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FFmpeg/libavcodec/msmpeg4dec.c
Andreas Rheinhardt 3c06d87c93 avcodec/mpegvideo: Move fields to {H263Dec,MPVEnc}Context when possible 
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2025-07-03 20:35:31 +02:00

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/*
* MSMPEG4 backend for encoder and decoder
* Copyright (c) 2001 Fabrice Bellard
* Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
*
* msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/thread.h"
#include "avcodec.h"
#include "codec_internal.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "mpegvideodec.h"
#include "msmpeg4.h"
#include "msmpeg4dec.h"
#include "libavutil/imgutils.h"
#include "h263.h"
#include "h263data.h"
#include "h263dec.h"
#include "mpeg4videodec.h"
#include "msmpeg4data.h"
#include "msmpeg4_vc1_data.h"
#define V2_INTRA_CBPC_VLC_BITS 3
#define V2_MB_TYPE_VLC_BITS 7
#define MV_VLC_BITS 9
#define TEX_VLC_BITS 9
#define DEFAULT_INTER_INDEX 3
static const VLCElem *mv_tables[2];
static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
int32_t **dc_val_ptr)
{
int i;
if (n < 4) {
i= 0;
} else {
i= n-3;
}
*dc_val_ptr= &s->last_dc[i];
return s->last_dc[i];
}
/****************************************/
/* decoding stuff */
const VLCElem *ff_mb_non_intra_vlc[4];
static VLCElem v2_dc_lum_vlc[1472];
static VLCElem v2_dc_chroma_vlc[1506];
static VLCElem v2_intra_cbpc_vlc[8];
static VLCElem v2_mb_type_vlc[128];
VLCElem ff_inter_intra_vlc[8];
/* This is identical to H.263 except that its range is multiplied by 2. */
static int msmpeg4v2_decode_motion(H263DecContext *const h, int pred, int f_code)
{
int code, val, sign, shift;
code = get_vlc2(&h->gb, ff_h263_mv_vlc, H263_MV_VLC_BITS, 2);
ff_dlog(h->c.avctx, "MV code %d at %d %d pred: %d\n",
code, h->c.mb_x,h->c.mb_y, pred);
if (code < 0)
return 0xffff;
if (code == 0)
return pred;
sign = get_bits1(&h->gb);
shift = f_code - 1;
val = code;
if (shift) {
val = (val - 1) << shift;
val |= get_bits(&h->gb, shift);
val++;
}
if (sign)
val = -val;
val += pred;
if (val <= -64)
val += 64;
else if (val >= 64)
val -= 64;
return val;
}
static int msmpeg4v12_decode_mb(H263DecContext *const h)
{
MSMP4DecContext *const ms = mpv_to_msmpeg4(h);
int cbp, code, i;
uint32_t * const mb_type_ptr = &h->c.cur_pic.mb_type[h->c.mb_x + h->c.mb_y*h->c.mb_stride];
if (h->c.pict_type == AV_PICTURE_TYPE_P) {
if (ms->use_skip_mb_code) {
if (get_bits1(&h->gb)) {
/* skip mb */
h->c.mb_intra = 0;
for(i=0;i<6;i++)
h->c.block_last_index[i] = -1;
h->c.mv_dir = MV_DIR_FORWARD;
h->c.mv_type = MV_TYPE_16X16;
h->c.mv[0][0][0] = 0;
h->c.mv[0][0][1] = 0;
h->c.mb_skipped = 1;
*mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
return 0;
}
}
if (h->c.msmpeg4_version == MSMP4_V2)
code = get_vlc2(&h->gb, v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 1);
else
code = get_vlc2(&h->gb, ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 2);
if(code<0 || code>7){
av_log(h->c.avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n",
code, h->c.mb_x, h->c.mb_y);
return -1;
}
h->c.mb_intra = code >>2;
cbp = code & 0x3;
} else {
h->c.mb_intra = 1;
if (h->c.msmpeg4_version == MSMP4_V2)
cbp = get_vlc2(&h->gb, v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 1);
