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![Andreas Rheinhardt](/assets/img/avatar_default.png)
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>
1303 lines
38 KiB
C
1303 lines
38 KiB
C
/*
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* Amuse Graphics Movie decoder
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*
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* Copyright (c) 2018 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define BITSTREAM_READER_LE
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#include "libavutil/mem_internal.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "copy_block.h"
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#include "get_bits.h"
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#include "idctdsp.h"
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#include "internal.h"
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static const uint8_t unscaled_luma[64] = {
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16, 11, 10, 16, 24, 40, 51, 61, 12, 12, 14, 19,
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26, 58, 60, 55, 14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62, 18, 22, 37, 56,
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68,109,103, 77, 24, 35, 55, 64, 81,104,113, 92,
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49, 64, 78, 87,103,121,120,101, 72, 92, 95, 98,
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112,100,103,99
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};
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static const uint8_t unscaled_chroma[64] = {
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17, 18, 24, 47, 99, 99, 99, 99, 18, 21, 26, 66,
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99, 99, 99, 99, 24, 26, 56, 99, 99, 99, 99, 99,
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47, 66, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99
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};
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typedef struct MotionVector {
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int16_t x, y;
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} MotionVector;
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typedef struct AGMContext {
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const AVClass *class;
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AVCodecContext *avctx;
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GetBitContext gb;
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GetByteContext gbyte;
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int key_frame;
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int bitstream_size;
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int compression;
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int blocks_w;
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int blocks_h;
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int size[3];
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int plus;
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int dct;
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int rgb;
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unsigned flags;
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unsigned fflags;
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uint8_t *output;
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unsigned padded_output_size;
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unsigned output_size;
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MotionVector *mvectors;
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unsigned mvectors_size;
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VLC vlc;
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AVFrame *prev_frame;
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int luma_quant_matrix[64];
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int chroma_quant_matrix[64];
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ScanTable scantable;
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DECLARE_ALIGNED(32, int16_t, block)[64];
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int16_t *wblocks;
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unsigned wblocks_size;
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int *map;
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unsigned map_size;
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IDCTDSPContext idsp;
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} AGMContext;
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static int read_code(GetBitContext *gb, int *oskip, int *level, int *map, int mode)
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{
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int len = 0, skip = 0, max;
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if (get_bits_left(gb) < 2)
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return AVERROR_INVALIDDATA;
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if (show_bits(gb, 2)) {
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switch (show_bits(gb, 4)) {
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case 1:
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case 9:
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len = 1;
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skip = 3;
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break;
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case 2:
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len = 3;
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skip = 4;
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break;
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case 3:
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len = 7;
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skip = 4;
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break;
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case 5:
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case 13:
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len = 2;
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skip = 3;
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break;
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case 6:
