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ffmpeg/libavcodec/vc1.c
Andreas Rheinhardt fe6037fd04 avcodec/mpegpicture: Split MPVPicture into WorkPicture and ordinary Pic 
There are two types of MPVPictures: Three (cur_pic, last_pic, next_pic)
that are directly part of MpegEncContext and an array of MPVPictures
that are separately allocated and are mostly accessed via pointers
(cur|last|next)_pic_ptr; they are also used to store AVFrames in the
encoder (necessary due to B-frames). As the name implies, each of the
former is directly associated with one of the _ptr pointers:
They actually share the same underlying buffers, but the ones
that are part of the context can have their data pointers offset
and their linesize doubled for field pictures.

Up until now, each of these had their own references; in particular,
there was an underlying av_frame_ref() to sync cur_pic and cur_pic_ptr
etc. This is wasteful.

This commit changes this relationship: cur_pic, last_pic and next_pic
now become MPVWorkPictures; this structure does not have an AVFrame
at all any more, but only the cached values of data and linesize.
It also contains a pointer to the corresponding MPVPicture, establishing
a more natural relationsship between the two.
This already means that creating the context-pictures from the pointers
can no longer fail.

What has not been changed is the fact that the MPVPicture* pointers
are not ownership pointers and that the MPVPictures are part of an
array of MPVPictures that is owned by a single AVCodecContext.
Doing so will be done in a latter commit.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-06-12 11:38:13 +02:00

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/*
* VC-1 and WMV3 decoder common code
* Copyright (c) 2011 Mashiat Sarker Shakkhar
* Copyright (c) 2006-2007 Konstantin Shishkov
* Partly based on vc9.c (c) 2005 Anonymous, Alex Beregszaszi, Michael Niedermayer
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* VC-1 and WMV3 decoder common code
*/
#include "avcodec.h"
#include "decode.h"
#include "mpegvideo.h"
#include "vc1.h"
#include "vc1data.h"
#include "wmv2data.h"
#include "unary.h"
/***********************************************************************/
/**
* @name VC-1 Bitplane decoding
* @see 8.7, p56
* @{
*/
/** Decode rows by checking if they are skipped
* @param plane Buffer to store decoded bits
* @param[in] width Width of this buffer
* @param[in] height Height of this buffer
* @param[in] stride of this buffer
*/
static void decode_rowskip(uint8_t* plane, int width, int height, int stride,
GetBitContext *gb)
{
int x, y;
for (y = 0; y < height; y++) {
if (!get_bits1(gb)) //rowskip
memset(plane, 0, width);
else
for (x = 0; x < width; x++)
plane[x] = get_bits1(gb);
plane += stride;
}
}
/** Decode columns by checking if they are skipped
* @param plane Buffer to store decoded bits
* @param[in] width Width of this buffer
* @param[in] height Height of this buffer
* @param[in] stride of this buffer
* @todo FIXME: Optimize
*/
static void decode_colskip(uint8_t* plane, int width, int height, int stride,
GetBitContext *gb)
{
int x, y;
for (x = 0; x < width; x++) {
if (!get_bits1(gb)) //colskip
for (y = 0; y < height; y++)
plane[y*stride] = 0;
else
for (y = 0; y < height; y++)
plane[y*stride] = get_bits1(gb);
plane ++;
}
}
/** Decode a bitplane's bits
* @param data bitplane where to store the decode bits
* @param[out] raw_flag pointer to the flag indicating that this bitplane is not coded explicitly
* @param v VC-1 context for bit reading and logging
* @return Status
* @todo FIXME: Optimize
*/
static int bitplane_decoding(uint8_t* data, int *raw_flag, VC1Context *v)
{
GetBitContext *gb = &v->s.gb;
int imode, x, y, code, offset;
uint8_t invert, *planep = data;
int width, height, stride;
width = v->s.mb_width;
height = v->s.mb_height >> v->field_mode;
stride = v->s.mb_stride;
invert = get_bits1(gb);
imode = get_vlc2(gb, ff_vc1_imode_vlc, VC1_IMODE_VLC_BITS, 1);
*raw_flag = 0;
switch (imode) {
case IMODE_RAW:
//Data is actually read in the MB layer (same for all tests == "raw")
*raw_flag = 1; //invert ignored
return invert;
case IMODE_DIFF2:
case IMODE_NORM2:
if ((height * width) & 1) {
*planep++ = get_bits1(gb);
y = offset = 1;
if (offset == width) {
offset = 0;
planep += stride - width;
}
}
else
y = offset = 0;
// decode bitplane as one long line
for (; y < height * width; y += 2) {
code = get_vlc2(gb, ff_vc1_norm2_vlc, VC1_NORM2_VLC_BITS, 1);
*planep++ = code & 1;
offset++;
if (offset == width) {
offset = 0;
planep += stride - width;
}
*planep++ = code >> 1;
offset++;
if (offset == width) {
offset = 0;
planep += stride - width;
}
}
break;
case IMODE_DIFF6:
case IMODE_NORM6:
if (!(height % 3) && (width % 3)) { // use 2x3 decoding
for (y = 0; y < height; y += 3) {
for (x = width & 1; x < width; x += 2) {
code = get_vlc2(gb, ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 2);
if (code < 0) {
