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ffmpeg/libavcodec/diracdec.c
Andreas Rheinhardt a247ac640d avcodec: Constify AVCodecs 
Given that the AVCodec.next pointer has now been removed, most of the
AVCodecs are not modified at all any more and can therefore be made
const (as this patch does); the only exceptions are the very few codecs
for external libraries that have a init_static_data callback.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
2021-04-27 10:43:15 -03:00

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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
* Dirac Decoder
* @author Marco Gerards <marco@gnu.org>, David Conrad, Jordi Ortiz <nenjordi@gmail.com>
*/
#include "libavutil/mem_internal.h"
#include "libavutil/pixdesc.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "get_bits.h"
#include "bytestream.h"
#include "internal.h"
#include "golomb.h"
#include "dirac_arith.h"
#include "dirac_vlc.h"
#include "mpeg12data.h"
#include "libavcodec/mpegvideo.h"
#include "mpegvideoencdsp.h"
#include "dirac_dwt.h"
#include "dirac.h"
#include "diractab.h"
#include "diracdsp.h"
#include "videodsp.h"
/**
* 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 255 /* 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 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];
int reference;
} 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; /* in bytes */
int width;
int height;
int pshift;
int quant;
uint8_t *ibuf;
struct SubBand *parent;
/* for low delay */
unsigned length;
const uint8_t *coeff_data;
} SubBand;
typedef struct Plane {
DWTPlane idwt;
int width;
int height;
ptrdiff_t stride;
/* 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;
/* Used by Low Delay and High Quality profiles */
typedef struct DiracSlice {
GetBitContext gb;
int slice_x;
int slice_y;
int bytes;
} DiracSlice;
typedef struct DiracContext {
AVCodecContext *avctx;
MpegvideoEncDSPContext mpvencdsp;
VideoDSPContext vdsp;
DiracDSPContext diracdsp;
DiracVersionInfo version;
GetBitContext gb;
AVDiracSeqHeader seq;
int seen_sequence_header;
int64_t frame_number; /* number of the next frame to display */
Plane plane[3];
int chroma_x_shift;
int chroma_y_shift;
int bit_depth; /* bit depth */
int pshift; /* pixel shift = bit_depth > 8 */
int zero_res; /* zero residue flag */
int is_arith; /* whether coeffs use arith or golomb coding */
int core_syntax; /* use core syntax only */
int low_delay; /* use the low delay syntax */
int hq_picture; /* high quality picture, enables low_delay */
int ld_picture; /* use low delay picture, turns on low_delay */
int dc_prediction; /* has dc prediction */
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;
unsigned num_x; /* number of horizontal slices */
unsigned num_y; /* number of vertical slices */
uint8_t *thread_buf; /* Per-thread buffer for coefficient storage */
int threads_num_buf; /* Current # of buffers allocated */
int thread_buf_size; /* Each thread has a buffer this size */
DiracSlice *slice_params_buf;
int slice_params_num_buf;
struct {
unsigned width;
unsigned height;
} codeblock[MAX_DWT_LEVELS+1];
struct {
AVRational bytes; /* average bytes per slice */
uint8_t quant[MAX_DWT_LEVELS][4]; /* [DIRAC_STD] E.1 */
} lowdelay;
struct {
unsigned prefix_bytes;
uint64_t size_scaler;
} highquality;
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 multiplied by OBMC weights */
uint8_t *mcscratch;
int buffer_stride;
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;
enum dirac_subband {
subband_ll = 0,
subband_hl = 1,
subband_lh = 2,
subband_hh = 3,
subband_nb,
};
/* magic number division by 3 from schroedinger */
static inline int divide3(int x)
{
return (int)((x+1U)*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->seq.width, 4);
int sbheight = DIVRNDUP(s->seq.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->seq.width >> (i ? s->chroma_x_shift : 0);
h = s->seq.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_array((w+max_xblen), h * (2 << s->pshift));
s->plane[i].idwt.tmp = av_malloc_array((w+16), 2 << s->pshift);
s->plane[i].idwt.buf = s->plane[i].idwt.buf_base + (top_padding*w)*(2 << s->pshift);
if (!s->plane[i].idwt.buf_base || !s->plane[i].idwt.tmp)
return AVERROR(ENOMEM);
}
/* fixme: allocate using real stride here */
s->sbsplit = av_malloc_array(sbwidth, sbheight);
s->blmotion = av_malloc_array(sbwidth, sbheight * 16 * sizeof(*s->blmotion));
if (!s->sbsplit || !s->blmotion)
return AVERROR(ENOMEM);
return 0;
}
static int alloc_buffers(DiracContext *s, int stride)
{
int w = s->seq.width;
int h = s->seq.height;
av_assert0(stride >= w);
stride += 64;
if (s->buffer_stride >= stride)
return 0;
s->buffer_stride = 0;
av_freep(&s->edge_emu_buffer_base);
memset(s->edge_emu_buffer, 0, sizeof(s->edge_emu_buffer));
av_freep(&s->mctmp);
av_freep(&s->mcscratch);
s->edge_emu_buffer_base = av_malloc_array(stride, MAX_BLOCKSIZE);
s->mctmp = av_malloc_array((stride+MAX_BLOCKSIZE), (h+MAX_BLOCKSIZE) * sizeof(*s->mctmp));
s->mcscratch = av_malloc_array(stride, MAX_BLOCKSIZE);
if (!s->edge_emu_buffer_base || !s->mctmp || !s->mcscratch)
return AVERROR(ENOMEM);
s->buffer_stride = stride;
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]) {
av_frame_unref(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);
}
s->buffer_stride = 0;
av_freep(&s->sbsplit);
av_freep(&s->blmotion);
av_freep(&s->edge_emu_buffer_base);
av_freep(&s->mctmp);
av_freep(&s->mcscratch);
}
static AVOnce dirac_arith_init = AV_ONCE_INIT;
static av_cold int dirac_decode_init(AVCodecContext *avctx)
{
DiracContext *s = avctx->priv_data;
int i, ret;
s->avctx = avctx;
s->frame_number = -1;
s->thread_buf = NULL;
s->threads_num_buf = -1;
s->thread_buf_size = -1;
ff_diracdsp_init(&s->diracdsp);
ff_mpegvideoencdsp_init(&s->mpvencdsp, avctx);
ff_videodsp_init(&s->vdsp, 8);
for (i = 0; i < MAX_FRAMES; i++) {
s->all_frames[i].avframe = av_frame_alloc();
if (!s->all_frames[i].avframe) {
while (i > 0)
av_frame_free(&s->all_frames[--i].avframe);
return AVERROR(ENOMEM);
}
}
ret = ff_thread_once(&dirac_arith_init, ff_dirac_init_arith_tables);
if (ret != 0)
return AVERROR_UNKNOWN;
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)
{
DiracContext *s = avctx->priv_data;
int i;
dirac_decode_flush(avctx);
for (i = 0; i < MAX_FRAMES; i++)
av_frame_free(&s->all_frames[i].avframe);
av_freep(&s->thread_buf);
av_freep(&s->slice_params_buf);
return 0;
}
static inline int coeff_unpack_golomb(GetBitContext *gb, int qfactor, int qoffset)
{
int coeff = dirac_get_se_golomb(gb);
const unsigned sign = FFSIGN(coeff);
if (coeff)
coeff = sign*((sign * coeff * qfactor + qoffset) >> 2);
return coeff;
}
#define SIGN_CTX(x) (CTX_SIGN_ZERO + ((x) > 0) - ((x) < 0))
#define UNPACK_ARITH(n, type) \
static inline void coeff_unpack_arith_##n(DiracArith *c, int qfactor, int qoffset, \
