337 lines
10 KiB
C
337 lines
10 KiB
C
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/*
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* Delphine Software International CIN video decoder
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* Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
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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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* Delphine Software International CIN video decoder
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef enum CinVideoBitmapIndex {
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CIN_CUR_BMP = 0, /* current */
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CIN_PRE_BMP = 1, /* previous */
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CIN_INT_BMP = 2 /* intermediate */
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} CinVideoBitmapIndex;
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typedef struct CinVideoContext {
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AVCodecContext *avctx;
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AVFrame *frame;
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unsigned int bitmap_size;
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uint32_t palette[256];
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uint8_t *bitmap_table[3];
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} CinVideoContext;
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static av_cold void destroy_buffers(CinVideoContext *cin)
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{
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int i;
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for (i = 0; i < 3; ++i)
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av_freep(&cin->bitmap_table[i]);
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}
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static av_cold int allocate_buffers(CinVideoContext *cin)
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{
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int i;
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for (i = 0; i < 3; ++i) {
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cin->bitmap_table[i] = av_mallocz(cin->bitmap_size);
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if (!cin->bitmap_table[i]) {
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av_log(cin->avctx, AV_LOG_ERROR, "Can't allocate bitmap buffers.\n");
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destroy_buffers(cin);
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return AVERROR(ENOMEM);
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}
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}
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return 0;
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}
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static av_cold int cinvideo_decode_init(AVCodecContext *avctx)
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{
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CinVideoContext *cin = avctx->priv_data;
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cin->avctx = avctx;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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cin->frame = av_frame_alloc();
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if (!cin->frame)
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return AVERROR(ENOMEM);
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cin->bitmap_size = avctx->width * avctx->height;
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if (allocate_buffers(cin))
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return AVERROR(ENOMEM);
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return 0;
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}
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static void cin_apply_delta_data(const unsigned char *src, unsigned char *dst,
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int size)
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{
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while (size--)
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*dst++ += *src++;
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}
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static int cin_decode_huffman(const unsigned char *src, int src_size,
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unsigned char *dst, int dst_size)
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{
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int b, huff_code = 0;
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unsigned char huff_code_table[15];
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unsigned char *dst_cur = dst;
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unsigned char *dst_end = dst + dst_size;
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const unsigned char *src_end = src + src_size;
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memcpy(huff_code_table, src, 15);
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src += 15;
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while (src < src_end) {
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huff_code = *src++;
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if ((huff_code >> 4) == 15) {
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b = huff_code << 4;
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huff_code = *src++;
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*dst_cur++ = b | (huff_code >> 4);
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} else
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*dst_cur++ = huff_code_table[huff_code >> 4];
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if (dst_cur >= dst_end)
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break;
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huff_code &= 15;
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if (huff_code == 15) {
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*dst_cur++ = *src++;
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} else
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*dst_cur++ = huff_code_table[huff_code];
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if (dst_cur >= dst_end)
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break;
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}
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return dst_cur - dst;
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}
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static int cin_decode_lzss(const unsigned char *src, int src_size,
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unsigned char *dst, int dst_size)
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{
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uint16_t cmd;
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int i, sz, offset, code;
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unsigned char *dst_end = dst + dst_size, *dst_start = dst;
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const unsigned char *src_end = src + src_size;
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while (src < src_end && dst < dst_end) {
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code = *src++;
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for (i = 0; i < 8 && src < src_end && dst < dst_end; ++i) {
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if (code & (1 << i)) {
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*dst++ = *src++;
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} else {
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cmd = AV_RL16(src);
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src += 2;
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offset = cmd >> 4;
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if ((int)(dst - dst_start) < offset + 1)
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return AVERROR_INVALIDDATA;
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sz = (cmd & 0xF) + 2;
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/* don't use memcpy/memmove here as the decoding routine
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* (ab)uses buffer overlappings to repeat bytes in the
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* destination */
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sz = FFMIN(sz, dst_end - dst);
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while (sz--) {
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*dst = *(dst - offset - 1);
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++dst;
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}
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}
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}
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}
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if (dst_end - dst > dst_size - dst_size/10)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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static int cin_decode_rle(const unsigned char *src, int src_size,
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unsigned char *dst, int dst_size)
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{
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int len, code;
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unsigned char *dst_end = dst + dst_size;
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const unsigned char *src_end = src + src_size;
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while (src + 1 < src_end && dst < dst_end) {
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code = *src++;
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if (code & 0x80) {
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len = code - 0x7F;
