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avcodec/huffman: extend ff_huff_gen_len_table() to allow >8bit

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-01-13 01:03:54 +01:00
parent af68bd1c06
commit 7b41cbac7f
4 changed files with 22 additions and 9 deletions
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20
libavcodec/huffman.c
View File

@ -52,13 +52,18 @@ static void heap_sift(HeapElem *h, int root, int size)
}
}
void ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats)
int ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats, int size)
{
HeapElem h[256];
int up[2*256];
int len[2*256];
HeapElem *h = av_malloc(sizeof(*h) * size);
int *up = av_malloc(sizeof(*up) * 2 * size);
uint8_t *len = av_malloc(sizeof(*len) * 2 * size);
int offset, i, next;
int size = 256;
int ret = 0;
if (!h || !up || !len) {
ret = AVERROR(ENOMEM);
goto end;
}
for (offset = 1; ; offset <<= 1) {
for (i=0; i < size; i++) {
@ -89,6 +94,11 @@ void ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats)
}
if (i==size) break;
}
end:
av_free(h);
av_free(up);
av_free(len);
return ret;
}
static void get_tree_codes(uint32_t *bits, int16_t *lens, uint8_t *xlat,

2
libavcodec/huffman.h
View File

@ -43,6 +43,6 @@ typedef int (*HuffCmp)(const void *va, const void *vb);
int ff_huff_build_tree(AVCodecContext *avctx, VLC *vlc, int nb_codes, int nb_bits,
Node *nodes, HuffCmp cmp, int flags);
void ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats);
int ff_huff_gen_len_table(uint8_t *dst, const uint64_t *stats, int n);
#endif /* AVCODEC_HUFFMAN_H */

5
libavcodec/huffyuvenc.c
View File

@ -144,7 +144,7 @@ static int store_table(HYuvContext *s, const uint8_t *len, uint8_t *buf)
static int store_huffman_tables(HYuvContext *s, uint8_t *buf)
{
int i;
int i, ret;
int size = 0;
int count = 3;
@ -152,7 +152,8 @@ static int store_huffman_tables(HYuvContext *s, uint8_t *buf)
count = 1 + s->alpha + 2*s->chroma;
for (i = 0; i < count; i++) {
ff_huff_gen_len_table(s->len[i], s->stats[i]);
if ((ret = ff_huff_gen_len_table(s->len[i], s->stats[i], 256)) < 0)
return ret;
if (ff_huffyuv_generate_bits_table(s->bits[i], s->len[i]) < 0) {
return -1;

4
libavcodec/utvideoenc.c
View File

@ -363,6 +363,7 @@ static int encode_plane(AVCodecContext *avctx, uint8_t *src,
uint32_t offset = 0, slice_len = 0;
int i, sstart, send = 0;
int symbol;
int ret;
/* Do prediction / make planes */
switch (c->frame_pred) {
@ -429,7 +430,8 @@ static int encode_plane(AVCodecContext *avctx, uint8_t *src,
}
/* Calculate huffman lengths */
ff_huff_gen_len_table(lengths, counts);
if ((ret = ff_huff_gen_len_table(lengths, counts, 256)) < 0)
return ret;
/*
* Write the plane's header into the output packet: