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ffmpeg/libavcodec/vp56.c
Reimar Döffinger 547c2f002a Make decoding alpha optional for some codecs. 
For codecs where decoding of a whole plane can simply
be skipped, we should offer applications to not decode
alpha for better performance (ca. 30% less CPU usage
and 40% reduced memory bandwidth).
It also means applications do not need to implement support
(even if it is rather simple) for YUVA formats in order to be
able to play these files.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>
2013-09-22 16:20:54 +02:00

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/*
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
* 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
* VP5 and VP6 compatible video decoder (common features)
*/
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "h264chroma.h"
#include "vp56.h"
#include "vp56data.h"
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
{
s->quantizer = quantizer;
s->dequant_dc = ff_vp56_dc_dequant[quantizer] << 2;
s->dequant_ac = ff_vp56_ac_dequant[quantizer] << 2;
}
static int vp56_get_vectors_predictors(VP56Context *s, int row, int col,
VP56Frame ref_frame)
{
int nb_pred = 0;
VP56mv vect[2] = {{0,0}, {0,0}};
int pos, offset;
VP56mv mvp;
for (pos=0; pos<12; pos++) {
mvp.x = col + ff_vp56_candidate_predictor_pos[pos][0];
mvp.y = row + ff_vp56_candidate_predictor_pos[pos][1];
if (mvp.x < 0 || mvp.x >= s->mb_width ||
mvp.y < 0 || mvp.y >= s->mb_height)
continue;
offset = mvp.x + s->mb_width*mvp.y;
if (ff_vp56_reference_frame[s->macroblocks[offset].type] != ref_frame)
continue;
if ((s->macroblocks[offset].mv.x == vect[0].x &&
s->macroblocks[offset].mv.y == vect[0].y) ||
(s->macroblocks[offset].mv.x == 0 &&
s->macroblocks[offset].mv.y == 0))
continue;
vect[nb_pred++] = s->macroblocks[offset].mv;
if (nb_pred > 1) {
nb_pred = -1;
break;
}
s->vector_candidate_pos = pos;
}
s->vector_candidate[0] = vect[0];
s->vector_candidate[1] = vect[1];
return nb_pred+1;
}
static void vp56_parse_mb_type_models(VP56Context *s)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
int i, ctx, type;
for (ctx=0; ctx<3; ctx++) {
if (vp56_rac_get_prob(c, 174)) {
int idx = vp56_rac_gets(c, 4);
memcpy(model->mb_types_stats[ctx],
ff_vp56_pre_def_mb_type_stats[idx][ctx],
sizeof(model->mb_types_stats[ctx]));
}
if (vp56_rac_get_prob(c, 254)) {
for (type=0; type<10; type++) {
for(i=0; i<2; i++) {
if (vp56_rac_get_prob(c, 205)) {
int delta, sign = vp56_rac_get(c);
delta = vp56_rac_get_tree(c, ff_vp56_pmbtm_tree,
ff_vp56_mb_type_model_model);
if (!delta)
delta = 4 * vp56_rac_gets(c, 7);
model->mb_types_stats[ctx][type][i] += (delta ^ -sign) + sign;
}
}
}
}
}
/* compute MB type probability tables based on previous MB type */
for (ctx=0; ctx<3; ctx++) {
int p[10];
for (type=0; type<10; type++)
p[type] = 100 * model->mb_types_stats[ctx][type][1];
for (type=0; type<10; type++) {
int p02, p34, p0234, p17, p56, p89, p5689, p156789;
/* conservative MB type probability */
model->mb_type[ctx][type][0] = 255 - (255 * model->mb_types_stats[ctx][type][0]) / (1 + model->mb_types_stats[ctx][type][0] + model->mb_types_stats[ctx][type][1]);
