WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/libavcodec/exr.c

Rev	Author	Line No.	Line
4349	Serge	1	/*
		2	* OpenEXR (.exr) image decoder
		3	* Copyright (c) 2009 Jimmy Christensen
		4	*
		5	* This file is part of FFmpeg.
		6	*
		7	* FFmpeg is free software; you can redistribute it and/or
		8	* modify it under the terms of the GNU Lesser General Public
		9	* License as published by the Free Software Foundation; either
		10	* version 2.1 of the License, or (at your option) any later version.
		11	*
		12	* FFmpeg is distributed in the hope that it will be useful,
		13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		15	* Lesser General Public License for more details.
		16	*
		17	* You should have received a copy of the GNU Lesser General Public
		18	* License along with FFmpeg; if not, write to the Free Software
		19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
		20	*/
		21
		22	/**
		23	* @file
		24	* OpenEXR decoder
		25	* @author Jimmy Christensen
		26	*
		27	* For more information on the OpenEXR format, visit:
		28	* http://openexr.com/
		29	*
		30	* exr_flt2uint() and exr_halflt2uint() is credited to Reimar Döffinger
		31	*/
		32
		33	#include
		34
		35	#include "get_bits.h"
		36	#include "avcodec.h"
		37	#include "bytestream.h"
		38	#include "mathops.h"
		39	#include "thread.h"
		40	#include "libavutil/imgutils.h"
		41	#include "libavutil/avassert.h"
		42
		43	enum ExrCompr {
		44	EXR_RAW = 0,
		45	EXR_RLE = 1,
		46	EXR_ZIP1 = 2,
		47	EXR_ZIP16 = 3,
		48	EXR_PIZ = 4,
		49	EXR_PXR24 = 5,
		50	EXR_B44 = 6,
		51	EXR_B44A = 7,
		52	};
		53
		54	enum ExrPixelType {
		55	EXR_UINT,
		56	EXR_HALF,
		57	EXR_FLOAT
		58	};
		59
		60	typedef struct EXRChannel {
		61	int xsub, ysub;
		62	enum ExrPixelType pixel_type;
		63	} EXRChannel;
		64
		65	typedef struct EXRThreadData {
		66	uint8_t *uncompressed_data;
		67	int uncompressed_size;
		68
		69	uint8_t *tmp;
		70	int tmp_size;
		71
		72	uint8_t *bitmap;
		73	uint16_t *lut;
		74	} EXRThreadData;
		75
		76	typedef struct EXRContext {
		77	AVFrame *picture;
		78	int compr;
		79	enum ExrPixelType pixel_type;
		80	int channel_offsets[4]; // 0 = red, 1 = green, 2 = blue and 3 = alpha
		81	const AVPixFmtDescriptor *desc;
		82
		83	uint32_t xmax, xmin;
		84	uint32_t ymax, ymin;
		85	uint32_t xdelta, ydelta;
		86
		87	int ysize;
		88
		89	uint64_t scan_line_size;
		90	int scan_lines_per_block;
		91
		92	const uint8_t buf, table;
		93	int buf_size;
		94
		95	EXRChannel *channels;
		96	int nb_channels;
		97
		98	EXRThreadData *thread_data;
		99	int thread_data_size;
		100	} EXRContext;
		101
		102	/**
		103	* Converts from 32-bit float as uint32_t to uint16_t
		104	*
		105	* @param v 32-bit float
		106	* @return normalized 16-bit unsigned int
		107	*/
		108	static inline uint16_t exr_flt2uint(uint32_t v)
		109	{
		110	unsigned int exp = v >> 23;
		111	// "HACK": negative values result in exp< 0, so clipping them to 0
		112	// is also handled by this condition, avoids explicit check for sign bit.
		113	if (exp<= 127 + 7 - 24) // we would shift out all bits anyway
		114	return 0;
		115	if (exp >= 127)
		116	return 0xffff;
		117	v &= 0x007fffff;
		118	return (v + (1 << 23)) >> (127 + 7 - exp);
		119	}
		120
		121	/**
		122	* Converts from 16-bit float as uint16_t to uint16_t
		123	*
		124	* @param v 16-bit float
		125	* @return normalized 16-bit unsigned int
		126	*/
		127	static inline uint16_t exr_halflt2uint(uint16_t v)
		128	{
		129	unsigned exp = 14 - (v >> 10);
		130	if (exp >= 14) {
		131	if (exp == 14) return (v >> 9) & 1;
		132	else return (v & 0x8000) ? 0 : 0xffff;
		133	}
		134	v <<= 6;
		135	return (v + (1 << 16)) >> (exp + 1);
		136	}
		137
		138	/**
		139	* Gets the size of the header variable
		140	*
		141	* @param **buf the current pointer location in the header where
		142	* the variable data starts
		143	* @param *buf_end pointer location of the end of the buffer
		144	* @return size of variable data
		145	*/
		146	static unsigned int get_header_variable_length(const uint8_t **buf,
		147	const uint8_t *buf_end)
		148	{
		149	unsigned int variable_buffer_data_size = bytestream_get_le32(buf);
		150	if (variable_buffer_data_size >= buf_end - *buf)
		151	return 0;
		152	return variable_buffer_data_size;
		153	}
		154
		155	/**
		156	* Checks if the variable name corresponds with it's data type
		157	*
		158	* @param *avctx the AVCodecContext
		159	* @param **buf the current pointer location in the header where
		160	* the variable name starts
		161	* @param *buf_end pointer location of the end of the buffer
		162	* @param *value_name name of the varible to check
