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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00

avcodec/exr: piz decompression

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-02-27 19:29:39 +00:00
parent 4d41a25d39
commit 4413dcc035

View File

@ -32,6 +32,7 @@
#include <zlib.h>
#include "get_bits.h"
#include "avcodec.h"
#include "bytestream.h"
#include "mathops.h"
@ -67,6 +68,9 @@ typedef struct EXRThreadData {
uint8_t *tmp;
int tmp_size;
uint8_t *bitmap;
uint16_t *lut;
} EXRThreadData;
typedef struct EXRContext {
@ -277,6 +281,461 @@ static int rle_uncompress(const uint8_t *src, int compressed_size,
return 0;
}
#define USHORT_RANGE (1 << 16)
#define BITMAP_SIZE (1 << 13)
static uint16_t reverse_lut(const uint8_t *bitmap, uint16_t *lut)
{
int i, k = 0;
for (i = 0; i < USHORT_RANGE; i++) {
if ((i == 0) || (bitmap[i >> 3] & (1 << (i & 7))))
lut[k++] = i;
}
i = k - 1;
memset(lut + k, 0, (USHORT_RANGE - k) * 2);
return i;
}
static void apply_lut(const uint16_t *lut, uint16_t *dst, int dsize)
{
int i;
for (i = 0; i < dsize; ++i)
dst[i] = lut[dst[i]];
}
#define HUF_ENCBITS 16 // literal (value) bit length
#define HUF_DECBITS 14 // decoding bit size (>= 8)
#define HUF_ENCSIZE ((1 << HUF_ENCBITS) + 1) // encoding table size
#define HUF_DECSIZE (1 << HUF_DECBITS) // decoding table size
#define HUF_DECMASK (HUF_DECSIZE - 1)
typedef struct HufDec {
int len;
int lit;
int *p;
} HufDec;
static void huf_canonical_code_table(uint64_t *hcode)
{
uint64_t c, n[59] = { 0 };
int i;
for (i = 0; i < HUF_ENCSIZE; ++i)
n[hcode[i]] += 1;
c = 0;
for (i = 58; i > 0; --i) {
uint64_t nc = ((c + n[i]) >> 1);
n[i] = c;
c = nc;
}
for (i = 0; i < HUF_ENCSIZE; ++i) {
int l = hcode[i];
if (l > 0)
hcode[i] = l | (n[l]++ << 6);
}
}
#define SHORT_ZEROCODE_RUN 59
#define LONG_ZEROCODE_RUN 63
#define SHORTEST_LONG_RUN (2 + LONG_ZEROCODE_RUN - SHORT_ZEROCODE_RUN)
#define LONGEST_LONG_RUN (255 + SHORTEST_LONG_RUN)
static int huf_unpack_enc_table(GetByteContext *gb,
int32_t im, int32_t iM, uint64_t *hcode)
{
GetBitContext gbit;
init_get_bits8(&gbit, gb->buffer, bytestream2_get_bytes_left(gb));
for (; im <= iM; im++) {
uint64_t l = hcode[im] = get_bits(&gbit, 6);
if (l == LONG_ZEROCODE_RUN) {
int zerun = get_bits(&gbit, 8) + SHORTEST_LONG_RUN;
if (im + zerun > iM + 1)
return AVERROR_INVALIDDATA;
while (zerun--)
hcode[im++] = 0;
im--;
} else if (l >= (uint64_t) SHORT_ZEROCODE_RUN) {
int zerun = l - SHORT_ZEROCODE_RUN + 2;
if (im + zerun > iM + 1)
return AVERROR_INVALIDDATA;
while (zerun--)
hcode[im++] = 0;
im--;
}
}
bytestream2_skip(gb, (get_bits_count(&gbit) + 7) / 8);
huf_canonical_code_table(hcode);
return 0;
}
static int huf_build_dec_table(const uint64_t *hcode, int im,
int iM, HufDec *hdecod)
{
for (; im <= iM; im++) {
uint64_t c = hcode[im] >> 6;
int i, l = hcode[im] & 63;
if (c >> l)
return AVERROR_INVALIDDATA;
if (l > HUF_DECBITS) {
HufDec *pl = hdecod + (c >> (l - HUF_DECBITS));
if (pl->len)
return AVERROR_INVALIDDATA;
pl->lit++;
pl->p = av_realloc_f(pl->p, pl->lit, sizeof(int));
if (!pl->p)
return AVERROR(ENOMEM);
pl->p[pl->lit - 1] = im;
} else if (l) {
HufDec *pl = hdecod + (c << (HUF_DECBITS - l));
for (i = 1 << (HUF_DECBITS - l); i > 0; i--, pl++) {
if (pl->len || pl->p)
return AVERROR_INVALIDDATA;
pl->len = l;
pl->lit = im;
}
}
}
return 0;
}
#define get_char(c, lc, gb) { \
c = (c << 8) | bytestream2_get_byte(gb); \
