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934982c4ac
ffmpeg/libavcodec/vc9.c
Michael Niedermayer 934982c4ac avoid buf_size == 0 checks in every decoder 
Originally committed as revision 3872 to svn://svn.ffmpeg.org/ffmpeg/trunk
2005-01-23 18:09:06 +00:00

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/*
* VC-9 and WMV3 decoder
* Copyright (c) 2005 Anonymous
* Copyright (c) 2005 Alex Beregszaszi
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* @file vc9.c
* VC-9 and WMV3 decoder
*
* TODO: Norm-6 bitplane imode, most AP stuff, optimize, all of MB layer :)
* TODO: use MPV_ !!
*/
#include "common.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "vc9data.h"
/* Some inhibiting stuff */
#define HAS_ADVANCED_PROFILE 1
#define TRACE 1
#if TRACE
# define INIT_VLC(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, \
codes, codes_wrap, codes_size, use_static) \
if (init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, \
codes, codes_wrap, codes_size, use_static) < 0) \
{ \
av_log(v->avctx, AV_LOG_ERROR, "Error for " # vlc " (%i)\n", i); \
return -1; \
}
#else
# define INIT_VLC(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, \
codes, codes_wrap, codes_size, use_static) \
init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, \
codes, codes_wrap, codes_size, use_static)
#endif
#define PROFILE_SIMPLE 0
#define PROFILE_MAIN 1
#define PROFILE_ADVANCED 3
#define QUANT_FRAME_IMPLICIT 0
#define QUANT_FRAME_EXPLICIT 1
#define QUANT_NON_UNIFORM 2
#define QUANT_UNIFORM 3
/* Where quant can be changed */
#define DQPROFILE_FOUR_EDGES 0
#define DQPROFILE_DOUBLE_EDGES 1
#define DQPROFILE_SINGLE_EDGE 2
#define DQPROFILE_ALL_MBS 3
/* Which edge is quantized with ALTPQUANT */
#define DQSINGLE_BEDGE_LEFT 0
#define DQSINGLE_BEDGE_TOP 1
#define DQSINGLE_BEDGE_RIGHT 2
#define DQSINGLE_BEDGE_BOTTOM 3
/* Which pair of edges is quantized with ALTPQUANT */
#define DQDOUBLE_BEDGE_TOPLEFT 0
#define DQDOUBLE_BEDGE_TOPRIGHT 1
#define DQDOUBLE_BEDGE_BOTTOMRIGHT 2
#define DQDOUBLE_BEDGE_BOTTOMLEFT 3
/* Start Codes */
#define SEQ_SC 0x00000010F /* Sequence Start Code */
#define SEQ_EC 0x00000000A /* Sequence End code */
#define SEQ_HDR /* Sequence Header */
#define ENTRY_SC 0x00000010E /* Entry Point Start Code */
#define ENTRY_HDR /* Entry Point Header */
#define FRM_SC 0x00000010D /* Frame Start Code */
#define FRM_DAT /* Frame Data (includes a Frame Header) */
#define FLD_SC 0x00000010C /* Field Start Code */
#define FLD1_DAT /* Field 1 Data (includes a Frame Header) */
#define FLD2_DAT /* Field 2 Data (includes a Field Header) */
#define SLC_SC 0x00000010B /* Slice Start Code */
#define SLC_HDR /* Slice Header */
#define SLC_DAT /* Slice Data (FrH or FiH possible) */
/* MV P modes */
#define MV_PMODE_1MV_HPEL_BILIN 0
#define MV_PMODE_1MV 1
#define MV_PMODE_1MV_HPEL 2
#define MV_PMODE_MIXED_MV 3
#define MV_PMODE_INTENSITY_COMP 4
/* MV P mode - the 5th element is only used for mode 1 */
static const uint8_t mv_pmode_table[2][5] = {
{ MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_1MV, MV_PMODE_1MV_HPEL, MV_PMODE_MIXED_MV, MV_PMODE_INTENSITY_COMP },
{ MV_PMODE_1MV, MV_PMODE_MIXED_MV, MV_PMODE_1MV_HPEL, MV_PMODE_1MV_HPEL_BILIN, MV_PMODE_INTENSITY_COMP }
};
/* One more frame type */
#define BI_TYPE 7
/* FIXME Worse than ugly */
static const int fps_nr[5] = { 24, 25, 30, 50, 60 },
fps_dr[2] = { 1000, 1001 };
static const uint8_t pquant_table[3][32] = {
{ /* Implicit quantizer */
0, 1, 2, 3, 4, 5, 6, 7, 8, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 29, 31
},
{ /* Explicit quantizer, pquantizer uniform */
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31
},
{ /* Explicit quantizer, pquantizer non-uniform */
0, 1, 1, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 31
}
};
// FIXME move this into the context
#define VC9_BFRACTION_VLC_BITS 7
static VLC vc9_bfraction_vlc;
#define VC9_IMODE_VLC_BITS 4
static VLC vc9_imode_vlc;
#define VC9_NORM2_VLC_BITS 3
static VLC vc9_norm2_vlc;
/* Could be optimized, one table only needs 8 bits */
#define VC9_TTMB_VLC_BITS 12
static VLC vc9_ttmb_vlc[3];
#define VC9_MV_DIFF_VLC_BITS 15
static VLC vc9_mv_diff_vlc[4];
#define VC9_CBPCY_I_VLC_BITS 13
static VLC vc9_cbpcy_i_vlc;
#define VC9_CBPCY_P_VLC_BITS 14
static VLC vc9_cbpcy_p_vlc[4];
#define VC9_4MV_BLOCK_PATTERN_VLC_BITS 6
static VLC vc9_4mv_block_pattern_vlc[4];
#define VC9_LUMA_DC_VLC_BITS 26
static VLC vc9_luma_dc_vlc[2];
typedef struct VC9Context{
/* No MpegEnc context, might be good to use it */
GetBitContext gb;
AVCodecContext *avctx;
/***************************/
/* Sequence Header */
/***************************/
/* Simple/Main Profile */
int res_sm; //reserved, 2b
int res_x8; //reserved
int multires; //frame-level RESPIC syntax element present
int res_fasttx; //always 1
int res_transtab; //always 0
int syncmarker; //Sync markers presents
int rangered; //RANGEREDFRM (range reduction) syntax element present
int res_rtm_flag; //reserved, set to 1
int reserved; //duh
