489 lines
15 KiB
C
489 lines
15 KiB
C
/*
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* Cinepak Video Decoder
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* Copyright (C) 2003 the ffmpeg project
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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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* Cinepak video decoder
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* @author Ewald Snel <ewald@rambo.its.tudelft.nl>
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*
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* @see For more information on the Cinepak algorithm, visit:
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* http://www.csse.monash.edu.au/~timf/
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* @see For more information on the quirky data inside Sega FILM/CPK files, visit:
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* http://wiki.multimedia.cx/index.php?title=Sega_FILM
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*
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* Cinepak colorspace support (c) 2013 Rl, Aetey Global Technologies AB
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* @author Cinepak colorspace, Rl, Aetey Global Technologies AB
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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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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "avcodec.h"
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#include "internal.h"
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typedef uint8_t cvid_codebook[12];
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#define MAX_STRIPS 32
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typedef struct {
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uint16_t id;
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uint16_t x1, y1;
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uint16_t x2, y2;
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cvid_codebook v4_codebook[256];
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cvid_codebook v1_codebook[256];
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} cvid_strip;
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typedef struct CinepakContext {
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AVCodecContext *avctx;
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AVFrame *frame;
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const unsigned char *data;
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int size;
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int width, height;
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int palette_video;
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cvid_strip strips[MAX_STRIPS];
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int sega_film_skip_bytes;
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uint32_t pal[256];
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} CinepakContext;
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static void cinepak_decode_codebook (cvid_codebook *codebook,
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int chunk_id, int size, const uint8_t *data)
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{
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const uint8_t *eod = (data + size);
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uint32_t flag, mask;
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int i, n;
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uint8_t *p;
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/* check if this chunk contains 4- or 6-element vectors */
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n = (chunk_id & 0x04) ? 4 : 6;
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flag = 0;
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mask = 0;
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p = codebook[0];
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for (i=0; i < 256; i++) {
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if ((chunk_id & 0x01) && !(mask >>= 1)) {
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if ((data + 4) > eod)
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break;
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flag = AV_RB32 (data);
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data += 4;
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mask = 0x80000000;
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}
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if (!(chunk_id & 0x01) || (flag & mask)) {
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int k, kk;
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if ((data + n) > eod)
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break;
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for (k = 0; k < 4; ++k) {
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int r = *data++;
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for (kk = 0; kk < 3; ++kk)
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*p++ = r;
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}
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if (n == 6) {
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int r, g, b, u, v;
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u = *(int8_t *)data++;
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v = *(int8_t *)data++;
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p -= 12;
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for(k=0; k<4; ++k) {
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r = *p++ + v*2;
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g = *p++ - (u/2) - v;
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b = *p + u*2;
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p -= 2;
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*p++ = av_clip_uint8(r);
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*p++ = av_clip_uint8(g);
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*p++ = av_clip_uint8(b);
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}
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}
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} else {
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p += 12;
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}
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}
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}
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static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
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int chunk_id, int size, const uint8_t *data)
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{
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const uint8_t *eod = (data + size);
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uint32_t flag, mask;
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uint8_t *cb0, *cb1, *cb2, *cb3;
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unsigned int x, y;
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char *ip0, *ip1, *ip2, *ip3;
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flag = 0;
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mask = 0;
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for (y=strip->y1; y < strip->y2; y+=4) {
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/* take care of y dimension not being multiple of 4, such streams exist */
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ip0 = ip1 = ip2 = ip3 = s->frame->data[0] +
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(s->palette_video?strip->x1:strip->x1*3) + (y * s->frame->linesize[0]);
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if(s->avctx->height - y > 1) {
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ip1 = ip0 + s->frame->linesize[0];
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if(s->avctx->height - y > 2) {
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ip2 = ip1 + s->frame->linesize[0];
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if(s->avctx->height - y > 3) {
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ip3 = ip2 + s->frame->linesize[0];
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}
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}
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}
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/* to get the correct picture for not-multiple-of-4 cases let us fill
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* each block from the bottom up, thus possibly overwriting the top line
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* more than once but ending with the correct data in place
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* (instead of in-loop checking) */
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for (x=strip->x1; x < strip->x2; x+=4) {
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if ((chunk_id & 0x01) && !(mask >>= 1)) {
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if ((data + 4) > eod)
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return AVERROR_INVALIDDATA;
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flag = AV_RB32 (data);
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data += 4;
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mask = 0x80000000;
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}
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if (!(chunk_id & 0x01) || (flag & mask)) {
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if (!(chunk_id & 0x02) && !(mask >>= 1)) {
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if ((data + 4) > eod)
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return AVERROR_INVALIDDATA;
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flag = AV_RB32 (data);
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data += 4;
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mask = 0x80000000;
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}
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if ((chunk_id & 0x02) || (~flag & mask)) {
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uint8_t *p;
