356 lines
11 KiB
C
356 lines
11 KiB
C
/*
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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 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 St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Electronic Arts TGV Video Decoder
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* by Peter Ross (pross@xvid.org)
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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 BITSTREAM_READER_LE
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#include "get_bits.h"
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#include "internal.h"
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#include "libavutil/imgutils.h"
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#include "libavutil/mem.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 *last_frame;
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uint8_t *frame_buffer;
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int width,height;
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uint32_t palette[AVPALETTE_COUNT];
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int (*mv_codebook)[2];
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uint8_t (*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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{
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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 = AV_PIX_FMT_PAL8;
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s->last_frame = av_frame_alloc();
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if (!s->last_frame)
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return AVERROR(ENOMEM);
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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,
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uint8_t *dst, int width, int height)
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{
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uint8_t *dst_end = dst + width*height;
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int size, size1, size2, offset, run;
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uint8_t *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 AVERROR_INVALIDDATA;
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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, AVFrame *frame,
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const uint8_t *buf, const uint8_t *buf_end)
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{
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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 uint8_t *blocks_raw;
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if (buf + 12 > buf_end)
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return AVERROR_INVALIDDATA;
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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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if (vector_bits > MIN_CACHE_BITS || !vector_bits) {
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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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return AVERROR_INVALIDDATA;
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}
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/* allocate codebook buffers as necessary */
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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);
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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 AVERROR_INVALIDDATA;
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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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if (get_bits_left(&gb) < vector_bits *
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(s->avctx->height / 4) * (s->avctx->width / 4))
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return AVERROR_INVALIDDATA;
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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 uint8_t *src;
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int src_stride;
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if (vector < num_mvs) {
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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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if (mx < 0 || mx + 4 > s->avctx->width ||
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my < 0 || my + 4 > s->avctx->height)
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continue;
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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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} 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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frame->data[0][(y * 4 + j) * 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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static int tgv_decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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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 buf_size = avpkt->size;
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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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AVFrame *frame = data;
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int chunk_type, ret;
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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 AVERROR_INVALIDDATA;
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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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av_freep(&s->frame_buffer);
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av_frame_unref(s->last_frame);
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if ((ret = ff_set_dimensions(s->avctx, s->width, s->height)) < 0)
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return ret;
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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 ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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memcpy(frame->data[1], s->palette, AVPALETTE_SIZE);
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if (chunk_type == kVGT_TAG) {
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int y;
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frame->key_frame = 1;
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frame->pict_type = AV_PICTURE_TYPE_I;
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if (!s->frame_buffer &&
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!(s->frame_buffer = av_malloc(s->width * s->height)))
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return AVERROR(ENOMEM);
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if (unpack(buf, buf_end, s->frame_buffer, 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 AVERROR_INVALIDDATA;
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}
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for (y = 0; y < s->height; y++)
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memcpy(frame->data[0] + y * frame->linesize[0],
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s->frame_buffer + y * s->width,
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s->width);
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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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frame->key_frame = 0;
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frame->pict_type = AV_PICTURE_TYPE_P;
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if (tgv_decode_inter(s, frame, buf, buf_end) < 0) {
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av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n");
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return AVERROR_INVALIDDATA;
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}
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}
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av_frame_unref(s->last_frame);
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if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
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return ret;
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*got_frame = 1;
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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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av_frame_free(&s->last_frame);
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av_freep(&s->frame_buffer);
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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 ff_eatgv_decoder = {
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.name = "eatgv",
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.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_TGV,
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.priv_data_size = sizeof(TgvContext),
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.init = tgv_decode_init,
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.close = tgv_decode_end,
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.decode = tgv_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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