mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-09-04 15:28:19 +02:00
534 lines
16 KiB
C
534 lines
16 KiB
C
/*
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* Copyright (c) 2021 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 "libavutil/common.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "bytestream.h"
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#include "internal.h"
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#define PALDATA_FOLLOWS_TILEDATA 4
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#define HAVE_COMPRESSED_TILEMAP 32
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#define HAVE_TILEMAP 128
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typedef struct SGAVideoContext {
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GetByteContext gb;
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int metadata_size;
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int tiledata_size;
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int tiledata_offset;
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int tilemapdata_size;
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int tilemapdata_offset;
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int paldata_size;
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int paldata_offset;
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int palmapdata_offset;
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int palmapdata_size;
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int flags;
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int nb_pal;
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int nb_tiles;
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int tiles_w, tiles_h;
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int shift;
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int plus;
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int swap;
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uint32_t pal[256];
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uint8_t *tileindex_data;
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unsigned tileindex_size;
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uint8_t *palmapindex_data;
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unsigned palmapindex_size;
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uint8_t uncompressed[65536];
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} SGAVideoContext;
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static av_cold int sga_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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return 0;
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}
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static int decode_palette(GetByteContext *gb, uint32_t *pal)
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{
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GetBitContext gbit;
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if (bytestream2_get_bytes_left(gb) < 18)
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return AVERROR_INVALIDDATA;
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memset(pal, 0, 16 * sizeof(*pal));
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init_get_bits8(&gbit, gb->buffer, 18);
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for (int RGBIndex = 0; RGBIndex < 3; RGBIndex++) {
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for (int index = 0; index < 16; index++) {
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unsigned color = get_bits1(&gbit) << RGBIndex;
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pal[15 - index] |= color << (5 + 16);
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}
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}
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for (int RGBIndex = 0; RGBIndex < 3; RGBIndex++) {
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for (int index = 0; index < 16; index++) {
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unsigned color = get_bits1(&gbit) << RGBIndex;
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pal[15 - index] |= color << (5 + 8);
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}
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}
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for (int RGBIndex = 0; RGBIndex < 3; RGBIndex++) {
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for (int index = 0; index < 16; index++) {
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unsigned color = get_bits1(&gbit) << RGBIndex;
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pal[15 - index] |= color << (5 + 0);
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}
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}
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for (int index = 0; index < 16; index++)
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pal[index] = (0xFFU << 24) | pal[index] | (pal[index] >> 3);
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bytestream2_skip(gb, 18);
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return 0;
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}
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static int decode_index_palmap(SGAVideoContext *s, AVFrame *frame)
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{
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const uint8_t *tt = s->tileindex_data;
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for (int y = 0; y < s->tiles_h; y++) {
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for (int x = 0; x < s->tiles_w; x++) {
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int pal_idx = s->palmapindex_data[y * s->tiles_w + x] * 16;
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uint8_t *dst = frame->data[0] + y * 8 * frame->linesize[0] + x * 8;
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for (int yy = 0; yy < 8; yy++) {
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for (int xx = 0; xx < 8; xx++)
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dst[xx] = pal_idx + tt[xx];
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tt += 8;
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dst += frame->linesize[0];
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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_index_tilemap(SGAVideoContext *s, AVFrame *frame)
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{
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GetByteContext *gb = &s->gb;
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GetBitContext pm;
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bytestream2_seek(gb, s->tilemapdata_offset, SEEK_SET);
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if (bytestream2_get_bytes_left(gb) < s->tilemapdata_size)
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return AVERROR_INVALIDDATA;
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init_get_bits8(&pm, gb->buffer, s->tilemapdata_size);
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for (int y = 0; y < s->tiles_h; y++) {
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for (int x = 0; x < s->tiles_w; x++) {
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uint8_t tile[64];
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int tilemap = get_bits(&pm, 16);
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int flip_x = (tilemap >> 11) & 1;
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int flip_y = (tilemap >> 12) & 1;
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int tindex = av_clip((tilemap & 511) - 1, 0, s->nb_tiles - 1);
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const uint8_t *tt = s->tileindex_data + tindex * 64;