av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");
return -1;
}
planep[x + 0] = (code >> 0) & 1;
planep[x + 1] = (code >> 1) & 1;
planep[x + 0 + stride] = (code >> 2) & 1;
planep[x + 1 + stride] = (code >> 3) & 1;
planep[x + 0 + stride * 2] = (code >> 4) & 1;
planep[x + 1 + stride * 2] = (code >> 5) & 1;
}
planep += stride * 3;
}
if (width & 1)
decode_colskip(data, 1, height, stride, &v->s.gb);
} else { // 3x2
planep += (height & 1) * stride;
for (y = height & 1; y < height; y += 2) {
for (x = width % 3; x < width; x += 3) {
code = get_vlc2(gb, ff_vc1_norm6_vlc, VC1_NORM6_VLC_BITS, 2);
if (code < 0) {
av_log(v->s.avctx, AV_LOG_DEBUG, "invalid NORM-6 VLC\n");
return -1;
}
planep[x + 0] = (code >> 0) & 1;
planep[x + 1] = (code >> 1) & 1;
planep[x + 2] = (code >> 2) & 1;
planep[x + 0 + stride] = (code >> 3) & 1;
planep[x + 1 + stride] = (code >> 4) & 1;
planep[x + 2 + stride] = (code >> 5) & 1;
}
planep += stride * 2;
}
x = width % 3;
if (x)
decode_colskip(data, x, height, stride, &v->s.gb);
if (height & 1)
decode_rowskip(data + x, width - x, 1, stride, &v->s.gb);
}
break;
case IMODE_ROWSKIP:
decode_rowskip(data, width, height, stride, &v->s.gb);
break;
case IMODE_COLSKIP:
decode_colskip(data, width, height, stride, &v->s.gb);
break;
default:
break;
}
/* Applying diff operator */
if (imode == IMODE_DIFF2 || imode == IMODE_DIFF6) {
planep = data;
planep[0] ^= invert;
for (x = 1; x < width; x++)
planep[x] ^= planep[x-1];
for (y = 1; y < height; y++) {
planep += stride;
planep[0] ^= planep[-stride];
for (x = 1; x < width; x++) {
if (planep[x-1] != planep[x-stride]) planep[x] ^= invert;
else planep[x] ^= planep[x-1];
}
}
} else if (invert) {
planep = data;
for (x = 0; x < stride * height; x++)
planep[x] = !planep[x]; //FIXME stride
}
return (imode << 1) + invert;
}
/** @} */ //Bitplane group
/***********************************************************************/
/** VOP Dquant decoding
* @param v VC-1 Context
*/
static int vop_dquant_decoding(VC1Context *v)
{
GetBitContext *gb = &v->s.gb;
int pqdiff;
//variable size
if (v->dquant != 2) {
v->dquantfrm = get_bits1(gb);
if (!v->dquantfrm)
return 0;
v->dqprofile = get_bits(gb, 2);
switch (v->dqprofile) {
case DQPROFILE_SINGLE_EDGE:
case DQPROFILE_DOUBLE_EDGES:
v->dqsbedge = get_bits(gb, 2);
break;
case DQPROFILE_ALL_MBS:
v->dqbilevel = get_bits1(gb);
if (!v->dqbilevel) {
v->halfpq = 0;
return 0;
}
default:
break; //Forbidden ?
}
}
pqdiff = get_bits(gb, 3);
if (pqdiff == 7)
v->altpq = get_bits(gb, 5);
else
v->altpq = v->pq + pqdiff + 1;
return 0;
}
static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb);
/**
* Decode Simple/Main Profiles sequence header
* @see Figure 7-8, p16-17
* @param avctx Codec context
* @param gb GetBit context initialized from Codec context extra_data
* @return Status
*/
int ff_vc1_decode_sequence_header(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
{
av_log(avctx, AV_LOG_DEBUG, "Header: %0X\n", show_bits_long(gb, 32));
v->profile = get_bits(gb, 2);
if (v->profile == PROFILE_COMPLEX) {
av_log(avctx, AV_LOG_WARNING, "WMV3 Complex Profile is not fully supported\n");
}
if (v->profile == PROFILE_ADVANCED) {
v->zz_8x4 = ff_vc1_adv_progressive_8x4_zz;
v->zz_4x8 = ff_vc1_adv_progressive_4x8_zz;
return decode_sequence_header_adv(v, gb);
} else {
v->chromaformat = 1;
v->zz_8x4 = ff_wmv2_scantableA;
v->zz_4x8 = ff_wmv2_scantableB;
v->res_y411 = get_bits1(gb);
v->res_sprite = get_bits1(gb);
if (v->res_y411) {
av_log(avctx, AV_LOG_ERROR,
"Old interlaced mode is not supported\n");
return -1;
}
}
// (fps-2)/4 (->30)
v->frmrtq_postproc = get_bits(gb, 3); //common
// (bitrate-32kbps)/64kbps
v->bitrtq_postproc = get_bits(gb, 5); //common
v->s.loop_filter = get_bits1(gb); //common
if (v->s.loop_filter == 1 && v->profile == PROFILE_SIMPLE) {
av_log(avctx, AV_LOG_ERROR,
"LOOPFILTER shall not be enabled in Simple Profile\n");
}
if (v->s.avctx->skip_loop_filter >= AVDISCARD_ALL)
v->s.loop_filter = 0;
v->res_x8 = get_bits1(gb); //reserved
v->multires = get_bits1(gb);
v->res_fasttx = get_bits1(gb);
v->fastuvmc = get_bits1(gb); //common
if (!v->profile && !v->fastuvmc) {
av_log(avctx, AV_LOG_ERROR,
"FASTUVMC unavailable in Simple Profile\n");
return -1;
}
v->extended_mv = get_bits1(gb); //common
if (!v->profile && v->extended_mv) {
av_log(avctx, AV_LOG_ERROR,
"Extended MVs unavailable in Simple Profile\n");
return -1;
}
v->dquant = get_bits(gb, 2); //common
v->vstransform = get_bits1(gb); //common
v->res_transtab = get_bits1(gb);
if (v->res_transtab) {
av_log(avctx, AV_LOG_ERROR,
"1 for reserved RES_TRANSTAB is forbidden\n");
return -1;
}
v->overlap = get_bits1(gb); //common
v->resync_marker = get_bits1(gb);
v->rangered = get_bits1(gb);
if (v->rangered && v->profile == PROFILE_SIMPLE) {
av_log(avctx, AV_LOG_INFO,
"RANGERED should be set to 0 in Simple Profile\n");
}
v->s.max_b_frames = avctx->max_b_frames = get_bits(gb, 3); //common
v->quantizer_mode = get_bits(gb, 2); //common