SubBand *b, type *buf, int x, int y) \
{ \
int sign, sign_pred = 0, pred_ctx = CTX_ZPZN_F1; \
unsigned coeff; \
const int mstride = -(b->stride >> (1+b->pshift)); \
if (b->parent) { \
const type *pbuf = (type *)b->parent->ibuf; \
const int stride = b->parent->stride >> (1+b->parent->pshift); \
pred_ctx += !!pbuf[stride * (y>>1) + (x>>1)] << 1; \
} \
if (b->orientation == subband_hl) \
sign_pred = buf[mstride]; \
if (x) { \
pred_ctx += !(buf[-1] | buf[mstride] | buf[-1 + mstride]); \
if (b->orientation == subband_lh) \
sign_pred = buf[-1]; \
} else { \
pred_ctx += !buf[mstride]; \
} \
coeff = dirac_get_arith_uint(c, pred_ctx, CTX_COEFF_DATA); \
if (coeff) { \
coeff = (coeff * qfactor + qoffset) >> 2; \
sign = dirac_get_arith_bit(c, SIGN_CTX(sign_pred)); \
coeff = (coeff ^ -sign) + sign; \
} \
*buf = coeff; \
} \
UNPACK_ARITH(8, int16_t)
UNPACK_ARITH(10, int32_t)
/**
* Decode the coeffs in the rectangle defined by left, right, top, bottom
* [DIRAC_STD] 13.4.3.2 Codeblock unpacking loop. codeblock()
*/
static inline int 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;
uint8_t *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 0;
}
if (s->codeblock_mode && !(s->old_delta_quant && blockcnt_one)) {
int 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 > INT_MAX - b->quant || b->quant + quant < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid quant\n");
return AVERROR_INVALIDDATA;
}
b->quant += quant;
}
if (b->quant > (DIRAC_MAX_QUANT_INDEX - 1)) {
av_log(s->avctx, AV_LOG_ERROR, "Unsupported quant %d\n", b->quant);
b->quant = 0;
return AVERROR_INVALIDDATA;
}
qfactor = ff_dirac_qscale_tab[b->quant];
/* TODO: context pointer? */
if (!s->num_refs)
qoffset = ff_dirac_qoffset_intra_tab[b->quant] + 2;
else
qoffset = ff_dirac_qoffset_inter_tab[b->quant] + 2;
buf = b->ibuf + top * b->stride;
if (is_arith) {
for (y = top; y < bottom; y++) {
if (c->error)
return c->error;
for (x = left; x < right; x++) {
if (b->pshift) {
coeff_unpack_arith_10(c, qfactor, qoffset, b, (int32_t*)(buf)+x, x, y);
} else {
coeff_unpack_arith_8(c, qfactor, qoffset, b, (int16_t*)(buf)+x, x, y);
}
}
buf += b->stride;
}
} else {
for (y = top; y < bottom; y++) {
if (get_bits_left(gb) < 1)
return AVERROR_INVALIDDATA;
for (x = left; x < right; x++) {
int val = coeff_unpack_golomb(gb, qfactor, qoffset);
if (b->pshift) {
AV_WN32(&buf[4*x], val);
} else {
AV_WN16(&buf[2*x], val);
}
}
buf += b->stride;
}
}
return 0;
}
/**
* Dirac Specification ->
* 13.3 intra_dc_prediction(band)
*/
#define INTRA_DC_PRED(n, type) \
static inline void intra_dc_prediction_##n(SubBand *b) \
{ \
type *buf = (type*)b->ibuf; \
int x, y; \
\
for (x = 1; x < b->width; x++) \
buf[x] += buf[x-1]; \
buf += (b->stride >> (1+b->pshift)); \
\
for (y = 1; y < b->height; y++) { \
buf[0] += buf[-(b->stride >> (1+b->pshift))]; \
\
for (x = 1; x < b->width; x++) { \
int pred = buf[x - 1] + buf[x - (b->stride >> (1+b->pshift))] + buf[x - (b->stride >> (1+b->pshift))-1]; \
buf[x] += divide3(pred); \
} \
buf += (b->stride >> (1+b->pshift)); \
} \
} \
INTRA_DC_PRED(8, int16_t)
INTRA_DC_PRED(10, uint32_t)
/**
* Dirac Specification ->
* 13.4.2 Non-skipped subbands. subband_coeffs()
*/
static av_always_inline int 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;
int ret;
if (!b->length)
return 0;
init_get_bits8(&gb, b->coeff_data, b->length);
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+1LL)) / cb_height;
left = 0;
for (cb_x = 0; cb_x < cb_width; cb_x++) {
right = (b->width * (cb_x+1LL)) / cb_width;
ret = codeblock(s, b, &gb, &c, left, right, top, bottom, blockcnt_one, is_arith);
if (ret < 0)
return ret;
left = right;
}
top = bottom;
}
if (b->orientation == subband_ll && s->num_refs == 0) {
if (s->pshift) {
intra_dc_prediction_10(b);
} else {
intra_dc_prediction_8(b);
}
}
return 0;
}
static int decode_subband_arith(AVCodecContext *avctx, void *b)
{
DiracContext *s = avctx->priv_data;
return decode_subband_internal(s, b, 1);
}
static int decode_subband_golomb(AVCodecContext *avctx, void *arg)
{
DiracContext *s = avctx->priv_data;
SubBand **b = arg;
return decode_subband_internal(s, *b, 0);
}
/**
* Dirac Specification ->
* [DIRAC_STD] 13.4.1 core_transform_data()
*/
static int 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;
int ret[3*MAX_DWT_LEVELS+1];
int i;
int damaged_count = 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 = get_interleaved_ue_golomb(&s->gb);
if (b->length) {
b->quant = get_interleaved_ue_golomb(&s->gb);
if (b->quant > (DIRAC_MAX_QUANT_INDEX - 1)) {
av_log(s->avctx, AV_LOG_ERROR, "Unsupported quant %d\n", b->quant);
b->quant = 0;
return AVERROR_INVALIDDATA;
}
align_get_bits(&s->gb);
b->coeff_data = s->gb.buffer + get_bits_count(&s->gb)/8;
if (b->length > FFMAX(get_bits_left(&s->gb)/8, 0)) {
b->length = FFMAX(get_bits_left(&s->gb)/8, 0);
damaged_count ++;
}
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],
ret + 3*level + !!level, 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, ret, num_bands, sizeof(SubBand*));
for (i = 0; i < s->wavelet_depth * 3 + 1; i++) {
if (ret[i] < 0)
damaged_count++;
}
if (damaged_count > (s->wavelet_depth * 3 + 1) /2)
return AVERROR_INVALIDDATA;
return 0;
}
#define PARSE_VALUES(type, x, gb, ebits, buf1, buf2) \
type *buf = (type *)buf1; \
buf[x] = coeff_unpack_golomb(gb, qfactor, qoffset); \
if (get_bits_count(gb) >= ebits) \
return; \
if (buf2) { \
buf = (type *)buf2; \
buf[x] = coeff_unpack_golomb(gb, qfactor, qoffset); \
if (get_bits_count(gb) >= ebits) \
return; \
} \
static void decode_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->num_x;
int right = b1->width *(slice_x+1) / s->num_x;
int top = b1->height * slice_y / s->num_y;
int bottom = b1->height *(slice_y+1) / s->num_y;
int qfactor, qoffset;
uint8_t *buf1 = b1->ibuf + top * b1->stride;
uint8_t *buf2 = b2 ? b2->ibuf + top * b2->stride: NULL;
int x, y;
if (quant > (DIRAC_MAX_QUANT_INDEX - 1)) {
av_log(s->avctx, AV_LOG_ERROR, "Unsupported quant %d\n", quant);
return;
}
qfactor = ff_dirac_qscale_tab[quant];
qoffset = ff_dirac_qoffset_intra_tab[quant] + 2;
/* we have to constantly check for overread since the spec explicitly
requires this, with the meaning that all remaining coeffs are set to 0 */
if (get_bits_count(gb) >= bits_end)
return;
if (s->pshift) {
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
PARSE_VALUES(int32_t, x, gb, bits_end, buf1, buf2);
}
buf1 += b1->stride;
if (buf2)
buf2 += b2->stride;
}
}
else {
for (y = top; y < bottom; y++) {
for (x = left; x < right; x++) {
PARSE_VALUES(int16_t, x, gb, bits_end, buf1, buf2);
}
buf1 += b1->stride;
if (buf2)
buf2 += b2->stride;
}
}
}
/**
* Dirac Specification ->
* 13.5.2 Slices. slice(sx,sy)
*/
static int decode_lowdelay_slice(AVCodecContext *avctx, void *arg)
{