#if HAS_ADVANCED_PROFILE
/* Advanced Profile */
int level; //3
int chromaformat; //2
int postprocflag; //frame-based processing use
int broadcast; //TFF/RFF present
int interlace; //Progressive/interlaced (RPTFTM syntax element)
int tfcntrflag; //TFCNTR present
int panscanflag; //NUMPANSCANWIN, TOPLEFT{X,Y}, BOTRIGHT{X,Y} presents
int extended_dmv;
int color_prim; //8
int transfer_char; //8
int matrix_coef; //8
int hrd_param_flag;
#endif
/* All Profiles */
/* TODO: move all int to flags */
int profile; //2
int frmrtq_postproc; //3
int bitrtq_postproc; //5
int loopfilter;
int fastuvmc; //Rounding of qpel vector to hpel ? (not in Simple)
int extended_mv; //Ext MV in P/B (not in Simple)
int dquant; //Q varies with MBs, 2bits (not in Simple)
int vstransform; //variable-size transform46
int overlap; //overlapped transforms in use
int quantizer_mode; //2, quantizer mode used for sequence, see QUANT_*
int finterpflag; //INTERPFRM present
/*****************************/
/* Frame decoding */
/*****************************/
/* All profiles */
uint8_t mv_mode, mv_mode2; /* MV coding mode */
uint8_t pict_type; /* Picture type, mapped on MPEG types */
uint8_t pq, altpq; /* Quantizers */
uint8_t dquantfrm, dqprofile, dqsbedge, dqbilevel; /* pquant parameters */
int width_mb, height_mb;
int tile; /* 3x2 if (width_mb%3) else 2x3 */
int transacfrm2, transacfrm, transacdctab; //1bit elements
uint8_t ttmbf, ttfrm; /* Transform type */
uint8_t lumscale, lumshift; /* Luma compensation parameters */
int16_t bfraction; /* Relative position % anchors=> how to scale MVs */
uint8_t halfpq; /* Uniform quant over image and qp+.5 */
uint8_t respic;
/* Ranges:
* 0 -> [-64n 63.f] x [-32, 31.f]
* 1 -> [-128, 127.f] x [-64, 63.f]
* 2 -> [-512, 511.f] x [-128, 127.f]
* 3 -> [-1024, 1023.f] x [-256, 255.f]
*/
uint8_t mvrange;
uint8_t pquantizer;
VLC *cbpcy_vlc /* Current CBPCY VLC table */,
*mv_diff_vlc /* Current MV Diff VLC table */,
*ttmb_vlc /* Current MB Transform Type VLC table */;
uint8_t *mv_type_mb_plane; /* bitplane for mv_type == "raw" */
uint8_t *skip_mb_plane, /* bitplane for skipped MBs */
*direct_mb_plane; /* bitplane for "direct" MBs */
/* S/M only ? */
uint8_t rangeredfrm, interpfrm;
#if HAS_ADVANCED_PROFILE
/* Advanced */
uint8_t fcm; //0->Progressive, 2->Frame-Interlace, 3->Field-Interlace
uint8_t numpanscanwin;
uint8_t tfcntr;
uint8_t rptfrm, tff, rff;
uint8_t topleftx;
uint8_t toplefty;
uint8_t bottomrightx;
uint8_t bottomrighty;
uint8_t rndctrl;
uint8_t uvsamp;
uint8_t postproc;
int hrd_num_leaky_buckets;
uint8_t bit_rate_exponent;
uint8_t buffer_size_exponent;
uint8_t *ac_pred_plane;
uint8_t *over_flags_plane;
uint16_t *hrd_rate, *hrd_buffer;
#endif
} VC9Context;
/* FIXME Slow and ugly */
static int get_prefix(GetBitContext *gb, int stop, int len)
{
int i = 0, tmp = !stop;
while (i != len && tmp != stop)
{
tmp = get_bits(gb, 1);
i++;
}
return i;
}
static int init_common(VC9Context *v)
{
static int done = 0;
int i;
v->mv_type_mb_plane = v->direct_mb_plane = v->skip_mb_plane = NULL;
v->pq = -1;
#if HAS_ADVANCED_PROFILE
v->ac_pred_plane = v->over_flags_plane = NULL;
v->hrd_rate = v->hrd_buffer = NULL;
#endif
if(!done)
{
done = 1;
INIT_VLC(&vc9_bfraction_vlc, VC9_BFRACTION_VLC_BITS, 23,
vc9_bfraction_bits, 1, 1,
vc9_bfraction_codes, 1, 1, 1);
INIT_VLC(&vc9_norm2_vlc, VC9_NORM2_VLC_BITS, 4,
vc9_norm2_bits, 1, 1,
vc9_norm2_codes, 1, 1, 1);
INIT_VLC(&vc9_cbpcy_i_vlc, VC9_CBPCY_I_VLC_BITS, 64,
vc9_cbpcy_i_bits, 1, 1,
vc9_cbpcy_i_codes, 2, 2, 1);
INIT_VLC(&vc9_imode_vlc, VC9_IMODE_VLC_BITS, 7,
vc9_imode_bits, 1, 1,
vc9_imode_codes, 1, 1, 1);
for(i=0; i<3; i++)
{
INIT_VLC(&vc9_4mv_block_pattern_vlc[i], VC9_4MV_BLOCK_PATTERN_VLC_BITS, 16,
vc9_4mv_block_pattern_bits[i], 1, 1,
vc9_4mv_block_pattern_codes[i], 1, 1, 1);
INIT_VLC(&vc9_cbpcy_p_vlc[i], VC9_CBPCY_P_VLC_BITS, 64,
vc9_cbpcy_p_bits[i], 1, 1,
vc9_cbpcy_p_codes[i], 2, 2, 1);
}
for (i=0; i<2; i++)
{
INIT_VLC(&vc9_mv_diff_vlc[i], VC9_MV_DIFF_VLC_BITS, 73,
vc9_mv_diff_bits[i], 1, 1,
vc9_mv_diff_codes[i], 2, 2, 1);
INIT_VLC(&vc9_luma_dc_vlc[i], VC9_LUMA_DC_VLC_BITS, 26,
vc9_luma_dc_bits[i], 1, 1,
vc9_luma_dc_codes[i], 4, 4, 1);
INIT_VLC(&vc9_ttmb_vlc[i], VC9_TTMB_VLC_BITS, 16,
vc9_ttmb_bits[i], 1, 1,
vc9_ttmb_codes[i], 2, 2, 1);
}
}
return 0;
}
#if HAS_ADVANCED_PROFILE
static int decode_hrd(VC9Context *v, GetBitContext *gb)
{
int i, num;
num = get_bits(gb, 5);
if (v->hrd_rate || num != v->hrd_num_leaky_buckets)
{
av_free(v->hrd_rate);
v->hrd_rate = NULL;
}
if (!v->hrd_rate) v->hrd_rate = av_malloc(num);
if (!v->hrd_rate) return -1;
if (v->hrd_buffer || num != v->hrd_num_leaky_buckets)
{
av_free(v->hrd_buffer);
v->hrd_buffer = NULL;
}
if (!v->hrd_buffer) v->hrd_buffer = av_malloc(num);
if (!v->hrd_buffer) return -1;
v->hrd_num_leaky_buckets = num;
//exponent in base-2 for rate
v->bit_rate_exponent = get_bits(gb, 4);
//exponent in base-2 for buffer_size
v->buffer_size_exponent = get_bits(gb, 4);
for (i=0; i<num; i++)
{
//mantissae, ordered (if not, use a function ?