lc += 8; \
}
#define get_code(po, rlc, c, lc, gb, out, oe) { \
if (po == rlc) { \
if (lc < 8) \
get_char(c, lc, gb); \
lc -= 8; \
\
cs = c >> lc; \
\
if (out + cs > oe) \
return AVERROR_INVALIDDATA; \
\
s = out[-1]; \
\
while (cs-- > 0) \
*out++ = s; \
} else if (out < oe) { \
*out++ = po; \
} else { \
return AVERROR_INVALIDDATA; \
} \
}
static int huf_decode(const uint64_t *hcode, const HufDec *hdecod,
GetByteContext *gb, int nbits,
int rlc, int no, uint16_t *out)
{
uint64_t c = 0;
uint16_t *outb = out;
uint16_t *oe = out + no;
const uint8_t *ie = gb->buffer + (nbits + 7) / 8; // input byte size
uint8_t cs, s;
int i, lc = 0;
while (gb->buffer < ie) {
get_char(c, lc, gb);
while (lc >= HUF_DECBITS) {
const HufDec pl = hdecod[(c >> (lc-HUF_DECBITS)) & HUF_DECMASK];
if (pl.len) {
lc -= pl.len;
get_code(pl.lit, rlc, c, lc, gb, out, oe);
} else {
int j;
if (!pl.p)
return AVERROR_INVALIDDATA;
for (j = 0; j < pl.lit; j++) {
int l = hcode[pl.p[j]] & 63;
while (lc < l && bytestream2_get_bytes_left(gb) > 0)
get_char(c, lc, gb);
if (lc >= l) {
if ((hcode[pl.p[j]] >> 6) ==
((c >> (lc - l)) & ((1LL << l) - 1))) {
lc -= l;
get_code(pl.p[j], rlc, c, lc, gb, out, oe);
break;
}
}
}
if (j == pl.lit)
return AVERROR_INVALIDDATA;
}
}
}
i = (8 - nbits) & 7;
c >>= i;
lc -= i;
while (lc > 0) {
const HufDec pl = hdecod[(c << (HUF_DECBITS - lc)) & HUF_DECMASK];
if (pl.len) {
lc -= pl.len;
get_code(pl.lit, rlc, c, lc, gb, out, oe);
} else {
return AVERROR_INVALIDDATA;
}
}
if (out - outb != no)
return AVERROR_INVALIDDATA;
return 0;
}
static int huf_uncompress(GetByteContext *gb,
uint16_t *dst, int dst_size)
{
int32_t src_size, im, iM;
uint32_t nBits;
uint64_t *freq;
HufDec *hdec;
int ret, i;
src_size = bytestream2_get_le32(gb);
im = bytestream2_get_le32(gb);
iM = bytestream2_get_le32(gb);
bytestream2_skip(gb, 4);
nBits = bytestream2_get_le32(gb);
if (im < 0 || im >= HUF_ENCSIZE ||
iM < 0 || iM >= HUF_ENCSIZE ||
src_size < 0)
return AVERROR_INVALIDDATA;
bytestream2_skip(gb, 4);
freq = av_calloc(HUF_ENCSIZE, sizeof(*freq));
hdec = av_calloc(HUF_DECSIZE, sizeof(*hdec));
if (!freq || !hdec) {
ret = AVERROR(ENOMEM);
goto fail;
}
if ((ret = huf_unpack_enc_table(gb, im, iM, freq)) < 0)
goto fail;
if (nBits > 8 * bytestream2_get_bytes_left(gb)) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
if ((ret = huf_build_dec_table(freq, im, iM, hdec)) < 0)
goto fail;
ret = huf_decode(freq, hdec, gb, nBits, iM, dst_size, dst);
fail:
for (i = 0; i < HUF_DECSIZE; i++) {
if (hdec[i].p)
av_free(hdec[i].p);
}
av_free(freq);
av_free(hdec);
return ret;
}
static inline void wdec14(uint16_t l, uint16_t h, uint16_t *a, uint16_t *b)
{
int16_t ls = l;
int16_t hs = h;
int hi = hs;
int ai = ls + (hi & 1) + (hi >> 1);
int16_t as = ai;
int16_t bs = ai - hi;
*a = as;
*b = bs;
}
#define NBITS 16
#define A_OFFSET (1 << (NBITS - 1))
#define MOD_MASK ((1 << NBITS) - 1)
static inline void wdec16(uint16_t l, uint16_t h, uint16_t *a, uint16_t *b)
{
int m = l;
int d = h;
int bb = (m - (d >> 1)) & MOD_MASK;
int aa = (d + bb - A_OFFSET) & MOD_MASK;
*b = bb;
*a = aa;
}
static void wav_decode(uint16_t *in, int nx, int ox,
int ny, int oy, uint16_t mx)
{
int w14 = (mx < (1 << 14));
int n = (nx > ny) ? ny: nx;
int p = 1;
int p2;
while (p <= n)
p <<= 1;
p >>= 1;
p2 = p;
p >>= 1;
while (p >= 1) {
uint16_t *py = in;
uint16_t *ey = in + oy * (ny - p2);