else
cbp = get_vlc2(&h->gb, ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 2);
if(cbp<0 || cbp>3){
av_log(h->c.avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n",
cbp, h->c.mb_x, h->c.mb_y);
return -1;
}
}
if (!h->c.mb_intra) {
int mx, my, cbpy;
cbpy = get_vlc2(&h->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
if(cbpy<0){
av_log(h->c.avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n",
cbp, h->c.mb_x, h->c.mb_y);
return -1;
}
cbp|= cbpy<<2;
if (h->c.msmpeg4_version == MSMP4_V1 || (cbp&3) != 3)
cbp ^= 0x3C;
ff_h263_pred_motion(&h->c, 0, 0, &mx, &my);
mx = msmpeg4v2_decode_motion(h, mx, 1);
my = msmpeg4v2_decode_motion(h, my, 1);
h->c.mv_dir = MV_DIR_FORWARD;
h->c.mv_type = MV_TYPE_16X16;
h->c.mv[0][0][0] = mx;
h->c.mv[0][0][1] = my;
*mb_type_ptr = MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
} else {
int v;
if (h->c.msmpeg4_version == MSMP4_V2) {
h->c.ac_pred = get_bits1(&h->gb);
v = get_vlc2(&h->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
if (v < 0) {
av_log(h->c.avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
return -1;
}
cbp|= v<<2;
} else{
h->c.ac_pred = 0;
v = get_vlc2(&h->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
if (v < 0) {
av_log(h->c.avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
return -1;
}
cbp|= v<<2;
if (h->c.pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
}
*mb_type_ptr = MB_TYPE_INTRA;
}
h->c.bdsp.clear_blocks(h->block[0]);
for (i = 0; i < 6; i++) {
if (ff_msmpeg4_decode_block(ms, h->block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
{
av_log(h->c.avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n",
h->c.mb_x, h->c.mb_y, i);
return -1;
}
}
return 0;
}
static int msmpeg4v34_decode_mb(H263DecContext *const h)
{
MSMP4DecContext *const ms = mpv_to_msmpeg4(h);
int cbp, code, i;
uint8_t *coded_val;
uint32_t * const mb_type_ptr = &h->c.cur_pic.mb_type[h->c.mb_x + h->c.mb_y*h->c.mb_stride];
if (get_bits_left(&h->gb) <= 0)
return AVERROR_INVALIDDATA;
if (h->c.pict_type == AV_PICTURE_TYPE_P) {
if (ms->use_skip_mb_code) {
if (get_bits1(&h->gb)) {
/* skip mb */
h->c.mb_intra = 0;
for(i=0;i<6;i++)
h->c.block_last_index[i] = -1;
h->c.mv_dir = MV_DIR_FORWARD;
h->c.mv_type = MV_TYPE_16X16;
h->c.mv[0][0][0] = 0;
h->c.mv[0][0][1] = 0;
h->c.mb_skipped = 1;
*mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
return 0;
}
}
code = get_vlc2(&h->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX], MB_NON_INTRA_VLC_BITS, 3);
//h->c.mb_intra = (code & 0x40) ? 0 : 1;
h->c.mb_intra = (~code & 0x40) >> 6;
cbp = code & 0x3f;
} else {
h->c.mb_intra = 1;
code = get_vlc2(&h->gb, ff_msmp4_mb_i_vlc, MSMP4_MB_INTRA_VLC_BITS, 2);
/* predict coded block pattern */
cbp = 0;
for(i=0;i<6;i++) {
int val = ((code >> (5 - i)) & 1);
if (i < 4) {
int pred = ff_msmpeg4_coded_block_pred(&h->c, i, &coded_val);
val = val ^ pred;
*coded_val = val;
}
cbp |= val << (5 - i);
}
}
if (!h->c.mb_intra) {
int mx, my;
if (ms->per_mb_rl_table && cbp) {
ms->rl_table_index = decode012(&h->gb);
ms->rl_chroma_table_index = ms->rl_table_index;
}
ff_h263_pred_motion(&h->c, 0, 0, &mx, &my);
ff_msmpeg4_decode_motion(ms, &mx, &my);
h->c.mv_dir = MV_DIR_FORWARD;
h->c.mv_type = MV_TYPE_16X16;
h->c.mv[0][0][0] = mx;
