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https://github.com/FFmpeg/FFmpeg.git
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475 lines
14 KiB
C
475 lines
14 KiB
C
/*
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* Kodak PhotoCD (a.k.a. ImagePac) image decoder
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*
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* Copyright (c) 1996-2002 Gerd Knorr
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* Copyright (c) 2010 Kenneth Vermeirsch
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* Copyright (c) 2020 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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/**
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* @file
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* Kodak PhotoCD (a.k.a. ImagePac) image decoder
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*
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* Supports resolutions up to 3072x2048.
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*/
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#define CACHED_BITSTREAM_READER !ARCH_X86_32
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#include "libavutil/avassert.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "get_bits.h"
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#include "internal.h"
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#include "thread.h"
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typedef struct PhotoCDContext {
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AVClass *class;
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int lowres;
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GetByteContext gb;
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int thumbnails; //* number of thumbnails; 0 for normal image */
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int resolution;
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int orientation;
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int streampos;
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uint8_t bits[256];
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uint16_t codes[256];
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uint8_t syms[256];
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VLC vlc[3];
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} PhotoCDContext;
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typedef struct ImageInfo {
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uint32_t start;
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uint16_t width, height;
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} ImageInfo;
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static const ImageInfo img_info[6] = {
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{8192, 192, 128},
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{47104, 384, 256},
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{196608, 768, 512},
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{0, 1536, 1024},
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{0, 3072, 2048},
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{0, 6144, 4096},
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};
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static av_noinline void interp_lowres(PhotoCDContext *s, AVFrame *picture,
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int width, int height)
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{
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GetByteContext *gb = &s->gb;
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int start = s->streampos + img_info[2].start;
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uint8_t *ptr, *ptr1, *ptr2;
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uint8_t *dst;
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int fill;
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ptr = picture->data[0];
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ptr1 = picture->data[1];
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ptr2 = picture->data[2];
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bytestream2_seek(gb, start, SEEK_SET);
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for (int y = 0; y < height; y += 2) {
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dst = ptr;
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for (int x = 0; x < width - 1; x++) {
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
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}
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = fill;
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ptr += picture->linesize[0] << 1;
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dst = ptr;
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for (int x = 0; x < width - 1; x++) {
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
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}
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = fill;
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ptr += picture->linesize[0] << 1;
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dst = ptr1;
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for (int x = 0; x < (width >> 1) - 1; x++) {
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
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}
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = fill;
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ptr1 += picture->linesize[1] << 1;
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dst = ptr2;
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for (int x = 0; x < (width >> 1) - 1; x++) {
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = (fill + bytestream2_peek_byte(gb) + 1) >> 1;
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}
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fill = bytestream2_get_byte(gb);
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*(dst++) = fill;
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*(dst++) = fill;
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ptr2 += picture->linesize[2] << 1;
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}
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s->streampos += bytestream2_tell(gb) - start;
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}
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static av_noinline void interp_lines(uint8_t *ptr, int linesize,
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int width, int height)
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{
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const uint8_t *src1;
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uint8_t *dst;
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int x;
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for (int y = 0; y < height - 2; y += 2) {
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const uint8_t *src1 = ptr;
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uint8_t *dst = ptr + linesize;
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const uint8_t *src2 = dst + linesize;
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for (x = 0; x < width - 2; x += 2) {
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dst[x] = (src1[x] + src2[x] + 1) >> 1;
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dst[x + 1] = (src1[x] + src2[x] + src1[x + 2] + src2[x + 2] + 2) >> 2;
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}
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dst[x] = dst[x + 1] = (src1[x] + src2[x] + 1) >> 1;
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ptr += linesize << 1;
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}
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src1 = ptr;
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dst = ptr + linesize;
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for (x = 0; x < width - 2; x += 2) {
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dst[x] = src1[x];
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dst[x + 1] = (src1[x] + src1[x + 2] + 1) >> 1;
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}
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dst[x] = dst[x + 1] = src1[x];
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}
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static av_noinline void interp_pixels(uint8_t *ptr, int linesize,
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int width, int height)
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{
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for (int y = height - 2; y >= 0; y -= 2) {
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const uint8_t *src = ptr + (y >> 1) * linesize;
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uint8_t *dst = ptr + y * linesize;
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dst[width - 2] = dst[width - 1] = src[(width >> 1) - 1];
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for (int x = width - 4; x >= 0; x -= 2) {
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dst[x] = src[x >> 1];
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dst[x + 1] = (src[x >> 1] + src[(x >> 1) + 1] + 1) >> 1;
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}
