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ffmpeg/libavcodec/vp8.c
Ronald S. Bultje 3facfc99da Change function prototypes for width=8 inner and mbedge loopfilter functions 
so that it does both U and V planes at the same time. This will have speed
advantages when using SSE2 (or higher) optimizations, since we can do both
the U and V rows together in a single xmm register.

This also renames filter16 to filter16y and filter8 to filter8uv so that it's
more obvious what each function is used for.

Originally committed as revision 24337 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-07-19 21:18:04 +00:00

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/**
* VP8 compatible video decoder
*
* Copyright (C) 2010 David Conrad
* Copyright (C) 2010 Ronald S. Bultje
*
* 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
*/
#include "avcodec.h"
#include "vp56.h"
#include "vp8data.h"
#include "vp8dsp.h"
#include "h264pred.h"
#include "rectangle.h"
typedef struct {
uint8_t segment;
uint8_t skip;
// todo: make it possible to check for at least (i4x4 or split_mv)
// in one op. are others needed?
uint8_t mode;
uint8_t ref_frame;
uint8_t partitioning;
VP56mv mv;
VP56mv bmv[16];
} VP8Macroblock;
typedef struct {
AVCodecContext *avctx;
DSPContext dsp;
VP8DSPContext vp8dsp;
H264PredContext hpc;
vp8_mc_func put_pixels_tab[3][3][3];
AVFrame frames[4];
AVFrame *framep[4];
uint8_t *edge_emu_buffer;
VP56RangeCoder c; ///< header context, includes mb modes and motion vectors
int profile;
int mb_width; /* number of horizontal MB */
int mb_height; /* number of vertical MB */
int linesize;
int uvlinesize;
int keyframe;
int invisible;
int update_last; ///< update VP56_FRAME_PREVIOUS with the current one
int update_golden; ///< VP56_FRAME_NONE if not updated, or which frame to copy if so
int update_altref;
int deblock_filter;
/**
* If this flag is not set, all the probability updates
* are discarded after this frame is decoded.
*/
int update_probabilities;
/**
* All coefficients are contained in separate arith coding contexts.
* There can be 1, 2, 4, or 8 of these after the header context.
*/
int num_coeff_partitions;
VP56RangeCoder coeff_partition[8];
VP8Macroblock *macroblocks;
VP8Macroblock *macroblocks_base;
int mb_stride;
uint8_t *intra4x4_pred_mode;
uint8_t *intra4x4_pred_mode_base;
int b4_stride;
/**
* Cache of the top row needed for intra prediction
* 16 for luma, 8 for each chroma plane
*/
uint8_t (*top_border)[16+8+8];
/**
* For coeff decode, we need to know whether the above block had non-zero
* coefficients. This means for each macroblock, we need data for 4 luma
* blocks, 2 u blocks, 2 v blocks, and the luma dc block, for a total of 9
* per macroblock. We keep the last row in top_nnz.
*/
uint8_t (*top_nnz)[9];
DECLARE_ALIGNED(8, uint8_t, left_nnz)[9];
/**
* This is the index plus one of the last non-zero coeff
* for each of the blocks in the current macroblock.
* So, 0 -> no coeffs
* 1 -> dc-only (special transform)
* 2+-> full transform
*/
DECLARE_ALIGNED(16, uint8_t, non_zero_count_cache)[6][4];
DECLARE_ALIGNED(16, DCTELEM, block)[6][4][16];
int chroma_pred_mode; ///< 8x8c pred mode of the current macroblock
int mbskip_enabled;
int sign_bias[4]; ///< one state [0, 1] per ref frame type
/**
* Base parameters for segmentation, i.e. per-macroblock parameters.
* These must be kept unchanged even if segmentation is not used for
* a frame, since the values persist between interframes.
*/
struct {
int enabled;
int absolute_vals;
int update_map;
int8_t base_quant[4];
int8_t filter_level[4]; ///< base loop filter level
} segmentation;
/**
* Macroblocks can have one of 4 different quants in a frame when
* segmentation is enabled.
* If segmentation is disabled, only the first segment's values are used.
*/
struct {
// [0] - DC qmul [1] - AC qmul
int16_t luma_qmul[2];
int16_t luma_dc_qmul[2]; ///< luma dc-only block quant
int16_t chroma_qmul[2];
} qmat[4];
struct {
int simple;
int level;
int sharpness;
} filter;
struct {
int enabled; ///< whether each mb can have a different strength based on mode/ref
/**
* filter strength adjustment for the following macroblock modes:
* [0] - i4x4
* [1] - zero mv
* [2] - inter modes except for zero or split mv
* [3] - split mv
* i16x16 modes never have any adjustment
*/
int8_t mode[4];
/**
* filter strength adjustment for macroblocks that reference:
* [0] - intra / VP56_FRAME_CURRENT
* [1] - VP56_FRAME_PREVIOUS
* [2] - VP56_FRAME_GOLDEN
* [3] - altref / VP56_FRAME_GOLDEN2
*/
int8_t ref[4];
} lf_delta;
/**
* These are all of the updatable probabilities for binary decisions.
* They are only implictly reset on keyframes, making it quite likely
* for an interframe to desync if a prior frame's header was corrupt
* or missing outright!
*/
struct {
uint8_t segmentid[3];
uint8_t mbskip;
uint8_t intra;
uint8_t last;
uint8_t golden;
uint8_t pred16x16[4];
uint8_t pred8x8c[3];
uint8_t token[4][8][3][NUM_DCT_TOKENS-1];
uint8_t mvc[2][19];
} prob[2];
} VP8Context;
#define RL24(p) (AV_RL16(p) + ((p)[2] << 16))
static void vp8_decode_flush(AVCodecContext *avctx)
{
VP8Context *s = avctx->priv_data;
int i;
for (i = 0; i < 4; i++)
if (s->frames[i].data[0])
avctx->release_buffer(avctx, &s->frames[i]);
memset(s->framep, 0, sizeof(s->framep));
av_freep(&s->macroblocks_base);
av_freep(&s->intra4x4_pred_mode_base);
av_freep(&s->top_nnz);
av_freep(&s->edge_emu_buffer);
av_freep(&s->top_border);
s->macroblocks = NULL;
s->intra4x4_pred_mode = NULL;
}
static int update_dimensions(VP8Context *s, int width, int height)
{
int i;
if (avcodec_check_dimensions(s->avctx, width, height))
return AVERROR_INVALIDDATA;
vp8_decode_flush(s->avctx);
avcodec_set_dimensions(s->avctx, width, height);
s->mb_width = (s->avctx->coded_width +15) / 16;
s->mb_height = (s->avctx->coded_height+15) / 16;
// we allocate a border around the top/left of intra4x4 modes
// this is 4 blocks for intra4x4 to keep 4-byte alignment for fill_rectangle
s->mb_stride = s->mb_width+1;
s->b4_stride = 4*s->mb_stride;
s->macroblocks_base = av_mallocz(s->mb_stride*(s->mb_height+1)*sizeof(*s->macroblocks));
s->intra4x4_pred_mode_base = av_mallocz(s->b4_stride*(4*s->mb_height+1));
s->top_nnz = av_mallocz(s->mb_width*sizeof(*s->top_nnz));
s->top_border = av_mallocz((s->mb_width+1)*sizeof(*s->top_border));
