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diracdec.c
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diracdec.c
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/*
* Copyright (C) 2007 Marco Gerards <marco@gnu.org>
* Copyright (C) 2009 David Conrad
* Copyright (C) 2011 Jordi Ortiz
*
* 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 libavcodec/diracdec.c
* Dirac Decoder
* @author Marco Gerards <marco@gnu.org>, David Conrad, Jordi Ortiz <nenjordi@gmail.com>
*/
#include "avcodec.h"
#include "dsputil.h"
#include "get_bits.h"
#include "bytestream.h"
#include "golomb.h"
#include "dirac_arith.h"
#include "mpeg12data.h"
#include "dwt.h"
#include "dirac.h"
#include "diracdsp.h"
/**
* The spec limits the number of wavelet decompositions to 4 for both
* level 1 (VC-2) and 128 (long-gop default).
* 5 decompositions is the maximum before >16-bit buffers are needed.
* Schroedinger allows this for DD 9,7 and 13,7 wavelets only, limiting
* the others to 4 decompositions (or 3 for the fidelity filter).
*
* We use this instead of MAX_DECOMPOSITIONS to save some memory.
*/
#define MAX_DWT_LEVELS 5
/**
* The spec limits this to 3 for frame coding, but in practice can be as high as 6
*/
#define MAX_REFERENCE_FRAMES 8
#define MAX_DELAY 5 /* limit for main profile for frame coding (TODO: field coding) */
#define MAX_FRAMES (MAX_REFERENCE_FRAMES + MAX_DELAY + 1)
#define MAX_QUANT 68 /* max quant for VC-2 */
#define MAX_BLOCKSIZE 32 /* maximum xblen/yblen we support */
/**
* DiracBlock->ref flags, if set then the block does MC from the given ref
*/
#define DIRAC_REF_MASK_REF1 1
#define DIRAC_REF_MASK_REF2 2
#define DIRAC_REF_MASK_GLOBAL 4
/**
* Value of Picture.reference when Picture is not a reference picture, but
* is held for delayed output.
*/
#define DELAYED_PIC_REF 4
#define ff_emulated_edge_mc ff_emulated_edge_mc_8 /* Fix: change the calls to this function regarding bit depth */
#define CALC_PADDING(size, depth) \
(((size + (1 << depth) - 1) >> depth) << depth)
#define DIVRNDUP(a, b) (((a) + (b) - 1) / (b))
typedef struct {
AVFrame avframe;
int interpolated[3]; /* 1 if hpel[] is valid */
uint8_t *hpel[3][4];
uint8_t *hpel_base[3][4];
} DiracFrame;
typedef struct {
union {
int16_t mv[2][2];
int16_t dc[3];
} u; /* anonymous unions aren't in C99 :( */
uint8_t ref;
} DiracBlock;
typedef struct SubBand {
int level;
int orientation;
int stride;
int width;
int height;
int quant;
IDWTELEM *ibuf;
struct SubBand *parent;
/* for low delay */
unsigned length;
const uint8_t *coeff_data;
} SubBand;
typedef struct Plane {
int width;
int height;
int stride;
int idwt_width;
int idwt_height;
int idwt_stride;
IDWTELEM *idwt_buf;
IDWTELEM *idwt_buf_base;
IDWTELEM *idwt_tmp;
/* block length */
uint8_t xblen;
uint8_t yblen;
/* block separation (block n+1 starts after this many pixels in block n) */
uint8_t xbsep;
uint8_t ybsep;
/* amount of overspill on each edge (half of the overlap between blocks) */
uint8_t xoffset;
uint8_t yoffset;
SubBand band[MAX_DWT_LEVELS][4];
} Plane;
typedef struct DiracContext {
AVCodecContext *avctx;
DSPContext dsp;
DiracDSPContext diracdsp;
GetBitContext gb;
dirac_source_params source;
int seen_sequence_header;
int frame_number; /* number of the next frame to display */
Plane plane[3];
int chroma_x_shift;
int chroma_y_shift;
int zero_res; /* zero residue flag */
int is_arith; /* whether coeffs use arith or golomb coding */
int low_delay; /* use the low delay syntax */
int globalmc_flag; /* use global motion compensation */
