chasing indexing error

1 files changed, 0 insertions, 1278 deletions

diff --git a/ffmpeg/libavcodec/exr.c b/ffmpeg/libavcodec/exr.c
deleted file mode 100644
index f231b70..0000000
--- a/ffmpeg/libavcodec/exr.c
+++ /dev/null
@@ -1,1278 +0,0 @@
-/*
- * OpenEXR (.exr) image decoder
- * Copyright (c) 2009 Jimmy Christensen
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * OpenEXR decoder
- * @author Jimmy Christensen
- *
- * For more information on the OpenEXR format, visit:
- *  http://openexr.com/
- *
- * exr_flt2uint() and exr_halflt2uint() is credited to  Reimar Döffinger
- */
-
-#include <zlib.h>
-
-#include "get_bits.h"
-#include "avcodec.h"
-#include "bytestream.h"
-#include "internal.h"
-#include "mathops.h"
-#include "thread.h"
-#include "libavutil/imgutils.h"
-#include "libavutil/avassert.h"
-
-enum ExrCompr {
-    EXR_RAW   = 0,
-    EXR_RLE   = 1,
-    EXR_ZIP1  = 2,
-    EXR_ZIP16 = 3,
-    EXR_PIZ   = 4,
-    EXR_PXR24 = 5,
-    EXR_B44   = 6,
-    EXR_B44A  = 7,
-};
-
-enum ExrPixelType {
-    EXR_UINT,
-    EXR_HALF,
-    EXR_FLOAT
-};
-
-typedef struct EXRChannel {
-    int               xsub, ysub;
-    enum ExrPixelType pixel_type;
-} EXRChannel;
-
-typedef struct EXRThreadData {
-    uint8_t *uncompressed_data;
-    int uncompressed_size;
-
-    uint8_t *tmp;
-    int tmp_size;
-
-    uint8_t *bitmap;
-    uint16_t *lut;
-} EXRThreadData;
-
-typedef struct EXRContext {
-    AVFrame *picture;
-    int compr;
-    enum ExrPixelType pixel_type;
-    int channel_offsets[4]; // 0 = red, 1 = green, 2 = blue and 3 = alpha
-    const AVPixFmtDescriptor *desc;
-
-    uint32_t xmax, xmin;
-    uint32_t ymax, ymin;
-    uint32_t xdelta, ydelta;
-
-    int ysize;
-
-    uint64_t scan_line_size;
-    int scan_lines_per_block;
-
-    const uint8_t *buf, *table;
-    int buf_size;
-
-    EXRChannel *channels;
-    int nb_channels;
-
-    EXRThreadData *thread_data;
-    int thread_data_size;
-} EXRContext;
-
-/**
- * Converts from 32-bit float as uint32_t to uint16_t
- *
- * @param v 32-bit float
- * @return normalized 16-bit unsigned int
- */
-static inline uint16_t exr_flt2uint(uint32_t v)
-{
-    unsigned int exp = v >> 23;
-    // "HACK": negative values result in exp<  0, so clipping them to 0
-    // is also handled by this condition, avoids explicit check for sign bit.
-    if (exp<= 127 + 7 - 24) // we would shift out all bits anyway
-        return 0;
-    if (exp >= 127)
-        return 0xffff;
-    v &= 0x007fffff;
-    return (v + (1 << 23)) >> (127 + 7 - exp);
-}
-
-/**
- * Converts from 16-bit float as uint16_t to uint16_t
- *
- * @param v 16-bit float
- * @return normalized 16-bit unsigned int
- */
-static inline uint16_t exr_halflt2uint(uint16_t v)
-{
-    unsigned exp = 14 - (v >> 10);
-    if (exp >= 14) {
-        if (exp == 14) return (v >> 9) & 1;
-        else           return (v & 0x8000) ? 0 : 0xffff;
-    }
-    v <<= 6;
-    return (v + (1 << 16)) >> (exp + 1);
-}
-
-/**
- * Gets the size of the header variable
- *
- * @param **buf the current pointer location in the header where
- * the variable data starts
- * @param *buf_end pointer location of the end of the buffer
- * @return size of variable data
- */
-static unsigned int get_header_variable_length(const uint8_t **buf,
-                                               const uint8_t *buf_end)
-{
-    unsigned int variable_buffer_data_size = bytestream_get_le32(buf);
-    if (variable_buffer_data_size >= buf_end - *buf)
-        return 0;
-    return variable_buffer_data_size;
-}
-
-/**
- * Checks if the variable name corresponds with it's data type
- *
- * @param *avctx the AVCodecContext
- * @param **buf the current pointer location in the header where
- * the variable name starts
- * @param *buf_end pointer location of the end of the buffer
- * @param *value_name name of the varible to check
- * @param *value_type type of the varible to check
- * @param minimum_length minimum length of the variable data
- * @param variable_buffer_data_size variable length read from the header
- * after it's checked
- * @return negative if variable is invalid
- */
-static int check_header_variable(AVCodecContext *avctx,
-                                              const uint8_t **buf,
-                                              const uint8_t *buf_end,
-                                              const char *value_name,
-                                              const char *value_type,
-                                              unsigned int minimum_length,
-                                              unsigned int *variable_buffer_data_size)
-{
-    if (buf_end - *buf >= minimum_length && !strcmp(*buf, value_name)) {
-        *buf += strlen(value_name)+1;
-        if (!strcmp(*buf, value_type)) {
-            *buf += strlen(value_type)+1;
-            *variable_buffer_data_size = get_header_variable_length(buf, buf_end);
-            if (!*variable_buffer_data_size)
-                av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
-            return 1;
-        }
-        *buf -= strlen(value_name)+1;
-        av_log(avctx, AV_LOG_WARNING, "Unknown data type for header variable %s\n", value_name);
-    }
-    return -1;
-}
-
-static void predictor(uint8_t *src, int size)
-{
-    uint8_t *t = src + 1;
-    uint8_t *stop = src + size;
-
-    while (t < stop) {
-        int d = (int)t[-1] + (int)t[0] - 128;
-        t[0] = d;
-        ++t;
-    }
-}
-
-static void reorder_pixels(uint8_t *src, uint8_t *dst, int size)
-{
-    const int8_t *t1 = src;
-    const int8_t *t2 = src + (size + 1) / 2;
-    int8_t *s = dst;
-    int8_t *stop = s + size;
-
-    while (1) {
-        if (s < stop)
-            *(s++) = *(t1++);
-        else
-            break;
-
-        if (s < stop)
-            *(s++) = *(t2++);
-        else
-            break;
-    }
-}
-
-static int zip_uncompress(const uint8_t *src, int compressed_size,
-                          int uncompressed_size, EXRThreadData *td)
-{
-    unsigned long dest_len = uncompressed_size;
-
-    if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK ||
-        dest_len != uncompressed_size)
-        return AVERROR(EINVAL);
-
-    predictor(td->tmp, uncompressed_size);
-    reorder_pixels(td->tmp, td->uncompressed_data, uncompressed_size);
-
-    return 0;
-}
-
-static int rle_uncompress(const uint8_t *src, int compressed_size,
-                          int uncompressed_size, EXRThreadData *td)
-{
-    int8_t *d = (int8_t *)td->tmp;
-    const int8_t *s = (const int8_t *)src;
-    int ssize = compressed_size;
-    int dsize = uncompressed_size;
-    int8_t *dend = d + dsize;
-    int count;
-
-    while (ssize > 0) {
-        count = *s++;
-
-        if (count < 0) {
-            count = -count;
-
-            if ((dsize -= count    ) < 0 ||
-                (ssize -= count + 1) < 0)
-                return -1;
-
-            while (count--)
-                *d++ = *s++;
-        } else {
-            count++;
-
-            if ((dsize -= count) < 0 ||
-                (ssize -= 2    ) < 0)
-                return -1;
-
-            while (count--)
-                *d++ = *s;
-
-            s++;
-        }
-    }
-
-    if (dend != d)
-        return AVERROR_INVALIDDATA;
-
-    predictor(td->tmp, uncompressed_size);
-    reorder_pixels(td->tmp, td->uncompressed_data, uncompressed_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)
-            av_freep(&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)
-{
-    unsigned long dest_len = uncompressed_size;
-    const uint8_t *in = td->tmp;
-    uint8_t *out;
-    int c, i, j;
-
-    if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK ||
-        dest_len != uncompressed_size)
-        return AVERROR(EINVAL);
-
-    out = td->uncompressed_data;
-    for (i = 0; i < s->ysize; i++) {
-        for (c = 0; c < s->nb_channels; c++) {
-            EXRChannel *channel = &s->channels[c];
-            const uint8_t *ptr[4];
-            uint32_t pixel = 0;
-
-            switch (channel->pixel_type) {
-            case EXR_FLOAT:
-                ptr[0] = in;
-                ptr[1] = ptr[0] + s->xdelta;
-                ptr[2] = ptr[1] + s->xdelta;
-                in = ptr[2] + s->xdelta;
-
-                for (j = 0; j < s->xdelta; ++j) {
-                    uint32_t diff = (*(ptr[0]++) << 24) |
-                                    (*(ptr[1]++) << 16) |
-                                    (*(ptr[2]++) <<  8);
-                    pixel += diff;
-                    bytestream_put_le32(&out, pixel);
-                }
-                break;
-            case EXR_HALF:
-                ptr[0] = in;
-                ptr[1] = ptr[0] + s->xdelta;
-                in = ptr[1] + s->xdelta;
-                for (j = 0; j < s->xdelta; j++) {
-                    uint32_t diff = (*(ptr[0]++) << 8) | *(ptr[1]++);
-
-                    pixel += diff;
-                    bytestream_put_le16(&out, pixel);
-                }
-                break;
-            default:
-                av_assert1(0);
-            }
-        }
-    }
-
-    return 0;
-}
-
-static int decode_block(AVCodecContext *avctx, void *tdata,
-                        int jobnr, int threadnr)
-{
-    EXRContext *s = avctx->priv_data;
-    AVFrame *const p = s->picture;
-    EXRThreadData *td = &s->thread_data[threadnr];
-    const uint8_t *channel_buffer[4] = { 0 };
-    const uint8_t *buf = s->buf;
-    uint64_t line_offset, uncompressed_size;
-    uint32_t xdelta = s->xdelta;
-    uint16_t *ptr_x;
-    uint8_t *ptr;
-    int32_t data_size, line;
-    const uint8_t *src;
-    int axmax = (avctx->width - (s->xmax + 1)) * 2 * s->desc->nb_components;
-    int bxmin = s->xmin * 2 * s->desc->nb_components;
-    int i, x, buf_size = s->buf_size;
-    int av_unused ret;
-
-    line_offset = AV_RL64(s->table + jobnr * 8);
-    // Check if the buffer has the required bytes needed from the offset
-    if (line_offset > buf_size - 8)
-        return AVERROR_INVALIDDATA;
-
-    src = buf + line_offset + 8;
-    line = AV_RL32(src - 8);
-    if (line < s->ymin || line > s->ymax)
-        return AVERROR_INVALIDDATA;
-
-    data_size = AV_RL32(src - 4);
