits1(&s->gb) != 1)
|
|
goto redo;
|
|
|
|
if (s->shape != 2 && s->pict_type == P_TYPE) {
|
|
/* rounding type for motion estimation */
|
|
s->no_rounding = get_bits1(&s->gb);
|
|
} else {
|
|
s->no_rounding = 0;
|
|
}
|
|
|
|
if (s->shape != 0) {
|
|
if (s->vol_sprite_usage != 1 || s->pict_type != I_TYPE) {
|
|
int width, height, hor_spat_ref, ver_spat_ref;
|
|
|
|
width = get_bits(&s->gb, 13);
|
|
skip_bits1(&s->gb); /* marker */
|
|
height = get_bits(&s->gb, 13);
|
|
skip_bits1(&s->gb); /* marker */
|
|
hor_spat_ref = get_bits(&s->gb, 13); /* hor_spat_ref */
|
|
skip_bits1(&s->gb); /* marker */
|
|
ver_spat_ref = get_bits(&s->gb, 13); /* ver_spat_ref */
|
|
}
|
|
skip_bits1(&s->gb); /* change_CR_disable */
|
|
|
|
if (get_bits1(&s->gb) != 0) {
|
|
skip_bits(&s->gb, 8); /* constant_alpha_value */
|
|
}
|
|
}
|
|
|
|
if (s->shape != 2) {
|
|
skip_bits(&s->gb, 3); /* intra dc VLC threshold */
|
|
|
|
/* note: we do not use quant_precision to avoid problem if no
|
|
MPEG4 vol header as it is found on some old opendivx
|
|
movies */
|
|
s->qscale = get_bits(&s->gb, 5);
|
|
|
|
if (s->pict_type != I_TYPE) {
|
|
s->f_code = get_bits(&s->gb, 3); /* fcode_for */
|
|
}
|
|
if (s->shape && (s->pict_type != I_TYPE)) {
|
|
skip_bits1(&s->gb); // vop shape coding type
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* don't understand why they choose a different header ! */
|
|
int intel_h263_decode_picture_header(MpegEncContext *s)
|
|
{
|
|
int format;
|
|
|
|
/* picture header */
|
|
if (get_bits(&s->gb, 22) != 0x20)
|
|
return -1;
|
|
skip_bits(&s->gb, 8); /* picture timestamp */
|
|
|
|
if (get_bits1(&s->gb) != 1)
|
|
return -1; /* marker */
|
|
if (get_bits1(&s->gb) != 0)
|
|
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);
|
|
if (format != 7)
|
|
return -1;
|
|
|
|
s->h263_plus = 0;
|
|
|
|
s->pict_type = I_TYPE + get_bits1(&s->gb);
|
|
|
|
s->unrestricted_mv = get_bits1(&s->gb);
|
|
s->h263_long_vectors = s->unrestricted_mv;
|
|
|
|
if (get_bits1(&s->gb) != 0)
|
|
return -1; /* SAC: off */
|
|
if (get_bits1(&s->gb) != 0)
|
|
return -1; /* advanced prediction mode: off */
|
|
if (get_bits1(&s->gb) != 0)
|
|
return -1; /* not PB frame */
|
|
|
|
/* skip unknown header garbage */
|
|
skip_bits(&s->gb, 41);
|
|
|
|
s->qscale = get_bits(&s->gb, 5);
|
|
skip_bits1(&s->gb); /* Continuous Presence Multipoint mode: off */
|
|
|
|
/* PEI */
|
|
while (get_bits1(&s->gb) != 0) {
|
|
skip_bits(&s->gb, 8);
|
|
}
|
|
s->f_code = 1;
|
|
return 0;
|
|
}
|