mirror of https://git.ffmpeg.org/ffmpeg.git
496 lines
17 KiB
C
496 lines
17 KiB
C
/*
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* OpenEXR (.exr) image decoder
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* Copyright (c) 2009 Jimmy Christensen
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* OpenEXR decoder
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* @author Jimmy Christensen
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*
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* For more information on the OpenEXR format, visit:
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* http://openexr.com/
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*
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* exr_flt2uint() and exr_halflt2uint() is credited to Reimar Döffinger
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "libavutil/imgutils.h"
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enum ExrCompr {
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EXR_RAW = 0,
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EXR_RLE = 1,
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EXR_ZIP1 = 2,
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EXR_ZIP16 = 3,
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EXR_PIZ = 4,
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EXR_B44 = 6
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};
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typedef struct EXRContext {
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AVFrame picture;
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int compr;
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int bits_per_color_id;
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int8_t channel_offsets[4]; // 0 = red, 1 = green, 2 = blue and 3 = alpha
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} EXRContext;
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/**
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* Converts from 32-bit float as uint32_t to uint16_t
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*
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* @param v 32-bit float
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* @return normalized 16-bit unsigned int
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*/
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static inline uint16_t exr_flt2uint(uint32_t v)
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{
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unsigned int exp = v >> 23;
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// "HACK": negative values result in exp< 0, so clipping them to 0
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// is also handled by this condition, avoids explicit check for sign bit.
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if (exp<= 127 + 7 - 24) // we would shift out all bits anyway
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return 0;
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if (exp >= 127)
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return 0xffff;
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v &= 0x007fffff;
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return (v + (1 << 23)) >> (127 + 7 - exp);
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}
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/**
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* Converts from 16-bit float as uint16_t to uint16_t
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*
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* @param v 16-bit float
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* @return normalized 16-bit unsigned int
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*/
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static inline uint16_t exr_halflt2uint(uint16_t v)
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{
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unsigned exp = 14 - (v >> 10);
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if (exp >= 14) {
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if (exp == 14) return (v >> 9) & 1;
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else return (v & 0x8000) ? 0 : 0xffff;
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}
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v <<= 6;
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return (v + (1 << 16)) >> (exp + 1);
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}
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/**
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* Gets the size of the header variable
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*
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* @param **buf the current pointer location in the header where
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* the variable data starts
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* @param *buf_end pointer location of the end of the buffer
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* @return size of variable data
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*/
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static unsigned int get_header_variable_length(const uint8_t **buf,
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const uint8_t *buf_end)
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{
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unsigned int variable_buffer_data_size = bytestream_get_le32(buf);
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if (variable_buffer_data_size >= buf_end - *buf)
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return 0;
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return variable_buffer_data_size;
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}
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/**
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* Checks if the variable name corresponds with it's data type
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*
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* @param *avctx the AVCodecContext
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* @param **buf the current pointer location in the header where
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* the variable name starts
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* @param *buf_end pointer location of the end of the buffer
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* @param *value_name name of the varible to check
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* @param *value_type type of the varible to check
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* @param minimum_length minimum length of the variable data
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* @param variable_buffer_data_size variable length read from the header
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* after it's checked
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* @return negative if variable is invalid
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*/
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static int check_header_variable(AVCodecContext *avctx,
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const uint8_t **buf,
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const uint8_t *buf_end,
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const char *value_name,
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const char *value_type,
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unsigned int minimum_length,
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unsigned int *variable_buffer_data_size)
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{
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if (buf_end - *buf >= minimum_length && !strcmp(*buf, value_name)) {
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*buf += strlen(value_name)+1;
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if (!strcmp(*buf, value_type)) {
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*buf += strlen(value_type)+1;