v->hrd_rate[i] = get_bits(gb, 16);
if (i && v->hrd_rate[i-1]>=v->hrd_rate[i])
{
av_log(v, AV_LOG_ERROR, "HDR Rates aren't strictly increasing:"
"%i vs %i\n", v->hrd_rate[i-1], v->hrd_rate[i]);
return -1;
}
v->hrd_buffer[i] = get_bits(gb, 16);
if (i && v->hrd_buffer[i-1]<v->hrd_buffer[i])
{
av_log(v, AV_LOG_ERROR, "HDR Buffers aren't decreasing:"
"%i vs %i\n", v->hrd_buffer[i-1], v->hrd_buffer[i]);
return -1;
}
}
return 0;
}
static int decode_advanced_sequence_header(AVCodecContext *avctx, GetBitContext *gb)
{
VC9Context *v = avctx->priv_data;
int nr, dr, aspect_ratio;
v->postprocflag = get_bits(gb, 1);
v->broadcast = get_bits(gb, 1);
v->interlace = get_bits(gb, 1);
v->tfcntrflag = get_bits(gb, 1);
v->finterpflag = get_bits(gb, 1); //common
v->panscanflag = get_bits(gb, 1);
v->reserved = get_bits(gb, 1);
if (v->reserved)
{
av_log(avctx, AV_LOG_ERROR, "RESERVED should be 0 (is %i)\n",
v->reserved);
return -1;
}
if (v->extended_mv)
v->extended_dmv = get_bits(gb, 1);
if (get_bits(gb, 1) /* pic_size_flag */)
{
avctx->coded_width = get_bits(gb, 12);
avctx->coded_height = get_bits(gb, 12);
if ( get_bits(gb, 1) /* disp_size_flag */)
{
avctx->width = get_bits(gb, 14);
avctx->height = get_bits(gb, 14);
}
if ( get_bits(gb, 1) /* aspect_ratio_flag */)
{
aspect_ratio = get_bits(gb, 4); //SAR
if (aspect_ratio == 0x0F) //FF_ASPECT_EXTENDED
{
avctx->sample_aspect_ratio.num = get_bits(gb, 8);
avctx->sample_aspect_ratio.den = get_bits(gb, 8);
}
else if (aspect_ratio == 0x0E)
{
av_log(avctx, AV_LOG_DEBUG, "Reserved AR found\n");
}
else
{
avctx->sample_aspect_ratio = vc9_pixel_aspect[aspect_ratio];
}
}
}
else
{
avctx->coded_width = avctx->width;
avctx->coded_height = avctx->height;
}
if ( get_bits(gb, 1) /* framerateflag */)
{
if ( get_bits(gb, 1) /* framerateind */)
{
nr = get_bits(gb, 8);
dr = get_bits(gb, 4);
if (nr<1)
{
av_log(avctx, AV_LOG_ERROR, "0 is forbidden for FRAMERATENR\n");
return -1;
}
if (nr>5)
{
av_log(avctx, AV_LOG_ERROR,
"Reserved FRAMERATENR %i not handled\n", nr);
}
if (dr<1)
{
av_log(avctx, AV_LOG_ERROR, "0 is forbidden for FRAMERATEDR\n");
}
if (dr>2)
{
av_log(avctx, AV_LOG_ERROR,
"Reserved FRAMERATEDR %i not handled\n", dr);
}
avctx->frame_rate_base = fps_nr[dr];
avctx->frame_rate = fps_nr[nr];
}
else
{
nr = get_bits(gb, 16);
// 0.03125->2048Hz / 0.03125Hz
avctx->frame_rate = 1000000;
avctx->frame_rate_base = 31250*(1+nr);
}
}
if ( get_bits(gb, 1) /* color_format_flag */)
{
//Chromacity coordinates of color primaries
//like ITU-R BT.709-2, BT.470-2, ...
v->color_prim = get_bits(gb, 8);
if (v->color_prim<1)
{
av_log(avctx, AV_LOG_ERROR, "0 for COLOR_PRIM is reserved\n");
return -1;
}
if (v->color_prim == 3 || v->color_prim>6)
{
av_log(avctx, AV_LOG_DEBUG, "Reserved COLOR_PRIM %i found\n",
v->color_prim);
return -1;
}
//Opto-electronic transfer characteristics
v->transfer_char = get_bits(gb, 8);
if (v->transfer_char == 3 || v->transfer_char>8)
{
av_log(avctx, AV_LOG_DEBUG, "Reserved TRANSFERT_CHAR %i found\n",
v->color_prim);
return -1;
}
//Matrix coefficient for primariev->YCbCr
v->matrix_coef = get_bits(gb, 8);
if (v->matrix_coef < 1) return -1; //forbidden
if ((v->matrix_coef>3 && v->matrix_coef<6) || v->matrix_coef>7)
{
av_log(avctx, AV_LOG_DEBUG, "Reserved MATRIX_COEF %i found\n",
v->color_prim);
return -1;
}
}
//Hypothetical reference decoder indicator flag
v->hrd_param_flag = get_bits(gb, 1);
if (v->hrd_param_flag)
{
if (decode_hrd(v, gb) < 0) return -1;
}
av_log(avctx, AV_LOG_DEBUG, "Advanced profile not supported yet\n");
return -1;
}
#endif
static int decode_sequence_header(AVCodecContext *avctx, GetBitContext *gb)
{
VC9Context *v = avctx->priv_data;
v->profile = get_bits(gb, 2);
av_log(avctx, AV_LOG_DEBUG, "Profile: %i\n", v->profile);
#if HAS_ADVANCED_PROFILE
if (v->profile > PROFILE_MAIN)
{
v->level = get_bits(gb, 3);
v->chromaformat = get_bits(gb, 2);
if (v->chromaformat != 1)
{
av_log(avctx, AV_LOG_ERROR,
"Only 4:2:0 chroma format supported\n");
return -1;
}
}
else
#endif
{
v->res_sm = get_bits(gb, 2); //reserved
if (v->res_sm)
{
av_log(avctx, AV_LOG_ERROR,
"Reserved RES_SM=%i is forbidden\n", v->res_sm);
//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->loopfilter = get_bits(gb, 1); //common
#if HAS_ADVANCED_PROFILE
if (v->profile <= PROFILE_MAIN)
#endif
{
v->res_x8 = get_bits(gb, 1); //reserved
if (v->res_x8)
{
av_log(avctx, AV_LOG_ERROR,
"1 for reserved RES_X8 is forbidden\n");
return -1;
}
v->multires = get_bits(gb, 1);
v->res_fasttx = get_bits(gb, 1);
if (!v->res_fasttx)
{
av_log(avctx, AV_LOG_ERROR,
"0 for reserved RES_FASTTX is forbidden\n");
//return -1;
}
}
v->fastuvmc = get_bits(gb, 1); //common
if (!v->profile && !v->fastuvmc)
{
av_log(avctx, AV_LOG_ERROR,
"FASTUVMC unavailable in Simple Profile\n");
return -1;
}
v->extended_mv = get_bits(gb, 1); //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_bits(gb, 1); //common
#if HAS_ADVANCED_PROFILE
if (v->profile <= PROFILE_MAIN)
#endif
{
v->res_transtab = get_bits(gb, 1);
if (v->res_transtab)
{
av_log(avctx, AV_LOG_ERROR,
"1 for reserved RES_TRANSTAB is forbidden\n");
return -1;
}
}
v->overlap = get_bits(gb, 1); //common
#if HAS_ADVANCED_PROFILE
if (v->profile <= PROFILE_MAIN)
#endif
{
v->syncmarker = get_bits(gb, 1);
v->rangered = get_bits(gb, 1);
}
avctx->max_b_frames = get_bits(gb, 3); //common
v->quantizer_mode = get_bits(gb, 2); //common
#if HAS_ADVANCED_PROFILE
if (v->profile <= PROFILE_MAIN)
#endif
{
v->finterpflag = get_bits(gb, 1); //common
v->res_rtm_flag = get_bits(gb, 1); //reserved
if (!v->res_rtm_flag)
{
av_log(avctx, AV_LOG_ERROR,
"0 for reserved RES_RTM_FLAG is forbidden\n");
//return -1;
}
#if TRACE
av_log(avctx, AV_LOG_INFO,
"Profile %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
"LoopFilter=%i, MultiRes=%i, FastUVMV=%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->loopfilter, v->multires, v->fastuvmc, v->extended_mv,
v->rangered, v->vstransform, v->overlap, v->syncmarker,
v->dquant, v->quantizer_mode, avctx->max_b_frames
);
#endif
}
#if HAS_ADVANCED_PROFILE
else decode_advanced_sequence_header(avctx, gb);
#endif
}
#if HAS_ADVANCED_PROFILE
/*****************************************************************************/
/* Entry point decoding (Advanced Profile) */
/*****************************************************************************/
static int advanced_entry_point_process(AVCodecContext *avctx, GetBitContext *gb)
{
VC9Context *v = avctx->priv_data;
int range_mapy_flag, range_mapuv_flag, i;
if (v->profile != PROFILE_ADVANCED)
{
av_log(avctx, AV_LOG_ERROR,
"Entry point are only defined in Advanced Profile!\n");
return -1; //Only for advanced profile!