v->finterpflag = get_bits1(gb); //common
if (v->res_sprite) {
int w = get_bits(gb, 11);
int h = get_bits(gb, 11);
int ret = ff_set_dimensions(v->s.avctx, w, h);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to set dimensions %d %d\n", w, h);
return ret;
}
skip_bits(gb, 5); //frame rate
v->res_x8 = get_bits1(gb);
if (get_bits1(gb)) { // something to do with DC VLC selection
av_log(avctx, AV_LOG_ERROR, "Unsupported sprite feature\n");
return -1;
}
skip_bits(gb, 3); //slice code
v->res_rtm_flag = 0;
} else {
v->res_rtm_flag = get_bits1(gb); //reserved
}
//TODO: figure out what they mean (always 0x402F)
if (!v->res_fasttx)
skip_bits(gb, 16);
av_log(avctx, AV_LOG_DEBUG,
"Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
"LoopFilter=%i, MultiRes=%i, FastUVMC=%i, Extended MV=%i\n"
"Rangered=%i, VSTransform=%i, Overlap=%i, SyncMarker=%i\n"
"DQuant=%i, Quantizer mode=%i, Max B-frames=%i\n",
v->profile, v->frmrtq_postproc, v->bitrtq_postproc,
v->s.loop_filter, v->multires, v->fastuvmc, v->extended_mv,
v->rangered, v->vstransform, v->overlap, v->resync_marker,
v->dquant, v->quantizer_mode, avctx->max_b_frames);
return 0;
}
static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
{
v->res_rtm_flag = 1;
v->level = get_bits(gb, 3);
if (v->level >= 5) {
av_log(v->s.avctx, AV_LOG_ERROR, "Reserved LEVEL %i\n",v->level);
}
v->chromaformat = get_bits(gb, 2);
if (v->chromaformat != 1) {
av_log(v->s.avctx, AV_LOG_ERROR,
"Only 4:2:0 chroma format supported\n");
return -1;
}
// (fps-2)/4 (->30)
v->frmrtq_postproc = get_bits(gb, 3); //common
// (bitrate-32kbps)/64kbps
v->bitrtq_postproc = get_bits(gb, 5); //common
v->postprocflag = get_bits1(gb); //common
v->max_coded_width = (get_bits(gb, 12) + 1) << 1;
v->max_coded_height = (get_bits(gb, 12) + 1) << 1;
v->broadcast = get_bits1(gb);
v->interlace = get_bits1(gb);
v->tfcntrflag = get_bits1(gb);
v->finterpflag = get_bits1(gb);
skip_bits1(gb); // reserved
av_log(v->s.avctx, AV_LOG_DEBUG,
"Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
"LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"
"TFCTRflag=%i, FINTERPflag=%i\n",
v->level, v->frmrtq_postproc, v->bitrtq_postproc,
v->s.loop_filter, v->chromaformat, v->broadcast, v->interlace,
v->tfcntrflag, v->finterpflag);
#if FF_API_TICKS_PER_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
if (v->broadcast) { // Pulldown may be present
v->s.avctx->ticks_per_frame = 2;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
v->psf = get_bits1(gb);
if (v->psf) { //PsF, 6.1.13
av_log(v->s.avctx, AV_LOG_ERROR, "Progressive Segmented Frame mode: not supported (yet)\n");
return -1;
}
v->s.max_b_frames = v->s.avctx->max_b_frames = 7;
if (get_bits1(gb)) { //Display Info - decoding is not affected by it
int w, h, ar = 0;
av_log(v->s.avctx, AV_LOG_DEBUG, "Display extended info:\n");
w = get_bits(gb, 14) + 1;
h = get_bits(gb, 14) + 1;
av_log(v->s.avctx, AV_LOG_DEBUG, "Display dimensions: %ix%i\n", w, h);
if (get_bits1(gb))
ar = get_bits(gb, 4);
if (ar && ar < 14) {
v->s.avctx->sample_aspect_ratio = ff_vc1_pixel_aspect[ar];
} else if (ar == 15) {
w = get_bits(gb, 8) + 1;
h = get_bits(gb, 8) + 1;
v->s.avctx->sample_aspect_ratio = (AVRational){w, h};
} else {
if (v->s.avctx->width > v->max_coded_width ||
v->s.avctx->height > v->max_coded_height) {
avpriv_request_sample(v->s.avctx, "Huge resolution");
} else
av_reduce(&v->s.avctx->sample_aspect_ratio.num,
&v->s.avctx->sample_aspect_ratio.den,
v->s.avctx->height * w,
v->s.avctx->width * h,
1 << 30);
}
ff_set_sar(v->s.avctx, v->s.avctx->sample_aspect_ratio);
av_log(v->s.avctx, AV_LOG_DEBUG, "Aspect: %i:%i\n",
v->s.avctx->sample_aspect_ratio.num,
v->s.avctx->sample_aspect_ratio.den);
if (get_bits1(gb)) { //framerate stuff
if (get_bits1(gb)) {
v->s.avctx->framerate.den = 32;
v->s.avctx->framerate.num = get_bits(gb, 16) + 1;
} else {
int nr, dr;
nr = get_bits(gb, 8);
dr = get_bits(gb, 4);
if (nr > 0 && nr < 8 && dr > 0 && dr < 3) {
v->s.avctx->framerate.den = ff_vc1_fps_dr[dr - 1];
v->s.avctx->framerate.num = ff_vc1_fps_nr[nr - 1] * 1000;
}
}
}
if (get_bits1(gb)) {
v->color_prim = get_bits(gb, 8);
v->transfer_char = get_bits(gb, 8);
v->matrix_coef = get_bits(gb, 8);
}
}
v->hrd_param_flag = get_bits1(gb);
if (v->hrd_param_flag) {
int i;
v->hrd_num_leaky_buckets = get_bits(gb, 5);
skip_bits(gb, 4); //bitrate exponent
skip_bits(gb, 4); //buffer size exponent
for (i = 0; i < v->hrd_num_leaky_buckets; i++) {
skip_bits(gb, 16); //hrd_rate[n]
skip_bits(gb, 16); //hrd_buffer[n]
}
}
return 0;
}
int ff_vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *gb)
{
int i;
int w,h;
int ret;
av_log(avctx, AV_LOG_DEBUG, "Entry point: %08X\n", show_bits_long(gb, 32));
v->broken_link = get_bits1(gb);
v->closed_entry = get_bits1(gb);
v->panscanflag = get_bits1(gb);
v->refdist_flag = get_bits1(gb);
v->s.loop_filter = get_bits1(gb);
if (v->s.avctx->skip_loop_filter >= AVDISCARD_ALL)
v->s.loop_filter = 0;
v->fastuvmc = get_bits1(gb);
