yading@10: /*
yading@10:  * OpenEXR (.exr) image decoder
yading@10:  * Copyright (c) 2009 Jimmy Christensen
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * OpenEXR decoder
yading@10:  * @author Jimmy Christensen
yading@10:  *
yading@10:  * For more information on the OpenEXR format, visit:
yading@10:  *  http://openexr.com/
yading@10:  *
yading@10:  * exr_flt2uint() and exr_halflt2uint() is credited to  Reimar Döffinger
yading@10:  */
yading@10: 
yading@10: #include <zlib.h>
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "mathops.h"
yading@10: #include "thread.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/avassert.h"
yading@10: 
yading@10: enum ExrCompr {
yading@10:     EXR_RAW   = 0,
yading@10:     EXR_RLE   = 1,
yading@10:     EXR_ZIP1  = 2,
yading@10:     EXR_ZIP16 = 3,
yading@10:     EXR_PIZ   = 4,
yading@10:     EXR_PXR24 = 5,
yading@10:     EXR_B44   = 6,
yading@10:     EXR_B44A  = 7,
yading@10: };
yading@10: 
yading@10: enum ExrPixelType {
yading@10:     EXR_UINT,
yading@10:     EXR_HALF,
yading@10:     EXR_FLOAT
yading@10: };
yading@10: 
yading@10: typedef struct EXRChannel {
yading@10:     int               xsub, ysub;
yading@10:     enum ExrPixelType pixel_type;
yading@10: } EXRChannel;
yading@10: 
yading@10: typedef struct EXRThreadData {
yading@10:     uint8_t *uncompressed_data;
yading@10:     int uncompressed_size;
yading@10: 
yading@10:     uint8_t *tmp;
yading@10:     int tmp_size;
yading@10: } EXRThreadData;
yading@10: 
yading@10: typedef struct EXRContext {
yading@10:     AVFrame *picture;
yading@10:     int compr;
yading@10:     enum ExrPixelType pixel_type;
yading@10:     int channel_offsets[4]; // 0 = red, 1 = green, 2 = blue and 3 = alpha
yading@10:     const AVPixFmtDescriptor *desc;
yading@10: 
yading@10:     uint32_t xmax, xmin;
yading@10:     uint32_t ymax, ymin;
yading@10:     uint32_t xdelta, ydelta;
yading@10: 
yading@10:     int ysize;
yading@10: 
yading@10:     uint64_t scan_line_size;
yading@10:     int scan_lines_per_block;
yading@10: 
yading@10:     const uint8_t *buf, *table;
yading@10:     int buf_size;
yading@10: 
yading@10:     EXRChannel *channels;
yading@10:     int nb_channels;
yading@10: 
yading@10:     EXRThreadData *thread_data;
yading@10:     int thread_data_size;
yading@10: } EXRContext;
yading@10: 
yading@10: /**
yading@10:  * Converts from 32-bit float as uint32_t to uint16_t
yading@10:  *
yading@10:  * @param v 32-bit float
yading@10:  * @return normalized 16-bit unsigned int
yading@10:  */
yading@10: static inline uint16_t exr_flt2uint(uint32_t v)
yading@10: {
yading@10:     unsigned int exp = v >> 23;
yading@10:     // "HACK": negative values result in exp<  0, so clipping them to 0
yading@10:     // is also handled by this condition, avoids explicit check for sign bit.
