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/*
* BPG decoder
*
* Copyright (c) 2014 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#ifndef _LIBBPG_H
#define _LIBBPG_H
typedef struct BPGDecoderContext BPGDecoderContext;
typedef enum {
BPG_FORMAT_GRAY,
BPG_FORMAT_420, /* chroma at offset (0.5, 0.5) (JPEG) */
BPG_FORMAT_422, /* chroma at offset (0.5, 0) (JPEG) */
BPG_FORMAT_444,
BPG_FORMAT_420_VIDEO, /* chroma at offset (0, 0.5) (MPEG2) */
BPG_FORMAT_422_VIDEO, /* chroma at offset (0, 0) (MPEG2) */
} BPGImageFormatEnum;
typedef enum {
BPG_CS_YCbCr,
BPG_CS_RGB,
BPG_CS_YCgCo,
BPG_CS_YCbCr_BT709,
BPG_CS_YCbCr_BT2020,
BPG_CS_COUNT,
} BPGColorSpaceEnum;
typedef struct {
uint32_t width;
uint32_t height;
uint8_t format; /* see BPGImageFormatEnum */
uint8_t has_alpha; /* TRUE if an alpha plane is present */
uint8_t color_space; /* see BPGColorSpaceEnum */
uint8_t bit_depth;
uint8_t premultiplied_alpha; /* TRUE if the color is alpha premultiplied */
uint8_t has_w_plane; /* TRUE if a W plane is present (for CMYK encoding) */
uint8_t limited_range; /* TRUE if limited range for the color */
uint8_t has_animation; /* TRUE if the image contains animations */
uint16_t loop_count; /* animations: number of loop, 0 = infinity */
} BPGImageInfo;
typedef enum {
BPG_EXTENSION_TAG_EXIF = 1,
BPG_EXTENSION_TAG_ICCP = 2,
BPG_EXTENSION_TAG_XMP = 3,
BPG_EXTENSION_TAG_THUMBNAIL = 4,
BPG_EXTENSION_TAG_ANIM_CONTROL = 5,
} BPGExtensionTagEnum;
typedef struct BPGExtensionData {
BPGExtensionTagEnum tag;
uint32_t buf_len;
uint8_t *buf;
struct BPGExtensionData *next;
} BPGExtensionData;
typedef enum {
BPG_OUTPUT_FORMAT_RGB24,
BPG_OUTPUT_FORMAT_RGBA32, /* not premultiplied alpha */
BPG_OUTPUT_FORMAT_RGB48,
BPG_OUTPUT_FORMAT_RGBA64, /* not premultiplied alpha */
BPG_OUTPUT_FORMAT_CMYK32,
BPG_OUTPUT_FORMAT_CMYK64,
} BPGDecoderOutputFormat;
#define BPG_DECODER_INFO_BUF_SIZE 16
BPGDecoderContext *bpg_decoder_open(void);
/* If enable is true, extension data are kept during the image
decoding and can be accessed after bpg_decoder_decode() with
bpg_decoder_get_extension(). By default, the extension data are
discarded. */
void bpg_decoder_keep_extension_data(BPGDecoderContext *s, int enable);
/* return 0 if 0K, < 0 if error */
int bpg_decoder_decode(BPGDecoderContext *s, const uint8_t *buf, int buf_len);
/* Return the first element of the extension data list */
BPGExtensionData *bpg_decoder_get_extension_data(BPGDecoderContext *s);
/* return 0 if 0K, < 0 if error */
int bpg_decoder_get_info(BPGDecoderContext *s, BPGImageInfo *p);
/* return 0 if 0K, < 0 if error */
int bpg_decoder_start(BPGDecoderContext *s, BPGDecoderOutputFormat out_fmt);
/* return the frame delay for animations as a fraction (*pnum) / (*pden)
in seconds. In case there is no animation, 0 / 1 is returned. */
void bpg_decoder_get_frame_duration(BPGDecoderContext *s, int *pnum, int *pden);
/* return 0 if 0K, < 0 if error */
int bpg_decoder_get_line(BPGDecoderContext *s, void *buf);
void bpg_decoder_close(BPGDecoderContext *s);
/* only useful for low level access to the image data */
uint8_t *bpg_decoder_get_data(BPGDecoderContext *s, int *pline_size, int plane);
/* Get information from the start of the image data in 'buf' (at least
min(BPG_DECODER_INFO_BUF_SIZE, file_size) bytes must be given).
If pfirst_md != NULL, the extension data are also parsed and the
first element of the list is returned in *pfirst_md. The list must
be freed with bpg_decoder_free_extension_data().
BPGImageInfo.loop_count is only set if extension data are parsed.
Return 0 if OK, < 0 if unrecognized data. */
int bpg_decoder_get_info_from_buf(BPGImageInfo *p,
BPGExtensionData **pfirst_md,
const uint8_t *buf, int buf_len);
/* Free the extension data returned by bpg_decoder_get_info_from_buf() */
void bpg_decoder_free_extension_data(BPGExtensionData *first_md);
#endif /* _LIBBPG_H */