v->extended_mv = get_bits1(gb);
v->dquant = get_bits(gb, 2);
v->vstransform = get_bits1(gb);
v->overlap = get_bits1(gb);
v->quantizer_mode = get_bits(gb, 2);
if (v->hrd_param_flag) {
for (i = 0; i < v->hrd_num_leaky_buckets; i++) {
skip_bits(gb, 8); //hrd_full[n]
}
}
if(get_bits1(gb)){
w = (get_bits(gb, 12)+1)<<1;
h = (get_bits(gb, 12)+1)<<1;
} else {
w = v->max_coded_width;
h = v->max_coded_height;
}
if ((ret = ff_set_dimensions(avctx, w, h)) < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to set dimensions %d %d\n", w, h);
return ret;
}
if (v->extended_mv)
v->extended_dmv = get_bits1(gb);
if ((v->range_mapy_flag = get_bits1(gb))) {
av_log(avctx, AV_LOG_ERROR, "Luma scaling is not supported, expect wrong picture\n");
v->range_mapy = get_bits(gb, 3);
}
if ((v->range_mapuv_flag = get_bits1(gb))) {
av_log(avctx, AV_LOG_ERROR, "Chroma scaling is not supported, expect wrong picture\n");
v->range_mapuv = get_bits(gb, 3);
}
av_log(avctx, AV_LOG_DEBUG, "Entry point info:\n"
"BrokenLink=%i, ClosedEntry=%i, PanscanFlag=%i\n"
"RefDist=%i, Postproc=%i, FastUVMC=%i, ExtMV=%i\n"
"DQuant=%i, VSTransform=%i, Overlap=%i, Qmode=%i\n",
v->broken_link, v->closed_entry, v->panscanflag, v->refdist_flag, v->s.loop_filter,
v->fastuvmc, v->extended_mv, v->dquant, v->vstransform, v->overlap, v->quantizer_mode);
return 0;
}
/* fill lookup tables for intensity compensation */
#define INIT_LUT(lumscale, lumshift, luty, lutuv, chain) do { \
int scale, shift, i; \
if (!lumscale) { \
scale = -64; \
shift = (255 - lumshift * 2) * 64; \
if (lumshift > 31) \
shift += 128 << 6; \
} else { \
scale = lumscale + 32; \
if (lumshift > 31) \
shift = (lumshift - 64) * 64; \
else \
shift = lumshift << 6; \
} \
for (i = 0; i < 256; i++) { \
int iy = chain ? luty[i] : i; \
int iu = chain ? lutuv[i] : i; \
luty[i] = av_clip_uint8((scale * iy + shift + 32) >> 6); \
lutuv[i] = av_clip_uint8((scale * (iu - 128) + 128*64 + 32) >> 6);\
} \
} while(0)
static void rotate_luts(VC1Context *v)
{
#define ROTATE(DEF, L, N, C, A) do { \
if (v->s.pict_type == AV_PICTURE_TYPE_BI || v->s.pict_type == AV_PICTURE_TYPE_B) { \
C = A; \
} else { \
DEF; \
memcpy(&tmp, L , sizeof(tmp)); \
memcpy(L , N , sizeof(tmp)); \
memcpy(N , &tmp, sizeof(tmp)); \
C = N; \
} \
} while(0)
ROTATE(int tmp, &v->last_use_ic, &v->next_use_ic, v->curr_use_ic, &v->aux_use_ic);
ROTATE(uint8_t tmp[2][256], v->last_luty, v->next_luty, v->curr_luty, v->aux_luty);
ROTATE(uint8_t tmp[2][256], v->last_lutuv, v->next_lutuv, v->curr_lutuv, v->aux_lutuv);
INIT_LUT(32, 0, v->curr_luty[0], v->curr_lutuv[0], 0);
INIT_LUT(32, 0, v->curr_luty[1], v->curr_lutuv[1], 0);
*v->curr_use_ic = 0;
}
static int read_bfraction(VC1Context *v, GetBitContext* gb) {
int bfraction_lut_index = get_bits(gb, 3);
if (bfraction_lut_index == 7)
bfraction_lut_index = 7 + get_bits(gb, 4);
if (bfraction_lut_index == 21) {
av_log(v->s.avctx, AV_LOG_ERROR, "bfraction invalid\n");
return AVERROR_INVALIDDATA;
}
v->bfraction_lut_index = bfraction_lut_index;
v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];
return 0;
}
int ff_vc1_parse_frame_header(VC1Context *v, GetBitContext* gb)
{
int pqindex, lowquant, status;
v->field_mode = 0;
v->fcm = PROGRESSIVE;
if (v->finterpflag)
v->interpfrm = get_bits1(gb);
if (v->s.avctx->codec_id == AV_CODEC_ID_MSS2)
v->respic =
v->rangered =
v->multires = get_bits(gb, 2) == 1;
else
skip_bits(gb, 2); //framecnt unused
v->rangeredfrm = 0;
if (v->rangered)
v->rangeredfrm = get_bits1(gb);
if (get_bits1(gb)) {
v->s.pict_type = AV_PICTURE_TYPE_P;
} else {
if (v->s.avctx->max_b_frames && !get_bits1(gb)) {
v->s.pict_type = AV_PICTURE_TYPE_B;
} else
v->s.pict_type = AV_PICTURE_TYPE_I;
}
v->bi_type = 0;
if (v->s.pict_type == AV_PICTURE_TYPE_B) {
if (read_bfraction(v, gb) < 0)
return AVERROR_INVALIDDATA;
if (v->bfraction == 0) {
v->s.pict_type = AV_PICTURE_TYPE_BI;
}
}
if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI)
skip_bits(gb, 7); // skip buffer fullness
if (v->parse_only)
return 0;
/* calculate RND */
if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI)
v->rnd = 1;
if (v->s.pict_type == AV_PICTURE_TYPE_P)
v->rnd ^= 1;
if (get_bits_left(gb) < 5)
return AVERROR_INVALIDDATA;
/* Quantizer stuff */
pqindex = get_bits(gb, 5);
if (!pqindex)
return -1;
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pq = ff_vc1_pquant_table[0][pqindex];
else
v->pq = ff_vc1_pquant_table[1][pqindex];
v->pqindex = pqindex;
if (pqindex < 9)
v->halfpq = get_bits1(gb);
else
v->halfpq = 0;
switch (v->quantizer_mode) {
case QUANT_FRAME_IMPLICIT:
v->pquantizer = pqindex < 9;
break;
case QUANT_NON_UNIFORM:
v->pquantizer = 0;
break;
case QUANT_FRAME_EXPLICIT:
v->pquantizer = get_bits1(gb);
break;
default:
v->pquantizer = 1;
break;
}
v->dquantfrm = 0;
if (v->extended_mv == 1)
v->mvrange = get_unary(gb, 0, 3);
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
v->range_x = 1 << (v->k_x - 1);
v->range_y = 1 << (v->k_y - 1);
