2008-08-06 08:33:25 +00:00
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/*
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* Electronic Arts TGV Video Decoder
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* Copyright (c) 2007-2008 Peter Ross
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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2010-04-20 14:45:34 +00:00
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* @file
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2008-08-06 08:33:25 +00:00
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* Electronic Arts TGV Video Decoder
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2010-01-09 03:31:13 +00:00
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* by Peter Ross (pross@xvid.org)
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2008-08-06 08:33:25 +00:00
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*
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* Technical details here:
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* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGV
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*/
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#include "avcodec.h"
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2011-12-22 15:33:31 +00:00
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#define BITSTREAM_READER_LE
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2009-04-13 16:20:26 +00:00
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#include "get_bits.h"
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2011-02-07 13:37:08 +00:00
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#include "libavutil/imgutils.h"
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2012-10-18 17:27:51 +00:00
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#include "libavutil/mem.h"
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2008-08-06 08:33:25 +00:00
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#define EA_PREAMBLE_SIZE 8
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#define kVGT_TAG MKTAG('k', 'V', 'G', 'T')
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typedef struct TgvContext {
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AVCodecContext *avctx;
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AVFrame frame;
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AVFrame last_frame;
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int width,height;
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unsigned int palette[AVPALETTE_COUNT];
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int (*mv_codebook)[2];
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unsigned char (*block_codebook)[16];
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int num_mvs; ///< current length of mv_codebook
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int num_blocks_packed; ///< current length of block_codebook
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} TgvContext;
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static av_cold int tgv_decode_init(AVCodecContext *avctx){
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TgvContext *s = avctx->priv_data;
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s->avctx = avctx;
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avctx->time_base = (AVRational){1, 15};
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2012-10-06 10:10:34 +00:00
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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2011-05-02 00:15:15 +00:00
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avcodec_get_frame_defaults(&s->frame);
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avcodec_get_frame_defaults(&s->last_frame);
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2008-08-06 08:33:25 +00:00
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return 0;
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}
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/**
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* Unpack buffer
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* @return 0 on success, -1 on critical buffer underflow
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*/
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static int unpack(const uint8_t *src, const uint8_t *src_end, unsigned char *dst, int width, int height) {
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unsigned char *dst_end = dst + width*height;
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2012-02-13 07:24:00 +00:00
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int size, size1, size2, offset, run;
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2008-08-06 08:33:25 +00:00
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unsigned char *dst_start = dst;
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if (src[0] & 0x01)
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src += 5;
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else
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src += 2;
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2011-10-08 21:40:28 +00:00
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if (src_end - src < 3)
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2008-08-06 08:33:25 +00:00
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return -1;
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size = AV_RB24(src);
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src += 3;
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while(size>0 && src<src_end) {
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/* determine size1 and size2 */
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size1 = (src[0] & 3);
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if ( src[0] & 0x80 ) { // 1
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if (src[0] & 0x40 ) { // 11
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if ( src[0] & 0x20 ) { // 111
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if ( src[0] < 0xFC ) // !(111111)
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size1 = (((src[0] & 31) + 1) << 2);
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src++;
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size2 = 0;
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} else { // 110
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offset = ((src[0] & 0x10) << 12) + AV_RB16(&src[1]) + 1;
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size2 = ((src[0] & 0xC) << 6) + src[3] + 5;
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src += 4;
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}
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} else { // 10
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size1 = ( ( src[1] & 0xC0) >> 6 );
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offset = (AV_RB16(&src[1]) & 0x3FFF) + 1;
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size2 = (src[0] & 0x3F) + 4;
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src += 3;
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}
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} else { // 0
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offset = ((src[0] & 0x60) << 3) + src[1] + 1;
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size2 = ((src[0] & 0x1C) >> 2) + 3;
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src += 2;
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}
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/* fetch strip from src */
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if (size1>src_end-src)
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break;
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if (size1>0) {
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size -= size1;
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run = FFMIN(size1, dst_end-dst);
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memcpy(dst, src, run);
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dst += run;
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src += run;
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}
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if (size2>0) {
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if (dst-dst_start<offset)
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return 0;
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size -= size2;
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run = FFMIN(size2, dst_end-dst);
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av_memcpy_backptr(dst, offset, run);
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dst += run;
