mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-09 09:16:59 +02:00
933 lines
24 KiB
C
933 lines
24 KiB
C
/*
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* MSMPEG4 backend for ffmpeg encoder and decoder
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* Copyright (c) 2001 Gerard Lantau.
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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 <stdlib.h>
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#include <stdio.h>
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#include "common.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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/*
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* You can also call this codec : MPEG4 with a twist !
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*
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* TODO:
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* - (encoding) select best mv table (two choices)
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* - (encoding) select best vlc/dc table
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* - (decoding) handle slice indication
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*/
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//#define DEBUG
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/* motion vector table */
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typedef struct MVTable {
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int n;
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const UINT16 *table_mv_code;
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const UINT8 *table_mv_bits;
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const UINT8 *table_mvx;
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const UINT8 *table_mvy;
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UINT16 *table_mv_index; /* encoding: convert mv to index in table_mv */
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VLC vlc; /* decoding: vlc */
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} MVTable;
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static void msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n);
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static int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
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int n, int coded);
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static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
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static int msmpeg4_decode_motion(MpegEncContext * s,
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int *mx_ptr, int *my_ptr);
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#ifdef DEBUG
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int intra_count = 0;
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int frame_count = 0;
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#endif
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/* XXX: move it to mpegvideo.h */
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static int init_done = 0;
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#include "msmpeg4data.h"
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#ifdef STATS
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const char *st_names[ST_NB] = {
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"unknown",
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"dc",
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"intra_ac",
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"inter_ac",
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"intra_mb",
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"inter_mb",
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"mv",
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};
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int st_current_index = 0;
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unsigned int st_bit_counts[ST_NB];
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unsigned int st_out_bit_counts[ST_NB];
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#define set_stat(var) st_current_index = var;
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void print_stats(void)
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{
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unsigned int total;
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int i;
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printf("Input:\n");
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total = 0;
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for(i=0;i<ST_NB;i++)
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total += st_bit_counts[i];
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if (total == 0)
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total = 1;
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for(i=0;i<ST_NB;i++) {
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printf("%-10s : %10.1f %5.1f%%\n",
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st_names[i],
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(double)st_bit_counts[i] / 8.0,
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(double)st_bit_counts[i] * 100.0 / total);
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}
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printf("%-10s : %10.1f %5.1f%%\n",
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"total",
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(double)total / 8.0,
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100.0);
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printf("Output:\n");
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total = 0;
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for(i=0;i<ST_NB;i++)
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total += st_out_bit_counts[i];
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if (total == 0)
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total = 1;
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for(i=0;i<ST_NB;i++) {
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printf("%-10s : %10.1f %5.1f%%\n",
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st_names[i],
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(double)st_out_bit_counts[i] / 8.0,
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(double)st_out_bit_counts[i] * 100.0 / total);
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}
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printf("%-10s : %10.1f %5.1f%%\n",
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"total",
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(double)total / 8.0,
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100.0);
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}
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#else
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#define set_stat(var)
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#endif
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/* build the table which associate a (x,y) motion vector to a vlc */
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static void init_mv_table(MVTable *tab)
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{
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int i, x, y;
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tab->table_mv_index = malloc(sizeof(UINT16) * 4096);
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/* mark all entries as not used */
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for(i=0;i<4096;i++)
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tab->table_mv_index[i] = tab->n;
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for(i=0;i<tab->n;i++) {
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x = tab->table_mvx[i];
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y = tab->table_mvy[i];
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tab->table_mv_index[(x << 6) | y] = i;
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}
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}
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static void code012(PutBitContext *pb, int n)
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{
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if (n == 0) {
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put_bits(pb, 1, 0);
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} else {
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put_bits(pb, 1, 1);
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put_bits(pb, 1, (n >= 2));
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}
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}
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/* write MSMPEG4 V3 compatible frame header */
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void msmpeg4_encode_picture_header(MpegEncContext * s, int picture_number)
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{
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int i;
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align_put_bits(&s->pb);
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put_bits(&s->pb, 2, s->pict_type - 1);
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put_bits(&s->pb, 5, s->qscale);
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s->rl_table_index = 2;
