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ffmpeg-rockchip/libavcodec/vp3.c
Aurelien Jacobs da91ed594e use generic xiph header spliting func to split theora headers 
Original thread:
Date: Thu, 22 Mar 2007 20:23:08 -0400
Subject: [Ffmpeg-devel] [PATCH] Theora in MKV (GSoC '07 Qualification)

Originally committed as revision 8506 to svn://svn.ffmpeg.org/ffmpeg/trunk
2007-03-25 01:09:26 +00:00

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/*
* Copyright (C) 2003-2004 the ffmpeg project
*
* 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 vp3.c
* On2 VP3 Video Decoder
*
* VP3 Video Decoder by Mike Melanson (mike at multimedia.cx)
* For more information about the VP3 coding process, visit:
* http://multimedia.cx/
*
* Theora decoder by Alex Beregszaszi
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "vp3data.h"
#include "xiph.h"
#define FRAGMENT_PIXELS 8
/*
* Debugging Variables
*
* Define one or more of the following compile-time variables to 1 to obtain
* elaborate information about certain aspects of the decoding process.
*
* KEYFRAMES_ONLY: set this to 1 to only see keyframes (VP3 slideshow mode)
* DEBUG_VP3: high-level decoding flow
* DEBUG_INIT: initialization parameters
* DEBUG_DEQUANTIZERS: display how the dequanization tables are built
* DEBUG_BLOCK_CODING: unpacking the superblock/macroblock/fragment coding
* DEBUG_MODES: unpacking the coding modes for individual fragments
* DEBUG_VECTORS: display the motion vectors
* DEBUG_TOKEN: display exhaustive information about each DCT token
* DEBUG_VLC: display the VLCs as they are extracted from the stream
* DEBUG_DC_PRED: display the process of reversing DC prediction
* DEBUG_IDCT: show every detail of the IDCT process
*/
#define KEYFRAMES_ONLY 0
#define DEBUG_VP3 0
#define DEBUG_INIT 0
#define DEBUG_DEQUANTIZERS 0
#define DEBUG_BLOCK_CODING 0
#define DEBUG_MODES 0
#define DEBUG_VECTORS 0
#define DEBUG_TOKEN 0
#define DEBUG_VLC 0
#define DEBUG_DC_PRED 0
#define DEBUG_IDCT 0
#if DEBUG_VP3
#define debug_vp3(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_vp3(const char *format, ...) { }
#endif
#if DEBUG_INIT
#define debug_init(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_init(const char *format, ...) { }
#endif
#if DEBUG_DEQUANTIZERS
#define debug_dequantizers(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_dequantizers(const char *format, ...) { }
#endif
#if DEBUG_BLOCK_CODING
#define debug_block_coding(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_block_coding(const char *format, ...) { }
#endif
#if DEBUG_MODES
#define debug_modes(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_modes(const char *format, ...) { }
#endif
#if DEBUG_VECTORS
#define debug_vectors(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_vectors(const char *format, ...) { }
#endif
#if DEBUG_TOKEN
#define debug_token(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_token(const char *format, ...) { }
#endif
#if DEBUG_VLC
#define debug_vlc(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_vlc(const char *format, ...) { }
#endif
#if DEBUG_DC_PRED
#define debug_dc_pred(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_dc_pred(const char *format, ...) { }
#endif
#if DEBUG_IDCT
#define debug_idct(args...) av_log(NULL, AV_LOG_DEBUG, ## args)
#else
static inline void debug_idct(const char *format, ...) { }
#endif
typedef struct Coeff {
struct Coeff *next;
DCTELEM coeff;
uint8_t index;
} Coeff;
//FIXME split things out into their own arrays
typedef struct Vp3Fragment {
Coeff *next_coeff;
/* address of first pixel taking into account which plane the fragment
* lives on as well as the plane stride */
int first_pixel;
/* this is the macroblock that the fragment belongs to */
uint16_t macroblock;
uint8_t coding_method;
uint8_t coeff_count;
int8_t motion_x;
int8_t motion_y;
} Vp3Fragment;
#define SB_NOT_CODED 0
#define SB_PARTIALLY_CODED 1
#define SB_FULLY_CODED 2
#define MODE_INTER_NO_MV 0
#define MODE_INTRA 1
#define MODE_INTER_PLUS_MV 2
#define MODE_INTER_LAST_MV 3
#define MODE_INTER_PRIOR_LAST 4
#define MODE_USING_GOLDEN 5
#define MODE_GOLDEN_MV 6
#define MODE_INTER_FOURMV 7
#define CODING_MODE_COUNT 8
/* special internal mode */
#define MODE_COPY 8
/* There are 6 preset schemes, plus a free-form scheme */
static int ModeAlphabet[7][CODING_MODE_COUNT] =
{
/* this is the custom scheme */
{ 0, 0, 0, 0, 0, 0, 0, 0 },
/* scheme 1: Last motion vector dominates */
{ MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
MODE_INTER_PLUS_MV, MODE_INTER_NO_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 2 */
{ MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
MODE_INTER_NO_MV, MODE_INTER_PLUS_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 3 */
{ MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV,
MODE_INTER_PRIOR_LAST, MODE_INTER_NO_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 4 */
{ MODE_INTER_LAST_MV, MODE_INTER_PLUS_MV,
MODE_INTER_NO_MV, MODE_INTER_PRIOR_LAST,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 5: No motion vector dominates */
{ MODE_INTER_NO_MV, MODE_INTER_LAST_MV,
MODE_INTER_PRIOR_LAST, MODE_INTER_PLUS_MV,
MODE_INTRA, MODE_USING_GOLDEN,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
/* scheme 6 */
{ MODE_INTER_NO_MV, MODE_USING_GOLDEN,
MODE_INTER_LAST_MV, MODE_INTER_PRIOR_LAST,
MODE_INTER_PLUS_MV, MODE_INTRA,
MODE_GOLDEN_MV, MODE_INTER_FOURMV },
};
#define MIN_DEQUANT_VAL 2
typedef struct Vp3DecodeContext {
AVCodecContext *avctx;
int theora, theora_tables;
int version;
int width, height;
AVFrame golden_frame;
AVFrame last_frame;
AVFrame current_frame;
int keyframe;
DSPContext dsp;
int flipped_image;
int qis[3];
int nqis;
int quality_index;
int last_quality_index;
int superblock_count;
int superblock_width;
int superblock_height;
int y_superblock_width;
int y_superblock_height;
int c_superblock_width;
int c_superblock_height;
int u_superblock_start;
int v_superblock_start;
unsigned char *superblock_coding;
int macroblock_count;
int macroblock_width;
int macroblock_height;
int fragment_count;
int fragment_width;
int fragment_height;
Vp3Fragment *all_fragments;
Coeff *coeffs;
Coeff *next_coeff;
int fragment_start[3];
ScanTable scantable;
/* tables */
uint16_t coded_dc_scale_factor[64];
uint32_t coded_ac_scale_factor[64];
uint8_t base_matrix[384][64];
uint8_t qr_count[2][3];
uint8_t qr_size [2][3][64];
uint16_t qr_base[2][3][64];
/* this is a list of indices into the all_fragments array indicating
* which of the fragments are coded */
int *coded_fragment_list;
int coded_fragment_list_index;
int pixel_addresses_inited;
VLC dc_vlc[16];
VLC ac_vlc_1[16];
VLC ac_vlc_2[16];
VLC ac_vlc_3[16];
VLC ac_vlc_4[16];
VLC superblock_run_length_vlc;
VLC fragment_run_length_vlc;
VLC mode_code_vlc;
VLC motion_vector_vlc;
/* these arrays need to be on 16-byte boundaries since SSE2 operations
* index into them */
DECLARE_ALIGNED_16(int16_t, qmat[2][4][64]); //<qmat[is_inter][plane]
/* This table contains superblock_count * 16 entries. Each set of 16
* numbers corresponds to the fragment indices 0..15 of the superblock.
* An entry will be -1 to indicate that no entry corresponds to that
* index. */
int *superblock_fragments;
/* This table contains superblock_count * 4 entries. Each set of 4
* numbers corresponds to the macroblock indices 0..3 of the superblock.
* An entry will be -1 to indicate that no entry corresponds to that
* index. */
int *superblock_macroblocks;
/* This table contains macroblock_count * 6 entries. Each set of 6
* numbers corresponds to the fragment indices 0..5 which comprise
* the macroblock (4 Y fragments and 2 C fragments). */
int *macroblock_fragments;
/* This is an array that indicates how a particular macroblock
* is coded. */
unsigned char *macroblock_coding;
int first_coded_y_fragment;
int first_coded_c_fragment;
int last_coded_y_fragment;
int last_coded_c_fragment;
uint8_t edge_emu_buffer[9*2048]; //FIXME dynamic alloc
int8_t qscale_table[2048]; //FIXME dynamic alloc (width+15)/16
/* Huffman decode */
int hti;
unsigned int hbits;
int entries;
int huff_code_size;
uint16_t huffman_table[80][32][2];
uint32_t filter_limit_values[64];
int bounding_values_array[256];
} Vp3DecodeContext;
static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb);
/************************************************************************
* VP3 specific functions
************************************************************************/
/*
* This function sets up all of the various blocks mappings:
* superblocks <-> fragments, macroblocks <-> fragments,
* superblocks <-> macroblocks
*
* Returns 0 is successful; returns 1 if *anything* went wrong.