uint16_t i00, i01, i10, i11;
int oy1 = oy * p;
int oy2 = oy * p2;
int ox1 = ox * p;
int ox2 = ox * p2;
for (; py <= ey; py += oy2) {
uint16_t *px = py;
uint16_t *ex = py + ox * (nx - p2);
for (; px <= ex; px += ox2) {
uint16_t *p01 = px + ox1;
uint16_t *p10 = px + oy1;
uint16_t *p11 = p10 + ox1;
if (w14) {
wdec14(*px, *p10, &i00, &i10);
wdec14(*p01, *p11, &i01, &i11);
wdec14(i00, i01, px, p01);
wdec14(i10, i11, p10, p11);
} else {
wdec16(*px, *p10, &i00, &i10);
wdec16(*p01, *p11, &i01, &i11);
wdec16(i00, i01, px, p01);
wdec16(i10, i11, p10, p11);
}
}
if (nx & p) {
uint16_t *p10 = px + oy1;
if (w14)
wdec14(*px, *p10, &i00, p10);
else
wdec16(*px, *p10, &i00, p10);
*px = i00;
}
}
if (ny & p) {
uint16_t *px = py;
uint16_t *ex = py + ox * (nx - p2);
for (; px <= ex; px += ox2) {
uint16_t *p01 = px + ox1;
if (w14)
wdec14(*px, *p01, &i00, p01);
else
wdec16(*px, *p01, &i00, p01);
*px = i00;
}
}
p2 = p;
p >>= 1;
}
}
static int piz_uncompress(EXRContext *s, const uint8_t *src, int ssize, int dsize, EXRThreadData *td)
{
GetByteContext gb;
uint16_t maxval, min_non_zero, max_non_zero;
uint16_t *ptr, *tmp = (uint16_t *)td->tmp;
int8_t *out;
int ret, i, j;
if (!td->bitmap)
td->bitmap = av_malloc(BITMAP_SIZE);
if (!td->lut)
td->lut = av_malloc(1 << 17);
if (!td->bitmap || !td->lut)
return AVERROR(ENOMEM);
bytestream2_init(&gb, src, ssize);
min_non_zero = bytestream2_get_le16(&gb);
max_non_zero = bytestream2_get_le16(&gb);
if (max_non_zero >= BITMAP_SIZE)
return AVERROR_INVALIDDATA;
memset(td->bitmap, 0, FFMIN(min_non_zero, BITMAP_SIZE));
if (min_non_zero <= max_non_zero)
bytestream2_get_buffer(&gb, td->bitmap + min_non_zero,
max_non_zero - min_non_zero + 1);
memset(td->bitmap + max_non_zero, 0, BITMAP_SIZE - max_non_zero);
maxval = reverse_lut(td->bitmap, td->lut);
ret = huf_uncompress(&gb, tmp, dsize / sizeof(int16_t));
if (ret)
return ret;
ptr = tmp;
for (i = 0; i < s->nb_channels; i++) {
EXRChannel *channel = &s->channels[i];
int size = channel->pixel_type;
for (j = 0; j < size; j++)
wav_decode(ptr + j, s->xdelta, size, s->ysize, s->xdelta * size, maxval);
ptr += s->xdelta * s->ysize * size;
}
apply_lut(td->lut, tmp, dsize / sizeof(int16_t));
out = td->uncompressed_data;
for (i = 0; i < s->ysize; i++) {
for (j = 0; j < s->nb_channels; j++) {
uint16_t *in = tmp + j * s->xdelta * s->ysize + i * s->xdelta;
memcpy(out, in, s->xdelta * 2);
out += s->xdelta * 2;
}
}
return 0;
}
static int pxr24_uncompress(EXRContext *s, const uint8_t *src,
int compressed_size, int uncompressed_size,
EXRThreadData *td)
@ -385,6 +844,9 @@ static int decode_block(AVCodecContext *avctx, void *tdata,
case EXR_ZIP16:
ret = zip_uncompress(src, data_size, uncompressed_size, td);
break;
case EXR_PIZ:
ret = piz_uncompress(s, src, data_size, uncompressed_size, td);
break;
case EXR_PXR24:
ret = pxr24_uncompress(s, src, data_size, uncompressed_size, td);
break;
@ -714,6 +1176,9 @@ static int decode_frame(AVCodecContext *avctx,
case EXR_ZIP16:
s->scan_lines_per_block = 16;
break;
case EXR_PIZ:
s->scan_lines_per_block = 32;
break;
default:
avpriv_report_missing_feature(avctx, "Compression %d", s->compr);
return AVERROR_PATCHWELCOME;
@ -793,6 +1258,8 @@ static av_cold int decode_end(AVCodecContext *avctx)
EXRThreadData *td = &s->thread_data[i];
av_free(td->uncompressed_data);
av_free(td->tmp);
av_free(td->bitmap);
av_free(td->lut);
}
av_freep(&s->thread_data);