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len = 4;
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skip = 4;
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break;
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case 7:
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len = 8;
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skip = 4;
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break;
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case 10:
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len = 5;
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skip = 4;
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break;
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case 11:
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len = 9;
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skip = 4;
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break;
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case 14:
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len = 6;
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skip = 4;
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break;
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case 15:
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len = ((show_bits(gb, 5) & 0x10) | 0xA0) >> 4;
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skip = 5;
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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skip_bits(gb, skip);
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*level = get_bits(gb, len);
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*map = 1;
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*oskip = 0;
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max = 1 << (len - 1);
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if (*level < max)
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*level = -(max + *level);
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} else if (show_bits(gb, 3) & 4) {
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skip_bits(gb, 3);
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if (mode == 1) {
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if (show_bits(gb, 4)) {
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if (show_bits(gb, 4) == 1) {
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skip_bits(gb, 4);
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*oskip = get_bits(gb, 16);
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} else {
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*oskip = get_bits(gb, 4);
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}
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} else {
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skip_bits(gb, 4);
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*oskip = get_bits(gb, 10);
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}
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} else if (mode == 0) {
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*oskip = get_bits(gb, 10);
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}
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*level = 0;
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} else {
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skip_bits(gb, 3);
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if (mode == 0)
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*oskip = get_bits(gb, 4);
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else if (mode == 1)
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*oskip = 0;
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*level = 0;
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}
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return 0;
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}
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static int decode_intra_blocks(AGMContext *s, GetBitContext *gb,
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const int *quant_matrix, int *skip, int *dc_level)
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{
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const uint8_t *scantable = s->scantable.permutated;
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int level, ret, map = 0;
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memset(s->wblocks, 0, s->wblocks_size);
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for (int i = 0; i < 64; i++) {
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int16_t *block = s->wblocks + scantable[i];
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for (int j = 0; j < s->blocks_w;) {
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if (*skip > 0) {
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int rskip;
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rskip = FFMIN(*skip, s->blocks_w - j);
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j += rskip;
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if (i == 0) {
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for (int k = 0; k < rskip; k++)
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block[64 * k] = *dc_level * quant_matrix[0];
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}
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block += rskip * 64;
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*skip -= rskip;
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} else {
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ret = read_code(gb, skip, &level, &map, s->flags & 1);
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if (ret < 0)
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return ret;
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if (i == 0)
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*dc_level += level;
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block[0] = (i == 0 ? *dc_level : level) * quant_matrix[i];
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block += 64;
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j++;
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}
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}
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}
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return 0;
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}