DiracContext *s = avctx->priv_data;
DiracSlice *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);
decode_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);
decode_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;
}
typedef struct SliceCoeffs {
int left;
int top;
int tot_h;
int tot_v;
int tot;
} SliceCoeffs;
static int subband_coeffs(DiracContext *s, int x, int y, int p,
SliceCoeffs c[MAX_DWT_LEVELS])
{
int level, coef = 0;
for (level = 0; level < s->wavelet_depth; level++) {
SliceCoeffs *o = &c[level];
SubBand *b = &s->plane[p].band[level][3]; /* orientation doens't matter */
o->top = b->height * y / s->num_y;
o->left = b->width * x / s->num_x;
o->tot_h = ((b->width * (x + 1)) / s->num_x) - o->left;
o->tot_v = ((b->height * (y + 1)) / s->num_y) - o->top;
o->tot = o->tot_h*o->tot_v;
coef += o->tot * (4 - !!level);
}
return coef;
}
/**
* VC-2 Specification ->
* 13.5.3 hq_slice(sx,sy)
*/
static int decode_hq_slice(DiracContext *s, DiracSlice *slice, uint8_t *tmp_buf)
{
int i, level, orientation, quant_idx;
int qfactor[MAX_DWT_LEVELS][4], qoffset[MAX_DWT_LEVELS][4];
GetBitContext *gb = &slice->gb;
SliceCoeffs coeffs_num[MAX_DWT_LEVELS];
skip_bits_long(gb, 8*s->highquality.prefix_bytes);
quant_idx = get_bits(gb, 8);
if (quant_idx > DIRAC_MAX_QUANT_INDEX - 1) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid quantization index - %i\n", quant_idx);
return AVERROR_INVALIDDATA;
}
/* Slice quantization (slice_quantizers() in the specs) */
for (level = 0; level < s->wavelet_depth; level++) {
for (orientation = !!level; orientation < 4; orientation++) {
const int quant = FFMAX(quant_idx - s->lowdelay.quant[level][orientation], 0);
qfactor[level][orientation] = ff_dirac_qscale_tab[quant];
qoffset[level][orientation] = ff_dirac_qoffset_intra_tab[quant] + 2;
}
}
/* Luma + 2 Chroma planes */
for (i = 0; i < 3; i++) {
int coef_num, coef_par, off = 0;
int64_t length = s->highquality.size_scaler*get_bits(gb, 8);
int64_t bits_end = get_bits_count(gb) + 8*length;
const uint8_t *addr = align_get_bits(gb);
if (length*8 > get_bits_left(gb)) {
av_log(s->avctx, AV_LOG_ERROR, "end too far away\n");
return AVERROR_INVALIDDATA;
}
coef_num = subband_coeffs(s, slice->slice_x, slice->slice_y, i, coeffs_num);
if (s->pshift)
coef_par = ff_dirac_golomb_read_32bit(addr, length,
tmp_buf, coef_num);
else
coef_par = ff_dirac_golomb_read_16bit(addr, length,
tmp_buf, coef_num);
if (coef_num > coef_par) {
const int start_b = coef_par * (1 << (s->pshift + 1));
const int end_b = coef_num * (1 << (s->pshift + 1));
memset(&tmp_buf[start_b], 0, end_b - start_b);
}
for (level = 0; level < s->wavelet_depth; level++) {
const SliceCoeffs *c = &coeffs_num[level];
for (orientation = !!level; orientation < 4; orientation++) {
const SubBand *b1 = &s->plane[i].band[level][orientation];
uint8_t *buf = b1->ibuf + c->top * b1->stride + (c->left << (s->pshift + 1));
/* Change to c->tot_h <= 4 for AVX2 dequantization */
const int qfunc = s->pshift + 2*(c->tot_h <= 2);
s->diracdsp.dequant_subband[qfunc](&tmp_buf[off], buf, b1->stride,
qfactor[level][orientation],
qoffset[level][orientation],
c->tot_v, c->tot_h);
off += c->tot << (s->pshift + 1);
}
}
skip_bits_long(gb, bits_end - get_bits_count(gb));
}
return 0;
}
static int decode_hq_slice_row(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)
{
int i;
DiracContext *s = avctx->priv_data;
DiracSlice *slices = ((DiracSlice *)arg) + s->num_x*jobnr;
uint8_t *thread_buf = &s->thread_buf[s->thread_buf_size*threadnr];
for (i = 0; i < s->num_x; i++)
decode_hq_slice(s, &slices[i], thread_buf);
return 0;
}
/**
* Dirac Specification ->
* 13.5.1 low_delay_transform_data()
*/
static int decode_lowdelay(DiracContext *s)
{
AVCodecContext *avctx = s->avctx;
int slice_x, slice_y, bufsize;
int64_t coef_buf_size, bytes = 0;
const uint8_t *buf;
DiracSlice *slices;
SliceCoeffs tmp[MAX_DWT_LEVELS];
int slice_num = 0;
if (s->slice_params_num_buf != (s->num_x * s->num_y)) {
s->slice_params_buf = av_realloc_f(s->slice_params_buf, s->num_x * s->num_y, sizeof(DiracSlice));
if (!s->slice_params_buf) {
av_log(s->avctx, AV_LOG_ERROR, "slice params buffer allocation failure\n");
s->slice_params_num_buf = 0;
return AVERROR(ENOMEM);
}
s->slice_params_num_buf = s->num_x * s->num_y;
}
slices = s->slice_params_buf;
/* 8 becacuse that's how much the golomb reader could overread junk data
* from another plane/slice at most, and 512 because SIMD */
coef_buf_size = subband_coeffs(s, s->num_x - 1, s->num_y - 1, 0, tmp) + 8;
coef_buf_size = (coef_buf_size << (1 + s->pshift)) + 512;
if (s->threads_num_buf != avctx->thread_count ||
s->thread_buf_size != coef_buf_size) {
s->threads_num_buf = avctx->thread_count;
s->thread_buf_size = coef_buf_size;
s->thread_buf = av_realloc_f(s->thread_buf, avctx->thread_count, s->thread_buf_size);
if (!s->thread_buf) {
av_log(s->avctx, AV_LOG_ERROR, "thread buffer allocation failure\n");
return AVERROR(ENOMEM);
}
}
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);
if (s->hq_picture) {
int i;
for (slice_y = 0; bufsize > 0 && slice_y < s->num_y; slice_y++) {
for (slice_x = 0; bufsize > 0 && slice_x < s->num_x; slice_x++) {
bytes = s->highquality.prefix_bytes + 1;
for (i = 0; i < 3; i++) {
if (bytes <= bufsize/8)
bytes += buf[bytes] * s->highquality.size_scaler + 1;
}
if (bytes >= INT_MAX || bytes*8 > bufsize) {
av_log(s->avctx, AV_LOG_ERROR, "too many bytes\n");
return AVERROR_INVALIDDATA;
}
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;
if (bufsize/8 >= bytes)
bufsize -= bytes*8;
else
bufsize = 0;
}
}
if (s->num_x*s->num_y != slice_num) {
av_log(s->avctx, AV_LOG_ERROR, "too few slices\n");
return AVERROR_INVALIDDATA;
}
avctx->execute2(avctx, decode_hq_slice_row, slices, NULL, s->num_y);
} else {
for (slice_y = 0; bufsize > 0 && slice_y < s->num_y; slice_y++) {
for (slice_x = 0; bufsize > 0 && slice_x < s->num_x; slice_x++) {
bytes = (slice_num+1) * (int64_t)s->lowdelay.bytes.num / s->lowdelay.bytes.den
- slice_num * (int64_t)s->lowdelay.bytes.num / s->lowdelay.bytes.den;
if (bytes >= INT_MAX || bytes*8 > bufsize) {
av_log(s->avctx, AV_LOG_ERROR, "too many bytes\n");
return AVERROR_INVALIDDATA;
}
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;
if (bufsize/8 >= bytes)
bufsize -= bytes*8;
else
bufsize = 0;
}
}
avctx->execute(avctx, decode_lowdelay_slice, slices, NULL, slice_num,
sizeof(DiracSlice)); /* [DIRAC_STD] 13.5.2 Slices */
}
if (s->dc_prediction) {
if (s->pshift) {
intra_dc_prediction_10(&s->plane[0].band[0][0]); /* [DIRAC_STD] 13.3 intra_dc_prediction() */
intra_dc_prediction_10(&s->plane[1].band[0][0]); /* [DIRAC_STD] 13.3 intra_dc_prediction() */
intra_dc_prediction_10(&s->plane[2].band[0][0]); /* [DIRAC_STD] 13.3 intra_dc_prediction() */
} else {
intra_dc_prediction_8(&s->plane[0].band[0][0]);
intra_dc_prediction_8(&s->plane[1].band[0][0]);