if (!s->macroblocks_base || !s->intra4x4_pred_mode_base || !s->top_nnz || !s->top_border)
return AVERROR(ENOMEM);
s->macroblocks = s->macroblocks_base + 1 + s->mb_stride;
s->intra4x4_pred_mode = s->intra4x4_pred_mode_base + 4 + s->b4_stride;
memset(s->intra4x4_pred_mode_base, DC_PRED, s->b4_stride);
for (i = 0; i < 4*s->mb_height; i++)
s->intra4x4_pred_mode[i*s->b4_stride-1] = DC_PRED;
return 0;
}
static void parse_segment_info(VP8Context *s)
{
VP56RangeCoder *c = &s->c;
int i;
s->segmentation.update_map = vp8_rac_get(c);
if (vp8_rac_get(c)) { // update segment feature data
s->segmentation.absolute_vals = vp8_rac_get(c);
for (i = 0; i < 4; i++)
s->segmentation.base_quant[i] = vp8_rac_get_sint(c, 7);
for (i = 0; i < 4; i++)
s->segmentation.filter_level[i] = vp8_rac_get_sint(c, 6);
}
if (s->segmentation.update_map)
for (i = 0; i < 3; i++)
s->prob->segmentid[i] = vp8_rac_get(c) ? vp8_rac_get_uint(c, 8) : 255;
}
static void update_lf_deltas(VP8Context *s)
{
VP56RangeCoder *c = &s->c;
int i;
for (i = 0; i < 4; i++)
s->lf_delta.ref[i] = vp8_rac_get_sint(c, 6);
for (i = 0; i < 4; i++)
s->lf_delta.mode[i] = vp8_rac_get_sint(c, 6);
}
static int setup_partitions(VP8Context *s, const uint8_t *buf, int buf_size)
{
const uint8_t *sizes = buf;
int i;
s->num_coeff_partitions = 1 << vp8_rac_get_uint(&s->c, 2);
buf += 3*(s->num_coeff_partitions-1);
buf_size -= 3*(s->num_coeff_partitions-1);
if (buf_size < 0)
return -1;
for (i = 0; i < s->num_coeff_partitions-1; i++) {
int size = RL24(sizes + 3*i);
if (buf_size - size < 0)
return -1;
vp56_init_range_decoder(&s->coeff_partition[i], buf, size);
buf += size;
buf_size -= size;
}
vp56_init_range_decoder(&s->coeff_partition[i], buf, buf_size);
return 0;
}
static void get_quants(VP8Context *s)
{
VP56RangeCoder *c = &s->c;
int i, base_qi;
int yac_qi = vp8_rac_get_uint(c, 7);
int ydc_delta = vp8_rac_get_sint(c, 4);
int y2dc_delta = vp8_rac_get_sint(c, 4);
int y2ac_delta = vp8_rac_get_sint(c, 4);
int uvdc_delta = vp8_rac_get_sint(c, 4);
int uvac_delta = vp8_rac_get_sint(c, 4);
for (i = 0; i < 4; i++) {
if (s->segmentation.enabled) {
base_qi = s->segmentation.base_quant[i];
if (!s->segmentation.absolute_vals)
base_qi += yac_qi;
} else
base_qi = yac_qi;
s->qmat[i].luma_qmul[0] = vp8_dc_qlookup[av_clip(base_qi + ydc_delta , 0, 127)];
s->qmat[i].luma_qmul[1] = vp8_ac_qlookup[av_clip(base_qi , 0, 127)];
s->qmat[i].luma_dc_qmul[0] = 2 * vp8_dc_qlookup[av_clip(base_qi + y2dc_delta, 0, 127)];
s->qmat[i].luma_dc_qmul[1] = 155 * vp8_ac_qlookup[av_clip(base_qi + y2ac_delta, 0, 127)] / 100;
s->qmat[i].chroma_qmul[0] = vp8_dc_qlookup[av_clip(base_qi + uvdc_delta, 0, 127)];
s->qmat[i].chroma_qmul[1] = vp8_ac_qlookup[av_clip(base_qi + uvac_delta, 0, 127)];
s->qmat[i].luma_dc_qmul[1] = FFMAX(s->qmat[i].luma_dc_qmul[1], 8);
s->qmat[i].chroma_qmul[0] = FFMIN(s->qmat[i].chroma_qmul[0], 132);
}
}
/**
* Determine which buffers golden and altref should be updated with after this frame.
* The spec isn't clear here, so I'm going by my understanding of what libvpx does
*
* Intra frames update all 3 references
* Inter frames update VP56_FRAME_PREVIOUS if the update_last flag is set
* If the update (golden|altref) flag is set, it's updated with the current frame
* if update_last is set, and VP56_FRAME_PREVIOUS otherwise.
* If the flag is not set, the number read means:
* 0: no update
* 1: VP56_FRAME_PREVIOUS
* 2: update golden with altref, or update altref with golden
*/
static VP56Frame ref_to_update(VP8Context *s, int update, VP56Frame ref)
{
VP56RangeCoder *c = &s->c;
if (update)
return VP56_FRAME_CURRENT;
switch (vp8_rac_get_uint(c, 2)) {
case 1:
return VP56_FRAME_PREVIOUS;
case 2:
return (ref == VP56_FRAME_GOLDEN) ? VP56_FRAME_GOLDEN2 : VP56_FRAME_GOLDEN;
}
return VP56_FRAME_NONE;
}
static void update_refs(VP8Context *s)
{
VP56RangeCoder *c = &s->c;
int update_golden = vp8_rac_get(c);
int update_altref = vp8_rac_get(c);
s->update_golden = ref_to_update(s, update_golden, VP56_FRAME_GOLDEN);
s->update_altref = ref_to_update(s, update_altref, VP56_FRAME_GOLDEN2);
}
static int decode_frame_header(VP8Context *s, const uint8_t *buf, int buf_size)
{
VP56RangeCoder *c = &s->c;
int header_size, hscale, vscale, i, j, k, l, ret;
int width = s->avctx->width;
int height = s->avctx->height;
s->keyframe = !(buf[0] & 1);
s->profile = (buf[0]>>1) & 7;
s->invisible = !(buf[0] & 0x10);
header_size = RL24(buf) >> 5;
buf += 3;
buf_size -= 3;
if (s->profile > 3)
av_log(s->avctx, AV_LOG_WARNING, "Unknown profile %d\n", s->profile);
if (!s->profile)
memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_epel_pixels_tab, sizeof(s->put_pixels_tab));
else // profile 1-3 use bilinear, 4+ aren't defined so whatever
memcpy(s->put_pixels_tab, s->vp8dsp.put_vp8_bilinear_pixels_tab, sizeof(s->put_pixels_tab));
if (header_size > buf_size - 7*s->keyframe) {
av_log(s->avctx, AV_LOG_ERROR, "Header size larger than data provided\n");
return AVERROR_INVALIDDATA;
}
if (s->keyframe) {
if (RL24(buf) != 0x2a019d) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid start code 0x%x\n", RL24(buf));
return AVERROR_INVALIDDATA;
}
width = AV_RL16(buf+3) & 0x3fff;
height = AV_RL16(buf+5) & 0x3fff;
hscale = buf[4] >> 6;
vscale = buf[6] >> 6;
buf += 7;
buf_size -= 7;
if (hscale || vscale)
av_log_missing_feature(s->avctx, "Upscaling", 1);
s->update_golden = s->update_altref = VP56_FRAME_CURRENT;
memcpy(s->prob->token , vp8_token_default_probs , sizeof(s->prob->token));
memcpy(s->prob->pred16x16, vp8_pred16x16_prob_inter, sizeof(s->prob->pred16x16));
memcpy(s->prob->pred8x8c , vp8_pred8x8c_prob_inter , sizeof(s->prob->pred8x8c));
memcpy(s->prob->mvc , vp8_mv_default_prob , sizeof(s->prob->mvc));
memset(&s->segmentation, 0, sizeof(s->segmentation));
}
if (!s->macroblocks_base || /* first frame */
width != s->avctx->width || height != s->avctx->height) {
if ((ret = update_dimensions(s, width, height) < 0))
return ret;
}
vp56_init_range_decoder(c, buf, header_size);
buf += header_size;
buf_size -= header_size;
if (s->keyframe) {
if (vp8_rac_get(c))
av_log(s->avctx, AV_LOG_WARNING, "Unspecified colorspace\n");
vp8_rac_get(c); // whether we can skip clamping in dsp functions
}
if ((s->segmentation.enabled = vp8_rac_get(c)))
parse_segment_info(s);
else
s->segmentation.update_map = 0; // FIXME: move this to some init function?