		163	* @param *value_type type of the varible to check
		164	* @param minimum_length minimum length of the variable data
		165	* @param variable_buffer_data_size variable length read from the header
		166	* after it's checked
		167	* @return negative if variable is invalid
		168	*/
		169	static int check_header_variable(AVCodecContext *avctx,
		170	const uint8_t **buf,
		171	const uint8_t *buf_end,
		172	const char *value_name,
		173	const char *value_type,
		174	unsigned int minimum_length,
		175	unsigned int *variable_buffer_data_size)
		176	{
		177	if (buf_end - buf >= minimum_length && !strcmp(buf, value_name)) {
		178	*buf += strlen(value_name)+1;
		179	if (!strcmp(*buf, value_type)) {
		180	*buf += strlen(value_type)+1;
		181	*variable_buffer_data_size = get_header_variable_length(buf, buf_end);
		182	if (!*variable_buffer_data_size)
		183	av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
		184	return 1;
		185	}
		186	*buf -= strlen(value_name)+1;
		187	av_log(avctx, AV_LOG_WARNING, "Unknown data type for header variable %s\n", value_name);
		188	}
		189	return -1;
		190	}
		191
		192	static void predictor(uint8_t *src, int size)
		193	{
		194	uint8_t *t = src + 1;
		195	uint8_t *stop = src + size;
		196
		197	while (t < stop) {
		198	int d = (int)t[-1] + (int)t[0] - 128;
		199	t[0] = d;
		200	++t;
		201	}
		202	}
		203
		204	static void reorder_pixels(uint8_t src, uint8_t dst, int size)
		205	{
		206	const int8_t *t1 = src;
		207	const int8_t *t2 = src + (size + 1) / 2;
		208	int8_t *s = dst;
		209	int8_t *stop = s + size;
		210
		211	while (1) {
		212	if (s < stop)
		213	(s++) = (t1++);
		214	else
		215	break;
		216
		217	if (s < stop)
		218	(s++) = (t2++);
		219	else
		220	break;
		221	}
		222	}
		223
		224	static int zip_uncompress(const uint8_t *src, int compressed_size,
		225	int uncompressed_size, EXRThreadData *td)
		226	{
		227	unsigned long dest_len = uncompressed_size;
		228
		229	if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK \|\|
		230	dest_len != uncompressed_size)
		231	return AVERROR(EINVAL);
		232
		233	predictor(td->tmp, uncompressed_size);
		234	reorder_pixels(td->tmp, td->uncompressed_data, uncompressed_size);
		235
		236	return 0;
		237	}
		238
		239	static int rle_uncompress(const uint8_t *src, int compressed_size,
		240	int uncompressed_size, EXRThreadData *td)
		241	{
		242	int8_t d = (int8_t )td->tmp;
		243	const int8_t s = (const int8_t )src;
		244	int ssize = compressed_size;
		245	int dsize = uncompressed_size;
		246	int8_t *dend = d + dsize;
		247	int count;
		248
		249	while (ssize > 0) {
		250	count = *s++;
		251
		252	if (count < 0) {
		253	count = -count;
		254
		255	if ((dsize -= count ) < 0 \|\|
		256	(ssize -= count + 1) < 0)
		257	return -1;
		258
		259	while (count--)
		260	d++ = s++;
		261	} else {
		262	count++;
		263
		264	if ((dsize -= count) < 0 \|\|
		265	(ssize -= 2 ) < 0)
		266	return -1;
		267
		268	while (count--)
		269	d++ = s;
		270
		271	s++;
		272	}
		273	}
		274
		275	if (dend != d)
		276	return AVERROR_INVALIDDATA;
		277
		278	predictor(td->tmp, uncompressed_size);
		279	reorder_pixels(td->tmp, td->uncompressed_data, uncompressed_size);
		280
		281	return 0;
		282	}
		283
		284	#define USHORT_RANGE (1 << 16)
		285	#define BITMAP_SIZE (1 << 13)
		286
		287	static uint16_t reverse_lut(const uint8_t bitmap, uint16_t lut)
		288	{
		289	int i, k = 0;
		290
		291	for (i = 0; i < USHORT_RANGE; i++) {
		292	if ((i == 0) \|\| (bitmap[i >> 3] & (1 << (i & 7))))
		293	lut[k++] = i;
		294	}
		295
		296	i = k - 1;
		297
		298	memset(lut + k, 0, (USHORT_RANGE - k) * 2);
		299
		300	return i;
		301	}
		302
		303	static void apply_lut(const uint16_t lut, uint16_t dst, int dsize)
		304	{
		305	int i;
		306
		307	for (i = 0; i < dsize; ++i)
		308	dst[i] = lut[dst[i]];
		309	}
		310
		311	#define HUF_ENCBITS 16 // literal (value) bit length
		312	#define HUF_DECBITS 14 // decoding bit size (>= 8)
		313
		314	#define HUF_ENCSIZE ((1 << HUF_ENCBITS) + 1) // encoding table size
		315	#define HUF_DECSIZE (1 << HUF_DECBITS) // decoding table size
		316	#define HUF_DECMASK (HUF_DECSIZE - 1)
		317
		318	typedef struct HufDec {
		319	int len;
		320	int lit;
		321	int *p;
		322	} HufDec;
		323
		324	static void huf_canonical_code_table(uint64_t *hcode)
		325	{
		326	uint64_t c, n[59] = { 0 };
		327	int i;
		328
		329	for (i = 0; i < HUF_ENCSIZE; ++i)
		330	n[hcode[i]] += 1;
		331
		332	c = 0;
		333	for (i = 58; i > 0; --i) {
		334	uint64_t nc = ((c + n[i]) >> 1);
		335	n[i] = c;
		336	c = nc;
		337	}
		338
		339	for (i = 0; i < HUF_ENCSIZE; ++i) {
		340	int l = hcode[i];
