0,0 → 1,364 |
/* |
* Electronic Arts TGV Video Decoder |
* Copyright (c) 2007-2008 Peter Ross |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
/** |
* @file |
* Electronic Arts TGV Video Decoder |
* by Peter Ross (pross@xvid.org) |
* |
* Technical details here: |
* http://wiki.multimedia.cx/index.php?title=Electronic_Arts_TGV |
*/ |
|
#include "avcodec.h" |
#define BITSTREAM_READER_LE |
#include "get_bits.h" |
#include "internal.h" |
#include "libavutil/imgutils.h" |
#include "libavutil/mem.h" |
|
#define EA_PREAMBLE_SIZE 8 |
#define kVGT_TAG MKTAG('k', 'V', 'G', 'T') |
|
typedef struct TgvContext { |
AVCodecContext *avctx; |
AVFrame last_frame; |
uint8_t *frame_buffer; |
int width,height; |
uint32_t palette[AVPALETTE_COUNT]; |
|
int (*mv_codebook)[2]; |
uint8_t (*block_codebook)[16]; |
int num_mvs; ///< current length of mv_codebook |
int num_blocks_packed; ///< current length of block_codebook |
} TgvContext; |
|
static av_cold int tgv_decode_init(AVCodecContext *avctx) |
{ |
TgvContext *s = avctx->priv_data; |
s->avctx = avctx; |
avctx->time_base = (AVRational){1, 15}; |
avctx->pix_fmt = AV_PIX_FMT_PAL8; |
avcodec_get_frame_defaults(&s->last_frame); |
return 0; |
} |
|
/** |
* Unpack buffer |
* @return 0 on success, -1 on critical buffer underflow |
*/ |
static int unpack(const uint8_t *src, const uint8_t *src_end, |
uint8_t *dst, int width, int height) |
{ |
uint8_t *dst_end = dst + width*height; |
int size, size1, size2, offset, run; |
uint8_t *dst_start = dst; |
|
if (src[0] & 0x01) |
src += 5; |
else |
src += 2; |
|
if (src_end - src < 3) |
return AVERROR_INVALIDDATA; |
size = AV_RB24(src); |
src += 3; |
|
while (size > 0 && src < src_end) { |
|
/* determine size1 and size2 */ |
size1 = (src[0] & 3); |
if (src[0] & 0x80) { // 1 |
if (src[0] & 0x40 ) { // 11 |
if (src[0] & 0x20) { // 111 |
if (src[0] < 0xFC) // !(111111) |
size1 = (((src[0] & 31) + 1) << 2); |
src++; |
size2 = 0; |
} else { // 110 |
offset = ((src[0] & 0x10) << 12) + AV_RB16(&src[1]) + 1; |
size2 = ((src[0] & 0xC) << 6) + src[3] + 5; |
src += 4; |
} |
} else { // 10 |
size1 = ((src[1] & 0xC0) >> 6); |
offset = (AV_RB16(&src[1]) & 0x3FFF) + 1; |
size2 = (src[0] & 0x3F) + 4; |
src += 3; |
} |
} else { // 0 |
offset = ((src[0] & 0x60) << 3) + src[1] + 1; |
size2 = ((src[0] & 0x1C) >> 2) + 3; |
src += 2; |
} |
|
|
/* fetch strip from src */ |
if (size1 > src_end - src) |
break; |
|
if (size1 > 0) { |
size -= size1; |
run = FFMIN(size1, dst_end - dst); |
memcpy(dst, src, run); |
dst += run; |
src += run; |
} |
|
if (size2 > 0) { |
if (dst - dst_start < offset) |
return 0; |
size -= size2; |
run = FFMIN(size2, dst_end - dst); |
av_memcpy_backptr(dst, offset, run); |
dst += run; |
} |
} |
|
return 0; |
} |
|
/** |
* Decode inter-frame |
* @return 0 on success, -1 on critical buffer underflow |
*/ |
static int tgv_decode_inter(TgvContext *s, AVFrame *frame, |
const uint8_t *buf, const uint8_t *buf_end) |