s->filter.simple = vp8_rac_get(c);
s->filter.level = vp8_rac_get_uint(c, 6);
s->filter.sharpness = vp8_rac_get_uint(c, 3);
if ((s->lf_delta.enabled = vp8_rac_get(c)))
if (vp8_rac_get(c))
update_lf_deltas(s);
if (setup_partitions(s, buf, buf_size)) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid partitions\n");
return AVERROR_INVALIDDATA;
}
get_quants(s);
if (!s->keyframe) {
update_refs(s);
s->sign_bias[VP56_FRAME_GOLDEN] = vp8_rac_get(c);
s->sign_bias[VP56_FRAME_GOLDEN2 /* altref */] = vp8_rac_get(c);
}
// if we aren't saving this frame's probabilities for future frames,
// make a copy of the current probabilities
if (!(s->update_probabilities = vp8_rac_get(c)))
s->prob[1] = s->prob[0];
s->update_last = s->keyframe || vp8_rac_get(c);
for (i = 0; i < 4; i++)
for (j = 0; j < 8; j++)
for (k = 0; k < 3; k++)
for (l = 0; l < NUM_DCT_TOKENS-1; l++)
if (vp56_rac_get_prob(c, vp8_token_update_probs[i][j][k][l]))
s->prob->token[i][j][k][l] = vp8_rac_get_uint(c, 8);
if ((s->mbskip_enabled = vp8_rac_get(c)))
s->prob->mbskip = vp8_rac_get_uint(c, 8);
if (!s->keyframe) {
s->prob->intra = vp8_rac_get_uint(c, 8);
s->prob->last = vp8_rac_get_uint(c, 8);
s->prob->golden = vp8_rac_get_uint(c, 8);
if (vp8_rac_get(c))
for (i = 0; i < 4; i++)
s->prob->pred16x16[i] = vp8_rac_get_uint(c, 8);
if (vp8_rac_get(c))
for (i = 0; i < 3; i++)
s->prob->pred8x8c[i] = vp8_rac_get_uint(c, 8);
// 17.2 MV probability update
for (i = 0; i < 2; i++)
for (j = 0; j < 19; j++)
if (vp56_rac_get_prob(c, vp8_mv_update_prob[i][j]))
s->prob->mvc[i][j] = vp8_rac_get_nn(c);
}
return 0;
}
static inline void clamp_mv(VP8Context *s, VP56mv *dst, const VP56mv *src,
int mb_x, int mb_y)
{
#define MARGIN (16 << 2)
dst->x = av_clip(src->x, -((mb_x << 6) + MARGIN),
((s->mb_width - 1 - mb_x) << 6) + MARGIN);
dst->y = av_clip(src->y, -((mb_y << 6) + MARGIN),
((s->mb_height - 1 - mb_y) << 6) + MARGIN);
}
static void find_near_mvs(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
VP56mv near[2], VP56mv *best, int cnt[4])
{
VP8Macroblock *mb_edge[3] = { mb - s->mb_stride /* top */,
mb - 1 /* left */,
mb - s->mb_stride - 1 /* top-left */ };
enum { EDGE_TOP, EDGE_LEFT, EDGE_TOPLEFT };
VP56mv near_mv[4] = {{ 0 }};
enum { CNT_ZERO, CNT_NEAREST, CNT_NEAR, CNT_SPLITMV };
int idx = CNT_ZERO, n;
int best_idx = CNT_ZERO;
/* Process MB on top, left and top-left */
for (n = 0; n < 3; n++) {
VP8Macroblock *edge = mb_edge[n];
if (edge->ref_frame != VP56_FRAME_CURRENT) {
if (edge->mv.x | edge->mv.y) {
VP56mv tmp = edge->mv;
if (s->sign_bias[mb->ref_frame] != s->sign_bias[edge->ref_frame]) {
tmp.x *= -1;
tmp.y *= -1;
}
if ((tmp.x ^ near_mv[idx].x) | (tmp.y ^ near_mv[idx].y))
near_mv[++idx] = tmp;
cnt[idx] += 1 + (n != 2);
} else
cnt[CNT_ZERO] += 1 + (n != 2);
}
}
/* If we have three distinct MV's, merge first and last if they're the same */
if (cnt[CNT_SPLITMV] &&
!((near_mv[1+EDGE_TOP].x ^ near_mv[1+EDGE_TOPLEFT].x) |
(near_mv[1+EDGE_TOP].y ^ near_mv[1+EDGE_TOPLEFT].y)))
cnt[CNT_NEAREST] += 1;
cnt[CNT_SPLITMV] = ((mb_edge[EDGE_LEFT]->mode == VP8_MVMODE_SPLIT) +
(mb_edge[EDGE_TOP]->mode == VP8_MVMODE_SPLIT)) * 2 +
(mb_edge[EDGE_TOPLEFT]->mode == VP8_MVMODE_SPLIT);
/* Swap near and nearest if necessary */
if (cnt[CNT_NEAR] > cnt[CNT_NEAREST]) {
FFSWAP(int, cnt[CNT_NEAREST], cnt[CNT_NEAR]);
FFSWAP(VP56mv, near_mv[CNT_NEAREST], near_mv[CNT_NEAR]);
}
/* Choose the best mv out of 0,0 and the nearest mv */
if (cnt[CNT_NEAREST] >= cnt[CNT_ZERO])
best_idx = CNT_NEAREST;
clamp_mv(s, best, &near_mv[best_idx], mb_x, mb_y);
near[0] = near_mv[CNT_NEAREST];
near[1] = near_mv[CNT_NEAR];
}
/**
* Motion vector coding, 17.1.
*/
static int read_mv_component(VP56RangeCoder *c, const uint8_t *p)
{
int x = 0;
if (vp56_rac_get_prob(c, p[0])) {
int i;
for (i = 0; i < 3; i++)
x += vp56_rac_get_prob(c, p[9 + i]) << i;
for (i = 9; i > 3; i--)
x += vp56_rac_get_prob(c, p[9 + i]) << i;
if (!(x & 0xFFF0) || vp56_rac_get_prob(c, p[12]))
x += 8;
} else
x = vp8_rac_get_tree(c, vp8_small_mvtree, &p[2]);
return (x && vp56_rac_get_prob(c, p[1])) ? -x : x;
}
static const uint8_t *get_submv_prob(const VP56mv *left, const VP56mv *top)
{
int l_is_zero = !(left->x | left->y);
int t_is_zero = !(top->x | top->y);
int equal = !((left->x ^ top->x) | (left->y ^ top->y));
if (equal)
return l_is_zero ? vp8_submv_prob[4] : vp8_submv_prob[3];
if (t_is_zero)
return vp8_submv_prob[2];
return l_is_zero ? vp8_submv_prob[1] : vp8_submv_prob[0];
}
/**
* Split motion vector prediction, 16.4.