int num_refs; /* number of reference pictures */
/* wavelet decoding */
unsigned wavelet_depth; /* depth of the IDWT */
unsigned wavelet_idx;
/**
* schroedinger older than 1.0.8 doesn't store
* quant delta if only one codebook exists in a band
*/
unsigned old_delta_quant;
unsigned codeblock_mode;
struct {
unsigned width;
unsigned height;
} codeblock[MAX_DWT_LEVELS+1];
struct {
unsigned num_x; /* number of horizontal slices */
unsigned num_y; /* number of vertical slices */
AVRational bytes; /* average bytes per slice */
uint8_t quant[MAX_DWT_LEVELS][4]; /* [DIRAC_STD] E.1 */
} lowdelay;
struct {
int pan_tilt[2]; /* pan/tilt vector */
int zrs[2][2]; /* zoom/rotate/shear matrix */
int perspective[2]; /* perspective vector */
unsigned zrs_exp;
unsigned perspective_exp;
} globalmc[2];
/* motion compensation */
uint8_t mv_precision; /* [DIRAC_STD] REFS_WT_PRECISION */
int16_t weight[2]; /* [DIRAC_STD] REF1_WT and REF2_WT */
unsigned weight_log2denom; /* [DIRAC_STD] REFS_WT_PRECISION */
int blwidth; /* number of blocks (horizontally) */
int blheight; /* number of blocks (vertically) */
int sbwidth; /* number of superblocks (horizontally) */
int sbheight; /* number of superblocks (vertically) */
uint8_t *sbsplit;
DiracBlock *blmotion;
uint8_t *edge_emu_buffer[4];
uint8_t *edge_emu_buffer_base;
uint16_t *mctmp; /* buffer holding the MC data multipled by OBMC weights */
uint8_t *mcscratch;
DECLARE_ALIGNED(16, uint8_t, obmc_weight)[3][MAX_BLOCKSIZE*MAX_BLOCKSIZE];
void (*put_pixels_tab[4])(uint8_t *dst, const uint8_t *src[5], int stride, int h);
void (*avg_pixels_tab[4])(uint8_t *dst, const uint8_t *src[5], int stride, int h);
void (*add_obmc)(uint16_t *dst, const uint8_t *src, int stride, const uint8_t *obmc_weight, int yblen);
dirac_weight_func weight_func;
dirac_biweight_func biweight_func;
DiracFrame *current_picture;
DiracFrame *ref_pics[2];
DiracFrame *ref_frames[MAX_REFERENCE_FRAMES+1];
DiracFrame *delay_frames[MAX_DELAY+1];
DiracFrame all_frames[MAX_FRAMES];
} DiracContext;
/**
* Dirac Specification ->
* Parse code values. 9.6.1 Table 9.1
*/
enum dirac_parse_code {
pc_seq_header = 0x00,
pc_eos = 0x10,
pc_aux_data = 0x20,
pc_padding = 0x30,
};
enum dirac_subband {
subband_ll = 0,
subband_hl = 1,
subband_lh = 2,
subband_hh = 3
};
static const uint8_t default_qmat[][4][4] = {
{ { 5, 3, 3, 0}, { 0, 4, 4, 1}, { 0, 5, 5, 2}, { 0, 6, 6, 3} },
{ { 4, 2, 2, 0}, { 0, 4, 4, 2}, { 0, 5, 5, 3}, { 0, 7, 7, 5} },
{ { 5, 3, 3, 0}, { 0, 4, 4, 1}, { 0, 5, 5, 2}, { 0, 6, 6, 3} },
{ { 8, 4, 4, 0}, { 0, 4, 4, 0}, { 0, 4, 4, 0}, { 0, 4, 4, 0} },
{ { 8, 4, 4, 0}, { 0, 4, 4, 0}, { 0, 4, 4, 0}, { 0, 4, 4, 0} },
{ { 0, 4, 4, 8}, { 0, 8, 8, 12}, { 0, 13, 13, 17}, { 0, 17, 17, 21} },
{ { 3, 1, 1, 0}, { 0, 4, 4, 2}, { 0, 6, 6, 5}, { 0, 9, 9, 7} },
};
static const int qscale_tab[MAX_QUANT+1] = {
4, 5, 6, 7, 8, 10, 11, 13,
16, 19, 23, 27, 32, 38, 45, 54,
64, 76, 91, 108, 128, 152, 181, 215,
256, 304, 362, 431, 512, 609, 724, 861,
1024, 1218, 1448, 1722, 2048, 2435, 2896, 3444,
4096, 4871, 5793, 6889, 8192, 9742, 11585, 13777,
16384, 19484, 23170, 27554, 32768, 38968, 46341, 55109,
65536, 77936
};
static const int qoffset_intra_tab[MAX_QUANT+1] = {
1, 2, 3, 4, 4, 5, 6, 7,
8, 10, 12, 14, 16, 19, 23, 27,
32, 38, 46, 54, 64, 76, 91, 108,
128, 152, 181, 216, 256, 305, 362, 431,
512, 609, 724, 861, 1024, 1218, 1448, 1722,
2048, 2436, 2897, 3445, 4096, 4871, 5793, 6889,
8192, 9742, 11585, 13777, 16384, 19484, 23171, 27555,
32768, 38968
};
static const int qoffset_inter_tab[MAX_QUANT+1] = {