		341
		342	if (l > 0)
		343	hcode[i] = l \| (n[l]++ << 6);
		344	}
		345	}
		346
		347	#define SHORT_ZEROCODE_RUN 59
		348	#define LONG_ZEROCODE_RUN 63
		349	#define SHORTEST_LONG_RUN (2 + LONG_ZEROCODE_RUN - SHORT_ZEROCODE_RUN)
		350	#define LONGEST_LONG_RUN (255 + SHORTEST_LONG_RUN)
		351
		352	static int huf_unpack_enc_table(GetByteContext *gb,
		353	int32_t im, int32_t iM, uint64_t *hcode)
		354	{
		355	GetBitContext gbit;
		356
		357	init_get_bits8(&gbit, gb->buffer, bytestream2_get_bytes_left(gb));
		358
		359	for (; im <= iM; im++) {
		360	uint64_t l = hcode[im] = get_bits(&gbit, 6);
		361
		362	if (l == LONG_ZEROCODE_RUN) {
		363	int zerun = get_bits(&gbit, 8) + SHORTEST_LONG_RUN;
		364
		365	if (im + zerun > iM + 1)
		366	return AVERROR_INVALIDDATA;
		367
		368	while (zerun--)
		369	hcode[im++] = 0;
		370
		371	im--;
		372	} else if (l >= (uint64_t) SHORT_ZEROCODE_RUN) {
		373	int zerun = l - SHORT_ZEROCODE_RUN + 2;
		374
		375	if (im + zerun > iM + 1)
		376	return AVERROR_INVALIDDATA;
		377
		378	while (zerun--)
		379	hcode[im++] = 0;
		380
		381	im--;
		382	}
		383	}
		384
		385	bytestream2_skip(gb, (get_bits_count(&gbit) + 7) / 8);
		386	huf_canonical_code_table(hcode);
		387
		388	return 0;
		389	}
		390
		391	static int huf_build_dec_table(const uint64_t *hcode, int im,
		392	int iM, HufDec *hdecod)
		393	{
		394	for (; im <= iM; im++) {
		395	uint64_t c = hcode[im] >> 6;
		396	int i, l = hcode[im] & 63;
		397
		398	if (c >> l)
		399	return AVERROR_INVALIDDATA;
		400
		401	if (l > HUF_DECBITS) {
		402	HufDec *pl = hdecod + (c >> (l - HUF_DECBITS));
		403	if (pl->len)
		404	return AVERROR_INVALIDDATA;
		405
		406	pl->lit++;
		407
		408	pl->p = av_realloc_f(pl->p, pl->lit, sizeof(int));
		409	if (!pl->p)
		410	return AVERROR(ENOMEM);
		411
		412	pl->p[pl->lit - 1] = im;
		413	} else if (l) {
		414	HufDec *pl = hdecod + (c << (HUF_DECBITS - l));
		415
		416	for (i = 1 << (HUF_DECBITS - l); i > 0; i--, pl++) {
		417	if (pl->len \|\| pl->p)
		418	return AVERROR_INVALIDDATA;
		419	pl->len = l;
		420	pl->lit = im;
		421	}
		422	}
		423	}
		424
		425	return 0;
		426	}
		427
		428	#define get_char(c, lc, gb) { \
		429	c = (c << 8) \| bytestream2_get_byte(gb); \
		430	lc += 8; \
		431	}
		432
		433	#define get_code(po, rlc, c, lc, gb, out, oe) { \
		434	if (po == rlc) { \
		435	if (lc < 8) \
		436	get_char(c, lc, gb); \
		437	lc -= 8; \
		438	\
		439	cs = c >> lc; \
		440	\
		441	if (out + cs > oe) \
		442	return AVERROR_INVALIDDATA; \
		443	\
		444	s = out[-1]; \
		445	\
		446	while (cs-- > 0) \
		447	*out++ = s; \
		448	} else if (out < oe) { \
		449	*out++ = po; \
		450	} else { \
		451	return AVERROR_INVALIDDATA; \
		452	} \
		453	}
		454
		455	static int huf_decode(const uint64_t hcode, const HufDec hdecod,
		456	GetByteContext *gb, int nbits,
		457	int rlc, int no, uint16_t *out)
		458	{
		459	uint64_t c = 0;
		460	uint16_t *outb = out;
		461	uint16_t *oe = out + no;
		462	const uint8_t *ie = gb->buffer + (nbits + 7) / 8; // input byte size
		463	uint8_t cs, s;
		464	int i, lc = 0;
		465
		466	while (gb->buffer < ie) {
		467	get_char(c, lc, gb);
		468
		469	while (lc >= HUF_DECBITS) {
		470	const HufDec pl = hdecod[(c >> (lc-HUF_DECBITS)) & HUF_DECMASK];
		471
		472	if (pl.len) {
		473	lc -= pl.len;
		474	get_code(pl.lit, rlc, c, lc, gb, out, oe);
		475	} else {
		476	int j;
		477
		478	if (!pl.p)
		479	return AVERROR_INVALIDDATA;
		480
		481	for (j = 0; j < pl.lit; j++) {
		482	int l = hcode[pl.p[j]] & 63;
		483
		484	while (lc < l && bytestream2_get_bytes_left(gb) > 0)
		485	get_char(c, lc, gb);
		486
		487	if (lc >= l) {
		488	if ((hcode[pl.p[j]] >> 6) ==
		489	((c >> (lc - l)) & ((1LL << l) - 1))) {
		490	lc -= l;
		491	get_code(pl.p[j], rlc, c, lc, gb, out, oe);
		492	break;
		493	}
		494	}
		495	}
		496
		497	if (j == pl.lit)
		498	return AVERROR_INVALIDDATA;
		499	}
		500	}
		501	}
		502
		503	i = (8 - nbits) & 7;
		504	c >>= i;
		505	lc -= i;
		506
		507	while (lc > 0) {
		508	const HufDec pl = hdecod[(c << (HUF_DECBITS - lc)) & HUF_DECMASK];
		509
		510	if (pl.len) {
		511	lc -= pl.len;
		512	get_code(pl.lit, rlc, c, lc, gb, out, oe);
		513	} else {
		514	return AVERROR_INVALIDDATA;
		515	}
		516	}
		517
		518	if (out - outb != no)
		519	return AVERROR_INVALIDDATA;
		520	return 0;
		521	}
		522
		523	static int huf_uncompress(GetByteContext *gb,
		524	uint16_t *dst, int dst_size)
		525	{
		526	int32_t src_size, im, iM;
		527	uint32_t nBits;
		528	uint64_t *freq;
		529	HufDec *hdec;
		530	int ret, i;
		531
		532	src_size = bytestream2_get_le32(gb);
		533	im = bytestream2_get_le32(gb);
		534	iM = bytestream2_get_le32(gb);
		535	bytestream2_skip(gb, 4);
		536	nBits = bytestream2_get_le32(gb);
		537	if (im < 0 \|\| im >= HUF_ENCSIZE \|\|
		538	iM < 0 \|\| iM >= HUF_ENCSIZE \|\|
		539	src_size < 0)
		540	return AVERROR_INVALIDDATA;
		541
		542	bytestream2_skip(gb, 4);
		543
		544	freq = av_calloc(HUF_ENCSIZE, sizeof(*freq));
		545	hdec = av_calloc(HUF_DECSIZE, sizeof(*hdec));
		546	if (!freq \|\| !hdec) {
		547	ret = AVERROR(ENOMEM);
		548	goto fail;
		549	}
		550
		551	if ((ret = huf_unpack_enc_table(gb, im, iM, freq)) < 0)
		552	goto fail;
		553
		554	if (nBits > 8 * bytestream2_get_bytes_left(gb)) {
		555	ret = AVERROR_INVALIDDATA;
		556	goto fail;
		557	}
		558
		559	if ((ret = huf_build_dec_table(freq, im, iM, hdec)) < 0)
		560	goto fail;
		561	ret = huf_decode(freq, hdec, gb, nBits, iM, dst_size, dst);
		562
		563	fail:
		564	for (i = 0; i < HUF_DECSIZE; i++) {
		565	if (hdec)
		566	av_freep(&hdec[i].p);
		567	}
		568
		569	av_free(freq);
		570	av_free(hdec);
		571
		572	return ret;
		573	}
		574
		575	static inline void wdec14(uint16_t l, uint16_t h, uint16_t a, uint16_t b)
		576	{
		577	int16_t ls = l;
		578	int16_t hs = h;
		579	int hi = hs;
		580	int ai = ls + (hi & 1) + (hi >> 1);
		581	int16_t as = ai;
		582	int16_t bs = ai - hi;
		583
		584	*a = as;
		585	*b = bs;
		586	}
		587
		588	#define NBITS 16
		589	#define A_OFFSET (1 << (NBITS - 1))
		590	#define MOD_MASK ((1 << NBITS) - 1)
		591
		592	static inline void wdec16(uint16_t l, uint16_t h, uint16_t a, uint16_t b)
		593	{
		594	int m = l;
		595	int d = h;
		596	int bb = (m - (d >> 1)) & MOD_MASK;
		597	int aa = (d + bb - A_OFFSET) & MOD_MASK;
		598	*b = bb;
		599	*a = aa;
		600	}
		601
		602	static void wav_decode(uint16_t *in, int nx, int ox,
		603	int ny, int oy, uint16_t mx)
		604	{
		605	int w14 = (mx < (1 << 14));
		606	int n = (nx > ny) ? ny: nx;
		607	int p = 1;
		608	int p2;
		609
		610	while (p <= n)
		611	p <<= 1;
		612
		613	p >>= 1;
		614	p2 = p;
		615	p >>= 1;
		616
		617	while (p >= 1) {
		618	uint16_t *py = in;
		619	uint16_t ey = in + oy (ny - p2);
		620	uint16_t i00, i01, i10, i11;
		621	int oy1 = oy * p;
		622	int oy2 = oy * p2;
		623	int ox1 = ox * p;
		624	int ox2 = ox * p2;
		625
		626	for (; py <= ey; py += oy2) {
		627	uint16_t *px = py;
		628	uint16_t ex = py + ox (nx - p2);
		629
		630	for (; px <= ex; px += ox2) {
		631	uint16_t *p01 = px + ox1;
		632	uint16_t *p10 = px + oy1;
		633	uint16_t *p11 = p10 + ox1;
		634
		635	if (w14) {
		636	wdec14(px, p10, &i00, &i10);
		637	wdec14(p01, p11, &i01, &i11);
		638	wdec14(i00, i01, px, p01);
		639	wdec14(i10, i11, p10, p11);
		640	} else {
		641	wdec16(px, p10, &i00, &i10);
		642	wdec16(p01, p11, &i01, &i11);
		643	wdec16(i00, i01, px, p01);
		644	wdec16(i10, i11, p10, p11);
		645	}
		646	}
		647
		648	if (nx & p) {
		649	uint16_t *p10 = px + oy1;
		650
		651	if (w14)
		652	wdec14(px, p10, &i00, p10);
		653	else
		654	wdec16(px, p10, &i00, p10);
		655
		656	*px = i00;
		657	}
		658	}
		659
		660	if (ny & p) {
		661	uint16_t *px = py;
		662	uint16_t ex = py + ox (nx - p2);
		663
		664	for (; px <= ex; px += ox2) {
		665	uint16_t *p01 = px + ox1;
		666
		667	if (w14)
		668	wdec14(px, p01, &i00, p01);
		669	else
		670	wdec16(px, p01, &i00, p01);
		671
		672	*px = i00;
		673	}
		674	}
		675
		676	p2 = p;
		677	p >>= 1;
		678	}
		679	}
		680
		681	static int piz_uncompress(EXRContext s, const uint8_t src, int ssize, int dsize, EXRThreadData *td)
		682	{
		683	GetByteContext gb;
		684	uint16_t maxval, min_non_zero, max_non_zero;
		685	uint16_t ptr, tmp = (uint16_t *)td->tmp;
		686	int8_t *out;
		687	int ret, i, j;
		688
		689	if (!td->bitmap)
		690	td->bitmap = av_malloc(BITMAP_SIZE);
		691	if (!td->lut)
		692	td->lut = av_malloc(1 << 17);
		693	if (!td->bitmap \|\| !td->lut)
		694	return AVERROR(ENOMEM);
		695
		696	bytestream2_init(&gb, src, ssize);
		697	min_non_zero = bytestream2_get_le16(&gb);
		698	max_non_zero = bytestream2_get_le16(&gb);
		699
		700	if (max_non_zero >= BITMAP_SIZE)
		701	return AVERROR_INVALIDDATA;
		702
		703	memset(td->bitmap, 0, FFMIN(min_non_zero, BITMAP_SIZE));
		704	if (min_non_zero <= max_non_zero)
		705	bytestream2_get_buffer(&gb, td->bitmap + min_non_zero,
		706	max_non_zero - min_non_zero + 1);
		707	memset(td->bitmap + max_non_zero, 0, BITMAP_SIZE - max_non_zero);
		708
		709	maxval = reverse_lut(td->bitmap, td->lut);
		710
		711	ret = huf_uncompress(&gb, tmp, dsize / sizeof(int16_t));
		712	if (ret)
		713	return ret;
		714
		715	ptr = tmp;
		716	for (i = 0; i < s->nb_channels; i++) {
		717	EXRChannel *channel = &s->channels[i];
		718	int size = channel->pixel_type;