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*variable_buffer_data_size = get_header_variable_length(buf, buf_end);
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if (!*variable_buffer_data_size)
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av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
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if (*variable_buffer_data_size > buf_end - *buf)
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return -1;
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return 1;
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}
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*buf -= strlen(value_name)+1;
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av_log(avctx, AV_LOG_WARNING, "Unknown data type for header variable %s\n", value_name);
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}
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return -1;
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data,
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int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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unsigned int buf_size = avpkt->size;
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const uint8_t *buf_end = buf + buf_size;
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EXRContext *const s = avctx->priv_data;
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AVFrame *picture = data;
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AVFrame *const p = &s->picture;
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uint8_t *ptr;
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int i, x, y, stride, magic_number, version_flag;
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int w = 0;
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int h = 0;
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unsigned int xmin = ~0;
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unsigned int xmax = ~0;
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unsigned int ymin = ~0;
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unsigned int ymax = ~0;
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unsigned int xdelta = ~0;
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unsigned int current_channel_offset = 0;
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s->channel_offsets[0] = -1;
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s->channel_offsets[1] = -1;
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s->channel_offsets[2] = -1;
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s->channel_offsets[3] = -1;
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s->bits_per_color_id = -1;
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if (buf_end - buf < 10) {
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av_log(avctx, AV_LOG_ERROR, "Too short header to parse\n");
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return -1;
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}
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magic_number = bytestream_get_le32(&buf);
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if (magic_number != 20000630) { // As per documentation of OpenEXR it's supposed to be int 20000630 little-endian
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av_log(avctx, AV_LOG_ERROR, "Wrong magic number %d\n", magic_number);
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return -1;
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}
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version_flag = bytestream_get_le32(&buf);
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if ((version_flag & 0x200) == 0x200) {
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av_log(avctx, AV_LOG_ERROR, "Tile based images are not supported\n");
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return -1;
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}
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// Parse the header
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while (buf < buf_end && buf[0]) {
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unsigned int variable_buffer_data_size;
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// Process the channel list
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if (check_header_variable(avctx, &buf, buf_end, "channels", "chlist", 38, &variable_buffer_data_size) >= 0) {
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const uint8_t *channel_list_end;
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if (!variable_buffer_data_size)
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return -1;
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channel_list_end = buf + variable_buffer_data_size;
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while (channel_list_end - buf >= 19) {
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int current_bits_per_color_id = -1;
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int channel_index = -1;
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if (!strcmp(buf, "R"))
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channel_index = 0;
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if (!strcmp(buf, "G"))
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channel_index = 1;
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if (!strcmp(buf, "B"))
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channel_index = 2;
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if (!strcmp(buf, "A"))
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channel_index = 3;
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while (bytestream_get_byte(&buf) && buf < channel_list_end)
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continue; /* skip */
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if (channel_list_end - * &buf < 4) {
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av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
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return -1;
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}
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current_bits_per_color_id = bytestream_get_le32(&buf);
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if (current_bits_per_color_id > 2) {
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av_log(avctx, AV_LOG_ERROR, "Unknown color format\n");
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return -1;
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}
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if (channel_index >= 0) {
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if (s->bits_per_color_id != -1 && s->bits_per_color_id != current_bits_per_color_id) {
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av_log(avctx, AV_LOG_ERROR, "RGB channels not of the same depth\n");
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return -1;
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}
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s->bits_per_color_id = current_bits_per_color_id;
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s->channel_offsets[channel_index] = current_channel_offset;
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}
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current_channel_offset += 1 << current_bits_per_color_id;
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buf += 12;
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}
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/* Check if all channels are set with an offset or if the channels
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* are causing an overflow */
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if (FFMIN3(s->channel_offsets[0],
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s->channel_offsets[1],
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s->channel_offsets[2]) < 0) {
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if (s->channel_offsets[0] < 0)
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av_log(avctx, AV_LOG_ERROR, "Missing red channel\n");
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if (s->channel_offsets[1] < 0)