1, 2, 2, 3, 3, 4, 4, 5,
6, 7, 9, 10, 12, 14, 17, 20,
24, 29, 34, 41, 48, 57, 68, 81,
96, 114, 136, 162, 192, 228, 272, 323,
384, 457, 543, 646, 768, 913, 1086, 1292,
1536, 1827, 2172, 2583, 3072, 3653, 4344, 5166,
6144, 7307, 8689, 10333, 12288, 14613, 17378, 20666,
24576, 29226
};
/* magic number division by 3 from schroedinger */
static inline int divide3(int x)
{
return ((x+1)*21845 + 10922) >> 16;
}
static DiracFrame *remove_frame(DiracFrame *framelist[], int picnum)
{
DiracFrame *remove_pic = NULL;
int i, remove_idx = -1;
for (i = 0; framelist[i]; i++)
if (framelist[i]->avframe.display_picture_number == picnum) {
remove_pic = framelist[i];
remove_idx = i;
}
if (remove_pic)
for (i = remove_idx; framelist[i]; i++)
framelist[i] = framelist[i+1];
return remove_pic;
}
static int add_frame(DiracFrame *framelist[], int maxframes, DiracFrame *frame)
{
int i;
for (i = 0; i < maxframes; i++)
if (!framelist[i]) {
framelist[i] = frame;
return 0;
}
return -1;
}
static int alloc_sequence_buffers(DiracContext *s)
{
int sbwidth = DIVRNDUP(s->source.width, 4);
int sbheight = DIVRNDUP(s->source.height, 4);
int i, w, h, top_padding;
/* todo: think more about this / use or set Plane here */
for (i = 0; i < 3; i++) {
int max_xblen = MAX_BLOCKSIZE >> (i ? s->chroma_x_shift : 0);
int max_yblen = MAX_BLOCKSIZE >> (i ? s->chroma_y_shift : 0);
w = s->source.width >> (i ? s->chroma_x_shift : 0);
h = s->source.height >> (i ? s->chroma_y_shift : 0);
/* we allocate the max we support here since num decompositions can
* change from frame to frame. Stride is aligned to 16 for SIMD, and
* 1<<MAX_DWT_LEVELS top padding to avoid if(y>0) in arith decoding
* MAX_BLOCKSIZE padding for MC: blocks can spill up to half of that
* on each side */
top_padding = FFMAX(1<<MAX_DWT_LEVELS, max_yblen/2);
w = FFALIGN(CALC_PADDING(w, MAX_DWT_LEVELS), 8); /* FIXME: Should this be 16 for SSE??? */
h = top_padding + CALC_PADDING(h, MAX_DWT_LEVELS) + max_yblen/2;
s->plane[i].idwt_buf_base = av_mallocz((w+max_xblen)*h * sizeof(IDWTELEM));
s->plane[i].idwt_tmp = av_malloc((w+16) * sizeof(IDWTELEM));
s->plane[i].idwt_buf = s->plane[i].idwt_buf_base + top_padding*w;
if (!s->plane[i].idwt_buf_base || !s->plane[i].idwt_tmp)
return AVERROR(ENOMEM);
}
w = s->source.width;
h = s->source.height;
/* fixme: allocate using real stride here */
s->sbsplit = av_malloc(sbwidth * sbheight);
s->blmotion = av_malloc(sbwidth * sbheight * 4 * sizeof(*s->blmotion));
s->edge_emu_buffer_base = av_malloc((w+64)*MAX_BLOCKSIZE);
s->mctmp = av_malloc((w+64+MAX_BLOCKSIZE) * (h*MAX_BLOCKSIZE) * sizeof(*s->mctmp));
s->mcscratch = av_malloc((w+64)*MAX_BLOCKSIZE);
if (!s->sbsplit || !s->blmotion)
return AVERROR(ENOMEM);
return 0;
}
static void free_sequence_buffers(DiracContext *s)
{
int i, j, k;
for (i = 0; i < MAX_FRAMES; i++) {
if (s->all_frames[i].avframe.data[0]) {
s->avctx->release_buffer(s->avctx, &s->all_frames[i].avframe);
memset(s->all_frames[i].interpolated, 0, sizeof(s->all_frames[i].interpolated));
}
for (j = 0; j < 3; j++)
for (k = 1; k < 4; k++)
av_freep(&s->all_frames[i].hpel_base[j][k]);
}
memset(s->ref_frames, 0, sizeof(s->ref_frames));
memset(s->delay_frames, 0, sizeof(s->delay_frames));
for (i = 0; i < 3; i++) {
av_freep(&s->plane[i].idwt_buf_base);
av_freep(&s->plane[i].idwt_tmp);
}
av_freep(&s->sbsplit);
av_freep(&s->blmotion);
av_freep(&s->edge_emu_buffer_base);
av_freep(&s->mctmp);
av_freep(&s->mcscratch);
}
static av_cold int dirac_decode_init(AVCodecContext *avctx)
{