h->c.mv[0][0][1] = my;
*mb_type_ptr = MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
} else {
ff_dlog(h->c.avctx, "I at %d %d %d %06X\n", h->c.mb_x, h->c.mb_y,
((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
show_bits(&h->gb, 24));
h->c.ac_pred = get_bits1(&h->gb);
*mb_type_ptr = MB_TYPE_INTRA;
if (h->c.inter_intra_pred) {
h->c.h263_aic_dir = get_vlc2(&h->gb, ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 1);
ff_dlog(h->c.avctx, "%d%d %d %d/",
h->c.ac_pred, h->c.h263_aic_dir, h->c.mb_x, h->c.mb_y);
}
if (ms->per_mb_rl_table && cbp) {
ms->rl_table_index = decode012(&h->gb);
ms->rl_chroma_table_index = ms->rl_table_index;
}
}
h->c.bdsp.clear_blocks(h->block[0]);
for (i = 0; i < 6; i++) {
if (ff_msmpeg4_decode_block(ms, h->block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
{
av_log(h->c.avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n",
h->c.mb_x, h->c.mb_y, i);
return -1;
}
}
return 0;
}
/* init all vlc decoding tables */
static av_cold void msmpeg4_decode_init_static(void)
{
static VLCElem vlc_buf[3714 + 2694 + 1636 + 2648 + 1532 + 2488];
VLCInitState state = VLC_INIT_STATE(vlc_buf);
INIT_FIRST_VLC_RL(ff_rl_table[0], 642);
INIT_FIRST_VLC_RL(ff_rl_table[1], 1104);
INIT_FIRST_VLC_RL(ff_rl_table[2], 554);
VLC_INIT_RL(ff_rl_table[3], 940);
VLC_INIT_RL(ff_rl_table[4], 962);
/* ff_rl_table[5] coincides with ff_h263_rl_inter which has just been
* initialized in ff_h263_decode_init() earlier. So just copy the VLCs. */
av_assert1(ff_h263_rl_inter.rl_vlc[0]);
memcpy(ff_rl_table[5].rl_vlc, ff_h263_rl_inter.rl_vlc, sizeof(ff_rl_table[5].rl_vlc));
VLC_INIT_STATIC_TABLE(v2_dc_lum_vlc, MSMP4_DC_VLC_BITS, 512,
&ff_v2_dc_lum_table[0][1], 8, 4,
&ff_v2_dc_lum_table[0][0], 8, 4, 0);
VLC_INIT_STATIC_TABLE(v2_dc_chroma_vlc, MSMP4_DC_VLC_BITS, 512,
&ff_v2_dc_chroma_table[0][1], 8, 4,
&ff_v2_dc_chroma_table[0][0], 8, 4, 0);
VLC_INIT_STATIC_TABLE(v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
&ff_v2_intra_cbpc[0][1], 2, 1,
&ff_v2_intra_cbpc[0][0], 2, 1, 0);
VLC_INIT_STATIC_TABLE(v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
&ff_v2_mb_type[0][1], 2, 1,
&ff_v2_mb_type[0][0], 2, 1, 0);
mv_tables[0] = ff_vlc_init_tables_from_lengths(&state, MV_VLC_BITS,
MSMPEG4_MV_TABLES_NB_ELEMS,
ff_msmp4_mv_table0_lens, 1,
ff_msmp4_mv_table0, 2, 2,
0, 0);
mv_tables[1] = ff_vlc_init_tables_from_lengths(&state, MV_VLC_BITS,
MSMPEG4_MV_TABLES_NB_ELEMS,
ff_msmp4_mv_table1_lens, 1,
ff_msmp4_mv_table1, 2, 2,
0, 0);
for (unsigned i = 0; i < 4; i++) {
ff_mb_non_intra_vlc[i] =
ff_vlc_init_tables_sparse(&state, MB_NON_INTRA_VLC_BITS, 128,
&ff_wmv2_inter_table[i][0][1], 8, 4,
&ff_wmv2_inter_table[i][0][0], 8, 4,
NULL, 0, 0, 0);
}
VLC_INIT_STATIC_TABLE(ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
&ff_table_inter_intra[0][1], 2, 1,
&ff_table_inter_intra[0][0], 2, 1, 0);
ff_msmp4_vc1_vlcs_init_once();
}
static int msmpeg4_decode_picture_header(H263DecContext *const h)
{
MSMP4DecContext *const ms = mpv_to_msmpeg4(h);
int code;
// at minimum one bit per macroblock is required at least in a valid frame,
// we discard frames much smaller than this. Frames smaller than 1/8 of the
// smallest "black/skip" frame generally contain not much recoverable content