intra_dc_prediction_8(&s->plane[2].band[0][0]);
}
}
return 0;
}
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->seq.width >> (i ? s->chroma_x_shift : 0);
p->height = s->seq.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) << (1 + s->pshift);
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->pshift = s->pshift;
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 << (1+b->pshift);
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 };
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 = get_interleaved_ue_golomb(gb); /* [DIRAC_STD] index */
if (idx > 4) {
av_log(s->avctx, AV_LOG_ERROR, "Block prediction index too high\n");
return AVERROR_INVALIDDATA;
}
if (idx == 0) {
s->plane[0].xblen = get_interleaved_ue_golomb(gb);
s->plane[0].yblen = get_interleaved_ue_golomb(gb);
s->plane[0].xbsep = get_interleaved_ue_golomb(gb);
s->plane[0].ybsep = get_interleaved_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 = 4 * idx;
s->plane[0].ybsep = 4 * idx;
}
/*[DIRAC_STD] 11.2.4 motion_data_dimensions()
Calculated in function dirac_unpack_block_motion_data */
if (s->plane[0].xblen % (1 << s->chroma_x_shift) != 0 ||
s->plane[0].yblen % (1 << s->chroma_y_shift) != 0 ||
!s->plane[0].xblen || !s->plane[0].yblen) {
av_log(s->avctx, AV_LOG_ERROR,
"invalid x/y block length (%d/%d) for x/y chroma shift (%d/%d)\n",
s->plane[0].xblen, s->plane[0].yblen, s->chroma_x_shift, s->chroma_y_shift);
return AVERROR_INVALIDDATA;
}
if (!s->plane[0].xbsep || !s->plane[0].ybsep || 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 AVERROR_INVALIDDATA;
}
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 separation greater than size\n");
return AVERROR_INVALIDDATA;
}
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 AVERROR_PATCHWELCOME;
}
/*[DIRAC_STD] 11.2.5 Motion vector precision. motion_vector_precision()
Read motion vector precision */
s->mv_precision = get_interleaved_ue_golomb(gb);
if (s->mv_precision > 3) {
av_log(s->avctx, AV_LOG_ERROR, "MV precision finer than eighth-pel\n");
return AVERROR_INVALIDDATA;
}
/*[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 = get_interleaved_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 = get_interleaved_ue_golomb(gb);
s->globalmc[ref].perspective[0] = dirac_get_se_golomb(gb);
s->globalmc[ref].perspective[1] = dirac_get_se_golomb(gb);
}
if (s->globalmc[ref].perspective_exp + (uint64_t)s->globalmc[ref].zrs_exp > 30) {
return AVERROR_INVALIDDATA;
}
}
}
/*[DIRAC_STD] 11.2.7 Picture prediction mode. prediction_mode()
Picture prediction mode, not currently used. */
if (get_interleaved_ue_golomb(gb)) {
av_log(s->avctx, AV_LOG_ERROR, "Unknown picture prediction mode\n");
return AVERROR_INVALIDDATA;
}
/* [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 = get_interleaved_ue_golomb(gb);
if (s->weight_log2denom < 1 || s->weight_log2denom > 8) {
av_log(s->avctx, AV_LOG_ERROR, "weight_log2denom unsupported or invalid\n");
s->weight_log2denom = 1;
return AVERROR_INVALIDDATA;
}
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 = get_interleaved_ue_golomb(gb); \
if (cond) { \
av_log(s->avctx, AV_LOG_ERROR, errmsg); \
return AVERROR_INVALIDDATA; \
}\
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 parameters (core syntax only) */
if (get_bits1(gb)) {
for (i = 0; i <= s->wavelet_depth; i++) {
CHECKEDREAD(s->codeblock[i].width , tmp < 1 || tmp > (s->avctx->width >>s->wavelet_depth-i), "codeblock width invalid\n")
CHECKEDREAD(s->codeblock[i].height, tmp < 1 || tmp > (s->avctx->height>>s->wavelet_depth-i), "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 {
s->num_x = get_interleaved_ue_golomb(gb);
s->num_y = get_interleaved_ue_golomb(gb);
if (s->num_x * s->num_y == 0 || s->num_x * (uint64_t)s->num_y > INT_MAX ||
s->num_x * (uint64_t)s->avctx->width > INT_MAX ||
s->num_y * (uint64_t)s->avctx->height > INT_MAX ||
s->num_x > s->avctx->width ||
s->num_y > s->avctx->height
) {
av_log(s->avctx,AV_LOG_ERROR,"Invalid numx/y\n");
s->num_x = s->num_y = 0;
return AVERROR_INVALIDDATA;
}
if (s->ld_picture) {
s->lowdelay.bytes.num = get_interleaved_ue_golomb(gb);
s->lowdelay.bytes.den = get_interleaved_ue_golomb(gb);
if (s->lowdelay.bytes.den <= 0) {
av_log(s->avctx,AV_LOG_ERROR,"Invalid lowdelay.bytes.den\n");
return AVERROR_INVALIDDATA;
}
} else if (s->hq_picture) {
s->highquality.prefix_bytes = get_interleaved_ue_golomb(gb);
s->highquality.size_scaler = get_interleaved_ue_golomb(gb);
if (s->highquality.prefix_bytes >= INT_MAX / 8) {
av_log(s->avctx,AV_LOG_ERROR,"too many prefix bytes\n");
return AVERROR_INVALIDDATA;
}
}
/* [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 */
for (level = 0; level < s->wavelet_depth; level++) {
for (i = !!level; i < 4; i++) {
s->lowdelay.quant[level][i] = get_interleaved_ue_golomb(gb);
}
}
} else {
if (s->wavelet_depth > 4) {
av_log(s->avctx,AV_LOG_ERROR,"Mandatory custom low delay matrix missing for depth %d\n", s->wavelet_depth);
return AVERROR_INVALIDDATA;
}
/* default quantization matrix */
for (level = 0; level < s->wavelet_depth; level++)
for (i = 0; i < 4; i++) {
s->lowdelay.quant[level][i] = ff_dirac_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);
}
}
}
return 0;
}
static inline int pred_sbsplit(uint8_t *sbsplit, int stride, int x, int y)
{
static const uint8_t avgsplit[7] = { 0, 0, 1, 1, 1, 2, 2 };
if (!(x|y))
return 0;
else if (!y)
return sbsplit[-1];
else if (!x)
return sbsplit[-stride];
return avgsplit[sbsplit[-1] + sbsplit[-stride] + sbsplit[-stride-1]];
}
static inline int pred_block_mode(DiracBlock *block, int stride, int x, int y, int refmask)
{
int pred;
if (!(x|y))
return 0;
else if (!y)
return block[-1].ref & refmask;
else if (!x)
return block[-stride].ref & refmask;
/* return the majority */
pred = (block[-1].ref & refmask) + (block[-stride].ref & refmask) + (block[-stride-1].ref & refmask);
return (pred >> 1) & refmask;
}
static inline void pred_block_dc(DiracBlock *block, int stride, int x, int y)
{
int i, n = 0;
memset(block->u.dc, 0, sizeof(block->u.dc));
if (x && !(block[-1].ref & 3)) {
for (i = 0; i < 3; i++)
block->u.dc[i] += block[-1].u.dc[i];
n++;
}
if (y && !(block[-stride].ref & 3)) {
for (i = 0; i < 3; i++)
block->u.dc[i] += block[-stride].u.dc[i];
n++;
}
if (x && y && !(block[-1-stride].ref & 3)) {
for (i = 0; i < 3; i++)
block->u.dc[i] += block[-1-stride].u.dc[i];
n++;
}
if (n == 2) {
for (i = 0; i < 3; i++)
block->u.dc[i] = (block->u.dc[i]+1)>>1;
} else if (n == 3) {
for (i = 0; i < 3; i++)
block->u.dc[i] = divide3(block->u.dc[i]);
}
}
static inline void pred_mv(DiracBlock *block, int stride, int x, int y, int ref)
{
int16_t *pred[3];
int refmask = ref+1;
int mask = refmask | DIRAC_REF_MASK_GLOBAL; /* exclude gmc blocks */
int n = 0;
if (x && (block[-1].ref & mask) == refmask)
pred[n++] = block[-1].u.mv[ref];