p[type] = 0; /* same MB type => weight is null */
/* binary tree parsing probabilities */
p02 = p[0] + p[2];
p34 = p[3] + p[4];
p0234 = p02 + p34;
p17 = p[1] + p[7];
p56 = p[5] + p[6];
p89 = p[8] + p[9];
p5689 = p56 + p89;
p156789 = p17 + p5689;
model->mb_type[ctx][type][1] = 1 + 255 * p0234/(1+p0234+p156789);
model->mb_type[ctx][type][2] = 1 + 255 * p02 / (1+p0234);
model->mb_type[ctx][type][3] = 1 + 255 * p17 / (1+p156789);
model->mb_type[ctx][type][4] = 1 + 255 * p[0] / (1+p02);
model->mb_type[ctx][type][5] = 1 + 255 * p[3] / (1+p34);
model->mb_type[ctx][type][6] = 1 + 255 * p[1] / (1+p17);
model->mb_type[ctx][type][7] = 1 + 255 * p56 / (1+p5689);
model->mb_type[ctx][type][8] = 1 + 255 * p[5] / (1+p56);
model->mb_type[ctx][type][9] = 1 + 255 * p[8] / (1+p89);
/* restore initial value */
p[type] = 100 * model->mb_types_stats[ctx][type][1];
}
}
}
static VP56mb vp56_parse_mb_type(VP56Context *s,
VP56mb prev_type, int ctx)
{
uint8_t *mb_type_model = s->modelp->mb_type[ctx][prev_type];
VP56RangeCoder *c = &s->c;
if (vp56_rac_get_prob(c, mb_type_model[0]))
return prev_type;
else
return vp56_rac_get_tree(c, ff_vp56_pmbt_tree, mb_type_model);
}
static void vp56_decode_4mv(VP56Context *s, int row, int col)
{
VP56mv mv = {0,0};
int type[4];
int b;
/* parse each block type */
for (b=0; b<4; b++) {
type[b] = vp56_rac_gets(&s->c, 2);
if (type[b])
type[b]++; /* only returns 0, 2, 3 or 4 (all INTER_PF) */
}
/* get vectors */
for (b=0; b<4; b++) {
switch (type[b]) {
case VP56_MB_INTER_NOVEC_PF:
s->mv[b] = (VP56mv) {0,0};
break;
case VP56_MB_INTER_DELTA_PF:
s->parse_vector_adjustment(s, &s->mv[b]);
break;
case VP56_MB_INTER_V1_PF:
s->mv[b] = s->vector_candidate[0];
break;
case VP56_MB_INTER_V2_PF:
s->mv[b] = s->vector_candidate[1];
break;
}
mv.x += s->mv[b].x;
mv.y += s->mv[b].y;
}
/* this is the one selected for the whole MB for prediction */
s->macroblocks[row * s->mb_width + col].mv = s->mv[3];
/* chroma vectors are average luma vectors */
if (s->avctx->codec->id == AV_CODEC_ID_VP5) {
s->mv[4].x = s->mv[5].x = RSHIFT(mv.x,2);
s->mv[4].y = s->mv[5].y = RSHIFT(mv.y,2);
} else {
s->mv[4] = s->mv[5] = (VP56mv) {mv.x/4, mv.y/4};
}
}
static VP56mb vp56_decode_mv(VP56Context *s, int row, int col)
{
VP56mv *mv, vect = {0,0};
int ctx, b;
ctx = vp56_get_vectors_predictors(s, row, col, VP56_FRAME_PREVIOUS);
s->mb_type = vp56_parse_mb_type(s, s->mb_type, ctx);
s->macroblocks[row * s->mb_width + col].type = s->mb_type;
switch (s->mb_type) {
case VP56_MB_INTER_V1_PF:
mv = &s->vector_candidate[0];
break;
case VP56_MB_INTER_V2_PF:
mv = &s->vector_candidate[1];
break;
case VP56_MB_INTER_V1_GF:
vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
mv = &s->vector_candidate[0];
break;
case VP56_MB_INTER_V2_GF:
vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
mv = &s->vector_candidate[1];
break;
case VP56_MB_INTER_DELTA_PF:
s->parse_vector_adjustment(s, &vect);
mv = &vect;
break;
case VP56_MB_INTER_DELTA_GF:
vp56_get_vectors_predictors(s, row, col, VP56_FRAME_GOLDEN);
s->parse_vector_adjustment(s, &vect);
