mirror of
https://github.com/Fledge68/WiiFlow_Lite.git
synced 2024-12-18 07:51:53 +01:00
bbf0091922
-plugins now also play videos which have the magic number as name if no specific video was found -switched from libjpeg to the turbojpeg wrapper from libjpeg-turbo to simplify the whole jpeg decoding code by alot -heavly optimized the video decoding code
933 lines
37 KiB
C
933 lines
37 KiB
C
/*
|
|
* Copyright (C)2009-2013 D. R. Commander. All Rights Reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
* - Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
* - Neither the name of the libjpeg-turbo Project nor the names of its
|
|
* contributors may be used to endorse or promote products derived from this
|
|
* software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS",
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef __TURBOJPEG_H__
|
|
#define __TURBOJPEG_H__
|
|
|
|
#if defined(_WIN32) && defined(DLLDEFINE)
|
|
#define DLLEXPORT __declspec(dllexport)
|
|
#else
|
|
#define DLLEXPORT
|
|
#endif
|
|
#define DLLCALL
|
|
|
|
|
|
/**
|
|
* @addtogroup TurboJPEG
|
|
* TurboJPEG API. This API provides an interface for generating, decoding, and
|
|
* transforming planar YUV and JPEG images in memory.
|
|
*
|
|
* @{
|
|
*/
|
|
|
|
|
|
/**
|
|
* The number of chrominance subsampling options
|
|
*/
|
|
#define TJ_NUMSAMP 5
|
|
|
|
/**
|
|
* Chrominance subsampling options.
|
|
* When an image is converted from the RGB to the YCbCr colorspace as part of
|
|
* the JPEG compression process, some of the Cb and Cr (chrominance) components
|
|
* can be discarded or averaged together to produce a smaller image with little
|
|
* perceptible loss of image clarity (the human eye is more sensitive to small
|
|
* changes in brightness than small changes in color.) This is called
|
|
* "chrominance subsampling".
|
|
* <p>
|
|
* NOTE: Technically, the JPEG format uses the YCbCr colorspace, but per the
|
|
* convention of the digital video community, the TurboJPEG API uses "YUV" to
|
|
* refer to an image format consisting of Y, Cb, and Cr image planes.
|
|
*/
|
|
enum TJSAMP
|
|
{
|
|
/**
|
|
* 4:4:4 chrominance subsampling (no chrominance subsampling). The JPEG or
|
|
* YUV image will contain one chrominance component for every pixel in the
|
|
* source image.
|
|
*/
|
|
TJSAMP_444=0,
|
|
/**
|
|
* 4:2:2 chrominance subsampling. The JPEG or YUV image will contain one
|
|
* chrominance component for every 2x1 block of pixels in the source image.
|
|
*/
|
|
TJSAMP_422,
|
|
/**
|
|
* 4:2:0 chrominance subsampling. The JPEG or YUV image will contain one
|
|
* chrominance component for every 2x2 block of pixels in the source image.
|
|
*/
|
|
TJSAMP_420,
|
|
/**
|
|
* Grayscale. The JPEG or YUV image will contain no chrominance components.
|
|
*/
|
|
TJSAMP_GRAY,
|
|
/**
|
|
* 4:4:0 chrominance subsampling. The JPEG or YUV image will contain one
|
|
* chrominance component for every 1x2 block of pixels in the source image.
|
|
* Note that 4:4:0 subsampling is not fully accelerated in libjpeg-turbo.
|
|
*/
|
|
TJSAMP_440
|
|
};
|
|
|
|
/**
|
|
* MCU block width (in pixels) for a given level of chrominance subsampling.
|
|
* MCU block sizes:
|
|
* - 8x8 for no subsampling or grayscale
|
|
* - 16x8 for 4:2:2
|
|
* - 8x16 for 4:4:0
|
|
* - 16x16 for 4:2:0
|
|
*/
|
|
static const int tjMCUWidth[TJ_NUMSAMP] = {8, 16, 16, 8, 8};
|
|
|
|
/**
|
|
* MCU block height (in pixels) for a given level of chrominance subsampling.
|
|
* MCU block sizes:
|
|
* - 8x8 for no subsampling or grayscale
|
|
* - 16x8 for 4:2:2
|
|
* - 8x16 for 4:4:0
|
|
* - 16x16 for 4:2:0
|
|
*/
|
|
static const int tjMCUHeight[TJ_NUMSAMP] = {8, 8, 16, 8, 16};
|
|
|
|
|
|
/**
|
|
* The number of pixel formats
|
|
*/
|
|
#define TJ_NUMPF 11
|
|
|
|
/**
|
|
* Pixel formats
|
|
*/
|
|
enum TJPF
|
|
{
|
|
/**
|
|
* RGB pixel format. The red, green, and blue components in the image are
|
|
* stored in 3-byte pixels in the order R, G, B from lowest to highest byte
|
|
* address within each pixel.
|
|
*/
|
|
TJPF_RGB=0,
|
|
/**
|
|
* BGR pixel format. The red, green, and blue components in the image are
|
|
* stored in 3-byte pixels in the order B, G, R from lowest to highest byte
|
|
* address within each pixel.
|
|
*/
|
|
TJPF_BGR,
|
|
/**
|
|
* RGBX pixel format. The red, green, and blue components in the image are
|
|
* stored in 4-byte pixels in the order R, G, B from lowest to highest byte
|
|
* address within each pixel. The X component is ignored when compressing
|
|
* and undefined when decompressing.