// while at the same time they have the highest computational requirements
// per byte
if (get_bits_left(&h->gb) * 8LL < (h->c.width+15)/16 * ((h->c.height+15)/16))
return AVERROR_INVALIDDATA;
if (h->c.msmpeg4_version == MSMP4_V1) {
int start_code = get_bits_long(&h->gb, 32);
if(start_code!=0x00000100){
av_log(h->c.avctx, AV_LOG_ERROR, "invalid startcode\n");
return -1;
}
skip_bits(&h->gb, 5); // frame number */
}
h->c.pict_type = get_bits(&h->gb, 2) + 1;
if (h->c.pict_type != AV_PICTURE_TYPE_I &&
h->c.pict_type != AV_PICTURE_TYPE_P){
av_log(h->c.avctx, AV_LOG_ERROR, "invalid picture type\n");
return -1;
}
h->c.chroma_qscale = h->c.qscale = get_bits(&h->gb, 5);
if (h->c.qscale == 0) {
av_log(h->c.avctx, AV_LOG_ERROR, "invalid qscale\n");
return -1;
}
if (h->c.pict_type == AV_PICTURE_TYPE_I) {
code = get_bits(&h->gb, 5);
if (h->c.msmpeg4_version == MSMP4_V1) {
if(code==0 || code>h->c.mb_height) {
av_log(h->c.avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
return -1;
}
h->slice_height = code;
}else{
/* 0x17: one slice, 0x18: two slices, ... */
if (code < 0x17){
av_log(h->c.avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
return -1;
}
h->slice_height = h->c.mb_height / (code - 0x16);
}
switch (h->c.msmpeg4_version) {
case MSMP4_V1:
case MSMP4_V2:
ms->rl_chroma_table_index = 2;
ms->rl_table_index = 2;
ms->dc_table_index = 0; //not used
break;
case MSMP4_V3:
ms->rl_chroma_table_index = decode012(&h->gb);
ms->rl_table_index = decode012(&h->gb);
ms->dc_table_index = get_bits1(&h->gb);
break;
case MSMP4_WMV1:
ff_msmpeg4_decode_ext_header(h, (2+5+5+17+7)/8);
if (ms->bit_rate > MBAC_BITRATE)
ms->per_mb_rl_table = get_bits1(&h->gb);
else
ms->per_mb_rl_table = 0;
if (!ms->per_mb_rl_table) {
ms->rl_chroma_table_index = decode012(&h->gb);
ms->rl_table_index = decode012(&h->gb);
}
ms->dc_table_index = get_bits1(&h->gb);
h->c.inter_intra_pred= 0;
break;
default:
av_unreachable("msmpeg4_decode_picture_header() only used by MSMP4V1-3, WMV1");
}
h->c.no_rounding = 1;
if (h->c.avctx->debug & FF_DEBUG_PICT_INFO)
av_log(h->c.avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
h->c.qscale,
ms->rl_chroma_table_index,
ms->rl_table_index,
ms->dc_table_index,
ms->per_mb_rl_table,
h->slice_height);
} else {
switch (h->c.msmpeg4_version) {
case MSMP4_V1:
case MSMP4_V2:
if (h->c.msmpeg4_version == MSMP4_V1)
ms->use_skip_mb_code = 1;
else
ms->use_skip_mb_code = get_bits1(&h->gb);
ms->rl_table_index = 2;
ms->rl_chroma_table_index = ms->rl_table_index;
ms->dc_table_index = 0; //not used
ms->mv_table_index = 0;
break;
case MSMP4_V3:
ms->use_skip_mb_code = get_bits1(&h->gb);
ms->rl_table_index = decode012(&h->gb);
ms->rl_chroma_table_index = ms->rl_table_index;
ms->dc_table_index = get_bits1(&h->gb);
ms->mv_table_index = get_bits1(&h->gb);
break;
case MSMP4_WMV1:
ms->use_skip_mb_code = get_bits1(&h->gb);
if (ms->bit_rate > MBAC_BITRATE)
ms->per_mb_rl_table = get_bits1(&h->gb);
else
ms->per_mb_rl_table = 0;
if (!ms->per_mb_rl_table) {
ms->rl_table_index = decode012(&h->gb);
ms->rl_chroma_table_index = ms->rl_table_index;
}
ms->dc_table_index = get_bits1(&h->gb);
ms->mv_table_index = get_bits1(&h->gb);
h->c.inter_intra_pred = h->c.width*h->c.height < 320*240 &&
ms->bit_rate <= II_BITRATE;
break;
default:
