2003-10-01 06:39:38 +02:00
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/*
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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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2011-03-18 18:35:10 +01:00
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* This file is part of Libav.
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2006-10-07 17:30:46 +02:00
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*
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2011-03-18 18:35:10 +01:00
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* Libav is free software; you can redistribute it and/or
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2003-10-01 06:39:38 +02:00
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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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2006-10-07 17:30:46 +02:00
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* version 2.1 of the License, or (at your option) any later version.
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2003-10-01 06:39:38 +02:00
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*
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2011-03-18 18:35:10 +01:00
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* Libav is distributed in the hope that it will be useful,
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2003-10-01 06:39:38 +02:00
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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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2011-03-18 18:35:10 +01:00
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* License along with Libav; if not, write to the Free Software
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2006-01-12 23:43:26 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2003-10-01 06:39:38 +02:00
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*/
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/**
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2010-04-20 16:45:34 +02:00
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* @file
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2003-10-01 06:39:38 +02:00
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* Cinepak video decoder
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* by Ewald Snel <ewald@rambo.its.tudelft.nl>
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* For more information on the Cinepak algorithm, visit:
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* http://www.csse.monash.edu.au/~timf/
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2006-12-02 23:27:18 +01:00
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* 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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2003-10-01 06:39:38 +02:00
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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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2009-01-11 23:19:48 +01:00
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#include "libavutil/intreadwrite.h"
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2003-10-01 06:39:38 +02:00
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#include "avcodec.h"
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typedef struct {
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uint8_t y0, y1, y2, y3;
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uint8_t u, v;
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2008-12-14 04:29:33 +01:00
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} cvid_codebook;
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2003-10-01 06:39:38 +02:00
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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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2008-12-14 04:29:33 +01:00
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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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2003-10-01 06:39:38 +02:00
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typedef struct CinepakContext {
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AVCodecContext *avctx;
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AVFrame frame;
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2008-02-01 05:02:28 +01:00
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const unsigned char *data;
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2003-10-01 06:39:38 +02:00
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int size;
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2003-10-25 17:22:34 +02:00
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int width, height;
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2003-10-01 06:39:38 +02:00
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int palette_video;
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2008-12-14 04:29:33 +01:00
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cvid_strip strips[MAX_STRIPS];
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2003-10-01 06:39:38 +02:00
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2006-12-02 23:27:18 +01:00
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int sega_film_skip_bytes;
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2011-04-09 15:49:51 +02:00
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uint32_t pal[256];
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2003-10-01 06:39:38 +02:00
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} CinepakContext;
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2008-12-14 04:29:33 +01:00
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static void cinepak_decode_codebook (cvid_codebook *codebook,
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2008-02-01 05:02:28 +01:00
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int chunk_id, int size, const uint8_t *data)
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2003-10-01 06:39:38 +02:00
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{
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2008-02-01 05:02:28 +01:00
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const uint8_t *eod = (data + size);
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2003-10-01 06:39:38 +02:00
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uint32_t flag, mask;