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static int decode_inter_blocks(AGMContext *s, GetBitContext *gb,
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const int *quant_matrix, int *skip,
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int *map)
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{
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const uint8_t *scantable = s->scantable.permutated;
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int level, ret;
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memset(s->wblocks, 0, s->wblocks_size);
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memset(s->map, 0, s->map_size);
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for (int i = 0; i < 64; i++) {
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int16_t *block = s->wblocks + scantable[i];
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for (int j = 0; j < s->blocks_w;) {
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if (*skip > 0) {
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int rskip;
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rskip = FFMIN(*skip, s->blocks_w - j);
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j += rskip;
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block += rskip * 64;
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*skip -= rskip;
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} else {
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ret = read_code(gb, skip, &level, &map[j], s->flags & 1);
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if (ret < 0)
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return ret;
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block[0] = level * quant_matrix[i];
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block += 64;
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j++;
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}
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}
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}
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return 0;
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}
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static int decode_intra_block(AGMContext *s, GetBitContext *gb,
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const int *quant_matrix, int *skip, int *dc_level)
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{
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const uint8_t *scantable = s->scantable.permutated;
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const int offset = s->plus ? 0 : 1024;
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int16_t *block = s->block;
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int level, ret, map = 0;
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memset(block, 0, sizeof(s->block));
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if (*skip > 0) {
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(*skip)--;
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} else {
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ret = read_code(gb, skip, &level, &map, s->flags & 1);
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if (ret < 0)
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return ret;
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*dc_level += level;
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}
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block[scantable[0]] = offset + *dc_level * quant_matrix[0];
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for (int i = 1; i < 64;) {
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if (*skip > 0) {
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int rskip;
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rskip = FFMIN(*skip, 64 - i);
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i += rskip;
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*skip -= rskip;
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} else {
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ret = read_code(gb, skip, &level, &map, s->flags & 1);
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if (ret < 0)
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return ret;
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block[scantable[i]] = level * quant_matrix[i];
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i++;
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}
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}
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return 0;
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}
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static int decode_intra_plane(AGMContext *s, GetBitContext *gb, int size,
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const int *quant_matrix, AVFrame *frame,
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int plane)
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{
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int ret, skip = 0, dc_level = 0;
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const int offset = s->plus ? 0 : 1024;
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if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0)
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return ret;
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if (s->flags & 1) {
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av_fast_padded_malloc(&s->wblocks, &s->wblocks_size,
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64 * s->blocks_w * sizeof(*s->wblocks));
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if (!s->wblocks)
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return AVERROR(ENOMEM);
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for (int y = 0; y < s->blocks_h; y++) {
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ret = decode_intra_blocks(s, gb, quant_matrix, &skip, &dc_level);
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if (ret < 0)
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return ret;
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for (int x = 0; x < s->blocks_w; x++) {
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s->wblocks[64 * x] += offset;
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s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