DiracContext *s = avctx->priv_data;
s->avctx = avctx;
s->frame_number = -1;
if (avctx->flags&CODEC_FLAG_EMU_EDGE) {
av_log(avctx, AV_LOG_ERROR, "Edge emulation not supported!\n");
return AVERROR_PATCHWELCOME;
}
ff_dsputil_init(&s->dsp, avctx);
ff_diracdsp_init(&s->diracdsp);
return 0;
}
static void dirac_decode_flush(AVCodecContext *avctx)
{
DiracContext *s = avctx->priv_data;
free_sequence_buffers(s);
s->seen_sequence_header = 0;
s->frame_number = -1;
}
static av_cold int dirac_decode_end(AVCodecContext *avctx)
{
dirac_decode_flush(avctx);
return 0;
}
#define SIGN_CTX(x) (CTX_SIGN_ZERO + ((x) > 0) - ((x) < 0))
static inline void coeff_unpack_arith(DiracArith *c, int qfactor, int qoffset,
SubBand *b, IDWTELEM *buf, int x, int y)
{
int coeff, sign;
int sign_pred = 0;
int pred_ctx = CTX_ZPZN_F1;
/* Check if the parent subband has a 0 in the corresponding position */
if (b->parent)
pred_ctx += !!b->parent->ibuf[b->parent->stride * (y>>1) + (x>>1)] << 1;
if (b->orientation == subband_hl)
sign_pred = buf[-b->stride];
/* Determine if the pixel has only zeros in its neighbourhood */
if (x) {
pred_ctx += !(buf[-1] | buf[-b->stride] | buf[-1-b->stride]);
if (b->orientation == subband_lh)
sign_pred = buf[-1];
} else {
pred_ctx += !buf[-b->stride];
}
coeff = dirac_get_arith_uint(c, pred_ctx, CTX_COEFF_DATA);
if (coeff) {
coeff = (coeff * qfactor + qoffset + 2) >> 2;
sign = dirac_get_arith_bit(c, SIGN_CTX(sign_pred));
coeff = (coeff ^ -sign) + sign;
}
*buf = coeff;
}
static inline int coeff_unpack_golomb(GetBitContext *gb, int qfactor, int qoffset)
{
int sign, coeff;
coeff = svq3_get_ue_golomb(gb);
if (coeff) {
coeff = (coeff * qfactor + qoffset + 2) >> 2;
sign = get_bits1(gb);
coeff = (coeff ^ -sign) + sign;
}
return coeff;
}
/**
* Decode the coeffs in the rectangle defined by left, right, top, bottom
* [DIRAC_STD] 13.4.3.2 Codeblock unpacking loop. codeblock()
*/
static inline void codeblock(DiracContext *s, SubBand *b,
GetBitContext *gb, DiracArith *c,
int left, int right, int top, int bottom,
int blockcnt_one, int is_arith)
{
int x, y, zero_block;
int qoffset, qfactor;
IDWTELEM *buf;
/* check for any coded coefficients in this codeblock */
if (!blockcnt_one) {
if (is_arith)
zero_block = dirac_get_arith_bit(c, CTX_ZERO_BLOCK);
else
zero_block = get_bits1(gb);
if (zero_block)
return;
}
if (s->codeblock_mode && !(s->old_delta_quant && blockcnt_one)) {
int quant = b->quant;
if (is_arith)
quant += dirac_get_arith_int(c, CTX_DELTA_Q_F, CTX_DELTA_Q_DATA);
else
quant += dirac_get_se_golomb(gb);
if (quant < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid quant\n");
return;
}
b->quant = quant;
}
b->quant = FFMIN(b->quant, MAX_QUANT);
qfactor = qscale_tab[b->quant];
/* TODO: context pointer? */
if (!s->num_refs)
qoffset = qoffset_intra_tab[b->quant];
else
qoffset = qoffset_inter_tab[b->quant];
buf = b->ibuf + top * b->stride;
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
/* [DIRAC_STD] 13.4.4 Subband coefficients. coeff_unpack() */
if (is_arith)
coeff_unpack_arith(c, qfactor, qoffset, b, buf+x, x, y);
else
buf[x] = coeff_unpack_golomb(gb, qfactor, qoffset);
}
buf += b->stride;
}
}
/**
* Dirac Specification ->
* 13.3 intra_dc_prediction(band)
*/
static inline void intra_dc_prediction(SubBand *b)
{
IDWTELEM *buf = b->ibuf;
int x, y;
for (x = 1; x < b->width; x++)
buf[x] += buf[x-1];
buf += b->stride;
for (y = 1; y < b->height; y++) {
buf[0] += buf[-b->stride];
for (x = 1; x < b->width; x++) {
int pred = buf[x - 1] + buf[x - b->stride] + buf[x - b->stride-1];