yading@10:     if (exp<= 127 + 7 - 24) // we would shift out all bits anyway
yading@10:         return 0;
yading@10:     if (exp >= 127)
yading@10:         return 0xffff;
yading@10:     v &= 0x007fffff;
yading@10:     return (v + (1 << 23)) >> (127 + 7 - exp);
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Converts from 16-bit float as uint16_t to uint16_t
yading@10:  *
yading@10:  * @param v 16-bit float
yading@10:  * @return normalized 16-bit unsigned int
yading@10:  */
yading@10: static inline uint16_t exr_halflt2uint(uint16_t v)
yading@10: {
yading@10:     unsigned exp = 14 - (v >> 10);
yading@10:     if (exp >= 14) {
yading@10:         if (exp == 14) return (v >> 9) & 1;
yading@10:         else           return (v & 0x8000) ? 0 : 0xffff;
yading@10:     }
yading@10:     v <<= 6;
yading@10:     return (v + (1 << 16)) >> (exp + 1);
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Gets the size of the header variable
yading@10:  *
yading@10:  * @param **buf the current pointer location in the header where
yading@10:  * the variable data starts
yading@10:  * @param *buf_end pointer location of the end of the buffer
yading@10:  * @return size of variable data
yading@10:  */
yading@10: static unsigned int get_header_variable_length(const uint8_t **buf,
yading@10:                                                const uint8_t *buf_end)
yading@10: {
yading@10:     unsigned int variable_buffer_data_size = bytestream_get_le32(buf);
yading@10:     if (variable_buffer_data_size >= buf_end - *buf)
yading@10:         return 0;
yading@10:     return variable_buffer_data_size;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Checks if the variable name corresponds with it's data type
yading@10:  *
yading@10:  * @param *avctx the AVCodecContext
yading@10:  * @param **buf the current pointer location in the header where
yading@10:  * the variable name starts
yading@10:  * @param *buf_end pointer location of the end of the buffer
yading@10:  * @param *value_name name of the varible to check
yading@10:  * @param *value_type type of the varible to check
yading@10:  * @param minimum_length minimum length of the variable data
yading@10:  * @param variable_buffer_data_size variable length read from the header
yading@10:  * after it's checked
yading@10:  * @return negative if variable is invalid
yading@10:  */
yading@10: static int check_header_variable(AVCodecContext *avctx,
yading@10:                                               const uint8_t **buf,
yading@10:                                               const uint8_t *buf_end,
yading@10:                                               const char *value_name,
yading@10:                                               const char *value_type,
yading@10:                                               unsigned int minimum_length,
yading@10:                                               unsigned int *variable_buffer_data_size)
yading@10: {
yading@10:     if (buf_end - *buf >= minimum_length && !strcmp(*buf, value_name)) {
yading@10:         *buf += strlen(value_name)+1;
yading@10:         if (!strcmp(*buf, value_type)) {
yading@10:             *buf += strlen(value_type)+1;
yading@10:             *variable_buffer_data_size = get_header_variable_length(buf, buf_end);
yading@10:             if (!*variable_buffer_data_size)
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
yading@10:             return 1;
yading@10:         }
yading@10:         *buf -= strlen(value_name)+1;
yading@10:         av_log(avctx, AV_LOG_WARNING, "Unknown data type for header variable %s\n", value_name);
yading@10:     }
yading@10:     return -1;
yading@10: }
yading@10: 
yading@10: static void predictor(uint8_t *src, int size)
yading@10: {
yading@10:     uint8_t *t = src + 1;
yading@10:     uint8_t *stop = src + size;
yading@10: 
yading@10:     while (t < stop) {
yading@10:         int d = (int)t[-1] + (int)t[0] - 128;
yading@10:         t[0] = d;
yading@10:         ++t;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void reorder_pixels(uint8_t *src, uint8_t *dst, int size)
yading@10: {
yading@10:     const int8_t *t1 = src;
yading@10:     const int8_t *t2 = src + (size + 1) / 2;
yading@10:     int8_t *s = dst;