}
if (v->hrd_param_flag)
{
//Update buffer fullness
av_log(avctx, AV_LOG_DEBUG, "Buffer fullness update\n");
for (i=0; i<v->hrd_num_leaky_buckets; i++)
skip_bits(gb, 8);
}
if ((range_mapy_flag = get_bits(gb, 1)))
{
//RANGE_MAPY
av_log(avctx, AV_LOG_DEBUG, "RANGE_MAPY\n");
skip_bits(gb, 3);
}
if ((range_mapuv_flag = get_bits(gb, 1)))
{
//RANGE_MAPUV
av_log(avctx, AV_LOG_DEBUG, "RANGE_MAPUV\n");
skip_bits(gb, 3);
}
if (v->panscanflag)
{
//NUMPANSCANWIN
v->numpanscanwin = get_bits(gb, 3);
av_log(avctx, AV_LOG_DEBUG, "NUMPANSCANWIN: %u\n", v->numpanscanwin);
}
return 0;
}
#endif
/******************************************************************************/
/* Bitplane decoding */
/******************************************************************************/
#define IMODE_RAW 0
#define IMODE_NORM2 1
#define IMODE_DIFF2 2
#define IMODE_NORM6 3
#define IMODE_DIFF6 4
#define IMODE_ROWSKIP 5
#define IMODE_COLSKIP 6
//FIXME optimize
static int bitplane_decoding(uint8_t* plane, int width, int height, VC9Context *v)
{
int imode, x, y, code;
uint8_t invert, *planep = plane;
invert = get_bits(&v->gb, 1);
imode = get_vlc2(&v->gb, vc9_imode_vlc.table, VC9_IMODE_VLC_BITS, 2);
av_log(v->avctx, AV_LOG_DEBUG, "Bitplane: imode=%i, invert=%i\n",
imode, invert);
switch (imode)
{
case IMODE_RAW:
for (y=0; y<height; y++)
{
for (x=0; x<width; x++)
planep[x] = (-get_bits(&v->gb, 1)); //-1=0xFF
planep += width;
}
break;
case IMODE_DIFF2:
case IMODE_NORM2:
if ((height*width) & 1) *(++planep) = get_bits(&v->gb, 1);
code = get_vlc2(&v->gb, vc9_norm2_vlc.table, VC9_NORM2_VLC_BITS, 2);
*(++planep) = code&1; //lsb => left
*(++planep) = code&2; //msb => right - this is a bitplane, so only !0 matters
break;
case IMODE_DIFF6:
case IMODE_NORM6:
av_log(v->avctx, AV_LOG_ERROR, "Imode using Norm-6 isn't supported\n");
return -1;
break;
case IMODE_ROWSKIP:
for (y=0; y<height; y++)
{
if (get_bits(&v->gb, 1)) //rowskip
memset(planep, 0, width);
else for (x=0; x<width; x++) planep[x] = get_bits(&v->gb, 1);
planep += width;
}
break;
case IMODE_COLSKIP: //Teh ugly
for (x=0; x<width; x++)
{
planep = plane;
if (get_bits(&v->gb, 1)) //colskip
{
for (y=0; y<height; y++)
{
planep[x] = 0;
planep += width;
}
}
else
{
for (y=0; y<height; y++)
{
planep[x] = get_bits(&v->gb, 1);
planep += width;
}
}
}
break;
default: break;
}
/* Applying diff operator */
if (imode == IMODE_DIFF2 || imode == IMODE_DIFF2)
{
/* And what about j=0 !? */
planep = plane + width;
memset(plane, invert, width);
for (y=0; y<height; y++)
{
planep[0] = planep[-width];
for (x=1; x<width; x++)
{
if (planep[x-1] != planep[-width]) planep[x] = invert;
else planep[x] = planep[x-1];
}
planep += width;
}
}
else if (invert)
{
planep = plane;
for (x=0; x<width*height; x++) planep[x] = !planep[x];
}
return 0;
}
/*****************************************************************************/
/* VOP Dquant decoding */
/*****************************************************************************/
static int vop_dquant_decoding(VC9Context *v)
{
int pqdiff;
//variable size
if (v->dquant == 2)
{
pqdiff = get_bits(&v->gb, 3);
if (pqdiff == 7) v->altpq = get_bits(&v->gb, 5);
else v->altpq = v->pq + pqdiff + 1;
}
else
{
v->dquantfrm = get_bits(&v->gb, 1);
if ( v->dquantfrm )
{
v->dqprofile = get_bits(&v->gb, 2);
switch (v->dqprofile)
{
case DQPROFILE_SINGLE_EDGE:
case DQPROFILE_DOUBLE_EDGES:
v->dqsbedge = get_bits(&v->gb, 2);
break;
case DQPROFILE_ALL_MBS:
v->dqbilevel = get_bits(&v->gb, 1);
default: break; //Forbidden ?