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frame->linesize[plane], s->wblocks + 64 * x);
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}
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}
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} else {
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for (int y = 0; y < s->blocks_h; y++) {
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for (int x = 0; x < s->blocks_w; x++) {
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ret = decode_intra_block(s, gb, quant_matrix, &skip, &dc_level);
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if (ret < 0)
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return ret;
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s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
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frame->linesize[plane], s->block);
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}
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}
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}
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align_get_bits(gb);
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if (get_bits_left(gb) < 0)
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av_log(s->avctx, AV_LOG_WARNING, "overread\n");
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if (get_bits_left(gb) > 0)
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av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb));
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return 0;
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}
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static int decode_inter_block(AGMContext *s, GetBitContext *gb,
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const int *quant_matrix, int *skip,
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int *map)
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{
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const uint8_t *scantable = s->scantable.permutated;
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int16_t *block = s->block;
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int level, ret;
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memset(block, 0, sizeof(s->block));
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for (int i = 0; i < 64;) {
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if (*skip > 0) {
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int rskip;
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rskip = FFMIN(*skip, 64 - i);
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i += rskip;
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*skip -= rskip;
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} else {
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ret = read_code(gb, skip, &level, map, s->flags & 1);
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if (ret < 0)
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return ret;
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block[scantable[i]] = level * quant_matrix[i];
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i++;
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}
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}
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return 0;
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}
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static int decode_inter_plane(AGMContext *s, GetBitContext *gb, int size,
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const int *quant_matrix, AVFrame *frame,
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AVFrame *prev, int plane)
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{
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int ret, skip = 0;
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if ((ret = init_get_bits8(gb, s->gbyte.buffer, size)) < 0)
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return ret;
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if (s->flags == 3) {
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av_fast_padded_malloc(&s->wblocks, &s->wblocks_size,
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64 * s->blocks_w * sizeof(*s->wblocks));
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if (!s->wblocks)
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return AVERROR(ENOMEM);
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av_fast_padded_malloc(&s->map, &s->map_size,
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s->blocks_w * sizeof(*s->map));
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if (!s->map)
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return AVERROR(ENOMEM);
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for (int y = 0; y < s->blocks_h; y++) {
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ret = decode_inter_blocks(s, gb, quant_matrix, &skip, s->map);
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if (ret < 0)
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return ret;
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for (int x = 0; x < s->blocks_w; x++) {
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int shift = plane == 0;
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int mvpos = (y >> shift) * (s->blocks_w >> shift) + (x >> shift);
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int orig_mv_x = s->mvectors[mvpos].x;
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int mv_x = s->mvectors[mvpos].x / (1 + !shift);
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int mv_y = s->mvectors[mvpos].y / (1 + !shift);
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int h = s->avctx->coded_height >> !shift;
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int w = s->avctx->coded_width >> !shift;
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int map = s->map[x];
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if (orig_mv_x >= -32) {
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if (y * 8 + mv_y < 0 || y * 8 + mv_y + 8 > h ||
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x * 8 + mv_x < 0 || x * 8 + mv_x + 8 > w)
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return AVERROR_INVALIDDATA;
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copy_block8(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
