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Correct support for Fraps v4 (and Huffman tree for < 256 symbols) 

Originally committed as revision 6898 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Kostya Shishkov 2006-11-05 08:18:52 +00:00
parent 78629a746f
commit 75a71b6c38
1 changed files with 19 additions and 16 deletions
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35
libavcodec/fraps.c
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@ -93,30 +93,33 @@ 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)
static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat, Node *nodes, int node, uint32_t pfx, int pl, int *pos)
{
int s;
s = nodes[node].sym;
if(s != HNODE){
bits[s] = pfx;
lens[s] = pl;
if(s != HNODE || !nodes[node].count){
bits[*pos] = pfx;
lens[*pos] = pl;
xlat[*pos] = s;
(*pos)++;
}else{
pfx <<= 1;
pl++;
get_tree_codes(bits, lens, nodes, nodes[node].n0, pfx, pl);
get_tree_codes(bits, lens, xlat, nodes, nodes[node].n0, pfx, pl, pos);
pfx |= 1;
get_tree_codes(bits, lens, nodes, nodes[node].n0+1, pfx, pl);
get_tree_codes(bits, lens, xlat, nodes, nodes[node].n0+1, pfx, pl, pos);
}
}
static int build_huff_tree(VLC *vlc, Node *nodes)
static int build_huff_tree(VLC *vlc, Node *nodes, uint8_t *xlat)
{
uint32_t bits[256];
int16_t lens[256];
int pos = 0;
get_tree_codes(bits, lens, nodes, 510, 0, 0);
return init_vlc(vlc, 9, 256, lens, 2, 2, bits, 4, 4, 0);
get_tree_codes(bits, lens, xlat, nodes, 510, 0, 0, &pos);
return init_vlc(vlc, 9, pos, lens, 2, 2, bits, 4, 4, 0);
}
@ -131,6 +134,7 @@ static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
GetBitContext gb;
VLC vlc;
int64_t sum = 0;
uint8_t recode[256];
for(i = 0; i < 256; i++){
s->nodes[i].sym = i;
@ -147,7 +151,6 @@ static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
}
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;
@ -158,7 +161,7 @@ static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
}
cur_node++;
}
if(build_huff_tree(&vlc, s->nodes) < 0){
if(build_huff_tree(&vlc, s->nodes, recode) < 0){
av_log(s->avctx, AV_LOG_ERROR, "Error building tree\n");
return -1;
}
@ -170,7 +173,7 @@ static int fraps2_decode_plane(FrapsContext *s, uint8_t *dst, int stride, int w,
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);
dst[i] = recode[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
*/
@ -310,10 +313,10 @@ static int decode_frame(AVCodecContext *avctx,
case 4:
/**
* Fraps v2 is Huffman-coded YUV420 planes
* Fraps v4 is the same except it works in grayscale
* Fraps v4 is virtually the same
*/
avctx->pix_fmt = (version == 2) ? PIX_FMT_YUV420P : PIX_FMT_GRAY8;
planes = (version == 2) ? 3 : 1;
avctx->pix_fmt = PIX_FMT_YUV420P;
planes = 3;
f->reference = 1;
f->buffer_hints = FF_BUFFER_HINTS_VALID |
FF_BUFFER_HINTS_PRESERVE |
@ -344,7 +347,7 @@ static int decode_frame(AVCodecContext *avctx,
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);
s->tmpbuf = av_realloc(s->tmpbuf, offs[i + 1] - offs[i] - 1024 + FF_INPUT_BUFFER_PADDING_SIZE);
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);