* @returns the number of motion vectors parsed (2, 4 or 16)
*/
static int decode_splitmvs(VP8Context *s, VP56RangeCoder *c,
VP8Macroblock *mb, VP56mv *base_mv)
{
int part_idx = mb->partitioning =
vp8_rac_get_tree(c, vp8_mbsplit_tree, vp8_mbsplit_prob);
int n, num = vp8_mbsplit_count[part_idx];
const uint8_t *mbsplits = vp8_mbsplits[part_idx],
*firstidx = vp8_mbfirstidx[part_idx];
for (n = 0; n < num; n++) {
int k = firstidx[n];
const VP56mv *left, *above;
const uint8_t *submv_prob;
if (!(k & 3)) {
VP8Macroblock *left_mb = &mb[-1];
left = &left_mb->bmv[vp8_mbsplits[left_mb->partitioning][k + 3]];
} else
left = &mb->bmv[mbsplits[k - 1]];
if (k <= 3) {
VP8Macroblock *above_mb = &mb[-s->mb_stride];
above = &above_mb->bmv[vp8_mbsplits[above_mb->partitioning][k + 12]];
} else
above = &mb->bmv[mbsplits[k - 4]];
submv_prob = get_submv_prob(left, above);
switch (vp8_rac_get_tree(c, vp8_submv_ref_tree, submv_prob)) {
case VP8_SUBMVMODE_NEW4X4:
mb->bmv[n].y = base_mv->y + read_mv_component(c, s->prob->mvc[0]);
mb->bmv[n].x = base_mv->x + read_mv_component(c, s->prob->mvc[1]);
break;
case VP8_SUBMVMODE_ZERO4X4:
mb->bmv[n].x = 0;
mb->bmv[n].y = 0;
break;
case VP8_SUBMVMODE_LEFT4X4:
mb->bmv[n] = *left;
break;
case VP8_SUBMVMODE_TOP4X4:
mb->bmv[n] = *above;
break;
}
}
return num;
}
static inline void decode_intra4x4_modes(VP56RangeCoder *c, uint8_t *intra4x4,
int stride, int keyframe)
{
int x, y, t, l;
const uint8_t *ctx = vp8_pred4x4_prob_inter;
for (y = 0; y < 4; y++) {
for (x = 0; x < 4; x++) {
if (keyframe) {
t = intra4x4[x - stride];
l = intra4x4[x - 1];
ctx = vp8_pred4x4_prob_intra[t][l];
}
intra4x4[x] = vp8_rac_get_tree(c, vp8_pred4x4_tree, ctx);
}
intra4x4 += stride;
}
}
static void decode_mb_mode(VP8Context *s, VP8Macroblock *mb, int mb_x, int mb_y,
uint8_t *intra4x4)
{
VP56RangeCoder *c = &s->c;
int n;
if (s->segmentation.update_map)
mb->segment = vp8_rac_get_tree(c, vp8_segmentid_tree, s->prob->segmentid);
mb->skip = s->mbskip_enabled ? vp56_rac_get_prob(c, s->prob->mbskip) : 0;
if (s->keyframe) {
mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_intra, vp8_pred16x16_prob_intra);
if (mb->mode == MODE_I4x4) {
decode_intra4x4_modes(c, intra4x4, s->b4_stride, 1);
} else
fill_rectangle(intra4x4, 4, 4, s->b4_stride, vp8_pred4x4_mode[mb->mode], 1);
s->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree, vp8_pred8x8c_prob_intra);
mb->ref_frame = VP56_FRAME_CURRENT;
} else if (vp56_rac_get_prob(c, s->prob->intra)) {
VP56mv near[2], best;
int cnt[4] = { 0 };
uint8_t p[4];
// inter MB, 16.2
if (vp56_rac_get_prob(c, s->prob->last))
mb->ref_frame = vp56_rac_get_prob(c, s->prob->golden) ?
VP56_FRAME_GOLDEN2 /* altref */ : VP56_FRAME_GOLDEN;
else
mb->ref_frame = VP56_FRAME_PREVIOUS;
// motion vectors, 16.3
find_near_mvs(s, mb, mb_x, mb_y, near, &best, cnt);
for (n = 0; n < 4; n++)
p[n] = vp8_mode_contexts[cnt[n]][n];
mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_mvinter, p);
switch (mb->mode) {
case VP8_MVMODE_SPLIT:
mb->mv = mb->bmv[decode_splitmvs(s, c, mb, &best) - 1];
break;
case VP8_MVMODE_ZERO:
mb->mv.x = 0;
mb->mv.y = 0;
break;
case VP8_MVMODE_NEAREST:
clamp_mv(s, &mb->mv, &near[0], mb_x, mb_y);
break;
case VP8_MVMODE_NEAR:
clamp_mv(s, &mb->mv, &near[1], mb_x, mb_y);
break;
case VP8_MVMODE_NEW:
mb->mv.y = best.y + read_mv_component(c, s->prob->mvc[0]);
mb->mv.x = best.x + read_mv_component(c, s->prob->mvc[1]);
break;
}
if (mb->mode != VP8_MVMODE_SPLIT) {
mb->partitioning = VP8_SPLITMVMODE_NONE;
mb->bmv[0] = mb->mv;
}
} else {
// intra MB, 16.1
mb->mode = vp8_rac_get_tree(c, vp8_pred16x16_tree_inter, s->prob->pred16x16);
if (mb->mode == MODE_I4x4) {
decode_intra4x4_modes(c, intra4x4, s->b4_stride, 0);
} else
fill_rectangle(intra4x4, 4, 4, s->b4_stride, vp8_pred4x4_mode[mb->mode], 1);
s->chroma_pred_mode = vp8_rac_get_tree(c, vp8_pred8x8c_tree, s->prob->pred8x8c);
mb->ref_frame = VP56_FRAME_CURRENT;
}
}
/**
* @param c arithmetic bitstream reader context
* @param block destination for block coefficients
* @param probs probabilities to use when reading trees from the bitstream
* @param i initial coeff index, 0 unless a separate DC block is coded
* @param zero_nhood the initial prediction context for number of surrounding
* all-zero blocks (only left/top, so 0-2)
* @param qmul array holding the dc/ac dequant factor at position 0/1
* @return 0 if no coeffs were decoded
* otherwise, the index of the last coeff decoded plus one
*/
static int decode_block_coeffs(VP56RangeCoder *c, DCTELEM block[16],
uint8_t probs[8][3][NUM_DCT_TOKENS-1],
int i, int zero_nhood, int16_t qmul[2])
{
int token, nonzero = 0;
int offset = 0;
for (; i < 16; i++) {
token = vp8_rac_get_tree_with_offset(c, vp8_coeff_tree, probs[vp8_coeff_band[i]][zero_nhood], offset);
if (token == DCT_EOB)
break;
else if (token >= DCT_CAT1) {
int cat = token-DCT_CAT1;
token = vp8_rac_get_coeff(c, vp8_dct_cat_prob[cat]);
token += vp8_dct_cat_offset[cat];
}
// after the first token, the non-zero prediction context becomes
// based on the last decoded coeff
if (!token) {
zero_nhood = 0;
offset = 1;
continue;
} else if (token == 1)
zero_nhood = 1;
else
zero_nhood = 2;
// todo: full [16] qmat? load into register?
