Electronic Arts TGV decoder
Originally committed as revision 14642 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Peter Ross
parent
6ba10f338a
commit
cfc78718f3
@ -128,6 +128,7 @@ version <next>
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- Motion Pixels MVI demuxer
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- removed animated GIF decoder/demuxer
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- D-Cinema audio muxer
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- Electronic Arts TGV decoder
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version 0.4.9-pre1:
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@ -229,6 +229,7 @@ following image formats are supported:
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@tab Codec originally used in Feeble Files game.
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@item Electronic Arts CMV @tab @tab X
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@tab Used in NHL 95 game.
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@item Electronic Arts TGV @tab @tab X
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@item FFmpeg Video 1 @tab X @tab X
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@tab experimental lossless codec (fourcc: FFV1)
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@item Flash Screen Video @tab X @tab X
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@ -62,6 +62,7 @@ OBJS-$(CONFIG_DVVIDEO_DECODER) += dv.o
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OBJS-$(CONFIG_DVVIDEO_ENCODER) += dv.o
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OBJS-$(CONFIG_DXA_DECODER) += dxa.o
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OBJS-$(CONFIG_EACMV_DECODER) += eacmv.o
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OBJS-$(CONFIG_EATGV_DECODER) += eatgv.o
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OBJS-$(CONFIG_EIGHTBPS_DECODER) += 8bps.o
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OBJS-$(CONFIG_EIGHTSVX_EXP_DECODER) += 8svx.o
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OBJS-$(CONFIG_EIGHTSVX_FIB_DECODER) += 8svx.o
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@ -79,6 +79,7 @@ void avcodec_register_all(void)
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REGISTER_ENCDEC (DVVIDEO, dvvideo);
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REGISTER_DECODER (DXA, dxa);
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REGISTER_DECODER (EACMV, eacmv);
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REGISTER_DECODER (EATGV, eatgv);
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REGISTER_DECODER (EIGHTBPS, eightbps);
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REGISTER_DECODER (EIGHTSVX_EXP, eightsvx_exp);
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REGISTER_DECODER (EIGHTSVX_FIB, eightsvx_fib);
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@ -30,7 +30,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVCODEC_VERSION_MAJOR 51
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#define LIBAVCODEC_VERSION_MINOR 62
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#define LIBAVCODEC_VERSION_MINOR 63
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#define LIBAVCODEC_VERSION_MICRO 0
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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@ -188,6 +188,7 @@ enum CodecID {
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CODEC_ID_BFI,
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CODEC_ID_CMV,
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CODEC_ID_MOTIONPIXELS,
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CODEC_ID_TGV,
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/* various PCM "codecs" */
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CODEC_ID_PCM_S16LE= 0x10000,
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340
libavcodec/eatgv.c
Normal file
340
libavcodec/eatgv.c
Normal file
@ -0,0 +1,340 @@
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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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* @file eatgv.c
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* Electronic Arts TGV Video Decoder
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* by Peter Ross (suxen_drol at hotmail dot com)
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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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#define ALT_BITSTREAM_READER_LE
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#include "bitstream.h"
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#include <libavutil/lzo.h>
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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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avctx->pix_fmt = PIX_FMT_PAL8;
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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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int size,size1,size2,offset,run;
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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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if (src+3>src_end)
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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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unsigned char *frame0_end = s->last_frame.data[0] + s->avctx->width*s->last_frame.linesize[0];
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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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if(buf+12>buf_end)
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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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/* allocate codebook buffers as neccessary */
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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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if (buf+(mvbits>>3)+16*num_blocks_raw+8*num_blocks_packed>buf_end)
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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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/* 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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src = s->last_frame.data[0] +
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(y*4 + s->mv_codebook[vector][1])*s->last_frame.linesize[0] +
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x*4 + s->mv_codebook[vector][0];
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src_stride = s->last_frame.linesize[0];
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if (src+3*src_stride+3>=frame0_end)
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continue;
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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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void *data, int *data_size,
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const uint8_t *buf, int buf_size)
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{
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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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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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if(buf+12>buf_end) {
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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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for(i=0; i<pal_count && i<AVPALETTE_COUNT && buf+2<buf_end; i++) {
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s->palette[i] = AV_RB24(buf);
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buf += 3;
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}
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}
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if (avcodec_check_dimensions(avctx, s->width, s->height))
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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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s->frame.reference = 1;
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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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/* allocate additional 12 bytes to accomodate av_memcpy_backptr() OUTBUF_PADDED optimisation */
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s->frame.data[0] = av_malloc(s->width*s->height + 12);
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if (!s->frame.data[0])
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return AVERROR_NOMEM;
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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]);
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return AVERROR_NOMEM;
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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;
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s->frame.pict_type = FF_I_TYPE;
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if (unpack(buf, buf_end, s->frame.data[0], s->avctx->width, s->avctx->height)<0) {
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av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n");
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return -1;
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}
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}else{
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if (!s->last_frame.data[0]) {
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av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n");
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return buf_size;
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}
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s->frame.key_frame = 0;
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s->frame.pict_type = FF_P_TYPE;
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if (tgv_decode_inter(s, buf, buf_end)<0) {
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av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
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return -1;
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}
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}
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*data_size = sizeof(AVFrame);
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*(AVFrame*)data = s->frame;
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return buf_size;
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}
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static av_cold int tgv_decode_end(AVCodecContext *avctx)
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{
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TgvContext *s = avctx->priv_data;
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cond_release_buffer(&s->frame);
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cond_release_buffer(&s->last_frame);
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av_free(s->mv_codebook);
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av_free(s->block_codebook);
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return 0;
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}
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AVCodec eatgv_decoder = {
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"eatgv",
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CODEC_TYPE_VIDEO,
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CODEC_ID_TGV,
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sizeof(TgvContext),
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tgv_decode_init,
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NULL,
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tgv_decode_end,
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tgv_decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGV Video"),
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};
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Block a user