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FFmpeg/libavcodec/rv30.c
Andreas Rheinhardt 4243da4ff4 avcodec/codec_internal: Use union for FFCodec decode/encode callbacks 
This is possible, because every given FFCodec has to implement
exactly one of these. Doing so decreases sizeof(FFCodec) and
therefore decreases the size of the binary.
Notice that in case of position-independent code the decrease
is in .data.rel.ro, so that this translates to decreased
memory consumption.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2022-04-05 20:02:37 +02:00

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/*
* RV30 decoder
* Copyright (c) 2007 Konstantin Shishkov
*
* 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
* RV30 decoder
*/
#include "avcodec.h"
#include "codec_internal.h"
#include "mpegutils.h"
#include "mpegvideo.h"
#include "mpegvideodec.h"
#include "golomb.h"
#include "rv34.h"
#include "rv30data.h"
static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
{
AVCodecContext *avctx = r->s.avctx;
int mb_bits;
int w = r->s.width, h = r->s.height;
int mb_size;
int rpr;
memset(si, 0, sizeof(SliceInfo));
if(get_bits(gb, 3))
return -1;
si->type = get_bits(gb, 2);
if(si->type == 1) si->type = 0;
if(get_bits1(gb))
return -1;
si->quant = get_bits(gb, 5);
skip_bits1(gb);
si->pts = get_bits(gb, 13);
rpr = get_bits(gb, av_log2(r->max_rpr) + 1);
if(rpr){
if (rpr > r->max_rpr) {
av_log(avctx, AV_LOG_ERROR, "rpr too large\n");
return AVERROR_INVALIDDATA;
}
if (avctx->extradata_size < rpr * 2 + 8) {
av_log(avctx, AV_LOG_ERROR,
"Insufficient extradata - need at least %d bytes, got %d\n",
8 + rpr * 2, avctx->extradata_size);
return AVERROR(EINVAL);
}
w = r->s.avctx->extradata[6 + rpr*2] << 2;
h = r->s.avctx->extradata[7 + rpr*2] << 2;
} else {
w = r->orig_width;
h = r->orig_height;
}
si->width = w;
si->height = h;
mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
mb_bits = ff_rv34_get_start_offset(gb, mb_size);
si->start = get_bits(gb, mb_bits);
skip_bits1(gb);
return 0;
}
/**
* Decode 4x4 intra types array.
*/
static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
{
int i, j, k;
for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
for(j = 0; j < 4; j+= 2){
unsigned code = get_interleaved_ue_golomb(gb) << 1;
if (code > 80U*2U) {
av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
return -1;
}
for(k = 0; k < 2; k++){
int A = dst[-r->intra_types_stride] + 1;
int B = dst[-1] + 1;
*dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
if(dst[-1] == 9){
av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
return -1;
}
}
}
}
return 0;
}
/**
* Decode macroblock information.