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av_log(avctx, AV_LOG_ERROR, "Missing green channel\n");
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if (s->channel_offsets[2] < 0)
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av_log(avctx, AV_LOG_ERROR, "Missing blue channel\n");
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return -1;
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}
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buf = channel_list_end;
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continue;
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}
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// Process the dataWindow variable
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if (check_header_variable(avctx, &buf, buf_end, "dataWindow", "box2i", 31, &variable_buffer_data_size) >= 0) {
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if (!variable_buffer_data_size)
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return -1;
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xmin = AV_RL32(buf);
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ymin = AV_RL32(buf + 4);
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xmax = AV_RL32(buf + 8);
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ymax = AV_RL32(buf + 12);
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xdelta = (xmax-xmin) + 1;
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buf += variable_buffer_data_size;
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continue;
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}
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// Process the displayWindow variable
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if (check_header_variable(avctx, &buf, buf_end, "displayWindow", "box2i", 34, &variable_buffer_data_size) >= 0) {
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if (!variable_buffer_data_size)
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return -1;
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w = AV_RL32(buf + 8) + 1;
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h = AV_RL32(buf + 12) + 1;
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buf += variable_buffer_data_size;
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continue;
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}
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// Process the lineOrder variable
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if (check_header_variable(avctx, &buf, buf_end, "lineOrder", "lineOrder", 25, &variable_buffer_data_size) >= 0) {
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if (!variable_buffer_data_size)
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return -1;
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if (*buf) {
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av_log(avctx, AV_LOG_ERROR, "Doesn't support this line order : %d\n", *buf);
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return -1;
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}
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buf += variable_buffer_data_size;
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continue;
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}
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// Process the compression variable
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if (check_header_variable(avctx, &buf, buf_end, "compression", "compression", 29, &variable_buffer_data_size) >= 0) {
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if (!variable_buffer_data_size)
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return -1;
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switch (*buf) {
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case EXR_RAW:
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s->compr = *buf;
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break;
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case EXR_RLE:
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case EXR_ZIP1:
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case EXR_ZIP16:
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case EXR_PIZ:
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case EXR_B44:
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default:
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av_log(avctx, AV_LOG_ERROR, "This type of compression is not supported\n");
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return -1;
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}
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buf += variable_buffer_data_size;
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continue;
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}
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// Check if there is enough bytes for a header
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if (buf_end - buf <= 9) {
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av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
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return -1;
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}
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// Process unknown variables
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for (i = 0; i < 2; i++) {
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// Skip variable name/type
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while (++buf < buf_end)
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if (buf[0] == 0x0)
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break;
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}
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buf++;
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// Skip variable length
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if (buf_end - buf >= 5) {
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variable_buffer_data_size = get_header_variable_length(&buf, buf_end);
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if (!variable_buffer_data_size) {
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av_log(avctx, AV_LOG_ERROR, "Incomplete header\n");
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return -1;
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}
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buf += variable_buffer_data_size;
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}
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}
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if (buf >= buf_end) {
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av_log(avctx, AV_LOG_ERROR, "Incomplete frame\n");
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return -1;
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}
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buf++;
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switch (s->bits_per_color_id) {
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case 2: // 32-bit
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case 1: // 16-bit
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if (s->channel_offsets[3] >= 0)
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avctx->pix_fmt = PIX_FMT_RGBA64;
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else
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avctx->pix_fmt = PIX_FMT_RGB48;
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break;
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// 8-bit
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case 0:
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av_log_missing_feature(avctx, "8-bit OpenEXR", 1);
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return -1;
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default:
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av_log(avctx, AV_LOG_ERROR, "Unknown color format : %d\n", s->bits_per_color_id);
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return -1;
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}
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if (s->picture.data[0])