		719
		720	for (j = 0; j < size; j++)
		721	wav_decode(ptr + j, s->xdelta, size, s->ysize, s->xdelta * size, maxval);
		722	ptr += s->xdelta * s->ysize * size;
		723	}
		724
		725	apply_lut(td->lut, tmp, dsize / sizeof(int16_t));
		726
		727	out = td->uncompressed_data;
		728	for (i = 0; i < s->ysize; i++) {
		729	for (j = 0; j < s->nb_channels; j++) {
		730	uint16_t in = tmp + j s->xdelta * s->ysize + i * s->xdelta;
		731	memcpy(out, in, s->xdelta * 2);
		732	out += s->xdelta * 2;
		733	}
		734	}
		735
		736	return 0;
		737	}
		738
		739	static int pxr24_uncompress(EXRContext s, const uint8_t src,
		740	int compressed_size, int uncompressed_size,
		741	EXRThreadData *td)
		742	{
		743	unsigned long dest_len = uncompressed_size;
		744	const uint8_t *in = td->tmp;
		745	uint8_t *out;
		746	int c, i, j;
		747
		748	if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK \|\|
		749	dest_len != uncompressed_size)
		750	return AVERROR(EINVAL);
		751
		752	out = td->uncompressed_data;
		753	for (i = 0; i < s->ysize; i++) {
		754	for (c = 0; c < s->nb_channels; c++) {
		755	EXRChannel *channel = &s->channels[c];
		756	const uint8_t *ptr[4];
		757	uint32_t pixel = 0;
		758
		759	switch (channel->pixel_type) {
		760	case EXR_FLOAT:
		761	ptr[0] = in;
		762	ptr[1] = ptr[0] + s->xdelta;
		763	ptr[2] = ptr[1] + s->xdelta;
		764	in = ptr[2] + s->xdelta;
		765
		766	for (j = 0; j < s->xdelta; ++j) {
		767	uint32_t diff = (*(ptr[0]++) << 24) \|
		768	(*(ptr[1]++) << 16) \|
		769	(*(ptr[2]++) << 8);
		770	pixel += diff;
		771	bytestream_put_le32(&out, pixel);
		772	}
		773	break;
		774	case EXR_HALF:
		775	ptr[0] = in;
		776	ptr[1] = ptr[0] + s->xdelta;
		777	in = ptr[1] + s->xdelta;
		778	for (j = 0; j < s->xdelta; j++) {
		779	uint32_t diff = ((ptr[0]++) << 8) \| (ptr[1]++);
		780
		781	pixel += diff;
		782	bytestream_put_le16(&out, pixel);
		783	}
		784	break;
		785	default:
		786	av_assert1(0);
		787	}
		788	}
		789	}
		790
		791	return 0;
		792	}
		793
		794	static int decode_block(AVCodecContext avctx, void tdata,
		795	int jobnr, int threadnr)
		796	{
		797	EXRContext *s = avctx->priv_data;
		798	AVFrame *const p = s->picture;
		799	EXRThreadData *td = &s->thread_data[threadnr];
		800	const uint8_t *channel_buffer[4] = { 0 };
		801	const uint8_t *buf = s->buf;
		802	uint64_t line_offset, uncompressed_size;
		803	uint32_t xdelta = s->xdelta;
		804	uint16_t *ptr_x;
		805	uint8_t *ptr;
		806	int32_t data_size, line;
		807	const uint8_t *src;
		808	int axmax = (avctx->width - (s->xmax + 1)) * 2 * s->desc->nb_components;
		809	int bxmin = s->xmin * 2 * s->desc->nb_components;
		810	int i, x, buf_size = s->buf_size;
		811	int av_unused ret;
		812
		813	line_offset = AV_RL64(s->table + jobnr * 8);
		814	// Check if the buffer has the required bytes needed from the offset
		815	if (line_offset > buf_size - 8)
		816	return AVERROR_INVALIDDATA;
		817
		818	src = buf + line_offset + 8;
		819	line = AV_RL32(src - 8);
		820	if (line < s->ymin \|\| line > s->ymax)
		821	return AVERROR_INVALIDDATA;
		822
		823	data_size = AV_RL32(src - 4);
		824	if (data_size <= 0 \|\| data_size > buf_size)
		825	return AVERROR_INVALIDDATA;
		826
		827	s->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1);
		828	uncompressed_size = s->scan_line_size * s->ysize;
		829	if ((s->compr == EXR_RAW && (data_size != uncompressed_size \|\|
		830	line_offset > buf_size - uncompressed_size)) \|\|
		831	(s->compr != EXR_RAW && (data_size > uncompressed_size \|\|
		832	line_offset > buf_size - data_size))) {
		833	return AVERROR_INVALIDDATA;
		834	}
		835
		836	if (data_size < uncompressed_size) {
		837	av_fast_padded_malloc(&td->uncompressed_data, &td->uncompressed_size, uncompressed_size);
		838	av_fast_padded_malloc(&td->tmp, &td->tmp_size, uncompressed_size);
		839	if (!td->uncompressed_data \|\| !td->tmp)
		840	return AVERROR(ENOMEM);
		841
		842	switch (s->compr) {
		843	case EXR_ZIP1:
		844	case EXR_ZIP16:
		845	ret = zip_uncompress(src, data_size, uncompressed_size, td);
		846	break;
		847	case EXR_PIZ:
		848	ret = piz_uncompress(s, src, data_size, uncompressed_size, td);
		849	break;
		850	case EXR_PXR24:
		851	ret = pxr24_uncompress(s, src, data_size, uncompressed_size, td);
		852	break;
		853	case EXR_RLE:
		854	ret = rle_uncompress(src, data_size, uncompressed_size, td);
		855	}
		856
		857	src = td->uncompressed_data;
		858	}
		859
		860	channel_buffer[0] = src + xdelta * s->channel_offsets[0];
		861	channel_buffer[1] = src + xdelta * s->channel_offsets[1];
		862	channel_buffer[2] = src + xdelta * s->channel_offsets[2];
		863	if (s->channel_offsets[3] >= 0)