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int i, n;
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/* check if this chunk contains 4- or 6-element vectors */
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2009-01-13 07:43:46 +01:00
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n = (chunk_id & 0x04) ? 4 : 6;
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2003-10-01 06:39:38 +02:00
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flag = 0;
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mask = 0;
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for (i=0; i < 256; i++) {
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2009-01-13 07:43:46 +01:00
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if ((chunk_id & 0x01) && !(mask >>= 1)) {
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2003-10-01 06:39:38 +02:00
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if ((data + 4) > eod)
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break;
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2007-01-19 23:12:59 +01:00
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flag = AV_RB32 (data);
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2003-10-01 06:39:38 +02:00
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data += 4;
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mask = 0x80000000;
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}
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2009-01-13 07:43:46 +01:00
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if (!(chunk_id & 0x01) || (flag & mask)) {
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2003-10-01 06:39:38 +02:00
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if ((data + n) > eod)
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break;
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if (n == 6) {
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codebook[i].y0 = *data++;
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codebook[i].y1 = *data++;
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codebook[i].y2 = *data++;
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codebook[i].y3 = *data++;
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codebook[i].u = 128 + *data++;
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codebook[i].v = 128 + *data++;
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} else {
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2005-12-17 19:14:38 +01:00
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/* this codebook type indicates either greyscale or
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2003-10-01 06:39:38 +02:00
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* palettized video; if palettized, U & V components will
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* not be used so it is safe to set them to 128 for the
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* benefit of greyscale rendering in YUV420P */
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codebook[i].y0 = *data++;
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codebook[i].y1 = *data++;
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codebook[i].y2 = *data++;
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codebook[i].y3 = *data++;
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codebook[i].u = 128;
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codebook[i].v = 128;
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}
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}
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}
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}
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2008-12-14 04:29:33 +01:00
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static int cinepak_decode_vectors (CinepakContext *s, cvid_strip *strip,
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2008-02-01 05:02:28 +01:00
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int chunk_id, int size, const uint8_t *data)
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2003-10-01 06:39:38 +02:00
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{
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2008-02-01 05:02:28 +01:00
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const uint8_t *eod = (data + size);
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2003-10-01 06:39:38 +02:00
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uint32_t flag, mask;
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2008-12-14 04:29:33 +01:00
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cvid_codebook *codebook;
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2004-05-07 23:34:33 +02:00
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unsigned int x, y;
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2003-10-01 06:39:38 +02:00
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uint32_t iy[4];
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uint32_t iu[2];
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uint32_t iv[2];
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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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iy[0] = strip->x1 + (y * s->frame.linesize[0]);
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iy[1] = iy[0] + s->frame.linesize[0];
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iy[2] = iy[1] + s->frame.linesize[0];
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iy[3] = iy[2] + s->frame.linesize[0];
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iu[0] = (strip->x1/2) + ((y/2) * s->frame.linesize[1]);
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iu[1] = iu[0] + s->frame.linesize[1];
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iv[0] = (strip->x1/2) + ((y/2) * s->frame.linesize[2]);
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iv[1] = iv[0] + s->frame.linesize[2];
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for (x=strip->x1; x < strip->x2; x+=4) {
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2009-01-13 07:43:46 +01:00
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if ((chunk_id & 0x01) && !(mask >>= 1)) {
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2003-10-01 06:39:38 +02:00
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if ((data + 4) > eod)
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return -1;