-    if (data_size <= 0 || data_size > buf_size)
-        return AVERROR_INVALIDDATA;
-
-    s->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1);
-    uncompressed_size = s->scan_line_size * s->ysize;
-    if ((s->compr == EXR_RAW && (data_size != uncompressed_size ||
-                                 line_offset > buf_size - uncompressed_size)) ||
-        (s->compr != EXR_RAW && (data_size > uncompressed_size ||
-                                 line_offset > buf_size - data_size))) {
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (data_size < uncompressed_size) {
-        av_fast_padded_malloc(&td->uncompressed_data, &td->uncompressed_size, uncompressed_size);
-        av_fast_padded_malloc(&td->tmp, &td->tmp_size, uncompressed_size);
-        if (!td->uncompressed_data || !td->tmp)
-            return AVERROR(ENOMEM);
-
-        switch (s->compr) {
-        case EXR_ZIP1:
-        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;
-        case EXR_RLE:
-            ret = rle_uncompress(src, data_size, uncompressed_size, td);
-        }
-
-        src = td->uncompressed_data;
-    }
-
-    channel_buffer[0] = src + xdelta * s->channel_offsets[0];
-    channel_buffer[1] = src + xdelta * s->channel_offsets[1];
-    channel_buffer[2] = src + xdelta * s->channel_offsets[2];
-    if (s->channel_offsets[3] >= 0)
-        channel_buffer[3] = src + xdelta * s->channel_offsets[3];
-
-    ptr = p->data[0] + line * p->linesize[0];
-    for (i = 0; i < s->scan_lines_per_block && line + i <= s->ymax; i++, ptr += p->linesize[0]) {
-        const uint8_t *r, *g, *b, *a;
-
-        r = channel_buffer[0];
-        g = channel_buffer[1];
-        b = channel_buffer[2];
-        if (channel_buffer[3])
-            a = channel_buffer[3];
-
-        ptr_x = (uint16_t *)ptr;
-
-        // Zero out the start if xmin is not 0
-        memset(ptr_x, 0, bxmin);
-        ptr_x += s->xmin * s->desc->nb_components;
-        if (s->pixel_type == EXR_FLOAT) {
-            // 32-bit
-            for (x = 0; x < xdelta; x++) {
-                *ptr_x++ = exr_flt2uint(bytestream_get_le32(&r));
-                *ptr_x++ = exr_flt2uint(bytestream_get_le32(&g));
-                *ptr_x++ = exr_flt2uint(bytestream_get_le32(&b));
-                if (channel_buffer[3])
-                    *ptr_x++ = exr_flt2uint(bytestream_get_le32(&a));
-            }
-        } else {
-            // 16-bit
-            for (x = 0; x < xdelta; x++) {
-                *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&r));
-                *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&g));
-                *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&b));
-                if (channel_buffer[3])
-                    *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&a));
-            }
-        }
-
-        // Zero out the end if xmax+1 is not w
-        memset(ptr_x, 0, axmax);
-
-        channel_buffer[0] += s->scan_line_size;
-        channel_buffer[1] += s->scan_line_size;
-        channel_buffer[2] += s->scan_line_size;
-        if (channel_buffer[3])
-            channel_buffer[3] += s->scan_line_size;
-    }
-
-    return 0;
-}
-
-static int decode_frame(AVCodecContext *avctx,
-                        void *data,
-                        int *got_frame,
-                        AVPacket *avpkt)
-{
-    const uint8_t *buf      = avpkt->data;
-    unsigned int   buf_size = avpkt->size;
-    const uint8_t *buf_end  = buf + buf_size;
-
-    EXRContext *const s = avctx->priv_data;
-    ThreadFrame frame = { .f = data };
-    AVFrame *picture  = data;
-    uint8_t *ptr;
-
-    int i, y, magic_number, version, flags, ret;
-    int w = 0;
-    int h = 0;
-
-    int out_line_size;
-    int scan_line_blocks;
-
-    unsigned int current_channel_offset = 0;
-
-    s->xmin = ~0;
-    s->xmax = ~0;
-    s->ymin = ~0;
-    s->ymax = ~0;
-    s->xdelta = ~0;
-    s->ydelta = ~0;
-    s->channel_offsets[0] = -1;
-    s->channel_offsets[1] = -1;
-    s->channel_offsets[2] = -1;
-    s->channel_offsets[3] = -1;
-    s->pixel_type = -1;
-    s->nb_channels = 0;
-    s->compr = -1;
-    s->buf = buf;
-    s->buf_size = buf_size;
-
-    if (buf_size < 10) {
-        av_log(avctx, AV_LOG_ERROR, "Too short header to parse\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    magic_number = bytestream_get_le32(&buf);
-    if (magic_number != 20000630) { // As per documentation of OpenEXR it's supposed to be int 20000630 little-endian
-        av_log(avctx, AV_LOG_ERROR, "Wrong magic number %d\n", magic_number);
-        return AVERROR_INVALIDDATA;
-    }
-
-    version = bytestream_get_byte(&buf);
-    if (version != 2) {
-        avpriv_report_missing_feature(avctx, "Version %d", version);
-        return AVERROR_PATCHWELCOME;
-    }
-
-    flags = bytestream_get_le24(&buf);
-    if (flags & 0x2) {
-        avpriv_report_missing_feature(avctx, "Tile support");
-        return AVERROR_PATCHWELCOME;
-    }
-
-    // Parse the header
-    while (buf < buf_end && buf[0]) {
-        unsigned int variable_buffer_data_size;
-        // Process the channel list
-        if (check_header_variable(avctx, &buf, buf_end, "channels", "chlist", 38, &variable_buffer_data_size) >= 0) {
-            const uint8_t *channel_list_end;
-            if (!variable_buffer_data_size)
-                return AVERROR_INVALIDDATA;
-
-            channel_list_end = buf + variable_buffer_data_size;
-            while (channel_list_end - buf >= 19) {
-                EXRChannel *channel;
-                enum ExrPixelType current_pixel_type;
-                int channel_index = -1;
-                int xsub, ysub;
-
-                if (!strcmp(buf, "R"))
-                    channel_index = 0;
-                else if (!strcmp(buf, "G"))
-                    channel_index = 1;
-                else if (!strcmp(buf, "B"))
-                    channel_index = 2;
-                else if (!strcmp(buf, "A"))
-                    channel_index = 3;
-                else
-                    av_log(avctx, AV_LOG_WARNING, "Unsupported channel %.256s\n", buf);
-
-                while (bytestream_get_byte(&buf) && buf < channel_list_end)
-                    continue; /* skip */
-
-                if (channel_list_end - * &buf < 4) {
-                    av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
-                    return AVERROR_INVALIDDATA;
-                }
-
-                current_pixel_type = bytestream_get_le32(&buf);
-                if (current_pixel_type > 2) {
-                    av_log(avctx, AV_LOG_ERROR, "Unknown pixel type\n");
-                    return AVERROR_INVALIDDATA;
-                }
-
-                buf += 4;
-                xsub = bytestream_get_le32(&buf);
-                ysub = bytestream_get_le32(&buf);
-                if (xsub != 1 || ysub != 1) {
-                    avpriv_report_missing_feature(avctx, "Subsampling %dx%d", xsub, ysub);
-                    return AVERROR_PATCHWELCOME;
-                }
-
-                if (channel_index >= 0) {
-                    if (s->pixel_type != -1 && s->pixel_type != current_pixel_type) {
-                        av_log(avctx, AV_LOG_ERROR, "RGB channels not of the same depth\n");
-                        return AVERROR_INVALIDDATA;
-                    }
-                    s->pixel_type = current_pixel_type;
-                    s->channel_offsets[channel_index] = current_channel_offset;
-                }
-
-                s->channels = av_realloc_f(s->channels, ++s->nb_channels, sizeof(EXRChannel));
-                if (!s->channels)
-                    return AVERROR(ENOMEM);
-                channel = &s->channels[s->nb_channels - 1];
-                channel->pixel_type = current_pixel_type;
-                channel->xsub = xsub;