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avctx->release_buffer(avctx, &s->picture);
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if (av_image_check_size(w, h, 0, avctx))
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return -1;
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// Verify the xmin, xmax, ymin, ymax and xdelta before setting the actual image size
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if (xmin > xmax || ymin > ymax || xdelta != xmax - xmin + 1 || xmax >= w || ymax >= h) {
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av_log(avctx, AV_LOG_ERROR, "Wrong sizing or missing size information\n");
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return -1;
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}
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if (w != avctx->width || h != avctx->height) {
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avcodec_set_dimensions(avctx, w, h);
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}
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if (avctx->get_buffer(avctx, p) < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return -1;
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}
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ptr = p->data[0];
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stride = p->linesize[0];
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// Zero out the start if ymin is not 0
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for (y = 0; y < ymin; y++) {
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memset(ptr, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
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ptr += stride;
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}
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// Process the actual lines
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for (y = ymin; y <= ymax; y++) {
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uint16_t *ptr_x = (uint16_t *)ptr;
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if (buf_end - buf > 8) {
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/* Read the lineoffset from the line offset table and add 8 bytes
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to skip the coordinates and data size fields */
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const uint64_t line_offset = bytestream_get_le64(&buf) + 8;
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// Check if the buffer has the required bytes needed from the offset
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if (line_offset > avpkt->size - xdelta * current_channel_offset) {
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// Line offset is probably wrong and not inside the buffer
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av_log(avctx, AV_LOG_WARNING, "Line offset for line %d is out of reach setting it to black\n", y);
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memset(ptr_x, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
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} else {
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const uint8_t *red_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[0];
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const uint8_t *green_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[1];
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const uint8_t *blue_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[2];
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const uint8_t *alpha_channel_buffer = 0;
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if (s->channel_offsets[3] >= 0)
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alpha_channel_buffer = avpkt->data + line_offset + xdelta * s->channel_offsets[3];
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// Zero out the start if xmin is not 0
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memset(ptr_x, 0, xmin * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
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ptr_x += xmin * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components;
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if (s->bits_per_color_id == 2) {
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// 32-bit
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for (x = 0; x < xdelta; x++) {
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*ptr_x++ = exr_flt2uint(bytestream_get_le32(&red_channel_buffer));
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*ptr_x++ = exr_flt2uint(bytestream_get_le32(&green_channel_buffer));
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*ptr_x++ = exr_flt2uint(bytestream_get_le32(&blue_channel_buffer));
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if (alpha_channel_buffer)
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*ptr_x++ = exr_flt2uint(bytestream_get_le32(&alpha_channel_buffer));
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}
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} else {
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// 16-bit
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for (x = 0; x < xdelta; x++) {
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*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&red_channel_buffer));
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*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&green_channel_buffer));
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*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&blue_channel_buffer));
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if (alpha_channel_buffer)
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*ptr_x++ = exr_halflt2uint(bytestream_get_le16(&alpha_channel_buffer));
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}
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}
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// Zero out the end if xmax+1 is not w
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memset(ptr_x, 0, (avctx->width - (xmax + 1)) * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
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ptr_x += (avctx->width - (xmax + 1)) * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components;
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}
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// Move to next line
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ptr += stride;
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}
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}
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// Zero out the end if ymax+1 is not h
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for (y = ymax + 1; y < avctx->height; y++) {
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memset(ptr, 0, avctx->width * 2 * av_pix_fmt_descriptors[avctx->pix_fmt].nb_components);
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ptr += stride;
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}
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*picture = s->picture;
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*data_size = sizeof(AVPicture);
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return buf_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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EXRContext *s = avctx->priv_data;
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avcodec_get_frame_defaults(&s->picture);
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avctx->coded_frame = &s->picture;
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return 0;
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}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
EXRContext *s = avctx->priv_data;
|
|
if (s->picture.data[0])
|
|
avctx->release_buffer(avctx, &s->picture);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_exr_decoder = {
|
|
.name = "exr",
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = CODEC_ID_EXR,
|
|
.priv_data_size = sizeof(EXRContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
.decode = decode_frame,
|
|
.long_name = NULL_IF_CONFIG_SMALL("OpenEXR image"),
|
|
};
|