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s->rl_chroma_table_index = 1; /* only for I frame */
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s->dc_table_index = 1;
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s->mv_table_index = 1; /* only if P frame */
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s->use_skip_mb_code = 1; /* only if P frame */
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if (s->pict_type == I_TYPE) {
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put_bits(&s->pb, 5, 0x17); /* indicate only one "slice" */
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code012(&s->pb, s->rl_chroma_table_index);
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code012(&s->pb, s->rl_table_index);
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put_bits(&s->pb, 1, s->dc_table_index);
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s->no_rounding = 1;
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} else {
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put_bits(&s->pb, 1, s->use_skip_mb_code);
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s->rl_chroma_table_index = s->rl_table_index;
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code012(&s->pb, s->rl_table_index);
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put_bits(&s->pb, 1, s->dc_table_index);
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put_bits(&s->pb, 1, s->mv_table_index);
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s->no_rounding ^= 1;
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}
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if (!init_done) {
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/* init various encoding tables */
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init_done = 1;
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init_mv_table(&mv_tables[0]);
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init_mv_table(&mv_tables[1]);
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for(i=0;i<NB_RL_TABLES;i++)
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init_rl(&rl_table[i]);
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}
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#ifdef DEBUG
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intra_count = 0;
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printf("*****frame %d:\n", frame_count++);
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#endif
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}
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/* predict coded block */
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static inline int coded_block_pred(MpegEncContext * s, int n, UINT8 **coded_block_ptr)
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{
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int x, y, wrap, pred, a, b, c;
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x = 2 * s->mb_x + 1 + (n & 1);
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y = 2 * s->mb_y + 1 + ((n & 2) >> 1);
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wrap = s->mb_width * 2 + 2;
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/* B C
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* A X
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*/
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a = s->coded_block[(x - 1) + (y) * wrap];
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b = s->coded_block[(x - 1) + (y - 1) * wrap];
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c = s->coded_block[(x) + (y - 1) * wrap];
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if (b == c) {
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pred = a;
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} else {
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pred = c;
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}
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/* store value */
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*coded_block_ptr = &s->coded_block[(x) + (y) * wrap];
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return pred;
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}
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static void msmpeg4_encode_motion(MpegEncContext * s,
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int mx, int my)
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{
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int code;
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MVTable *mv;
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/* modulo encoding */
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/* WARNING : you cannot reach all the MVs even with the modulo
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encoding. This is a somewhat strange compromise they took !!! */
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if (mx <= -64)
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mx += 64;
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else if (mx >= 64)
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mx -= 64;
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if (my <= -64)
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my += 64;
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else if (my >= 64)
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my -= 64;
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mx += 32;
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my += 32;
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#if 0
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if ((unsigned)mx >= 64 ||
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(unsigned)my >= 64)
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fprintf(stderr, "error mx=%d my=%d\n", mx, my);
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#endif
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mv = &mv_tables[s->mv_table_index];
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code = mv->table_mv_index[(mx << 6) | my];
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set_stat(ST_MV);
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put_bits(&s->pb,
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mv->table_mv_bits[code],
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mv->table_mv_code[code]);
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if (code == mv->n) {
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/* escape : code litterally */
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put_bits(&s->pb, 6, mx);
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put_bits(&s->pb, 6, my);
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}
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}
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void msmpeg4_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 cbp, coded_cbp, i;
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int pred_x, pred_y;
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UINT8 *coded_block;
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if (!s->mb_intra) {
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/* compute cbp */
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set_stat(ST_INTER_MB);
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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 (s->use_skip_mb_code && (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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if (s->use_skip_mb_code)
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put_bits(&s->pb, 1, 0); /* mb coded */
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put_bits(&s->pb,
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table_mb_non_intra[cbp + 64][1],
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table_mb_non_intra[cbp + 64][0]);
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/* motion vector */
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h263_pred_motion(s, 0, &pred_x, &pred_y);
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msmpeg4_encode_motion(s, motion_x - pred_x,
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motion_y - pred_y);
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} else {
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/* compute cbp */
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cbp = 0;
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coded_cbp = 0;
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for (i = 0; i < 6; i++) {
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int val, pred;
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val = (s->block_last_index[i] >= 1);
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cbp |= val << (5 - i);
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if (i < 4) {
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/* predict value for close blocks only for luma */
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pred = coded_block_pred(s, i, &coded_block);
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*coded_block = val;
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val = val ^ pred;
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}
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coded_cbp |= val << (5 - i);
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}
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#if 0
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if (coded_cbp)