mv = &vect;
break;
case VP56_MB_INTER_4V:
vp56_decode_4mv(s, row, col);
return s->mb_type;
default:
mv = &vect;
break;
}
s->macroblocks[row*s->mb_width + col].mv = *mv;
/* same vector for all blocks */
for (b=0; b<6; b++)
s->mv[b] = *mv;
return s->mb_type;
}
static void vp56_add_predictors_dc(VP56Context *s, VP56Frame ref_frame)
{
int idx = s->idct_scantable[0];
int b;
for (b=0; b<6; b++) {
VP56RefDc *ab = &s->above_blocks[s->above_block_idx[b]];
VP56RefDc *lb = &s->left_block[ff_vp56_b6to4[b]];
int count = 0;
int dc = 0;
int i;
if (ref_frame == lb->ref_frame) {
dc += lb->dc_coeff;
count++;
}
if (ref_frame == ab->ref_frame) {
dc += ab->dc_coeff;
count++;
}
if (s->avctx->codec->id == AV_CODEC_ID_VP5)
for (i=0; i<2; i++)
if (count < 2 && ref_frame == ab[-1+2*i].ref_frame) {
dc += ab[-1+2*i].dc_coeff;
count++;
}
if (count == 0)
dc = s->prev_dc[ff_vp56_b2p[b]][ref_frame];
else if (count == 2)
dc /= 2;
s->block_coeff[b][idx] += dc;
s->prev_dc[ff_vp56_b2p[b]][ref_frame] = s->block_coeff[b][idx];
ab->dc_coeff = s->block_coeff[b][idx];
ab->ref_frame = ref_frame;
lb->dc_coeff = s->block_coeff[b][idx];
lb->ref_frame = ref_frame;
s->block_coeff[b][idx] *= s->dequant_dc;
}
}
static void vp56_deblock_filter(VP56Context *s, uint8_t *yuv,
int stride, int dx, int dy)
{
int t = ff_vp56_filter_threshold[s->quantizer];
if (dx) s->vp56dsp.edge_filter_hor(yuv + 10-dx , stride, t);
if (dy) s->vp56dsp.edge_filter_ver(yuv + stride*(10-dy), stride, t);
}
static void vp56_mc(VP56Context *s, int b, int plane, uint8_t *src,
int stride, int x, int y)
{
uint8_t *dst = s->frames[VP56_FRAME_CURRENT]->data[plane] + s->block_offset[b];
uint8_t *src_block;
int src_offset;
int overlap_offset = 0;
int mask = s->vp56_coord_div[b] - 1;
int deblock_filtering = s->deblock_filtering;
int dx;
int dy;
if (s->avctx->skip_loop_filter >= AVDISCARD_ALL ||
(s->avctx->skip_loop_filter >= AVDISCARD_NONKEY
&& !s->frames[VP56_FRAME_CURRENT]->key_frame))
deblock_filtering = 0;
dx = s->mv[b].x / s->vp56_coord_div[b];
dy = s->mv[b].y / s->vp56_coord_div[b];
if (b >= 4) {
x /= 2;
y /= 2;
}
x += dx - 2;
y += dy - 2;
if (x<0 || x+12>=s->plane_width[plane] ||
y<0 || y+12>=s->plane_height[plane]) {
s->vdsp.emulated_edge_mc(s->edge_emu_buffer,
src + s->block_offset[b] + (dy-2)*stride + (dx-2),
stride, 12, 12, x, y,
s->plane_width[plane],
s->plane_height[plane]);
src_block = s->edge_emu_buffer;
src_offset = 2 + 2*stride;
} else if (deblock_filtering) {
/* only need a 12x12 block, but there is no such dsp function, */
/* so copy a 16x12 block */
s->hdsp.put_pixels_tab[0][0](s->edge_emu_buffer,
src + s->block_offset[b] + (dy-2)*stride + (dx-2),
stride, 12);
src_block = s->edge_emu_buffer;
src_offset = 2 + 2*stride;
} else {
src_block = src;
src_offset = s->block_offset[b] + dy*stride + dx;
}
if (deblock_filtering)
vp56_deblock_filter(s, src_block, stride, dx&7, dy&7);
if (s->mv[b].x & mask)
overlap_offset += (s->mv[b].x > 0) ? 1 : -1;
if (s->mv[b].y & mask)
overlap_offset += (s->mv[b].y > 0) ? stride : -stride;
if (overlap_offset) {
if (s->filter)
s->filter(s, dst, src_block, src_offset, src_offset+overlap_offset,