if (y && (block[-stride].ref & mask) == refmask)
pred[n++] = block[-stride].u.mv[ref];
if (x && y && (block[-stride-1].ref & mask) == refmask)
pred[n++] = block[-stride-1].u.mv[ref];
switch (n) {
case 0:
block->u.mv[ref][0] = 0;
block->u.mv[ref][1] = 0;
break;
case 1:
block->u.mv[ref][0] = pred[0][0];
block->u.mv[ref][1] = pred[0][1];
break;
case 2:
block->u.mv[ref][0] = (pred[0][0] + pred[1][0] + 1) >> 1;
block->u.mv[ref][1] = (pred[0][1] + pred[1][1] + 1) >> 1;
break;
case 3:
block->u.mv[ref][0] = mid_pred(pred[0][0], pred[1][0], pred[2][0]);
block->u.mv[ref][1] = mid_pred(pred[0][1], pred[1][1], pred[2][1]);
break;
}
}
static void global_mv(DiracContext *s, DiracBlock *block, int x, int y, int ref)
{
int ez = s->globalmc[ref].zrs_exp;
int ep = s->globalmc[ref].perspective_exp;
int (*A)[2] = s->globalmc[ref].zrs;
int *b = s->globalmc[ref].pan_tilt;
int *c = s->globalmc[ref].perspective;
int64_t m = (1<<ep) - (c[0]*(int64_t)x + c[1]*(int64_t)y);
int64_t mx = m * (int64_t)((A[0][0] * (int64_t)x + A[0][1]*(int64_t)y) + (1LL<<ez) * b[0]);
int64_t my = m * (int64_t)((A[1][0] * (int64_t)x + A[1][1]*(int64_t)y) + (1LL<<ez) * b[1]);
block->u.mv[ref][0] = (mx + (1<<(ez+ep))) >> (ez+ep);
block->u.mv[ref][1] = (my + (1<<(ez+ep))) >> (ez+ep);
}
static void decode_block_params(DiracContext *s, DiracArith arith[8], DiracBlock *block,
int stride, int x, int y)
{
int i;
block->ref = pred_block_mode(block, stride, x, y, DIRAC_REF_MASK_REF1);
block->ref ^= dirac_get_arith_bit(arith, CTX_PMODE_REF1);
if (s->num_refs == 2) {
block->ref |= pred_block_mode(block, stride, x, y, DIRAC_REF_MASK_REF2);
block->ref ^= dirac_get_arith_bit(arith, CTX_PMODE_REF2) << 1;
}
if (!block->ref) {
pred_block_dc(block, stride, x, y);
for (i = 0; i < 3; i++)
block->u.dc[i] += (unsigned)dirac_get_arith_int(arith+1+i, CTX_DC_F1, CTX_DC_DATA);
return;
}
if (s->globalmc_flag) {
block->ref |= pred_block_mode(block, stride, x, y, DIRAC_REF_MASK_GLOBAL);
block->ref ^= dirac_get_arith_bit(arith, CTX_GLOBAL_BLOCK) << 2;
}
for (i = 0; i < s->num_refs; i++)
if (block->ref & (i+1)) {
if (block->ref & DIRAC_REF_MASK_GLOBAL) {
global_mv(s, block, x, y, i);
} else {
pred_mv(block, stride, x, y, i);
block->u.mv[i][0] += (unsigned)dirac_get_arith_int(arith + 4 + 2 * i, CTX_MV_F1, CTX_MV_DATA);
block->u.mv[i][1] += (unsigned)dirac_get_arith_int(arith + 5 + 2 * i, CTX_MV_F1, CTX_MV_DATA);
}
}
}
/**
* Copies the current block to the other blocks covered by the current superblock split mode
*/
static void propagate_block_data(DiracBlock *block, int stride, int size)
{
int x, y;
DiracBlock *dst = block;
for (x = 1; x < size; x++)
dst[x] = *block;
for (y = 1; y < size; y++) {
dst += stride;
for (x = 0; x < size; x++)
dst[x] = *block;
}
}
/**
* Dirac Specification ->
* 12. Block motion data syntax
*/
static int dirac_unpack_block_motion_data(DiracContext *s)
{
GetBitContext *gb = &s->gb;
uint8_t *sbsplit = s->sbsplit;
int i, x, y, q, p;
DiracArith arith[8];
align_get_bits(gb);
/* [DIRAC_STD] 11.2.4 and 12.2.1 Number of blocks and superblocks */
s->sbwidth = DIVRNDUP(s->seq.width, 4*s->plane[0].xbsep);
s->sbheight = DIVRNDUP(s->seq.height, 4*s->plane[0].ybsep);
s->blwidth = 4 * s->sbwidth;
s->blheight = 4 * s->sbheight;
/* [DIRAC_STD] 12.3.1 Superblock splitting modes. superblock_split_modes()
decode superblock split modes */
ff_dirac_init_arith_decoder(arith, gb, get_interleaved_ue_golomb(gb)); /* get_interleaved_ue_golomb(gb) is the length */
for (y = 0; y < s->sbheight; y++) {
for (x = 0; x < s->sbwidth; x++) {
unsigned int split = dirac_get_arith_uint(arith, CTX_SB_F1, CTX_SB_DATA);
if (split > 2)
return AVERROR_INVALIDDATA;
sbsplit[x] = (split + pred_sbsplit(sbsplit+x, s->sbwidth, x, y)) % 3;
}
sbsplit += s->sbwidth;
}
/* setup arith decoding */
ff_dirac_init_arith_decoder(arith, gb, get_interleaved_ue_golomb(gb));
for (i = 0; i < s->num_refs; i++) {
ff_dirac_init_arith_decoder(arith + 4 + 2 * i, gb, get_interleaved_ue_golomb(gb));
ff_dirac_init_arith_decoder(arith + 5 + 2 * i, gb, get_interleaved_ue_golomb(gb));
}
for (i = 0; i < 3; i++)
ff_dirac_init_arith_decoder(arith+1+i, gb, get_interleaved_ue_golomb(gb));
for (y = 0; y < s->sbheight; y++)
for (x = 0; x < s->sbwidth; x++) {
int blkcnt = 1 << s->sbsplit[y * s->sbwidth + x];
int step = 4 >> s->sbsplit[y * s->sbwidth + x];
for (q = 0; q < blkcnt; q++)
for (p = 0; p < blkcnt; p++) {
int bx = 4 * x + p*step;
int by = 4 * y + q*step;
DiracBlock *block = &s->blmotion[by*s->blwidth + bx];
decode_block_params(s, arith, block, s->blwidth, bx, by);
propagate_block_data(block, s->blwidth, step);
}
}
for (i = 0; i < 4 + 2*s->num_refs; i++) {
if (arith[i].error)
return arith[i].error;
}
return 0;
}
static int weight(int i, int blen, int offset)
{
#define ROLLOFF(i) offset == 1 ? ((i) ? 5 : 3) : \
(1 + (6*(i) + offset - 1) / (2*offset - 1))
if (i < 2*offset)
return ROLLOFF(i);
else if (i > blen-1 - 2*offset)
return ROLLOFF(blen-1 - i);
return 8;
}
static void init_obmc_weight_row(Plane *p, uint8_t *obmc_weight, int stride,
int left, int right, int wy)
{
int x;
for (x = 0; left && x < p->xblen >> 1; x++)
obmc_weight[x] = wy*8;
for (; x < p->xblen >> right; x++)
obmc_weight[x] = wy*weight(x, p->xblen, p->xoffset);
for (; x < p->xblen; x++)
obmc_weight[x] = wy*8;
for (; x < stride; x++)
obmc_weight[x] = 0;
}
static void init_obmc_weight(Plane *p, uint8_t *obmc_weight, int stride,
int left, int right, int top, int bottom)
{
int y;
for (y = 0; top && y < p->yblen >> 1; y++) {
init_obmc_weight_row(p, obmc_weight, stride, left, right, 8);
obmc_weight += stride;
}
for (; y < p->yblen >> bottom; y++) {
int wy = weight(y, p->yblen, p->yoffset);
init_obmc_weight_row(p, obmc_weight, stride, left, right, wy);
obmc_weight += stride;
}
for (; y < p->yblen; y++) {
init_obmc_weight_row(p, obmc_weight, stride, left, right, 8);
obmc_weight += stride;
}
}
static void init_obmc_weights(DiracContext *s, Plane *p, int by)
{
int top = !by;
int bottom = by == s->blheight-1;
/* don't bother re-initing for rows 2 to blheight-2, the weights don't change */
if (top || bottom || by == 1) {
init_obmc_weight(p, s->obmc_weight[0], MAX_BLOCKSIZE, 1, 0, top, bottom);
init_obmc_weight(p, s->obmc_weight[1], MAX_BLOCKSIZE, 0, 0, top, bottom);
init_obmc_weight(p, s->obmc_weight[2], MAX_BLOCKSIZE, 0, 1, top, bottom);
}
}
static const uint8_t epel_weights[4][4][4] = {
{{ 16, 0, 0, 0 },
{ 12, 4, 0, 0 },
{ 8, 8, 0, 0 },
{ 4, 12, 0, 0 }},
{{ 12, 0, 4, 0 },
{ 9, 3, 3, 1 },
{ 6, 6, 2, 2 },
{ 3, 9, 1, 3 }},
{{ 8, 0, 8, 0 },
{ 6, 2, 6, 2 },
{ 4, 4, 4, 4 },
{ 2, 6, 2, 6 }},
{{ 4, 0, 12, 0 },
{ 3, 1, 9, 3 },
{ 2, 2, 6, 6 },
{ 1, 3, 3, 9 }}
};
/**
* For block x,y, determine which of the hpel planes to do bilinear
* interpolation from and set src[] to the location in each hpel plane
* to MC from.