|
|
*/
|
|
TJPF_RGBX,
|
|
/**
|
|
* BGRX pixel format. The red, green, and blue components in the image are
|
|
* stored in 4-byte pixels in the order B, G, R from lowest to highest byte
|
|
* address within each pixel. The X component is ignored when compressing
|
|
* and undefined when decompressing.
|
|
*/
|
|
TJPF_BGRX,
|
|
/**
|
|
* XBGR pixel format. The red, green, and blue components in the image are
|
|
* stored in 4-byte pixels in the order R, G, B from highest to lowest byte
|
|
* address within each pixel. The X component is ignored when compressing
|
|
* and undefined when decompressing.
|
|
*/
|
|
TJPF_XBGR,
|
|
/**
|
|
* XRGB pixel format. The red, green, and blue components in the image are
|
|
* stored in 4-byte pixels in the order B, G, R from highest to lowest byte
|
|
* address within each pixel. The X component is ignored when compressing
|
|
* and undefined when decompressing.
|
|
*/
|
|
TJPF_XRGB,
|
|
/**
|
|
* Grayscale pixel format. Each 1-byte pixel represents a luminance
|
|
* (brightness) level from 0 to 255.
|
|
*/
|
|
TJPF_GRAY,
|
|
/**
|
|
* RGBA pixel format. This is the same as @ref TJPF_RGBX, except that when
|
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
|
* interpreted as an opaque alpha channel.
|
|
*/
|
|
TJPF_RGBA,
|
|
/**
|
|
* BGRA pixel format. This is the same as @ref TJPF_BGRX, except that when
|
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
|
* interpreted as an opaque alpha channel.
|
|
*/
|
|
TJPF_BGRA,
|
|
/**
|
|
* ABGR pixel format. This is the same as @ref TJPF_XBGR, except that when
|
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
|
* interpreted as an opaque alpha channel.
|
|
*/
|
|
TJPF_ABGR,
|
|
/**
|
|
* ARGB pixel format. This is the same as @ref TJPF_XRGB, except that when
|
|
* decompressing, the X component is guaranteed to be 0xFF, which can be
|
|
* interpreted as an opaque alpha channel.
|
|
*/
|
|
TJPF_ARGB
|
|
};
|
|
|
|
/**
|
|
* Red offset (in bytes) for a given pixel format. This specifies the number
|
|
* of bytes that the red component is offset from the start of the pixel. For
|
|
* instance, if a pixel of format TJ_BGRX is stored in <tt>char pixel[]</tt>,
|
|
* then the red component will be <tt>pixel[tjRedOffset[TJ_BGRX]]</tt>.
|
|
*/
|
|
static const int tjRedOffset[TJ_NUMPF] = {0, 2, 0, 2, 3, 1, 0, 0, 2, 3, 1};
|
|
/**
|
|
* Green offset (in bytes) for a given pixel format. This specifies the number
|
|
* of bytes that the green component is offset from the start of the pixel.
|
|
* For instance, if a pixel of format TJ_BGRX is stored in
|
|
* <tt>char pixel[]</tt>, then the green component will be
|
|
* <tt>pixel[tjGreenOffset[TJ_BGRX]]</tt>.
|
|
*/
|
|
static const int tjGreenOffset[TJ_NUMPF] = {1, 1, 1, 1, 2, 2, 0, 1, 1, 2, 2};
|
|
/**
|
|
* Blue offset (in bytes) for a given pixel format. This specifies the number
|
|
* of bytes that the Blue component is offset from the start of the pixel. For
|
|
* instance, if a pixel of format TJ_BGRX is stored in <tt>char pixel[]</tt>,
|
|
* then the blue component will be <tt>pixel[tjBlueOffset[TJ_BGRX]]</tt>.
|
|
*/
|
|
static const int tjBlueOffset[TJ_NUMPF] = {2, 0, 2, 0, 1, 3, 0, 2, 0, 1, 3};
|
|
|
|
/**
|
|
* Pixel size (in bytes) for a given pixel format.
|
|
*/
|
|
static const int tjPixelSize[TJ_NUMPF] = {3, 3, 4, 4, 4, 4, 1, 4, 4, 4, 4};
|
|
|
|
|
|
/**
|
|
* The uncompressed source/destination image is stored in bottom-up (Windows,
|
|
* OpenGL) order, not top-down (X11) order.
|
|
*/
|
|
#define TJFLAG_BOTTOMUP 2
|
|
/**
|
|
* Turn off CPU auto-detection and force TurboJPEG to use MMX code (if the
|
|
* underlying codec supports it.)
|
|
*/
|
|
#define TJFLAG_FORCEMMX 8
|
|
/**
|
|
* Turn off CPU auto-detection and force TurboJPEG to use SSE code (if the
|
|
* underlying codec supports it.)
|
|
*/
|
|
#define TJFLAG_FORCESSE 16
|
|
/**
|
|
* Turn off CPU auto-detection and force TurboJPEG to use SSE2 code (if the
|
|
* underlying codec supports it.)
|
|
*/
|
|
#define TJFLAG_FORCESSE2 32
|
|
/**
|
|
* Turn off CPU auto-detection and force TurboJPEG to use SSE3 code (if the
|
|
* underlying codec supports it.)