if (v->multires && v->s.pict_type != AV_PICTURE_TYPE_B)
v->respic = get_bits(gb, 2);
if (v->res_x8 && (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI)) {
v->x8_type = get_bits1(gb);
} else
v->x8_type = 0;
ff_dlog(v->s.avctx, "%c Frame: QP=[%i]%i (+%i/2) %i\n",
(v->s.pict_type == AV_PICTURE_TYPE_P) ? 'P' : ((v->s.pict_type == AV_PICTURE_TYPE_I) ? 'I' : 'B'),
pqindex, v->pq, v->halfpq, v->rangeredfrm);
if (v->first_pic_header_flag)
rotate_luts(v);
switch (v->s.pict_type) {
case AV_PICTURE_TYPE_P:
v->tt_index = (v->pq > 4) + (v->pq > 12);
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][get_unary(gb, 1, 4)];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][get_unary(gb, 1, 3)];
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
v->last_use_ic = 1;
/* fill lookup tables for intensity compensation */
INIT_LUT(v->lumscale, v->lumshift, v->last_luty[0], v->last_lutuv[0], 1);
INIT_LUT(v->lumscale, v->lumshift, v->last_luty[1], v->last_lutuv[1], 1);
}
v->qs_last = v->s.quarter_sample;
if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
v->s.quarter_sample = (v->mv_mode2 != MV_PMODE_1MV_HPEL &&
v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
} else {
v->s.quarter_sample = (v->mv_mode != MV_PMODE_1MV_HPEL &&
v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
}
if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
v->mv_mode2 == MV_PMODE_MIXED_MV) ||
v->mv_mode == MV_PMODE_MIXED_MV) {
status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
} else {
v->mv_type_is_raw = 0;
memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);
}
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
if (get_bits_left(gb) < 4)
return AVERROR_INVALIDDATA;
/* Hopefully this is correct for P-frames */
v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables
v->cbptab = get_bits(gb, 2);
v->cbpcy_vlc = ff_vc1_cbpcy_p_vlc[v->cbptab];
if (v->dquant) {
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
vop_dquant_decoding(v);
}
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
} else
v->ttfrm = 0; //FIXME Is that so ?
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
case AV_PICTURE_TYPE_B:
v->tt_index = (v->pq > 4) + (v->pq > 12);
v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
v->qs_last = v->s.quarter_sample;
v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);
v->s.mspel = v->s.quarter_sample;
status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->s.mv_table_index = get_bits(gb, 2);
v->cbptab = get_bits(gb, 2);
v->cbpcy_vlc = ff_vc1_cbpcy_p_vlc[v->cbptab];
if (v->dquant) {
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
vop_dquant_decoding(v);
}
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
} else
v->ttfrm = 0;
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
}
if (!v->x8_type) {
/* AC Syntax */
v->c_ac_table_index = decode012(gb);
if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI) {
v->y_ac_table_index = decode012(gb);
}
/* DC Syntax */
v->s.dc_table_index = get_bits1(gb);
}
if (v->s.pict_type == AV_PICTURE_TYPE_BI) {
v->s.pict_type = AV_PICTURE_TYPE_B;
v->bi_type = 1;
}
return 0;
}
int ff_vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
{
int pqindex, lowquant;
int status;
int field_mode, fcm;
v->numref = 0;
v->p_frame_skipped = 0;
if (v->second_field) {
if (v->fcm != ILACE_FIELD || v->field_mode!=1)
return -1;
if (v->fptype & 4)
v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_BI : AV_PICTURE_TYPE_B;
else
v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
v->s.cur_pic.ptr->f->pict_type = v->s.pict_type;
if (!v->pic_header_flag)
goto parse_common_info;
}
field_mode = 0;
if (v->interlace) {
fcm = decode012(gb);
if (fcm) {
if (fcm == ILACE_FIELD)
field_mode = 1;
}
} else {
fcm = PROGRESSIVE;
}
if (!v->first_pic_header_flag && v->field_mode != field_mode)
return AVERROR_INVALIDDATA;
v->field_mode = field_mode;
v->fcm = fcm;
av_assert0( v->s.mb_height == v->s.height + 15 >> 4
|| v->s.mb_height == FFALIGN(v->s.height + 15 >> 4, 2));
if (v->field_mode) {
v->s.mb_height = FFALIGN(v->s.height + 15 >> 4, 2);
v->fptype = get_bits(gb, 3);
if (v->fptype & 4) // B-picture
v->s.pict_type = (v->fptype & 2) ? AV_PICTURE_TYPE_BI : AV_PICTURE_TYPE_B;
else
v->s.pict_type = (v->fptype & 2) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
} else {
v->s.mb_height = v->s.height + 15 >> 4;
switch (get_unary(gb, 0, 4)) {
case 0:
v->s.pict_type = AV_PICTURE_TYPE_P;
break;
case 1:
v->s.pict_type = AV_PICTURE_TYPE_B;
break;
case 2:
v->s.pict_type = AV_PICTURE_TYPE_I;
break;
case 3:
v->s.pict_type = AV_PICTURE_TYPE_BI;
break;
case 4:
v->s.pict_type = AV_PICTURE_TYPE_P; // skipped pic
v->p_frame_skipped = 1;
break;
}
}
if (v->tfcntrflag)
skip_bits(gb, 8);
if (v->broadcast) {
if (!v->interlace || v->psf) {
v->rptfrm = get_bits(gb, 2);
} else {
v->tff = get_bits1(gb);
v->rff = get_bits1(gb);
}
} else {
v->tff = 1;
}
if (v->panscanflag) {
avpriv_report_missing_feature(v->s.avctx, "Pan-scan");
//...