*
* @return the index of the put_dirac_pixels_tab function to use
* 0 for 1 plane (fpel,hpel), 1 for 2 planes (qpel), 2 for 4 planes (qpel), and 3 for epel
*/
static int mc_subpel(DiracContext *s, DiracBlock *block, const uint8_t *src[5],
int x, int y, int ref, int plane)
{
Plane *p = &s->plane[plane];
uint8_t **ref_hpel = s->ref_pics[ref]->hpel[plane];
int motion_x = block->u.mv[ref][0];
int motion_y = block->u.mv[ref][1];
int mx, my, i, epel, nplanes = 0;
if (plane) {
motion_x >>= s->chroma_x_shift;
motion_y >>= s->chroma_y_shift;
}
mx = motion_x & ~(-1U << s->mv_precision);
my = motion_y & ~(-1U << s->mv_precision);
motion_x >>= s->mv_precision;
motion_y >>= s->mv_precision;
/* normalize subpel coordinates to epel */
/* TODO: template this function? */
mx <<= 3 - s->mv_precision;
my <<= 3 - s->mv_precision;
x += motion_x;
y += motion_y;
epel = (mx|my)&1;
/* hpel position */
if (!((mx|my)&3)) {
nplanes = 1;
src[0] = ref_hpel[(my>>1)+(mx>>2)] + y*p->stride + x;
} else {
/* qpel or epel */
nplanes = 4;
for (i = 0; i < 4; i++)
src[i] = ref_hpel[i] + y*p->stride + x;
/* if we're interpolating in the right/bottom halves, adjust the planes as needed
we increment x/y because the edge changes for half of the pixels */
if (mx > 4) {
src[0] += 1;
src[2] += 1;
x++;
}
if (my > 4) {
src[0] += p->stride;
src[1] += p->stride;
y++;
}
/* hpel planes are:
[0]: F [1]: H
[2]: V [3]: C */
if (!epel) {
/* check if we really only need 2 planes since either mx or my is
a hpel position. (epel weights of 0 handle this there) */
if (!(mx&3)) {
/* mx == 0: average [0] and [2]
mx == 4: average [1] and [3] */
src[!mx] = src[2 + !!mx];
nplanes = 2;
} else if (!(my&3)) {
src[0] = src[(my>>1) ];
src[1] = src[(my>>1)+1];
nplanes = 2;
}
} else {
/* adjust the ordering if needed so the weights work */
if (mx > 4) {
FFSWAP(const uint8_t *, src[0], src[1]);
FFSWAP(const uint8_t *, src[2], src[3]);
}
if (my > 4) {
FFSWAP(const uint8_t *, src[0], src[2]);
FFSWAP(const uint8_t *, src[1], src[3]);
}
src[4] = epel_weights[my&3][mx&3];
}
}
/* fixme: v/h _edge_pos */
if (x + p->xblen > p->width +EDGE_WIDTH/2 ||
y + p->yblen > p->height+EDGE_WIDTH/2 ||
x < 0 || y < 0) {
for (i = 0; i < nplanes; i++) {
s->vdsp.emulated_edge_mc(s->edge_emu_buffer[i], src[i],
p->stride, p->stride,
p->xblen, p->yblen, x, y,
p->width+EDGE_WIDTH/2, p->height+EDGE_WIDTH/2);
src[i] = s->edge_emu_buffer[i];
}
}
return (nplanes>>1) + epel;
}
static void add_dc(uint16_t *dst, int dc, int stride,
uint8_t *obmc_weight, int xblen, int yblen)
{
int x, y;
dc += 128;
for (y = 0; y < yblen; y++) {
for (x = 0; x < xblen; x += 2) {
dst[x ] += dc * obmc_weight[x ];
dst[x+1] += dc * obmc_weight[x+1];
}
dst += stride;
obmc_weight += MAX_BLOCKSIZE;
}
}
static void block_mc(DiracContext *s, DiracBlock *block,
uint16_t *mctmp, uint8_t *obmc_weight,
int plane, int dstx, int dsty)
{
Plane *p = &s->plane[plane];
const uint8_t *src[5];
int idx;
switch (block->ref&3) {
case 0: /* DC */
add_dc(mctmp, block->u.dc[plane], p->stride, obmc_weight, p->xblen, p->yblen);
return;
case 1:
case 2:
idx = mc_subpel(s, block, src, dstx, dsty, (block->ref&3)-1, plane);
s->put_pixels_tab[idx](s->mcscratch, src, p->stride, p->yblen);
if (s->weight_func)
s->weight_func(s->mcscratch, p->stride, s->weight_log2denom,
s->weight[0] + s->weight[1], p->yblen);
break;
case 3:
idx = mc_subpel(s, block, src, dstx, dsty, 0, plane);
s->put_pixels_tab[idx](s->mcscratch, src, p->stride, p->yblen);
idx = mc_subpel(s, block, src, dstx, dsty, 1, plane);
if (s->biweight_func) {
/* fixme: +32 is a quick hack */
s->put_pixels_tab[idx](s->mcscratch + 32, src, p->stride, p->yblen);
s->biweight_func(s->mcscratch, s->mcscratch+32, p->stride, s->weight_log2denom,
s->weight[0], s->weight[1], p->yblen);
} else
s->avg_pixels_tab[idx](s->mcscratch, src, p->stride, p->yblen);
break;
}
s->add_obmc(mctmp, s->mcscratch, p->stride, obmc_weight, p->yblen);
}
static void mc_row(DiracContext *s, DiracBlock *block, uint16_t *mctmp, int plane, int dsty)
{
Plane *p = &s->plane[plane];
int x, dstx = p->xbsep - p->xoffset;
block_mc(s, block, mctmp, s->obmc_weight[0], plane, -p->xoffset, dsty);
mctmp += p->xbsep;
for (x = 1; x < s->blwidth-1; x++) {
block_mc(s, block+x, mctmp, s->obmc_weight[1], plane, dstx, dsty);
dstx += p->xbsep;
mctmp += p->xbsep;
}
block_mc(s, block+x, mctmp, s->obmc_weight[2], plane, dstx, dsty);
}
static void select_dsp_funcs(DiracContext *s, int width, int height, int xblen, int yblen)
{
int idx = 0;
if (xblen > 8)
idx = 1;
if (xblen > 16)
idx = 2;
memcpy(s->put_pixels_tab, s->diracdsp.put_dirac_pixels_tab[idx], sizeof(s->put_pixels_tab));
memcpy(s->avg_pixels_tab, s->diracdsp.avg_dirac_pixels_tab[idx], sizeof(s->avg_pixels_tab));
s->add_obmc = s->diracdsp.add_dirac_obmc[idx];
if (s->weight_log2denom > 1 || s->weight[0] != 1 || s->weight[1] != 1) {
s->weight_func = s->diracdsp.weight_dirac_pixels_tab[idx];
s->biweight_func = s->diracdsp.biweight_dirac_pixels_tab[idx];
} else {
s->weight_func = NULL;
s->biweight_func = NULL;
}
}
static int interpolate_refplane(DiracContext *s, DiracFrame *ref, int plane, int width, int height)
{
/* chroma allocates an edge of 8 when subsampled
which for 4:2:2 means an h edge of 16 and v edge of 8
just use 8 for everything for the moment */
int i, edge = EDGE_WIDTH/2;
ref->hpel[plane][0] = ref->avframe->data[plane];
s->mpvencdsp.draw_edges(ref->hpel[plane][0], ref->avframe->linesize[plane], width, height, edge, edge, EDGE_TOP | EDGE_BOTTOM); /* EDGE_TOP | EDGE_BOTTOM values just copied to make it build, this needs to be ensured */
/* no need for hpel if we only have fpel vectors */
if (!s->mv_precision)
return 0;
for (i = 1; i < 4; i++) {
if (!ref->hpel_base[plane][i])
ref->hpel_base[plane][i] = av_malloc((height+2*edge) * ref->avframe->linesize[plane] + 32);
if (!ref->hpel_base[plane][i]) {
return AVERROR(ENOMEM);
}
/* we need to be 16-byte aligned even for chroma */
ref->hpel[plane][i] = ref->hpel_base[plane][i] + edge*ref->avframe->linesize[plane] + 16;
}
if (!ref->interpolated[plane]) {
s->diracdsp.dirac_hpel_filter(ref->hpel[plane][1], ref->hpel[plane][2],
ref->hpel[plane][3], ref->hpel[plane][0],
ref->avframe->linesize[plane], width, height);
s->mpvencdsp.draw_edges(ref->hpel[plane][1], ref->avframe->linesize[plane], width, height, edge, edge, EDGE_TOP | EDGE_BOTTOM);
s->mpvencdsp.draw_edges(ref->hpel[plane][2], ref->avframe->linesize[plane], width, height, edge, edge, EDGE_TOP | EDGE_BOTTOM);
s->mpvencdsp.draw_edges(ref->hpel[plane][3], ref->avframe->linesize[plane], width, height, edge, edge, EDGE_TOP | EDGE_BOTTOM);
}
ref->interpolated[plane] = 1;
return 0;
}
/**
* Dirac Specification ->
* 13.0 Transform data syntax. transform_data()
*/
static int dirac_decode_frame_internal(DiracContext *s)
{
DWTContext d;
int y, i, comp, dsty;
int ret;
if (s->low_delay) {
/* [DIRAC_STD] 13.5.1 low_delay_transform_data() */
if (!s->hq_picture) {
for (comp = 0; comp < 3; comp++) {
Plane *p = &s->plane[comp];
memset(p->idwt.buf, 0, p->idwt.stride * p->idwt.height);
}
}
if (!s->zero_res) {
if ((ret = decode_lowdelay(s)) < 0)
return ret;
}
}
for (comp = 0; comp < 3; comp++) {
Plane *p = &s->plane[comp];
uint8_t *frame = s->current_picture->avframe->data[comp];
/* FIXME: small resolutions */
for (i = 0; i < 4; i++)
s->edge_emu_buffer[i] = s->edge_emu_buffer_base + i*FFALIGN(p->width, 16);
if (!s->zero_res && !s->low_delay)
{
memset(p->idwt.buf, 0, p->idwt.stride * p->idwt.height);
ret = decode_component(s, comp); /* [DIRAC_STD] 13.4.1 core_transform_data() */
if (ret < 0)
return ret;
}
ret = ff_spatial_idwt_init(&d, &p->idwt, s->wavelet_idx+2,
s->wavelet_depth, s->bit_depth);
if (ret < 0)
return ret;
if (!s->num_refs) { /* intra */
for (y = 0; y < p->height; y += 16) {
int idx = (s->bit_depth - 8) >> 1;
ff_spatial_idwt_slice2(&d, y+16); /* decode */
s->diracdsp.put_signed_rect_clamped[idx](frame + y*p->stride,
p->stride,
p->idwt.buf + y*p->idwt.stride,
p->idwt.stride, p->width, 16);
}
} else { /* inter */
int rowheight = p->ybsep*p->stride;
select_dsp_funcs(s, p->width, p->height, p->xblen, p->yblen);
for (i = 0; i < s->num_refs; i++) {
int ret = interpolate_refplane(s, s->ref_pics[i], comp, p->width, p->height);
if (ret < 0)
return ret;
}
memset(s->mctmp, 0, 4*p->yoffset*p->stride);
dsty = -p->yoffset;
for (y = 0; y < s->blheight; y++) {
int h = 0,
start = FFMAX(dsty, 0);
uint16_t *mctmp = s->mctmp + y*rowheight;
DiracBlock *blocks = s->blmotion + y*s->blwidth;
init_obmc_weights(s, p, y);
if (y == s->blheight-1 || start+p->ybsep > p->height)
h = p->height - start;
else
h = p->ybsep - (start - dsty);
if (h < 0)
break;
memset(mctmp+2*p->yoffset*p->stride, 0, 2*rowheight);
mc_row(s, blocks, mctmp, comp, dsty);
mctmp += (start - dsty)*p->stride + p->xoffset;
ff_spatial_idwt_slice2(&d, start + h); /* decode */
/* NOTE: add_rect_clamped hasn't been templated hence the shifts.