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int pal_idx = ((tilemap >> 13) & 3) * 16;
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uint8_t *dst = frame->data[0] + y * 8 * frame->linesize[0] + x * 8;
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if (!flip_x && !flip_y) {
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memcpy(tile, tt, 64);
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} else if (flip_x && flip_y) {
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for (int i = 0; i < 8; i++) {
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for (int j = 0; j < 8; j++)
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tile[i * 8 + j] = tt[(7 - i) * 8 + 7 - j];
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}
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} else if (flip_x) {
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for (int i = 0; i < 8; i++) {
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for (int j = 0; j < 8; j++)
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tile[i * 8 + j] = tt[i * 8 + 7 - j];
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}
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} else {
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for (int i = 0; i < 8; i++) {
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for (int j = 0; j < 8; j++)
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tile[i * 8 + j] = tt[(7 - i) * 8 + j];
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}
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}
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for (int yy = 0; yy < 8; yy++) {
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for (int xx = 0; xx < 8; xx++)
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dst[xx] = pal_idx + tile[xx + yy * 8];
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dst += frame->linesize[0];
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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_index(SGAVideoContext *s, AVFrame *frame)
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{
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const uint8_t *src = s->tileindex_data;
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uint8_t *dst = frame->data[0];
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for (int y = 0; y < frame->height; y += 8) {
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for (int x = 0; x < frame->width; x += 8) {
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for (int yy = 0; yy < 8; yy++) {
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for (int xx = 0; xx < 8; xx++)
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dst[x + xx + yy * frame->linesize[0]] = src[xx];
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src += 8;
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}
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}
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dst += 8 * frame->linesize[0];
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}
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return 0;
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}
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static int lzss_decompress(AVCodecContext *avctx,
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GetByteContext *gb, uint8_t *dst,
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int dst_size, int shift, int plus)
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{
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int oi = 0;
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while (bytestream2_get_bytes_left(gb) > 0 && oi < dst_size) {
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uint16_t displace, header = bytestream2_get_be16(gb);
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int count, offset;
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for (int i = 0; i < 16; i++) {
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switch (header >> 15) {
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case 0:
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if (oi + 2 < dst_size) {
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dst[oi++] = bytestream2_get_byte(gb);
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dst[oi++] = bytestream2_get_byte(gb);
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}
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break;
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case 1:
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displace = bytestream2_get_be16(gb);
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count = displace >> shift;
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offset = displace & ((1 << shift) - 1);
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if (displace == 0) {
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while (bytestream2_get_bytes_left(gb) > 0 &&
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oi < dst_size)
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dst[oi++] = bytestream2_get_byte(gb);
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return oi;
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}
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count += plus;
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if (offset <= 0)
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offset = 1;
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if (oi < offset || oi + count * 2 > dst_size)
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return AVERROR_INVALIDDATA;
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for (int j = 0; j < count * 2; j++) {
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dst[oi] = dst[oi - offset];
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oi++;
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}
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break;
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}
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header <<= 1;
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}
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}
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return AVERROR_INVALIDDATA;
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}
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static int decode_palmapdata(AVCodecContext *avctx)
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{
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SGAVideoContext *s = avctx->priv_data;
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const int bits = (s->nb_pal + 1) / 2;
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GetByteContext *gb = &s->gb;
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GetBitContext pm;
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bytestream2_seek(gb, s->palmapdata_offset, SEEK_SET);
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if (bytestream2_get_bytes_left(gb) < s->palmapdata_size)
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return AVERROR_INVALIDDATA;
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init_get_bits8(&pm, gb->buffer, s->palmapdata_size);
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for (int y = 0; y < s->tiles_h; y++) {
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uint8_t *dst = s->palmapindex_data + y * s->tiles_w;
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for (int x = 0; x < s->tiles_w; x++)
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dst[x] = get_bits(&pm, bits);
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dst += s->tiles_w;
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}