yading@10:     int8_t *stop = s + size;
yading@10: 
yading@10:     while (1) {
yading@10:         if (s < stop)
yading@10:             *(s++) = *(t1++);
yading@10:         else
yading@10:             break;
yading@10: 
yading@10:         if (s < stop)
yading@10:             *(s++) = *(t2++);
yading@10:         else
yading@10:             break;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int zip_uncompress(const uint8_t *src, int compressed_size,
yading@10:                           int uncompressed_size, EXRThreadData *td)
yading@10: {
yading@10:     unsigned long dest_len = uncompressed_size;
yading@10: 
yading@10:     if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK ||
yading@10:         dest_len != uncompressed_size)
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     predictor(td->tmp, uncompressed_size);
yading@10:     reorder_pixels(td->tmp, td->uncompressed_data, uncompressed_size);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int rle_uncompress(const uint8_t *src, int compressed_size,
yading@10:                           int uncompressed_size, EXRThreadData *td)
yading@10: {
yading@10:     int8_t *d = (int8_t *)td->tmp;
yading@10:     const int8_t *s = (const int8_t *)src;
yading@10:     int ssize = compressed_size;
yading@10:     int dsize = uncompressed_size;
yading@10:     int8_t *dend = d + dsize;
yading@10:     int count;
yading@10: 
yading@10:     while (ssize > 0) {
yading@10:         count = *s++;
yading@10: 
yading@10:         if (count < 0) {
yading@10:             count = -count;
yading@10: 
yading@10:             if ((dsize -= count    ) < 0 ||
yading@10:                 (ssize -= count + 1) < 0)
yading@10:                 return -1;
yading@10: 
yading@10:             while (count--)
yading@10:                 *d++ = *s++;
yading@10:         } else {
yading@10:             count++;
yading@10: 
yading@10:             if ((dsize -= count) < 0 ||
yading@10:                 (ssize -= 2    ) < 0)
yading@10:                 return -1;
yading@10: 
yading@10:             while (count--)
yading@10:                 *d++ = *s;
yading@10: 
yading@10:             s++;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (dend != d)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     predictor(td->tmp, uncompressed_size);
yading@10:     reorder_pixels(td->tmp, td->uncompressed_data, uncompressed_size);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int pxr24_uncompress(EXRContext *s, const uint8_t *src,
yading@10:                             int compressed_size, int uncompressed_size,
yading@10:                             EXRThreadData *td)
yading@10: {
yading@10:     unsigned long dest_len = uncompressed_size;
yading@10:     const uint8_t *in = td->tmp;
yading@10:     uint8_t *out;
yading@10:     int c, i, j;
yading@10: 
yading@10:     if (uncompress(td->tmp, &dest_len, src, compressed_size) != Z_OK ||
yading@10:         dest_len != uncompressed_size)
yading@10:         return AVERROR(EINVAL);
yading@10: 
yading@10:     out = td->uncompressed_data;
yading@10:     for (i = 0; i < s->ysize; i++) {
yading@10:         for (c = 0; c < s->nb_channels; c++) {
yading@10:             EXRChannel *channel = &s->channels[c];
yading@10:             const uint8_t *ptr[4];
yading@10:             uint32_t pixel = 0;
yading@10: 
yading@10:             switch (channel->pixel_type) {
yading@10:             case EXR_FLOAT:
yading@10:                 ptr[0] = in;
yading@10:                 ptr[1] = ptr[0] + s->xdelta;
yading@10:                 ptr[2] = ptr[1] + s->xdelta;
yading@10:                 in = ptr[2] + s->xdelta;
yading@10: 
yading@10:                 for (j = 0; j < s->xdelta; ++j) {
yading@10:                     uint32_t diff = (*(ptr[0]++) << 24) |
yading@10:                                     (*(ptr[1]++) << 16) |
yading@10:                                     (*(ptr[2]++) <<  8);
yading@10:                     pixel += diff;
yading@10:                     bytestream_put_le32(&out, pixel);
yading@10:                 }
yading@10:                 break;
yading@10:             case EXR_HALF:
yading@10:                 ptr[0] = in;