*/
static int rv30_decode_mb_info(RV34DecContext *r)
{
static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
MpegEncContext *s = &r->s;
GetBitContext *gb = &s->gb;
unsigned code = get_interleaved_ue_golomb(gb);
if (code > 11) {
av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
return -1;
}
if(code > 5){
av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
code -= 6;
}
if(s->pict_type != AV_PICTURE_TYPE_B)
return rv30_p_types[code];
else
return rv30_b_types[code];
}
static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
const int stride, const int lim)
{
const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
int i, diff;
for(i = 0; i < 4; i++){
diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
diff = av_clip(diff, -lim, lim);
src[-1*step] = cm[src[-1*step] + diff];
src[ 0*step] = cm[src[ 0*step] - diff];
src += stride;
}
}
static void rv30_loop_filter(RV34DecContext *r, int row)
{
MpegEncContext *s = &r->s;
int mb_pos, mb_x;
int i, j, k;
uint8_t *Y, *C;
int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
int mbtype = s->current_picture_ptr->mb_type[mb_pos];
if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
r->deblock_coefs[mb_pos] = 0xFFFF;
if(IS_INTRA(mbtype))
r->cbp_chroma[mb_pos] = 0xFF;
}
/* all vertical edges are filtered first
* and horizontal edges are filtered on the next iteration
*/
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
if(mb_x)
left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
for(j = 0; j < 16; j += 4){
Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
for(i = !mb_x; i < 4; i++, Y += 4){
int ij = i + j;
loc_lim = 0;
if(r->deblock_coefs[mb_pos] & (1 << ij))
loc_lim = cur_lim;
else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
loc_lim = left_lim;
else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
}
}
for(k = 0; k < 2; k++){
int cur_cbp, left_cbp = 0;
cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
if(mb_x)
left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
for(j = 0; j < 8; j += 4){
C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
for(i = !mb_x; i < 2; i++, C += 4){
int ij = i + (j >> 1);
loc_lim = 0;
if (cur_cbp & (1 << ij))
loc_lim = cur_lim;
else if(!i && left_cbp & (1 << (ij + 1)))
loc_lim = left_lim;
else if( i && cur_cbp & (1 << (ij - 1)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
}
}
}
}
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
if(row)
top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
for(j = 4*!row; j < 16; j += 4){
Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
for(i = 0; i < 4; i++, Y += 4){
int ij = i + j;
loc_lim = 0;
if(r->deblock_coefs[mb_pos] & (1 << ij))
loc_lim = cur_lim;
else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
loc_lim = top_lim;
else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
}
}
for(k = 0; k < 2; k++){
int cur_cbp, top_cbp = 0;
cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
if(row)
top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
for(j = 4*!row; j < 8; j += 4){
C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
for(i = 0; i < 2; i++, C += 4){
int ij = i + (j >> 1);
loc_lim = 0;
if (r->cbp_chroma[mb_pos] & (1 << ij))
loc_lim = cur_lim;
else if(!j && top_cbp & (1 << (ij + 2)))
loc_lim = top_lim;
else if( j && cur_cbp & (1 << (ij - 2)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
}
}
}
}
}
/**
* Initialize decoder.
*/
static av_cold int rv30_decode_init(AVCodecContext *avctx)
{
RV34DecContext *r = avctx->priv_data;
int ret;
r->orig_width = avctx->coded_width;
r->orig_height = avctx->coded_height;
if (avctx->extradata_size < 2) {
av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
return AVERROR(EINVAL);
}
r->rv30 = 1;
if ((ret = ff_rv34_decode_init(avctx)) < 0)
return ret;
r->max_rpr = avctx->extradata[1] & 7;
if(avctx->extradata_size < 2*r->max_rpr + 8){
av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n",
2*r->max_rpr + 8, avctx->extradata_size);
}
r->parse_slice_header = rv30_parse_slice_header;
r->decode_intra_types = rv30_decode_intra_types;
r->decode_mb_info = rv30_decode_mb_info;
r->loop_filter = rv30_loop_filter;
r->luma_dc_quant_i = rv30_luma_dc_quant;
r->luma_dc_quant_p = rv30_luma_dc_quant;
ff_rv30dsp_init(&r->rdsp);
return 0;
}
const FFCodec ff_rv30_decoder = {
.p.name = "rv30",
.p.long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
.p.type = AVMEDIA_TYPE_VIDEO,
.p.id = AV_CODEC_ID_RV30,
.priv_data_size = sizeof(RV34DecContext),
.init = rv30_decode_init,
.close = ff_rv34_decode_end,
FF_CODEC_DECODE_CB(ff_rv34_decode_frame),
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
AV_CODEC_CAP_FRAME_THREADS,
.flush = ff_mpeg_flush,
.p.pix_fmts = (const enum AVPixelFormat[]) {
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE
},
.update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
FF_CODEC_CAP_ALLOCATE_PROGRESS,
};
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