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}
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}
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return 0;
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}
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/**
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* Decode inter-frame
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* @return 0 on success, -1 on critical buffer underflow
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*/
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static int tgv_decode_inter(TgvContext * s, const uint8_t *buf, const uint8_t *buf_end){
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int num_mvs;
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int num_blocks_raw;
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int num_blocks_packed;
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int vector_bits;
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int i,j,x,y;
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GetBitContext gb;
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int mvbits;
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const unsigned char *blocks_raw;
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2011-10-08 21:40:28 +00:00
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if(buf_end - buf < 12)
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2008-08-06 08:33:25 +00:00
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return -1;
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num_mvs = AV_RL16(&buf[0]);
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num_blocks_raw = AV_RL16(&buf[2]);
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num_blocks_packed = AV_RL16(&buf[4]);
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vector_bits = AV_RL16(&buf[6]);
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buf += 12;
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2012-04-15 13:29:50 +00:00
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if (vector_bits > MIN_CACHE_BITS || !vector_bits) {
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2012-04-15 11:29:50 +00:00
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av_log(s->avctx, AV_LOG_ERROR,
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"Invalid value for motion vector bits: %d\n", vector_bits);
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2012-04-15 13:29:50 +00:00
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return AVERROR_INVALIDDATA;
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}
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2011-10-05 12:12:42 +00:00
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/* allocate codebook buffers as necessary */
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2008-08-06 08:33:25 +00:00
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if (num_mvs > s->num_mvs) {
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s->mv_codebook = av_realloc(s->mv_codebook, num_mvs*2*sizeof(int));
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s->num_mvs = num_mvs;
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}
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if (num_blocks_packed > s->num_blocks_packed) {
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s->block_codebook = av_realloc(s->block_codebook, num_blocks_packed*16*sizeof(unsigned char));
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s->num_blocks_packed = num_blocks_packed;
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}
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/* read motion vectors */
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mvbits = (num_mvs*2*10+31) & ~31;
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2011-10-08 21:40:28 +00:00
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if (buf_end - buf < (mvbits>>3)+16*num_blocks_raw+8*num_blocks_packed)
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2008-08-06 08:33:25 +00:00
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return -1;
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init_get_bits(&gb, buf, mvbits);
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for (i=0; i<num_mvs; i++) {
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s->mv_codebook[i][0] = get_sbits(&gb, 10);
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s->mv_codebook[i][1] = get_sbits(&gb, 10);
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}
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buf += mvbits>>3;
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/* note ptr to uncompressed blocks */
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blocks_raw = buf;
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buf += num_blocks_raw*16;
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/* read compressed blocks */
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init_get_bits(&gb, buf, (buf_end-buf)<<3);
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for (i=0; i<num_blocks_packed; i++) {
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int tmp[4];
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for(j=0; j<4; j++)
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tmp[j] = get_bits(&gb, 8);
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for(j=0; j<16; j++)
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s->block_codebook[i][15-j] = tmp[get_bits(&gb, 2)];
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}
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2010-02-26 18:12:27 +00:00
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if (get_bits_left(&gb) < vector_bits *
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(s->avctx->height/4) * (s->avctx->width/4))
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return -1;
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2008-08-06 08:33:25 +00:00
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/* read vectors and build frame */
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for(y=0; y<s->avctx->height/4; y++)
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for(x=0; x<s->avctx->width/4; x++) {
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unsigned int vector = get_bits(&gb, vector_bits);
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const unsigned char *src;
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int src_stride;
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if (vector < num_mvs) {
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2012-05-05 12:27:35 +00:00
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int mx = x * 4 + s->mv_codebook[vector][0];
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int my = y * 4 + s->mv_codebook[vector][1];
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2011-10-08 21:40:28 +00:00
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2012-05-05 12:27:35 +00:00
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if ( mx < 0 || mx + 4 > s->avctx->width
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2012-05-06 19:31:08 +00:00
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|| my < 0 || my + 4 > s->avctx->height) {
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av_log(s->avctx, AV_LOG_ERROR, "MV %d %d out of picture\n", mx, my);
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2008-08-06 08:33:25 +00:00
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continue;
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2012-05-06 19:31:08 +00:00
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}
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2012-05-05 12:27:35 +00:00
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src = s->last_frame.data[0] + mx + my * s->last_frame.linesize[0];
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src_stride = s->last_frame.linesize[0];
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2008-08-06 08:33:25 +00:00
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}else{
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int offset = vector - num_mvs;
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if (offset<num_blocks_raw)
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src = blocks_raw + 16*offset;
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else if (offset-num_blocks_raw<num_blocks_packed)
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src = s->block_codebook[offset-num_blocks_raw];
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else
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continue;
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src_stride = 4;
