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avcodec/magicyuv: Unify creating Huffman tables

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Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-08-31 20:49:13 +02:00
parent aae499f77a
commit 61499c6456
1 changed files with 6 additions and 65 deletions
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71
libavcodec/magicyuv.c
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@ -70,7 +70,6 @@ typedef struct MagicYUVContext {
unsigned int slices_size[4]; // slice sizes for each plane
uint8_t len[4096]; // scratch table of code lengths
VLC vlc[4]; // VLC for each plane
int (*huff_build)(VLC *vlc, uint8_t *len);
int (*magy_decode_slice)(AVCodecContext *avctx, void *tdata,
int j, int threadnr);
LLVidDSPContext llviddsp;
@ -82,82 +81,28 @@ static int huff_cmp_len(const void *a, const void *b)
return (aa->len - bb->len) * 4096 + bb->sym - aa->sym;
}
static int huff_build10(VLC *vlc, uint8_t *len)
{
HuffEntry he[1024];
uint32_t code;
int i;
for (i = 0; i < 1024; i++) {
he[i].sym = i;
he[i].len = len[i];
if (len[i] == 0 || len[i] > 32)
return AVERROR_INVALIDDATA;
}
AV_QSORT(he, 1024, HuffEntry, huff_cmp_len);
code = 1;
for (i = 1023; i >= 0; i--) {
he[i].code = code >> (32 - he[i].len);
code += 0x80000000u >> (he[i].len - 1);
}
ff_free_vlc(vlc);
return ff_init_vlc_sparse(vlc, FFMIN(he[1023].len, 12), 1024,
&he[0].len, sizeof(he[0]), sizeof(he[0].len),
&he[0].code, sizeof(he[0]), sizeof(he[0].code),
&he[0].sym, sizeof(he[0]), sizeof(he[0].sym), 0);
}
static int huff_build12(VLC *vlc, uint8_t *len)
static int huff_build(VLC *vlc, uint8_t *len, int nb_elems)
{
HuffEntry he[4096];
uint32_t code;
int i;
for (i = 0; i < 4096; i++) {
for (i = 0; i < nb_elems; i++) {
he[i].sym = i;
he[i].len = len[i];
if (len[i] == 0 || len[i] > 32)
return AVERROR_INVALIDDATA;
}
AV_QSORT(he, 4096, HuffEntry, huff_cmp_len);
AV_QSORT(he, nb_elems, HuffEntry, huff_cmp_len);
code = 1;
for (i = 4095; i >= 0; i--) {
for (i = nb_elems - 1; i >= 0; i--) {
he[i].code = code >> (32 - he[i].len);
code += 0x80000000u >> (he[i].len - 1);
}
ff_free_vlc(vlc);
return ff_init_vlc_sparse(vlc, FFMIN(he[4095].len, 12), 4096,
&he[0].len, sizeof(he[0]), sizeof(he[0].len),
&he[0].code, sizeof(he[0]), sizeof(he[0].code),
&he[0].sym, sizeof(he[0]), sizeof(he[0].sym), 0);
}
static int huff_build(VLC *vlc, uint8_t *len)
{
HuffEntry he[256];
uint32_t code;
int i;
for (i = 0; i < 256; i++) {
he[i].sym = i;
he[i].len = len[i];
if (len[i] == 0 || len[i] > 32)
return AVERROR_INVALIDDATA;
}
AV_QSORT(he, 256, HuffEntry, huff_cmp_len);
code = 1;
for (i = 255; i >= 0; i--) {
he[i].code = code >> (32 - he[i].len);
code += 0x80000000u >> (he[i].len - 1);
}
ff_free_vlc(vlc);
return ff_init_vlc_sparse(vlc, FFMIN(he[255].len, 12), 256,
return ff_init_vlc_sparse(vlc, FFMIN(he[nb_elems - 1].len, 12), nb_elems,
&he[0].len, sizeof(he[0]), sizeof(he[0].len),
&he[0].code, sizeof(he[0]), sizeof(he[0].code),
&he[0].sym, sizeof(he[0]), sizeof(he[0].sym), 0);
@ -469,7 +414,7 @@ static int build_huffman(AVCodecContext *avctx, GetBitContext *gbit, int max)
if (j == max) {
j = 0;
if (s->huff_build(&s->vlc[i], s->len)) {
if (huff_build(&s->vlc[i], s->len, max)) {
av_log(avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n");
return AVERROR_INVALIDDATA;
}
@ -595,10 +540,6 @@ static int magy_decode_frame(AVCodecContext *avctx, void *data,
}
s->max = 1 << s->bps;
s->magy_decode_slice = s->bps == 8 ? magy_decode_slice : magy_decode_slice10;
if ( s->bps == 8)
s->huff_build = huff_build;
else
s->huff_build = s->bps == 10 ? huff_build10 : huff_build12;
s->planes = av_pix_fmt_count_planes(avctx->pix_fmt);
bytestream2_skip(&gbyte, 1);