av_unreachable("msmpeg4_decode_picture_header() only used by MSMP4V1-3, WMV1");
}
if (h->c.avctx->debug&FF_DEBUG_PICT_INFO)
av_log(h->c.avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
ms->use_skip_mb_code,
ms->rl_table_index,
ms->rl_chroma_table_index,
ms->dc_table_index,
ms->mv_table_index,
ms->per_mb_rl_table,
h->c.qscale);
if (ms->flipflop_rounding) {
h->c.no_rounding ^= 1;
}else{
h->c.no_rounding = 0;
}
}
ff_dlog(h->c.avctx, "%d %d %d %d %d\n", h->c.pict_type, ms->bit_rate,
h->c.inter_intra_pred, h->c.width, h->c.height);
ms->esc3_level_length = 0;
ms->esc3_run_length = 0;
return 0;
}
int ff_msmpeg4_decode_ext_header(H263DecContext *const h, int buf_size)
{
MSMP4DecContext *const ms = mpv_to_msmpeg4(h);
int left = buf_size*8 - get_bits_count(&h->gb);
int length = h->c.msmpeg4_version >= MSMP4_V3 ? 17 : 16;
/* the alt_bitstream reader could read over the end so we need to check it */
if(left>=length && left<length+8)
{
skip_bits(&h->gb, 5); /* fps */
ms->bit_rate = get_bits(&h->gb, 11) * 1024;
if (h->c.msmpeg4_version >= MSMP4_V3)
ms->flipflop_rounding = get_bits1(&h->gb);
else
ms->flipflop_rounding = 0;
}
else if(left<length+8)
{
ms->flipflop_rounding = 0;
if (h->c.msmpeg4_version != MSMP4_V2)
av_log(h->c.avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
}
else
{
av_log(h->c.avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
}
return 0;
}
static int msmpeg4_decode_dc(MSMP4DecContext *const ms, int n, int *dir_ptr)
{
H263DecContext *const h = &ms->h;
int level, pred;
if (h->c.msmpeg4_version <= MSMP4_V2) {
if (n < 4) {
level = get_vlc2(&h->gb, v2_dc_lum_vlc, MSMP4_DC_VLC_BITS, 3);
} else {
level = get_vlc2(&h->gb, v2_dc_chroma_vlc, MSMP4_DC_VLC_BITS, 3);
}
if (level < 0) {
av_log(h->c.avctx, AV_LOG_ERROR, "illegal dc vlc\n");
*dir_ptr = 0;
return -1;
}
level-=256;
} else {
level = get_vlc2(&h->gb, ff_msmp4_dc_vlc[ms->dc_table_index][n >= 4],
MSMP4_DC_VLC_BITS, 3);
if (level == DC_MAX) {
level = get_bits(&h->gb, 8);
if (get_bits1(&h->gb))
level = -level;
} else if (level != 0) {
if (get_bits1(&h->gb))
level = -level;
}
}
if (h->c.msmpeg4_version == MSMP4_V1) {
int32_t *dc_val;
pred = msmpeg4v1_pred_dc(&h->c, n, &dc_val);
level += pred;
/* update predictor */
*dc_val= level;
}else{
int16_t *dc_val;
pred = ff_msmpeg4_pred_dc(&h->c, n, &dc_val, dir_ptr);
level += pred;
/* update predictor */
if (n < 4) {
*dc_val = level * h->c.y_dc_scale;
} else {
*dc_val = level * h->c.c_dc_scale;
}
}
return level;
}
int ff_msmpeg4_decode_block(MSMP4DecContext *const ms, int16_t * block,
int n, int coded, const uint8_t *scan_table)
{
H263DecContext *const h = &ms->h;
int level, i, last, run, run_diff;
int dc_pred_dir = -1; //unused but its passed around, so it needs to be initialized
const RLTable *rl;
const RL_VLC_ELEM *rl_vlc;
int qmul, qadd;
if (h->c.mb_intra) {
qmul=1;
qadd=0;
/* DC coef */
level = msmpeg4_decode_dc(ms, n, &dc_pred_dir);
if (level < 0){
av_log(h->c.avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, h->c.qscale);
if (h->c.inter_intra_pred)
level = 0;
}
if (n < 4) {
rl = &ff_rl_table[ms->rl_table_index];
if (level > 256 * h->c.y_dc_scale) {
av_log(h->c.avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", h->c.qscale);
if (!h->c.inter_intra_pred)
return -1;
}
} else {