*/
static int init_block_mapping(Vp3DecodeContext *s)
{
int i, j;
signed int hilbert_walk_mb[4];
int current_fragment = 0;
int current_width = 0;
int current_height = 0;
int right_edge = 0;
int bottom_edge = 0;
int superblock_row_inc = 0;
int *hilbert = NULL;
int mapping_index = 0;
int current_macroblock;
int c_fragment;
signed char travel_width[16] = {
1, 1, 0, -1,
0, 0, 1, 0,
1, 0, 1, 0,
0, -1, 0, 1
};
signed char travel_height[16] = {
0, 0, 1, 0,
1, 1, 0, -1,
0, 1, 0, -1,
-1, 0, -1, 0
};
signed char travel_width_mb[4] = {
1, 0, 1, 0
};
signed char travel_height_mb[4] = {
0, 1, 0, -1
};
debug_vp3(" vp3: initialize block mapping tables\n");
hilbert_walk_mb[0] = 1;
hilbert_walk_mb[1] = s->macroblock_width;
hilbert_walk_mb[2] = 1;
hilbert_walk_mb[3] = -s->macroblock_width;
/* iterate through each superblock (all planes) and map the fragments */
for (i = 0; i < s->superblock_count; i++) {
debug_init(" superblock %d (u starts @ %d, v starts @ %d)\n",
i, s->u_superblock_start, s->v_superblock_start);
/* time to re-assign the limits? */
if (i == 0) {
/* start of Y superblocks */
right_edge = s->fragment_width;
bottom_edge = s->fragment_height;
current_width = -1;
current_height = 0;
superblock_row_inc = 3 * s->fragment_width -
(s->y_superblock_width * 4 - s->fragment_width);
/* the first operation for this variable is to advance by 1 */
current_fragment = -1;
} else if (i == s->u_superblock_start) {
/* start of U superblocks */
right_edge = s->fragment_width / 2;
bottom_edge = s->fragment_height / 2;
current_width = -1;
current_height = 0;
superblock_row_inc = 3 * (s->fragment_width / 2) -
(s->c_superblock_width * 4 - s->fragment_width / 2);
/* the first operation for this variable is to advance by 1 */
current_fragment = s->fragment_start[1] - 1;
} else if (i == s->v_superblock_start) {
/* start of V superblocks */
right_edge = s->fragment_width / 2;
bottom_edge = s->fragment_height / 2;
current_width = -1;
current_height = 0;
superblock_row_inc = 3 * (s->fragment_width / 2) -
(s->c_superblock_width * 4 - s->fragment_width / 2);
/* the first operation for this variable is to advance by 1 */
current_fragment = s->fragment_start[2] - 1;
}
if (current_width >= right_edge - 1) {
/* reset width and move to next superblock row */
current_width = -1;
current_height += 4;
/* fragment is now at the start of a new superblock row */
current_fragment += superblock_row_inc;
}
/* iterate through all 16 fragments in a superblock */
for (j = 0; j < 16; j++) {
current_fragment += travel_width[j] + right_edge * travel_height[j];
current_width += travel_width[j];
current_height += travel_height[j];
/* check if the fragment is in bounds */
if ((current_width < right_edge) &&
(current_height < bottom_edge)) {
s->superblock_fragments[mapping_index] = current_fragment;
debug_init(" mapping fragment %d to superblock %d, position %d (%d/%d x %d/%d)\n",
s->superblock_fragments[mapping_index], i, j,
current_width, right_edge, current_height, bottom_edge);
} else {
s->superblock_fragments[mapping_index] = -1;
debug_init(" superblock %d, position %d has no fragment (%d/%d x %d/%d)\n",
i, j,
current_width, right_edge, current_height, bottom_edge);
}
mapping_index++;
}
}
/* initialize the superblock <-> macroblock mapping; iterate through
* all of the Y plane superblocks to build this mapping */
right_edge = s->macroblock_width;
bottom_edge = s->macroblock_height;
current_width = -1;
current_height = 0;
superblock_row_inc = s->macroblock_width -
(s->y_superblock_width * 2 - s->macroblock_width);;
hilbert = hilbert_walk_mb;
mapping_index = 0;
current_macroblock = -1;
for (i = 0; i < s->u_superblock_start; i++) {
if (current_width >= right_edge - 1) {
/* reset width and move to next superblock row */
current_width = -1;
current_height += 2;
/* macroblock is now at the start of a new superblock row */
current_macroblock += superblock_row_inc;
}
/* iterate through each potential macroblock in the superblock */
for (j = 0; j < 4; j++) {
current_macroblock += hilbert_walk_mb[j];
current_width += travel_width_mb[j];
current_height += travel_height_mb[j];
/* check if the macroblock is in bounds */
if ((current_width < right_edge) &&
(current_height < bottom_edge)) {
s->superblock_macroblocks[mapping_index] = current_macroblock;
debug_init(" mapping macroblock %d to superblock %d, position %d (%d/%d x %d/%d)\n",
s->superblock_macroblocks[mapping_index], i, j,
current_width, right_edge, current_height, bottom_edge);
} else {
s->superblock_macroblocks[mapping_index] = -1;
debug_init(" superblock %d, position %d has no macroblock (%d/%d x %d/%d)\n",
i, j,
current_width, right_edge, current_height, bottom_edge);
}
mapping_index++;
}
}
/* initialize the macroblock <-> fragment mapping */
current_fragment = 0;
current_macroblock = 0;
mapping_index = 0;
for (i = 0; i < s->fragment_height; i += 2) {
for (j = 0; j < s->fragment_width; j += 2) {
debug_init(" macroblock %d contains fragments: ", current_macroblock);
s->all_fragments[current_fragment].macroblock = current_macroblock;
s->macroblock_fragments[mapping_index++] = current_fragment;
debug_init("%d ", current_fragment);
if (j + 1 < s->fragment_width) {
s->all_fragments[current_fragment + 1].macroblock = current_macroblock;
s->macroblock_fragments[mapping_index++] = current_fragment + 1;
debug_init("%d ", current_fragment + 1);
} else
s->macroblock_fragments[mapping_index++] = -1;
if (i + 1 < s->fragment_height) {
s->all_fragments[current_fragment + s->fragment_width].macroblock =
current_macroblock;
s->macroblock_fragments[mapping_index++] =
current_fragment + s->fragment_width;
debug_init("%d ", current_fragment + s->fragment_width);
} else
s->macroblock_fragments[mapping_index++] = -1;
if ((j + 1 < s->fragment_width) && (i + 1 < s->fragment_height)) {
s->all_fragments[current_fragment + s->fragment_width + 1].macroblock =
current_macroblock;
s->macroblock_fragments[mapping_index++] =
current_fragment + s->fragment_width + 1;
debug_init("%d ", current_fragment + s->fragment_width + 1);
} else
s->macroblock_fragments[mapping_index++] = -1;
/* C planes */
c_fragment = s->fragment_start[1] +
(i * s->fragment_width / 4) + (j / 2);
s->all_fragments[c_fragment].macroblock = s->macroblock_count;
s->macroblock_fragments[mapping_index++] = c_fragment;
debug_init("%d ", c_fragment);
c_fragment = s->fragment_start[2] +
(i * s->fragment_width / 4) + (j / 2);
s->all_fragments[c_fragment].macroblock = s->macroblock_count;
s->macroblock_fragments[mapping_index++] = c_fragment;
debug_init("%d ", c_fragment);
debug_init("\n");
if (j + 2 <= s->fragment_width)
current_fragment += 2;
else
current_fragment++;
current_macroblock++;
}
current_fragment += s->fragment_width;
}
return 0; /* successful path out */
}
/*
* This function wipes out all of the fragment data.
*/
static void init_frame(Vp3DecodeContext *s, GetBitContext *gb)
{
int i;
/* zero out all of the fragment information */
s->coded_fragment_list_index = 0;
for (i = 0; i < s->fragment_count; i++) {
s->all_fragments[i].coeff_count = 0;
s->all_fragments[i].motion_x = 127;
s->all_fragments[i].motion_y = 127;
s->all_fragments[i].next_coeff= NULL;
s->coeffs[i].index=
s->coeffs[i].coeff=0;
s->coeffs[i].next= NULL;
}
}
/*
* This function sets up the dequantization tables used for a particular
* frame.
*/
static void init_dequantizer(Vp3DecodeContext *s)
{
int ac_scale_factor = s->coded_ac_scale_factor[s->quality_index];
int dc_scale_factor = s->coded_dc_scale_factor[s->quality_index];
int i, plane, inter, qri, bmi, bmj, qistart;
debug_vp3(" vp3: initializing dequantization tables\n");
for(inter=0; inter<2; inter++){
for(plane=0; plane<3; plane++){
int sum=0;
for(qri=0; qri<s->qr_count[inter][plane]; qri++){
sum+= s->qr_size[inter][plane][qri];
if(s->quality_index <= sum)
break;
}
qistart= sum - s->qr_size[inter][plane][qri];
bmi= s->qr_base[inter][plane][qri ];
bmj= s->qr_base[inter][plane][qri+1];
for(i=0; i<64; i++){
int coeff= ( 2*(sum -s->quality_index)*s->base_matrix[bmi][i]
- 2*(qistart-s->quality_index)*s->base_matrix[bmj][i]
+ s->qr_size[inter][plane][qri])
/ (2*s->qr_size[inter][plane][qri]);
int qmin= 8<<(inter + !i);
int qscale= i ? ac_scale_factor : dc_scale_factor;
s->qmat[inter][plane][i]= av_clip((qscale * coeff)/100 * 4, qmin, 4096);
}
}
}
memset(s->qscale_table, (FFMAX(s->qmat[0][0][1], s->qmat[0][1][1])+8)/16, 512); //FIXME finetune
}
/*
* This function initializes the loop filter boundary limits if the frame's
* quality index is different from the previous frame's.
*/
static void init_loop_filter(Vp3DecodeContext *s)
{
int *bounding_values= s->bounding_values_array+127;
int filter_limit;
int x;
filter_limit = s->filter_limit_values[s->quality_index];
/* set up the bounding values */
memset(s->bounding_values_array, 0, 256 * sizeof(int));
for (x = 0; x < filter_limit; x++) {
bounding_values[-x - filter_limit] = -filter_limit + x;
bounding_values[-x] = -x;
bounding_values[x] = x;
bounding_values[x + filter_limit] = filter_limit - x;
}
}
/*
* This function unpacks all of the superblock/macroblock/fragment coding
* information from the bitstream.