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}
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for(j=0; j<4; j++)
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for(i=0; i<4; i++)
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s->frame.data[0][ (y*4+j)*s->frame.linesize[0] + (x*4+i) ] =
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src[j*src_stride + i];
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}
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return 0;
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}
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/** release AVFrame buffers if allocated */
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static void cond_release_buffer(AVFrame *pic)
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{
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if (pic->data[0]) {
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av_freep(&pic->data[0]);
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av_free(pic->data[1]);
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}
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}
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static int tgv_decode_frame(AVCodecContext *avctx,
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2012-11-13 18:35:22 +00:00
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void *data, int *got_frame,
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2009-04-07 15:59:50 +00:00
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AVPacket *avpkt)
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2008-08-06 08:33:25 +00:00
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{
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2009-04-07 15:59:50 +00:00
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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2008-08-06 08:33:25 +00:00
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TgvContext *s = avctx->priv_data;
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const uint8_t *buf_end = buf + buf_size;
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int chunk_type;
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2011-10-08 21:40:28 +00:00
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if (buf_end - buf < EA_PREAMBLE_SIZE)
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return AVERROR_INVALIDDATA;
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2008-08-06 08:33:25 +00:00
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chunk_type = AV_RL32(&buf[0]);
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buf += EA_PREAMBLE_SIZE;
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if (chunk_type==kVGT_TAG) {
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int pal_count, i;
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2011-10-08 21:40:28 +00:00
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if(buf_end - buf < 12) {
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2008-08-06 08:33:25 +00:00
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av_log(avctx, AV_LOG_WARNING, "truncated header\n");
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return -1;
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}
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s->width = AV_RL16(&buf[0]);
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s->height = AV_RL16(&buf[2]);
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if (s->avctx->width!=s->width || s->avctx->height!=s->height) {
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avcodec_set_dimensions(s->avctx, s->width, s->height);
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cond_release_buffer(&s->frame);
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cond_release_buffer(&s->last_frame);
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}
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pal_count = AV_RL16(&buf[6]);
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buf += 12;
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2011-10-08 21:40:28 +00:00
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for(i=0; i<pal_count && i<AVPALETTE_COUNT && buf_end - buf >= 3; i++) {
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2012-10-14 01:17:13 +00:00
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s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
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2008-08-06 08:33:25 +00:00
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buf += 3;
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}
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}
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2010-09-07 19:15:29 +00:00
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if (av_image_check_size(s->width, s->height, 0, avctx))
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2008-08-06 08:33:25 +00:00
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return -1;
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/* shuffle */
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FFSWAP(AVFrame, s->frame, s->last_frame);
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if (!s->frame.data[0]) {
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2011-11-05 18:48:39 +00:00
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s->frame.reference = 3;
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2008-08-06 08:33:25 +00:00
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID;
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s->frame.linesize[0] = s->width;
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2012-10-23 17:22:52 +00:00
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s->frame.data[0] = av_malloc(s->width * s->height);
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2008-08-06 08:33:25 +00:00
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if (!s->frame.data[0])
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2010-04-03 14:15:00 +00:00
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return AVERROR(ENOMEM);
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2008-08-06 08:33:25 +00:00
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s->frame.data[1] = av_malloc(AVPALETTE_SIZE);
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if (!s->frame.data[1]) {
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av_freep(&s->frame.data[0]);
|
2010-04-03 14:15:00 +00:00
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return AVERROR(ENOMEM);
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2008-08-06 08:33:25 +00:00
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}
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}
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memcpy(s->frame.data[1], s->palette, AVPALETTE_SIZE);
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if(chunk_type==kVGT_TAG) {
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s->frame.key_frame = 1;
|
2011-04-27 23:40:44 +00:00
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s->frame.pict_type = AV_PICTURE_TYPE_I;
|
2008-08-06 08:33:25 +00:00
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if (unpack(buf, buf_end, s->frame.data[0], s->avctx->width, s->avctx->height)<0) {
|
|
|
|
av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}else{
|
|
|
|
if (!s->last_frame.data[0]) {
|
|
|
|
av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n");
|
|
|
|
return buf_size;
|
|
|
|
}
|
|
|
|
s->frame.key_frame = 0;
|
2011-04-27 23:40:44 +00:00
|
|
|
s->frame.pict_type = AV_PICTURE_TYPE_P;
|
2008-08-06 08:33:25 +00:00
|
|
|
if (tgv_decode_inter(s, buf, buf_end)<0) {
|
|
|
|
av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-11-13 18:35:22 +00:00
|
|
|
*got_frame = 1;
|
2008-08-06 08:33:25 +00:00
|
|
|
*(AVFrame*)data = s->frame;
|
|
|
|
|
|
|
|
return buf_size;
|
|
|
|
}
|
|
|
|
|
|
|
|
static av_cold int tgv_decode_end(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
TgvContext *s = avctx->priv_data;
|
|
|
|
cond_release_buffer(&s->frame);
|
|
|
|
cond_release_buffer(&s->last_frame);
|
|
|
|
av_free(s->mv_codebook);
|
|
|
|
av_free(s->block_codebook);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-25 21:40:11 +00:00
|
|
|
AVCodec ff_eatgv_decoder = {
|
2011-07-17 10:54:31 +00:00
|
|
|
.name = "eatgv",
|
|
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
2012-08-05 09:11:04 +00:00
|
|
|
.id = AV_CODEC_ID_TGV,
|
2011-07-17 10:54:31 +00:00
|
|
|
.priv_data_size = sizeof(TgvContext),
|
|
|
|
.init = tgv_decode_init,
|
|
|
|
.close = tgv_decode_end,
|
|
|
|
.decode = tgv_decode_frame,
|
2012-04-06 16:19:39 +00:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
|
2008-08-06 08:33:25 +00:00
|
|
|
};
|