yading@10:                 ptr[1] = ptr[0] + s->xdelta;
yading@10:                 in = ptr[1] + s->xdelta;
yading@10:                 for (j = 0; j < s->xdelta; j++) {
yading@10:                     uint32_t diff = (*(ptr[0]++) << 8) | *(ptr[1]++);
yading@10: 
yading@10:                     pixel += diff;
yading@10:                     bytestream_put_le16(&out, pixel);
yading@10:                 }
yading@10:                 break;
yading@10:             default:
yading@10:                 av_assert1(0);
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_block(AVCodecContext *avctx, void *tdata,
yading@10:                         int jobnr, int threadnr)
yading@10: {
yading@10:     EXRContext *s = avctx->priv_data;
yading@10:     AVFrame *const p = s->picture;
yading@10:     EXRThreadData *td = &s->thread_data[threadnr];
yading@10:     const uint8_t *channel_buffer[4] = { 0 };
yading@10:     const uint8_t *buf = s->buf;
yading@10:     uint64_t line_offset, uncompressed_size;
yading@10:     uint32_t xdelta = s->xdelta;
yading@10:     uint16_t *ptr_x;
yading@10:     uint8_t *ptr;
yading@10:     int32_t data_size, line;
yading@10:     const uint8_t *src;
yading@10:     int axmax = (avctx->width - (s->xmax + 1)) * 2 * s->desc->nb_components;
yading@10:     int bxmin = s->xmin * 2 * s->desc->nb_components;
yading@10:     int i, x, buf_size = s->buf_size;
yading@10:     int av_unused ret;
yading@10: 
yading@10:     line_offset = AV_RL64(s->table + jobnr * 8);
yading@10:     // Check if the buffer has the required bytes needed from the offset
yading@10:     if (line_offset > buf_size - 8)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     src = buf + line_offset + 8;
yading@10:     line = AV_RL32(src - 8);
yading@10:     if (line < s->ymin || line > s->ymax)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     data_size = AV_RL32(src - 4);
yading@10:     if (data_size <= 0 || data_size > buf_size)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     s->ysize = FFMIN(s->scan_lines_per_block, s->ymax - line + 1);
yading@10:     uncompressed_size = s->scan_line_size * s->ysize;
yading@10:     if ((s->compr == EXR_RAW && (data_size != uncompressed_size ||
yading@10:                                  line_offset > buf_size - uncompressed_size)) ||
yading@10:         (s->compr != EXR_RAW && (data_size > uncompressed_size ||
yading@10:                                  line_offset > buf_size - data_size))) {
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (data_size < uncompressed_size) {
yading@10:         av_fast_padded_malloc(&td->uncompressed_data, &td->uncompressed_size, uncompressed_size);
yading@10:         av_fast_padded_malloc(&td->tmp, &td->tmp_size, uncompressed_size);
yading@10:         if (!td->uncompressed_data || !td->tmp)
yading@10:             return AVERROR(ENOMEM);
yading@10: 
yading@10:         switch (s->compr) {
yading@10:         case EXR_ZIP1:
yading@10:         case EXR_ZIP16:
yading@10:             ret = zip_uncompress(src, data_size, uncompressed_size, td);
yading@10:             break;
yading@10:         case EXR_PXR24:
yading@10:             ret = pxr24_uncompress(s, src, data_size, uncompressed_size, td);
yading@10:             break;
yading@10:         case EXR_RLE:
yading@10:             ret = rle_uncompress(src, data_size, uncompressed_size, td);
yading@10:         }
yading@10: 
yading@10:         src = td->uncompressed_data;
yading@10:     }
yading@10: 
yading@10:     channel_buffer[0] = src + xdelta * s->channel_offsets[0];
yading@10:     channel_buffer[1] = src + xdelta * s->channel_offsets[1];
yading@10:     channel_buffer[2] = src + xdelta * s->channel_offsets[2];
yading@10:     if (s->channel_offsets[3] >= 0)
yading@10:         channel_buffer[3] = src + xdelta * s->channel_offsets[3];
yading@10: 
yading@10:     ptr = p->data[0] + line * p->linesize[0];
yading@10:     for (i = 0; i < s->scan_lines_per_block && line + i <= s->ymax; i++, ptr += p->linesize[0]) {
yading@10:         const uint8_t *r, *g, *b, *a;
yading@10: 
yading@10:         r = channel_buffer[0];
yading@10:         g = channel_buffer[1];
yading@10:         b = channel_buffer[2];
yading@10:         if (channel_buffer[3])