}
if (v->p_frame_skipped) {
return 0;
}
v->rnd = get_bits1(gb);
if (v->interlace)
v->uvsamp = get_bits1(gb);
if (v->field_mode) {
if (!v->refdist_flag)
v->refdist = 0;
else if ((v->s.pict_type != AV_PICTURE_TYPE_B) && (v->s.pict_type != AV_PICTURE_TYPE_BI)) {
v->refdist = get_bits(gb, 2);
if (v->refdist == 3)
v->refdist += get_unary(gb, 0, 14);
if (v->refdist > 16)
return AVERROR_INVALIDDATA;
}
if ((v->s.pict_type == AV_PICTURE_TYPE_B) || (v->s.pict_type == AV_PICTURE_TYPE_BI)) {
if (read_bfraction(v, gb) < 0)
return AVERROR_INVALIDDATA;
v->frfd = (v->bfraction * v->refdist) >> 8;
v->brfd = v->refdist - v->frfd - 1;
if (v->brfd < 0)
v->brfd = 0;
}
goto parse_common_info;
}
if (v->fcm == PROGRESSIVE) {
if (v->finterpflag)
v->interpfrm = get_bits1(gb);
if (v->s.pict_type == AV_PICTURE_TYPE_B) {
if (read_bfraction(v, gb) < 0)
return AVERROR_INVALIDDATA;
if (v->bfraction == 0) {
v->s.pict_type = AV_PICTURE_TYPE_BI; /* XXX: should not happen here */
}
}
}
parse_common_info:
if (v->field_mode)
v->cur_field_type = !(v->tff ^ v->second_field);
pqindex = get_bits(gb, 5);
if (!pqindex)
return -1;
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pq = ff_vc1_pquant_table[0][pqindex];
else
v->pq = ff_vc1_pquant_table[1][pqindex];
v->pqindex = pqindex;
if (pqindex < 9)
v->halfpq = get_bits1(gb);
else
v->halfpq = 0;
switch (v->quantizer_mode) {
case QUANT_FRAME_IMPLICIT:
v->pquantizer = pqindex < 9;
break;
case QUANT_NON_UNIFORM:
v->pquantizer = 0;
break;
case QUANT_FRAME_EXPLICIT:
v->pquantizer = get_bits1(gb);
break;
default:
v->pquantizer = 1;
break;
}
v->dquantfrm = 0;
if (v->postprocflag)
v->postproc = get_bits(gb, 2);
if (v->parse_only)
return 0;
if (v->first_pic_header_flag)
rotate_luts(v);
switch (v->s.pict_type) {
case AV_PICTURE_TYPE_I:
case AV_PICTURE_TYPE_BI:
if (v->fcm == ILACE_FRAME) { //interlace frame picture
status = bitplane_decoding(v->fieldtx_plane, &v->fieldtx_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "FIELDTX plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
} else
v->fieldtx_is_raw = 0;
status = bitplane_decoding(v->acpred_plane, &v->acpred_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "ACPRED plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->condover = CONDOVER_NONE;
if (v->overlap && v->pq <= 8) {
v->condover = decode012(gb);
if (v->condover == CONDOVER_SELECT) {
status = bitplane_decoding(v->over_flags_plane, &v->overflg_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "CONDOVER plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
}
}
break;
case AV_PICTURE_TYPE_P:
if (v->field_mode) {
v->numref = get_bits1(gb);
if (!v->numref) {
v->reffield = get_bits1(gb);
v->ref_field_type[0] = v->reffield ^ !v->cur_field_type;
}
}
if (v->extended_mv)
v->mvrange = get_unary(gb, 0, 3);
else
v->mvrange = 0;
if (v->interlace) {
if (v->extended_dmv)
v->dmvrange = get_unary(gb, 0, 3);
else
v->dmvrange = 0;
if (v->fcm == ILACE_FRAME) { // interlaced frame picture
v->fourmvswitch = get_bits1(gb);
v->intcomp = get_bits1(gb);
if (v->intcomp) {
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
INIT_LUT(v->lumscale, v->lumshift, v->last_luty[0], v->last_lutuv[0], 1);
INIT_LUT(v->lumscale, v->lumshift, v->last_luty[1], v->last_lutuv[1], 1);
v->last_use_ic = 1;
}
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "SKIPMB plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->mbmodetab = get_bits(gb, 2);
if (v->fourmvswitch)
v->mbmode_vlc = ff_vc1_intfr_4mv_mbmode_vlc[v->mbmodetab];
else
v->mbmode_vlc = ff_vc1_intfr_non4mv_mbmode_vlc[v->mbmodetab];
v->imvtab = get_bits(gb, 2);
v->imv_vlc = ff_vc1_1ref_mvdata_vlc[v->imvtab];
// interlaced p-picture cbpcy range is [1, 63]
v->icbptab = get_bits(gb, 3);
v->cbpcy_vlc = ff_vc1_icbpcy_vlc[v->icbptab];
v->twomvbptab = get_bits(gb, 2);
v->twomvbp_vlc = ff_vc1_2mv_block_pattern_vlc[v->twomvbptab];