stride, s->mv[b], mask, s->filter_selection, b<4);
else
s->vp3dsp.put_no_rnd_pixels_l2(dst, src_block+src_offset,
src_block+src_offset+overlap_offset,
stride, 8);
} else {
s->hdsp.put_pixels_tab[1][0](dst, src_block+src_offset, stride, 8);
}
}
static void vp56_decode_mb(VP56Context *s, int row, int col, int is_alpha)
{
AVFrame *frame_current, *frame_ref;
VP56mb mb_type;
VP56Frame ref_frame;
int b, ab, b_max, plane, off;
if (s->frames[VP56_FRAME_CURRENT]->key_frame)
mb_type = VP56_MB_INTRA;
else
mb_type = vp56_decode_mv(s, row, col);
ref_frame = ff_vp56_reference_frame[mb_type];
s->parse_coeff(s);
vp56_add_predictors_dc(s, ref_frame);
frame_current = s->frames[VP56_FRAME_CURRENT];
frame_ref = s->frames[ref_frame];
if (mb_type != VP56_MB_INTRA && !frame_ref->data[0])
return;
ab = 6*is_alpha;
b_max = 6 - 2*is_alpha;
switch (mb_type) {
case VP56_MB_INTRA:
for (b=0; b<b_max; b++) {
plane = ff_vp56_b2p[b+ab];
s->vp3dsp.idct_put(frame_current->data[plane] + s->block_offset[b],
s->stride[plane], s->block_coeff[b]);
}
break;
case VP56_MB_INTER_NOVEC_PF:
case VP56_MB_INTER_NOVEC_GF:
for (b=0; b<b_max; b++) {
plane = ff_vp56_b2p[b+ab];
off = s->block_offset[b];
s->hdsp.put_pixels_tab[1][0](frame_current->data[plane] + off,
frame_ref->data[plane] + off,
s->stride[plane], 8);
s->vp3dsp.idct_add(frame_current->data[plane] + off,
s->stride[plane], s->block_coeff[b]);
}
break;
case VP56_MB_INTER_DELTA_PF:
case VP56_MB_INTER_V1_PF:
case VP56_MB_INTER_V2_PF:
case VP56_MB_INTER_DELTA_GF:
case VP56_MB_INTER_4V:
case VP56_MB_INTER_V1_GF:
case VP56_MB_INTER_V2_GF:
for (b=0; b<b_max; b++) {
int x_off = b==1 || b==3 ? 8 : 0;
int y_off = b==2 || b==3 ? 8 : 0;
plane = ff_vp56_b2p[b+ab];
vp56_mc(s, b, plane, frame_ref->data[plane], s->stride[plane],
16*col+x_off, 16*row+y_off);
s->vp3dsp.idct_add(frame_current->data[plane] + s->block_offset[b],
s->stride[plane], s->block_coeff[b]);
}
break;
}
if (is_alpha) {
s->block_coeff[4][0] = 0;
s->block_coeff[5][0] = 0;
}
}
static int vp56_size_changed(VP56Context *s)
{
AVCodecContext *avctx = s->avctx;
int stride = s->frames[VP56_FRAME_CURRENT]->linesize[0];
int i;
s->plane_width[0] = s->plane_width[3] = avctx->coded_width;
s->plane_width[1] = s->plane_width[2] = avctx->coded_width/2;
s->plane_height[0] = s->plane_height[3] = avctx->coded_height;
s->plane_height[1] = s->plane_height[2] = avctx->coded_height/2;
for (i=0; i<4; i++)
s->stride[i] = s->flip * s->frames[VP56_FRAME_CURRENT]->linesize[i];
s->mb_width = (avctx->coded_width +15) / 16;
s->mb_height = (avctx->coded_height+15) / 16;
if (s->mb_width > 1000 || s->mb_height > 1000) {
avcodec_set_dimensions(avctx, 0, 0);
av_log(avctx, AV_LOG_ERROR, "picture too big\n");
return -1;
}
av_reallocp_array(&s->above_blocks, 4*s->mb_width+6,
sizeof(*s->above_blocks));
av_reallocp_array(&s->macroblocks, s->mb_width*s->mb_height,
sizeof(*s->macroblocks));
av_free(s->edge_emu_buffer_alloc);
s->edge_emu_buffer_alloc = av_malloc(16*stride);
s->edge_emu_buffer = s->edge_emu_buffer_alloc;
if (!s->above_blocks || !s->macroblocks || !s->edge_emu_buffer_alloc)
return AVERROR(ENOMEM);