*/
static int unpack_superblocks(Vp3DecodeContext *s, GetBitContext *gb)
{
int bit = 0;
int current_superblock = 0;
int current_run = 0;
int decode_fully_flags = 0;
int decode_partial_blocks = 0;
int first_c_fragment_seen;
int i, j;
int current_fragment;
debug_vp3(" vp3: unpacking superblock coding\n");
if (s->keyframe) {
debug_vp3(" keyframe-- all superblocks are fully coded\n");
memset(s->superblock_coding, SB_FULLY_CODED, s->superblock_count);
} else {
/* unpack the list of partially-coded superblocks */
bit = get_bits(gb, 1);
/* toggle the bit because as soon as the first run length is
* fetched the bit will be toggled again */
bit ^= 1;
while (current_superblock < s->superblock_count) {
if (current_run-- == 0) {
bit ^= 1;
current_run = get_vlc2(gb,
s->superblock_run_length_vlc.table, 6, 2);
if (current_run == 33)
current_run += get_bits(gb, 12);
debug_block_coding(" setting superblocks %d..%d to %s\n",
current_superblock,
current_superblock + current_run - 1,
(bit) ? "partially coded" : "not coded");
/* if any of the superblocks are not partially coded, flag
* a boolean to decode the list of fully-coded superblocks */
if (bit == 0) {
decode_fully_flags = 1;
} else {
/* make a note of the fact that there are partially coded
* superblocks */
decode_partial_blocks = 1;
}
}
s->superblock_coding[current_superblock++] = bit;
}
/* unpack the list of fully coded superblocks if any of the blocks were
* not marked as partially coded in the previous step */
if (decode_fully_flags) {
current_superblock = 0;
current_run = 0;
bit = get_bits(gb, 1);
/* toggle the bit because as soon as the first run length is
* fetched the bit will be toggled again */
bit ^= 1;
while (current_superblock < s->superblock_count) {
/* skip any superblocks already marked as partially coded */
if (s->superblock_coding[current_superblock] == SB_NOT_CODED) {
if (current_run-- == 0) {
bit ^= 1;
current_run = get_vlc2(gb,
s->superblock_run_length_vlc.table, 6, 2);
if (current_run == 33)
current_run += get_bits(gb, 12);
}
debug_block_coding(" setting superblock %d to %s\n",
current_superblock,
(bit) ? "fully coded" : "not coded");
s->superblock_coding[current_superblock] = 2*bit;
}
current_superblock++;
}
}
/* if there were partial blocks, initialize bitstream for
* unpacking fragment codings */
if (decode_partial_blocks) {
current_run = 0;
bit = get_bits(gb, 1);
/* toggle the bit because as soon as the first run length is
* fetched the bit will be toggled again */
bit ^= 1;
}
}
/* figure out which fragments are coded; iterate through each
* superblock (all planes) */
s->coded_fragment_list_index = 0;
s->next_coeff= s->coeffs + s->fragment_count;
s->first_coded_y_fragment = s->first_coded_c_fragment = 0;
s->last_coded_y_fragment = s->last_coded_c_fragment = -1;
first_c_fragment_seen = 0;
memset(s->macroblock_coding, MODE_COPY, s->macroblock_count);
for (i = 0; i < s->superblock_count; i++) {
/* iterate through all 16 fragments in a superblock */
for (j = 0; j < 16; j++) {
/* if the fragment is in bounds, check its coding status */
current_fragment = s->superblock_fragments[i * 16 + j];
if (current_fragment >= s->fragment_count) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_superblocks(): bad fragment number (%d >= %d)\n",
current_fragment, s->fragment_count);
return 1;
}
if (current_fragment != -1) {
if (s->superblock_coding[i] == SB_NOT_CODED) {
/* copy all the fragments from the prior frame */
s->all_fragments[current_fragment].coding_method =
MODE_COPY;
} else if (s->superblock_coding[i] == SB_PARTIALLY_CODED) {
/* fragment may or may not be coded; this is the case
* that cares about the fragment coding runs */
if (current_run-- == 0) {
bit ^= 1;
current_run = get_vlc2(gb,
s->fragment_run_length_vlc.table, 5, 2);
}
if (bit) {
/* default mode; actual mode will be decoded in
* the next phase */
s->all_fragments[current_fragment].coding_method =
MODE_INTER_NO_MV;
s->all_fragments[current_fragment].next_coeff= s->coeffs + current_fragment;
s->coded_fragment_list[s->coded_fragment_list_index] =
current_fragment;
if ((current_fragment >= s->fragment_start[1]) &&
(s->last_coded_y_fragment == -1) &&
(!first_c_fragment_seen)) {
s->first_coded_c_fragment = s->coded_fragment_list_index;
s->last_coded_y_fragment = s->first_coded_c_fragment - 1;
first_c_fragment_seen = 1;
}
s->coded_fragment_list_index++;
s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV;
debug_block_coding(" superblock %d is partially coded, fragment %d is coded\n",
i, current_fragment);
} else {
/* not coded; copy this fragment from the prior frame */
s->all_fragments[current_fragment].coding_method =
MODE_COPY;
debug_block_coding(" superblock %d is partially coded, fragment %d is not coded\n",
i, current_fragment);
}
} else {
/* fragments are fully coded in this superblock; actual
* coding will be determined in next step */
s->all_fragments[current_fragment].coding_method =
MODE_INTER_NO_MV;
s->all_fragments[current_fragment].next_coeff= s->coeffs + current_fragment;
s->coded_fragment_list[s->coded_fragment_list_index] =
current_fragment;
if ((current_fragment >= s->fragment_start[1]) &&
(s->last_coded_y_fragment == -1) &&
(!first_c_fragment_seen)) {
s->first_coded_c_fragment = s->coded_fragment_list_index;
s->last_coded_y_fragment = s->first_coded_c_fragment - 1;
first_c_fragment_seen = 1;
}
s->coded_fragment_list_index++;
s->macroblock_coding[s->all_fragments[current_fragment].macroblock] = MODE_INTER_NO_MV;
debug_block_coding(" superblock %d is fully coded, fragment %d is coded\n",
i, current_fragment);
}
}
}
}
if (!first_c_fragment_seen)
/* only Y fragments coded in this frame */
s->last_coded_y_fragment = s->coded_fragment_list_index - 1;
else
/* end the list of coded C fragments */
s->last_coded_c_fragment = s->coded_fragment_list_index - 1;
debug_block_coding(" %d total coded fragments, y: %d -> %d, c: %d -> %d\n",
s->coded_fragment_list_index,
s->first_coded_y_fragment,
s->last_coded_y_fragment,
s->first_coded_c_fragment,
s->last_coded_c_fragment);
return 0;
}
/*
* This function unpacks all the coding mode data for individual macroblocks
* from the bitstream.
*/
static int unpack_modes(Vp3DecodeContext *s, GetBitContext *gb)
{
int i, j, k;
int scheme;
int current_macroblock;
int current_fragment;
int coding_mode;
debug_vp3(" vp3: unpacking encoding modes\n");
if (s->keyframe) {
debug_vp3(" keyframe-- all blocks are coded as INTRA\n");
for (i = 0; i < s->fragment_count; i++)
s->all_fragments[i].coding_method = MODE_INTRA;
} else {
/* fetch the mode coding scheme for this frame */
scheme = get_bits(gb, 3);
debug_modes(" using mode alphabet %d\n", scheme);
/* is it a custom coding scheme? */
if (scheme == 0) {
debug_modes(" custom mode alphabet ahead:\n");
for (i = 0; i < 8; i++)
ModeAlphabet[scheme][get_bits(gb, 3)] = i;
}
for (i = 0; i < 8; i++)
debug_modes(" mode[%d][%d] = %d\n", scheme, i,
ModeAlphabet[scheme][i]);
/* iterate through all of the macroblocks that contain 1 or more
* coded fragments */
for (i = 0; i < s->u_superblock_start; i++) {
for (j = 0; j < 4; j++) {
current_macroblock = s->superblock_macroblocks[i * 4 + j];
if ((current_macroblock == -1) ||
(s->macroblock_coding[current_macroblock] == MODE_COPY))
continue;
if (current_macroblock >= s->macroblock_count) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_modes(): bad macroblock number (%d >= %d)\n",
current_macroblock, s->macroblock_count);
return 1;
}
/* mode 7 means get 3 bits for each coding mode */
if (scheme == 7)
coding_mode = get_bits(gb, 3);
else
coding_mode = ModeAlphabet[scheme]
[get_vlc2(gb, s->mode_code_vlc.table, 3, 3)];
s->macroblock_coding[current_macroblock] = coding_mode;
for (k = 0; k < 6; k++) {
current_fragment =
s->macroblock_fragments[current_macroblock * 6 + k];
if (current_fragment == -1)
continue;
if (current_fragment >= s->fragment_count) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_modes(): bad fragment number (%d >= %d)\n",
current_fragment, s->fragment_count);
return 1;
}
if (s->all_fragments[current_fragment].coding_method !=
MODE_COPY)
s->all_fragments[current_fragment].coding_method =
coding_mode;
}
debug_modes(" coding method for macroblock starting @ fragment %d = %d\n",
s->macroblock_fragments[current_macroblock * 6], coding_mode);
}
}
}
return 0;
}
/*
* This function unpacks all the motion vectors for the individual
* macroblocks from the bitstream.
