2003-10-01 07:39:38 +03:00
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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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2006-10-07 18:30:46 +03:00
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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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2003-10-01 07:39:38 +03:00
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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 18:30:46 +03:00
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* version 2.1 of the License, or (at your option) any later version.
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2003-10-01 07:39:38 +03:00
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*
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2006-10-07 18:30:46 +03:00
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* FFmpeg is distributed in the hope that it will be useful,
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2003-10-01 07:39:38 +03:00
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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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2006-10-07 18:30:46 +03:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-13 00:43:26 +02:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2003-10-01 07:39:38 +03:00
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*
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*/
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/**
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* @file cinepak.c
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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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*/
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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 <unistd.h>
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#include "common.h"
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#include "avcodec.h"
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#include "dsputil.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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} cvid_codebook_t;
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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_t v4_codebook[256];
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cvid_codebook_t v1_codebook[256];
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} cvid_strip_t;
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typedef struct CinepakContext {
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AVCodecContext *avctx;
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DSPContext dsp;
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AVFrame frame;
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unsigned char *data;
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int size;
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2003-10-25 18:22:34 +03:00
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int width, height;
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2003-10-01 07:39:38 +03:00
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int palette_video;
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cvid_strip_t strips[MAX_STRIPS];
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} CinepakContext;
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static void cinepak_decode_codebook (cvid_codebook_t *codebook,
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int chunk_id, int size, uint8_t *data)
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{
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uint8_t *eod = (data + size);
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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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n = (chunk_id & 0x0400) ? 4 : 6;
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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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if ((chunk_id & 0x0100) && !(mask >>= 1)) {
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if ((data + 4) > eod)
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break;
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flag = BE_32 (data);
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data += 4;
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mask = 0x80000000;
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}
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if (!(chunk_id & 0x0100) || (flag & mask)) {
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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 20:14:38 +02:00
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/* this codebook type indicates either greyscale or
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2003-10-01 07:39:38 +03:00
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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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static int cinepak_decode_vectors (CinepakContext *s, cvid_strip_t *strip,
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int chunk_id, int size, uint8_t *data)
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{
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uint8_t *eod = (data + size);
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uint32_t flag, mask;
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cvid_codebook_t *codebook;
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2004-05-08 00:34:33 +03:00
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unsigned int x, y;
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2003-10-01 07:39:38 +03:00
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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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if ((chunk_id & 0x0100) && !(mask >>= 1)) {
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if ((data + 4) > eod)
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return -1;
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flag = BE_32 (data);
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data += 4;
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mask = 0x80000000;
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}
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if (!(chunk_id & 0x0100) || (flag & mask)) {
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if (!(chunk_id & 0x0200) && !(mask >>= 1)) {
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if ((data + 4) > eod)
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return -1;
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flag = BE_32 (data);
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data += 4;
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mask = 0x80000000;
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}
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if ((chunk_id & 0x0200) || (~flag & mask)) {
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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 22:13:07 +03:00
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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 07:39:38 +03:00
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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 22:13:07 +03:00
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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 07:39:38 +03:00
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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 22:13:07 +03:00