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prev->data[plane] + ((s->blocks_h - 1 - y) * 8 - mv_y) * prev->linesize[plane] + (x * 8 + mv_x),
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frame->linesize[plane], prev->linesize[plane], 8);
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if (map) {
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s->idsp.idct(s->wblocks + x * 64);
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for (int i = 0; i < 64; i++)
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s->wblocks[i + x * 64] = (s->wblocks[i + x * 64] + 1) & 0xFFFC;
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s->idsp.add_pixels_clamped(&s->wblocks[x*64], frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
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frame->linesize[plane]);
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}
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} else if (map) {
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s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
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frame->linesize[plane], s->wblocks + x * 64);
|
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}
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}
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}
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} else if (s->flags & 2) {
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for (int y = 0; y < s->blocks_h; y++) {
|
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for (int x = 0; x < s->blocks_w; x++) {
|
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int shift = plane == 0;
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int mvpos = (y >> shift) * (s->blocks_w >> shift) + (x >> shift);
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int orig_mv_x = s->mvectors[mvpos].x;
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int mv_x = s->mvectors[mvpos].x / (1 + !shift);
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int mv_y = s->mvectors[mvpos].y / (1 + !shift);
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int h = s->avctx->coded_height >> !shift;
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int w = s->avctx->coded_width >> !shift;
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int map = 0;
|
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ret = decode_inter_block(s, gb, quant_matrix, &skip, &map);
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if (ret < 0)
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return ret;
|
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|
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if (orig_mv_x >= -32) {
|
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if (y * 8 + mv_y < 0 || y * 8 + mv_y + 8 > h ||
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x * 8 + mv_x < 0 || x * 8 + mv_x + 8 > w)
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return AVERROR_INVALIDDATA;
|
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copy_block8(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
|
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prev->data[plane] + ((s->blocks_h - 1 - y) * 8 - mv_y) * prev->linesize[plane] + (x * 8 + mv_x),
|
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frame->linesize[plane], prev->linesize[plane], 8);
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if (map) {
|
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s->idsp.idct(s->block);
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for (int i = 0; i < 64; i++)
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s->block[i] = (s->block[i] + 1) & 0xFFFC;
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s->idsp.add_pixels_clamped(s->block, frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
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frame->linesize[plane]);
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}
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} else if (map) {
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s->idsp.idct_put(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
|
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frame->linesize[plane], s->block);
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}
|
|
}
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}
|
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} else if (s->flags & 1) {
|
|
av_fast_padded_malloc(&s->wblocks, &s->wblocks_size,
|
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64 * s->blocks_w * sizeof(*s->wblocks));
|
|
if (!s->wblocks)
|
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return AVERROR(ENOMEM);
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|
|
av_fast_padded_malloc(&s->map, &s->map_size,
|
|
s->blocks_w * sizeof(*s->map));
|
|
if (!s->map)
|
|
return AVERROR(ENOMEM);
|
|
|
|
for (int y = 0; y < s->blocks_h; y++) {
|
|
ret = decode_inter_blocks(s, gb, quant_matrix, &skip, s->map);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (int x = 0; x < s->blocks_w; x++) {
|
|
if (!s->map[x])
|
|
continue;
|
|
s->idsp.idct_add(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
|
|
frame->linesize[plane], s->wblocks + 64 * x);
|
|
}
|
|
}
|
|
} else {
|
|
for (int y = 0; y < s->blocks_h; y++) {
|
|
for (int x = 0; x < s->blocks_w; x++) {
|
|
int map = 0;
|
|
|
|
ret = decode_inter_block(s, gb, quant_matrix, &skip, &map);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!map)
|
|
continue;
|
|
s->idsp.idct_add(frame->data[plane] + (s->blocks_h - 1 - y) * 8 * frame->linesize[plane] + x * 8,
|
|
frame->linesize[plane], s->block);
|
|
}
|
|
}
|
|
}
|
|
|
|
align_get_bits(gb);
|
|
if (get_bits_left(gb) < 0)
|
|
av_log(s->avctx, AV_LOG_WARNING, "overread\n");
|
|
if (get_bits_left(gb) > 0)
|
|
av_log(s->avctx, AV_LOG_WARNING, "underread: %d\n", get_bits_left(gb));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void compute_quant_matrix(AGMContext *s, double qscale)
|
|
{
|
|
int luma[64], chroma[64];
|
|
double f = 1.0 - fabs(qscale);
|
|
|
|
if (!s->key_frame && (s->flags & 2)) {
|
|
if (qscale >= 0.0) {
|
|
for (int i = 0; i < 64; i++) {
|
|
luma[i] = FFMAX(1, 16 * f);
|
|
chroma[i] = FFMAX(1, 16 * f);
|
|
}
|
|
} else {
|
|
for (int i = 0; i < 64; i++) {
|
|
luma[i] = FFMAX(1, 16 - qscale * 32);
|
|