}
if (!v->dqbilevel || v->dqprofile != DQPROFILE_ALL_MBS)
{
pqdiff = get_bits(&v->gb, 3);
if (pqdiff == 7) v->altpq = get_bits(&v->gb, 5);
else v->altpq = v->pq + pqdiff + 1;
}
}
}
return 0;
}
/*****************************************************************************/
/* All Profiles picture header decoding specific functions */
/* Only pro/epilog differs between Simple/Main and Advanced => check caller */
/*****************************************************************************/
static int decode_bi_picture_header(VC9Context *v)
{
/* Very particular case:
- for S/M Profiles, decode_b_picture_header reads BF,
bfraction then determine if this is a BI frame, calling
this function afterwards
- for A Profile, PTYPE already tells so and we can go
directly there
*/
int pqindex;
/* Read the quantization stuff */
pqindex = get_bits(&v->gb, 5);
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pq = pquant_table[0][pqindex];
else
{
v->pq = pquant_table[v->quantizer_mode-1][pqindex];
}
if (pqindex < 9) v->halfpq = get_bits(&v->gb, 1);
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
v->pquantizer = get_bits(&v->gb, 1);
/* Read the MV type/mode */
if (v->extended_mv == 1)
v->mvrange = get_prefix(&v->gb, 0, 3);
/* FIXME: what table are used in that case ? */
v->mv_diff_vlc = &vc9_mv_diff_vlc[0];
v->cbpcy_vlc = &vc9_cbpcy_i_vlc;
av_log(v->avctx, AV_LOG_DEBUG, "B frame, QP=%i\n", v->pq);
av_log(v->avctx, AV_LOG_ERROR, "BI_TYPE not supported yet\n");
/* Epilog should be done in caller */
return -1;
}
static int decode_b_picture_header(VC9Context *v)
{
int pqindex;
/* Prolog common to all frametypes should be done in caller */
if (v->profile == PROFILE_SIMPLE)
{
av_log(v, AV_LOG_ERROR, "Found a B frame while in Simple Profile!\n");
return FRAME_SKIPED;
}
v->bfraction = vc9_bfraction_lut[get_vlc2(&v->gb, vc9_bfraction_vlc.table,
VC9_BFRACTION_VLC_BITS, 2)];
if (v->bfraction < -1)
{
av_log(v, AV_LOG_ERROR, "Invalid BFRaction\n");
return FRAME_SKIPED;
}
else if (!v->bfraction)
{
/* We actually have a BI frame */
return decode_bi_picture_header(v);
}
/* Read the quantization stuff */
pqindex = get_bits(&v->gb, 5);
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pq = pquant_table[0][pqindex];
else
{
v->pq = pquant_table[v->quantizer_mode-1][pqindex];
}
if (pqindex < 9) v->halfpq = get_bits(&v->gb, 1);
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
v->pquantizer = get_bits(&v->gb, 1);
/* Read the MV type/mode */
if (v->extended_mv == 1)
v->mvrange = get_prefix(&v->gb, 0, 3);
v->mv_mode = get_bits(&v->gb, 1);
if (v->pq < 13)
{
if (!v->mv_mode)
{
v->mv_mode = get_bits(&v->gb, 2);
if (v->mv_mode)
av_log(v, AV_LOG_ERROR,
"mv_mode for lowquant B frame was %i\n", v->mv_mode);
}
}
else
{
if (!v->mv_mode)
{
if (get_bits(&v->gb, 1))
av_log(v, AV_LOG_ERROR,
"mv_mode for highquant B frame was %i\n", v->mv_mode);
}
v->mv_mode = 1-v->mv_mode; //To match (pq < 13) mapping
}
if (v->mv_mode == MV_PMODE_MIXED_MV)
{
if (bitplane_decoding( v->mv_type_mb_plane, v->width_mb,
v->height_mb, v)<0)
return -1;
}
//bitplane
bitplane_decoding(v->direct_mb_plane, v->width_mb, v->height_mb, v);
bitplane_decoding(v->skip_mb_plane, v->width_mb, v->height_mb, v);
/* FIXME: what is actually chosen for B frames ? */
v->mv_diff_vlc = &vc9_mv_diff_vlc[get_bits(&v->gb, 2)];
v->cbpcy_vlc = &vc9_cbpcy_p_vlc[get_bits(&v->gb, 2)];
if (v->dquant)
{
vop_dquant_decoding(v);
}
if (v->vstransform)
{
v->ttmbf = get_bits(&v->gb, 1);
if (v->ttmbf)
{
v->ttfrm = get_bits(&v->gb, 2);
av_log(v, AV_LOG_INFO, "Transform used: %ix%i\n",
(v->ttfrm & 2) ? 4 : 8, (v->ttfrm & 1) ? 4 : 8);
}
}
/* Epilog should be done in caller */
return 0;
}
static int decode_i_picture_header(VC9Context *v)
{
int pqindex, status = 0, ac_pred, condover;
/* Prolog common to all frametypes should be done in caller */
//BF = Buffer Fullness
if (v->profile <= PROFILE_MAIN && get_bits(&v->gb, 7))
{
av_log(v, AV_LOG_DEBUG, "I BufferFullness not 0\n");
}
/* Quantizer stuff */
pqindex = get_bits(&v->gb, 5);
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pq = pquant_table[0][pqindex];
else
{
v->pq = pquant_table[v->quantizer_mode-1][pqindex];
}
if (pqindex < 9) v->halfpq = get_bits(&v->gb, 1);
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
v->pquantizer = get_bits(&v->gb, 1);
av_log(v->avctx, AV_LOG_DEBUG, "I frame: QP=%i (+%i/2)\n",
v->pq, v->halfpq);
#if HAS_ADVANCED_PROFILE
if (v->profile <= PROFILE_MAIN)
#endif
{
if (v->extended_mv) v->mvrange = get_prefix(&v->gb, 0, 3);
if (v->multires) v->respic = get_bits(&v->gb, 2);
}
#if HAS_ADVANCED_PROFILE
else
{
ac_pred = get_bits(&v->gb, 1);
if (v->postprocflag) v->postproc = get_bits(&v->gb, 1);
/* 7.1.1.34 + 8.5.2 */
if (v->overlap && v->pq<9)
{
condover = get_bits(&v->gb, 1);
if (condover)
{
condover = 2+get_bits(&v->gb, 1);
if (condover == 3)
status = bitplane_decoding(v->over_flags_plane,
v->width_mb, v->height_mb, v);
}
}
}
#endif
/* Epilog should be done in caller */
return status;
}
static int decode_p_picture_header(VC9Context *v)
{
/* INTERFRM, FRMCNT, RANGEREDFRM read in caller */
int lowquant, pqindex;
pqindex = get_bits(&v->gb, 5);
if (v->quantizer_mode == QUANT_FRAME_IMPLICIT)
v->pq = pquant_table[0][pqindex];
else
{