block[zigzag_scan[i]] = (vp8_rac_get(c) ? -token : token) * qmul[!!i];
nonzero = i+1;
offset = 0;
}
return nonzero;
}
static void decode_mb_coeffs(VP8Context *s, VP56RangeCoder *c, VP8Macroblock *mb,
uint8_t t_nnz[9], uint8_t l_nnz[9])
{
LOCAL_ALIGNED_16(DCTELEM, dc,[16]);
int i, x, y, luma_start = 0, luma_ctx = 3;
int nnz_pred, nnz, nnz_total = 0;
int segment = s->segmentation.enabled ? mb->segment : 0;
s->dsp.clear_blocks((DCTELEM *)s->block);
if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {
AV_ZERO128(dc);
AV_ZERO128(dc+8);
nnz_pred = t_nnz[8] + l_nnz[8];
// decode DC values and do hadamard
nnz = decode_block_coeffs(c, dc, s->prob->token[1], 0, nnz_pred,
s->qmat[segment].luma_dc_qmul);
l_nnz[8] = t_nnz[8] = !!nnz;
nnz_total += nnz;
s->vp8dsp.vp8_luma_dc_wht(s->block, dc);
luma_start = 1;
luma_ctx = 0;
}
// luma blocks
for (y = 0; y < 4; y++)
for (x = 0; x < 4; x++) {
nnz_pred = l_nnz[y] + t_nnz[x];
nnz = decode_block_coeffs(c, s->block[y][x], s->prob->token[luma_ctx], luma_start,
nnz_pred, s->qmat[segment].luma_qmul);
// nnz+luma_start may be one more than the actual last index, but we don't care
s->non_zero_count_cache[y][x] = nnz + luma_start;
t_nnz[x] = l_nnz[y] = !!nnz;
nnz_total += nnz;
}
// chroma blocks
// TODO: what to do about dimensions? 2nd dim for luma is x,
// but for chroma it's (y<<1)|x
for (i = 4; i < 6; i++)
for (y = 0; y < 2; y++)
for (x = 0; x < 2; x++) {
nnz_pred = l_nnz[i+2*y] + t_nnz[i+2*x];
nnz = decode_block_coeffs(c, s->block[i][(y<<1)+x], s->prob->token[2], 0,
nnz_pred, s->qmat[segment].chroma_qmul);
s->non_zero_count_cache[i][(y<<1)+x] = nnz;
t_nnz[i+2*x] = l_nnz[i+2*y] = !!nnz;
nnz_total += nnz;
}
// if there were no coded coeffs despite the macroblock not being marked skip,
// we MUST not do the inner loop filter and should not do IDCT
// Since skip isn't used for bitstream prediction, just manually set it.
if (!nnz_total)
mb->skip = 1;
}
static av_always_inline
void backup_mb_border(uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr,
int linesize, int uvlinesize, int simple)
{
AV_COPY128(top_border, src_y + 15*linesize);
if (!simple) {
AV_COPY64(top_border+16, src_cb + 7*uvlinesize);
AV_COPY64(top_border+24, src_cr + 7*uvlinesize);
}
}
static av_always_inline
void xchg_mb_border(uint8_t *top_border, uint8_t *src_y, uint8_t *src_cb, uint8_t *src_cr,
int linesize, int uvlinesize, int mb_x, int mb_y, int mb_width,
int simple, int xchg)
{
uint8_t *top_border_m1 = top_border-32; // for TL prediction
src_y -= linesize;
src_cb -= uvlinesize;
src_cr -= uvlinesize;
#define XCHG(a,b,xchg)\
if (xchg) AV_SWAP64(b,a);\
else AV_COPY64(b,a);
XCHG(top_border_m1+8, src_y-8, xchg);
XCHG(top_border, src_y, xchg);
XCHG(top_border+8, src_y+8, 1);
if (mb_x < mb_width-1)
XCHG(top_border+32, src_y+16, 1);
// only copy chroma for normal loop filter
// or to initialize the top row to 127
if (!simple || !mb_y) {
XCHG(top_border_m1+16, src_cb-8, xchg);
XCHG(top_border_m1+24, src_cr-8, xchg);
XCHG(top_border+16, src_cb, 1);
XCHG(top_border+24, src_cr, 1);
}
}
static int check_intra_pred_mode(int mode, int mb_x, int mb_y)
{
if (mode == DC_PRED8x8) {
if (!(mb_x|mb_y))
mode = DC_128_PRED8x8;
else if (!mb_y)
mode = LEFT_DC_PRED8x8;
else if (!mb_x)
mode = TOP_DC_PRED8x8;
}
return mode;
}
static void intra_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
uint8_t *bmode, int mb_x, int mb_y)
{
int x, y, mode, nnz, tr;
// for the first row, we need to run xchg_mb_border to init the top edge to 127
// otherwise, skip it if we aren't going to deblock
if (s->deblock_filter || !mb_y)
xchg_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2],
s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,
s->filter.simple, 1);
if (mb->mode < MODE_I4x4) {
mode = check_intra_pred_mode(mb->mode, mb_x, mb_y);
s->hpc.pred16x16[mode](dst[0], s->linesize);
} else {
uint8_t *ptr = dst[0];
// all blocks on the right edge of the macroblock use bottom edge
// the top macroblock for their topright edge
uint8_t *tr_right = ptr - s->linesize + 16;
// if we're on the right edge of the frame, said edge is extended
// from the top macroblock
if (mb_x == s->mb_width-1) {
tr = tr_right[-1]*0x01010101;
tr_right = (uint8_t *)&tr;
}
for (y = 0; y < 4; y++) {
uint8_t *topright = ptr + 4 - s->linesize;
for (x = 0; x < 4; x++) {
if (x == 3)
topright = tr_right;
s->hpc.pred4x4[bmode[x]](ptr+4*x, topright, s->linesize);
nnz = s->non_zero_count_cache[y][x];
if (nnz) {
if (nnz == 1)
s->vp8dsp.vp8_idct_dc_add(ptr+4*x, s->block[y][x], s->linesize);
else
s->vp8dsp.vp8_idct_add(ptr+4*x, s->block[y][x], s->linesize);
}
topright += 4;
}
ptr += 4*s->linesize;
bmode += s->b4_stride;
}
}
mode = check_intra_pred_mode(s->chroma_pred_mode, mb_x, mb_y);
s->hpc.pred8x8[mode](dst[1], s->uvlinesize);
s->hpc.pred8x8[mode](dst[2], s->uvlinesize);
if (s->deblock_filter || !mb_y)
xchg_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2],
s->linesize, s->uvlinesize, mb_x, mb_y, s->mb_width,
s->filter.simple, 0);
}
/**
* Generic MC function.