buf[x] += divide3(pred);
}
buf += b->stride;
}
}
/**
* Dirac Specification ->
* 13.4.2 Non-skipped subbands. subband_coeffs()
*/
static av_always_inline void decode_subband_internal(DiracContext *s, SubBand *b, int is_arith)
{
int cb_x, cb_y, left, right, top, bottom;
DiracArith c;
GetBitContext gb;
int cb_width = s->codeblock[b->level + (b->orientation != subband_ll)].width;
int cb_height = s->codeblock[b->level + (b->orientation != subband_ll)].height;
int blockcnt_one = (cb_width + cb_height) == 2;
if (!b->length)
return;
init_get_bits(&gb, b->coeff_data, b->length*8);
if (is_arith)
ff_dirac_init_arith_decoder(&c, &gb, b->length);
top = 0;
for (cb_y = 0; cb_y < cb_height; cb_y++) {
bottom = (b->height * (cb_y+1)) / cb_height;
left = 0;
for (cb_x = 0; cb_x < cb_width; cb_x++) {
right = (b->width * (cb_x+1)) / cb_width;
codeblock(s, b, &gb, &c, left, right, top, bottom, blockcnt_one, is_arith);
left = right;
}
top = bottom;
}
if (b->orientation == subband_ll && s->num_refs == 0)
intra_dc_prediction(b);
}
static int decode_subband_arith(AVCodecContext *avctx, void *b)
{
DiracContext *s = avctx->priv_data;
decode_subband_internal(s, b, 1);
return 0;
}
static int decode_subband_golomb(AVCodecContext *avctx, void *arg)
{
DiracContext *s = avctx->priv_data;
SubBand **b = arg;
decode_subband_internal(s, *b, 0);
return 0;
}
/**
* Dirac Specification ->
* [DIRAC_STD] 13.4.1 core_transform_data()
*/
static void decode_component(DiracContext *s, int comp)
{
AVCodecContext *avctx = s->avctx;
SubBand *bands[3*MAX_DWT_LEVELS+1];
enum dirac_subband orientation;
int level, num_bands = 0;
/* Unpack all subbands at all levels. */
for (level = 0; level < s->wavelet_depth; level++) {
for (orientation = !!level; orientation < 4; orientation++) {
SubBand *b = &s->plane[comp].band[level][orientation];
bands[num_bands++] = b;
align_get_bits(&s->gb);
/* [DIRAC_STD] 13.4.2 subband() */
b->length = svq3_get_ue_golomb(&s->gb);
if (b->length) {
b->quant = svq3_get_ue_golomb(&s->gb);
align_get_bits(&s->gb);
b->coeff_data = s->gb.buffer + get_bits_count(&s->gb)/8;
b->length = FFMIN(b->length, FFMAX(get_bits_left(&s->gb)/8, 0));
skip_bits_long(&s->gb, b->length*8);
}
}
/* arithmetic coding has inter-level dependencies, so we can only execute one level at a time */
if (s->is_arith)
avctx->execute(avctx, decode_subband_arith, &s->plane[comp].band[level][!!level],
NULL, 4-!!level, sizeof(SubBand));
}
/* golomb coding has no inter-level dependencies, so we can execute all subbands in parallel */
if (!s->is_arith)
avctx->execute(avctx, decode_subband_golomb, bands, NULL, num_bands, sizeof(SubBand*));
}
/* [DIRAC_STD] 13.5.5.2 Luma slice subband data. luma_slice_band(level,orient,sx,sy) --> if b2 == NULL */
/* [DIRAC_STD] 13.5.5.3 Chroma slice subband data. chroma_slice_band(level,orient,sx,sy) --> if b2 != NULL */
static void lowdelay_subband(DiracContext *s, GetBitContext *gb, int quant,
int slice_x, int slice_y, int bits_end,
SubBand *b1, SubBand *b2)
{
int left = b1->width * slice_x / s->lowdelay.num_x;
int right = b1->width *(slice_x+1) / s->lowdelay.num_x;
int top = b1->height * slice_y / s->lowdelay.num_y;
int bottom = b1->height *(slice_y+1) / s->lowdelay.num_y;
int qfactor = qscale_tab[FFMIN(quant, MAX_QUANT)];
int qoffset = qoffset_intra_tab[FFMIN(quant, MAX_QUANT)];
IDWTELEM *buf1 = b1->ibuf + top * b1->stride;
IDWTELEM *buf2 = b2 ? b2->ibuf + top * b2->stride : NULL;
int x, y;
/* we have to constantly check for overread since the spec explictly