v->pq = pquant_table[v->quantizer_mode-1][pqindex];
}
if (pqindex < 9) v->halfpq = get_bits(&v->gb, 1);
if (v->quantizer_mode == QUANT_FRAME_EXPLICIT)
v->pquantizer = get_bits(&v->gb, 1);
av_log(v->avctx, AV_LOG_DEBUG, "P Frame: QP=%i (+%i/2)\n",
v->pq, v->halfpq);
if (v->extended_mv == 1) v->mvrange = get_prefix(&v->gb, 0, 3);
#if HAS_ADVANCED_PROFILE
if (v->profile > PROFILE_MAIN)
{
if (v->postprocflag) v->postproc = get_bits(&v->gb, 1);
}
else
#endif
if (v->multires) v->respic = get_bits(&v->gb, 2);
lowquant = (v->pquantizer>12) ? 0 : 1;
v->mv_mode = mv_pmode_table[lowquant][get_prefix(&v->gb, 1, 4)];
if (v->mv_mode == MV_PMODE_INTENSITY_COMP)
{
v->mv_mode2 = mv_pmode_table[lowquant][get_prefix(&v->gb, 1, 3)];
v->lumscale = get_bits(&v->gb, 6);
v->lumshift = get_bits(&v->gb, 6);
}
if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
v->mv_mode2 == MV_PMODE_MIXED_MV)
|| v->mv_mode == MV_PMODE_MIXED_MV)
{
if (bitplane_decoding(v->mv_type_mb_plane, v->width_mb,
v->height_mb, v) < 0)
return -1;
}
if (bitplane_decoding(v->skip_mb_plane, v->width_mb,
v->height_mb, v) < 0)
return -1;
/* Hopefully this is correct for P frames */
v->mv_diff_vlc = &vc9_mv_diff_vlc[get_bits(&v->gb, 2)];
v->cbpcy_vlc = &vc9_cbpcy_p_vlc[get_bits(&v->gb, 2)];
if (v->dquant)
{
av_log(v->avctx, AV_LOG_INFO, "VOP DQuant info\n");
vop_dquant_decoding(v);
}
if (v->vstransform)
{
v->ttmbf = get_bits(&v->gb, 1);
if (v->ttmbf)
{
v->ttfrm = get_bits(&v->gb, 2);
av_log(v->avctx, AV_LOG_INFO, "Transform used: %ix%i\n",
(v->ttfrm & 2) ? 4 : 8, (v->ttfrm & 1) ? 4 : 8);
}
}
/* Epilog should be done in caller */
return 0;
}
static int standard_decode_picture_header(VC9Context *v)
{
int status = 0;
if (v->finterpflag) v->interpfrm = get_bits(&v->gb, 1);
skip_bits(&v->gb, 2); //framecnt unused
if (v->rangered) v->rangeredfrm = get_bits(&v->gb, 1);
v->pict_type = get_bits(&v->gb, 1);
if (v->avctx->max_b_frames && !v->pict_type)
{
if (get_bits(&v->gb, 1)) v->pict_type = I_TYPE;
else v->pict_type = P_TYPE;
}
else v->pict_type++; //P_TYPE
switch (v->pict_type)
{
case I_TYPE: status = decode_i_picture_header(v); break;
case BI_TYPE: status = decode_b_picture_header(v); break;
case P_TYPE: status = decode_p_picture_header(v); break;
case B_TYPE: status = decode_b_picture_header(v); break;
}
if (status == FRAME_SKIPED)
{
av_log(v, AV_LOG_INFO, "Skipping frame...\n");
return status;
}
/* AC/DC Syntax */
v->transacfrm = get_bits(&v->gb, 1);
if (v->transacfrm) v->transacfrm += get_bits(&v->gb, 1);
if (v->pict_type == I_TYPE || v->pict_type == BI_TYPE)
{
v->transacfrm2 = get_bits(&v->gb, 1);
if (v->transacfrm2) v->transacfrm2 += get_bits(&v->gb, 1);
}
v->transacdctab = get_bits(&v->gb, 1);
return 0;
}
#if HAS_ADVANCED_PROFILE
/******************************************************************************/
/* Advanced Profile picture header decoding specific functions */
/******************************************************************************/
static int advanced_decode_picture_header(VC9Context *v)
{
static const int type_table[4] = { P_TYPE, B_TYPE, I_TYPE, BI_TYPE };
int type, i, ret;
if (v->interlace)
{
v->fcm = get_bits(&v->gb, 1);
if (v->fcm) v->fcm = 2+get_bits(&v->gb, 1);
}
type = get_prefix(&v->gb, 0, 4);
if (type > 4 || type < 0) return FRAME_SKIPED;
v->pict_type = type_table[type];
av_log(v->avctx, AV_LOG_INFO, "AP Frame Type: %i\n", v->pict_type);
if (v->tfcntrflag) v->tfcntr = get_bits(&v->gb, 8);
if (v->broadcast)
{
if (!v->interlace) v->rptfrm = get_bits(&v->gb, 2);
else
{
v->tff = get_bits(&v->gb, 1);
v->rff = get_bits(&v->gb, 1);
}
}
if (v->panscanflag)
{
#if 0
for (i=0; i<v->numpanscanwin; i++)
{
v->topleftx[i] = get_bits(&v->gb, 16);
v->toplefty[i] = get_bits(&v->gb, 16);
v->bottomrightx[i] = get_bits(&v->gb, 16);
v->bottomrighty[i] = get_bits(&v->gb, 16);
}
#else
skip_bits(&v->gb, 16*4*v->numpanscanwin);
#endif
}
v->rndctrl = get_bits(&v->gb, 1);
v->uvsamp = get_bits(&v->gb, 1);
if (v->finterpflag == 1) v->interpfrm = get_bits(&v->gb, 1);
switch(v->pict_type)
{
case I_TYPE: if (decode_i_picture_header(v) < 0) return -1;
case P_TYPE: if (decode_p_picture_header(v) < 0) return -1;
case BI_TYPE:
case B_TYPE: if (decode_b_picture_header(v) < 0) return FRAME_SKIPED;
default: break;
}
/* AC/DC Syntax */
v->transacfrm = get_bits(&v->gb, 1);
if (v->transacfrm) v->transacfrm += get_bits(&v->gb, 1);
if (v->pict_type == I_TYPE || v->pict_type == BI_TYPE)
{
v->transacfrm2 = get_bits(&v->gb, 1);
if (v->transacfrm2) v->transacfrm2 += get_bits(&v->gb, 1);
}
v->transacdctab = get_bits(&v->gb, 1);
if (v->pict_type == I_TYPE) vop_dquant_decoding(v);
return 0;
}
#endif
/******************************************************************************/
/* MacroBlock decoding functions */
/******************************************************************************/
static int standard_decode_i_mbs(VC9Context *v)
{
int x, y, ac_pred, cbpcy;
/* Select ttmb table depending on pq */
if (v->pq < 5) v->ttmb_vlc = &vc9_ttmb_vlc[0];
else if (v->pq < 13) v->ttmb_vlc = &vc9_ttmb_vlc[1];
else v->ttmb_vlc = &vc9_ttmb_vlc[2];
for (y=0; y<v->height_mb; y++)
{
for (x=0; x<v->width_mb; x++)
{
cbpcy = get_vlc2(&v->gb, vc9_cbpcy_i_vlc.table,
VC9_CBPCY_I_VLC_BITS, 2);
ac_pred = get_bits(&v->gb, 1);