		864	channel_buffer[3] = src + xdelta * s->channel_offsets[3];
		865
		866	ptr = p->data[0] + line * p->linesize[0];
		867	for (i = 0; i < s->scan_lines_per_block && line + i <= s->ymax; i++, ptr += p->linesize[0]) {
		868	const uint8_t r, g, b, a;
		869
		870	r = channel_buffer[0];
		871	g = channel_buffer[1];
		872	b = channel_buffer[2];
		873	if (channel_buffer[3])
		874	a = channel_buffer[3];
		875
		876	ptr_x = (uint16_t *)ptr;
		877
		878	// Zero out the start if xmin is not 0
		879	memset(ptr_x, 0, bxmin);
		880	ptr_x += s->xmin * s->desc->nb_components;
		881	if (s->pixel_type == EXR_FLOAT) {
		882	// 32-bit
		883	for (x = 0; x < xdelta; x++) {
		884	*ptr_x++ = exr_flt2uint(bytestream_get_le32(&r));
		885	*ptr_x++ = exr_flt2uint(bytestream_get_le32(&g));
		886	*ptr_x++ = exr_flt2uint(bytestream_get_le32(&b));
		887	if (channel_buffer[3])
		888	*ptr_x++ = exr_flt2uint(bytestream_get_le32(&a));
		889	}
		890	} else {
		891	// 16-bit
		892	for (x = 0; x < xdelta; x++) {
		893	*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&r));
		894	*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&g));
		895	*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&b));
		896	if (channel_buffer[3])
		897	*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&a));
		898	}
		899	}
		900
		901	// Zero out the end if xmax+1 is not w
		902	memset(ptr_x, 0, axmax);
		903
		904	channel_buffer[0] += s->scan_line_size;
		905	channel_buffer[1] += s->scan_line_size;
		906	channel_buffer[2] += s->scan_line_size;
		907	if (channel_buffer[3])
		908	channel_buffer[3] += s->scan_line_size;
		909	}
		910
		911	return 0;
		912	}
		913
		914	static int decode_frame(AVCodecContext *avctx,
		915	void *data,
		916	int *got_frame,
		917	AVPacket *avpkt)
		918	{
		919	const uint8_t *buf = avpkt->data;
		920	unsigned int buf_size = avpkt->size;
		921	const uint8_t *buf_end = buf + buf_size;
		922
		923	EXRContext *const s = avctx->priv_data;
		924	ThreadFrame frame = { .f = data };
		925	AVFrame *picture = data;
		926	uint8_t *ptr;
		927
		928	int i, y, magic_number, version, flags, ret;
		929	int w = 0;
		930	int h = 0;
		931
		932	int out_line_size;
		933	int scan_line_blocks;
		934
		935	unsigned int current_channel_offset = 0;
		936
		937	s->xmin = ~0;
		938	s->xmax = ~0;
		939	s->ymin = ~0;
		940	s->ymax = ~0;
		941	s->xdelta = ~0;
		942	s->ydelta = ~0;
		943	s->channel_offsets[0] = -1;
		944	s->channel_offsets[1] = -1;
		945	s->channel_offsets[2] = -1;
		946	s->channel_offsets[3] = -1;
		947	s->pixel_type = -1;
		948	s->nb_channels = 0;
		949	s->compr = -1;
		950	s->buf = buf;
		951	s->buf_size = buf_size;
		952
		953	if (buf_size < 10) {
		954	av_log(avctx, AV_LOG_ERROR, "Too short header to parse\n");
		955	return AVERROR_INVALIDDATA;
		956	}
		957
		958	magic_number = bytestream_get_le32(&buf);
		959	if (magic_number != 20000630) { // As per documentation of OpenEXR it's supposed to be int 20000630 little-endian
		960	av_log(avctx, AV_LOG_ERROR, "Wrong magic number %d\n", magic_number);
		961	return AVERROR_INVALIDDATA;
		962	}
		963
		964	version = bytestream_get_byte(&buf);
		965	if (version != 2) {
		966	avpriv_report_missing_feature(avctx, "Version %d", version);
		967	return AVERROR_PATCHWELCOME;
		968	}
		969
		970	flags = bytestream_get_le24(&buf);
		971	if (flags & 0x2) {
		972	avpriv_report_missing_feature(avctx, "Tile support");
		973	return AVERROR_PATCHWELCOME;
		974	}
		975
		976	// Parse the header
		977	while (buf < buf_end && buf[0]) {
		978	unsigned int variable_buffer_data_size;
		979	// Process the channel list
		980	if (check_header_variable(avctx, &buf, buf_end, "channels", "chlist", 38, &variable_buffer_data_size) >= 0) {
		981	const uint8_t *channel_list_end;
		982	if (!variable_buffer_data_size)
		983	return AVERROR_INVALIDDATA;
		984
		985	channel_list_end = buf + variable_buffer_data_size;
		986	while (channel_list_end - buf >= 19) {
		987	EXRChannel *channel;
		988	enum ExrPixelType current_pixel_type;
		989	int channel_index = -1;
		990	int xsub, ysub;
		991
		992	if (!strcmp(buf, "R"))
		993	channel_index = 0;
		994	else if (!strcmp(buf, "G"))
		995	channel_index = 1;
		996	else if (!strcmp(buf, "B"))
		997	channel_index = 2;
		998	else if (!strcmp(buf, "A"))
		999	channel_index = 3;
		1000	else
		1001	av_log(avctx, AV_LOG_WARNING, "Unsupported channel %.256s\n", buf);
		1002
		1003	while (bytestream_get_byte(&buf) && buf < channel_list_end)
		1004	continue; /* skip */
		1005
		1006	if (channel_list_end - * &buf < 4) {
		1007	av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