rl = &ff_rl_table[3 + ms->rl_chroma_table_index];
if (level > 256 * h->c.c_dc_scale) {
av_log(h->c.avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", h->c.qscale);
if (!h->c.inter_intra_pred)
return -1;
}
}
block[0] = level;
run_diff = h->c.msmpeg4_version >= MSMP4_WMV1;
i = 0;
if (!coded) {
goto not_coded;
}
if (h->c.ac_pred) {
if (dc_pred_dir == 0)
scan_table = h->c.permutated_intra_v_scantable; /* left */
else
scan_table = h->c.permutated_intra_h_scantable; /* top */
} else {
scan_table = h->c.intra_scantable.permutated;
}
rl_vlc= rl->rl_vlc[0];
} else {
qmul = h->c.qscale << 1;
qadd = (h->c.qscale - 1) | 1;
i = -1;
rl = &ff_rl_table[3 + ms->rl_table_index];
if (h->c.msmpeg4_version == MSMP4_V2)
run_diff = 0;
else
run_diff = 1;
if (!coded) {
h->c.block_last_index[n] = i;
return 0;
}
if(!scan_table)
scan_table = h->c.inter_scantable.permutated;
rl_vlc= rl->rl_vlc[h->c.qscale];
}
{
OPEN_READER(re, &h->gb);
for(;;) {
UPDATE_CACHE(re, &h->gb);
GET_RL_VLC(level, run, re, &h->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
if (level==0) {
int cache;
cache= GET_CACHE(re, &h->gb);
/* escape */
if (h->c.msmpeg4_version == MSMP4_V1 || (cache&0x80000000)==0) {
if (h->c.msmpeg4_version == MSMP4_V1 || (cache&0x40000000)==0) {
/* third escape */
if (h->c.msmpeg4_version != MSMP4_V1)
LAST_SKIP_BITS(re, &h->gb, 2);
UPDATE_CACHE(re, &h->gb);
if (h->c.msmpeg4_version <= MSMP4_V3) {
last = SHOW_UBITS(re, &h->gb, 1); SKIP_CACHE(re, &h->gb, 1);
run = SHOW_UBITS(re, &h->gb, 6); SKIP_CACHE(re, &h->gb, 6);
level = SHOW_SBITS(re, &h->gb, 8);
SKIP_COUNTER(re, &h->gb, 1 + 6 + 8);
}else{
int sign;
last = SHOW_UBITS(re, &h->gb, 1); SKIP_BITS(re, &h->gb, 1);
if (!ms->esc3_level_length) {
int ll;
ff_dlog(h->c.avctx, "ESC-3 %X at %d %d\n",
show_bits(&h->gb, 24), h->c.mb_x, h->c.mb_y);
if (h->c.qscale < 8) {
ll = SHOW_UBITS(re, &h->gb, 3); SKIP_BITS(re, &h->gb, 3);
if(ll==0){
ll = 8+SHOW_UBITS(re, &h->gb, 1); SKIP_BITS(re, &h->gb, 1);
}
}else{
ll=2;
while (ll < 8 && SHOW_UBITS(re, &h->gb, 1) == 0) {
ll++;
SKIP_BITS(re, &h->gb, 1);
}
if (ll<8) SKIP_BITS(re, &h->gb, 1);
}
ms->esc3_level_length = ll;
ms->esc3_run_length = SHOW_UBITS(re, &h->gb, 2) + 3; SKIP_BITS(re, &h->gb, 2);
UPDATE_CACHE(re, &h->gb);
}
run = SHOW_UBITS(re, &h->gb, ms->esc3_run_length);
SKIP_BITS(re, &h->gb, ms->esc3_run_length);
sign= SHOW_UBITS(re, &h->gb, 1);
SKIP_BITS(re, &h->gb, 1);
level = SHOW_UBITS(re, &h->gb, ms->esc3_level_length);
SKIP_BITS(re, &h->gb, ms->esc3_level_length);
if(sign) level= -level;
}
//level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
if (level>0) level= level * qmul + qadd;
else level= level * qmul - qadd;
i+= run + 1;
if(last) i+=192;
} else {
/* second escape */
SKIP_BITS(re, &h->gb, 2);
GET_RL_VLC(level, run, re, &h->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &h->gb, 1)) - SHOW_SBITS(re, &h->gb, 1);
LAST_SKIP_BITS(re, &h->gb, 1);
}
} else {
/* first escape */
SKIP_BITS(re, &h->gb, 1);
GET_RL_VLC(level, run, re, &h->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
i+= run;
level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
level = (level ^ SHOW_SBITS(re, &h->gb, 1)) - SHOW_SBITS(re, &h->gb, 1);
LAST_SKIP_BITS(re, &h->gb, 1);
}
} else {
i+= run;