requires this, with the meaning that all remaining coeffs are set to 0 */
if (get_bits_count(gb) >= bits_end)
return;
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
buf1[x] = coeff_unpack_golomb(gb, qfactor, qoffset);
if (get_bits_count(gb) >= bits_end)
return;
if (buf2) {
buf2[x] = coeff_unpack_golomb(gb, qfactor, qoffset);
if (get_bits_count(gb) >= bits_end)
return;
}
}
buf1 += b1->stride;
if (buf2)
buf2 += b2->stride;
}
}
struct lowdelay_slice {
GetBitContext gb;
int slice_x;
int slice_y;
int bytes;
};
/**
* Dirac Specification ->
* 13.5.2 Slices. slice(sx,sy)
*/
static int decode_lowdelay_slice(AVCodecContext *avctx, void *arg)
{
DiracContext *s = avctx->priv_data;
struct lowdelay_slice *slice = arg;
GetBitContext *gb = &slice->gb;
enum dirac_subband orientation;
int level, quant, chroma_bits, chroma_end;
int quant_base = get_bits(gb, 7); /*[DIRAC_STD] qindex */
int length_bits = av_log2(8 * slice->bytes)+1;
int luma_bits = get_bits_long(gb, length_bits);
int luma_end = get_bits_count(gb) + FFMIN(luma_bits, get_bits_left(gb));
/* [DIRAC_STD] 13.5.5.2 luma_slice_band */
for (level = 0; level < s->wavelet_depth; level++)
for (orientation = !!level; orientation < 4; orientation++) {
quant = FFMAX(quant_base - s->lowdelay.quant[level][orientation], 0);
lowdelay_subband(s, gb, quant, slice->slice_x, slice->slice_y, luma_end,
&s->plane[0].band[level][orientation], NULL);
}
/* consume any unused bits from luma */
skip_bits_long(gb, get_bits_count(gb) - luma_end);
chroma_bits = 8*slice->bytes - 7 - length_bits - luma_bits;
chroma_end = get_bits_count(gb) + FFMIN(chroma_bits, get_bits_left(gb));
/* [DIRAC_STD] 13.5.5.3 chroma_slice_band */
for (level = 0; level < s->wavelet_depth; level++)
for (orientation = !!level; orientation < 4; orientation++) {
quant = FFMAX(quant_base - s->lowdelay.quant[level][orientation], 0);
lowdelay_subband(s, gb, quant, slice->slice_x, slice->slice_y, chroma_end,
&s->plane[1].band[level][orientation],
&s->plane[2].band[level][orientation]);
}
return 0;
}
/**
* Dirac Specification ->
* 13.5.1 low_delay_transform_data()
*/
static void decode_lowdelay(DiracContext *s)
{
AVCodecContext *avctx = s->avctx;
int slice_x, slice_y, bytes, bufsize;
const uint8_t *buf;
struct lowdelay_slice *slices;
int slice_num = 0;
slices = av_mallocz(s->lowdelay.num_x * s->lowdelay.num_y * sizeof(struct lowdelay_slice));
align_get_bits(&s->gb);
/*[DIRAC_STD] 13.5.2 Slices. slice(sx,sy) */
buf = s->gb.buffer + get_bits_count(&s->gb)/8;
bufsize = get_bits_left(&s->gb);
for (slice_y = 0; bufsize > 0 && slice_y < s->lowdelay.num_y; slice_y++)
for (slice_x = 0; bufsize > 0 && slice_x < s->lowdelay.num_x; slice_x++) {
bytes = (slice_num+1) * s->lowdelay.bytes.num / s->lowdelay.bytes.den
- slice_num * s->lowdelay.bytes.num / s->lowdelay.bytes.den;
slices[slice_num].bytes = bytes;
slices[slice_num].slice_x = slice_x;
slices[slice_num].slice_y = slice_y;
init_get_bits(&slices[slice_num].gb, buf, bufsize);
slice_num++;
buf += bytes;
bufsize -= bytes*8;
}
avctx->execute(avctx, decode_lowdelay_slice, slices, NULL, slice_num,
sizeof(struct lowdelay_slice)); /* [DIRAC_STD] 13.5.2 Slices */
intra_dc_prediction(&s->plane[0].band[0][0]); /* [DIRAC_STD] 13.3 intra_dc_prediction() */
intra_dc_prediction(&s->plane[1].band[0][0]); /* [DIRAC_STD] 13.3 intra_dc_prediction() */
intra_dc_prediction(&s->plane[2].band[0][0]); /* [DIRAC_STD] 13.3 intra_dc_prediction() */
av_free(slices);
}
static void init_planes(DiracContext *s)
{
int i, w, h, level, orientation;