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2007-01-19 23:12:59 +01:00
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flag = AV_RB32 (data);
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2003-10-01 06:39:38 +02:00
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data += 4;
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mask = 0x80000000;
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}
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2009-01-13 07:43:46 +01:00
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if (!(chunk_id & 0x01) || (flag & mask)) {
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if (!(chunk_id & 0x02) && !(mask >>= 1)) {
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2003-10-01 06:39:38 +02:00
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if ((data + 4) > eod)
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return -1;
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2007-01-19 23:12:59 +01:00
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flag = AV_RB32 (data);
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2003-10-01 06:39:38 +02:00
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data += 4;
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mask = 0x80000000;
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}
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2009-01-13 07:43:46 +01:00
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if ((chunk_id & 0x02) || (~flag & mask)) {
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2003-10-01 06:39:38 +02:00
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if (data >= eod)
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return -1;
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codebook = &strip->v1_codebook[*data++];
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s->frame.data[0][iy[0] + 0] = codebook->y0;
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s->frame.data[0][iy[0] + 1] = codebook->y0;
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s->frame.data[0][iy[1] + 0] = codebook->y0;
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s->frame.data[0][iy[1] + 1] = codebook->y0;
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if (!s->palette_video) {
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s->frame.data[1][iu[0]] = codebook->u;
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s->frame.data[2][iv[0]] = codebook->v;
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}
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2004-06-20 21:13:07 +02:00
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s->frame.data[0][iy[0] + 2] = codebook->y1;
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s->frame.data[0][iy[0] + 3] = codebook->y1;
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s->frame.data[0][iy[1] + 2] = codebook->y1;
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s->frame.data[0][iy[1] + 3] = codebook->y1;
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2003-10-01 06:39:38 +02:00
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if (!s->palette_video) {
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s->frame.data[1][iu[0] + 1] = codebook->u;
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s->frame.data[2][iv[0] + 1] = codebook->v;
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}
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2004-06-20 21:13:07 +02:00
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s->frame.data[0][iy[2] + 0] = codebook->y2;
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s->frame.data[0][iy[2] + 1] = codebook->y2;
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s->frame.data[0][iy[3] + 0] = codebook->y2;
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s->frame.data[0][iy[3] + 1] = codebook->y2;
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2003-10-01 06:39:38 +02:00
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if (!s->palette_video) {
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s->frame.data[1][iu[1]] = codebook->u;
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s->frame.data[2][iv[1]] = codebook->v;
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}
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2004-06-20 21:13:07 +02:00
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s->frame.data[0][iy[2] + 2] = codebook->y3;
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s->frame.data[0][iy[2] + 3] = codebook->y3;
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s->frame.data[0][iy[3] + 2] = codebook->y3;
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s->frame.data[0][iy[3] + 3] = codebook->y3;
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2003-10-01 06:39:38 +02:00
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if (!s->palette_video) {
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s->frame.data[1][iu[1] + 1] = codebook->u;
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s->frame.data[2][iv[1] + 1] = codebook->v;
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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 -1;
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codebook = &strip->v4_codebook[*data++];
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s->frame.data[0][iy[0] + 0] = codebook->y0;
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s->frame.data[0][iy[0] + 1] = codebook->y1;
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s->frame.data[0][iy[1] + 0] = codebook->y2;
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s->frame.data[0][iy[1] + 1] = codebook->y3;
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if (!s->palette_video) {
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s->frame.data[1][iu[0]] = codebook->u;
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s->frame.data[2][iv[0]] = codebook->v;
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}
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codebook = &strip->v4_codebook[*data++];
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s->frame.data[0][iy[0] + 2] = codebook->y0;
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s->frame.data[0][iy[0] + 3] = codebook->y1;
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s->frame.data[0][iy[1] + 2] = codebook->y2;
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s->frame.data[0][iy[1] + 3] = codebook->y3;