level = (level ^ SHOW_SBITS(re, &h->gb, 1)) - SHOW_SBITS(re, &h->gb, 1);
LAST_SKIP_BITS(re, &h->gb, 1);
}
if (i > 62){
i-= 192;
if(i&(~63)){
const int left = get_bits_left(&h->gb);
if (((i + 192 == 64 && level / qmul == -1) ||
!(h->c.avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
left >= 0) {
av_log(h->c.avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n",
h->c.mb_x, h->c.mb_y);
i = 63;
break;
}else{
av_log(h->c.avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n",
h->c.mb_x, h->c.mb_y);
return -1;
}
}
block[scan_table[i]] = level;
break;
}
block[scan_table[i]] = level;
}
CLOSE_READER(re, &h->gb);
}
if (h->c.mb_intra) {
not_coded:
ff_mpeg4_pred_ac(h, block, n, dc_pred_dir);
}
h->c.block_last_index[n] = i;
return 0;
}
void ff_msmpeg4_decode_motion(MSMP4DecContext *const ms, int *mx_ptr, int *my_ptr)
{
const VLCElem *const mv_vlc = mv_tables[ms->mv_table_index];
H263DecContext *const h = &ms->h;
int sym, mx, my;
sym = get_vlc2(&h->gb, mv_vlc, MV_VLC_BITS, 2);
if (sym) {
mx = sym >> 8;
my = sym & 0xFF;
} else {
/* Escape */
mx = get_bits(&h->gb, 6);
my = get_bits(&h->gb, 6);
}
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;
}
av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
{
static AVOnce init_static_once = AV_ONCE_INIT;
H263DecContext *const h = avctx->priv_data;
int ret;
ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
if (ret < 0)
return ret;
if (ff_h263_decode_init(avctx) < 0)
return -1;
// We unquantize inter blocks as we parse them.
h->c.dct_unquantize_inter = NULL;
h->decode_header = msmpeg4_decode_picture_header;
ff_msmpeg4_common_init(&h->c);
switch (h->c.msmpeg4_version) {
case MSMP4_V1:
case MSMP4_V2:
h->decode_mb = msmpeg4v12_decode_mb;
break;
case MSMP4_V3:
case MSMP4_WMV1:
h->decode_mb = msmpeg4v34_decode_mb;
break;
case MSMP4_WMV2:
break;
default:
av_unreachable("List contains all cases using ff_msmpeg4_decode_init()");
}
h->slice_height = h->c.mb_height; //to avoid 1/0 if the first frame is not a keyframe
ff_thread_once(&init_static_once, msmpeg4_decode_init_static);
return 0;
}
const FFCodec ff_msmpeg4v1_decoder = {
.p.name = "msmpeg4v1",
CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 1"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSMPEG4V1,
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.p.max_lowres = 3,
};
const FFCodec ff_msmpeg4v2_decoder = {
.p.name = "msmpeg4v2",
CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 2"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSMPEG4V2,
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.p.max_lowres = 3,
};
const FFCodec ff_msmpeg4v3_decoder = {
.p.name = "msmpeg4",
CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 3"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_MSMPEG4V3,
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.p.max_lowres = 3,
};
const FFCodec ff_wmv1_decoder = {
.p.name = "wmv1",
CODEC_LONG_NAME("Windows Media Video 7"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_WMV1,
.priv_data_size = sizeof(MSMP4DecContext),
.init = ff_msmpeg4_decode_init,
FF_CODEC_DECODE_CB(ff_h263_decode_frame),
.close = ff_mpv_decode_close,
.p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
.p.max_lowres = 3,
};
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