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printf("cbp=%x %x\n", cbp, coded_cbp);
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#endif
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if (s->pict_type == I_TYPE) {
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set_stat(ST_INTRA_MB);
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put_bits(&s->pb,
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table_mb_intra[coded_cbp][1], table_mb_intra[coded_cbp][0]);
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} else {
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if (s->use_skip_mb_code)
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put_bits(&s->pb, 1, 0); /* mb coded */
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put_bits(&s->pb,
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table_mb_non_intra[cbp][1],
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table_mb_non_intra[cbp][0]);
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}
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set_stat(ST_INTRA_MB);
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put_bits(&s->pb, 1, 0); /* no AC prediction yet */
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}
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for (i = 0; i < 6; i++) {
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msmpeg4_encode_block(s, block[i], i);
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}
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}
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/* strongly inspirated from MPEG4, but not exactly the same ! */
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void msmpeg4_dc_scale(MpegEncContext * s)
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{
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int scale;
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if (s->qscale < 5)
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scale = 8;
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else if (s->qscale < 9)
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scale = 2 * s->qscale;
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else
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scale = s->qscale + 8;
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s->y_dc_scale = scale;
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s->c_dc_scale = (s->qscale + 13) / 2;
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}
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/* dir = 0: left, dir = 1: top prediction */
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static int msmpeg4_pred_dc(MpegEncContext * s, int n,
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UINT16 **dc_val_ptr, int *dir_ptr)
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{
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int a, b, c, x, y, wrap, pred, scale;
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UINT16 *dc_val;
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/* find prediction */
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if (n < 4) {
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x = 2 * s->mb_x + 1 + (n & 1);
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y = 2 * s->mb_y + 1 + ((n & 2) >> 1);
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wrap = s->mb_width * 2 + 2;
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dc_val = s->dc_val[0];
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scale = s->y_dc_scale;
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} else {
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x = s->mb_x + 1;
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y = s->mb_y + 1;
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wrap = s->mb_width + 2;
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dc_val = s->dc_val[n - 4 + 1];
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scale = s->c_dc_scale;
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}
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/* B C
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* A X
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*/
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a = dc_val[(x - 1) + (y) * wrap];
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b = dc_val[(x - 1) + (y - 1) * wrap];
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c = dc_val[(x) + (y - 1) * wrap];
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/* XXX: the following solution consumes divisions, but it does not
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necessitate to modify mpegvideo.c. The problem comes from the
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fact they decided to store the quantized DC (which would lead
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to problems if Q could vary !) */
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a = (a + (scale >> 1)) / scale;
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b = (b + (scale >> 1)) / scale;
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c = (c + (scale >> 1)) / scale;
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/* XXX: WARNING: they did not choose the same test as MPEG4. This
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is very important ! */
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if (abs(a - b) <= abs(b - c)) {
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pred = c;
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*dir_ptr = 1;
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} else {
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pred = a;
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*dir_ptr = 0;
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}
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/* update predictor */
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*dc_val_ptr = &dc_val[(x) + (y) * wrap];
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return pred;
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}
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#define DC_MAX 119
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static void msmpeg4_encode_dc(MpegEncContext * s, int level, int n, int *dir_ptr)
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{
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int sign, code;
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int pred;
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UINT16 *dc_val;
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pred = msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
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/* update predictor */
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if (n < 4) {
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*dc_val = level * s->y_dc_scale;
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} else {
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*dc_val = level * s->c_dc_scale;
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}
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/* do the prediction */
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level -= pred;
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sign = 0;
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if (level < 0) {
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level = -level;
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sign = 1;
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}
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code = level;
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if (code > DC_MAX)
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code = DC_MAX;
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if (s->dc_table_index == 0) {
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if (n < 4) {
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put_bits(&s->pb, table0_dc_lum[code][1], table0_dc_lum[code][0]);
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} else {
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put_bits(&s->pb, table0_dc_chroma[code][1], table0_dc_chroma[code][0]);
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}
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} else {
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if (n < 4) {
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put_bits(&s->pb, table1_dc_lum[code][1], table1_dc_lum[code][0]);
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} else {
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put_bits(&s->pb, table1_dc_chroma[code][1], table1_dc_chroma[code][0]);
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}
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}
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if (code == DC_MAX)
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put_bits(&s->pb, 8, level);
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if (level != 0) {
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put_bits(&s->pb, 1, sign);
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}
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}
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/* Encoding of a block. Very similar to MPEG4 except for a different
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escape coding (same as H263) and more vlc tables.