if (v->fourmvswitch) {
v->fourmvbptab = get_bits(gb, 2);
v->fourmvbp_vlc = ff_vc1_4mv_block_pattern_vlc[v->fourmvbptab];
}
}
}
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
v->range_x = 1 << (v->k_x - 1);
v->range_y = 1 << (v->k_y - 1);
v->tt_index = (v->pq > 4) + (v->pq > 12);
if (v->fcm != ILACE_FRAME) {
int mvmode;
mvmode = get_unary(gb, 1, 4);
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table[lowquant][mvmode];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
int mvmode2;
mvmode2 = get_unary(gb, 1, 3);
v->mv_mode2 = ff_vc1_mv_pmode_table2[lowquant][mvmode2];
if (v->field_mode) {
v->intcompfield = decode210(gb) ^ 3;
} else
v->intcompfield = 3;
v->lumscale2 = v->lumscale = 32;
v->lumshift2 = v->lumshift = 0;
if (v->intcompfield & 1) {
v->lumscale = get_bits(gb, 6);
v->lumshift = get_bits(gb, 6);
}
if ((v->intcompfield & 2) && v->field_mode) {
v->lumscale2 = get_bits(gb, 6);
v->lumshift2 = get_bits(gb, 6);
} else if(!v->field_mode) {
v->lumscale2 = v->lumscale;
v->lumshift2 = v->lumshift;
}
if (v->field_mode && v->second_field) {
if (v->cur_field_type) {
INIT_LUT(v->lumscale , v->lumshift , v->curr_luty[v->cur_field_type^1], v->curr_lutuv[v->cur_field_type^1], 0);
INIT_LUT(v->lumscale2, v->lumshift2, v->last_luty[v->cur_field_type ], v->last_lutuv[v->cur_field_type ], 1);
} else {
INIT_LUT(v->lumscale2, v->lumshift2, v->curr_luty[v->cur_field_type^1], v->curr_lutuv[v->cur_field_type^1], 0);
INIT_LUT(v->lumscale , v->lumshift , v->last_luty[v->cur_field_type ], v->last_lutuv[v->cur_field_type ], 1);
}
v->next_use_ic = *v->curr_use_ic = 1;
} else {
INIT_LUT(v->lumscale , v->lumshift , v->last_luty[0], v->last_lutuv[0], 1);
INIT_LUT(v->lumscale2, v->lumshift2, v->last_luty[1], v->last_lutuv[1], 1);
}
v->last_use_ic = 1;
}
v->qs_last = v->s.quarter_sample;
if (v->mv_mode == MV_PMODE_INTENSITY_COMP) {
v->s.quarter_sample = (v->mv_mode2 != MV_PMODE_1MV_HPEL &&
v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode2 != MV_PMODE_1MV_HPEL_BILIN);
} else {
v->s.quarter_sample = (v->mv_mode != MV_PMODE_1MV_HPEL &&
v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
v->s.mspel = (v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
}
}
if (v->fcm == PROGRESSIVE) { // progressive
if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
v->mv_mode2 == MV_PMODE_MIXED_MV)
|| v->mv_mode == MV_PMODE_MIXED_MV) {
status = bitplane_decoding(v->mv_type_mb_plane, &v->mv_type_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB MV Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
} else {
v->mv_type_is_raw = 0;
memset(v->mv_type_mb_plane, 0, v->s.mb_stride * v->s.mb_height);
}
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
/* Hopefully this is correct for P-frames */
v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables
v->cbptab = get_bits(gb, 2);
v->cbpcy_vlc = ff_vc1_cbpcy_p_vlc[v->cbptab];
} else if (v->fcm == ILACE_FRAME) { // frame interlaced
v->qs_last = v->s.quarter_sample;
v->s.quarter_sample = 1;
v->s.mspel = 1;
} else { // field interlaced
v->mbmodetab = get_bits(gb, 3);
v->imvtab = get_bits(gb, 2 + v->numref);
if (!v->numref)
v->imv_vlc = ff_vc1_1ref_mvdata_vlc[v->imvtab];
else
v->imv_vlc = ff_vc1_2ref_mvdata_vlc[v->imvtab];
v->icbptab = get_bits(gb, 3);
v->cbpcy_vlc = ff_vc1_icbpcy_vlc[v->icbptab];
if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
v->mv_mode2 == MV_PMODE_MIXED_MV) || v->mv_mode == MV_PMODE_MIXED_MV) {
v->fourmvbptab = get_bits(gb, 2);
v->fourmvbp_vlc = ff_vc1_4mv_block_pattern_vlc[v->fourmvbptab];
v->mbmode_vlc = ff_vc1_if_mmv_mbmode_vlc[v->mbmodetab];
} else {
v->mbmode_vlc = ff_vc1_if_1mv_mbmode_vlc[v->mbmodetab];
}
}
if (v->dquant) {
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
vop_dquant_decoding(v);
}
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
} else
v->ttfrm = 0; //FIXME Is that so ?