*/
static int unpack_vectors(Vp3DecodeContext *s, GetBitContext *gb)
{
int i, j, k;
int coding_mode;
int motion_x[6];
int motion_y[6];
int last_motion_x = 0;
int last_motion_y = 0;
int prior_last_motion_x = 0;
int prior_last_motion_y = 0;
int current_macroblock;
int current_fragment;
debug_vp3(" vp3: unpacking motion vectors\n");
if (s->keyframe) {
debug_vp3(" keyframe-- there are no motion vectors\n");
} else {
memset(motion_x, 0, 6 * sizeof(int));
memset(motion_y, 0, 6 * sizeof(int));
/* coding mode 0 is the VLC scheme; 1 is the fixed code scheme */
coding_mode = get_bits(gb, 1);
debug_vectors(" using %s scheme for unpacking motion vectors\n",
(coding_mode == 0) ? "VLC" : "fixed-length");
/* iterate through all of the macroblocks that contain 1 or more
* coded fragments */
for (i = 0; i < s->u_superblock_start; i++) {
for (j = 0; j < 4; j++) {
current_macroblock = s->superblock_macroblocks[i * 4 + j];
if ((current_macroblock == -1) ||
(s->macroblock_coding[current_macroblock] == MODE_COPY))
continue;
if (current_macroblock >= s->macroblock_count) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_vectors(): bad macroblock number (%d >= %d)\n",
current_macroblock, s->macroblock_count);
return 1;
}
current_fragment = s->macroblock_fragments[current_macroblock * 6];
if (current_fragment >= s->fragment_count) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_vectors(): bad fragment number (%d >= %d\n",
current_fragment, s->fragment_count);
return 1;
}
switch (s->macroblock_coding[current_macroblock]) {
case MODE_INTER_PLUS_MV:
case MODE_GOLDEN_MV:
/* all 6 fragments use the same motion vector */
if (coding_mode == 0) {
motion_x[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
motion_y[0] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
} else {
motion_x[0] = fixed_motion_vector_table[get_bits(gb, 6)];
motion_y[0] = fixed_motion_vector_table[get_bits(gb, 6)];
}
for (k = 1; k < 6; k++) {
motion_x[k] = motion_x[0];
motion_y[k] = motion_y[0];
}
/* vector maintenance, only on MODE_INTER_PLUS_MV */
if (s->macroblock_coding[current_macroblock] ==
MODE_INTER_PLUS_MV) {
prior_last_motion_x = last_motion_x;
prior_last_motion_y = last_motion_y;
last_motion_x = motion_x[0];
last_motion_y = motion_y[0];
}
break;
case MODE_INTER_FOURMV:
/* fetch 4 vectors from the bitstream, one for each
* Y fragment, then average for the C fragment vectors */
motion_x[4] = motion_y[4] = 0;
for (k = 0; k < 4; k++) {
if (coding_mode == 0) {
motion_x[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
motion_y[k] = motion_vector_table[get_vlc2(gb, s->motion_vector_vlc.table, 6, 2)];
} else {
motion_x[k] = fixed_motion_vector_table[get_bits(gb, 6)];
motion_y[k] = fixed_motion_vector_table[get_bits(gb, 6)];
}
motion_x[4] += motion_x[k];
motion_y[4] += motion_y[k];
}
motion_x[5]=
motion_x[4]= RSHIFT(motion_x[4], 2);
motion_y[5]=
motion_y[4]= RSHIFT(motion_y[4], 2);
/* vector maintenance; vector[3] is treated as the
* last vector in this case */
prior_last_motion_x = last_motion_x;
prior_last_motion_y = last_motion_y;
last_motion_x = motion_x[3];
last_motion_y = motion_y[3];
break;
case MODE_INTER_LAST_MV:
/* all 6 fragments use the last motion vector */
motion_x[0] = last_motion_x;
motion_y[0] = last_motion_y;
for (k = 1; k < 6; k++) {
motion_x[k] = motion_x[0];
motion_y[k] = motion_y[0];
}
/* no vector maintenance (last vector remains the
* last vector) */
break;
case MODE_INTER_PRIOR_LAST:
/* all 6 fragments use the motion vector prior to the
* last motion vector */
motion_x[0] = prior_last_motion_x;
motion_y[0] = prior_last_motion_y;
for (k = 1; k < 6; k++) {
motion_x[k] = motion_x[0];
motion_y[k] = motion_y[0];
}
/* vector maintenance */
prior_last_motion_x = last_motion_x;
prior_last_motion_y = last_motion_y;
last_motion_x = motion_x[0];
last_motion_y = motion_y[0];
break;
default:
/* covers intra, inter without MV, golden without MV */
memset(motion_x, 0, 6 * sizeof(int));
memset(motion_y, 0, 6 * sizeof(int));
/* no vector maintenance */
break;
}
/* assign the motion vectors to the correct fragments */
debug_vectors(" vectors for macroblock starting @ fragment %d (coding method %d):\n",
current_fragment,
s->macroblock_coding[current_macroblock]);
for (k = 0; k < 6; k++) {
current_fragment =
s->macroblock_fragments[current_macroblock * 6 + k];
if (current_fragment == -1)
continue;
if (current_fragment >= s->fragment_count) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_vectors(): bad fragment number (%d >= %d)\n",
current_fragment, s->fragment_count);
return 1;
}
s->all_fragments[current_fragment].motion_x = motion_x[k];
s->all_fragments[current_fragment].motion_y = motion_y[k];
debug_vectors(" vector %d: fragment %d = (%d, %d)\n",
k, current_fragment, motion_x[k], motion_y[k]);
}
}
}
}
return 0;
}
/*
* This function is called by unpack_dct_coeffs() to extract the VLCs from
* the bitstream. The VLCs encode tokens which are used to unpack DCT
* data. This function unpacks all the VLCs for either the Y plane or both
* C planes, and is called for DC coefficients or different AC coefficient
* levels (since different coefficient types require different VLC tables.
*
* This function returns a residual eob run. E.g, if a particular token gave
* instructions to EOB the next 5 fragments and there were only 2 fragments
* left in the current fragment range, 3 would be returned so that it could
* be passed into the next call to this same function.
*/
static int unpack_vlcs(Vp3DecodeContext *s, GetBitContext *gb,
VLC *table, int coeff_index,
int first_fragment, int last_fragment,
int eob_run)
{
int i;
int token;
int zero_run = 0;
DCTELEM coeff = 0;
Vp3Fragment *fragment;
uint8_t *perm= s->scantable.permutated;
int bits_to_get;
if ((first_fragment >= s->fragment_count) ||
(last_fragment >= s->fragment_count)) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:unpack_vlcs(): bad fragment number (%d -> %d ?)\n",
first_fragment, last_fragment);
return 0;
}
for (i = first_fragment; i <= last_fragment; i++) {
fragment = &s->all_fragments[s->coded_fragment_list[i]];
if (fragment->coeff_count > coeff_index)
continue;
if (!eob_run) {
/* decode a VLC into a token */
token = get_vlc2(gb, table->table, 5, 3);
debug_vlc(" token = %2d, ", token);
/* use the token to get a zero run, a coefficient, and an eob run */
if (token <= 6) {
eob_run = eob_run_base[token];
if (eob_run_get_bits[token])
eob_run += get_bits(gb, eob_run_get_bits[token]);
coeff = zero_run = 0;
} else {
bits_to_get = coeff_get_bits[token];
if (!bits_to_get)
coeff = coeff_tables[token][0];
else
coeff = coeff_tables[token][get_bits(gb, bits_to_get)];
zero_run = zero_run_base[token];
if (zero_run_get_bits[token])
zero_run += get_bits(gb, zero_run_get_bits[token]);
}
}
if (!eob_run) {
fragment->coeff_count += zero_run;
if (fragment->coeff_count < 64){
fragment->next_coeff->coeff= coeff;
fragment->next_coeff->index= perm[fragment->coeff_count++]; //FIXME perm here already?
fragment->next_coeff->next= s->next_coeff;
s->next_coeff->next=NULL;
fragment->next_coeff= s->next_coeff++;
}
debug_vlc(" fragment %d coeff = %d\n",
s->coded_fragment_list[i], fragment->next_coeff[coeff_index]);
} else {
fragment->coeff_count |= 128;
debug_vlc(" fragment %d eob with %d coefficients\n",
s->coded_fragment_list[i], fragment->coeff_count&127);
eob_run--;
}
}
return eob_run;
}
/*
* This function unpacks all of the DCT coefficient data from the
* bitstream.
*/
static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
{
int i;
int dc_y_table;
int dc_c_table;
int ac_y_table;
int ac_c_table;
int residual_eob_run = 0;
/* fetch the DC table indices */
dc_y_table = get_bits(gb, 4);
dc_c_table = get_bits(gb, 4);
/* unpack the Y plane DC coefficients */
debug_vp3(" vp3: unpacking Y plane DC coefficients using table %d\n",
dc_y_table);
residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_y_table], 0,
s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
/* unpack the C plane DC coefficients */
debug_vp3(" vp3: unpacking C plane DC coefficients using table %d\n",
dc_c_table);
residual_eob_run = unpack_vlcs(s, gb, &s->dc_vlc[dc_c_table], 0,
s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
/* fetch the AC table indices */
ac_y_table = get_bits(gb, 4);
ac_c_table = get_bits(gb, 4);
/* unpack the group 1 AC coefficients (coeffs 1-5) */
for (i = 1; i <= 5; i++) {
debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n",
i, ac_y_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_1[ac_y_table], i,
s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n",
i, ac_c_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_1[ac_c_table], i,
s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
}
/* unpack the group 2 AC coefficients (coeffs 6-14) */
for (i = 6; i <= 14; i++) {
debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n",
i, ac_y_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_2[ac_y_table], i,
s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n",
i, ac_c_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_2[ac_c_table], i,
s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
}
/* unpack the group 3 AC coefficients (coeffs 15-27) */
for (i = 15; i <= 27; i++) {
debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n",
i, ac_y_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_3[ac_y_table], i,
s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n",
i, ac_c_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_3[ac_c_table], i,
s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
}
/* unpack the group 4 AC coefficients (coeffs 28-63) */
for (i = 28; i <= 63; i++) {
debug_vp3(" vp3: unpacking level %d Y plane AC coefficients using table %d\n",
i, ac_y_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_4[ac_y_table], i,
s->first_coded_y_fragment, s->last_coded_y_fragment, residual_eob_run);
debug_vp3(" vp3: unpacking level %d C plane AC coefficients using table %d\n",
i, ac_c_table);
residual_eob_run = unpack_vlcs(s, gb, &s->ac_vlc_4[ac_c_table], i,
s->first_coded_c_fragment, s->last_coded_c_fragment, residual_eob_run);
}
return 0;
}
/*
* This function reverses the DC prediction for each coded fragment in
* the frame. Much of this function is adapted directly from the original
* VP3 source code.