chroma[i] = FFMAX(1, 16 - qscale * 32);
|
|
}
|
|
}
|
|
} else {
|
|
if (qscale >= 0.0) {
|
|
for (int i = 0; i < 64; i++) {
|
|
luma[i] = FFMAX(1, unscaled_luma [(i & 7) * 8 + (i >> 3)] * f);
|
|
chroma[i] = FFMAX(1, unscaled_chroma[(i & 7) * 8 + (i >> 3)] * f);
|
|
}
|
|
} else {
|
|
for (int i = 0; i < 64; i++) {
|
|
luma[i] = FFMAX(1, 255.0 - (255 - unscaled_luma [(i & 7) * 8 + (i >> 3)]) * f);
|
|
chroma[i] = FFMAX(1, 255.0 - (255 - unscaled_chroma[(i & 7) * 8 + (i >> 3)]) * f);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < 64; i++) {
|
|
int pos = ff_zigzag_direct[i];
|
|
|
|
s->luma_quant_matrix[i] = luma[pos] * ((pos / 8) & 1 ? -1 : 1);
|
|
s->chroma_quant_matrix[i] = chroma[pos] * ((pos / 8) & 1 ? -1 : 1);
|
|
}
|
|
}
|
|
|
|
static int decode_raw_intra_rgb(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
|
|
{
|
|
uint8_t *dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
|
|
uint8_t r = 0, g = 0, b = 0;
|
|
|
|
if (bytestream2_get_bytes_left(gbyte) < 3 * avctx->width * avctx->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
for (int y = 0; y < avctx->height; y++) {
|
|
for (int x = 0; x < avctx->width; x++) {
|
|
dst[x*3+0] = bytestream2_get_byteu(gbyte) + r;
|
|
r = dst[x*3+0];
|
|
dst[x*3+1] = bytestream2_get_byteu(gbyte) + g;
|
|
g = dst[x*3+1];
|
|
dst[x*3+2] = bytestream2_get_byteu(gbyte) + b;
|
|
b = dst[x*3+2];
|
|
}
|
|
dst -= frame->linesize[0];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
av_always_inline static int fill_pixels(uint8_t **y0, uint8_t **y1,
|
|
uint8_t **u, uint8_t **v,
|
|
int ylinesize, int ulinesize, int vlinesize,
|
|
uint8_t *fill,
|
|
int *nx, int *ny, int *np, int w, int h)
|
|
{
|
|
uint8_t *y0dst = *y0;
|
|
uint8_t *y1dst = *y1;
|
|
uint8_t *udst = *u;
|
|
uint8_t *vdst = *v;
|
|
int x = *nx, y = *ny, pos = *np;
|
|
|
|
if (pos == 0) {
|
|
y0dst[2*x+0] += fill[0];
|
|
y0dst[2*x+1] += fill[1];
|
|
y1dst[2*x+0] += fill[2];
|
|
y1dst[2*x+1] += fill[3];
|
|
pos++;
|
|
} else if (pos == 1) {
|
|
udst[x] += fill[0];
|
|
vdst[x] += fill[1];
|
|
x++;
|
|
if (x >= w) {
|
|
x = 0;
|
|
y++;
|
|
if (y >= h)
|
|
return 1;
|
|
y0dst -= 2*ylinesize;
|
|
y1dst -= 2*ylinesize;
|
|
udst -= ulinesize;
|
|
vdst -= vlinesize;
|
|
}
|
|
y0dst[2*x+0] += fill[2];
|
|
y0dst[2*x+1] += fill[3];
|
|
pos++;
|
|
} else if (pos == 2) {
|
|
y1dst[2*x+0] += fill[0];
|
|
y1dst[2*x+1] += fill[1];
|
|
udst[x] += fill[2];
|
|
vdst[x] += fill[3];
|
|
x++;
|
|
if (x >= w) {
|
|
x = 0;
|
|
y++;
|
|
if (y >= h)
|
|
return 1;
|
|
y0dst -= 2*ylinesize;
|
|
y1dst -= 2*ylinesize;
|
|
udst -= ulinesize;
|
|
vdst -= vlinesize;
|
|
}
|
|
pos = 0;
|
|
}
|
|
|
|
*y0 = y0dst;
|
|
*y1 = y1dst;
|
|
*u = udst;
|
|
*v = vdst;
|
|
*np = pos;
|
|
*nx = x;
|
|
*ny = y;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_runlen_rgb(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
|
|
{
|
|
uint8_t *dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
|
|
int runlen, y = 0, x = 0;
|
|
uint8_t fill[4];
|
|
unsigned code;
|
|
|
|
while (bytestream2_get_bytes_left(gbyte) > 0) {
|
|
code = bytestream2_peek_le32(gbyte);
|
|
runlen = code & 0xFFFFFF;
|
|
|
|
if (code >> 24 == 0x77) {
|
|
bytestream2_skip(gbyte, 4);
|
|
|
|
for (int i = 0; i < 4; i++)
|
|
fill[i] = bytestream2_get_byte(gbyte);
|
|
|
|
while (runlen > 0) {
|
|
runlen--;
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
dst[x] += fill[i];
|
|
x++;
|
|
if (x >= frame->width * 3) {
|
|
x = 0;
|
|
y++;
|
|
dst -= frame->linesize[0];
|
|
if (y >= frame->height)
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
for (int i = 0; i < 4; i++)
|
|
fill[i] = bytestream2_get_byte(gbyte);
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
dst[x] += fill[i];
|
|
x++;
|
|
if (x >= frame->width * 3) {
|
|
x = 0;
|
|
y++;
|
|
dst -= frame->linesize[0];
|
|
if (y >= frame->height)
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_runlen(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
|
|
{
|
|
uint8_t *y0dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
|
|
uint8_t *y1dst = y0dst - frame->linesize[0];
|
|
uint8_t *udst = frame->data[1] + ((avctx->height >> 1) - 1) * frame->linesize[1];
|
|
uint8_t *vdst = frame->data[2] + ((avctx->height >> 1) - 1) * frame->linesize[2];
|
|
int runlen, y = 0, x = 0, pos = 0;
|
|
uint8_t fill[4];
|
|
unsigned code;
|
|
|
|
while (bytestream2_get_bytes_left(gbyte) > 0) {
|
|
code = bytestream2_peek_le32(gbyte);
|
|
runlen = code & 0xFFFFFF;
|
|
|
|
if (code >> 24 == 0x77) {
|
|
bytestream2_skip(gbyte, 4);
|
|
|
|
for (int i = 0; i < 4; i++)
|
|
fill[i] = bytestream2_get_byte(gbyte);
|
|
|
|
while (runlen > 0) {
|
|
runlen--;
|
|
|
|
if (fill_pixels(&y0dst, &y1dst, &udst, &vdst,
|
|
frame->linesize[0],
|
|
frame->linesize[1],
|
|
frame->linesize[2],
|
|
fill, &x, &y, &pos,
|
|
avctx->width / 2,
|
|
avctx->height / 2))
|
|
return 0;
|
|
}
|
|
} else {
|
|
for (int i = 0; i < 4; i++)
|
|
fill[i] = bytestream2_get_byte(gbyte);
|
|
|
|
if (fill_pixels(&y0dst, &y1dst, &udst, &vdst,
|
|
frame->linesize[0],
|
|
frame->linesize[1],
|
|
frame->linesize[2],
|
|
fill, &x, &y, &pos,
|
|
avctx->width / 2,
|
|
avctx->height / 2))
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_raw_intra(AVCodecContext *avctx, GetByteContext *gbyte, AVFrame *frame)
|
|
{
|
|
uint8_t *y0dst = frame->data[0] + (avctx->height - 1) * frame->linesize[0];
|
|
uint8_t *y1dst = y0dst - frame->linesize[0];
|
|
uint8_t *udst = frame->data[1] + ((avctx->height >> 1) - 1) * frame->linesize[1];
|
|
uint8_t *vdst = frame->data[2] + ((avctx->height >> 1) - 1) * frame->linesize[2];
|
|
uint8_t ly0 = 0, ly1 = 0, ly2 = 0, ly3 = 0, lu = 0, lv = 0;
|
|
|
|
for (int y = 0; y < avctx->height / 2; y++) {
|
|
for (int x = 0; x < avctx->width / 2; x++) {
|
|
y0dst[x*2+0] = bytestream2_get_byte(gbyte) + ly0;
|
|
ly0 = y0dst[x*2+0];
|
|
y0dst[x*2+1] = bytestream2_get_byte(gbyte) + ly1;
|
|
ly1 = y0dst[x*2+1];
|
|
y1dst[x*2+0] = bytestream2_get_byte(gbyte) + ly2;
|
|
ly2 = y1dst[x*2+0];
|
|
y1dst[x*2+1] = bytestream2_get_byte(gbyte) + ly3;
|
|
ly3 = y1dst[x*2+1];
|
|
udst[x] = bytestream2_get_byte(gbyte) + lu;
|
|
lu = udst[x];
|
|
vdst[x] = bytestream2_get_byte(gbyte) + lv;
|
|
lv = vdst[x];
|
|
}
|
|
|
|
y0dst -= 2*frame->linesize[0];
|
|
y1dst -= 2*frame->linesize[0];
|
|
udst -= frame->linesize[1];
|
|
vdst -= frame->linesize[2];
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
int ret;
|
|
|
|