for (i = 0; i < 3; i++) {
Plane *p = &s->plane[i];
p->width = s->source.width >> (i ? s->chroma_x_shift : 0);
p->height = s->source.height >> (i ? s->chroma_y_shift : 0);
p->idwt_width = w = CALC_PADDING(p->width , s->wavelet_depth);
p->idwt_height = h = CALC_PADDING(p->height, s->wavelet_depth);
p->idwt_stride = FFALIGN(p->idwt_width, 8);
for (level = s->wavelet_depth-1; level >= 0; level--) {
w = w>>1;
h = h>>1;
for (orientation = !!level; orientation < 4; orientation++) {
SubBand *b = &p->band[level][orientation];
b->ibuf = p->idwt_buf;
b->level = level;
b->stride = p->idwt_stride << (s->wavelet_depth - level);
b->width = w;
b->height = h;
b->orientation = orientation;
if (orientation & 1)
b->ibuf += w;
if (orientation > 1)
b->ibuf += b->stride>>1;
if (level)
b->parent = &p->band[level-1][orientation];
}
}
if (i > 0) {
p->xblen = s->plane[0].xblen >> s->chroma_x_shift;
p->yblen = s->plane[0].yblen >> s->chroma_y_shift;
p->xbsep = s->plane[0].xbsep >> s->chroma_x_shift;
p->ybsep = s->plane[0].ybsep >> s->chroma_y_shift;
}
p->xoffset = (p->xblen - p->xbsep)/2;
p->yoffset = (p->yblen - p->ybsep)/2;
}
}
/**
* Unpack the motion compensation parameters
* Dirac Specification ->
* 11.2 Picture prediction data. picture_prediction()
*/
static int dirac_unpack_prediction_parameters(DiracContext *s)
{
static const uint8_t default_blen[] = { 4, 12, 16, 24 };
static const uint8_t default_bsep[] = { 4, 8, 12, 16 };
GetBitContext *gb = &s->gb;
unsigned idx, ref;
align_get_bits(gb);
/* [DIRAC_STD] 11.2.2 Block parameters. block_parameters() */
/* Luma and Chroma are equal. 11.2.3 */
idx = svq3_get_ue_golomb(gb); /* [DIRAC_STD] index */
if (idx > 4) {
av_log(s->avctx, AV_LOG_ERROR, "Block prediction index too high\n");
return -1;
}
if (idx == 0) {
s->plane[0].xblen = svq3_get_ue_golomb(gb);
s->plane[0].yblen = svq3_get_ue_golomb(gb);
s->plane[0].xbsep = svq3_get_ue_golomb(gb);
s->plane[0].ybsep = svq3_get_ue_golomb(gb);
} else {
/*[DIRAC_STD] preset_block_params(index). Table 11.1 */
s->plane[0].xblen = default_blen[idx-1];
s->plane[0].yblen = default_blen[idx-1];
s->plane[0].xbsep = default_bsep[idx-1];
s->plane[0].ybsep = default_bsep[idx-1];
}
/*[DIRAC_STD] 11.2.4 motion_data_dimensions()
Calculated in function dirac_unpack_block_motion_data */
if (s->plane[0].xbsep < s->plane[0].xblen/2 || s->plane[0].ybsep < s->plane[0].yblen/2) {
av_log(s->avctx, AV_LOG_ERROR, "Block separation too small\n");
return -1;
}
if (s->plane[0].xbsep > s->plane[0].xblen || s->plane[0].ybsep > s->plane[0].yblen) {
av_log(s->avctx, AV_LOG_ERROR, "Block seperation greater than size\n");
return -1;
}
if (FFMAX(s->plane[0].xblen, s->plane[0].yblen) > MAX_BLOCKSIZE) {
av_log(s->avctx, AV_LOG_ERROR, "Unsupported large block size\n");
return -1;
}
/*[DIRAC_STD] 11.2.5 Motion vector precision. motion_vector_precision()
Read motion vector precision */
s->mv_precision = svq3_get_ue_golomb(gb);
if (s->mv_precision > 3) {
av_log(s->avctx, AV_LOG_ERROR, "MV precision finer than eighth-pel\n");
return -1;
}
/*[DIRAC_STD] 11.2.6 Global motion. global_motion()
Read the global motion compensation parameters */
s->globalmc_flag = get_bits1(gb);
if (s->globalmc_flag) {
memset(s->globalmc, 0, sizeof(s->globalmc));
/* [DIRAC_STD] pan_tilt(gparams) */
for (ref = 0; ref < s->num_refs; ref++) {
if (get_bits1(gb)) {
s->globalmc[ref].pan_tilt[0] = dirac_get_se_golomb(gb);
s->globalmc[ref].pan_tilt[1] = dirac_get_se_golomb(gb);
}
/* [DIRAC_STD] zoom_rotate_shear(gparams)
zoom/rotation/shear parameters */