{ |
int num_mvs; |
int num_blocks_raw; |
int num_blocks_packed; |
int vector_bits; |
int i,j,x,y; |
GetBitContext gb; |
int mvbits; |
const uint8_t *blocks_raw; |
|
if(buf_end - buf < 12) |
return AVERROR_INVALIDDATA; |
|
num_mvs = AV_RL16(&buf[0]); |
num_blocks_raw = AV_RL16(&buf[2]); |
num_blocks_packed = AV_RL16(&buf[4]); |
vector_bits = AV_RL16(&buf[6]); |
buf += 12; |
|
if (vector_bits > MIN_CACHE_BITS || !vector_bits) { |
av_log(s->avctx, AV_LOG_ERROR, |
"Invalid value for motion vector bits: %d\n", vector_bits); |
return AVERROR_INVALIDDATA; |
} |
|
/* allocate codebook buffers as necessary */ |
if (num_mvs > s->num_mvs) { |
if (av_reallocp_array(&s->mv_codebook, num_mvs, sizeof(*s->mv_codebook))) { |
s->num_mvs = 0; |
return AVERROR(ENOMEM); |
} |
s->num_mvs = num_mvs; |
} |
|
if (num_blocks_packed > s->num_blocks_packed) { |
if (av_reallocp_array(&s->block_codebook, num_blocks_packed, sizeof(*s->block_codebook))) { |
s->num_blocks_packed = 0; |
return AVERROR(ENOMEM); |
} |
s->num_blocks_packed = num_blocks_packed; |
} |
|
/* read motion vectors */ |
mvbits = (num_mvs * 2 * 10 + 31) & ~31; |
|
if (buf_end - buf < (mvbits>>3) + 16*num_blocks_raw + 8*num_blocks_packed) |
return AVERROR_INVALIDDATA; |
|
init_get_bits(&gb, buf, mvbits); |
for (i = 0; i < num_mvs; i++) { |
s->mv_codebook[i][0] = get_sbits(&gb, 10); |
s->mv_codebook[i][1] = get_sbits(&gb, 10); |
} |
buf += mvbits >> 3; |
|
/* note ptr to uncompressed blocks */ |
blocks_raw = buf; |
buf += num_blocks_raw * 16; |
|
/* read compressed blocks */ |
init_get_bits(&gb, buf, (buf_end - buf) << 3); |
for (i = 0; i < num_blocks_packed; i++) { |
int tmp[4]; |
for (j = 0; j < 4; j++) |
tmp[j] = get_bits(&gb, 8); |
for (j = 0; j < 16; j++) |
s->block_codebook[i][15-j] = tmp[get_bits(&gb, 2)]; |
} |
|
if (get_bits_left(&gb) < vector_bits * |
(s->avctx->height / 4) * (s->avctx->width / 4)) |
return AVERROR_INVALIDDATA; |
|
/* read vectors and build frame */ |
for (y = 0; y < s->avctx->height / 4; y++) |
for (x = 0; x < s->avctx->width / 4; x++) { |
unsigned int vector = get_bits(&gb, vector_bits); |
const uint8_t *src; |
int src_stride; |
|
if (vector < num_mvs) { |
int mx = x * 4 + s->mv_codebook[vector][0]; |
int my = y * 4 + s->mv_codebook[vector][1]; |
|
if (mx < 0 || mx + 4 > s->avctx->width || |
my < 0 || my + 4 > s->avctx->height) { |
av_log(s->avctx, AV_LOG_ERROR, "MV %d %d out of picture\n", mx, my); |
continue; |
} |
|
src = s->last_frame.data[0] + mx + my * s->last_frame.linesize[0]; |
src_stride = s->last_frame.linesize[0]; |
} else { |
int offset = vector - num_mvs; |
if (offset < num_blocks_raw) |
src = blocks_raw + 16*offset; |
else if (offset - num_blocks_raw < num_blocks_packed) |
src = s->block_codebook[offset - num_blocks_raw]; |
else |
continue; |
src_stride = 4; |
} |
|
for (j = 0; j < 4; j++) |
for (i = 0; i < 4; i++) |
frame->data[0][(y * 4 + j) * frame->linesize[0] + (x * 4 + i)] = |
src[j * src_stride + i]; |
} |
|
return 0; |
} |
|
static int tgv_decode_frame(AVCodecContext *avctx, |
void *data, int *got_frame, |
AVPacket *avpkt) |
{ |
const uint8_t *buf = avpkt->data; |
int buf_size = avpkt->size; |
TgvContext *s = avctx->priv_data; |
const uint8_t *buf_end = buf + buf_size; |
AVFrame *frame = data; |
int chunk_type, ret; |
|
if (buf_end - buf < EA_PREAMBLE_SIZE) |
return AVERROR_INVALIDDATA; |
|
chunk_type = AV_RL32(&buf[0]); |
buf += EA_PREAMBLE_SIZE; |
|
if (chunk_type == kVGT_TAG) { |
int pal_count, i; |
if(buf_end - buf < 12) { |
av_log(avctx, AV_LOG_WARNING, "truncated header\n"); |
return AVERROR_INVALIDDATA; |
} |
|
s->width = AV_RL16(&buf[0]); |
s->height = AV_RL16(&buf[2]); |
if (s->avctx->width != s->width || s->avctx->height != s->height) { |
avcodec_set_dimensions(s->avctx, s->width, s->height); |
av_freep(&s->frame_buffer); |
av_frame_unref(&s->last_frame); |
} |
|
pal_count = AV_RL16(&buf[6]); |
buf += 12; |
for(i = 0; i < pal_count && i < AVPALETTE_COUNT && buf_end - buf >= 3; i++) { |
s->palette[i] = 0xFFU << 24 | AV_RB24(buf); |
buf += 3; |
} |
} |
|
if ((ret = av_image_check_size(s->width, s->height, 0, avctx)) < 0) |
return ret; |
|
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0) |
return ret; |
|
memcpy(frame->data[1], s->palette, AVPALETTE_SIZE); |
|
if (chunk_type == kVGT_TAG) { |
int y; |
frame->key_frame = 1; |
frame->pict_type = AV_PICTURE_TYPE_I; |
|
if (!s->frame_buffer && |
!(s->frame_buffer = av_malloc(s->width * s->height))) |
return AVERROR(ENOMEM); |
|
if (unpack(buf, buf_end, s->frame_buffer, s->avctx->width, s->avctx->height) < 0) { |
av_log(avctx, AV_LOG_WARNING, "truncated intra frame\n"); |
return AVERROR_INVALIDDATA; |
} |
for (y = 0; y < s->height; y++) |
memcpy(frame->data[0] + y * frame->linesize[0], |
s->frame_buffer + y * s->width, |
s->width); |
} else { |
if (!s->last_frame.data[0]) { |
av_log(avctx, AV_LOG_WARNING, "inter frame without corresponding intra frame\n"); |
return buf_size; |
} |
frame->key_frame = 0; |
frame->pict_type = AV_PICTURE_TYPE_P; |
if (tgv_decode_inter(s, frame, buf, buf_end) < 0) { |
av_log(avctx, AV_LOG_WARNING, "truncated inter frame\n"); |
return AVERROR_INVALIDDATA; |
} |
} |
|
av_frame_unref(&s->last_frame); |
if ((ret = av_frame_ref(&s->last_frame, frame)) < 0) |
return ret; |
|
*got_frame = 1; |
|
return buf_size; |
} |
|
static av_cold int tgv_decode_end(AVCodecContext *avctx) |
{ |
TgvContext *s = avctx->priv_data; |
av_frame_unref(&s->last_frame); |
av_freep(&s->frame_buffer); |
av_free(s->mv_codebook); |
av_free(s->block_codebook); |
return 0; |
} |
|
AVCodec ff_eatgv_decoder = { |
.name = "eatgv", |
.long_name = NULL_IF_CONFIG_SMALL("Electronic Arts TGV video"), |
.type = AVMEDIA_TYPE_VIDEO, |
.id = AV_CODEC_ID_TGV, |
.priv_data_size = sizeof(TgvContext), |
.init = tgv_decode_init, |
.close = tgv_decode_end, |
.decode = tgv_decode_frame, |
.capabilities = CODEC_CAP_DR1, |
}; |