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479 lines
16 KiB
479 lines
16 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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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/** |
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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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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "libavutil/intreadwrite.h" |
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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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} cvid_codebook; |
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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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/* 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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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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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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/* this codebook type indicates either greyscale or |
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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 *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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cvid_codebook *codebook; |
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unsigned int x, y; |
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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 & 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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if (data >= eod) |
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return AVERROR_INVALIDDATA; |
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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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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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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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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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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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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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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 AVERROR_INVALIDDATA; |
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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 *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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av_log_ask_for_sample(s->avctx, "encoded_buf_size is 0"); |
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return AVERROR_INVALIDDATA; |
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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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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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s->strips[i].y1 = y0; |
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s->strips[i].x1 = 0; |
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s->strips[i].y2 = y0 + AV_RB16 (&s->data[8]); |
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s->strips[i].x2 = s->avctx->width; |
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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 = PIX_FMT_YUV420P; |
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} else { |
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s->palette_video = 1; |
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avctx->pix_fmt = PIX_FMT_PAL8; |
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} |
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s->frame.data[0] = NULL; |
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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 *data_size, |
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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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s->frame.reference = 1; |
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | |
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FF_BUFFER_HINTS_REUSABLE; |
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if ((ret = avctx->reget_buffer(avctx, &s->frame))) { |
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n"); |
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return ret; |
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} |
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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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cinepak_decode(s); |
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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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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = s->frame; |
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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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if (s->frame.data[0]) |
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avctx->release_buffer(avctx, &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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.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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.long_name = NULL_IF_CONFIG_SMALL("Cinepak"), |
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};
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