*
* @param s VP8 decoding context
* @param luma 1 for luma (Y) planes, 0 for chroma (Cb/Cr) planes
* @param dst target buffer for block data at block position
* @param src reference picture buffer at origin (0, 0)
* @param mv motion vector (relative to block position) to get pixel data from
* @param x_off horizontal position of block from origin (0, 0)
* @param y_off vertical position of block from origin (0, 0)
* @param block_w width of block (16, 8 or 4)
* @param block_h height of block (always same as block_w)
* @param width width of src/dst plane data
* @param height height of src/dst plane data
* @param linesize size of a single line of plane data, including padding
* @param mc_func motion compensation function pointers (bilinear or sixtap MC)
*/
static inline void vp8_mc(VP8Context *s, int luma,
uint8_t *dst, uint8_t *src, const VP56mv *mv,
int x_off, int y_off, int block_w, int block_h,
int width, int height, int linesize,
vp8_mc_func mc_func[3][3])
{
static const uint8_t idx[8] = { 0, 1, 2, 1, 2, 1, 2, 1 };
int mx = (mv->x << luma)&7, mx_idx = idx[mx];
int my = (mv->y << luma)&7, my_idx = idx[my];
x_off += mv->x >> (3 - luma);
y_off += mv->y >> (3 - luma);
// edge emulation
src += y_off * linesize + x_off;
if (x_off < 2 || x_off >= width - block_w - 3 ||
y_off < 2 || y_off >= height - block_h - 3) {
ff_emulated_edge_mc(s->edge_emu_buffer, src - 2 * linesize - 2, linesize,
block_w + 5, block_h + 5,
x_off - 2, y_off - 2, width, height);
src = s->edge_emu_buffer + 2 + linesize * 2;
}
mc_func[my_idx][mx_idx](dst, linesize, src, linesize, block_h, mx, my);
}
static inline void vp8_mc_part(VP8Context *s, uint8_t *dst[3],
AVFrame *ref_frame, int x_off, int y_off,
int bx_off, int by_off,
int block_w, int block_h,
int width, int height, VP56mv *mv)
{
VP56mv uvmv = *mv;
/* Y */
vp8_mc(s, 1, dst[0] + by_off * s->linesize + bx_off,
ref_frame->data[0], mv, x_off + bx_off, y_off + by_off,
block_w, block_h, width, height, s->linesize,
s->put_pixels_tab[block_w == 8]);
/* U/V */
if (s->profile == 3) {
uvmv.x &= ~7;
uvmv.y &= ~7;
}
x_off >>= 1; y_off >>= 1;
bx_off >>= 1; by_off >>= 1;
width >>= 1; height >>= 1;
block_w >>= 1; block_h >>= 1;
vp8_mc(s, 0, dst[1] + by_off * s->uvlinesize + bx_off,
ref_frame->data[1], &uvmv, x_off + bx_off, y_off + by_off,
block_w, block_h, width, height, s->uvlinesize,
s->put_pixels_tab[1 + (block_w == 4)]);
vp8_mc(s, 0, dst[2] + by_off * s->uvlinesize + bx_off,
ref_frame->data[2], &uvmv, x_off + bx_off, y_off + by_off,
block_w, block_h, width, height, s->uvlinesize,
s->put_pixels_tab[1 + (block_w == 4)]);
}
/**
* Apply motion vectors to prediction buffer, chapter 18.
*/
static void inter_predict(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb,
int mb_x, int mb_y)
{
int x_off = mb_x << 4, y_off = mb_y << 4;
int width = 16*s->mb_width, height = 16*s->mb_height;
if (mb->mode < VP8_MVMODE_SPLIT) {
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 0, 16, 16, width, height, &mb->mv);
} else switch (mb->partitioning) {
case VP8_SPLITMVMODE_4x4: {
int x, y;
VP56mv uvmv;
/* Y */
for (y = 0; y < 4; y++) {
for (x = 0; x < 4; x++) {
vp8_mc(s, 1, dst[0] + 4*y*s->linesize + x*4,
s->framep[mb->ref_frame]->data[0], &mb->bmv[4*y + x],
4*x + x_off, 4*y + y_off, 4, 4,
width, height, s->linesize,
s->put_pixels_tab[2]);
}
}
/* U/V */
x_off >>= 1; y_off >>= 1; width >>= 1; height >>= 1;
for (y = 0; y < 2; y++) {
for (x = 0; x < 2; x++) {
uvmv.x = mb->bmv[ 2*y * 4 + 2*x ].x +
mb->bmv[ 2*y * 4 + 2*x+1].x +
mb->bmv[(2*y+1) * 4 + 2*x ].x +
mb->bmv[(2*y+1) * 4 + 2*x+1].x;
uvmv.y = mb->bmv[ 2*y * 4 + 2*x ].y +
mb->bmv[ 2*y * 4 + 2*x+1].y +
mb->bmv[(2*y+1) * 4 + 2*x ].y +
mb->bmv[(2*y+1) * 4 + 2*x+1].y;
uvmv.x = (uvmv.x + 2 + (uvmv.x >> (INT_BIT-1))) >> 2;
uvmv.y = (uvmv.y + 2 + (uvmv.y >> (INT_BIT-1))) >> 2;
if (s->profile == 3) {
uvmv.x &= ~7;
uvmv.y &= ~7;
}
vp8_mc(s, 0, dst[1] + 4*y*s->uvlinesize + x*4,
s->framep[mb->ref_frame]->data[1], &uvmv,
4*x + x_off, 4*y + y_off, 4, 4,
width, height, s->uvlinesize,
s->put_pixels_tab[2]);
vp8_mc(s, 0, dst[2] + 4*y*s->uvlinesize + x*4,
s->framep[mb->ref_frame]->data[2], &uvmv,
4*x + x_off, 4*y + y_off, 4, 4,
width, height, s->uvlinesize,
s->put_pixels_tab[2]);
}
}
break;
}
case VP8_SPLITMVMODE_16x8:
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 0, 16, 8, width, height, &mb->bmv[0]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 8, 16, 8, width, height, &mb->bmv[1]);
break;
case VP8_SPLITMVMODE_8x16:
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 0, 8, 16, width, height, &mb->bmv[0]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
8, 0, 8, 16, width, height, &mb->bmv[1]);
break;
case VP8_SPLITMVMODE_8x8:
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 0, 8, 8, width, height, &mb->bmv[0]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
8, 0, 8, 8, width, height, &mb->bmv[1]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
0, 8, 8, 8, width, height, &mb->bmv[2]);
vp8_mc_part(s, dst, s->framep[mb->ref_frame], x_off, y_off,
8, 8, 8, 8, width, height, &mb->bmv[3]);
break;
}
}
static void idct_mb(VP8Context *s, uint8_t *y_dst, uint8_t *u_dst, uint8_t *v_dst,
VP8Macroblock *mb)
{
int x, y, nnz;
if (mb->mode != MODE_I4x4)
for (y = 0; y < 4; y++) {
for (x = 0; x < 4; x++) {
nnz = s->non_zero_count_cache[y][x];
if (nnz) {
if (nnz == 1)
s->vp8dsp.vp8_idct_dc_add(y_dst+4*x, s->block[y][x], s->linesize);
else
s->vp8dsp.vp8_idct_add(y_dst+4*x, s->block[y][x], s->linesize);
}
}
y_dst += 4*s->linesize;
}
for (y = 0; y < 2; y++) {
for (x = 0; x < 2; x++) {
nnz = s->non_zero_count_cache[4][(y<<1)+x];
if (nnz) {
if (nnz == 1)
s->vp8dsp.vp8_idct_dc_add(u_dst+4*x, s->block[4][(y<<1)+x], s->uvlinesize);
else
s->vp8dsp.vp8_idct_add(u_dst+4*x, s->block[4][(y<<1)+x], s->uvlinesize);
}
nnz = s->non_zero_count_cache[5][(y<<1)+x];
if (nnz) {
if (nnz == 1)
s->vp8dsp.vp8_idct_dc_add(v_dst+4*x, s->block[5][(y<<1)+x], s->uvlinesize);
else
s->vp8dsp.vp8_idct_add(v_dst+4*x, s->block[5][(y<<1)+x], s->uvlinesize);
}
}
u_dst += 4*s->uvlinesize;
v_dst += 4*s->uvlinesize;
}
}
static void filter_level_for_mb(VP8Context *s, VP8Macroblock *mb, int *level, int *inner, int *hev_thresh)
{
int interior_limit, filter_level;
if (s->segmentation.enabled) {
filter_level = s->segmentation.filter_level[mb->segment];
if (!s->segmentation.absolute_vals)