* idwt.stride is passed as pixels, not in bytes as in the rest of the decoder */
s->diracdsp.add_rect_clamped(frame + start*p->stride, mctmp, p->stride,
(int16_t*)(p->idwt.buf) + start*(p->idwt.stride >> 1), (p->idwt.stride >> 1), p->width, h);
dsty += p->ybsep;
}
}
}
return 0;
}
static int get_buffer_with_edge(AVCodecContext *avctx, AVFrame *f, int flags)
{
int ret, i;
int chroma_x_shift, chroma_y_shift;
ret = av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &chroma_x_shift,
&chroma_y_shift);
if (ret < 0)
return ret;
f->width = avctx->width + 2 * EDGE_WIDTH;
f->height = avctx->height + 2 * EDGE_WIDTH + 2;
ret = ff_get_buffer(avctx, f, flags);
if (ret < 0)
return ret;
for (i = 0; f->data[i]; i++) {
int offset = (EDGE_WIDTH >> (i && i<3 ? chroma_y_shift : 0)) *
f->linesize[i] + 32;
f->data[i] += offset;
}
f->width = avctx->width;
f->height = avctx->height;
return 0;
}
/**
* Dirac Specification ->
* 11.1.1 Picture Header. picture_header()
*/
static int dirac_decode_picture_header(DiracContext *s)
{
unsigned retire, picnum;
int i, j, ret;
int64_t refdist, refnum;
GetBitContext *gb = &s->gb;
/* [DIRAC_STD] 11.1.1 Picture Header. picture_header() PICTURE_NUM */
picnum = s->current_picture->avframe->display_picture_number = get_bits_long(gb, 32);
av_log(s->avctx,AV_LOG_DEBUG,"PICTURE_NUM: %d\n",picnum);
/* if this is the first keyframe after a sequence header, start our
reordering from here */
if (s->frame_number < 0)
s->frame_number = picnum;
s->ref_pics[0] = s->ref_pics[1] = NULL;
for (i = 0; i < s->num_refs; i++) {
refnum = (picnum + dirac_get_se_golomb(gb)) & 0xFFFFFFFF;
refdist = INT64_MAX;
/* find the closest reference to the one we want */
/* Jordi: this is needed if the referenced picture hasn't yet arrived */
for (j = 0; j < MAX_REFERENCE_FRAMES && refdist; j++)
if (s->ref_frames[j]
&& FFABS(s->ref_frames[j]->avframe->display_picture_number - refnum) < refdist) {
s->ref_pics[i] = s->ref_frames[j];
refdist = FFABS(s->ref_frames[j]->avframe->display_picture_number - refnum);
}
if (!s->ref_pics[i] || refdist)
av_log(s->avctx, AV_LOG_DEBUG, "Reference not found\n");
/* if there were no references at all, allocate one */
if (!s->ref_pics[i])
for (j = 0; j < MAX_FRAMES; j++)
if (!s->all_frames[j].avframe->data[0]) {
s->ref_pics[i] = &s->all_frames[j];
ret = get_buffer_with_edge(s->avctx, s->ref_pics[i]->avframe, AV_GET_BUFFER_FLAG_REF);
if (ret < 0)
return ret;
break;
}
if (!s->ref_pics[i]) {
av_log(s->avctx, AV_LOG_ERROR, "Reference could not be allocated\n");
return AVERROR_INVALIDDATA;
}
}
/* retire the reference frames that are not used anymore */
if (s->current_picture->reference) {
retire = (picnum + dirac_get_se_golomb(gb)) & 0xFFFFFFFF;
if (retire != picnum) {
DiracFrame *retire_pic = remove_frame(s->ref_frames, retire);
if (retire_pic)
retire_pic->reference &= DELAYED_PIC_REF;
else
av_log(s->avctx, AV_LOG_DEBUG, "Frame to retire not found\n");
}
/* if reference array is full, remove the oldest as per the spec */
while (add_frame(s->ref_frames, MAX_REFERENCE_FRAMES, s->current_picture)) {
av_log(s->avctx, AV_LOG_ERROR, "Reference frame overflow\n");
remove_frame(s->ref_frames, s->ref_frames[0]->avframe->display_picture_number)->reference &= DELAYED_PIC_REF;
}
}
if (s->num_refs) {
ret = dirac_unpack_prediction_parameters(s); /* [DIRAC_STD] 11.2 Picture Prediction Data. picture_prediction() */
if (ret < 0)
return ret;
ret = dirac_unpack_block_motion_data(s); /* [DIRAC_STD] 12. Block motion data syntax */
if (ret < 0)
return ret;
}
ret = dirac_unpack_idwt_params(s); /* [DIRAC_STD] 11.3 Wavelet transform data */
if (ret < 0)
return ret;
init_planes(s);
return 0;
}
static int get_delayed_pic(DiracContext *s, AVFrame *picture, int *got_frame)
{
DiracFrame *out = s->delay_frames[0];
int i, out_idx = 0;
int ret;
/* find frame with lowest picture number */
for (i = 1; s->delay_frames[i]; i++)
if (s->delay_frames[i]->avframe->display_picture_number < out->avframe->display_picture_number) {
out = s->delay_frames[i];
out_idx = i;
}
for (i = out_idx; s->delay_frames[i]; i++)
s->delay_frames[i] = s->delay_frames[i+1];
if (out) {
out->reference ^= DELAYED_PIC_REF;
if((ret = av_frame_ref(picture, out->avframe)) < 0)
return ret;
*got_frame = 1;
}
return 0;
}
/**
* Dirac Specification ->
* 9.6 Parse Info Header Syntax. parse_info()
* 4 byte start code + byte parse code + 4 byte size + 4 byte previous size
*/
#define DATA_UNIT_HEADER_SIZE 13
/* [DIRAC_STD] dirac_decode_data_unit makes reference to the while defined in 9.3
inside the function parse_sequence() */
static int dirac_decode_data_unit(AVCodecContext *avctx, const uint8_t *buf, int size)
{
DiracContext *s = avctx->priv_data;
DiracFrame *pic = NULL;
AVDiracSeqHeader *dsh;
int ret, i;
uint8_t parse_code;
unsigned tmp;
if (size < DATA_UNIT_HEADER_SIZE)
return AVERROR_INVALIDDATA;
parse_code = buf[4];
init_get_bits(&s->gb, &buf[13], 8*(size - DATA_UNIT_HEADER_SIZE));
if (parse_code == DIRAC_PCODE_SEQ_HEADER) {
if (s->seen_sequence_header)
return 0;
/* [DIRAC_STD] 10. Sequence header */
ret = av_dirac_parse_sequence_header(&dsh, buf + DATA_UNIT_HEADER_SIZE, size - DATA_UNIT_HEADER_SIZE, avctx);
if (ret < 0) {
av_log(avctx, AV_LOG_ERROR, "error parsing sequence header");
return ret;
}
if (CALC_PADDING((int64_t)dsh->width, MAX_DWT_LEVELS) * CALC_PADDING((int64_t)dsh->height, MAX_DWT_LEVELS) * 5LL > avctx->max_pixels)
ret = AVERROR(ERANGE);
if (ret >= 0)
ret = ff_set_dimensions(avctx, dsh->width, dsh->height);
if (ret < 0) {
av_freep(&dsh);
return ret;
}
ff_set_sar(avctx, dsh->sample_aspect_ratio);
avctx->pix_fmt = dsh->pix_fmt;
avctx->color_range = dsh->color_range;
avctx->color_trc = dsh->color_trc;
avctx->color_primaries = dsh->color_primaries;
avctx->colorspace = dsh->colorspace;
avctx->profile = dsh->profile;
avctx->level = dsh->level;
avctx->framerate = dsh->framerate;
s->bit_depth = dsh->bit_depth;
s->version.major = dsh->version.major;
s->version.minor = dsh->version.minor;
s->seq = *dsh;
av_freep(&dsh);
s->pshift = s->bit_depth > 8;
ret = av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt,
&s->chroma_x_shift,
&s->chroma_y_shift);
if (ret < 0)
return ret;
ret = alloc_sequence_buffers(s);
if (ret < 0)
return ret;
s->seen_sequence_header = 1;
} else if (parse_code == DIRAC_PCODE_END_SEQ) { /* [DIRAC_STD] End of Sequence */