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if (!s->palette_video) {
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s->frame.data[1][iu[0] + 1] = codebook->u;
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s->frame.data[2][iv[0] + 1] = codebook->v;
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}
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codebook = &strip->v4_codebook[*data++];
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s->frame.data[0][iy[2] + 0] = codebook->y0;
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s->frame.data[0][iy[2] + 1] = codebook->y1;
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s->frame.data[0][iy[3] + 0] = codebook->y2;
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s->frame.data[0][iy[3] + 1] = codebook->y3;
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if (!s->palette_video) {
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s->frame.data[1][iu[1]] = codebook->u;
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s->frame.data[2][iv[1]] = codebook->v;
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}
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codebook = &strip->v4_codebook[*data++];
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s->frame.data[0][iy[2] + 2] = codebook->y0;
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s->frame.data[0][iy[2] + 3] = codebook->y1;
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s->frame.data[0][iy[3] + 2] = codebook->y2;
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s->frame.data[0][iy[3] + 3] = codebook->y3;
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if (!s->palette_video) {
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s->frame.data[1][iu[1] + 1] = codebook->u;
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s->frame.data[2][iv[1] + 1] = codebook->v;
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}
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}
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}
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iy[0] += 4; iy[1] += 4;
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iy[2] += 4; iy[3] += 4;
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iu[0] += 2; iu[1] += 2;
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iv[0] += 2; iv[1] += 2;
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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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2008-12-14 04:29:33 +01:00
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cvid_strip *strip, const uint8_t *data, int size)
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2003-10-01 06:39:38 +02:00
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{
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2008-02-01 05:02:28 +01:00
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const uint8_t *eod = (data + size);
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2003-10-01 06:39:38 +02:00
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int chunk_id, chunk_size;
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/* coordinate sanity checks */
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2003-10-25 17:22:34 +02:00
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if (strip->x1 >= s->width || strip->x2 > s->width ||
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strip->y1 >= s->height || strip->y2 > s->height ||
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strip->x1 >= strip->x2 || strip->y1 >= strip->y2)
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2003-10-01 06:39:38 +02:00
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return -1;
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while ((data + 4) <= eod) {
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2009-01-13 07:43:46 +01:00
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chunk_id = data[0];
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chunk_size = AV_RB24 (&data[1]) - 4;
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2005-07-12 00:34:34 +02:00
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if(chunk_size < 0)
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return -1;
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2003-10-01 06:39:38 +02:00
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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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2009-01-13 07:43:46 +01:00
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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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2005-12-17 19:14:38 +01:00
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|
|
cinepak_decode_codebook (strip->v4_codebook, chunk_id,
|
2003-10-01 06:39:38 +02:00
|
|
|
chunk_size, data);
|
|
|
|
break;
|
|
|
|
|
2009-01-13 07:43:46 +01:00
|
|
|
case 0x22:
|
|
|
|
case 0x23:
|
|
|
|
case 0x26:
|
|
|
|
case 0x27:
|
2005-12-17 19:14:38 +01:00
|
|
|
cinepak_decode_codebook (strip->v1_codebook, chunk_id,
|
2003-10-01 06:39:38 +02:00
|
|
|
chunk_size, data);
|
|
|
|
break;
|
|
|
|
|
2009-01-13 07:43:46 +01:00
|
|
|
case 0x30:
|
|
|
|
case 0x31:
|
|
|
|
case 0x32:
|
2005-12-17 19:14:38 +01:00
|
|
|
return cinepak_decode_vectors (s, strip, chunk_id,
|
2003-10-01 06:39:38 +02:00
|
|
|
chunk_size, data);
|
|
|
|
}
|
|
|
|
|
|
|
|
data += chunk_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cinepak_decode (CinepakContext *s)
|
|
|
|
{
|
2008-02-01 05:02:28 +01:00
|
|
|
const uint8_t *eod = (s->data + s->size);
|
2003-10-01 06:39:38 +02:00
|
|
|
int i, result, strip_size, frame_flags, num_strips;
|
|
|
|
int y0 = 0;
|
2005-08-14 20:39:59 +02:00
|
|
|
int encoded_buf_size;
|
2003-10-01 06:39:38 +02:00
|
|
|
|
|
|
|
if (s->size < 10)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
frame_flags = s->data[0];
|
2007-01-19 23:12:59 +01:00
|
|
|
num_strips = AV_RB16 (&s->data[8]);
|
|
|
|
encoded_buf_size = ((s->data[1] << 16) | AV_RB16 (&s->data[2]));
|
2006-12-02 23:27:18 +01:00
|
|
|
|
|
|
|
/* if this is the first frame, check for deviant Sega FILM data */
|
|
|
|
if (s->sega_film_skip_bytes == -1) {
|
2011-11-16 08:06:48 +01:00
|
|
|
if (encoded_buf_size != s->size && (s->size % encoded_buf_size) != 0) {
|
2006-12-02 23:27:18 +01:00
|
|
|
/* If the encoded frame size differs from the frame size as indicated
|
|
|
|
* by the container file, this data likely comes from a Sega FILM/CPK file.