yading@10:             a = channel_buffer[3];
yading@10: 
yading@10:         ptr_x = (uint16_t *)ptr;
yading@10: 
yading@10:         // Zero out the start if xmin is not 0
yading@10:         memset(ptr_x, 0, bxmin);
yading@10:         ptr_x += s->xmin * s->desc->nb_components;
yading@10:         if (s->pixel_type == EXR_FLOAT) {
yading@10:             // 32-bit
yading@10:             for (x = 0; x < xdelta; x++) {
yading@10:                 *ptr_x++ = exr_flt2uint(bytestream_get_le32(&r));
yading@10:                 *ptr_x++ = exr_flt2uint(bytestream_get_le32(&g));
yading@10:                 *ptr_x++ = exr_flt2uint(bytestream_get_le32(&b));
yading@10:                 if (channel_buffer[3])
yading@10:                     *ptr_x++ = exr_flt2uint(bytestream_get_le32(&a));
yading@10:             }
yading@10:         } else {
yading@10:             // 16-bit
yading@10:             for (x = 0; x < xdelta; x++) {
yading@10:                 *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&r));
yading@10:                 *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&g));
yading@10:                 *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&b));
yading@10:                 if (channel_buffer[3])
yading@10:                     *ptr_x++ = exr_halflt2uint(bytestream_get_le16(&a));
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         // Zero out the end if xmax+1 is not w
yading@10:         memset(ptr_x, 0, axmax);
yading@10: 
yading@10:         channel_buffer[0] += s->scan_line_size;
yading@10:         channel_buffer[1] += s->scan_line_size;
yading@10:         channel_buffer[2] += s->scan_line_size;
yading@10:         if (channel_buffer[3])
yading@10:             channel_buffer[3] += s->scan_line_size;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx,
yading@10:                         void *data,
yading@10:                         int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf      = avpkt->data;
yading@10:     unsigned int   buf_size = avpkt->size;
yading@10:     const uint8_t *buf_end  = buf + buf_size;
yading@10: 
yading@10:     EXRContext *const s = avctx->priv_data;
yading@10:     ThreadFrame frame = { .f = data };
yading@10:     AVFrame *picture  = data;
yading@10:     uint8_t *ptr;
yading@10: 
yading@10:     int i, y, magic_number, version, flags, ret;
yading@10:     int w = 0;
yading@10:     int h = 0;
yading@10: 
yading@10:     int out_line_size;
yading@10:     int scan_line_blocks;
yading@10: 
yading@10:     unsigned int current_channel_offset = 0;
yading@10: 
yading@10:     s->xmin = ~0;
yading@10:     s->xmax = ~0;
yading@10:     s->ymin = ~0;
yading@10:     s->ymax = ~0;
yading@10:     s->xdelta = ~0;
yading@10:     s->ydelta = ~0;
yading@10:     s->channel_offsets[0] = -1;
yading@10:     s->channel_offsets[1] = -1;
yading@10:     s->channel_offsets[2] = -1;
yading@10:     s->channel_offsets[3] = -1;
yading@10:     s->pixel_type = -1;
yading@10:     s->nb_channels = 0;
yading@10:     s->compr = -1;
yading@10:     s->buf = buf;
yading@10:     s->buf_size = buf_size;
yading@10: 
yading@10:     if (buf_size < 10) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Too short header to parse\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     magic_number = bytestream_get_le32(&buf);
yading@10:     if (magic_number != 20000630) { // As per documentation of OpenEXR it's supposed to be int 20000630 little-endian
yading@10:         av_log(avctx, AV_LOG_ERROR, "Wrong magic number %d\n", magic_number);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     version = bytestream_get_byte(&buf);
yading@10:     if (version != 2) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Unsupported version %d\n", version);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     flags = bytestream_get_le24(&buf);
yading@10:     if (flags & 0x2) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Tile based images are not supported\n");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     // Parse the header
yading@10:     while (buf < buf_end && buf[0]) {
yading@10:         unsigned int variable_buffer_data_size;
yading@10:         // Process the channel list