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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 07:39:38 +03:00
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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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cvid_strip_t *strip, uint8_t *data, int size)
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{
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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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2003-10-25 18:22:34 +03:00
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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 07:39:38 +03:00
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return -1;
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while ((data + 4) <= eod) {
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chunk_id = BE_16 (&data[0]);
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chunk_size = BE_16 (&data[2]) - 4;
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2005-07-12 01:34:34 +03:00
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if(chunk_size < 0)
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return -1;
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2003-10-01 07:39:38 +03:00
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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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case 0x2000:
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case 0x2100:
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case 0x2400:
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case 0x2500:
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2005-12-17 20:14:38 +02:00
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cinepak_decode_codebook (strip->v4_codebook, chunk_id,
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2003-10-01 07:39:38 +03:00
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chunk_size, data);
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break;
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case 0x2200:
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case 0x2300:
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case 0x2600:
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case 0x2700:
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2005-12-17 20:14:38 +02:00
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cinepak_decode_codebook (strip->v1_codebook, chunk_id,
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2003-10-01 07:39:38 +03:00
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chunk_size, data);
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break;
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case 0x3000:
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case 0x3100:
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case 0x3200:
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2005-12-17 20:14:38 +02:00
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return cinepak_decode_vectors (s, strip, chunk_id,
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2003-10-01 07:39:38 +03:00
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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 -1;
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}
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static int cinepak_decode (CinepakContext *s)
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{
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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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2005-08-14 21:39:59 +03:00
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int encoded_buf_size;
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/* if true, Cinepak data is from a Sega FILM/CPK file */
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int sega_film_data = 0;
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2003-10-01 07:39:38 +03:00
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if (s->size < 10)
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return -1;
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frame_flags = s->data[0];
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num_strips = BE_16 (&s->data[8]);
|
2005-12-14 02:19:01 +02:00
|
|
|
encoded_buf_size = ((s->data[1] << 16) | BE_16 (&s->data[2]));
|
2005-08-14 21:39:59 +03:00
|
|
|
if (encoded_buf_size != s->size)
|
|
|
|
sega_film_data = 1;
|
|
|
|
if (sega_film_data)
|
|
|
|
s->data += 12;
|
|
|
|
else
|
|
|
|
s->data += 10;
|
2003-10-01 07:39:38 +03:00
|
|
|
|
|
|
|
if (num_strips > MAX_STRIPS)
|
|
|
|
num_strips = MAX_STRIPS;
|
|
|
|
|
|
|
|
for (i=0; i < num_strips; i++) {
|
|
|
|
if ((s->data + 12) > eod)
|
|
|
|
return -1;
|
|
|
|
|
|
|
|
s->strips[i].id = BE_16 (s->data);
|
|
|
|
s->strips[i].y1 = y0;
|
|
|
|
s->strips[i].x1 = 0;
|
|
|
|
s->strips[i].y2 = y0 + BE_16 (&s->data[8]);
|
|
|
|
s->strips[i].x2 = s->avctx->width;
|
|
|
|
|
|
|
|
strip_size = BE_16 (&s->data[2]) - 12;
|
|
|
|
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;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cinepak_decode_init(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
CinepakContext *s = (CinepakContext *)avctx->priv_data;
|
|
|
|
|
|
|
|
s->avctx = avctx;
|
2003-10-25 18:22:34 +03:00
|
|
|
s->width = (avctx->width + 3) & ~3;
|
|
|
|
s->height = (avctx->height + 3) & ~3;
|
2003-10-01 07:39:38 +03:00
|
|
|
|
2004-06-27 17:46:02 +03:00
|
|
|
// check for paletted data
|
2004-06-27 19:06:15 +03:00
|
|
|
if ((avctx->palctrl == NULL) || (avctx->bits_per_sample == 40)) {
|
2004-06-27 17:46:02 +03:00
|
|
|
s->palette_video = 0;
|
|
|
|
avctx->pix_fmt = PIX_FMT_YUV420P;
|
|
|
|
} else {
|
|
|
|
s->palette_video = 1;
|
|
|
|
avctx->pix_fmt = PIX_FMT_PAL8;
|
|
|
|
}
|
2003-10-01 07:39:38 +03:00
|
|
|
|
|
|
|
avctx->has_b_frames = 0;
|
|
|
|
dsputil_init(&s->dsp, avctx);
|
|
|
|
|
2004-05-08 00:34:33 +03:00
|
|
|
s->frame.data[0] = NULL;
|
2003-10-01 07:39:38 +03:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cinepak_decode_frame(AVCodecContext *avctx,
|
|
|
|
void *data, int *data_size,
|
|
|
|
uint8_t *buf, int buf_size)
|
|
|
|
{
|
|
|
|
CinepakContext *s = (CinepakContext *)avctx->priv_data;
|
|
|
|
|
|
|
|
s->data = buf;
|
|
|
|
s->size = buf_size;
|
|
|
|
|
2004-05-08 00:34:33 +03:00
|
|
|
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 07:39:38 +03:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
cinepak_decode(s);
|
|
|
|
|
2004-06-27 17:46:02 +03:00
|
|
|
if (s->palette_video) {
|
|
|
|
memcpy (s->frame.data[1], avctx->palctrl->palette, AVPALETTE_SIZE);
|
|
|
|
if (avctx->palctrl->palette_changed) {
|
|
|
|
s->frame.palette_has_changed = 1;
|
|
|
|
avctx->palctrl->palette_changed = 0;
|
|
|
|
} else
|
|
|
|
s->frame.palette_has_changed = 0;
|
|
|
|
}
|
|
|
|
|
2003-10-01 07:39:38 +03:00
|
|
|
*data_size = sizeof(AVFrame);
|
|
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
|
|
|
|
/* report that the buffer was completely consumed */
|
|
|
|
return buf_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int cinepak_decode_end(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
CinepakContext *s = (CinepakContext *)avctx->priv_data;
|
|
|
|
|
2004-05-08 00:34:33 +03:00
|
|
|
if (s->frame.data[0])
|
|
|
|
avctx->release_buffer(avctx, &s->frame);
|
2003-10-01 07:39:38 +03:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
AVCodec cinepak_decoder = {
|
|
|
|
"cinepak",
|
|
|
|
CODEC_TYPE_VIDEO,
|
|
|
|
CODEC_ID_CINEPAK,
|
|
|
|
sizeof(CinepakContext),
|
|
|
|
cinepak_decode_init,
|
|
|
|
NULL,
|
|
|
|
cinepak_decode_end,
|
|
|
|
cinepak_decode_frame,
|
|
|
|
CODEC_CAP_DR1,
|
|
|
|
};
|