//Decode blocks from that mb wrt cbpcy
}
}
return 0;
}
#define GET_MQUANT() \
if (v->dquantfrm) \
{ \
if (v->dqprofile == DQPROFILE_ALL_MBS) \
{ \
if (v->dqbilevel) \
{ \
mquant = (get_bits(&v->gb, 1)) ? v->pq : v->altpq; \
} \
else \
{ \
mqdiff = get_bits(&v->gb, 3); \
if (mqdiff != 7) mquant = v->pq + mqdiff; \
else mquant = get_bits(&v->gb, 5); \
} \
} \
}
/* MVDATA decoding from 8.3.5.2 */
#define GET_MVDATA() \
index = 1 + get_vlc2(&v->gb, v->mv_diff_vlc->table, \
VC9_MV_DIFF_VLC_BITS, 2); \
if (index > 36) \
{ \
mb_has_coeffs = 1; \
index -= 37; \
} \
else mb_has_coeffs = 0; \
mb_is_intra = 0; \
if (!index) { dmv_x = dmv_y = 0; } \
else if (index == 35) \
{ \
dmv_x = get_bits(&v->gb, k_x); \
dmv_y = get_bits(&v->gb, k_y); \
mb_is_intra = 1; \
} \
else \
{ \
index1 = index%6; \
if (hpel_flag && index1 == 5) val = 1; \
else val = 0; \
val = get_bits(&v->gb, size_table[index1] - val); \
sign = 0 - (val&1); \
dmv_x = (sign ^ ((val>>1) + offset_table[index1])) - sign; \
\
index1 = index/6; \
if (hpel_flag && index1 == 5) val = 1; \
else val = 0; \
val = get_bits(&v->gb, size_table[index1] - val); \
sign = 0 - (val&1); \
dmv_y = (sign ^ ((val>>1) + offset_table[index1])) - sign; \
}
static int decode_p_mbs(VC9Context *v)
{
int x, y, current_mb = 0, i; /* MB/Block Position info */
int skip_mb_bit = 0, cbpcy; /* MB/B skip */
int hybrid_pred, ac_pred; /* Prediction types */
int mb_has_coeffs = 1 /* last_flag */, mb_is_intra;
int dmv_x, dmv_y; /* Differential MV components */
int mv_mode_bit = 0; /* mv_mode_bit: 1MV=0, 4MV=0 */
int mqdiff, mquant; /* MB quantization */
int tt_block; /* MB Transform type */
static const int size_table[6] = { 0, 2, 3, 4, 5, 8 },
offset_table[6] = { 0, 1, 3, 7, 15, 31 };
int k_x, k_y; /* Long MV fixed bitlength */
int hpel_flag, intra_flag; /* Some MB properties */
int index, index1; /* LUT indices */
int val, sign;
/* Select ttmb table depending on pq */
if (v->pq < 5) v->ttmb_vlc = &vc9_ttmb_vlc[0];
else if (v->pq < 13) v->ttmb_vlc = &vc9_ttmb_vlc[1];
else v->ttmb_vlc = &vc9_ttmb_vlc[2];
/* Select proper long MV range */
switch (v->mvrange)
{
case 1: k_x = 10; k_y = 9; break;
case 2: k_x = 12; k_y = 10; break;
case 3: k_x = 13; k_y = 11; break;
default: /*case 0 too */ k_x = 9; k_y = 8; break;
}
hpel_flag = v->mv_mode & 1; //MV_PMODE is HPEL
k_x -= hpel_flag;
k_y -= hpel_flag;
for (y=0; y<v->height_mb; y++)
{
for (x=0; x<v->width_mb; x++)
{
if (v->mv_type_mb_plane[current_mb])
mv_mode_bit = get_bits(&v->gb, 1);
if (0) //skipmb is rawmode
skip_mb_bit = get_bits(&v->gb, 1);
if (!mv_mode_bit) /* 1MV mode */
{
if (!v->skip_mb_plane[current_mb])
{
GET_MVDATA();
/* hybrid mv pred, 8.3.5.3.4 */
if (v->mv_mode == MV_PMODE_1MV ||
v->mv_mode == MV_PMODE_MIXED_MV)
hybrid_pred = get_bits(&v->gb, 1);
if (mb_is_intra && !mb_has_coeffs)
{
GET_MQUANT();
ac_pred = get_bits(&v->gb, 1);
}
else if (mb_has_coeffs)
{
if (mb_is_intra) ac_pred = get_bits(&v->gb, 1);
cbpcy = get_vlc2(&v->gb, v->cbpcy_vlc->table,
VC9_CBPCY_P_VLC_BITS, 2);
GET_MQUANT();
}
if (!v->ttmbf)
v->ttfrm = get_vlc2(&v->gb, v->ttmb_vlc->table,
VC9_TTMB_VLC_BITS, 12);
//Decode blocks from that mb wrt cbpcy
}
else //Skipped
{
/* hybrid mv pred, 8.3.5.3.4 */
if (v->mv_mode == MV_PMODE_1MV ||
v->mv_mode == MV_PMODE_MIXED_MV)
hybrid_pred = get_bits(&v->gb, 1);
}
} //1MV mode
else //4MV mode
{
if (!v->skip_mb_plane[current_mb] /* unskipped MB */)
{
cbpcy = get_vlc2(&v->gb, v->cbpcy_vlc->table,
VC9_CBPCY_P_VLC_BITS, 2);
for (i=0; i<4; i++) //For all 4 Y blocks
{
if (cbpcy & (1<<6) /* cbpcy set for this block */)
{
GET_MVDATA();
}
if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)
hybrid_pred = get_bits(&v->gb, 1);
GET_MQUANT();
if (mb_is_intra /* One of the 4 blocks is intra */ &&
index /* non-zero pred for that block */)
ac_pred = get_bits(&v->gb, 1);
if (!v->ttmbf)
tt_block = get_vlc2(&v->gb, v->ttmb_vlc->table,
VC9_TTMB_VLC_BITS, 12);
/* TODO: Process blocks wrt cbpcy */
/* Prepare cbpcy for next block */
cbpcy <<= 1;
}
}
else //Skipped MB
{
for (i=0; i<4; i++) //All 4 Y blocks
{
if (v->mv_mode == MV_PMODE_MIXED_MV /* Hybrid pred */)
hybrid_pred = get_bits(&v->gb, 1);
/* FIXME: do something */
}
}
}
}
current_mb++;
}
return 0;
}
static int decode_b_mbs(VC9Context *v)
{
int x, y, current_mb = 0 , last_mb = v->height_mb*v->width_mb,
i /* MB / B postion information */;
int direct_b_bit = 0, skip_mb_bit = 0;
int ac_pred;
int b_mv1 = 0, b_mv2 = 0, b_mv_type = 0;
int mquant, mqdiff; /* MB quant stuff */
int tt_block; /* Block transform type */
for (y=0; y<v->height_mb; y++)
{
for (x=0; x<v->width_mb; x++)
{
if (v->direct_mb_plane[current_mb])
direct_b_bit = get_bits(&v->gb, 1);
if (1 /* Skip mode is raw */)
{
/* FIXME getting tired commenting */
#if 0
skip_mb_bit = get_bits(&v->gb, n); //vlc
#endif
}
if (!direct_b_bit)
{
if (skip_mb_bit)
{
/* FIXME getting tired commenting */
#if 0
b_mv_type = get_bits(&v->gb, n); //vlc
#endif
}
else
{
/* FIXME getting tired commenting */
#if 0
b_mv1 = get_bits(&v->gb, n); //VLC
#endif
if (1 /* b_mv1 isn't intra */)
{
/* FIXME: actually read it */
b_mv_type = 0; //vlc
}
}
}
if (!skip_mb_bit)
{
if (b_mv1 != last_mb)
{
GET_MQUANT();
if (1 /* intra mb */)
ac_pred = get_bits(&v->gb, 1);
}
else
{