if (get_bits1(gb)) {
s->globalmc[ref].zrs_exp = svq3_get_ue_golomb(gb);
s->globalmc[ref].zrs[0][0] = dirac_get_se_golomb(gb);
s->globalmc[ref].zrs[0][1] = dirac_get_se_golomb(gb);
s->globalmc[ref].zrs[1][0] = dirac_get_se_golomb(gb);
s->globalmc[ref].zrs[1][1] = dirac_get_se_golomb(gb);
} else {
s->globalmc[ref].zrs[0][0] = 1;
s->globalmc[ref].zrs[1][1] = 1;
}
/* [DIRAC_STD] perspective(gparams) */
if (get_bits1(gb)) {
s->globalmc[ref].perspective_exp = svq3_get_ue_golomb(gb);
s->globalmc[ref].perspective[0] = dirac_get_se_golomb(gb);
s->globalmc[ref].perspective[1] = dirac_get_se_golomb(gb);
}
}
}
/*[DIRAC_STD] 11.2.7 Picture prediction mode. prediction_mode()
Picture prediction mode, not currently used. */
if (svq3_get_ue_golomb(gb)) {
av_log(s->avctx, AV_LOG_ERROR, "Unknown picture prediction mode\n");
return -1;
}
/* [DIRAC_STD] 11.2.8 Reference picture weight. reference_picture_weights()
just data read, weight calculation will be done later on. */
s->weight_log2denom = 1;
s->weight[0] = 1;
s->weight[1] = 1;
if (get_bits1(gb)) {
s->weight_log2denom = svq3_get_ue_golomb(gb);
s->weight[0] = dirac_get_se_golomb(gb);
if (s->num_refs == 2)
s->weight[1] = dirac_get_se_golomb(gb);
}
return 0;
}
/**
* Dirac Specification ->
* 11.3 Wavelet transform data. wavelet_transform()
*/
static int dirac_unpack_idwt_params(DiracContext *s)
{
GetBitContext *gb = &s->gb;
int i, level;
unsigned tmp;
#define CHECKEDREAD(dst, cond, errmsg) \
tmp = svq3_get_ue_golomb(gb); \
if (cond) { \
av_log(s->avctx, AV_LOG_ERROR, errmsg); \
return -1; \
}\
dst = tmp;
align_get_bits(gb);
s->zero_res = s->num_refs ? get_bits1(gb) : 0;
if (s->zero_res)
return 0;
/*[DIRAC_STD] 11.3.1 Transform parameters. transform_parameters() */
CHECKEDREAD(s->wavelet_idx, tmp > 6, "wavelet_idx is too big\n")
CHECKEDREAD(s->wavelet_depth, tmp > MAX_DWT_LEVELS || tmp < 1, "invalid number of DWT decompositions\n")
if (!s->low_delay) {
/* Codeblock paramaters (core syntax only) */
if (get_bits1(gb)) {
for (i = 0; i <= s->wavelet_depth; i++) {
CHECKEDREAD(s->codeblock[i].width , tmp < 1, "codeblock width invalid\n")
CHECKEDREAD(s->codeblock[i].height, tmp < 1, "codeblock height invalid\n")
}
CHECKEDREAD(s->codeblock_mode, tmp > 1, "unknown codeblock mode\n")
} else
for (i = 0; i <= s->wavelet_depth; i++)
s->codeblock[i].width = s->codeblock[i].height = 1;
} else {
/* Slice parameters + quantization matrix*/
/*[DIRAC_STD] 11.3.4 Slice coding Parameters (low delay syntax only). slice_parameters() */
s->lowdelay.num_x = svq3_get_ue_golomb(gb);
s->lowdelay.num_y = svq3_get_ue_golomb(gb);
s->lowdelay.bytes.num = svq3_get_ue_golomb(gb);
s->lowdelay.bytes.den = svq3_get_ue_golomb(gb);
/* [DIRAC_STD] 11.3.5 Quantisation matrices (low-delay syntax). quant_matrix() */
if (get_bits1(gb)) {
av_log(s->avctx,AV_LOG_DEBUG,"Low Delay: Has Custom Quantization Matrix!\n");
/* custom quantization matrix */
s->lowdelay.quant[0][0] = svq3_get_ue_golomb(gb);
for (level = 0; level < s->wavelet_depth; level++) {
s->lowdelay.quant[level][1] = svq3_get_ue_golomb(gb);
s->lowdelay.quant[level][2] = svq3_get_ue_golomb(gb);
s->lowdelay.quant[level][3] = svq3_get_ue_golomb(gb);
}
} else {
/* default quantization matrix */
for (level = 0; level < s->wavelet_depth; level++)
for (i = 0; i < 4; i++) {
s->lowdelay.quant[level][i] = default_qmat[s->wavelet_idx][level][i];
/* haar with no shift differs for different depths */
if (s->wavelet_idx == 3)
s->lowdelay.quant[level][i] += 4*(s->wavelet_depth-1 - level);