-                channel->ysub = ysub;
-
-                current_channel_offset += 1 << current_pixel_type;
-            }
-
-            /* Check if all channels are set with an offset or if the channels
-             * are causing an overflow  */
-
-            if (FFMIN3(s->channel_offsets[0],
-                       s->channel_offsets[1],
-                       s->channel_offsets[2]) < 0) {
-                if (s->channel_offsets[0] < 0)
-                    av_log(avctx, AV_LOG_ERROR, "Missing red channel\n");
-                if (s->channel_offsets[1] < 0)
-                    av_log(avctx, AV_LOG_ERROR, "Missing green channel\n");
-                if (s->channel_offsets[2] < 0)
-                    av_log(avctx, AV_LOG_ERROR, "Missing blue channel\n");
-                return AVERROR_INVALIDDATA;
-            }
-
-            buf = channel_list_end;
-            continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "dataWindow", "box2i", 31, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
-                return AVERROR_INVALIDDATA;
-
-            s->xmin = AV_RL32(buf);
-            s->ymin = AV_RL32(buf + 4);
-            s->xmax = AV_RL32(buf + 8);
-            s->ymax = AV_RL32(buf + 12);
-            s->xdelta = (s->xmax - s->xmin) + 1;
-            s->ydelta = (s->ymax - s->ymin) + 1;
-
-            buf += variable_buffer_data_size;
-            continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "displayWindow", "box2i", 34, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
-                return AVERROR_INVALIDDATA;
-
-            w = AV_RL32(buf + 8) + 1;
-            h = AV_RL32(buf + 12) + 1;
-
-            buf += variable_buffer_data_size;
-            continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "lineOrder", "lineOrder", 25, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
-                return AVERROR_INVALIDDATA;
-
-            av_log(avctx, AV_LOG_DEBUG, "line order : %d\n", *buf);
-            if (*buf > 2) {
-                av_log(avctx, AV_LOG_ERROR, "Unknown line order\n");
-                return AVERROR_INVALIDDATA;
-            }
-
-            buf += variable_buffer_data_size;
-            continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "pixelAspectRatio", "float", 31, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
-                return AVERROR_INVALIDDATA;
-
-            avctx->sample_aspect_ratio = av_d2q(av_int2float(AV_RL32(buf)), 255);
-
-            buf += variable_buffer_data_size;
-            continue;
-        } else if (check_header_variable(avctx, &buf, buf_end, "compression", "compression", 29, &variable_buffer_data_size) >= 0) {
-            if (!variable_buffer_data_size)
-                return AVERROR_INVALIDDATA;
-
-            if (s->compr == -1)
-                s->compr = *buf;
-            else
-                av_log(avctx, AV_LOG_WARNING, "Found more than one compression attribute\n");
-
-            buf += variable_buffer_data_size;
-            continue;
-        }
-
-        // Check if there is enough bytes for a header
-        if (buf_end - buf <= 9) {
-            av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
-            return AVERROR_INVALIDDATA;
-        }
-
-        // Process unknown variables
-        for (i = 0; i < 2; i++) {
-            // Skip variable name/type
-            while (++buf < buf_end)
-                if (buf[0] == 0x0)
-                    break;
-        }
-        buf++;
-        // Skip variable length
-        if (buf_end - buf >= 5) {
-            variable_buffer_data_size = get_header_variable_length(&buf, buf_end);
-            if (!variable_buffer_data_size) {
-                av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
-                return AVERROR_INVALIDDATA;
-            }
-            buf += variable_buffer_data_size;
-        }
-    }
-
-    if (s->compr == -1) {