|
|
|
|
* If the frame header is followed by the bytes FE 00 00 06 00 00 then
|
|
|
|
* this is probably one of the two known files that have 6 extra bytes
|
2011-11-16 08:06:48 +01:00
|
|
|
* after the frame header. Else, assume 2 extra bytes. The container
|
|
|
|
* size also cannot be a multiple of the encoded size. */
|
2011-09-11 19:17:43 +02:00
|
|
|
if (s->size >= 16 &&
|
|
|
|
(s->data[10] == 0xFE) &&
|
2006-12-02 23:27:18 +01:00
|
|
|
(s->data[11] == 0x00) &&
|
|
|
|
(s->data[12] == 0x00) &&
|
|
|
|
(s->data[13] == 0x06) &&
|
|
|
|
(s->data[14] == 0x00) &&
|
|
|
|
(s->data[15] == 0x00))
|
|
|
|
s->sega_film_skip_bytes = 6;
|
|
|
|
else
|
|
|
|
s->sega_film_skip_bytes = 2;
|
|
|
|
} else
|
|
|
|
s->sega_film_skip_bytes = 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
s->data += 10 + s->sega_film_skip_bytes;
|
2003-10-01 06:39:38 +02:00
|
|
|
|
|
|
|
if (num_strips > MAX_STRIPS)
|
|
|
|
num_strips = MAX_STRIPS;
|
|
|
|
|
|
|
|
for (i=0; i < num_strips; i++) {
|
|
|
|
if ((s->data + 12) > eod)
|
|
|
|
return -1;
|
|
|
|
|
2009-01-13 09:00:37 +01:00
|
|
|
s->strips[i].id = s->data[0];
|
2003-10-01 06:39:38 +02:00
|
|
|
s->strips[i].y1 = y0;
|
|
|
|
s->strips[i].x1 = 0;
|
2007-01-19 23:12:59 +01:00
|
|
|
s->strips[i].y2 = y0 + AV_RB16 (&s->data[8]);
|
2003-10-01 06:39:38 +02:00
|
|
|
s->strips[i].x2 = s->avctx->width;
|
|
|
|
|
2009-01-13 07:43:46 +01:00
|
|
|
strip_size = AV_RB24 (&s->data[1]) - 12;
|
2003-10-01 06:39:38 +02:00
|
|
|
s->data += 12;
|
|
|
|
strip_size = ((s->data + strip_size) > eod) ? (eod - s->data) : strip_size;
|
|
|
|
|
|
|
|
if ((i > 0) && !(frame_flags & 0x01)) {
|
|
|
|
memcpy (s->strips[i].v4_codebook, s->strips[i-1].v4_codebook,
|
|
|
|
sizeof(s->strips[i].v4_codebook));
|
|
|
|
memcpy (s->strips[i].v1_codebook, s->strips[i-1].v1_codebook,
|
|
|
|
sizeof(s->strips[i].v1_codebook));
|
|
|
|
}
|
|
|
|
|
|
|
|
result = cinepak_decode_strip (s, &s->strips[i], s->data, strip_size);
|
|
|
|
|
|
|
|
if (result != 0)
|
|
|
|
return result;
|
|
|
|
|
|
|
|
s->data += strip_size;
|
|
|
|
y0 = s->strips[i].y2;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-03-21 04:11:20 +01:00
|
|
|
static av_cold int cinepak_decode_init(AVCodecContext *avctx)
|
2003-10-01 06:39:38 +02:00
|
|
|
{
|
2007-04-08 22:24:16 +02:00
|
|
|
CinepakContext *s = avctx->priv_data;
|
2003-10-01 06:39:38 +02:00
|
|
|
|
|
|
|
s->avctx = avctx;
|
2003-10-25 17:22:34 +02:00
|
|
|
s->width = (avctx->width + 3) & ~3;
|
|
|
|
s->height = (avctx->height + 3) & ~3;
|
2006-12-02 23:27:18 +01:00
|
|
|
s->sega_film_skip_bytes = -1; /* uninitialized state */
|
2003-10-01 06:39:38 +02:00
|
|
|
|
2004-06-27 16:46:02 +02:00
|
|
|
// check for paletted data
|
2011-04-09 15:49:51 +02:00
|
|
|
if (avctx->bits_per_coded_sample != 8) {
|
2004-06-27 16:46:02 +02:00
|
|
|
