Fraps v2 and v4 support

Originally committed as revision 6896 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Kostya Shishkov 18 years ago
parent 13638ea92a
commit 08a4c4bfb9
  1. 188
      libavcodec/fraps.c

@ -1,6 +1,7 @@
/*
* Fraps FPS1 decoder
* Copyright (c) 2005 Roine Gustafsson
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of FFmpeg.
*
@ -24,24 +25,42 @@
* @file fraps.c
* Lossless Fraps 'FPS1' decoder
* @author Roine Gustafsson <roine at users sf net>
* @author Konstantin Shishkov
*
* Only decodes version 0 and 1 files.
* Codec algorithm for version 0 is taken from Transcode <www.transcoding.org>
*
* Version 2 files, which are the most commonly found Fraps files, cannot be
* decoded yet.
* Version 2 files support by Konstantin Shishkov
*/
#include "avcodec.h"
#include "bitstream.h"
#include "dsputil.h"
#define FPS_TAG MKTAG('F', 'P', 'S', 'x')
/* symbol for Huffman tree node */
#define HNODE -1
/**
* Huffman node
* FIXME one day this should belong to one general framework
*/
typedef struct Node{
int16_t sym;
int16_t n0;
int count;
}Node;
/**
* local variable storage
*/
typedef struct FrapsContext{
AVCodecContext *avctx;
AVFrame frame;
Node nodes[512];
uint8_t *tmpbuf;
DSPContext dsp;
} FrapsContext;
@ -60,10 +79,110 @@ static int decode_init(AVCodecContext *avctx)
s->avctx = avctx;
s->frame.data[0] = NULL;
s->tmpbuf = NULL;
dsputil_init(&s->dsp, avctx);
return 0;
}
/**
* Comparator - our nodes should ascend by count
* but with preserved symbol order
*/
static int huff_cmp(const Node *a, const Node *b){
return (a->count - b->count)*256 + a->sym - b->sym;
}
static void get_tree_codes(uint32_t *bits, int16_t *lens, Node *nodes, int node, uint32_t pfx, int pl)
{
int s;
s = nodes[node].sym;
if(s != HNODE){
bits[s] = pfx;
lens[s] = pl;
}else{
pfx <<= 1;
pl++;
get_tree_codes(bits, lens, nodes, nodes[node].n0, pfx, pl);
pfx |= 1;
get_tree_codes(bits, lens, nodes, nodes[node].n0+1, pfx, pl);
}
}
static int build_huff_tree(VLC *vlc, Node *nodes)
{
uint32_t bits[256];
int16_t lens[256];
get_tree_codes(bits, lens, nodes, 510, 0, 0);
return init_vlc(vlc, 9, 256, lens, 2, 2, bits, 4, 4, 0);
}
/**
* decode Fraps v2 packed plane
*/
static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
int h, uint8_t *src, int size, int Uoff)
{
int i, j;
int cur_node;
GetBitContext gb;
VLC vlc;
int64_t sum = 0;
for(i = 0; i < 256; i++){
s->nodes[i].sym = i;
s->nodes[i].count = LE_32(src);
s->nodes[i].n0 = -2;
src += 4;
sum += s->nodes[i].count;
}
size -= 1024;
if(sum >> 31) {
av_log(s->avctx, AV_LOG_ERROR, "Too high symbol frequencies. Tree construction is not possible\n");
return -1;
}
qsort(s->nodes, 256, sizeof(Node), huff_cmp);
cur_node = 256;
// FIXME how it will handle nodes with zero count?
for(i = 0; i < 511; i += 2){
s->nodes[cur_node].sym = HNODE;
s->nodes[cur_node].count = s->nodes[i].count + s->nodes[i+1].count;
s->nodes[cur_node].n0 = i;
for(j = cur_node; j > 0; j--){
if(s->nodes[j].count >= s->nodes[j - 1].count) break;
FFSWAP(Node, s->nodes[j], s->nodes[j - 1]);
}
cur_node++;
}
if(build_huff_tree(&vlc, s->nodes) < 0){
av_log(s->avctx, AV_LOG_ERROR, "Error building tree\n");
return -1;
}