|
|
*/
|
|
#define TJFLAG_FORCESSE3 128
|
|
/**
|
|
* When decompressing an image that was compressed using chrominance
|
|
* subsampling, use the fastest chrominance upsampling algorithm available in
|
|
* the underlying codec. The default is to use smooth upsampling, which
|
|
* creates a smooth transition between neighboring chrominance components in
|
|
* order to reduce upsampling artifacts in the decompressed image.
|
|
*/
|
|
#define TJFLAG_FASTUPSAMPLE 256
|
|
/**
|
|
* Disable buffer (re)allocation. If passed to #tjCompress2() or
|
|
* #tjTransform(), this flag will cause those functions to generate an error if
|
|
* the JPEG image buffer is invalid or too small rather than attempting to
|
|
* allocate or reallocate that buffer. This reproduces the behavior of earlier
|
|
* versions of TurboJPEG.
|
|
*/
|
|
#define TJFLAG_NOREALLOC 1024
|
|
/**
|
|
* Use the fastest DCT/IDCT algorithm available in the underlying codec. The
|
|
* default if this flag is not specified is implementation-specific. For
|
|
* example, the implementation of TurboJPEG for libjpeg[-turbo] uses the fast
|
|
* algorithm by default when compressing, because this has been shown to have
|
|
* only a very slight effect on accuracy, but it uses the accurate algorithm
|
|
* when decompressing, because this has been shown to have a larger effect.
|
|
*/
|
|
#define TJFLAG_FASTDCT 2048
|
|
/**
|
|
* Use the most accurate DCT/IDCT algorithm available in the underlying codec.
|
|
* The default if this flag is not specified is implementation-specific. For
|
|
* example, the implementation of TurboJPEG for libjpeg[-turbo] uses the fast
|
|
* algorithm by default when compressing, because this has been shown to have
|
|
* only a very slight effect on accuracy, but it uses the accurate algorithm
|
|
* when decompressing, because this has been shown to have a larger effect.
|
|
*/
|
|
#define TJFLAG_ACCURATEDCT 4096
|
|
|
|
|
|
/**
|
|
* The number of transform operations
|
|
*/
|
|
#define TJ_NUMXOP 8
|
|
|
|
/**
|
|
* Transform operations for #tjTransform()
|
|
*/
|
|
enum TJXOP
|
|
{
|
|
/**
|
|
* Do not transform the position of the image pixels
|
|
*/
|
|
TJXOP_NONE=0,
|
|
/**
|
|
* Flip (mirror) image horizontally. This transform is imperfect if there
|
|
* are any partial MCU blocks on the right edge (see #TJXOPT_PERFECT.)
|
|
*/
|
|
TJXOP_HFLIP,
|
|
/**
|
|
* Flip (mirror) image vertically. This transform is imperfect if there are
|
|
* any partial MCU blocks on the bottom edge (see #TJXOPT_PERFECT.)
|
|
*/
|
|
TJXOP_VFLIP,
|
|
/**
|
|
* Transpose image (flip/mirror along upper left to lower right axis.) This
|
|
* transform is always perfect.
|
|
*/
|
|
TJXOP_TRANSPOSE,
|
|
/**
|
|
* Transverse transpose image (flip/mirror along upper right to lower left
|
|
* axis.) This transform is imperfect if there are any partial MCU blocks in
|
|
* the image (see #TJXOPT_PERFECT.)
|
|
*/
|
|
TJXOP_TRANSVERSE,
|
|
/**
|
|
* Rotate image clockwise by 90 degrees. This transform is imperfect if
|
|
* there are any partial MCU blocks on the bottom edge (see
|
|
* #TJXOPT_PERFECT.)
|
|
*/
|
|
TJXOP_ROT90,
|
|
/**
|
|
* Rotate image 180 degrees. This transform is imperfect if there are any
|
|
* partial MCU blocks in the image (see #TJXOPT_PERFECT.)
|
|
*/
|
|
TJXOP_ROT180,
|
|
/**
|
|
* Rotate image counter-clockwise by 90 degrees. This transform is imperfect
|
|
* if there are any partial MCU blocks on the right edge (see
|
|
* #TJXOPT_PERFECT.)
|
|
*/
|
|
TJXOP_ROT270
|
|
};
|
|
|
|
|
|
/**
|
|
* This option will cause #tjTransform() to return an error if the transform is
|
|
* not perfect. Lossless transforms operate on MCU blocks, whose size depends
|
|
* on the level of chrominance subsampling used (see #tjMCUWidth
|
|
* and #tjMCUHeight.) If the image's width or height is not evenly divisible
|
|
* by the MCU block size, then there will be partial MCU blocks on the right
|
|
* and/or bottom edges. It is not possible to move these partial MCU blocks to
|
|
* the top or left of the image, so any transform that would require that is
|
|
* "imperfect." If this option is not specified, then any partial MCU blocks
|
|
* that cannot be transformed will be left in place, which will create
|
|
* odd-looking strips on the right or bottom edge of the image.
|
|
*/
|
|
#define TJXOPT_PERFECT 1
|
|
/**
|
|
* This option will cause #tjTransform() to discard any partial MCU blocks that
|
|
* cannot be transformed.
|
|
*/
|
|
#define TJXOPT_TRIM 2
|
|
/**
|
|
* This option will enable lossless cropping. See #tjTransform() for more
|
|
* information.
|
|
*/
|
|
#define TJXOPT_CROP 4
|
|
/**
|
|
* This option will discard the color data in the input image and produce
|
|
* a grayscale output image.