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*/
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static void msmpeg4_encode_block(MpegEncContext * s, DCTELEM * block, int n)
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{
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int level, run, last, i, j, last_index;
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int last_non_zero, sign, slevel;
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int code, run_diff, dc_pred_dir;
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const RLTable *rl;
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if (s->mb_intra) {
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set_stat(ST_DC);
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msmpeg4_encode_dc(s, block[0], n, &dc_pred_dir);
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i = 1;
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if (n < 4) {
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rl = &rl_table[s->rl_table_index];
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} else {
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rl = &rl_table[3 + s->rl_chroma_table_index];
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}
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run_diff = 0;
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set_stat(ST_INTRA_AC);
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} else {
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i = 0;
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rl = &rl_table[3 + s->rl_table_index];
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run_diff = 1;
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set_stat(ST_INTER_AC);
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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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int level1, run1;
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|
|
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, 0);
|
|
if (level > MAX_LEVEL)
|
|
goto esc3;
|
|
run1 = run - rl->max_run[last][level] - run_diff;
|
|
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, 0);
|
|
put_bits(&s->pb, 1, last);
|
|
put_bits(&s->pb, 6, run);
|
|
put_bits(&s->pb, 8, slevel & 0xff);
|
|
} else {
|
|
/* second escape */
|
|
put_bits(&s->pb, 1, 1);
|
|
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, 1);
|
|
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 stuff */
|
|
|
|
static VLC mb_non_intra_vlc;
|
|
static VLC mb_intra_vlc;
|
|
static VLC dc_lum_vlc[2];
|
|
static VLC dc_chroma_vlc[2];
|
|
|
|
/* init all vlc decoding tables */
|
|
int msmpeg4_decode_init_vlc(MpegEncContext *s)
|
|
{
|
|
int i;
|
|
MVTable *mv;
|
|
|
|
for(i=0;i<NB_RL_TABLES;i++) {
|
|
init_rl(&rl_table[i]);
|
|
init_vlc_rl(&rl_table[i]);
|
|
}
|
|
for(i=0;i<2;i++) {
|
|
mv = &mv_tables[i];
|
|
init_vlc(&mv->vlc, 9, mv->n + 1,
|
|
mv->table_mv_bits, 1, 1,
|
|
mv->table_mv_code, 2, 2);
|
|
}
|
|
|
|
init_vlc(&dc_lum_vlc[0], 9, 120,
|
|
&table0_dc_lum[0][1], 8, 4,
|
|
&table0_dc_lum[0][0], 8, 4);
|
|
init_vlc(&dc_chroma_vlc[0], 9, 120,
|
|
&table0_dc_chroma[0][1], 8, 4,
|
|
&table0_dc_chroma[0][0], 8, 4);
|
|
init_vlc(&dc_lum_vlc[1], 9, 120,
|
|
&table1_dc_lum[0][1], 8, 4,
|
|
&table1_dc_lum[0][0], 8, 4);
|
|
init_vlc(&dc_chroma_vlc[1], 9, 120,
|
|
&table1_dc_chroma[0][1], 8, 4,
|
|