*/
#define COMPATIBLE_FRAME(x) \
(compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)
#define FRAME_CODED(x) (s->all_fragments[x].coding_method != MODE_COPY)
#define DC_COEFF(u) (s->coeffs[u].index ? 0 : s->coeffs[u].coeff) //FIXME do somethin to simplify this
static void reverse_dc_prediction(Vp3DecodeContext *s,
int first_fragment,
int fragment_width,
int fragment_height)
{
#define PUL 8
#define PU 4
#define PUR 2
#define PL 1
int x, y;
int i = first_fragment;
int predicted_dc;
/* DC values for the left, up-left, up, and up-right fragments */
int vl, vul, vu, vur;
/* indices for the left, up-left, up, and up-right fragments */
int l, ul, u, ur;
/*
* The 6 fields mean:
* 0: up-left multiplier
* 1: up multiplier
* 2: up-right multiplier
* 3: left multiplier
*/
int predictor_transform[16][4] = {
{ 0, 0, 0, 0},
{ 0, 0, 0,128}, // PL
{ 0, 0,128, 0}, // PUR
{ 0, 0, 53, 75}, // PUR|PL
{ 0,128, 0, 0}, // PU
{ 0, 64, 0, 64}, // PU|PL
{ 0,128, 0, 0}, // PU|PUR
{ 0, 0, 53, 75}, // PU|PUR|PL
{128, 0, 0, 0}, // PUL
{ 0, 0, 0,128}, // PUL|PL
{ 64, 0, 64, 0}, // PUL|PUR
{ 0, 0, 53, 75}, // PUL|PUR|PL
{ 0,128, 0, 0}, // PUL|PU
{-104,116, 0,116}, // PUL|PU|PL
{ 24, 80, 24, 0}, // PUL|PU|PUR
{-104,116, 0,116} // PUL|PU|PUR|PL
};
/* This table shows which types of blocks can use other blocks for
* prediction. For example, INTRA is the only mode in this table to
* have a frame number of 0. That means INTRA blocks can only predict
* from other INTRA blocks. There are 2 golden frame coding types;
* blocks encoding in these modes can only predict from other blocks
* that were encoded with these 1 of these 2 modes. */
unsigned char compatible_frame[8] = {
1, /* MODE_INTER_NO_MV */
0, /* MODE_INTRA */
1, /* MODE_INTER_PLUS_MV */
1, /* MODE_INTER_LAST_MV */
1, /* MODE_INTER_PRIOR_MV */
2, /* MODE_USING_GOLDEN */
2, /* MODE_GOLDEN_MV */
1 /* MODE_INTER_FOUR_MV */
};
int current_frame_type;
/* there is a last DC predictor for each of the 3 frame types */
short last_dc[3];
int transform = 0;
debug_vp3(" vp3: reversing DC prediction\n");
vul = vu = vur = vl = 0;
last_dc[0] = last_dc[1] = last_dc[2] = 0;
/* for each fragment row... */
for (y = 0; y < fragment_height; y++) {
/* for each fragment in a row... */
for (x = 0; x < fragment_width; x++, i++) {
/* reverse prediction if this block was coded */
if (s->all_fragments[i].coding_method != MODE_COPY) {
current_frame_type =
compatible_frame[s->all_fragments[i].coding_method];
debug_dc_pred(" frag %d: orig DC = %d, ",
i, DC_COEFF(i));
transform= 0;
if(x){
l= i-1;
vl = DC_COEFF(l);
if(FRAME_CODED(l) && COMPATIBLE_FRAME(l))
transform |= PL;
}
if(y){
u= i-fragment_width;
vu = DC_COEFF(u);
if(FRAME_CODED(u) && COMPATIBLE_FRAME(u))
transform |= PU;
if(x){
ul= i-fragment_width-1;
vul = DC_COEFF(ul);
if(FRAME_CODED(ul) && COMPATIBLE_FRAME(ul))
transform |= PUL;
}
if(x + 1 < fragment_width){
ur= i-fragment_width+1;
vur = DC_COEFF(ur);
if(FRAME_CODED(ur) && COMPATIBLE_FRAME(ur))
transform |= PUR;
}
}
debug_dc_pred("transform = %d, ", transform);
if (transform == 0) {
/* if there were no fragments to predict from, use last
* DC saved */
predicted_dc = last_dc[current_frame_type];
debug_dc_pred("from last DC (%d) = %d\n",
current_frame_type, DC_COEFF(i));
} else {
/* apply the appropriate predictor transform */
predicted_dc =
(predictor_transform[transform][0] * vul) +
(predictor_transform[transform][1] * vu) +
(predictor_transform[transform][2] * vur) +
(predictor_transform[transform][3] * vl);
predicted_dc /= 128;
/* check for outranging on the [ul u l] and
* [ul u ur l] predictors */
if ((transform == 13) || (transform == 15)) {
if (FFABS(predicted_dc - vu) > 128)
predicted_dc = vu;
else if (FFABS(predicted_dc - vl) > 128)
predicted_dc = vl;
else if (FFABS(predicted_dc - vul) > 128)
predicted_dc = vul;
}
debug_dc_pred("from pred DC = %d\n",
DC_COEFF(i));
}
/* at long last, apply the predictor */
if(s->coeffs[i].index){
*s->next_coeff= s->coeffs[i];
s->coeffs[i].index=0;
s->coeffs[i].coeff=0;
s->coeffs[i].next= s->next_coeff++;
}
s->coeffs[i].coeff += predicted_dc;
/* save the DC */
last_dc[current_frame_type] = DC_COEFF(i);
if(DC_COEFF(i) && !(s->all_fragments[i].coeff_count&127)){
s->all_fragments[i].coeff_count= 129;
// s->all_fragments[i].next_coeff= s->next_coeff;
s->coeffs[i].next= s->next_coeff;
(s->next_coeff++)->next=NULL;
}
}
}
}
}
static void horizontal_filter(unsigned char *first_pixel, int stride,
int *bounding_values);
static void vertical_filter(unsigned char *first_pixel, int stride,
int *bounding_values);
/*
* Perform the final rendering for a particular slice of data.
* The slice number ranges from 0..(macroblock_height - 1).
*/
static void render_slice(Vp3DecodeContext *s, int slice)
{
int x;
int m, n;
int16_t *dequantizer;
DECLARE_ALIGNED_16(DCTELEM, block[64]);
int motion_x = 0xdeadbeef, motion_y = 0xdeadbeef;
int motion_halfpel_index;
uint8_t *motion_source;
int plane;
int current_macroblock_entry = slice * s->macroblock_width * 6;
if (slice >= s->macroblock_height)
return;
for (plane = 0; plane < 3; plane++) {
uint8_t *output_plane = s->current_frame.data [plane];
uint8_t * last_plane = s-> last_frame.data [plane];
uint8_t *golden_plane = s-> golden_frame.data [plane];
int stride = s->current_frame.linesize[plane];
int plane_width = s->width >> !!plane;
int plane_height = s->height >> !!plane;
int y = slice * FRAGMENT_PIXELS << !plane ;
int slice_height = y + (FRAGMENT_PIXELS << !plane);
int i = s->macroblock_fragments[current_macroblock_entry + plane + 3*!!plane];
if (!s->flipped_image) stride = -stride;
if(FFABS(stride) > 2048)
return; //various tables are fixed size
/* for each fragment row in the slice (both of them)... */
for (; y < slice_height; y += 8) {
/* for each fragment in a row... */
for (x = 0; x < plane_width; x += 8, i++) {
if ((i < 0) || (i >= s->fragment_count)) {
av_log(s->avctx, AV_LOG_ERROR, " vp3:render_slice(): bad fragment number (%d)\n", i);
return;
}
/* transform if this block was coded */
if ((s->all_fragments[i].coding_method != MODE_COPY) &&
!((s->avctx->flags & CODEC_FLAG_GRAY) && plane)) {
if ((s->all_fragments[i].coding_method == MODE_USING_GOLDEN) ||
(s->all_fragments[i].coding_method == MODE_GOLDEN_MV))
motion_source= golden_plane;
else
motion_source= last_plane;
motion_source += s->all_fragments[i].first_pixel;
motion_halfpel_index = 0;
/* sort out the motion vector if this fragment is coded
* using a motion vector method */
if ((s->all_fragments[i].coding_method > MODE_INTRA) &&
(s->all_fragments[i].coding_method != MODE_USING_GOLDEN)) {
int src_x, src_y;
motion_x = s->all_fragments[i].motion_x;
motion_y = s->all_fragments[i].motion_y;
if(plane){
motion_x= (motion_x>>1) | (motion_x&1);
motion_y= (motion_y>>1) | (motion_y&1);
}
src_x= (motion_x>>1) + x;
src_y= (motion_y>>1) + y;
if ((motion_x == 127) || (motion_y == 127))
av_log(s->avctx, AV_LOG_ERROR, " help! got invalid motion vector! (%X, %X)\n", motion_x, motion_y);
motion_halfpel_index = motion_x & 0x01;
motion_source += (motion_x >> 1);
motion_halfpel_index |= (motion_y & 0x01) << 1;
motion_source += ((motion_y >> 1) * stride);
if(src_x<0 || src_y<0 || src_x + 9 >= plane_width || src_y + 9 >= plane_height){
uint8_t *temp= s->edge_emu_buffer;
if(stride<0) temp -= 9*stride;
else temp += 9*stride;
ff_emulated_edge_mc(temp, motion_source, stride, 9, 9, src_x, src_y, plane_width, plane_height);
motion_source= temp;
}
}
/* first, take care of copying a block from either the
* previous or the golden frame */
if (s->all_fragments[i].coding_method != MODE_INTRA) {
/* Note, it is possible to implement all MC cases with
put_no_rnd_pixels_l2 which would look more like the
VP3 source but this would be slower as
put_no_rnd_pixels_tab is better optimzed */
if(motion_halfpel_index != 3){
s->dsp.put_no_rnd_pixels_tab[1][motion_halfpel_index](
output_plane + s->all_fragments[i].first_pixel,
motion_source, stride, 8);
}else{
int d= (motion_x ^ motion_y)>>31; // d is 0 if motion_x and _y have the same sign, else -1
s->dsp.put_no_rnd_pixels_l2[1](
output_plane + s->all_fragments[i].first_pixel,
motion_source - d,
motion_source + stride + 1 + d,
stride, 8);
}
dequantizer = s->qmat[1][plane];
}else{
dequantizer = s->qmat[0][plane];
}
/* dequantize the DCT coefficients */
debug_idct("fragment %d, coding mode %d, DC = %d, dequant = %d:\n",
i, s->all_fragments[i].coding_method,
DC_COEFF(i), dequantizer[0]);
if(s->avctx->idct_algo==FF_IDCT_VP3){
Coeff *coeff= s->coeffs + i;
memset(block, 0, sizeof(block));
while(coeff->next){
block[coeff->index]= coeff->coeff * dequantizer[coeff->index];
coeff= coeff->next;
}
}else{
Coeff *coeff= s->coeffs + i;
memset(block, 0, sizeof(block));
while(coeff->next){
block[coeff->index]= (coeff->coeff * dequantizer[coeff->index] + 2)>>2;
coeff= coeff->next;
}
}
/* invert DCT and place (or add) in final output */
if (s->all_fragments[i].coding_method == MODE_INTRA) {
if(s->avctx->idct_algo!=FF_IDCT_VP3)
block[0] += 128<<3;
s->dsp.idct_put(
output_plane + s->all_fragments[i].first_pixel,
stride,
block);
} else {
s->dsp.idct_add(
output_plane + s->all_fragments[i].first_pixel,
stride,
block);
}
debug_idct("block after idct_%s():\n",
(s->all_fragments[i].coding_method == MODE_INTRA)?