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if (data >= eod)
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return AVERROR_INVALIDDATA;
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p = strip->v1_codebook[*data++];
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if (s->palette_video) {
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ip3[0] = ip3[1] = ip2[0] = ip2[1] = p[6];
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ip3[2] = ip3[3] = ip2[2] = ip2[3] = p[9];
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ip1[0] = ip1[1] = ip0[0] = ip0[1] = p[0];
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ip1[2] = ip1[3] = ip0[2] = ip0[3] = p[3];
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} else {
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p += 6;
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memcpy(ip3 + 0, p, 3); memcpy(ip3 + 3, p, 3);
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memcpy(ip2 + 0, p, 3); memcpy(ip2 + 3, p, 3);
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p += 3; /* ... + 9 */
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memcpy(ip3 + 6, p, 3); memcpy(ip3 + 9, p, 3);
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memcpy(ip2 + 6, p, 3); memcpy(ip2 + 9, p, 3);
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p -= 9; /* ... + 0 */
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memcpy(ip1 + 0, p, 3); memcpy(ip1 + 3, p, 3);
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memcpy(ip0 + 0, p, 3); memcpy(ip0 + 3, p, 3);
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p += 3; /* ... + 3 */
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memcpy(ip1 + 6, p, 3); memcpy(ip1 + 9, p, 3);
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memcpy(ip0 + 6, p, 3); memcpy(ip0 + 9, p, 3);
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}
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} else if (flag & mask) {
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if ((data + 4) > eod)
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return AVERROR_INVALIDDATA;
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cb0 = strip->v4_codebook[*data++];
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cb1 = strip->v4_codebook[*data++];
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cb2 = strip->v4_codebook[*data++];
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cb3 = strip->v4_codebook[*data++];
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if (s->palette_video) {
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uint8_t *p;
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p = ip3;
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*p++ = cb2[6];
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*p++ = cb2[9];
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*p++ = cb3[6];
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*p = cb3[9];
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p = ip2;
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*p++ = cb2[0];
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*p++ = cb2[3];
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*p++ = cb3[0];
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*p = cb3[3];
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p = ip1;
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*p++ = cb0[6];
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*p++ = cb0[9];
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*p++ = cb1[6];
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*p = cb1[9];
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p = ip0;
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*p++ = cb0[0];
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*p++ = cb0[3];
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*p++ = cb1[0];
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*p = cb1[3];
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} else {
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memcpy(ip3 + 0, cb2 + 6, 6);
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memcpy(ip3 + 6, cb3 + 6, 6);
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memcpy(ip2 + 0, cb2 + 0, 6);
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memcpy(ip2 + 6, cb3 + 0, 6);
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memcpy(ip1 + 0, cb0 + 6, 6);
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memcpy(ip1 + 6, cb1 + 6, 6);
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memcpy(ip0 + 0, cb0 + 0, 6);
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memcpy(ip0 + 6, cb1 + 0, 6);
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}
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}
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}
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if (s->palette_video) {
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ip0 += 4; ip1 += 4;
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ip2 += 4; ip3 += 4;
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} else {
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ip0 += 12; ip1 += 12;
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ip2 += 12; ip3 += 12;
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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 cinepak_decode_strip (CinepakContext *s,
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cvid_strip *strip, const uint8_t *data, int size)
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{
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const uint8_t *eod = (data + size);
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int chunk_id, chunk_size;
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/* coordinate sanity checks */
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if (strip->x2 > s->width ||
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strip->y2 > s->height ||
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strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
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return AVERROR_INVALIDDATA;
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while ((data + 4) <= eod) {
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chunk_id = data[0];
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chunk_size = AV_RB24 (&data[1]) - 4;
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if(chunk_size < 0)
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return AVERROR_INVALIDDATA;
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data += 4;
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chunk_size = ((data + chunk_size) > eod) ? (eod - data) : chunk_size;
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switch (chunk_id) {
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case 0x20:
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case 0x21:
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case 0x24:
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case 0x25:
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cinepak_decode_codebook (strip->v4_codebook, chunk_id,
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chunk_size, data);
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break;
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case 0x22:
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case 0x23:
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case 0x26:
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case 0x27:
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cinepak_decode_codebook (strip->v1_codebook, chunk_id,
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chunk_size, data);
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break;
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case 0x30:
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case 0x31:
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case 0x32:
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return cinepak_decode_vectors (s, strip, chunk_id,
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chunk_size, data);
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}
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data += chunk_size;
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}
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return AVERROR_INVALIDDATA;
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}
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static int cinepak_decode (CinepakContext *s)
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{
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const uint8_t *eod = (s->data + s->size);
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int i, result, strip_size, frame_flags, num_strips;
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int y0 = 0;
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int encoded_buf_size;
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if (s->size < 10)
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return AVERROR_INVALIDDATA;
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frame_flags = s->data[0];
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num_strips = AV_RB16 (&s->data[8]);
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encoded_buf_size = AV_RB24(&s->data[1]);
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/* if this is the first frame, check for deviant Sega FILM data */
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if (s->sega_film_skip_bytes == -1) {
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if (!encoded_buf_size) {
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avpriv_request_sample(s->avctx, "encoded_buf_size 0");
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return AVERROR_PATCHWELCOME;
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}
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if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
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/* If the encoded frame size differs from the frame size as indicated
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* by the container file, this data likely comes from a Sega FILM/CPK file.