filter_level += s->filter.level;
} else
filter_level = s->filter.level;
if (s->lf_delta.enabled) {
filter_level += s->lf_delta.ref[mb->ref_frame];
if (mb->ref_frame == VP56_FRAME_CURRENT) {
if (mb->mode == MODE_I4x4)
filter_level += s->lf_delta.mode[0];
} else {
if (mb->mode == VP8_MVMODE_ZERO)
filter_level += s->lf_delta.mode[1];
else if (mb->mode == VP8_MVMODE_SPLIT)
filter_level += s->lf_delta.mode[3];
else
filter_level += s->lf_delta.mode[2];
}
}
filter_level = av_clip(filter_level, 0, 63);
interior_limit = filter_level;
if (s->filter.sharpness) {
interior_limit >>= s->filter.sharpness > 4 ? 2 : 1;
interior_limit = FFMIN(interior_limit, 9 - s->filter.sharpness);
}
interior_limit = FFMAX(interior_limit, 1);
*level = filter_level;
*inner = interior_limit;
if (hev_thresh) {
*hev_thresh = filter_level >= 15;
if (s->keyframe) {
if (filter_level >= 40)
*hev_thresh = 2;
} else {
if (filter_level >= 40)
*hev_thresh = 3;
else if (filter_level >= 20)
*hev_thresh = 2;
}
}
}
static void filter_mb(VP8Context *s, uint8_t *dst[3], VP8Macroblock *mb, int mb_x, int mb_y)
{
int filter_level, inner_limit, hev_thresh, mbedge_lim, bedge_lim;
filter_level_for_mb(s, mb, &filter_level, &inner_limit, &hev_thresh);
if (!filter_level)
return;
mbedge_lim = 2*(filter_level+2) + inner_limit;
bedge_lim = 2* filter_level + inner_limit;
if (mb_x) {
s->vp8dsp.vp8_h_loop_filter16y(dst[0], s->linesize,
mbedge_lim, inner_limit, hev_thresh);
s->vp8dsp.vp8_h_loop_filter8uv(dst[1], dst[2], s->uvlinesize,
mbedge_lim, inner_limit, hev_thresh);
}
if (!mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT) {
s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 4, s->linesize, bedge_lim,
inner_limit, hev_thresh);
s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+ 8, s->linesize, bedge_lim,
inner_limit, hev_thresh);
s->vp8dsp.vp8_h_loop_filter16y_inner(dst[0]+12, s->linesize, bedge_lim,
inner_limit, hev_thresh);
s->vp8dsp.vp8_h_loop_filter8uv_inner(dst[1] + 4, dst[2] + 4,
s->uvlinesize, bedge_lim,
inner_limit, hev_thresh);
}
if (mb_y) {
s->vp8dsp.vp8_v_loop_filter16y(dst[0], s->linesize,
mbedge_lim, inner_limit, hev_thresh);
s->vp8dsp.vp8_v_loop_filter8uv(dst[1], dst[2], s->uvlinesize,
mbedge_lim, inner_limit, hev_thresh);
}
if (!mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT) {
s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 4*s->linesize,
s->linesize, bedge_lim,
inner_limit, hev_thresh);
s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+ 8*s->linesize,
s->linesize, bedge_lim,
inner_limit, hev_thresh);
s->vp8dsp.vp8_v_loop_filter16y_inner(dst[0]+12*s->linesize,
s->linesize, bedge_lim,
inner_limit, hev_thresh);
s->vp8dsp.vp8_v_loop_filter8uv_inner(dst[1] + 4 * s->uvlinesize,
dst[2] + 4 * s->uvlinesize,
s->uvlinesize, bedge_lim,
inner_limit, hev_thresh);
}
}
static void filter_mb_simple(VP8Context *s, uint8_t *dst, VP8Macroblock *mb, int mb_x, int mb_y)
{
int filter_level, inner_limit, mbedge_lim, bedge_lim;
filter_level_for_mb(s, mb, &filter_level, &inner_limit, NULL);
if (!filter_level)
return;
mbedge_lim = 2*(filter_level+2) + inner_limit;
bedge_lim = 2* filter_level + inner_limit;
if (mb_x)
s->vp8dsp.vp8_h_loop_filter_simple(dst, s->linesize, mbedge_lim);
if (!mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT) {
s->vp8dsp.vp8_h_loop_filter_simple(dst+ 4, s->linesize, bedge_lim);
s->vp8dsp.vp8_h_loop_filter_simple(dst+ 8, s->linesize, bedge_lim);
s->vp8dsp.vp8_h_loop_filter_simple(dst+12, s->linesize, bedge_lim);
}
if (mb_y)
s->vp8dsp.vp8_v_loop_filter_simple(dst, s->linesize, mbedge_lim);
if (!mb->skip || mb->mode == MODE_I4x4 || mb->mode == VP8_MVMODE_SPLIT) {
s->vp8dsp.vp8_v_loop_filter_simple(dst+ 4*s->linesize, s->linesize, bedge_lim);
s->vp8dsp.vp8_v_loop_filter_simple(dst+ 8*s->linesize, s->linesize, bedge_lim);
s->vp8dsp.vp8_v_loop_filter_simple(dst+12*s->linesize, s->linesize, bedge_lim);
}
}
static void filter_mb_row(VP8Context *s, int mb_y)
{
VP8Macroblock *mb = s->macroblocks + mb_y*s->mb_stride;
uint8_t *dst[3] = {
s->framep[VP56_FRAME_CURRENT]->data[0] + 16*mb_y*s->linesize,
s->framep[VP56_FRAME_CURRENT]->data[1] + 8*mb_y*s->uvlinesize,
s->framep[VP56_FRAME_CURRENT]->data[2] + 8*mb_y*s->uvlinesize
};
int mb_x;
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
backup_mb_border(s->top_border[mb_x+1], dst[0], dst[1], dst[2], s->linesize, s->uvlinesize, 0);
filter_mb(s, dst, mb++, mb_x, mb_y);
dst[0] += 16;
dst[1] += 8;
dst[2] += 8;
}
}
static void filter_mb_row_simple(VP8Context *s, int mb_y)
{
uint8_t *dst = s->framep[VP56_FRAME_CURRENT]->data[0] + 16*mb_y*s->linesize;
VP8Macroblock *mb = s->macroblocks + mb_y*s->mb_stride;
int mb_x;
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
backup_mb_border(s->top_border[mb_x+1], dst, NULL, NULL, s->linesize, 0, 1);
filter_mb_simple(s, dst, mb++, mb_x, mb_y);
dst += 16;
}
}
static int vp8_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
AVPacket *avpkt)
{
VP8Context *s = avctx->priv_data;
int ret, mb_x, mb_y, i, y, referenced;
enum AVDiscard skip_thresh;
AVFrame *curframe;
if ((ret = decode_frame_header(s, avpkt->data, avpkt->size)) < 0)
return ret;
referenced = s->update_last || s->update_golden == VP56_FRAME_CURRENT
|| s->update_altref == VP56_FRAME_CURRENT;
skip_thresh = !referenced ? AVDISCARD_NONREF :
!s->keyframe ? AVDISCARD_NONKEY : AVDISCARD_ALL;
if (avctx->skip_frame >= skip_thresh) {
s->invisible = 1;
goto skip_decode;
}
s->deblock_filter = s->filter.level && avctx->skip_loop_filter < skip_thresh;
for (i = 0; i < 4; i++)
if (&s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&
&s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&
&s->frames[i] != s->framep[VP56_FRAME_GOLDEN2]) {
curframe = s->framep[VP56_FRAME_CURRENT] = &s->frames[i];
break;
}
if (curframe->data[0])
avctx->release_buffer(avctx, curframe);
curframe->key_frame = s->keyframe;
curframe->pict_type = s->keyframe ? FF_I_TYPE : FF_P_TYPE;
curframe->reference = referenced ? 3 : 0;
if ((ret = avctx->get_buffer(avctx, curframe))) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed!\n");
return ret;
}
// Given that arithmetic probabilities are updated every frame, it's quite likely
// that the values we have on a random interframe are complete junk if we didn't
// start decode on a keyframe. So just don't display anything rather than junk.