if (s->flip < 0)
s->edge_emu_buffer += 15 * stride;
if (s->alpha_context)
return vp56_size_changed(s->alpha_context);
return 0;
}
static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *, int, int);
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
VP56Context *s = avctx->priv_data;
AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
int remaining_buf_size = avpkt->size;
int av_uninit(alpha_offset);
int i, res;
int ret;
if (s->has_alpha) {
if (remaining_buf_size < 3)
return -1;
alpha_offset = bytestream_get_be24(&buf);
remaining_buf_size -= 3;
if (remaining_buf_size < alpha_offset)
return -1;
}
res = s->parse_header(s, buf, remaining_buf_size);
if (res < 0)
return res;
if (res == VP56_SIZE_CHANGE) {
for (i = 0; i < 4; i++) {
av_frame_unref(s->frames[i]);
if (s->alpha_context)
av_frame_unref(s->alpha_context->frames[i]);
}
}
if (ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF) < 0)
return -1;
if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) {
av_frame_unref(s->alpha_context->frames[VP56_FRAME_CURRENT]);
if ((ret = av_frame_ref(s->alpha_context->frames[VP56_FRAME_CURRENT], p)) < 0) {
av_frame_unref(p);
return ret;
}
}
if (res == VP56_SIZE_CHANGE) {
if (vp56_size_changed(s)) {
av_frame_unref(p);
return -1;
}
}
if (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) {
int bak_w = avctx->width;
int bak_h = avctx->height;
int bak_cw = avctx->coded_width;
int bak_ch = avctx->coded_height;
buf += alpha_offset;
remaining_buf_size -= alpha_offset;
res = s->alpha_context->parse_header(s->alpha_context, buf, remaining_buf_size);
if (res != 0) {
if(res==VP56_SIZE_CHANGE) {
av_log(avctx, AV_LOG_ERROR, "Alpha reconfiguration\n");
avctx->width = bak_w;
avctx->height = bak_h;
avctx->coded_width = bak_cw;
avctx->coded_height = bak_ch;
}
av_frame_unref(p);
return -1;
}
}
avctx->execute2(avctx, ff_vp56_decode_mbs, 0, 0, (avctx->pix_fmt == AV_PIX_FMT_YUVA420P) + 1);
if ((res = av_frame_ref(data, p)) < 0)
return res;
*got_frame = 1;
return avpkt->size;
}
static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,
int jobnr, int threadnr)
{
VP56Context *s0 = avctx->priv_data;
int is_alpha = (jobnr == 1);
VP56Context *s = is_alpha ? s0->alpha_context : s0;
AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
int mb_row, mb_col, mb_row_flip, mb_offset = 0;
int block, y, uv, stride_y, stride_uv;
int res;
if (p->key_frame) {
p->pict_type = AV_PICTURE_TYPE_I;
s->default_models_init(s);
for (block=0; block<s->mb_height*s->mb_width; block++)
s->macroblocks[block].type = VP56_MB_INTRA;
} else {
p->pict_type = AV_PICTURE_TYPE_P;
vp56_parse_mb_type_models(s);
s->parse_vector_models(s);
s->mb_type = VP56_MB_INTER_NOVEC_PF;
}
if (s->parse_coeff_models(s))
goto next;
memset(s->prev_dc, 0, sizeof(s->prev_dc));
s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
s->prev_dc[2][VP56_FRAME_CURRENT] = 128;
for (block=0; block < 4*s->mb_width+6; block++) {
s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
s->above_blocks[block].dc_coeff = 0;
s->above_blocks[block].not_null_dc = 0;
}
s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;