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* If the frame header is followed by the bytes FE 00 00 06 00 00 then
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* this is probably one of the two known files that have 6 extra bytes
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* after the frame header. Else, assume 2 extra bytes. The container
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* size also cannot be a multiple of the encoded size. */
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if (s->size >= 16 &&
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(s->data[10] == 0xFE) &&
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(s->data[11] == 0x00) &&
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(s->data[12] == 0x00) &&
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(s->data[13] == 0x06) &&
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(s->data[14] == 0x00) &&
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(s->data[15] == 0x00))
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s->sega_film_skip_bytes = 6;
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else
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s->sega_film_skip_bytes = 2;
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} else
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s->sega_film_skip_bytes = 0;
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}
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s->data += 10 + s->sega_film_skip_bytes;
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num_strips = FFMIN(num_strips, MAX_STRIPS);
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s->frame->key_frame = 0;
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for (i=0; i < num_strips; i++) {
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if ((s->data + 12) > eod)
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return AVERROR_INVALIDDATA;
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s->strips[i].id = s->data[0];
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/* zero y1 means "relative to the previous stripe" */
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if (!(s->strips[i].y1 = AV_RB16 (&s->data[4])))
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s->strips[i].y2 = (s->strips[i].y1 = y0) + AV_RB16 (&s->data[8]);
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else
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s->strips[i].y2 = AV_RB16 (&s->data[8]);
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s->strips[i].x1 = AV_RB16 (&s->data[6]);
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s->strips[i].x2 = AV_RB16 (&s->data[10]);
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if (s->strips[i].id == 0x10)
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s->frame->key_frame = 1;
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strip_size = AV_RB24 (&s->data[1]) - 12;
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if (strip_size < 0)
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return AVERROR_INVALIDDATA;
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s->data += 12;
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strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
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if ((i > 0) && !(frame_flags & 0x01)) {
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memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
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sizeof(s->strips[i].v4_codebook));
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memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
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sizeof(s->strips[i].v1_codebook));
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}
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result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
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if (result != 0)
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return result;
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s->data += strip_size;
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y0 = s->strips[i].y2;
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}
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return 0;
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}
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static av_cold int cinepak_decode_init(AVCodecContext *avctx)
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{
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CinepakContext *s = avctx->priv_data;
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s->avctx = avctx;
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s->width = (avctx->width + 3) & ~3;
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s->height = (avctx->height + 3) & ~3;
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s->sega_film_skip_bytes = -1; /* uninitialized state */
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// check for paletted data
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if (avctx->bits_per_coded_sample != 8) {
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s->palette_video = 0;
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avctx->pix_fmt = AV_PIX_FMT_RGB24;
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} else {
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s->palette_video = 1;
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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}
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s->frame = av_frame_alloc();
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if (!s->frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static int cinepak_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 ret = 0, buf_size = avpkt->size;
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CinepakContext *s = avctx->priv_data;
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s->data = buf;
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s->size = buf_size;
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if ((ret = ff_reget_buffer(avctx, s->frame)) < 0)
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return ret;
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if (s->palette_video) {
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const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
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if (pal) {
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s->frame->palette_has_changed = 1;
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memcpy(s->pal, pal, AVPALETTE_SIZE);
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}
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}
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if ((ret = cinepak_decode(s)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "cinepak_decode failed\n");
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}
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if (s->palette_video)
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memcpy (s->frame->data[1], s->pal, AVPALETTE_SIZE);
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if ((ret = av_frame_ref(data, s->frame)) < 0)
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return ret;
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*got_frame = 1;
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/* report that the buffer was completely consumed */
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return buf_size;
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}
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static av_cold int cinepak_decode_end(AVCodecContext *avctx)
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{
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CinepakContext *s = avctx->priv_data;
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av_frame_free(&s->frame);
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return 0;
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}
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AVCodec ff_cinepak_decoder = {
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.name = "cinepak",
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.long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_CINEPAK,
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.priv_data_size = sizeof(CinepakContext),
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.init = cinepak_decode_init,
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.close = cinepak_decode_end,
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.decode = cinepak_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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