if (!s->keyframe && (!s->framep[VP56_FRAME_PREVIOUS] ||
!s->framep[VP56_FRAME_GOLDEN] ||
!s->framep[VP56_FRAME_GOLDEN2])) {
av_log(avctx, AV_LOG_WARNING, "Discarding interframe without a prior keyframe!\n");
return AVERROR_INVALIDDATA;
}
s->linesize = curframe->linesize[0];
s->uvlinesize = curframe->linesize[1];
if (!s->edge_emu_buffer)
s->edge_emu_buffer = av_malloc(21*s->linesize);
memset(s->top_nnz, 0, s->mb_width*sizeof(*s->top_nnz));
// top edge of 127 for intra prediction
memset(s->top_border, 127, (s->mb_width+1)*sizeof(*s->top_border));
for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
VP56RangeCoder *c = &s->coeff_partition[mb_y & (s->num_coeff_partitions-1)];
VP8Macroblock *mb = s->macroblocks + mb_y*s->mb_stride;
uint8_t *intra4x4 = s->intra4x4_pred_mode + 4*mb_y*s->b4_stride;
uint8_t *dst[3] = {
curframe->data[0] + 16*mb_y*s->linesize,
curframe->data[1] + 8*mb_y*s->uvlinesize,
curframe->data[2] + 8*mb_y*s->uvlinesize
};
memset(s->left_nnz, 0, sizeof(s->left_nnz));
// left edge of 129 for intra prediction
if (!(avctx->flags & CODEC_FLAG_EMU_EDGE))
for (i = 0; i < 3; i++)
for (y = 0; y < 16>>!!i; y++)
dst[i][y*curframe->linesize[i]-1] = 129;
if (mb_y)
memset(s->top_border, 129, sizeof(*s->top_border));
for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
decode_mb_mode(s, mb, mb_x, mb_y, intra4x4 + 4*mb_x);
if (!mb->skip)
decode_mb_coeffs(s, c, mb, s->top_nnz[mb_x], s->left_nnz);
else {
AV_ZERO128(s->non_zero_count_cache); // luma
AV_ZERO64(s->non_zero_count_cache[4]); // chroma
}
if (mb->mode <= MODE_I4x4) {
intra_predict(s, dst, mb, intra4x4 + 4*mb_x, mb_x, mb_y);
memset(mb->bmv, 0, sizeof(mb->bmv));
} else {
inter_predict(s, dst, mb, mb_x, mb_y);
}
if (!mb->skip) {
idct_mb(s, dst[0], dst[1], dst[2], mb);
} else {
AV_ZERO64(s->left_nnz);
AV_WN64(s->top_nnz[mb_x], 0); // array of 9, so unaligned
// Reset DC block predictors if they would exist if the mb had coefficients
if (mb->mode != MODE_I4x4 && mb->mode != VP8_MVMODE_SPLIT) {
s->left_nnz[8] = 0;
s->top_nnz[mb_x][8] = 0;
}
}
dst[0] += 16;
dst[1] += 8;
dst[2] += 8;
mb++;
}
if (s->deblock_filter) {
if (s->filter.simple)
filter_mb_row_simple(s, mb_y);
else
filter_mb_row(s, mb_y);
}
}
skip_decode:
// if future frames don't use the updated probabilities,
// reset them to the values we saved
if (!s->update_probabilities)
s->prob[0] = s->prob[1];
// check if golden and altref are swapped
if (s->update_altref == VP56_FRAME_GOLDEN &&
s->update_golden == VP56_FRAME_GOLDEN2)
FFSWAP(AVFrame *, s->framep[VP56_FRAME_GOLDEN], s->framep[VP56_FRAME_GOLDEN2]);
else {
if (s->update_altref != VP56_FRAME_NONE)
s->framep[VP56_FRAME_GOLDEN2] = s->framep[s->update_altref];
if (s->update_golden != VP56_FRAME_NONE)
s->framep[VP56_FRAME_GOLDEN] = s->framep[s->update_golden];
}
if (s->update_last) // move cur->prev
s->framep[VP56_FRAME_PREVIOUS] = s->framep[VP56_FRAME_CURRENT];
// release no longer referenced frames
for (i = 0; i < 4; i++)
if (s->frames[i].data[0] &&
&s->frames[i] != s->framep[VP56_FRAME_CURRENT] &&
&s->frames[i] != s->framep[VP56_FRAME_PREVIOUS] &&
&s->frames[i] != s->framep[VP56_FRAME_GOLDEN] &&
&s->frames[i] != s->framep[VP56_FRAME_GOLDEN2])
avctx->release_buffer(avctx, &s->frames[i]);
if (!s->invisible) {
*(AVFrame*)data = *s->framep[VP56_FRAME_CURRENT];
*data_size = sizeof(AVFrame);
}
return avpkt->size;
}
static av_cold int vp8_decode_init(AVCodecContext *avctx)
{
VP8Context *s = avctx->priv_data;
s->avctx = avctx;
avctx->pix_fmt = PIX_FMT_YUV420P;
dsputil_init(&s->dsp, avctx);
ff_h264_pred_init(&s->hpc, CODEC_ID_VP8);
ff_vp8dsp_init(&s->vp8dsp);
// intra pred needs edge emulation among other things
if (avctx->flags&CODEC_FLAG_EMU_EDGE) {
av_log(avctx, AV_LOG_ERROR, "Edge emulation not supported\n");
return AVERROR_PATCHWELCOME;
}
return 0;
}
static av_cold int vp8_decode_free(AVCodecContext *avctx)
{
vp8_decode_flush(avctx);
return 0;
}
AVCodec vp8_decoder = {
"vp8",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_VP8,
sizeof(VP8Context),
vp8_decode_init,
NULL,
vp8_decode_free,
vp8_decode_frame,
CODEC_CAP_DR1,
.flush = vp8_decode_flush,
.long_name = NULL_IF_CONFIG_SMALL("On2 VP8"),
};
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