compute_quant_matrix(s, (2 * s->compression - 100) / 100.0);
|
|
|
|
s->blocks_w = avctx->coded_width >> 3;
|
|
s->blocks_h = avctx->coded_height >> 3;
|
|
|
|
ret = decode_intra_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
bytestream2_skip(&s->gbyte, s->size[0]);
|
|
|
|
s->blocks_w = avctx->coded_width >> 4;
|
|
s->blocks_h = avctx->coded_height >> 4;
|
|
|
|
ret = decode_intra_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, 2);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
bytestream2_skip(&s->gbyte, s->size[1]);
|
|
|
|
s->blocks_w = avctx->coded_width >> 4;
|
|
s->blocks_h = avctx->coded_height >> 4;
|
|
|
|
ret = decode_intra_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_motion_vectors(AVCodecContext *avctx, GetBitContext *gb)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
int nb_mvs = ((avctx->coded_height + 15) >> 4) * ((avctx->coded_width + 15) >> 4);
|
|
int ret, skip = 0, value, map;
|
|
|
|
av_fast_padded_malloc(&s->mvectors, &s->mvectors_size,
|
|
nb_mvs * sizeof(*s->mvectors));
|
|
if (!s->mvectors)
|
|
return AVERROR(ENOMEM);
|
|
|
|
if ((ret = init_get_bits8(gb, s->gbyte.buffer, bytestream2_get_bytes_left(&s->gbyte) -
|
|
(s->size[0] + s->size[1] + s->size[2]))) < 0)
|
|
return ret;
|
|
|
|
memset(s->mvectors, 0, sizeof(*s->mvectors) * nb_mvs);
|
|
|
|
for (int i = 0; i < nb_mvs; i++) {
|
|
ret = read_code(gb, &skip, &value, &map, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
s->mvectors[i].x = value;
|
|
i += skip;
|
|
}
|
|
|
|
for (int i = 0; i < nb_mvs; i++) {
|
|
ret = read_code(gb, &skip, &value, &map, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
s->mvectors[i].y = value;
|
|
i += skip;
|
|
}
|
|
|
|
if (get_bits_left(gb) <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
skip = (get_bits_count(gb) >> 3) + 1;
|
|
bytestream2_skip(&s->gbyte, skip);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
|
|
AVFrame *frame, AVFrame *prev)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
int ret;
|
|
|
|
compute_quant_matrix(s, (2 * s->compression - 100) / 100.0);
|
|
|
|
if (s->flags & 2) {
|
|
ret = decode_motion_vectors(avctx, gb);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
s->blocks_w = avctx->coded_width >> 3;
|
|
s->blocks_h = avctx->coded_height >> 3;
|
|
|
|
ret = decode_inter_plane(s, gb, s->size[0], s->luma_quant_matrix, frame, prev, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
bytestream2_skip(&s->gbyte, s->size[0]);
|
|
|
|
s->blocks_w = avctx->coded_width >> 4;
|
|
s->blocks_h = avctx->coded_height >> 4;
|
|
|
|
ret = decode_inter_plane(s, gb, s->size[1], s->chroma_quant_matrix, frame, prev, 2);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
bytestream2_skip(&s->gbyte, s->size[1]);
|
|
|
|
s->blocks_w = avctx->coded_width >> 4;
|
|
s->blocks_h = avctx->coded_height >> 4;
|
|
|
|
ret = decode_inter_plane(s, gb, s->size[2], s->chroma_quant_matrix, frame, prev, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return 0;
|
|
}
|
|
|
|
typedef struct Node {
|
|
int parent;
|
|
int child[2];
|
|
} Node;
|
|
|
|
static void get_tree_codes(uint32_t *codes, Node *nodes, int idx, uint32_t pfx, int bitpos)
|
|
{
|
|
if (idx < 256 && idx >= 0) {
|
|
codes[idx] = pfx;
|
|
} else if (idx >= 0) {
|
|
get_tree_codes(codes, nodes, nodes[idx].child[0], pfx + (0 << bitpos), bitpos + 1);
|
|
get_tree_codes(codes, nodes, nodes[idx].child[1], pfx + (1U << bitpos), bitpos + 1);
|
|
}
|
|
}
|
|
|
|
static int make_new_tree(const uint8_t *bitlens, uint32_t *codes)
|
|
{
|
|
int zlcount = 0, curlen, idx, nindex, last, llast;
|
|
int blcounts[32] = { 0 };
|
|
int syms[8192];
|
|
Node nodes[512];
|
|
int node_idx[1024];
|
|
int old_idx[512];
|
|
|
|
for (int i = 0; i < 256; i++) {
|
|
int bitlen = bitlens[i];
|
|
int blcount = blcounts[bitlen];
|
|
|
|
zlcount += bitlen < 1;
|
|
syms[(bitlen << 8) + blcount] = i;
|
|
blcounts[bitlen]++;
|
|
}
|
|
|
|
for (int i = 0; i < 512; i++) {
|
|
nodes[i].child[0] = -1;
|
|
nodes[i].child[1] = -1;
|
|
}
|
|
|
|
for (int i = 0; i < 256; i++) {
|
|
node_idx[i] = 257 + i;
|
|
}
|
|
|
|
curlen = 1;
|
|
node_idx[512] = 256;
|
|
last = 255;
|
|
nindex = 1;
|
|
|
|
for (curlen = 1; curlen < 32; curlen++) {
|
|
if (blcounts[curlen] > 0) {
|
|
int max_zlcount = zlcount + blcounts[curlen];
|
|
|
|
for (int i = 0; zlcount < 256 && zlcount < max_zlcount; zlcount++, i++) {
|
|
int p = node_idx[nindex - 1 + 512];
|
|
int ch = syms[256 * curlen + i];
|
|
|
|
if (nindex <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (nodes[p].child[0] == -1) {
|
|
nodes[p].child[0] = ch;
|
|
} else {
|
|
nodes[p].child[1] = ch;
|
|
nindex--;
|
|
}
|
|
nodes[ch].parent = p;
|
|
}
|
|
}
|
|
llast = last - 1;
|
|
idx = 0;
|
|
while (nindex > 0) {
|
|
int p, ch;
|
|
|
|
last = llast - idx;
|
|
p = node_idx[nindex - 1 + 512];
|
|
ch = node_idx[last];
|
|
if (nodes[p].child[0] == -1) {
|
|
nodes[p].child[0] = ch;
|
|
} else {
|
|
nodes[p].child[1] = ch;
|
|
nindex--;
|
|
}
|
|
old_idx[idx] = ch;
|
|
nodes[ch].parent = p;
|
|
if (idx == llast)
|
|
goto next;
|
|
idx++;
|
|
if (nindex <= 0) {
|
|
for (int i = 0; i < idx; i++)
|
|
node_idx[512 + i] = old_idx[i];
|
|
}
|
|
}
|
|
nindex = idx;
|
|
}
|
|
|
|
next:
|
|
|
|
get_tree_codes(codes, nodes, 256, 0, 0);
|
|
return 0;
|
|
}
|
|
|
|
static int build_huff(const uint8_t *bitlen, VLC *vlc)
|
|
{
|
|
uint32_t new_codes[256];
|
|
uint8_t bits[256];
|
|
uint8_t symbols[256];
|
|
uint32_t codes[256];
|
|
int nb_codes = 0;
|
|
|
|
int ret = make_new_tree(bitlen, new_codes);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
for (int i = 0; i < 256; i++) {
|
|
if (bitlen[i]) {
|
|
bits[nb_codes] = bitlen[i];
|
|
codes[nb_codes] = new_codes[i];
|
|
symbols[nb_codes] = i;
|
|
nb_codes++;
|
|
}
|
|
}
|
|
|
|
ff_free_vlc(vlc);
|
|
return ff_init_vlc_sparse(vlc, 13, nb_codes,
|
|
bits, 1, 1,
|
|
codes, 4, 4,
|
|
symbols, 1, 1,
|
|
INIT_VLC_LE);
|
|
}
|
|
|
|
static int decode_huffman2(AVCodecContext *avctx, int header, int size)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
GetBitContext *gb = &s->gb;
|
|
uint8_t lens[256];
|
|
int ret, x, len;
|
|
|
|
if ((ret = init_get_bits8(gb, s->gbyte.buffer,
|
|
bytestream2_get_bytes_left(&s->gbyte))) < 0)
|
|
return ret;
|
|
|
|
s->output_size = get_bits_long(gb, 32);
|
|
|
|
if (s->output_size > avctx->width * avctx->height * 9LL + 10000)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