-        av_log(avctx, AV_LOG_ERROR, "Missing compression attribute\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    if (buf >= buf_end) {
-        av_log(avctx, AV_LOG_ERROR, "Incomplete frame\n");
-        return AVERROR_INVALIDDATA;
-    }
-    buf++;
-
-    switch (s->pixel_type) {
-    case EXR_FLOAT:
-    case EXR_HALF:
-        if (s->channel_offsets[3] >= 0)
-            avctx->pix_fmt = AV_PIX_FMT_RGBA64;
-        else
-            avctx->pix_fmt = AV_PIX_FMT_RGB48;
-        break;
-    case EXR_UINT:
-        avpriv_request_sample(avctx, "32-bit unsigned int");
-        return AVERROR_PATCHWELCOME;
-    default:
-        av_log(avctx, AV_LOG_ERROR, "Missing channel list\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    switch (s->compr) {
-    case EXR_RAW:
-    case EXR_RLE:
-    case EXR_ZIP1:
-        s->scan_lines_per_block = 1;
-        break;
-    case EXR_PXR24:
-    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;
-    }
-
-    // Verify the xmin, xmax, ymin, ymax and xdelta before setting the actual image size
-    if (s->xmin > s->xmax ||
-        s->ymin > s->ymax ||
-        s->xdelta != s->xmax - s->xmin + 1 ||
-        s->xmax >= w || s->ymax >= h) {
-        av_log(avctx, AV_LOG_ERROR, "Wrong sizing or missing size information\n");
-        return AVERROR_INVALIDDATA;
-    }
-
-    if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
-        return ret;
-
-    s->desc = av_pix_fmt_desc_get(avctx->pix_fmt);
-    out_line_size = avctx->width * 2 * s->desc->nb_components;
-    s->scan_line_size = s->xdelta * current_channel_offset;
-    scan_line_blocks = (s->ydelta + s->scan_lines_per_block - 1) / s->scan_lines_per_block;
-
-    if (s->compr != EXR_RAW) {
-        size_t thread_data_size, prev_size;
-        EXRThreadData *m;
-
-        prev_size = s->thread_data_size;
-        if (av_size_mult(avctx->thread_count, sizeof(EXRThreadData), &thread_data_size))
-            return AVERROR(EINVAL);
-
-        m = av_fast_realloc(s->thread_data, &s->thread_data_size, thread_data_size);
-        if (!m)
-            return AVERROR(ENOMEM);
-        s->thread_data = m;
-        memset(s->thread_data + prev_size, 0, s->thread_data_size - prev_size);
-    }
-
-    if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
-        return ret;
-
-    if (buf_end - buf < scan_line_blocks * 8)
-        return AVERROR_INVALIDDATA;
-    s->table = buf;
-    ptr = picture->data[0];
-
-    // Zero out the start if ymin is not 0
-    for (y = 0; y < s->ymin; y++) {
-        memset(ptr, 0, out_line_size);
-        ptr += picture->linesize[0];
-    }
-
-    s->picture = picture;
-    avctx->execute2(avctx, decode_block, s->thread_data, NULL, scan_line_blocks);
-
-    // Zero out the end if ymax+1 is not h
-    for (y = s->ymax + 1; y < avctx->height; y++) {
-        memset(ptr, 0, out_line_size);
-        ptr += picture->linesize[0];
-    }
-
-    picture->pict_type = AV_PICTURE_TYPE_I;
-    *got_frame = 1;
-
-    return buf_size;
-}
-
-static av_cold int decode_end(AVCodecContext *avctx)
-{
-    EXRContext *s = avctx->priv_data;
-    int i;
-
-    for (i = 0; i < s->thread_data_size / sizeof(EXRThreadData); i++) {
-        EXRThreadData *td = &s->thread_data[i];
-        av_freep(&td->uncompressed_data);
-        av_freep(&td->tmp);
-        av_freep(&td->bitmap);
-        av_freep(&td->lut);
-    }
-
-    av_freep(&s->thread_data);
-    s->thread_data_size = 0;
-    av_freep(&s->channels);
-
-    return 0;
-}
-
-AVCodec ff_exr_decoder = {
-    .name               = "exr",
-    .long_name          = NULL_IF_CONFIG_SMALL("OpenEXR image"),
-    .type               = AVMEDIA_TYPE_VIDEO,
-    .id                 = AV_CODEC_ID_EXR,
-    .priv_data_size     = sizeof(EXRContext),
-    .close              = decode_end,
-    .decode             = decode_frame,
-    .capabilities       = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,
-};