/* we have built Huffman table and are ready to decode plane */
/* convert bits so they may be used by standard bitreader */
s->dsp.bswap_buf(s->tmpbuf, src, size >> 2);
init_get_bits(&gb, s->tmpbuf, size * 8);
for(j = 0; j < h; j++){
for(i = 0; i < w; i++){
dst[i] = get_vlc2(&gb, vlc.table, 9, 3);
/* lines are stored as deltas between previous lines
* and we need to add 0x80 to the first lines of chroma planes
*/
if(j) dst[i] += dst[i - stride];
else if(Uoff) dst[i] += 0x80;
}
dst += stride;
}
free_vlc(&vlc);
return 0;
}
/**
* decode a frame
@ -86,16 +205,18 @@ static int decode_frame(AVCodecContext *avctx,
unsigned int x, y;
uint32_t *buf32;
uint32_t *luma1,*luma2,*cb,*cr;
uint32_t offs[4];
int i, is_chroma, planes;
header = LE_32(buf);
version = header & 0xff;
header_size = (header & (1<<30))? 8 : 4; /* bit 30 means pad to 8 bytes */
if (version > 1) {
if (version > 2 && version != 4) {
av_log(avctx, AV_LOG_ERROR,
"This file is encoded with Fraps version %d. " \
"This codec can only decode version 0 and 1.\n", version);
"This codec can only decode version 0, 1, 2 and 4.\n", version);
return -1;
}
@ -187,30 +308,50 @@ static int decode_frame(AVCodecContext *avctx,
break;
case 2:
case 4:
/**
* Fraps v2 sub-header description. All numbers are little-endian:
* (this is all guesswork)
*
* 0: DWORD 'FPSx'
* 4: DWORD 0x00000010 unknown, perhaps flags
* 8: DWORD off_2 offset to plane 2
* 12: DWORD off_3 offset to plane 3
* 16: 256xDWORD freqtbl_1 frequency table for plane 1
* 1040: plane_1
* ...
* off_2: 256xDWORD freqtbl_2 frequency table for plane 2
* plane_2
* ...
* off_3: 256xDWORD freqtbl_3 frequency table for plane 3
* plane_3
* Fraps v2 is Huffman-coded YUV420 planes
* Fraps v4 is the same except it works in grayscale
*/
if ((BE_32(buf) != FPS_TAG)||(buf_size < (3*1024 + 8))) {
avctx->pix_fmt = (version == 2) ? PIX_FMT_YUV420P : PIX_FMT_GRAY8;
planes = (version == 2) ? 3 : 1;
f->reference = 1;
f->buffer_hints = FF_BUFFER_HINTS_VALID |
FF_BUFFER_HINTS_PRESERVE |
FF_BUFFER_HINTS_REUSABLE;
if (avctx->reget_buffer(avctx, f)) {
av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
return -1;
}
/* skip frame */
if(buf_size == 8) {
f->pict_type = FF_P_TYPE;
f->key_frame = 0;
break;
}
f->pict_type = FF_I_TYPE;
f->key_frame = 1;
if ((LE_32(buf) != FPS_TAG)||(buf_size < (planes*1024 + 24))) {
av_log(avctx, AV_LOG_ERROR, "Fraps: error in data stream\n");
return -1;
}
/* NOT FINISHED */
for(i = 0; i < planes; i++) {
offs[i] = LE_32(buf + 4 + i * 4);
if(offs[i] >= buf_size || (i && offs[i] <= offs[i - 1] + 1024)) {
av_log(avctx, AV_LOG_ERROR, "Fraps: plane %i offset is out of bounds\n", i);
return -1;
}
}
offs[planes] = buf_size;
for(i = 0; i < planes; i++){
is_chroma = !!i;
s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024);
if(fraps2_decode_plane(s, f->data[i], f->linesize[i], avctx->width >> is_chroma,
avctx->height >> is_chroma, buf + offs[i], offs[i + 1] - offs[i], is_chroma) < 0) {
av_log(avctx, AV_LOG_ERROR, "Error decoding plane %i\n", i);
return -1;
}
}
break;
}
@ -233,6 +374,7 @@ static int decode_end(AVCodecContext *avctx)
if (s->frame.data[0])
avctx->release_buffer(avctx, &s->frame);
av_freep(&s->tmpbuf);
return 0;
}

Loading…
Cancel
Save