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}
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}
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static av_noinline int read_hufftable(AVCodecContext *avctx, VLC *vlc)
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{
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PhotoCDContext *s = avctx->priv_data;
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GetByteContext *gb = &s->gb;
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int start = s->streampos;
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int count, ret;
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bytestream2_seek(gb, start, SEEK_SET);
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count = bytestream2_get_byte(gb) + 1;
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if (bytestream2_get_bytes_left(gb) < count * 4)
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return AVERROR_INVALIDDATA;
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for (int j = 0; j < count; j++) {
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const int bit = bytestream2_get_byteu(gb) + 1;
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const int code = bytestream2_get_be16u(gb);
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const int sym = bytestream2_get_byteu(gb);
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if (bit > 16)
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return AVERROR_INVALIDDATA;
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s->bits[j] = bit;
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s->codes[j] = code >> (16 - bit);
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s->syms[j] = sym;
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}
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ff_free_vlc(vlc);
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ret = ff_init_vlc_sparse(vlc, 12, count,
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s->bits, sizeof(*s->bits), sizeof(*s->bits),
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s->codes, sizeof(*s->codes), sizeof(*s->codes),
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s->syms, sizeof(*s->syms), sizeof(*s->syms), 0);
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s->streampos = bytestream2_tell(gb);
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return ret;
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}
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static av_noinline int decode_huff(AVCodecContext *avctx, AVFrame *frame,
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int target_res, int curr_res)
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{
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PhotoCDContext *s = avctx->priv_data;
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GetBitContext g;
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GetByteContext *gb = &s->gb;
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int ret, y = 0, type, height, y2;
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int start = s->streampos;
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unsigned shiftreg, bit;
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const int scaling = target_res - curr_res;
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const uint8_t type2idx[] = { 0, 0xff, 1, 2 };
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bytestream2_seek(gb, start, SEEK_SET);
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ret = init_get_bits8(&g, gb->buffer, bytestream2_get_bytes_left(gb));
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if (ret < 0)
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return ret;
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height = img_info[curr_res].height;
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y2 = avctx->height >> scaling;
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while (y < height) {
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uint8_t *data;
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int x2, idx;
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bit = 0;
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for (; get_bits_left(&g) > 0;) {
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if ((show_bits(&g, 24) & 0xfff000) == 0xfff000)
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break;
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skip_bits(&g, 8);
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}
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shiftreg = show_bits_long(&g, 32) & 0xffffff00;
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while (shiftreg != 0xfffffe00) {
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if (get_bits_left(&g) <= 0)
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return AVERROR_INVALIDDATA;
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skip_bits(&g, 1);
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shiftreg = show_bits_long(&g, 32) & 0xffffff00;
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}
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skip_bits(&g, 16);
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y = show_bits_long(&g, 23) & 0x1fff;
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skip_bits(&g, 8);
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if (y >= height)
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break;
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type = get_bits(&g, 2);
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skip_bits(&g, 14);
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if (type == 1)
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return AVERROR_INVALIDDATA;
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idx = type2idx[type];
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data = frame->data[idx] + (y >> !!idx) * frame->linesize[idx];
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x2 = avctx->width >> (scaling + !!idx);
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for (int x = 0; x < x2; x++) {
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int m;
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if (get_bits_left(&g) <= 0)
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return AVERROR_INVALIDDATA;
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m = get_vlc2(&g, s->vlc[idx].table, s->vlc[idx].bits, 2);
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if (m < 0)
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return AVERROR_INVALIDDATA;
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m = sign_extend(m, 8);
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data[x] = av_clip_uint8(data[x] + m);
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}
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}
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s->streampos += (get_bits_count(&g) + 7) >> 3;
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s->streampos = (s->streampos + 0x6000 + 2047) & ~0x7ff;
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return 0;
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}
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static int photocd_decode_frame(AVCodecContext *avctx, void *data,
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int *got_frame, AVPacket *avpkt)
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{
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PhotoCDContext *s = avctx->priv_data;
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ThreadFrame frame = { .f = data };
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const uint8_t *buf = avpkt->data;
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GetByteContext *gb = &s->gb;
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AVFrame *p = data;
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uint8_t *ptr, *ptr1, *ptr2;
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int ret;
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if (avpkt->size < img_info[0].start)
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return AVERROR_INVALIDDATA;
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if (!memcmp("PCD_OPA", buf, 7)) {
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s->thumbnails = AV_RL16(buf + 10);
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av_log(avctx, AV_LOG_WARNING, "this is a thumbnails file, "
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"reading first thumbnail only\n");
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} else if (avpkt->size < 786432) {
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return AVERROR_INVALIDDATA;
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} else if (memcmp("PCD_IPI", buf + 0x800, 7)) {
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return AVERROR_INVALIDDATA;
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}
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s->orientation = s->thumbnails ? buf[12] & 3 : buf[0x48] & 3;
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if (s->thumbnails)
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s->resolution = 0;
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else if (avpkt->size <= 788480)
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s->resolution = 2;