"put" : "add");
for (m = 0; m < 8; m++) {
for (n = 0; n < 8; n++) {
debug_idct(" %3d", *(output_plane +
s->all_fragments[i].first_pixel + (m * stride + n)));
}
debug_idct("\n");
}
debug_idct("\n");
} else {
/* copy directly from the previous frame */
s->dsp.put_pixels_tab[1][0](
output_plane + s->all_fragments[i].first_pixel,
last_plane + s->all_fragments[i].first_pixel,
stride, 8);
}
#if 0
/* perform the left edge filter if:
* - the fragment is not on the left column
* - the fragment is coded in this frame
* - the fragment is not coded in this frame but the left
* fragment is coded in this frame (this is done instead
* of a right edge filter when rendering the left fragment
* since this fragment is not available yet) */
if ((x > 0) &&
((s->all_fragments[i].coding_method != MODE_COPY) ||
((s->all_fragments[i].coding_method == MODE_COPY) &&
(s->all_fragments[i - 1].coding_method != MODE_COPY)) )) {
horizontal_filter(
output_plane + s->all_fragments[i].first_pixel + 7*stride,
-stride, s->bounding_values_array + 127);
}
/* perform the top edge filter if:
* - the fragment is not on the top row
* - the fragment is coded in this frame
* - the fragment is not coded in this frame but the above
* fragment is coded in this frame (this is done instead
* of a bottom edge filter when rendering the above
* fragment since this fragment is not available yet) */
if ((y > 0) &&
((s->all_fragments[i].coding_method != MODE_COPY) ||
((s->all_fragments[i].coding_method == MODE_COPY) &&
(s->all_fragments[i - fragment_width].coding_method != MODE_COPY)) )) {
vertical_filter(
output_plane + s->all_fragments[i].first_pixel - stride,
-stride, s->bounding_values_array + 127);
}
#endif
}
}
}
/* this looks like a good place for slice dispatch... */
/* algorithm:
* if (slice == s->macroblock_height - 1)
* dispatch (both last slice & 2nd-to-last slice);
* else if (slice > 0)
* dispatch (slice - 1);
*/
emms_c();
}
static void horizontal_filter(unsigned char *first_pixel, int stride,
int *bounding_values)
{
unsigned char *end;
int filter_value;
for (end= first_pixel + 8*stride; first_pixel != end; first_pixel += stride) {
filter_value =
(first_pixel[-2] - first_pixel[ 1])
+3*(first_pixel[ 0] - first_pixel[-1]);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[-1] = av_clip_uint8(first_pixel[-1] + filter_value);
first_pixel[ 0] = av_clip_uint8(first_pixel[ 0] - filter_value);
}
}
static void vertical_filter(unsigned char *first_pixel, int stride,
int *bounding_values)
{
unsigned char *end;
int filter_value;
const int nstride= -stride;
for (end= first_pixel + 8; first_pixel < end; first_pixel++) {
filter_value =
(first_pixel[2 * nstride] - first_pixel[ stride])
+3*(first_pixel[0 ] - first_pixel[nstride]);
filter_value = bounding_values[(filter_value + 4) >> 3];
first_pixel[nstride] = av_clip_uint8(first_pixel[nstride] + filter_value);
first_pixel[0] = av_clip_uint8(first_pixel[0] - filter_value);
}
}
static void apply_loop_filter(Vp3DecodeContext *s)
{
int plane;
int x, y;
int *bounding_values= s->bounding_values_array+127;
#if 0
int bounding_values_array[256];
int filter_limit;
/* find the right loop limit value */
for (x = 63; x >= 0; x--) {
if (vp31_ac_scale_factor[x] >= s->quality_index)
break;
}
filter_limit = vp31_filter_limit_values[s->quality_index];
/* set up the bounding values */
memset(bounding_values_array, 0, 256 * sizeof(int));
for (x = 0; x < filter_limit; x++) {
bounding_values[-x - filter_limit] = -filter_limit + x;
bounding_values[-x] = -x;
bounding_values[x] = x;
bounding_values[x + filter_limit] = filter_limit - x;
}
#endif
for (plane = 0; plane < 3; plane++) {
int width = s->fragment_width >> !!plane;
int height = s->fragment_height >> !!plane;
int fragment = s->fragment_start [plane];
int stride = s->current_frame.linesize[plane];
uint8_t *plane_data = s->current_frame.data [plane];
if (!s->flipped_image) stride = -stride;
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
START_TIMER
/* do not perform left edge filter for left columns frags */
if ((x > 0) &&
(s->all_fragments[fragment].coding_method != MODE_COPY)) {
horizontal_filter(
plane_data + s->all_fragments[fragment].first_pixel,
stride, bounding_values);
}
/* do not perform top edge filter for top row fragments */
if ((y > 0) &&
(s->all_fragments[fragment].coding_method != MODE_COPY)) {
vertical_filter(
plane_data + s->all_fragments[fragment].first_pixel,
stride, bounding_values);
}
/* do not perform right edge filter for right column
* fragments or if right fragment neighbor is also coded
* in this frame (it will be filtered in next iteration) */
if ((x < width - 1) &&
(s->all_fragments[fragment].coding_method != MODE_COPY) &&
(s->all_fragments[fragment + 1].coding_method == MODE_COPY)) {
horizontal_filter(
plane_data + s->all_fragments[fragment + 1].first_pixel,
stride, bounding_values);
}
/* do not perform bottom edge filter for bottom row
* fragments or if bottom fragment neighbor is also coded
* in this frame (it will be filtered in the next row) */
if ((y < height - 1) &&
(s->all_fragments[fragment].coding_method != MODE_COPY) &&
(s->all_fragments[fragment + width].coding_method == MODE_COPY)) {
vertical_filter(
plane_data + s->all_fragments[fragment + width].first_pixel,
stride, bounding_values);
}
fragment++;
STOP_TIMER("loop filter")
}
}
}
}
/*
* This function computes the first pixel addresses for each fragment.
* This function needs to be invoked after the first frame is allocated
* so that it has access to the plane strides.
*/
static void vp3_calculate_pixel_addresses(Vp3DecodeContext *s)
{
int i, x, y;
/* figure out the first pixel addresses for each of the fragments */
/* Y plane */
i = 0;
for (y = s->fragment_height; y > 0; y--) {
for (x = 0; x < s->fragment_width; x++) {
s->all_fragments[i++].first_pixel =
s->golden_frame.linesize[0] * y * FRAGMENT_PIXELS -
s->golden_frame.linesize[0] +
x * FRAGMENT_PIXELS;
debug_init(" fragment %d, first pixel @ %d\n",
i-1, s->all_fragments[i-1].first_pixel);
}
}
/* U plane */
i = s->fragment_start[1];
for (y = s->fragment_height / 2; y > 0; y--) {
for (x = 0; x < s->fragment_width / 2; x++) {
s->all_fragments[i++].first_pixel =
s->golden_frame.linesize[1] * y * FRAGMENT_PIXELS -
s->golden_frame.linesize[1] +
x * FRAGMENT_PIXELS;
debug_init(" fragment %d, first pixel @ %d\n",
i-1, s->all_fragments[i-1].first_pixel);
}
}
/* V plane */
i = s->fragment_start[2];
for (y = s->fragment_height / 2; y > 0; y--) {
for (x = 0; x < s->fragment_width / 2; x++) {
s->all_fragments[i++].first_pixel =
s->golden_frame.linesize[2] * y * FRAGMENT_PIXELS -
s->golden_frame.linesize[2] +
x * FRAGMENT_PIXELS;
debug_init(" fragment %d, first pixel @ %d\n",
i-1, s->all_fragments[i-1].first_pixel);
}
}
}
/* FIXME: this should be merged with the above! */
static void theora_calculate_pixel_addresses(Vp3DecodeContext *s)
{
int i, x, y;
/* figure out the first pixel addresses for each of the fragments */
/* Y plane */
i = 0;
for (y = 1; y <= s->fragment_height; y++) {
for (x = 0; x < s->fragment_width; x++) {
s->all_fragments[i++].first_pixel =
s->golden_frame.linesize[0] * y * FRAGMENT_PIXELS -
s->golden_frame.linesize[0] +
x * FRAGMENT_PIXELS;
debug_init(" fragment %d, first pixel @ %d\n",
i-1, s->all_fragments[i-1].first_pixel);
}
}
/* U plane */
i = s->fragment_start[1];
for (y = 1; y <= s->fragment_height / 2; y++) {
for (x = 0; x < s->fragment_width / 2; x++) {
s->all_fragments[i++].first_pixel =
s->golden_frame.linesize[1] * y * FRAGMENT_PIXELS -
s->golden_frame.linesize[1] +
x * FRAGMENT_PIXELS;
debug_init(" fragment %d, first pixel @ %d\n",
i-1, s->all_fragments[i-1].first_pixel);
}
}
/* V plane */
i = s->fragment_start[2];
for (y = 1; y <= s->fragment_height / 2; y++) {
for (x = 0; x < s->fragment_width / 2; x++) {
s->all_fragments[i++].first_pixel =
s->golden_frame.linesize[2] * y * FRAGMENT_PIXELS -
s->golden_frame.linesize[2] +
x * FRAGMENT_PIXELS;
debug_init(" fragment %d, first pixel @ %d\n",
i-1, s->all_fragments[i-1].first_pixel);
}
}
}
/*
* This is the ffmpeg/libavcodec API init function.