av_fast_padded_malloc(&s->output, &s->padded_output_size, s->output_size);
|
|
if (!s->output)
|
|
return AVERROR(ENOMEM);
|
|
|
|
x = get_bits(gb, 1);
|
|
len = 4 + get_bits(gb, 1);
|
|
if (x) {
|
|
int cb[8] = { 0 };
|
|
int count = get_bits(gb, 3) + 1;
|
|
|
|
for (int i = 0; i < count; i++)
|
|
cb[i] = get_bits(gb, len);
|
|
|
|
for (int i = 0; i < 256; i++) {
|
|
int idx = get_bits(gb, 3);
|
|
lens[i] = cb[idx];
|
|
}
|
|
} else {
|
|
for (int i = 0; i < 256; i++)
|
|
lens[i] = get_bits(gb, len);
|
|
}
|
|
|
|
if ((ret = build_huff(lens, &s->vlc)) < 0)
|
|
return ret;
|
|
|
|
x = 0;
|
|
while (get_bits_left(gb) > 0 && x < s->output_size) {
|
|
int val = get_vlc2(gb, s->vlc.table, s->vlc.bits, 3);
|
|
if (val < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
s->output[x++] = val;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int decode_frame(AVCodecContext *avctx, void *data,
|
|
int *got_frame, AVPacket *avpkt)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
GetBitContext *gb = &s->gb;
|
|
GetByteContext *gbyte = &s->gbyte;
|
|
AVFrame *frame = data;
|
|
int w, h, width, height, header;
|
|
unsigned compressed_size;
|
|
long skip;
|
|
int ret;
|
|
|
|
if (!avpkt->size)
|
|
return 0;
|
|
|
|
bytestream2_init(gbyte, avpkt->data, avpkt->size);
|
|
|
|
header = bytestream2_get_le32(gbyte);
|
|
s->fflags = bytestream2_get_le32(gbyte);
|
|
s->bitstream_size = s->fflags & 0x1FFFFFFF;
|
|
s->fflags >>= 29;
|
|
av_log(avctx, AV_LOG_DEBUG, "fflags: %X\n", s->fflags);
|
|
if (avpkt->size < s->bitstream_size + 8)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
s->key_frame = (avpkt->flags & AV_PKT_FLAG_KEY);
|
|
frame->key_frame = s->key_frame;
|
|
frame->pict_type = s->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
|
|
|
|
if (!s->key_frame) {
|
|
if (!s->prev_frame->data[0]) {
|
|
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
if (header) {
|
|
if (avctx->codec_tag == MKTAG('A', 'G', 'M', '0') ||
|
|
avctx->codec_tag == MKTAG('A', 'G', 'M', '1'))
|
|
return AVERROR_PATCHWELCOME;
|
|
else
|
|
ret = decode_huffman2(avctx, header, (avpkt->size - s->bitstream_size) - 8);
|
|
if (ret < 0)
|
|
return ret;
|
|
bytestream2_init(gbyte, s->output, s->output_size);
|
|
} else if (!s->dct) {
|
|
bytestream2_skip(gbyte, 4);
|
|
}
|
|
|
|
if (s->dct) {
|
|
s->flags = 0;
|
|
w = bytestream2_get_le32(gbyte);
|
|
h = bytestream2_get_le32(gbyte);
|
|
if (w == INT32_MIN || h == INT32_MIN)
|
|
return AVERROR_INVALIDDATA;
|
|
if (w < 0) {
|
|
w = -w;
|
|
s->flags |= 2;
|
|
}
|
|
if (h < 0) {
|
|
h = -h;
|
|
s->flags |= 1;
|
|
}
|
|
|
|
width = avctx->width;
|
|
height = avctx->height;
|
|
if (w < width || h < height || w & 7 || h & 7)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
ret = ff_set_dimensions(avctx, w, h);
|
|
if (ret < 0)
|
|
return ret;
|
|
avctx->width = width;
|
|
avctx->height = height;
|
|
|
|
s->compression = bytestream2_get_le32(gbyte);
|
|
if (s->compression < 0 || s->compression > 100)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
for (int i = 0; i < 3; i++)
|
|
s->size[i] = bytestream2_get_le32(gbyte);
|
|
if (header) {
|
|
compressed_size = s->output_size;
|
|
skip = 8LL;
|
|
} else {
|
|
compressed_size = avpkt->size;
|
|
skip = 32LL;
|
|
}
|
|
if (s->size[0] < 0 || s->size[1] < 0 || s->size[2] < 0 ||
|
|
skip + s->size[0] + s->size[1] + s->size[2] > compressed_size) {
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
|
|
return ret;
|
|
|
|
if (frame->key_frame) {
|
|
if (!s->dct && !s->rgb)
|
|
ret = decode_raw_intra(avctx, gbyte, frame);
|
|
else if (!s->dct && s->rgb)
|
|
ret = decode_raw_intra_rgb(avctx, gbyte, frame);
|
|
else
|
|
ret = decode_intra(avctx, gb, frame);
|
|
} else {
|
|
if (s->prev_frame-> width != frame->width ||
|
|
s->prev_frame->height != frame->height)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (!(s->flags & 2)) {
|
|
ret = av_frame_copy(frame, s->prev_frame);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (s->dct) {
|
|
ret = decode_inter(avctx, gb, frame, s->prev_frame);
|
|
} else if (!s->dct && !s->rgb) {
|
|
ret = decode_runlen(avctx, gbyte, frame);
|
|
} else {
|
|
ret = decode_runlen_rgb(avctx, gbyte, frame);
|
|
}
|
|
}
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
av_frame_unref(s->prev_frame);
|
|
if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
|
|
return ret;
|
|
|
|
frame->crop_top = avctx->coded_height - avctx->height;
|
|
frame->crop_left = avctx->coded_width - avctx->width;
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int decode_init(AVCodecContext *avctx)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
|
|
s->rgb = avctx->codec_tag == MKTAG('A', 'G', 'M', '4');
|
|
avctx->pix_fmt = s->rgb ? AV_PIX_FMT_BGR24 : AV_PIX_FMT_YUV420P;
|
|
s->avctx = avctx;
|
|
s->plus = avctx->codec_tag == MKTAG('A', 'G', 'M', '3') ||
|
|
avctx->codec_tag == MKTAG('A', 'G', 'M', '7');
|
|
|
|
s->dct = avctx->codec_tag != MKTAG('A', 'G', 'M', '4') &&
|
|
avctx->codec_tag != MKTAG('A', 'G', 'M', '5');
|
|
|
|
if (!s->rgb && !s->dct) {
|
|
if ((avctx->width & 1) || (avctx->height & 1))
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
avctx->idct_algo = FF_IDCT_SIMPLE;
|
|
ff_idctdsp_init(&s->idsp, avctx);
|
|
ff_init_scantable(s->idsp.idct_permutation, &s->scantable, ff_zigzag_direct);
|
|
|
|
s->prev_frame = av_frame_alloc();
|
|
if (!s->prev_frame)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void decode_flush(AVCodecContext *avctx)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
|
|
av_frame_unref(s->prev_frame);
|
|
}
|
|
|
|
static av_cold int decode_close(AVCodecContext *avctx)
|
|
{
|
|
AGMContext *s = avctx->priv_data;
|
|
|
|
ff_free_vlc(&s->vlc);
|
|
av_frame_free(&s->prev_frame);
|
|
av_freep(&s->mvectors);
|
|
s->mvectors_size = 0;
|
|
av_freep(&s->wblocks);
|
|
s->wblocks_size = 0;
|
|
av_freep(&s->output);
|
|
s->padded_output_size = 0;
|
|
av_freep(&s->map);
|
|
s->map_size = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const AVCodec ff_agm_decoder = {
|
|
.name = "agm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Amuse Graphics Movie"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_AGM,
|
|
.priv_data_size = sizeof(AGMContext),
|
|
.init = decode_init,
|
|
.close = decode_close,
|
|
.decode = decode_frame,
|
|
.flush = decode_flush,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
|
|
FF_CODEC_CAP_INIT_CLEANUP |
|
|
FF_CODEC_CAP_EXPORTS_CROPPING,
|
|
};
|