stride_y = p->linesize[0];
stride_uv = p->linesize[1];
if (s->flip < 0)
mb_offset = 7;
/* main macroblocks loop */
for (mb_row=0; mb_row<s->mb_height; mb_row++) {
if (s->flip < 0)
mb_row_flip = s->mb_height - mb_row - 1;
else
mb_row_flip = mb_row;
for (block=0; block<4; block++) {
s->left_block[block].ref_frame = VP56_FRAME_NONE;
s->left_block[block].dc_coeff = 0;
s->left_block[block].not_null_dc = 0;
}
memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));
s->above_block_idx[0] = 1;
s->above_block_idx[1] = 2;
s->above_block_idx[2] = 1;
s->above_block_idx[3] = 2;
s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
s->above_block_idx[5] = 3*s->mb_width + 4 + 1;
s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
s->block_offset[1] = s->block_offset[0] + 8;
s->block_offset[3] = s->block_offset[2] + 8;
s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
s->block_offset[5] = s->block_offset[4];
for (mb_col=0; mb_col<s->mb_width; mb_col++) {
vp56_decode_mb(s, mb_row, mb_col, is_alpha);
for (y=0; y<4; y++) {
s->above_block_idx[y] += 2;
s->block_offset[y] += 16;
}
for (uv=4; uv<6; uv++) {
s->above_block_idx[uv] += 1;
s->block_offset[uv] += 8;
}
}
}
next:
if (p->key_frame || s->golden_frame) {
av_frame_unref(s->frames[VP56_FRAME_GOLDEN]);
if ((res = av_frame_ref(s->frames[VP56_FRAME_GOLDEN], p)) < 0)
return res;
}
av_frame_unref(s->frames[VP56_FRAME_PREVIOUS]);
FFSWAP(AVFrame *, s->frames[VP56_FRAME_CURRENT],
s->frames[VP56_FRAME_PREVIOUS]);
return 0;
}
av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
{
VP56Context *s = avctx->priv_data;
return ff_vp56_init_context(avctx, s, flip, has_alpha);
}
av_cold int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
int flip, int has_alpha)
{
int i;
s->avctx = avctx;
avctx->pix_fmt = has_alpha ? AV_PIX_FMT_YUVA420P : AV_PIX_FMT_YUV420P;
if (avctx->skip_alpha) avctx->pix_fmt = AV_PIX_FMT_YUV420P;
ff_h264chroma_init(&s->h264chroma, 8);
ff_hpeldsp_init(&s->hdsp, avctx->flags);
ff_videodsp_init(&s->vdsp, 8);
ff_vp3dsp_init(&s->vp3dsp, avctx->flags);
ff_vp56dsp_init(&s->vp56dsp, avctx->codec->id);
for (i = 0; i < 64; i++) {
#define T(x) (x >> 3) | ((x & 7) << 3)
s->idct_scantable[i] = T(ff_zigzag_direct[i]);
#undef T
}
for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++) {
s->frames[i] = av_frame_alloc();
if (!s->frames[i]) {
ff_vp56_free(avctx);
return AVERROR(ENOMEM);
}
}
s->edge_emu_buffer_alloc = NULL;
s->above_blocks = NULL;
s->macroblocks = NULL;
s->quantizer = -1;
s->deblock_filtering = 1;
s->golden_frame = 0;
s->filter = NULL;
s->has_alpha = has_alpha;
s->modelp = &s->model;
if (flip) {
s->flip = -1;
s->frbi = 2;
s->srbi = 0;
} else {
s->flip = 1;
s->frbi = 0;
s->srbi = 2;
}
return 0;
}
av_cold int ff_vp56_free(AVCodecContext *avctx)
{
VP56Context *s = avctx->priv_data;
return ff_vp56_free_context(s);
}
av_cold int ff_vp56_free_context(VP56Context *s)
{
int i;
av_freep(&s->above_blocks);
av_freep(&s->macroblocks);
av_freep(&s->edge_emu_buffer_alloc);
for (i = 0; i < FF_ARRAY_ELEMS(s->frames); i++)
av_frame_free(&s->frames[i]);
return 0;
}
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