|
|
*/
|
|
#define TJXOPT_GRAY 8
|
|
/**
|
|
* This option will prevent #tjTransform() from outputting a JPEG image for
|
|
* this particular transform (this can be used in conjunction with a custom
|
|
* filter to capture the transformed DCT coefficients without transcoding
|
|
* them.)
|
|
*/
|
|
#define TJXOPT_NOOUTPUT 16
|
|
|
|
|
|
/**
|
|
* Scaling factor
|
|
*/
|
|
typedef struct
|
|
{
|
|
/**
|
|
* Numerator
|
|
*/
|
|
int num;
|
|
/**
|
|
* Denominator
|
|
*/
|
|
int denom;
|
|
} tjscalingfactor;
|
|
|
|
/**
|
|
* Cropping region
|
|
*/
|
|
typedef struct
|
|
{
|
|
/**
|
|
* The left boundary of the cropping region. This must be evenly divisible
|
|
* by the MCU block width (see #tjMCUWidth.)
|
|
*/
|
|
int x;
|
|
/**
|
|
* The upper boundary of the cropping region. This must be evenly divisible
|
|
* by the MCU block height (see #tjMCUHeight.)
|
|
*/
|
|
int y;
|
|
/**
|
|
* The width of the cropping region. Setting this to 0 is the equivalent of
|
|
* setting it to the width of the source JPEG image - x.
|
|
*/
|
|
int w;
|
|
/**
|
|
* The height of the cropping region. Setting this to 0 is the equivalent of
|
|
* setting it to the height of the source JPEG image - y.
|
|
*/
|
|
int h;
|
|
} tjregion;
|
|
|
|
/**
|
|
* Lossless transform
|
|
*/
|
|
typedef struct tjtransform
|
|
{
|
|
/**
|
|
* Cropping region
|
|
*/
|
|
tjregion r;
|
|
/**
|
|
* One of the @ref TJXOP "transform operations"
|
|
*/
|
|
int op;
|
|
/**
|
|
* The bitwise OR of one of more of the @ref TJXOPT_CROP "transform options"
|
|
*/
|
|
int options;
|
|
/**
|
|
* Arbitrary data that can be accessed within the body of the callback
|
|
* function
|
|
*/
|
|
void *data;
|
|
/**
|
|
* A callback function that can be used to modify the DCT coefficients
|
|
* after they are losslessly transformed but before they are transcoded to a
|
|
* new JPEG image. This allows for custom filters or other transformations
|
|
* to be applied in the frequency domain.
|
|
*
|
|
* @param coeffs pointer to an array of transformed DCT coefficients. (NOTE:
|
|
* this pointer is not guaranteed to be valid once the callback
|
|
* returns, so applications wishing to hand off the DCT coefficients
|
|
* to another function or library should make a copy of them within
|
|
* the body of the callback.)
|
|
* @param arrayRegion #tjregion structure containing the width and height of
|
|
* the array pointed to by <tt>coeffs</tt> as well as its offset
|
|
* relative to the component plane. TurboJPEG implementations may
|
|
* choose to split each component plane into multiple DCT coefficient
|
|
* arrays and call the callback function once for each array.
|
|
* @param planeRegion #tjregion structure containing the width and height of
|
|
* the component plane to which <tt>coeffs</tt> belongs
|
|
* @param componentID ID number of the component plane to which
|
|
* <tt>coeffs</tt> belongs (Y, Cb, and Cr have, respectively, ID's of
|
|
* 0, 1, and 2 in typical JPEG images.)
|
|
* @param transformID ID number of the transformed image to which
|
|
* <tt>coeffs</tt> belongs. This is the same as the index of the
|
|
* transform in the <tt>transforms</tt> array that was passed to
|
|
* #tjTransform().
|
|
* @param transform a pointer to a #tjtransform structure that specifies the
|
|
* parameters and/or cropping region for this transform
|
|
*
|
|
* @return 0 if the callback was successful, or -1 if an error occurred.
|
|
*/
|
|
int (*customFilter)(short *coeffs, tjregion arrayRegion,
|
|
tjregion planeRegion, int componentIndex, int transformIndex,
|
|
struct tjtransform *transform);
|
|
} tjtransform;
|
|
|
|
/**
|
|
* TurboJPEG instance handle
|
|
*/
|
|
typedef void* tjhandle;
|
|
|
|
|
|
/**
|
|
* Pad the given width to the nearest 32-bit boundary
|
|
*/
|
|
#define TJPAD(width) (((width)+3)&(~3))
|
|
|
|
/**
|
|
* Compute the scaled value of <tt>dimension</tt> using the given scaling
|
|
* factor. This macro performs the integer equivalent of <tt>ceil(dimension *
|
|
* scalingFactor)</tt>.
|
|
*/
|
|
#define TJSCALED(dimension, scalingFactor) ((dimension * scalingFactor.num \
|
|
+ scalingFactor.denom - 1) / scalingFactor.denom)
|
|
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
|
|
/**
|
|
* Create a TurboJPEG compressor instance.
|
|
*
|
|
* @return a handle to the newly-created instance, or NULL if an error
|
|
* occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT tjhandle DLLCALL tjInitCompress(void);
|
|
|
|
|
|
/**
|
|
* Compress an RGB or grayscale image into a JPEG image.