s->palette_video = 0;
|
|
|
|
avctx->pix_fmt = PIX_FMT_YUV420P;
|
|
|
|
} else {
|
|
|
|
s->palette_video = 1;
|
|
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
|
|
}
|
2003-10-01 06:39:38 +02:00
|
|
|
|
2004-05-07 23:34:33 +02:00
|
|
|
s->frame.data[0] = NULL;
|
2003-10-01 06:39:38 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cinepak_decode_frame(AVCodecContext *avctx,
|
|
|
|
void *data, int *data_size,
|
2009-04-07 17:59:50 +02:00
|
|
|
AVPacket *avpkt)
|
2003-10-01 06:39:38 +02:00
|
|
|
{
|
2009-04-07 17:59:50 +02:00
|
|
|
const uint8_t *buf = avpkt->data;
|
|
|
|
int buf_size = avpkt->size;
|
2007-04-08 22:24:16 +02:00
|
|
|
CinepakContext *s = avctx->priv_data;
|
2003-10-01 06:39:38 +02:00
|
|
|
|
|
|
|
s->data = buf;
|
|
|
|
s->size = buf_size;
|
|
|
|
|
2004-05-07 23:34:33 +02:00
|
|
|
s->frame.reference = 1;
|
|
|
|
s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE |
|
|
|
|
FF_BUFFER_HINTS_REUSABLE;
|
|
|
|
if (avctx->reget_buffer(avctx, &s->frame)) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
|
2003-10-01 06:39:38 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2004-06-27 16:46:02 +02:00
|
|
|
if (s->palette_video) {
|
2011-04-09 15:49:51 +02:00
|
|
|
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
|
|
|
|
if (pal) {
|
2004-06-27 16:46:02 +02:00
|
|
|
s->frame.palette_has_changed = 1;
|
2011-04-09 15:49:51 +02:00
|
|
|
memcpy(s->pal, pal, AVPALETTE_SIZE);
|
|
|
|
}
|
2004-06-27 16:46:02 +02:00
|
|
|
}
|
|
|
|
|
2011-04-09 15:49:51 +02:00
|
|
|
cinepak_decode(s);
|
|
|
|
|
|
|
|
if (s->palette_video)
|
|
|
|
memcpy (s->frame.data[1], s->pal, AVPALETTE_SIZE);
|
|
|
|
|
2003-10-01 06:39:38 +02:00
|
|
|
*data_size = sizeof(AVFrame);
|
|
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
|
|
|
|
/* report that the buffer was completely consumed */
|
|
|
|
return buf_size;
|
|
|
|
}
|
|
|
|
|
2008-03-21 04:11:20 +01:00
|
|
|
static av_cold int cinepak_decode_end(AVCodecContext *avctx)
|
2003-10-01 06:39:38 +02:00
|
|
|
{
|
2007-04-08 22:24:16 +02:00
|
|
|
CinepakContext *s = avctx->priv_data;
|
2003-10-01 06:39:38 +02:00
|
|
|
|
2004-05-07 23:34:33 +02:00
|
|
|
if (s->frame.data[0])
|
|
|
|
avctx->release_buffer(avctx, &s->frame);
|
2003-10-01 06:39:38 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-25 22:40:11 +01:00
|
|
|
AVCodec ff_cinepak_decoder = {
|
2011-07-17 12:54:31 +02:00
|
|
|
.name = "cinepak",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
|
|
.id = CODEC_ID_CINEPAK,
|
|
|
|
.priv_data_size = sizeof(CinepakContext),
|
|
|
|
.init = cinepak_decode_init,
|
|
|
|
.close = cinepak_decode_end,
|
|
|
|
.decode = cinepak_decode_frame,
|
|
|
|
.capabilities = CODEC_CAP_DR1,
|
2008-06-12 23:50:13 +02:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("Cinepak"),
|
2003-10-01 06:39:38 +02:00
|
|
|
};
|