&table1_dc_chroma[0][0], 8, 4);
|
|
|
|
init_vlc(&mb_non_intra_vlc, 9, 128,
|
|
&table_mb_non_intra[0][1], 8, 4,
|
|
&table_mb_non_intra[0][0], 8, 4);
|
|
init_vlc(&mb_intra_vlc, 9, 128,
|
|
&table_mb_intra[0][1], 4, 2,
|
|
&table_mb_intra[0][0], 4, 2);
|
|
return 0;
|
|
}
|
|
|
|
static int decode012(GetBitContext *gb)
|
|
{
|
|
int n;
|
|
n = get_bits(gb, 1);
|
|
if (n == 0)
|
|
return 0;
|
|
else
|
|
return get_bits(gb, 1) + 1;
|
|
}
|
|
|
|
int msmpeg4_decode_picture_header(MpegEncContext * s)
|
|
{
|
|
int code;
|
|
|
|
s->pict_type = get_bits(&s->gb, 2) + 1;
|
|
if (s->pict_type != I_TYPE &&
|
|
s->pict_type != P_TYPE)
|
|
return -1;
|
|
|
|
s->qscale = get_bits(&s->gb, 5);
|
|
|
|
if (s->pict_type == I_TYPE) {
|
|
code = get_bits(&s->gb, 5);
|
|
/* 0x17: one slice, 0x18: three slices */
|
|
/* XXX: implement it */
|
|
if (code < 0x17)
|
|
return -1;
|
|
s->slice_height = s->mb_height / (code - 0x16);
|
|
s->rl_chroma_table_index = decode012(&s->gb);
|
|
s->rl_table_index = decode012(&s->gb);
|
|
|
|
s->dc_table_index = get_bits(&s->gb, 1);
|
|
s->no_rounding = 1;
|
|
} else {
|
|
s->use_skip_mb_code = get_bits(&s->gb, 1);
|
|
|
|
s->rl_table_index = decode012(&s->gb);
|
|
s->rl_chroma_table_index = s->rl_table_index;
|
|
|
|
s->dc_table_index = get_bits(&s->gb, 1);
|
|
|
|
s->mv_table_index = get_bits(&s->gb, 1);
|
|
s->no_rounding ^= 1;
|
|
}
|
|
#ifdef DEBUG
|
|
printf("*****frame %d:\n", frame_count++);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
void memsetw(short *tab, int val, int n)
|
|
{
|
|
int i;
|
|
for(i=0;i<n;i++)
|
|
tab[i] = val;
|
|
}
|
|
|
|
int msmpeg4_decode_mb(MpegEncContext *s,
|
|
DCTELEM block[6][64])
|
|
{
|
|
int cbp, code, i;
|
|
int pred, val;
|
|
UINT8 *coded_val;
|
|
|
|
/* special slice handling */
|
|
if (s->mb_x == 0) {
|
|
if ((s->mb_y % s->slice_height) == 0) {
|
|
int wrap;
|
|
/* reset DC pred (set previous line to 1024) */
|
|
wrap = 2 * s->mb_width + 2;
|
|
memsetw(&s->dc_val[0][(1) + (2 * s->mb_y) * wrap],
|
|
1024, 2 * s->mb_width);
|
|
wrap = s->mb_width + 2;
|
|
memsetw(&s->dc_val[1][(1) + (s->mb_y) * wrap],
|
|
1024, s->mb_width);
|
|
memsetw(&s->dc_val[2][(1) + (s->mb_y) * wrap],
|
|
1024, s->mb_width);
|
|
|
|
s->first_slice_line = 1;
|
|
} else {
|
|
s->first_slice_line = 0;
|
|
}
|
|
}
|
|
|
|
if (s->pict_type == P_TYPE) {
|
|
set_stat(ST_INTER_MB);
|
|
if (s->use_skip_mb_code) {
|
|
if (get_bits(&s->gb, 1)) {
|
|
/* 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;
|
|
}
|
|
}
|
|
|
|
code = get_vlc(&s->gb, &mb_non_intra_vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
if (code & 0x40)
|
|
s->mb_intra = 0;
|
|
else
|
|
s->mb_intra = 1;
|
|
|
|
cbp = code & 0x3f;
|
|
} else {
|
|
set_stat(ST_INTRA_MB);
|
|
s->mb_intra = 1;
|
|
code = get_vlc(&s->gb, &mb_intra_vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
/* predict coded block pattern */
|
|
cbp = 0;
|
|
for(i=0;i<6;i++) {
|
|
val = ((code >> (5 - i)) & 1);
|
|
if (i < 4) {
|
|
pred = coded_block_pred(s, i, &coded_val);
|
|
val = val ^ pred;
|
|
*coded_val = val;
|
|
}
|
|
cbp |= val << (5 - i);
|
|
}
|
|
}
|
|
|
|
if (!s->mb_intra) {
|
|
int mx, my;
|
|
set_stat(ST_MV);
|
|
h263_pred_motion(s, 0, &mx, &my);
|
|
if (msmpeg4_decode_motion(s, &mx, &my) < 0)
|
|
return -1;
|
|
s->mv_dir = MV_DIR_FORWARD;
|
|
s->mv_type = MV_TYPE_16X16;
|
|
s->mv[0][0][0] = mx;
|
|
s->mv[0][0][1] = my;
|
|
} else {
|
|
set_stat(ST_INTRA_MB);