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
case AV_PICTURE_TYPE_B:
if (v->fcm == ILACE_FRAME) {
if (read_bfraction(v, gb) < 0)
return AVERROR_INVALIDDATA;
if (v->bfraction == 0) {
return -1;
}
}
if (v->extended_mv)
v->mvrange = get_unary(gb, 0, 3);
else
v->mvrange = 0;
v->k_x = v->mvrange + 9 + (v->mvrange >> 1); //k_x can be 9 10 12 13
v->k_y = v->mvrange + 8; //k_y can be 8 9 10 11
v->range_x = 1 << (v->k_x - 1);
v->range_y = 1 << (v->k_y - 1);
v->tt_index = (v->pq > 4) + (v->pq > 12);
if (v->field_mode) {
int mvmode;
av_log(v->s.avctx, AV_LOG_DEBUG, "B Fields\n");
if (v->extended_dmv)
v->dmvrange = get_unary(gb, 0, 3);
mvmode = get_unary(gb, 1, 3);
lowquant = (v->pq > 12) ? 0 : 1;
v->mv_mode = ff_vc1_mv_pmode_table2[lowquant][mvmode];
v->qs_last = v->s.quarter_sample;
v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV || v->mv_mode == MV_PMODE_MIXED_MV);
v->s.mspel = (v->mv_mode != MV_PMODE_1MV_HPEL_BILIN);
status = bitplane_decoding(v->forward_mb_plane, &v->fmb_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Forward Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->mbmodetab = get_bits(gb, 3);
if (v->mv_mode == MV_PMODE_MIXED_MV)
v->mbmode_vlc = ff_vc1_if_mmv_mbmode_vlc[v->mbmodetab];
else
v->mbmode_vlc = ff_vc1_if_1mv_mbmode_vlc[v->mbmodetab];
v->imvtab = get_bits(gb, 3);
v->imv_vlc = ff_vc1_2ref_mvdata_vlc[v->imvtab];
v->icbptab = get_bits(gb, 3);
v->cbpcy_vlc = ff_vc1_icbpcy_vlc[v->icbptab];
if (v->mv_mode == MV_PMODE_MIXED_MV) {
v->fourmvbptab = get_bits(gb, 2);
v->fourmvbp_vlc = ff_vc1_4mv_block_pattern_vlc[v->fourmvbptab];
}
v->numref = 1; // interlaced field B pictures are always 2-ref
} else if (v->fcm == ILACE_FRAME) {
if (v->extended_dmv)
v->dmvrange = get_unary(gb, 0, 3);
if (get_bits1(gb)) /* intcomp - present but shall always be 0 */
av_log(v->s.avctx, AV_LOG_WARNING, "Intensity compensation set for B picture\n");
v->intcomp = 0;
v->mv_mode = MV_PMODE_1MV;
v->fourmvswitch = 0;
v->qs_last = v->s.quarter_sample;
v->s.quarter_sample = 1;
v->s.mspel = 1;
status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->mbmodetab = get_bits(gb, 2);
v->mbmode_vlc = ff_vc1_intfr_non4mv_mbmode_vlc[v->mbmodetab];
v->imvtab = get_bits(gb, 2);
v->imv_vlc = ff_vc1_1ref_mvdata_vlc[v->imvtab];
// interlaced p/b-picture cbpcy range is [1, 63]
v->icbptab = get_bits(gb, 3);
v->cbpcy_vlc = ff_vc1_icbpcy_vlc[v->icbptab];
v->twomvbptab = get_bits(gb, 2);
v->twomvbp_vlc = ff_vc1_2mv_block_pattern_vlc[v->twomvbptab];
v->fourmvbptab = get_bits(gb, 2);
v->fourmvbp_vlc = ff_vc1_4mv_block_pattern_vlc[v->fourmvbptab];
} else {
v->mv_mode = get_bits1(gb) ? MV_PMODE_1MV : MV_PMODE_1MV_HPEL_BILIN;
v->qs_last = v->s.quarter_sample;
v->s.quarter_sample = (v->mv_mode == MV_PMODE_1MV);
v->s.mspel = v->s.quarter_sample;
status = bitplane_decoding(v->direct_mb_plane, &v->dmb_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Direct Type plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
status = bitplane_decoding(v->s.mbskip_table, &v->skip_is_raw, v);
if (status < 0)
return -1;
av_log(v->s.avctx, AV_LOG_DEBUG, "MB Skip plane encoding: "
"Imode: %i, Invert: %i\n", status>>1, status&1);
v->s.mv_table_index = get_bits(gb, 2);
v->cbptab = get_bits(gb, 2);
v->cbpcy_vlc = ff_vc1_cbpcy_p_vlc[v->cbptab];
}
if (v->dquant) {
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
vop_dquant_decoding(v);
}
if (v->vstransform) {
v->ttmbf = get_bits1(gb);
if (v->ttmbf) {
v->ttfrm = ff_vc1_ttfrm_to_tt[get_bits(gb, 2)];
} else
v->ttfrm = 0;
} else {
v->ttmbf = 1;
v->ttfrm = TT_8X8;
}
break;
}
/* AC Syntax */
v->c_ac_table_index = decode012(gb);
if (v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI) {
v->y_ac_table_index = decode012(gb);
}
else if (v->fcm != PROGRESSIVE && !v->s.quarter_sample) {
v->range_x <<= 1;
v->range_y <<= 1;
}
/* DC Syntax */
v->s.dc_table_index = get_bits1(gb);
if ((v->s.pict_type == AV_PICTURE_TYPE_I || v->s.pict_type == AV_PICTURE_TYPE_BI)
&& v->dquant) {
av_log(v->s.avctx, AV_LOG_DEBUG, "VOP DQuant info\n");
vop_dquant_decoding(v);
}
v->bi_type = (v->s.pict_type == AV_PICTURE_TYPE_BI);
if (v->bi_type)
v->s.pict_type = AV_PICTURE_TYPE_B;
return 0;
}
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