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memset(dst, *src++, FFMIN(len, dst_end - dst));
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} else {
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len = code + 1;
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if (len > src_end-src) {
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av_log(NULL, AV_LOG_ERROR, "RLE overread\n");
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return AVERROR_INVALIDDATA;
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}
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memcpy(dst, src, FFMIN3(len, dst_end - dst, src_end - src));
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src += len;
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}
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dst += len;
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}
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if (dst_end - dst > dst_size - dst_size/10)
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return AVERROR_INVALIDDATA;
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return 0;
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}
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static int cinvideo_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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CinVideoContext *cin = avctx->priv_data;
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int i, y, palette_type, palette_colors_count,
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bitmap_frame_type, bitmap_frame_size, res = 0;
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palette_type = buf[0];
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palette_colors_count = AV_RL16(buf + 1);
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bitmap_frame_type = buf[3];
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buf += 4;
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bitmap_frame_size = buf_size - 4;
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/* handle palette */
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if (bitmap_frame_size < palette_colors_count * (3 + (palette_type != 0)))
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return AVERROR_INVALIDDATA;
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if (palette_type == 0) {
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if (palette_colors_count > 256)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < palette_colors_count; ++i) {
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cin->palette[i] = 0xFFU << 24 | bytestream_get_le24(&buf);
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bitmap_frame_size -= 3;
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}
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} else {
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for (i = 0; i < palette_colors_count; ++i) {
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cin->palette[buf[0]] = 0xFFU << 24 | AV_RL24(buf + 1);
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buf += 4;
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bitmap_frame_size -= 4;
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}
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}
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/* note: the decoding routines below assumes that
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* surface.width = surface.pitch */
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switch (bitmap_frame_type) {
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case 9:
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res = cin_decode_rle(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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if (res < 0)
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return res;
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break;
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case 34:
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res = cin_decode_rle(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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if (res < 0)
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return res;
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cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 35:
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bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_INT_BMP], cin->bitmap_size);
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res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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if (res < 0)
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return res;
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break;
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case 36:
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bitmap_frame_size = cin_decode_huffman(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_INT_BMP],
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cin->bitmap_size);
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res = cin_decode_rle(cin->bitmap_table[CIN_INT_BMP], bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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if (res < 0)
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return res;
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cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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case 37:
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res = cin_decode_huffman(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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if (cin->bitmap_size - avctx->discard_damaged_percentage*cin->bitmap_size/100 > res)
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return AVERROR_INVALIDDATA;
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break;
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case 38:
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res = cin_decode_lzss(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP],
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cin->bitmap_size);
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if (res < 0)
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return res;
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break;
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case 39:
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res = cin_decode_lzss(buf, bitmap_frame_size,
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cin->bitmap_table[CIN_CUR_BMP],
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cin->bitmap_size);
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if (res < 0)
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return res;
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cin_apply_delta_data(cin->bitmap_table[CIN_PRE_BMP],
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cin->bitmap_table[CIN_CUR_BMP], cin->bitmap_size);
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break;
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}
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if ((res = ff_reget_buffer(avctx, cin->frame, 0)) < 0)
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return res;
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memcpy(cin->frame->data[1], cin->palette, sizeof(cin->palette));
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cin->frame->palette_has_changed = 1;
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for (y = 0; y < cin->avctx->height; ++y)
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memcpy(cin->frame->data[0] + (cin->avctx->height - 1 - y) * cin->frame->linesize[0],
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cin->bitmap_table[CIN_CUR_BMP] + y * cin->avctx->width,
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cin->avctx->width);
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FFSWAP(uint8_t *, cin->bitmap_table[CIN_CUR_BMP],
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cin->bitmap_table[CIN_PRE_BMP]);
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if ((res = av_frame_ref(data, cin->frame)) < 0)
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return res;
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*got_frame = 1;
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return buf_size;
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}
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static av_cold int cinvideo_decode_end(AVCodecContext *avctx)
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{
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CinVideoContext *cin = avctx->priv_data;
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av_frame_free(&cin->frame);
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destroy_buffers(cin);
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return 0;
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}
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AVCodec ff_dsicinvideo_decoder = {
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.name = "dsicinvideo",
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.long_name = NULL_IF_CONFIG_SMALL("Delphine Software International CIN video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_DSICINVIDEO,
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.priv_data_size = sizeof(CinVideoContext),
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.init = cinvideo_decode_init,
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.close = cinvideo_decode_end,
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.decode = cinvideo_decode_frame,
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.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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