|
|
s->ac_pred = get_bits(&s->gb, 1);
|
|
}
|
|
|
|
for (i = 0; i < 6; i++) {
|
|
if (msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1) < 0)
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int msmpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
|
|
int n, int coded)
|
|
{
|
|
int code, level, i, j, last, run, run_diff;
|
|
int dc_pred_dir;
|
|
RLTable *rl;
|
|
const UINT8 *scan_table;
|
|
|
|
if (s->mb_intra) {
|
|
/* DC coef */
|
|
set_stat(ST_DC);
|
|
level = msmpeg4_decode_dc(s, n, &dc_pred_dir);
|
|
if (level < 0)
|
|
return -1;
|
|
block[0] = level;
|
|
if (n < 4) {
|
|
rl = &rl_table[s->rl_table_index];
|
|
} else {
|
|
rl = &rl_table[3 + s->rl_chroma_table_index];
|
|
}
|
|
run_diff = 0;
|
|
i = 1;
|
|
if (!coded) {
|
|
goto not_coded;
|
|
}
|
|
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;
|
|
}
|
|
set_stat(ST_INTRA_AC);
|
|
} else {
|
|
i = 0;
|
|
rl = &rl_table[3 + s->rl_table_index];
|
|
run_diff = 1;
|
|
if (!coded) {
|
|
s->block_last_index[n] = i - 1;
|
|
return 0;
|
|
}
|
|
scan_table = zigzag_direct;
|
|
set_stat(ST_INTER_AC);
|
|
}
|
|
|
|
for(;;) {
|
|
code = get_vlc(&s->gb, &rl->vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
if (code == rl->n) {
|
|
/* escape */
|
|
if (get_bits(&s->gb, 1) == 0) {
|
|
if (get_bits(&s->gb, 1) == 0) {
|
|
/* third escape */
|
|
last = get_bits(&s->gb, 1);
|
|
run = get_bits(&s->gb, 6);
|
|
level = get_bits(&s->gb, 8);
|
|
level = (level << 24) >> 24; /* sign extend */
|
|
} 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] + run_diff;
|
|
if (get_bits(&s->gb, 1))
|
|
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_bits(&s->gb, 1))
|
|
level = -level;
|
|
}
|
|
} else {
|
|
run = rl->table_run[code];
|
|
level = rl->table_level[code];
|
|
last = code >= rl->last;
|
|
if (get_bits(&s->gb, 1))
|
|
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;
|
|
}
|
|
|
|
static int msmpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr)
|
|
{
|
|
int level, pred;
|
|
UINT16 *dc_val;
|
|
|
|
if (n < 4) {
|
|
level = get_vlc(&s->gb, &dc_lum_vlc[s->dc_table_index]);
|
|
} else {
|
|
level = get_vlc(&s->gb, &dc_chroma_vlc[s->dc_table_index]);
|
|
}
|
|
if (level < 0)
|
|
return -1;
|
|
|
|
if (level == DC_MAX) {
|
|
level = get_bits(&s->gb, 8);
|
|
if (get_bits(&s->gb, 1))
|
|
level = -level;
|
|
} else if (level != 0) {
|
|
if (get_bits(&s->gb, 1))
|
|
level = -level;
|
|
}
|
|
|
|
pred = msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
|
|
level += pred;
|
|
|
|
/* update predictor */
|
|
if (n < 4) {
|
|
*dc_val = level * s->y_dc_scale;
|
|
} else {
|
|
*dc_val = level * s->c_dc_scale;
|
|
}
|
|
|
|
return level;
|
|
}
|
|
|
|
static int msmpeg4_decode_motion(MpegEncContext * s,
|
|
int *mx_ptr, int *my_ptr)
|
|
{
|
|
MVTable *mv;
|
|
int code, mx, my;
|
|
|
|
mv = &mv_tables[s->mv_table_index];
|
|
|
|
code = get_vlc(&s->gb, &mv->vlc);
|
|
if (code < 0)
|
|
return -1;
|
|
if (code == mv->n) {
|
|
mx = get_bits(&s->gb, 6);
|
|
my = get_bits(&s->gb, 6);
|
|
} else {
|
|
mx = mv->table_mvx[code];
|
|
my = mv->table_mvy[code];
|
|
}
|
|
|
|
mx += *mx_ptr - 32;
|
|
my += *my_ptr - 32;
|
|
/* WARNING : they do not do exactly modulo encoding */
|
|
if (mx <= -64)
|
|
mx += 64;
|
|
else if (mx >= 64)
|
|
mx -= 64;
|
|
|
|
if (my <= -64)
|
|
my += 64;
|
|
else if (my >= 64)
|
|
my -= 64;
|
|
*mx_ptr = mx;
|
|
*my_ptr = my;
|
|
return 0;
|
|
}
|