|
|
*
|
|
* @param handle a handle to a TurboJPEG compressor or transformer instance
|
|
* @param srcBuf pointer to an image buffer containing RGB or grayscale pixels
|
|
* to be compressed
|
|
* @param width width (in pixels) of the source image
|
|
* @param pitch bytes per line of the source image. Normally, this should be
|
|
* <tt>width * #tjPixelSize[pixelFormat]</tt> if the image is unpadded,
|
|
* or <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each line of
|
|
* the image is padded to the nearest 32-bit boundary, as is the case
|
|
* for Windows bitmaps. You can also be clever and use this parameter
|
|
* to skip lines, etc. Setting this parameter to 0 is the equivalent of
|
|
* setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
|
* @param height height (in pixels) of the source image
|
|
* @param pixelFormat pixel format of the source image (see @ref TJPF
|
|
* "Pixel formats".)
|
|
* @param jpegBuf address of a pointer to an image buffer that will receive the
|
|
* JPEG image. TurboJPEG has the ability to reallocate the JPEG buffer
|
|
* to accommodate the size of the JPEG image. Thus, you can choose to:
|
|
* -# pre-allocate the JPEG buffer with an arbitrary size using
|
|
* #tjAlloc() and let TurboJPEG grow the buffer as needed,
|
|
* -# set <tt>*jpegBuf</tt> to NULL to tell TurboJPEG to allocate the
|
|
* buffer for you, or
|
|
* -# pre-allocate the buffer to a "worst case" size determined by
|
|
* calling #tjBufSize(). This should ensure that the buffer never has
|
|
* to be re-allocated (setting #TJFLAG_NOREALLOC guarantees this.)
|
|
* .
|
|
* If you choose option 1, <tt>*jpegSize</tt> should be set to the
|
|
* size of your pre-allocated buffer. In any case, unless you have
|
|
* set #TJFLAG_NOREALLOC, you should always check <tt>*jpegBuf</tt> upon
|
|
* return from this function, as it may have changed.
|
|
* @param jpegSize pointer to an unsigned long variable that holds the size of
|
|
* the JPEG image buffer. If <tt>*jpegBuf</tt> points to a
|
|
* pre-allocated buffer, then <tt>*jpegSize</tt> should be set to the
|
|
* size of the buffer. Upon return, <tt>*jpegSize</tt> will contain the
|
|
* size of the JPEG image (in bytes.)
|
|
* @param jpegSubsamp the level of chrominance subsampling to be used when
|
|
* generating the JPEG image (see @ref TJSAMP
|
|
* "Chrominance subsampling options".)
|
|
* @param jpegQual the image quality of the generated JPEG image (1 = worst,
|
|
100 = best)
|
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP
|
|
* "flags".
|
|
*
|
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT int DLLCALL tjCompress2(tjhandle handle, unsigned char *srcBuf,
|
|
int width, int pitch, int height, int pixelFormat, unsigned char **jpegBuf,
|
|
unsigned long *jpegSize, int jpegSubsamp, int jpegQual, int flags);
|
|
|
|
|
|
/**
|
|
* The maximum size of the buffer (in bytes) required to hold a JPEG image with
|
|
* the given parameters. The number of bytes returned by this function is
|
|
* larger than the size of the uncompressed source image. The reason for this
|
|
* is that the JPEG format uses 16-bit coefficients, and it is thus possible
|
|
* for a very high-quality JPEG image with very high-frequency content to
|
|
* expand rather than compress when converted to the JPEG format. Such images
|
|
* represent a very rare corner case, but since there is no way to predict the
|
|
* size of a JPEG image prior to compression, the corner case has to be
|
|
* handled.
|
|
*
|
|
* @param width width of the image (in pixels)
|
|
* @param height height of the image (in pixels)
|
|
* @param jpegSubsamp the level of chrominance subsampling to be used when
|
|
* generating the JPEG image (see @ref TJSAMP
|
|
* "Chrominance subsampling options".)
|
|
*
|
|
* @return the maximum size of the buffer (in bytes) required to hold the
|
|
* image, or -1 if the arguments are out of bounds.
|
|
*/
|
|
DLLEXPORT unsigned long DLLCALL tjBufSize(int width, int height,
|
|
int jpegSubsamp);
|
|
|
|
|
|
/**
|
|
* The size of the buffer (in bytes) required to hold a YUV planar image with
|
|
* the given parameters.
|
|
*
|
|
* @param width width of the image (in pixels)
|
|
* @param height height of the image (in pixels)
|
|
* @param subsamp level of chrominance subsampling in the image (see
|
|
* @ref TJSAMP "Chrominance subsampling options".)
|
|
*
|
|
* @return the size of the buffer (in bytes) required to hold the image, or
|
|
* -1 if the arguments are out of bounds.
|
|
*/
|
|
DLLEXPORT unsigned long DLLCALL tjBufSizeYUV(int width, int height,
|
|
int subsamp);
|
|
|
|
|
|
/**
|
|
* Encode an RGB or grayscale image into a YUV planar image. This function
|
|
* uses the accelerated color conversion routines in TurboJPEG's underlying
|
|
* codec to produce a planar YUV image that is suitable for X Video.
|
|
* Specifically, if the chrominance components are subsampled along the
|
|
* horizontal dimension, then the width of the luminance plane is padded to the
|
|
* nearest multiple of 2 in the output image (same goes for the height of the
|
|
* luminance plane, if the chrominance components are subsampled along the
|
|
* vertical dimension.) Also, each line of each plane in the output image is
|
|
* padded to 4 bytes. Although this will work with any subsampling option, it
|
|
* is really only useful in combination with TJ_420, which produces an image
|
|
* compatible with the I420 (AKA "YUV420P") format.