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return 0;
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}
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static int decode_tiledata(AVCodecContext *avctx)
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{
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SGAVideoContext *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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GetBitContext tm;
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bytestream2_seek(gb, s->tiledata_offset, SEEK_SET);
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if (bytestream2_get_bytes_left(gb) < s->tiledata_size)
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return AVERROR_INVALIDDATA;
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init_get_bits8(&tm, gb->buffer, s->tiledata_size);
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for (int n = 0; n < s->nb_tiles; n++) {
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uint8_t *dst = s->tileindex_data + n * 64;
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for (int yy = 0; yy < 8; yy++) {
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for (int xx = 0; xx < 8; xx++)
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dst[xx] = get_bits(&tm, 4);
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dst += 8;
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}
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}
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for (int i = 0; i < s->nb_tiles && s->swap; i++) {
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uint8_t *dst = s->tileindex_data + i * 64;
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for (int j = 8; j < 64; j += 16) {
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for (int k = 0; k < 8; k += 2)
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FFSWAP(uint8_t, dst[j + k], dst[j+k+1]);
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}
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}
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return 0;
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}
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static int sga_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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SGAVideoContext *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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AVFrame *frame = data;
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int ret, type;
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if (avpkt->size <= 14)
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return AVERROR_INVALIDDATA;
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s->flags = avpkt->data[8];
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s->nb_pal = avpkt->data[9];
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s->tiles_w = avpkt->data[10];
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s->tiles_h = avpkt->data[11];
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if (s->nb_pal > 4)
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return AVERROR_INVALIDDATA;
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if ((ret = ff_set_dimensions(avctx,
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s->tiles_w * 8,
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s->tiles_h * 8)) < 0)
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return ret;
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av_fast_padded_malloc(&s->tileindex_data, &s->tileindex_size,
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avctx->width * avctx->height);
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if (!s->tileindex_data)
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return AVERROR(ENOMEM);
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av_fast_padded_malloc(&s->palmapindex_data, &s->palmapindex_size,
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s->tiles_w * s->tiles_h);
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if (!s->palmapindex_data)
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return AVERROR(ENOMEM);
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if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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bytestream2_init(gb, avpkt->data, avpkt->size);
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type = bytestream2_get_byte(gb);
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s->metadata_size = 12 + ((!!(s->flags & HAVE_TILEMAP)) * 2);
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s->nb_tiles = s->flags & HAVE_TILEMAP ? AV_RB16(avpkt->data + 12) : s->tiles_w * s->tiles_h;
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if (s->nb_tiles > s->tiles_w * s->tiles_h)
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return AVERROR_INVALIDDATA;
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av_log(avctx, AV_LOG_DEBUG, "type: %X flags: %X nb_tiles: %d\n", type, s->flags, s->nb_tiles);
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switch (type) {
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case 0xE7:
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case 0xCB:
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case 0xCD:
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s->swap = 1;
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s->shift = 12;
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s->plus = 1;
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break;
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case 0xC9:
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s->swap = 1;
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s->shift = 13;
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s->plus = 1;
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break;
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case 0xC8:
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s->swap = 1;
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s->shift = 13;
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s->plus = 0;
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break;
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case 0xC7:
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s->swap = 0;
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s->shift = 13;
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s->plus = 1;
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break;
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case 0xC6:
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s->swap = 0;
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s->shift = 13;
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s->plus = 0;
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break;
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}
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if (type == 0xE7) {
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int offset = s->metadata_size, left;
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int sizes[3];
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bytestream2_seek(gb, s->metadata_size, SEEK_SET);
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for (int i = 0; i < 3; i++)
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sizes[i] = bytestream2_get_be16(gb);
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for (int i = 0; i < 3; i++) {
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int size = sizes[i];
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int raw = size >> 15;
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size &= (1 << 15) - 1;
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if (raw) {