		1008	return AVERROR_INVALIDDATA;
		1009	}
		1010
		1011	current_pixel_type = bytestream_get_le32(&buf);
		1012	if (current_pixel_type > 2) {
		1013	av_log(avctx, AV_LOG_ERROR, "Unknown pixel type\n");
		1014	return AVERROR_INVALIDDATA;
		1015	}
		1016
		1017	buf += 4;
		1018	xsub = bytestream_get_le32(&buf);
		1019	ysub = bytestream_get_le32(&buf);
		1020	if (xsub != 1 \|\| ysub != 1) {
		1021	avpriv_report_missing_feature(avctx, "Subsampling %dx%d", xsub, ysub);
		1022	return AVERROR_PATCHWELCOME;
		1023	}
		1024
		1025	if (channel_index >= 0) {
		1026	if (s->pixel_type != -1 && s->pixel_type != current_pixel_type) {
		1027	av_log(avctx, AV_LOG_ERROR, "RGB channels not of the same depth\n");
		1028	return AVERROR_INVALIDDATA;
		1029	}
		1030	s->pixel_type = current_pixel_type;
		1031	s->channel_offsets[channel_index] = current_channel_offset;
		1032	}
		1033
		1034	s->channels = av_realloc_f(s->channels, ++s->nb_channels, sizeof(EXRChannel));
		1035	if (!s->channels)
		1036	return AVERROR(ENOMEM);
		1037	channel = &s->channels[s->nb_channels - 1];
		1038	channel->pixel_type = current_pixel_type;
		1039	channel->xsub = xsub;
		1040	channel->ysub = ysub;
		1041
		1042	current_channel_offset += 1 << current_pixel_type;
		1043	}
		1044
		1045	/* Check if all channels are set with an offset or if the channels
		1046	* are causing an overflow */
		1047
		1048	if (FFMIN3(s->channel_offsets[0],
		1049	s->channel_offsets[1],
		1050	s->channel_offsets[2]) < 0) {
		1051	if (s->channel_offsets[0] < 0)
		1052	av_log(avctx, AV_LOG_ERROR, "Missing red channel\n");
		1053	if (s->channel_offsets[1] < 0)
		1054	av_log(avctx, AV_LOG_ERROR, "Missing green channel\n");
		1055	if (s->channel_offsets[2] < 0)
		1056	av_log(avctx, AV_LOG_ERROR, "Missing blue channel\n");
		1057	return AVERROR_INVALIDDATA;
		1058	}
		1059
		1060	buf = channel_list_end;
		1061	continue;
		1062	} else if (check_header_variable(avctx, &buf, buf_end, "dataWindow", "box2i", 31, &variable_buffer_data_size) >= 0) {
		1063	if (!variable_buffer_data_size)
		1064	return AVERROR_INVALIDDATA;
		1065
		1066	s->xmin = AV_RL32(buf);
		1067	s->ymin = AV_RL32(buf + 4);
		1068	s->xmax = AV_RL32(buf + 8);
		1069	s->ymax = AV_RL32(buf + 12);
		1070	s->xdelta = (s->xmax - s->xmin) + 1;
		1071	s->ydelta = (s->ymax - s->ymin) + 1;
		1072
		1073	buf += variable_buffer_data_size;
		1074	continue;
		1075	} else if (check_header_variable(avctx, &buf, buf_end, "displayWindow", "box2i", 34, &variable_buffer_data_size) >= 0) {
		1076	if (!variable_buffer_data_size)
		1077	return AVERROR_INVALIDDATA;
		1078
		1079	w = AV_RL32(buf + 8) + 1;
		1080	h = AV_RL32(buf + 12) + 1;
		1081
		1082	buf += variable_buffer_data_size;
		1083	continue;
		1084	} else if (check_header_variable(avctx, &buf, buf_end, "lineOrder", "lineOrder", 25, &variable_buffer_data_size) >= 0) {
		1085	if (!variable_buffer_data_size)
		1086	return AVERROR_INVALIDDATA;
		1087
		1088	av_log(avctx, AV_LOG_DEBUG, "line order : %d\n", *buf);
		1089	if (*buf > 2) {
		1090	av_log(avctx, AV_LOG_ERROR, "Unknown line order\n");
		1091	return AVERROR_INVALIDDATA;
		1092	}
		1093
		1094	buf += variable_buffer_data_size;
		1095	continue;
		1096	} else if (check_header_variable(avctx, &buf, buf_end, "pixelAspectRatio", "float", 31, &variable_buffer_data_size) >= 0) {
		1097	if (!variable_buffer_data_size)
		1098	return AVERROR_INVALIDDATA;
		1099
		1100	avctx->sample_aspect_ratio = av_d2q(av_int2float(AV_RL32(buf)), 255);
		1101
		1102	buf += variable_buffer_data_size;
		1103	continue;
		1104	} else if (check_header_variable(avctx, &buf, buf_end, "compression", "compression", 29, &variable_buffer_data_size) >= 0) {
		1105	if (!variable_buffer_data_size)
		1106	return AVERROR_INVALIDDATA;
		1107
		1108	if (s->compr == -1)
		1109	s->compr = *buf;
		1110	else
		1111	av_log(avctx, AV_LOG_WARNING, "Found more than one compression attribute\n");
		1112
		1113	buf += variable_buffer_data_size;
		1114	continue;
		1115	}
		1116
		1117	// Check if there is enough bytes for a header
		1118	if (buf_end - buf <= 9) {
		1119	av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
		1120	return AVERROR_INVALIDDATA;
		1121	}
		1122
		1123	// Process unknown variables
		1124	for (i = 0; i < 2; i++) {
		1125	// Skip variable name/type
		1126	while (++buf < buf_end)
		1127	if (buf[0] == 0x0)
		1128	break;
		1129	}
		1130	buf++;
		1131	// Skip variable length
		1132	if (buf_end - buf >= 5) {
		1133	variable_buffer_data_size = get_header_variable_length(&buf, buf_end);
		1134	if (!variable_buffer_data_size) {
		1135	av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