|
|
* <p>
|
|
* NOTE: Technically, the JPEG format uses the YCbCr colorspace, but per the
|
|
* convention of the digital video community, the TurboJPEG API uses "YUV" to
|
|
* refer to an image format consisting of Y, Cb, and Cr image planes.
|
|
*
|
|
* @param handle a handle to a TurboJPEG compressor or transformer instance
|
|
* @param srcBuf pointer to an image buffer containing RGB or grayscale pixels
|
|
* to be encoded
|
|
* @param width width (in pixels) of the source image
|
|
* @param pitch bytes per line of the source image. Normally, this should be
|
|
* <tt>width * #tjPixelSize[pixelFormat]</tt> if the image is unpadded,
|
|
* or <tt>#TJPAD(width * #tjPixelSize[pixelFormat])</tt> if each line of
|
|
* the image is padded to the nearest 32-bit boundary, as is the case
|
|
* for Windows bitmaps. You can also be clever and use this parameter
|
|
* to skip lines, etc. Setting this parameter to 0 is the equivalent of
|
|
* setting it to <tt>width * #tjPixelSize[pixelFormat]</tt>.
|
|
* @param height height (in pixels) of the source image
|
|
* @param pixelFormat pixel format of the source image (see @ref TJPF
|
|
* "Pixel formats".)
|
|
* @param dstBuf pointer to an image buffer that will receive the YUV image.
|
|
* Use #tjBufSizeYUV() to determine the appropriate size for this buffer
|
|
* based on the image width, height, and level of chrominance
|
|
* subsampling.
|
|
* @param subsamp the level of chrominance subsampling to be used when
|
|
* generating the YUV image (see @ref TJSAMP
|
|
* "Chrominance subsampling options".)
|
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP
|
|
* "flags".
|
|
*
|
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT int DLLCALL tjEncodeYUV2(tjhandle handle,
|
|
unsigned char *srcBuf, int width, int pitch, int height, int pixelFormat,
|
|
unsigned char *dstBuf, int subsamp, int flags);
|
|
|
|
|
|
/**
|
|
* Create a TurboJPEG decompressor instance.
|
|
*
|
|
* @return a handle to the newly-created instance, or NULL if an error
|
|
* occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT tjhandle DLLCALL tjInitDecompress(void);
|
|
|
|
|
|
/**
|
|
* Retrieve information about a JPEG image without decompressing it.
|
|
*
|
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
|
* @param jpegBuf pointer to a buffer containing a JPEG image
|
|
* @param jpegSize size of the JPEG image (in bytes)
|
|
* @param width pointer to an integer variable that will receive the width (in
|
|
* pixels) of the JPEG image
|
|
* @param height pointer to an integer variable that will receive the height
|
|
* (in pixels) of the JPEG image
|
|
* @param jpegSubsamp pointer to an integer variable that will receive the
|
|
* level of chrominance subsampling used when compressing the JPEG image
|
|
* (see @ref TJSAMP "Chrominance subsampling options".)
|
|
*
|
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT int DLLCALL tjDecompressHeader2(tjhandle handle,
|
|
unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height,
|
|
int *jpegSubsamp);
|
|
|
|
|
|
/**
|
|
* Returns a list of fractional scaling factors that the JPEG decompressor in
|
|
* this implementation of TurboJPEG supports.
|
|
*
|
|
* @param numscalingfactors pointer to an integer variable that will receive
|
|
* the number of elements in the list
|
|
*
|
|
* @return a pointer to a list of fractional scaling factors, or NULL if an
|
|
* error is encountered (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT tjscalingfactor* DLLCALL tjGetScalingFactors(int *numscalingfactors);
|
|
|
|
|
|
/**
|
|
* Decompress a JPEG image to an RGB or grayscale image.
|
|
*
|
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
|
* @param jpegBuf pointer to a buffer containing the JPEG image to decompress
|
|
* @param jpegSize size of the JPEG image (in bytes)
|
|
* @param dstBuf pointer to an image buffer that will receive the decompressed
|
|
* image. This buffer should normally be <tt>pitch * scaledHeight</tt>
|
|
* bytes in size, where <tt>scaledHeight</tt> can be determined by
|
|
* calling #TJSCALED() with the JPEG image height and one of the scaling
|
|
* factors returned by #tjGetScalingFactors(). The <tt>dstBuf</tt>
|
|
* pointer may also be used to decompress into a specific region of a
|
|
* larger buffer.
|
|
* @param width desired width (in pixels) of the destination image. If this is
|
|
* different than the width of the JPEG image being decompressed, then
|
|
* TurboJPEG will use scaling in the JPEG decompressor to generate the
|
|
* largest possible image that will fit within the desired width. If
|
|
* <tt>width</tt> is set to 0, then only the height will be considered
|
|
* when determining the scaled image size.
|
|
* @param pitch bytes per line of the destination image. Normally, this is
|
|
* <tt>scaledWidth * #tjPixelSize[pixelFormat]</tt> if the decompressed
|
|
* image is unpadded, else <tt>#TJPAD(scaledWidth *
|
|
* #tjPixelSize[pixelFormat])</tt> if each line of the decompressed
|
|
* image is padded to the nearest 32-bit boundary, as is the case for
|
|
* Windows bitmaps. (NOTE: <tt>scaledWidth</tt> can be determined by
|
|
* calling #TJSCALED() with the JPEG image width and one of the scaling
|
|
* factors returned by #tjGetScalingFactors().) You can also be clever
|
|
* and use the pitch parameter to skip lines, etc. Setting this
|
|
* parameter to 0 is the equivalent of setting it to <tt>scaledWidth
|
|
* * #tjPixelSize[pixelFormat]</tt>.