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else
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s->resolution = av_clip(4 - s->lowres, 0, 4);
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avctx->width = img_info[s->resolution].width;
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avctx->height = img_info[s->resolution].height;
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if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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bytestream2_init(gb, avpkt->data, avpkt->size);
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if (s->resolution < 3) {
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ptr = p->data[0];
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ptr1 = p->data[1];
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ptr2 = p->data[2];
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if (s->thumbnails)
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bytestream2_seek(gb, 10240, SEEK_SET);
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else
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bytestream2_seek(gb, img_info[s->resolution].start, SEEK_SET);
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for (int y = 0; y < avctx->height; y += 2) {
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bytestream2_get_buffer(gb, ptr, avctx->width);
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ptr += p->linesize[0];
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bytestream2_get_buffer(gb, ptr, avctx->width);
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ptr += p->linesize[0];
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bytestream2_get_buffer(gb, ptr1, avctx->width >> 1);
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ptr1 += p->linesize[1];
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bytestream2_get_buffer(gb, ptr2, avctx->width >> 1);
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ptr2 += p->linesize[2];
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}
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} else {
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s->streampos = 0;
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ptr = p->data[0];
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ptr1 = p->data[1];
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ptr2 = p->data[2];
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interp_lowres(s, p, img_info[2].width, img_info[2].height);
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interp_lines(ptr1, p->linesize[1], img_info[2].width, img_info[2].height);
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interp_lines(ptr2, p->linesize[2], img_info[2].width, img_info[2].height);
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if (s->resolution == 4) {
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interp_pixels(ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
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interp_lines (ptr1, p->linesize[1], img_info[3].width, img_info[3].height);
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interp_pixels(ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
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interp_lines (ptr2, p->linesize[2], img_info[3].width, img_info[3].height);
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}
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interp_lines(ptr, p->linesize[0], img_info[3].width, img_info[3].height);
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s->streampos = 0xc2000;
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for (int n = 0; n < 3; n++) {
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if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
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return ret;
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}
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s->streampos = (s->streampos + 2047) & ~0x3ff;
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if (decode_huff(avctx, p, s->resolution, 3) < 0)
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return AVERROR_INVALIDDATA;
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if (s->resolution == 4) {
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interp_pixels(ptr, p->linesize[0], img_info[4].width, img_info[4].height);
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interp_lines (ptr, p->linesize[0], img_info[4].width, img_info[4].height);
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for (int n = 0; n < 3; n++) {
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if ((ret = read_hufftable(avctx, &s->vlc[n])) < 0)
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return ret;
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}
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s->streampos = (s->streampos + 2047) & ~0x3ff;
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if (decode_huff(avctx, p, 4, 4) < 0)
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return AVERROR_INVALIDDATA;
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}
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}
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{
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ptr1 = p->data[1];
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ptr2 = p->data[2];
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for (int y = 0; y < avctx->height >> 1; y++) {
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for (int x = 0; x < avctx->width >> 1; x++) {
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ptr1[x] = av_clip_uint8(ptr1[x] - 28);
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ptr2[x] = av_clip_uint8(ptr2[x] - 9);
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}
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ptr1 += p->linesize[1];
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ptr2 += p->linesize[2];
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}
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}
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*got_frame = 1;
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return 0;
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}
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static av_cold int photocd_decode_init(AVCodecContext *avctx)
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{
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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avctx->colorspace = AVCOL_SPC_BT709;
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avctx->color_primaries = AVCOL_PRI_BT709;
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avctx->color_trc = AVCOL_TRC_IEC61966_2_1;
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avctx->color_range = AVCOL_RANGE_JPEG;
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return 0;
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}
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static av_cold int photocd_decode_close(AVCodecContext *avctx)
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{
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PhotoCDContext *s = avctx->priv_data;
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for (int i = 0; i < 3; i++)
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ff_free_vlc(&s->vlc[i]);
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return 0;
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}
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#define OFFSET(x) offsetof(PhotoCDContext, x)
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#define VD AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_DECODING_PARAM
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static const AVOption options[] = {
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{ "lowres", "Lower the decoding resolution by a power of two",
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OFFSET(lowres), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 4, VD },
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{ NULL },
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};
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static const AVClass photocd_class = {
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.class_name = "photocd",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_photocd_decoder = {
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.name = "photocd",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_PHOTOCD,
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.priv_data_size = sizeof(PhotoCDContext),
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.priv_class = &photocd_class,
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.init = photocd_decode_init,
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.close = photocd_decode_close,
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.decode = photocd_decode_frame,
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.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
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.long_name = NULL_IF_CONFIG_SMALL("Kodak Photo CD"),
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};
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