if (1 /* forward_mb is interpolate */)
{
/* FIXME: actually read it */
b_mv2 = 0; //vlc
}
if (1 /* b_mv2 isn't the last */)
{
if (1 /* intra_mb */)
ac_pred = get_bits(&v->gb, 1);
GET_MQUANT();
}
}
}
//End1
/* FIXME getting tired, commenting */
#if 0
if (v->ttmbf)
v->ttmb = get_bits(&v->gb, n); //vlc
#endif
}
//End2
for (i=0; i<6; i++)
{
/* FIXME: process the block */
}
current_mb++;
}
return 0;
}
#if HAS_ADVANCED_PROFILE
static int advanced_decode_i_mbs(VC9Context *v)
{
int i, x, y, cbpcy, mqdiff, absmq, mquant, ac_pred, condover,
current_mb = 0, over_flags_mb = 0;
for (y=0; y<v->height_mb; y++)
{
for (x=0; x<v->width_mb; x++)
{
if (v->ac_pred_plane[i])
ac_pred = get_bits(&v->gb, 1);
if (condover == 3 && v->over_flags_plane)
over_flags_mb = get_bits(&v->gb, 1);
GET_MQUANT();
}
current_mb++;
}
return 0;
}
#endif
static int vc9_decode_init(AVCodecContext *avctx)
{
VC9Context *v = avctx->priv_data;
GetBitContext gb;
if (!avctx->extradata_size || !avctx->extradata) return -1;
avctx->pix_fmt = PIX_FMT_YUV420P;
v->avctx = avctx;
if (init_common(v) < 0) return -1;
if (avctx->codec_id == CODEC_ID_WMV3)
{
int count = 0;
// looks like WMV3 has a sequence header stored in the extradata
// advanced sequence header may be before the first frame
// the last byte of the extradata is a version number, 1 for the
// samples we can decode
init_get_bits(&gb, avctx->extradata, avctx->extradata_size);
decode_sequence_header(avctx, &gb);
count = avctx->extradata_size*8 - get_bits_count(&gb);
if (count>0)
{
av_log(avctx, AV_LOG_INFO, "Extra data: %i bits left, value: %X\n",
count, get_bits(&gb, count));
}
else
{
av_log(avctx, AV_LOG_INFO, "Read %i bits in overflow\n", -count);
}
}
/* Done with header parsing */
//FIXME I feel like this is wrong
v->width_mb = (avctx->coded_width+15)>>4;
v->height_mb = (avctx->coded_height+15)>>4;
/* Allocate mb bitplanes */
v->mv_type_mb_plane = (uint8_t *)av_malloc(v->width_mb*v->height_mb);
if (!v->mv_type_mb_plane) return -1;
v->skip_mb_plane = (uint8_t *)av_malloc(v->width_mb*v->height_mb);
if (!v->skip_mb_plane) return -1;
v->direct_mb_plane = (uint8_t *)av_malloc(v->width_mb*v->height_mb);
if (!v->direct_mb_plane) return -1;
#if HAS_ADVANCED_PROFILE
if (v->profile > PROFILE_MAIN)
{
v->over_flags_plane = (uint8_t *)av_malloc(v->width_mb*v->height_mb);
if (!v->over_flags_plane) return -1;
v->ac_pred_plane = (uint8_t *)av_malloc(v->width_mb*v->height_mb);
if (!v->ac_pred_plane) return -1;
}
#endif
return 0;
}
static int vc9_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
VC9Context *v = avctx->priv_data;
int ret = FRAME_SKIPED, len, start_code;
AVFrame *pict = data;
uint8_t *tmp_buf;
v->avctx = avctx;
//buf_size = 0 -> last frame
if (!buf_size) return 0;
len = avpicture_get_size(avctx->pix_fmt, avctx->width,
avctx->height);
tmp_buf = (uint8_t *)av_mallocz(len);
avpicture_fill((AVPicture *)pict, tmp_buf, avctx->pix_fmt,
avctx->width, avctx->height);
if (avctx->codec_id == CODEC_ID_WMV3)
{
init_get_bits(&v->gb, buf, buf_size*8);
av_log(avctx, AV_LOG_INFO, "Frame: %i bits to decode\n", buf_size*8);
#if HAS_ADVANCED_PROFILE
if (v->profile > PROFILE_MAIN)
{
if (advanced_decode_picture_header(v) == FRAME_SKIPED) return buf_size;
switch(v->pict_type)
{
case I_TYPE: ret = advanced_decode_i_mbs(v); break;
case P_TYPE: ret = decode_p_mbs(v); break;
case B_TYPE:
case BI_TYPE: ret = decode_b_mbs(v); break;
default: ret = FRAME_SKIPED;
}
if (ret == FRAME_SKIPED) return buf_size; //We ignore for now failures
}
else
#endif
{
if (standard_decode_picture_header(v) == FRAME_SKIPED) return buf_size;
switch(v->pict_type)
{
case I_TYPE: ret = standard_decode_i_mbs(v); break;
case P_TYPE: ret = decode_p_mbs(v); break;
case B_TYPE:
case BI_TYPE: ret = decode_b_mbs(v); break;
default: ret = FRAME_SKIPED;
}
if (ret == FRAME_SKIPED) return buf_size;
}
/* Size of the output data = image */
av_log(avctx, AV_LOG_DEBUG, "Consumed %i/%i bits\n",
get_bits_count(&v->gb), buf_size*8);
}
else
{
#if 0
// search for IDU's
// FIXME
uint32_t scp = 0;
int scs = 0, i = 0;
while (i < buf_size)
{
for (; i < buf_size && scp != 0x000001; i++)
scp = ((scp<<8)|buf[i])&0xffffff;
if (scp != 0x000001)
break; // eof ?
scs = buf[i++];
init_get_bits(&v->gb, buf+i, (buf_size-i)*8);
switch(scs)
{
case 0xf:
decode_sequence_header(avctx, &v->gb);
break;
// to be finished
}
i += get_bits_count(&v->gb)*8;
}
#else
av_abort();
#endif
}
*data_size = len;
/* Fake consumption of all data */
return buf_size; //Number of bytes consumed
}
static int vc9_decode_end(AVCodecContext *avctx)
{
VC9Context *v = avctx->priv_data;
#if HAS_ADVANCED_PROFILE
if (v->hrd_rate) av_free(v->hrd_rate);
if (v->hrd_buffer) av_free(v->hrd_buffer);
#endif
if (v->mv_type_mb_plane) av_free(v->mv_type_mb_plane);
if (v->skip_mb_plane) av_free(v->skip_mb_plane);
if (v->direct_mb_plane) av_free(v->direct_mb_plane);
return 0;
}
AVCodec vc9_decoder = {
"vc9",
CODEC_TYPE_VIDEO,
CODEC_ID_VC9,
sizeof(VC9Context),
vc9_decode_init,
NULL,
vc9_decode_end,
vc9_decode_frame,
CODEC_CAP_DELAY,
NULL
};
AVCodec wmv3_decoder = {
"wmv3",
CODEC_TYPE_VIDEO,
CODEC_ID_WMV3,
sizeof(VC9Context),
vc9_decode_init,
NULL,
vc9_decode_end,
vc9_decode_frame,
CODEC_CAP_DELAY,
NULL
};
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