		1136	return AVERROR_INVALIDDATA;
		1137	}
		1138	buf += variable_buffer_data_size;
		1139	}
		1140	}
		1141
		1142	if (s->compr == -1) {
		1143	av_log(avctx, AV_LOG_ERROR, "Missing compression attribute\n");
		1144	return AVERROR_INVALIDDATA;
		1145	}
		1146
		1147	if (buf >= buf_end) {
		1148	av_log(avctx, AV_LOG_ERROR, "Incomplete frame\n");
		1149	return AVERROR_INVALIDDATA;
		1150	}
		1151	buf++;
		1152
		1153	switch (s->pixel_type) {
		1154	case EXR_FLOAT:
		1155	case EXR_HALF:
		1156	if (s->channel_offsets[3] >= 0)
		1157	avctx->pix_fmt = AV_PIX_FMT_RGBA64;
		1158	else
		1159	avctx->pix_fmt = AV_PIX_FMT_RGB48;
		1160	break;
		1161	case EXR_UINT:
		1162	avpriv_request_sample(avctx, "32-bit unsigned int");
		1163	return AVERROR_PATCHWELCOME;
		1164	default:
		1165	av_log(avctx, AV_LOG_ERROR, "Missing channel list\n");
		1166	return AVERROR_INVALIDDATA;
		1167	}
		1168
		1169	switch (s->compr) {
		1170	case EXR_RAW:
		1171	case EXR_RLE:
		1172	case EXR_ZIP1:
		1173	s->scan_lines_per_block = 1;
		1174	break;
		1175	case EXR_PXR24:
		1176	case EXR_ZIP16:
		1177	s->scan_lines_per_block = 16;
		1178	break;
		1179	case EXR_PIZ:
		1180	s->scan_lines_per_block = 32;
		1181	break;
		1182	default:
		1183	avpriv_report_missing_feature(avctx, "Compression %d", s->compr);
		1184	return AVERROR_PATCHWELCOME;
		1185	}
		1186
		1187	if (av_image_check_size(w, h, 0, avctx))
		1188	return AVERROR_INVALIDDATA;
		1189
		1190	// Verify the xmin, xmax, ymin, ymax and xdelta before setting the actual image size
		1191	if (s->xmin > s->xmax \|\|
		1192	s->ymin > s->ymax \|\|
		1193	s->xdelta != s->xmax - s->xmin + 1 \|\|
		1194	s->xmax >= w \|\| s->ymax >= h) {
		1195	av_log(avctx, AV_LOG_ERROR, "Wrong sizing or missing size information\n");
		1196	return AVERROR_INVALIDDATA;
		1197	}
		1198
		1199	if (w != avctx->width \|\| h != avctx->height) {
		1200	avcodec_set_dimensions(avctx, w, h);
		1201	}
		1202
		1203	s->desc = av_pix_fmt_desc_get(avctx->pix_fmt);
		1204	out_line_size = avctx->width * 2 * s->desc->nb_components;
		1205	s->scan_line_size = s->xdelta * current_channel_offset;
		1206	scan_line_blocks = (s->ydelta + s->scan_lines_per_block - 1) / s->scan_lines_per_block;
		1207
		1208	if (s->compr != EXR_RAW) {
		1209	size_t thread_data_size, prev_size;
		1210	EXRThreadData *m;
		1211
		1212	prev_size = s->thread_data_size;
		1213	if (av_size_mult(avctx->thread_count, sizeof(EXRThreadData), &thread_data_size))
		1214	return AVERROR(EINVAL);
		1215
		1216	m = av_fast_realloc(s->thread_data, &s->thread_data_size, thread_data_size);
		1217	if (!m)
		1218	return AVERROR(ENOMEM);
		1219	s->thread_data = m;
		1220	memset(s->thread_data + prev_size, 0, s->thread_data_size - prev_size);
		1221	}
		1222
		1223	if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
		1224	return ret;
		1225
		1226	if (buf_end - buf < scan_line_blocks * 8)
		1227	return AVERROR_INVALIDDATA;
		1228	s->table = buf;
		1229	ptr = picture->data[0];
		1230
		1231	// Zero out the start if ymin is not 0
		1232	for (y = 0; y < s->ymin; y++) {
		1233	memset(ptr, 0, out_line_size);
		1234	ptr += picture->linesize[0];
		1235	}
		1236
		1237	s->picture = picture;
		1238	avctx->execute2(avctx, decode_block, s->thread_data, NULL, scan_line_blocks);
		1239
		1240	// Zero out the end if ymax+1 is not h
		1241	for (y = s->ymax + 1; y < avctx->height; y++) {
		1242	memset(ptr, 0, out_line_size);
		1243	ptr += picture->linesize[0];
		1244	}
		1245
		1246	picture->pict_type = AV_PICTURE_TYPE_I;
		1247	*got_frame = 1;
		1248
		1249	return buf_size;
		1250	}
		1251
		1252	static av_cold int decode_end(AVCodecContext *avctx)
		1253	{
		1254	EXRContext *s = avctx->priv_data;
		1255	int i;
		1256
		1257	for (i = 0; i < s->thread_data_size / sizeof(EXRThreadData); i++) {
		1258	EXRThreadData *td = &s->thread_data[i];
		1259	av_freep(&td->uncompressed_data);
		1260	av_freep(&td->tmp);
		1261	av_freep(&td->bitmap);
		1262	av_freep(&td->lut);
		1263	}
		1264
		1265	av_freep(&s->thread_data);
		1266	s->thread_data_size = 0;
		1267	av_freep(&s->channels);
		1268
		1269	return 0;
		1270	}
		1271
		1272	AVCodec ff_exr_decoder = {
		1273	.name = "exr",
		1274	.long_name = NULL_IF_CONFIG_SMALL("OpenEXR image"),
		1275	.type = AVMEDIA_TYPE_VIDEO,
		1276	.id = AV_CODEC_ID_EXR,
		1277	.priv_data_size = sizeof(EXRContext),
		1278	.close = decode_end,
		1279	.decode = decode_frame,
		1280	.capabilities = CODEC_CAP_DR1 \| CODEC_CAP_FRAME_THREADS \| CODEC_CAP_SLICE_THREADS,
		1281	};

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(root)/contrib/sdk/sources/ffmpeg/libavcodec/exr.c – Rev 4871