yading@10:         if (check_header_variable(avctx, &buf, buf_end, "channels", "chlist", 38, &variable_buffer_data_size) >= 0) {
yading@10:             const uint8_t *channel_list_end;
yading@10:             if (!variable_buffer_data_size)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             channel_list_end = buf + variable_buffer_data_size;
yading@10:             while (channel_list_end - buf >= 19) {
yading@10:                 EXRChannel *channel;
yading@10:                 int current_pixel_type = -1;
yading@10:                 int channel_index = -1;
yading@10:                 int xsub, ysub;
yading@10: 
yading@10:                 if (!strcmp(buf, "R"))
yading@10:                     channel_index = 0;
yading@10:                 else if (!strcmp(buf, "G"))
yading@10:                     channel_index = 1;
yading@10:                 else if (!strcmp(buf, "B"))
yading@10:                     channel_index = 2;
yading@10:                 else if (!strcmp(buf, "A"))
yading@10:                     channel_index = 3;
yading@10:                 else
yading@10:                     av_log(avctx, AV_LOG_WARNING, "Unsupported channel %.256s\n", buf);
yading@10: 
yading@10:                 while (bytestream_get_byte(&buf) && buf < channel_list_end)
yading@10:                     continue; /* skip */
yading@10: 
yading@10:                 if (channel_list_end - * &buf < 4) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10: 
yading@10:                 current_pixel_type = bytestream_get_le32(&buf);
yading@10:                 if (current_pixel_type > 2) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Unknown pixel type\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10: 
yading@10:                 buf += 4;
yading@10:                 xsub = bytestream_get_le32(&buf);
yading@10:                 ysub = bytestream_get_le32(&buf);
yading@10:                 if (xsub != 1 || ysub != 1) {
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Unsupported subsampling %dx%d\n", xsub, ysub);
yading@10:                     return AVERROR_PATCHWELCOME;
yading@10:                 }
yading@10: 
yading@10:                 if (channel_index >= 0) {
yading@10:                     if (s->pixel_type != -1 && s->pixel_type != current_pixel_type) {
yading@10:                         av_log(avctx, AV_LOG_ERROR, "RGB channels not of the same depth\n");
yading@10:                         return AVERROR_INVALIDDATA;
yading@10:                     }
yading@10:                     s->pixel_type = current_pixel_type;
yading@10:                     s->channel_offsets[channel_index] = current_channel_offset;
yading@10:                 }
yading@10: 
yading@10:                 s->channels = av_realloc_f(s->channels, ++s->nb_channels, sizeof(EXRChannel));
yading@10:                 if (!s->channels)
yading@10:                     return AVERROR(ENOMEM);
yading@10:                 channel = &s->channels[s->nb_channels - 1];
yading@10:                 channel->pixel_type = current_pixel_type;
yading@10:                 channel->xsub = xsub;
yading@10:                 channel->ysub = ysub;
yading@10: 
yading@10:                 current_channel_offset += 1 << current_pixel_type;
yading@10:             }
yading@10: 
yading@10:             /* Check if all channels are set with an offset or if the channels
yading@10:              * are causing an overflow  */
yading@10: 
yading@10:             if (FFMIN3(s->channel_offsets[0],
yading@10:                        s->channel_offsets[1],
yading@10:                        s->channel_offsets[2]) < 0) {
yading@10:                 if (s->channel_offsets[0] < 0)
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Missing red channel\n");
yading@10:                 if (s->channel_offsets[1] < 0)
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Missing green channel\n");
yading@10:                 if (s->channel_offsets[2] < 0)
yading@10:                     av_log(avctx, AV_LOG_ERROR, "Missing blue channel\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10: 
yading@10:             buf = channel_list_end;
yading@10:             continue;
yading@10:         } else if (check_header_variable(avctx, &buf, buf_end, "dataWindow", "box2i", 31, &variable_buffer_data_size) >= 0) {