*/
static int vp3_decode_init(AVCodecContext *avctx)
{
Vp3DecodeContext *s = avctx->priv_data;
int i, inter, plane;
int c_width;
int c_height;
int y_superblock_count;
int c_superblock_count;
if (avctx->codec_tag == MKTAG('V','P','3','0'))
s->version = 0;
else
s->version = 1;
s->avctx = avctx;
s->width = (avctx->width + 15) & 0xFFFFFFF0;
s->height = (avctx->height + 15) & 0xFFFFFFF0;
avctx->pix_fmt = PIX_FMT_YUV420P;
avctx->has_b_frames = 0;
if(avctx->idct_algo==FF_IDCT_AUTO)
avctx->idct_algo=FF_IDCT_VP3;
dsputil_init(&s->dsp, avctx);
ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
/* initialize to an impossible value which will force a recalculation
* in the first frame decode */
s->quality_index = -1;
s->y_superblock_width = (s->width + 31) / 32;
s->y_superblock_height = (s->height + 31) / 32;
y_superblock_count = s->y_superblock_width * s->y_superblock_height;
/* work out the dimensions for the C planes */
c_width = s->width / 2;
c_height = s->height / 2;
s->c_superblock_width = (c_width + 31) / 32;
s->c_superblock_height = (c_height + 31) / 32;
c_superblock_count = s->c_superblock_width * s->c_superblock_height;
s->superblock_count = y_superblock_count + (c_superblock_count * 2);
s->u_superblock_start = y_superblock_count;
s->v_superblock_start = s->u_superblock_start + c_superblock_count;
s->superblock_coding = av_malloc(s->superblock_count);
s->macroblock_width = (s->width + 15) / 16;
s->macroblock_height = (s->height + 15) / 16;
s->macroblock_count = s->macroblock_width * s->macroblock_height;
s->fragment_width = s->width / FRAGMENT_PIXELS;
s->fragment_height = s->height / FRAGMENT_PIXELS;
/* fragment count covers all 8x8 blocks for all 3 planes */
s->fragment_count = s->fragment_width * s->fragment_height * 3 / 2;
s->fragment_start[1] = s->fragment_width * s->fragment_height;
s->fragment_start[2] = s->fragment_width * s->fragment_height * 5 / 4;
debug_init(" Y plane: %d x %d\n", s->width, s->height);
debug_init(" C plane: %d x %d\n", c_width, c_height);
debug_init(" Y superblocks: %d x %d, %d total\n",
s->y_superblock_width, s->y_superblock_height, y_superblock_count);
debug_init(" C superblocks: %d x %d, %d total\n",
s->c_superblock_width, s->c_superblock_height, c_superblock_count);
debug_init(" total superblocks = %d, U starts @ %d, V starts @ %d\n",
s->superblock_count, s->u_superblock_start, s->v_superblock_start);
debug_init(" macroblocks: %d x %d, %d total\n",
s->macroblock_width, s->macroblock_height, s->macroblock_count);
debug_init(" %d fragments, %d x %d, u starts @ %d, v starts @ %d\n",
s->fragment_count,
s->fragment_width,
s->fragment_height,
s->fragment_start[1],
s->fragment_start[2]);
s->all_fragments = av_malloc(s->fragment_count * sizeof(Vp3Fragment));
s->coeffs = av_malloc(s->fragment_count * sizeof(Coeff) * 65);
s->coded_fragment_list = av_malloc(s->fragment_count * sizeof(int));
s->pixel_addresses_inited = 0;
if (!s->theora_tables)
{
for (i = 0; i < 64; i++) {
s->coded_dc_scale_factor[i] = vp31_dc_scale_factor[i];
s->coded_ac_scale_factor[i] = vp31_ac_scale_factor[i];
s->base_matrix[0][i] = vp31_intra_y_dequant[i];
s->base_matrix[1][i] = vp31_intra_c_dequant[i];
s->base_matrix[2][i] = vp31_inter_dequant[i];
s->filter_limit_values[i] = vp31_filter_limit_values[i];
}
for(inter=0; inter<2; inter++){
for(plane=0; plane<3; plane++){
s->qr_count[inter][plane]= 1;
s->qr_size [inter][plane][0]= 63;
s->qr_base [inter][plane][0]=
s->qr_base [inter][plane][1]= 2*inter + (!!plane)*!inter;
}
}
/* init VLC tables */
for (i = 0; i < 16; i++) {
/* DC histograms */
init_vlc(&s->dc_vlc[i], 5, 32,
&dc_bias[i][0][1], 4, 2,
&dc_bias[i][0][0], 4, 2, 0);
/* group 1 AC histograms */
init_vlc(&s->ac_vlc_1[i], 5, 32,
&ac_bias_0[i][0][1], 4, 2,
&ac_bias_0[i][0][0], 4, 2, 0);
/* group 2 AC histograms */
init_vlc(&s->ac_vlc_2[i], 5, 32,
&ac_bias_1[i][0][1], 4, 2,
&ac_bias_1[i][0][0], 4, 2, 0);
/* group 3 AC histograms */
init_vlc(&s->ac_vlc_3[i], 5, 32,
&ac_bias_2[i][0][1], 4, 2,
&ac_bias_2[i][0][0], 4, 2, 0);
/* group 4 AC histograms */
init_vlc(&s->ac_vlc_4[i], 5, 32,
&ac_bias_3[i][0][1], 4, 2,
&ac_bias_3[i][0][0], 4, 2, 0);
}
} else {
for (i = 0; i < 16; i++) {
/* DC histograms */
init_vlc(&s->dc_vlc[i], 5, 32,
&s->huffman_table[i][0][1], 4, 2,
&s->huffman_table[i][0][0], 4, 2, 0);
/* group 1 AC histograms */
init_vlc(&s->ac_vlc_1[i], 5, 32,
&s->huffman_table[i+16][0][1], 4, 2,
&s->huffman_table[i+16][0][0], 4, 2, 0);
/* group 2 AC histograms */
init_vlc(&s->ac_vlc_2[i], 5, 32,
&s->huffman_table[i+16*2][0][1], 4, 2,
&s->huffman_table[i+16*2][0][0], 4, 2, 0);
/* group 3 AC histograms */
init_vlc(&s->ac_vlc_3[i], 5, 32,
&s->huffman_table[i+16*3][0][1], 4, 2,
&s->huffman_table[i+16*3][0][0], 4, 2, 0);
/* group 4 AC histograms */
init_vlc(&s->ac_vlc_4[i], 5, 32,
&s->huffman_table[i+16*4][0][1], 4, 2,
&s->huffman_table[i+16*4][0][0], 4, 2, 0);
}
}
init_vlc(&s->superblock_run_length_vlc, 6, 34,
&superblock_run_length_vlc_table[0][1], 4, 2,
&superblock_run_length_vlc_table[0][0], 4, 2, 0);
init_vlc(&s->fragment_run_length_vlc, 5, 30,
&fragment_run_length_vlc_table[0][1], 4, 2,
&fragment_run_length_vlc_table[0][0], 4, 2, 0);
init_vlc(&s->mode_code_vlc, 3, 8,
&mode_code_vlc_table[0][1], 2, 1,
&mode_code_vlc_table[0][0], 2, 1, 0);
init_vlc(&s->motion_vector_vlc, 6, 63,
&motion_vector_vlc_table[0][1], 2, 1,
&motion_vector_vlc_table[0][0], 2, 1, 0);
/* work out the block mapping tables */
s->superblock_fragments = av_malloc(s->superblock_count * 16 * sizeof(int));
s->superblock_macroblocks = av_malloc(s->superblock_count * 4 * sizeof(int));
s->macroblock_fragments = av_malloc(s->macroblock_count * 6 * sizeof(int));
s->macroblock_coding = av_malloc(s->macroblock_count + 1);
init_block_mapping(s);
for (i = 0; i < 3; i++) {
s->current_frame.data[i] = NULL;
s->last_frame.data[i] = NULL;
s->golden_frame.data[i] = NULL;
}
return 0;
}
/*
* This is the ffmpeg/libavcodec API frame decode function.
*/
static int vp3_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
uint8_t *buf, int buf_size)
{
Vp3DecodeContext *s = avctx->priv_data;
GetBitContext gb;
static int counter = 0;
int i;
init_get_bits(&gb, buf, buf_size * 8);
if (s->theora && get_bits1(&gb))
{
#if 1
av_log(avctx, AV_LOG_ERROR, "Header packet passed to frame decoder, skipping\n");
return -1;
#else
int ptype = get_bits(&gb, 7);
skip_bits(&gb, 6*8); /* "theora" */
switch(ptype)
{
case 1:
theora_decode_comments(avctx, &gb);
break;
case 2:
theora_decode_tables(avctx, &gb);
init_dequantizer(s);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown Theora config packet: %d\n", ptype);
}
return buf_size;
#endif
}
s->keyframe = !get_bits1(&gb);
if (!s->theora)
skip_bits(&gb, 1);
s->last_quality_index = s->quality_index;
s->nqis=0;
do{
s->qis[s->nqis++]= get_bits(&gb, 6);
} while(s->theora >= 0x030200 && s->nqis<3 && get_bits1(&gb));
s->quality_index= s->qis[0];
if (s->avctx->debug & FF_DEBUG_PICT_INFO)
av_log(s->avctx, AV_LOG_INFO, " VP3 %sframe #%d: Q index = %d\n",
s->keyframe?"key":"", counter, s->quality_index);
counter++;
if (s->quality_index != s->last_quality_index) {
init_dequantizer(s);
init_loop_filter(s);
}
if (s->keyframe) {
if (!s->theora)
{
skip_bits(&gb, 4); /* width code */
skip_bits(&gb, 4); /* height code */
if (s->version)
{
s->version = get_bits(&gb, 5);
if (counter == 1)
av_log(s->avctx, AV_LOG_DEBUG, "VP version: %d\n", s->version);
}
}
if (s->version || s->theora)
{
if (get_bits1(&gb))
av_log(s->avctx, AV_LOG_ERROR, "Warning, unsupported keyframe coding type?!\n");
skip_bits(&gb, 2); /* reserved? */
}
if (s->last_frame.data[0] == s->golden_frame.data[0]) {
if (s->golden_frame.data[0])
avctx->release_buffer(avctx, &s->golden_frame);
s->last_frame= s->golden_frame; /* ensure that we catch any access to this released frame */
} else {
if (s->golden_frame.data[0])
avctx->release_buffer(avctx, &s->golden_frame);
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);
}
s->golden_frame.reference = 3;
if(avctx->get_buffer(avctx, &s->golden_frame) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n");
return -1;
}
/* golden frame is also the current frame */
s->current_frame= s->golden_frame;
/* time to figure out pixel addresses? */
if (!s->pixel_addresses_inited)
{
if (!s->flipped_image)
vp3_calculate_pixel_addresses(s);
else
theora_calculate_pixel_addresses(s);
s->pixel_addresses_inited = 1;
}
} else {
/* allocate a new current frame */
s->current_frame.reference = 3;
if (!s->pixel_addresses_inited) {
av_log(s->avctx, AV_LOG_ERROR, "vp3: first frame not a keyframe\n");
return -1;
}
if(avctx->get_buffer(avctx, &s->current_frame) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "vp3: get_buffer() failed\n");
return -1;
}
}
s->current_frame.qscale_table= s->qscale_table; //FIXME allocate individual tables per AVFrame
s->current_frame.qstride= 0;
{START_TIMER
init_frame(s, &gb);
STOP_TIMER("init_frame")}
#if KEYFRAMES_ONLY
if (!s->keyframe) {
memcpy(s->current_frame.data[0], s->golden_frame.data[0],
s->current_frame.linesize[0] * s->height);
memcpy(s->current_frame.data[1], s->golden_frame.data[1],
s->current_frame.linesize[1] * s->height / 2);
memcpy(s->current_frame.data[2], s->golden_frame.data[2],
s->current_frame.linesize[2] * s->height / 2);
} else {
#endif
{START_TIMER
if (unpack_superblocks(s, &gb)){
av_log(s->avctx, AV_LOG_ERROR, "error in unpack_superblocks\n");
return -1;
}
STOP_TIMER("unpack_superblocks")}
{START_TIMER
if (unpack_modes(s, &gb)){
av_log(s->avctx, AV_LOG_ERROR, "error in unpack_modes\n");
return -1;
}
STOP_TIMER("unpack_modes")}
{START_TIMER
if (unpack_vectors(s, &gb)){
av_log(s->avctx, AV_LOG_ERROR, "error in unpack_vectors\n");
return -1;
}
STOP_TIMER("unpack_vectors")}
{START_TIMER
if (unpack_dct_coeffs(s, &gb)){
av_log(s->avctx, AV_LOG_ERROR, "error in unpack_dct_coeffs\n");
return -1;
}
STOP_TIMER("unpack_dct_coeffs")}
{START_TIMER
reverse_dc_prediction(s, 0, s->fragment_width, s->fragment_height);
if ((avctx->flags & CODEC_FLAG_GRAY) == 0) {
reverse_dc_prediction(s, s->fragment_start[1],
s->fragment_width / 2, s->fragment_height / 2);
reverse_dc_prediction(s, s->fragment_start[2],
s->fragment_width / 2, s->fragment_height / 2);
}
STOP_TIMER("reverse_dc_prediction")}
{START_TIMER
for (i = 0; i < s->macroblock_height; i++)
render_slice(s, i);
STOP_TIMER("render_fragments")}
{START_TIMER
apply_loop_filter(s);
STOP_TIMER("apply_loop_filter")}
#if KEYFRAMES_ONLY
}
#endif
*data_size=sizeof(AVFrame);
*(AVFrame*)data= s->current_frame;
/* release the last frame, if it is allocated and if it is not the
* golden frame */
if ((s->last_frame.data[0]) &&
(s->last_frame.data[0] != s->golden_frame.data[0]))
avctx->release_buffer(avctx, &s->last_frame);
/* shuffle frames (last = current) */
s->last_frame= s->current_frame;
s->current_frame.data[0]= NULL; /* ensure that we catch any access to this released frame */
return buf_size;
}
/*
* This is the ffmpeg/libavcodec API module cleanup function.