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if (bytestream2_get_bytes_left(gb) < size)
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return AVERROR_INVALIDDATA;
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if (sizeof(s->uncompressed) - offset < size)
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return AVERROR_INVALIDDATA;
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memcpy(s->uncompressed + offset, gb->buffer, size);
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bytestream2_skip(gb, size);
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} else {
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GetByteContext gb2;
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if (bytestream2_get_bytes_left(gb) < size)
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return AVERROR_INVALIDDATA;
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bytestream2_init(&gb2, gb->buffer, size);
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ret = lzss_decompress(avctx, &gb2, s->uncompressed + offset,
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sizeof(s->uncompressed) - offset, s->shift, s->plus);
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if (ret < 0)
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return ret;
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bytestream2_skip(gb, size);
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size = ret;
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}
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offset += size;
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}
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left = bytestream2_get_bytes_left(gb);
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if (sizeof(s->uncompressed) - offset < left)
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return AVERROR_INVALIDDATA;
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bytestream2_get_buffer(gb, s->uncompressed + offset, left);
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offset += left;
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bytestream2_init(gb, s->uncompressed, offset);
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}
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switch (type) {
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case 0xCD:
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case 0xCB:
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case 0xC9:
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case 0xC8:
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case 0xC7:
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case 0xC6:
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bytestream2_seek(gb, s->metadata_size, SEEK_SET);
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ret = lzss_decompress(avctx, gb, s->uncompressed + s->metadata_size,
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sizeof(s->uncompressed) - s->metadata_size, s->shift, s->plus);
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if (ret < 0)
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return ret;
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bytestream2_init(gb, s->uncompressed, ret + s->metadata_size);
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case 0xE7:
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case 0xC1:
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s->tiledata_size = s->nb_tiles * 32;
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s->paldata_size = s->nb_pal * 18;
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s->tiledata_offset = s->flags & PALDATA_FOLLOWS_TILEDATA ? s->metadata_size : s->metadata_size + s->paldata_size;
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s->paldata_offset = s->flags & PALDATA_FOLLOWS_TILEDATA ? s->metadata_size + s->tiledata_size : s->metadata_size;
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s->palmapdata_offset = (s->flags & HAVE_TILEMAP) ? -1 : s->paldata_offset + s->paldata_size;
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s->palmapdata_size = (s->flags & HAVE_TILEMAP) || s->nb_pal < 2 ? 0 : (s->tiles_w * s->tiles_h * ((s->nb_pal + 1) / 2) + 7) / 8;
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s->tilemapdata_size = (s->flags & HAVE_TILEMAP) ? s->tiles_w * s->tiles_h * 2 : 0;
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s->tilemapdata_offset = (s->flags & HAVE_TILEMAP) ? s->paldata_offset + s->paldata_size: -1;
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bytestream2_seek(gb, s->paldata_offset, SEEK_SET);
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for (int n = 0; n < s->nb_pal; n++) {
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ret = decode_palette(gb, s->pal + 16 * n);
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if (ret < 0)
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return ret;
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}
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if (s->tiledata_size > 0) {
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ret = decode_tiledata(avctx);
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if (ret < 0)
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return ret;
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}
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if (s->palmapdata_size > 0) {
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ret = decode_palmapdata(avctx);
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if (ret < 0)
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return ret;
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}
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if (s->palmapdata_size > 0 && s->tiledata_size > 0) {
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ret = decode_index_palmap(s, frame);
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if (ret < 0)
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return ret;
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} else if (s->tilemapdata_size > 0 && s->tiledata_size > 0) {
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ret = decode_index_tilemap(s, frame);
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if (ret < 0)
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return ret;
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} else if (s->tiledata_size > 0) {
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ret = decode_index(s, frame);
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if (ret < 0)
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return ret;
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}
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unknown type: %X\n", type);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
memcpy(frame->data[1], s->pal, AVPALETTE_SIZE);
|
|
frame->palette_has_changed = 1;
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
frame->key_frame = 1;
|
|
|
|
*got_frame = 1;
|
|
|
|
return avpkt->size;
|
|
}
|
|
|
|
static av_cold int sga_decode_end(AVCodecContext *avctx)
|
|
{
|
|
SGAVideoContext *s = avctx->priv_data;
|
|
|
|
av_freep(&s->tileindex_data);
|
|
s->tileindex_size = 0;
|
|
|
|
av_freep(&s->palmapindex_data);
|
|
s->palmapindex_size = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const AVCodec ff_sga_decoder = {
|
|
.name = "sga",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Digital Pictures SGA Video"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_SGA_VIDEO,
|
|
.priv_data_size = sizeof(SGAVideoContext),
|
|
.init = sga_decode_init,
|
|
.decode = sga_decode_frame,
|
|
.close = sga_decode_end,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
|
|
};
|