yading@10:             if (!variable_buffer_data_size)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             s->xmin = AV_RL32(buf);
yading@10:             s->ymin = AV_RL32(buf + 4);
yading@10:             s->xmax = AV_RL32(buf + 8);
yading@10:             s->ymax = AV_RL32(buf + 12);
yading@10:             s->xdelta = (s->xmax - s->xmin) + 1;
yading@10:             s->ydelta = (s->ymax - s->ymin) + 1;
yading@10: 
yading@10:             buf += variable_buffer_data_size;
yading@10:             continue;
yading@10:         } else if (check_header_variable(avctx, &buf, buf_end, "displayWindow", "box2i", 34, &variable_buffer_data_size) >= 0) {
yading@10:             if (!variable_buffer_data_size)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             w = AV_RL32(buf + 8) + 1;
yading@10:             h = AV_RL32(buf + 12) + 1;
yading@10: 
yading@10:             buf += variable_buffer_data_size;
yading@10:             continue;
yading@10:         } else if (check_header_variable(avctx, &buf, buf_end, "lineOrder", "lineOrder", 25, &variable_buffer_data_size) >= 0) {
yading@10:             if (!variable_buffer_data_size)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             av_log(avctx, AV_LOG_DEBUG, "line order : %d\n", *buf);
yading@10:             if (*buf > 2) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Unknown line order\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10: 
yading@10:             buf += variable_buffer_data_size;
yading@10:             continue;
yading@10:         } else if (check_header_variable(avctx, &buf, buf_end, "pixelAspectRatio", "float", 31, &variable_buffer_data_size) >= 0) {
yading@10:             if (!variable_buffer_data_size)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             avctx->sample_aspect_ratio = av_d2q(av_int2float(AV_RL32(buf)), 255);
yading@10: 
yading@10:             buf += variable_buffer_data_size;
yading@10:             continue;
yading@10:         } else if (check_header_variable(avctx, &buf, buf_end, "compression", "compression", 29, &variable_buffer_data_size) >= 0) {
yading@10:             if (!variable_buffer_data_size)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10: 
yading@10:             if (s->compr == -1)
yading@10:                 s->compr = *buf;
yading@10:             else
yading@10:                 av_log(avctx, AV_LOG_WARNING, "Found more than one compression attribute\n");
yading@10: 
yading@10:             buf += variable_buffer_data_size;
yading@10:             continue;
yading@10:         }
yading@10: 
yading@10:         // Check if there is enough bytes for a header
yading@10:         if (buf_end - buf <= 9) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         // Process unknown variables
yading@10:         for (i = 0; i < 2; i++) {
yading@10:             // Skip variable name/type
yading@10:             while (++buf < buf_end)
yading@10:                 if (buf[0] == 0x0)
yading@10:                     break;
yading@10:         }
yading@10:         buf++;
yading@10:         // Skip variable length
yading@10:         if (buf_end - buf >= 5) {
yading@10:             variable_buffer_data_size = get_header_variable_length(&buf, buf_end);
yading@10:             if (!variable_buffer_data_size) {
yading@10:                 av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             buf += variable_buffer_data_size;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (s->compr == -1) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Missing compression attribute\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (buf >= buf_end) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Incomplete frame\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     buf++;
yading@10: 
yading@10:     switch (s->pixel_type) {
yading@10:     case EXR_FLOAT:
yading@10:     case EXR_HALF:
yading@10:         if (s->channel_offsets[3] >= 0)
yading@10:             avctx->pix_fmt = AV_PIX_FMT_RGBA64;
yading@10:         else
yading@10:             avctx->pix_fmt = AV_PIX_FMT_RGB48;
yading@10:         break;
yading@10:     case EXR_UINT:
yading@10:         avpriv_request_sample(avctx, "32-bit unsigned int");
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "Missing channel list\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     switch (s->compr) {
yading@10:     case EXR_RAW:
yading@10:     case EXR_RLE:
yading@10:     case EXR_ZIP1:
yading@10:         s->scan_lines_per_block = 1;
yading@10:         break;
yading@10:     case EXR_PXR24:
yading@10:     case EXR_ZIP16:
yading@10:         s->scan_lines_per_block = 16;
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "Compression type %d is not supported\n", s->compr);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     if (av_image_check_size(w, h, 0, avctx))
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     // Verify the xmin, xmax, ymin, ymax and xdelta before setting the actual image size
yading@10:     if (s->xmin > s->xmax ||
yading@10:         s->ymin > s->ymax ||
yading@10:         s->xdelta != s->xmax - s->xmin + 1 ||
yading@10:         s->xmax >= w || s->ymax >= h) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Wrong sizing or missing size information\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (w != avctx->width || h != avctx->height) {
yading@10:         avcodec_set_dimensions(avctx, w, h);
yading@10:     }
yading@10: 
yading@10:     s->desc = av_pix_fmt_desc_get(avctx->pix_fmt);
yading@10:     out_line_size = avctx->width * 2 * s->desc->nb_components;
yading@10:     s->scan_line_size = s->xdelta * current_channel_offset;
yading@10:     scan_line_blocks = (s->ydelta + s->scan_lines_per_block - 1) / s->scan_lines_per_block;
yading@10: 
yading@10:     if (s->compr != EXR_RAW) {
yading@10:         size_t thread_data_size, prev_size;
yading@10:         EXRThreadData *m;
yading@10: 
yading@10:         prev_size = s->thread_data_size;
yading@10:         if (av_size_mult(avctx->thread_count, sizeof(EXRThreadData), &thread_data_size))
yading@10:             return AVERROR(EINVAL);
yading@10: 
yading@10:         m = av_fast_realloc(s->thread_data, &s->thread_data_size, thread_data_size);
yading@10:         if (!m)
yading@10:             return AVERROR(ENOMEM);
yading@10:         s->thread_data = m;
yading@10:         memset(s->thread_data + prev_size, 0, s->thread_data_size - prev_size);
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (buf_end - buf < scan_line_blocks * 8)
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     s->table = buf;
yading@10:     ptr = picture->data[0];
yading@10: 
yading@10:     // Zero out the start if ymin is not 0
yading@10:     for (y = 0; y < s->ymin; y++) {
yading@10:         memset(ptr, 0, out_line_size);
yading@10:         ptr += picture->linesize[0];
yading@10:     }
yading@10: 
yading@10:     s->picture = picture;
yading@10:     avctx->execute2(avctx, decode_block, s->thread_data, NULL, scan_line_blocks);
yading@10: 
yading@10:     // Zero out the end if ymax+1 is not h
yading@10:     for (y = s->ymax + 1; y < avctx->height; y++) {
yading@10:         memset(ptr, 0, out_line_size);
yading@10:         ptr += picture->linesize[0];
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     EXRContext *s = avctx->priv_data;
yading@10:     int i;
yading@10: 
yading@10:     for (i = 0; i < s->thread_data_size / sizeof(EXRThreadData); i++) {
yading@10:         EXRThreadData *td = &s->thread_data[i];
yading@10:         av_free(td->uncompressed_data);
yading@10:         av_free(td->tmp);
yading@10:     }
yading@10: 
yading@10:     av_freep(&s->thread_data);
yading@10:     s->thread_data_size = 0;
yading@10:     av_freep(&s->channels);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_exr_decoder = {
yading@10:     .name               = "exr",
yading@10:     .type               = AVMEDIA_TYPE_VIDEO,
yading@10:     .id                 = AV_CODEC_ID_EXR,
yading@10:     .priv_data_size     = sizeof(EXRContext),
yading@10:     .close              = decode_end,
yading@10:     .decode             = decode_frame,
yading@10:     .capabilities       = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS | CODEC_CAP_SLICE_THREADS,
yading@10:     .long_name          = NULL_IF_CONFIG_SMALL("OpenEXR image"),
yading@10: };