free_sequence_buffers(s);
s->seen_sequence_header = 0;
} else if (parse_code == DIRAC_PCODE_AUX) {
if (buf[13] == 1) { /* encoder implementation/version */
int ver[3];
/* versions older than 1.0.8 don't store quant delta for
subbands with only one codeblock */
if (sscanf(buf+14, "Schroedinger %d.%d.%d", ver, ver+1, ver+2) == 3)
if (ver[0] == 1 && ver[1] == 0 && ver[2] <= 7)
s->old_delta_quant = 1;
}
} else if (parse_code & 0x8) { /* picture data unit */
if (!s->seen_sequence_header) {
av_log(avctx, AV_LOG_DEBUG, "Dropping frame without sequence header\n");
return AVERROR_INVALIDDATA;
}
/* find an unused frame */
for (i = 0; i < MAX_FRAMES; i++)
if (s->all_frames[i].avframe->data[0] == NULL)
pic = &s->all_frames[i];
if (!pic) {
av_log(avctx, AV_LOG_ERROR, "framelist full\n");
return AVERROR_INVALIDDATA;
}
av_frame_unref(pic->avframe);
/* [DIRAC_STD] Defined in 9.6.1 ... */
tmp = parse_code & 0x03; /* [DIRAC_STD] num_refs() */
if (tmp > 2) {
av_log(avctx, AV_LOG_ERROR, "num_refs of 3\n");
return AVERROR_INVALIDDATA;
}
s->num_refs = tmp;
s->is_arith = (parse_code & 0x48) == 0x08; /* [DIRAC_STD] using_ac() */
s->low_delay = (parse_code & 0x88) == 0x88; /* [DIRAC_STD] is_low_delay() */
s->core_syntax = (parse_code & 0x88) == 0x08; /* [DIRAC_STD] is_core_syntax() */
s->ld_picture = (parse_code & 0xF8) == 0xC8; /* [DIRAC_STD] is_ld_picture() */
s->hq_picture = (parse_code & 0xF8) == 0xE8; /* [DIRAC_STD] is_hq_picture() */
s->dc_prediction = (parse_code & 0x28) == 0x08; /* [DIRAC_STD] using_dc_prediction() */
pic->reference = (parse_code & 0x0C) == 0x0C; /* [DIRAC_STD] is_reference() */
pic->avframe->key_frame = s->num_refs == 0; /* [DIRAC_STD] is_intra() */
pic->avframe->pict_type = s->num_refs + 1; /* Definition of AVPictureType in avutil.h */
/* VC-2 Low Delay has a different parse code than the Dirac Low Delay */
if (s->version.minor == 2 && parse_code == 0x88)
s->ld_picture = 1;
if (s->low_delay && !(s->ld_picture || s->hq_picture) ) {
av_log(avctx, AV_LOG_ERROR, "Invalid low delay flag\n");
return AVERROR_INVALIDDATA;
}
if ((ret = get_buffer_with_edge(avctx, pic->avframe, (parse_code & 0x0C) == 0x0C ? AV_GET_BUFFER_FLAG_REF : 0)) < 0)
return ret;
s->current_picture = pic;
s->plane[0].stride = pic->avframe->linesize[0];
s->plane[1].stride = pic->avframe->linesize[1];
s->plane[2].stride = pic->avframe->linesize[2];
if (alloc_buffers(s, FFMAX3(FFABS(s->plane[0].stride), FFABS(s->plane[1].stride), FFABS(s->plane[2].stride))) < 0)
return AVERROR(ENOMEM);
/* [DIRAC_STD] 11.1 Picture parse. picture_parse() */
ret = dirac_decode_picture_header(s);
if (ret < 0)
return ret;
/* [DIRAC_STD] 13.0 Transform data syntax. transform_data() */
ret = dirac_decode_frame_internal(s);
if (ret < 0)
return ret;
}
return 0;
}
static int dirac_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *pkt)
{
DiracContext *s = avctx->priv_data;
AVFrame *picture = data;
uint8_t *buf = pkt->data;
int buf_size = pkt->size;
int i, buf_idx = 0;
int ret;
unsigned data_unit_size;
/* release unused frames */
for (i = 0; i < MAX_FRAMES; i++)
if (s->all_frames[i].avframe->data[0] && !s->all_frames[i].reference) {
av_frame_unref(s->all_frames[i].avframe);
memset(s->all_frames[i].interpolated, 0, sizeof(s->all_frames[i].interpolated));
}
s->current_picture = NULL;
*got_frame = 0;
/* end of stream, so flush delayed pics */
if (buf_size == 0)
return get_delayed_pic(s, (AVFrame *)data, got_frame);
for (;;) {
/*[DIRAC_STD] Here starts the code from parse_info() defined in 9.6
[DIRAC_STD] PARSE_INFO_PREFIX = "BBCD" as defined in ISO/IEC 646
BBCD start code search */
for (; buf_idx + DATA_UNIT_HEADER_SIZE < buf_size; buf_idx++) {
if (buf[buf_idx ] == 'B' && buf[buf_idx+1] == 'B' &&
buf[buf_idx+2] == 'C' && buf[buf_idx+3] == 'D')
break;
}
/* BBCD found or end of data */
if (buf_idx + DATA_UNIT_HEADER_SIZE >= buf_size)
break;
data_unit_size = AV_RB32(buf+buf_idx+5);
if (data_unit_size > buf_size - buf_idx || !data_unit_size) {
if(data_unit_size > buf_size - buf_idx)
av_log(s->avctx, AV_LOG_ERROR,
"Data unit with size %d is larger than input buffer, discarding\n",
data_unit_size);
buf_idx += 4;
continue;
}
/* [DIRAC_STD] dirac_decode_data_unit makes reference to the while defined in 9.3 inside the function parse_sequence() */
ret = dirac_decode_data_unit(avctx, buf+buf_idx, data_unit_size);
if (ret < 0)
{
av_log(s->avctx, AV_LOG_ERROR,"Error in dirac_decode_data_unit\n");
return ret;
}
buf_idx += data_unit_size;
}
if (!s->current_picture)
return buf_size;
if (s->current_picture->avframe->display_picture_number > s->frame_number) {
DiracFrame *delayed_frame = remove_frame(s->delay_frames, s->frame_number);
s->current_picture->reference |= DELAYED_PIC_REF;
if (add_frame(s->delay_frames, MAX_DELAY, s->current_picture)) {
int min_num = s->delay_frames[0]->avframe->display_picture_number;
/* Too many delayed frames, so we display the frame with the lowest pts */
av_log(avctx, AV_LOG_ERROR, "Delay frame overflow\n");
for (i = 1; s->delay_frames[i]; i++)
if (s->delay_frames[i]->avframe->display_picture_number < min_num)
min_num = s->delay_frames[i]->avframe->display_picture_number;
delayed_frame = remove_frame(s->delay_frames, min_num);
add_frame(s->delay_frames, MAX_DELAY, s->current_picture);
}
if (delayed_frame) {
delayed_frame->reference ^= DELAYED_PIC_REF;
if((ret=av_frame_ref(data, delayed_frame->avframe)) < 0)
return ret;
*got_frame = 1;
}
} else if (s->current_picture->avframe->display_picture_number == s->frame_number) {
/* The right frame at the right time :-) */
if((ret=av_frame_ref(data, s->current_picture->avframe)) < 0)
return ret;
*got_frame = 1;
}
if (*got_frame)
s->frame_number = picture->display_picture_number + 1LL;
return buf_idx;
}
const AVCodec ff_dirac_decoder = {
.name = "dirac",
.long_name = NULL_IF_CONFIG_SMALL("BBC Dirac VC-2"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_DIRAC,
.priv_data_size = sizeof(DiracContext),
.init = dirac_decode_init,
.close = dirac_decode_end,
.decode = dirac_decode_frame,
.capabilities = AV_CODEC_CAP_DELAY | AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_DR1,
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
.flush = dirac_decode_flush,
};
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