|
|
* @param height desired height (in pixels) of the destination image. If this
|
|
* is different than the height of the JPEG image being decompressed,
|
|
* then TurboJPEG will use scaling in the JPEG decompressor to generate
|
|
* the largest possible image that will fit within the desired height.
|
|
* If <tt>height</tt> is set to 0, then only the width will be
|
|
* considered when determining the scaled image size.
|
|
* @param pixelFormat pixel format of the destination image (see @ref
|
|
* TJPF "Pixel formats".)
|
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP
|
|
* "flags".
|
|
*
|
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT int DLLCALL tjDecompress2(tjhandle handle,
|
|
unsigned char *jpegBuf, unsigned long jpegSize, unsigned char *dstBuf,
|
|
int width, int pitch, int height, int pixelFormat, int flags);
|
|
|
|
|
|
/**
|
|
* Decompress a JPEG image to a YUV planar image. This function performs JPEG
|
|
* decompression but leaves out the color conversion step, so a planar YUV
|
|
* image is generated instead of an RGB image. The padding of the planes in
|
|
* this image is the same as in the images generated by #tjEncodeYUV2(). Note
|
|
* that, if the width or height of the image is not an even multiple of the MCU
|
|
* block size (see #tjMCUWidth and #tjMCUHeight), then an intermediate buffer
|
|
* copy will be performed within TurboJPEG.
|
|
* <p>
|
|
* NOTE: Technically, the JPEG format uses the YCbCr colorspace, but per the
|
|
* convention of the digital video community, the TurboJPEG API uses "YUV" to
|
|
* refer to an image format consisting of Y, Cb, and Cr image planes.
|
|
*
|
|
* @param handle a handle to a TurboJPEG decompressor or transformer instance
|
|
* @param jpegBuf pointer to a buffer containing the JPEG image to decompress
|
|
* @param jpegSize size of the JPEG image (in bytes)
|
|
* @param dstBuf pointer to an image buffer that will receive the YUV image.
|
|
* Use #tjBufSizeYUV() to determine the appropriate size for this buffer
|
|
* based on the image width, height, and level of subsampling.
|
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP
|
|
* "flags".
|
|
*
|
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT int DLLCALL tjDecompressToYUV(tjhandle handle,
|
|
unsigned char *jpegBuf, unsigned long jpegSize, unsigned char *dstBuf,
|
|
int flags);
|
|
|
|
|
|
/**
|
|
* Create a new TurboJPEG transformer instance.
|
|
*
|
|
* @return a handle to the newly-created instance, or NULL if an error
|
|
* occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT tjhandle DLLCALL tjInitTransform(void);
|
|
|
|
|
|
/**
|
|
* Losslessly transform a JPEG image into another JPEG image. Lossless
|
|
* transforms work by moving the raw coefficients from one JPEG image structure
|
|
* to another without altering the values of the coefficients. While this is
|
|
* typically faster than decompressing the image, transforming it, and
|
|
* re-compressing it, lossless transforms are not free. Each lossless
|
|
* transform requires reading and performing Huffman decoding on all of the
|
|
* coefficients in the source image, regardless of the size of the destination
|
|
* image. Thus, this function provides a means of generating multiple
|
|
* transformed images from the same source or applying multiple
|
|
* transformations simultaneously, in order to eliminate the need to read the
|
|
* source coefficients multiple times.
|
|
*
|
|
* @param handle a handle to a TurboJPEG transformer instance
|
|
* @param jpegBuf pointer to a buffer containing the JPEG image to transform
|
|
* @param jpegSize size of the JPEG image (in bytes)
|
|
* @param n the number of transformed JPEG images to generate
|
|
* @param dstBufs pointer to an array of n image buffers. <tt>dstBufs[i]</tt>
|
|
* will receive a JPEG image that has been transformed using the
|
|
* parameters in <tt>transforms[i]</tt>. TurboJPEG has the ability to
|
|
* reallocate the JPEG buffer to accommodate the size of the JPEG image.
|
|
* Thus, you can choose to:
|
|
* -# pre-allocate the JPEG buffer with an arbitrary size using
|
|
* #tjAlloc() and let TurboJPEG grow the buffer as needed,
|
|
* -# set <tt>dstBufs[i]</tt> to NULL to tell TurboJPEG to allocate the
|
|
* buffer for you, or
|
|
* -# pre-allocate the buffer to a "worst case" size determined by
|
|
* calling #tjBufSize() with the transformed or cropped width and
|
|
* height. This should ensure that the buffer never has to be
|
|
* re-allocated (setting #TJFLAG_NOREALLOC guarantees this.)
|
|
* .
|
|
* If you choose option 1, <tt>dstSizes[i]</tt> should be set to
|
|
* the size of your pre-allocated buffer. In any case, unless you have
|
|
* set #TJFLAG_NOREALLOC, you should always check <tt>dstBufs[i]</tt>
|
|
* upon return from this function, as it may have changed.