*/
static int vp3_decode_end(AVCodecContext *avctx)
{
Vp3DecodeContext *s = avctx->priv_data;
av_free(s->all_fragments);
av_free(s->coeffs);
av_free(s->coded_fragment_list);
av_free(s->superblock_fragments);
av_free(s->superblock_macroblocks);
av_free(s->macroblock_fragments);
av_free(s->macroblock_coding);
/* release all frames */
if (s->golden_frame.data[0] && s->golden_frame.data[0] != s->last_frame.data[0])
avctx->release_buffer(avctx, &s->golden_frame);
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);
/* no need to release the current_frame since it will always be pointing
* to the same frame as either the golden or last frame */
return 0;
}
static int read_huffman_tree(AVCodecContext *avctx, GetBitContext *gb)
{
Vp3DecodeContext *s = avctx->priv_data;
if (get_bits(gb, 1)) {
int token;
if (s->entries >= 32) { /* overflow */
av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
return -1;
}
token = get_bits(gb, 5);
//av_log(avctx, AV_LOG_DEBUG, "hti %d hbits %x token %d entry : %d size %d\n", s->hti, s->hbits, token, s->entries, s->huff_code_size);
s->huffman_table[s->hti][token][0] = s->hbits;
s->huffman_table[s->hti][token][1] = s->huff_code_size;
s->entries++;
}
else {
if (s->huff_code_size >= 32) {/* overflow */
av_log(avctx, AV_LOG_ERROR, "huffman tree overflow\n");
return -1;
}
s->huff_code_size++;
s->hbits <<= 1;
read_huffman_tree(avctx, gb);
s->hbits |= 1;
read_huffman_tree(avctx, gb);
s->hbits >>= 1;
s->huff_code_size--;
}
return 0;
}
static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
{
Vp3DecodeContext *s = avctx->priv_data;
s->theora = get_bits_long(gb, 24);
av_log(avctx, AV_LOG_INFO, "Theora bitstream version %X\n", s->theora);
/* 3.2.0 aka alpha3 has the same frame orientation as original vp3 */
/* but previous versions have the image flipped relative to vp3 */
if (s->theora < 0x030200)
{
s->flipped_image = 1;
av_log(avctx, AV_LOG_DEBUG, "Old (<alpha3) Theora bitstream, flipped image\n");
}
s->width = get_bits(gb, 16) << 4;
s->height = get_bits(gb, 16) << 4;
if(avcodec_check_dimensions(avctx, s->width, s->height)){
av_log(avctx, AV_LOG_ERROR, "Invalid dimensions (%dx%d)\n", s->width, s->height);
s->width= s->height= 0;
return -1;
}
if (s->theora >= 0x030400)
{
skip_bits(gb, 32); /* total number of superblocks in a frame */
// fixme, the next field is 36bits long
skip_bits(gb, 32); /* total number of blocks in a frame */
skip_bits(gb, 4); /* total number of blocks in a frame */
skip_bits(gb, 32); /* total number of macroblocks in a frame */
skip_bits(gb, 24); /* frame width */
skip_bits(gb, 24); /* frame height */
}
else
{
skip_bits(gb, 24); /* frame width */
skip_bits(gb, 24); /* frame height */
}
if (s->theora >= 0x030200) {
skip_bits(gb, 8); /* offset x */
skip_bits(gb, 8); /* offset y */
}
skip_bits(gb, 32); /* fps numerator */
skip_bits(gb, 32); /* fps denumerator */
skip_bits(gb, 24); /* aspect numerator */
skip_bits(gb, 24); /* aspect denumerator */
if (s->theora < 0x030200)
skip_bits(gb, 5); /* keyframe frequency force */
skip_bits(gb, 8); /* colorspace */
if (s->theora >= 0x030400)
skip_bits(gb, 2); /* pixel format: 420,res,422,444 */
skip_bits(gb, 24); /* bitrate */
skip_bits(gb, 6); /* quality hint */
if (s->theora >= 0x030200)
{
skip_bits(gb, 5); /* keyframe frequency force */
if (s->theora < 0x030400)
skip_bits(gb, 5); /* spare bits */
}
// align_get_bits(gb);
avctx->width = s->width;
avctx->height = s->height;
return 0;
}
static int theora_decode_tables(AVCodecContext *avctx, GetBitContext *gb)
{
Vp3DecodeContext *s = avctx->priv_data;
int i, n, matrices, inter, plane;
if (s->theora >= 0x030200) {
n = get_bits(gb, 3);
/* loop filter limit values table */
for (i = 0; i < 64; i++)
s->filter_limit_values[i] = get_bits(gb, n);
}
if (s->theora >= 0x030200)
n = get_bits(gb, 4) + 1;
else
n = 16;
/* quality threshold table */
for (i = 0; i < 64; i++)
s->coded_ac_scale_factor[i] = get_bits(gb, n);
if (s->theora >= 0x030200)
n = get_bits(gb, 4) + 1;
else
n = 16;
/* dc scale factor table */
for (i = 0; i < 64; i++)
s->coded_dc_scale_factor[i] = get_bits(gb, n);
if (s->theora >= 0x030200)
matrices = get_bits(gb, 9) + 1;
else
matrices = 3;
if(matrices > 384){
av_log(avctx, AV_LOG_ERROR, "invalid number of base matrixes\n");
return -1;
}
for(n=0; n<matrices; n++){
for (i = 0; i < 64; i++)
s->base_matrix[n][i]= get_bits(gb, 8);
}
for (inter = 0; inter <= 1; inter++) {
for (plane = 0; plane <= 2; plane++) {
int newqr= 1;
if (inter || plane > 0)
newqr = get_bits(gb, 1);
if (!newqr) {
int qtj, plj;
if(inter && get_bits(gb, 1)){
qtj = 0;
plj = plane;
}else{
qtj= (3*inter + plane - 1) / 3;
plj= (plane + 2) % 3;
}
s->qr_count[inter][plane]= s->qr_count[qtj][plj];
memcpy(s->qr_size[inter][plane], s->qr_size[qtj][plj], sizeof(s->qr_size[0][0]));
memcpy(s->qr_base[inter][plane], s->qr_base[qtj][plj], sizeof(s->qr_base[0][0]));
} else {
int qri= 0;
int qi = 0;
for(;;){
i= get_bits(gb, av_log2(matrices-1)+1);
if(i>= matrices){
av_log(avctx, AV_LOG_ERROR, "invalid base matrix index\n");
return -1;
}
s->qr_base[inter][plane][qri]= i;
if(qi >= 63)
break;
i = get_bits(gb, av_log2(63-qi)+1) + 1;
s->qr_size[inter][plane][qri++]= i;
qi += i;
}
if (qi > 63) {
av_log(avctx, AV_LOG_ERROR, "invalid qi %d > 63\n", qi);
return -1;
}
s->qr_count[inter][plane]= qri;
}
}
}
/* Huffman tables */
for (s->hti = 0; s->hti < 80; s->hti++) {
s->entries = 0;
s->huff_code_size = 1;
if (!get_bits(gb, 1)) {
s->hbits = 0;
read_huffman_tree(avctx, gb);
s->hbits = 1;
read_huffman_tree(avctx, gb);
}
}
s->theora_tables = 1;
return 0;
}
static int theora_decode_init(AVCodecContext *avctx)
{
Vp3DecodeContext *s = avctx->priv_data;
GetBitContext gb;
int ptype;
uint8_t *header_start[3];
int header_len[3];
int i;
s->theora = 1;
if (!avctx->extradata_size)
{
av_log(avctx, AV_LOG_ERROR, "Missing extradata!\n");
return -1;
}
if (ff_split_xiph_headers(avctx->extradata, avctx->extradata_size,
42, header_start, header_len) < 0) {
av_log(avctx, AV_LOG_ERROR, "Corrupt extradata\n");
return -1;
}
for(i=0;i<3;i++) {
init_get_bits(&gb, header_start[i], header_len[i]);
ptype = get_bits(&gb, 8);
debug_vp3("Theora headerpacket type: %x\n", ptype);
if (!(ptype & 0x80))
{
av_log(avctx, AV_LOG_ERROR, "Invalid extradata!\n");
// return -1;
}
// FIXME: Check for this as well.
skip_bits(&gb, 6*8); /* "theora" */
switch(ptype)
{
case 0x80:
theora_decode_header(avctx, &gb);
break;
case 0x81:
// FIXME: is this needed? it breaks sometimes
// theora_decode_comments(avctx, gb);
break;
case 0x82:
theora_decode_tables(avctx, &gb);
break;
default:
av_log(avctx, AV_LOG_ERROR, "Unknown Theora config packet: %d\n", ptype&~0x80);
break;
}
if(8*header_len[i] != get_bits_count(&gb))
av_log(avctx, AV_LOG_ERROR, "%d bits left in packet %X\n", 8*header_len[i] - get_bits_count(&gb), ptype);
if (s->theora < 0x030200)
break;
}
vp3_decode_init(avctx);
return 0;
}
AVCodec vp3_decoder = {
"vp3",
CODEC_TYPE_VIDEO,
CODEC_ID_VP3,
sizeof(Vp3DecodeContext),
vp3_decode_init,
NULL,
vp3_decode_end,
vp3_decode_frame,
0,
NULL
};
AVCodec theora_decoder = {
"theora",
CODEC_TYPE_VIDEO,
CODEC_ID_THEORA,
sizeof(Vp3DecodeContext),
theora_decode_init,
NULL,
vp3_decode_end,
vp3_decode_frame,
0,
NULL
};
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