|
|
* @param dstSizes pointer to an array of n unsigned long variables that will
|
|
* receive the actual sizes (in bytes) of each transformed JPEG image.
|
|
* If <tt>dstBufs[i]</tt> points to a pre-allocated buffer, then
|
|
* <tt>dstSizes[i]</tt> should be set to the size of the buffer. Upon
|
|
* return, <tt>dstSizes[i]</tt> will contain the size of the JPEG image
|
|
* (in bytes.)
|
|
* @param transforms pointer to an array of n #tjtransform structures, each of
|
|
* which specifies the transform parameters and/or cropping region for
|
|
* the corresponding transformed output image.
|
|
* @param flags the bitwise OR of one or more of the @ref TJFLAG_BOTTOMUP
|
|
* "flags".
|
|
*
|
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT int DLLCALL tjTransform(tjhandle handle, unsigned char *jpegBuf,
|
|
unsigned long jpegSize, int n, unsigned char **dstBufs,
|
|
unsigned long *dstSizes, tjtransform *transforms, int flags);
|
|
|
|
|
|
/**
|
|
* Destroy a TurboJPEG compressor, decompressor, or transformer instance.
|
|
*
|
|
* @param handle a handle to a TurboJPEG compressor, decompressor or
|
|
* transformer instance
|
|
*
|
|
* @return 0 if successful, or -1 if an error occurred (see #tjGetErrorStr().)
|
|
*/
|
|
DLLEXPORT int DLLCALL tjDestroy(tjhandle handle);
|
|
|
|
|
|
/**
|
|
* Allocate an image buffer for use with TurboJPEG. You should always use
|
|
* this function to allocate the JPEG destination buffer(s) for #tjCompress2()
|
|
* and #tjTransform() unless you are disabling automatic buffer
|
|
* (re)allocation (by setting #TJFLAG_NOREALLOC.)
|
|
*
|
|
* @param bytes the number of bytes to allocate
|
|
*
|
|
* @return a pointer to a newly-allocated buffer with the specified number of
|
|
* bytes
|
|
*
|
|
* @sa tjFree()
|
|
*/
|
|
DLLEXPORT unsigned char* DLLCALL tjAlloc(int bytes);
|
|
|
|
|
|
/**
|
|
* Free an image buffer previously allocated by TurboJPEG. You should always
|
|
* use this function to free JPEG destination buffer(s) that were automatically
|
|
* (re)allocated by #tjCompress2() or #tjTransform() or that were manually
|
|
* allocated using #tjAlloc().
|
|
*
|
|
* @param buffer address of the buffer to free
|
|
*
|
|
* @sa tjAlloc()
|
|
*/
|
|
DLLEXPORT void DLLCALL tjFree(unsigned char *buffer);
|
|
|
|
|
|
/**
|
|
* Returns a descriptive error message explaining why the last command failed.
|
|
*
|
|
* @return a descriptive error message explaining why the last command failed.
|
|
*/
|
|
DLLEXPORT char* DLLCALL tjGetErrorStr(void);
|
|
|
|
|
|
/* Backward compatibility functions and macros (nothing to see here) */
|
|
#define NUMSUBOPT TJ_NUMSAMP
|
|
#define TJ_444 TJSAMP_444
|
|
#define TJ_422 TJSAMP_422
|
|
#define TJ_420 TJSAMP_420
|
|
#define TJ_411 TJSAMP_420
|
|
#define TJ_GRAYSCALE TJSAMP_GRAY
|
|
|
|
#define TJ_BGR 1
|
|
#define TJ_BOTTOMUP TJFLAG_BOTTOMUP
|
|
#define TJ_FORCEMMX TJFLAG_FORCEMMX
|
|
#define TJ_FORCESSE TJFLAG_FORCESSE
|
|
#define TJ_FORCESSE2 TJFLAG_FORCESSE2
|
|
#define TJ_ALPHAFIRST 64
|
|
#define TJ_FORCESSE3 TJFLAG_FORCESSE3
|
|
#define TJ_FASTUPSAMPLE TJFLAG_FASTUPSAMPLE
|
|
#define TJ_YUV 512
|
|
|
|
DLLEXPORT unsigned long DLLCALL TJBUFSIZE(int width, int height);
|
|
|
|
DLLEXPORT unsigned long DLLCALL TJBUFSIZEYUV(int width, int height,
|
|
int jpegSubsamp);
|
|
|
|
DLLEXPORT int DLLCALL tjCompress(tjhandle handle, unsigned char *srcBuf,
|
|
int width, int pitch, int height, int pixelSize, unsigned char *dstBuf,
|
|
unsigned long *compressedSize, int jpegSubsamp, int jpegQual, int flags);
|
|
|
|
DLLEXPORT int DLLCALL tjEncodeYUV(tjhandle handle,
|
|
unsigned char *srcBuf, int width, int pitch, int height, int pixelSize,
|
|
unsigned char *dstBuf, int subsamp, int flags);
|
|
|
|
DLLEXPORT int DLLCALL tjDecompressHeader(tjhandle handle,
|
|
unsigned char *jpegBuf, unsigned long jpegSize, int *width, int *height);
|
|
|
|
DLLEXPORT int DLLCALL tjDecompress(tjhandle handle,
|
|
unsigned char *jpegBuf, unsigned long jpegSize, unsigned char *dstBuf,
|
|
int width, int pitch, int height, int pixelSize, int flags);
|
|
|
|
|
|
/**
|
|
* @}
|
|
*/
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif
|