summaryrefslogtreecommitdiffstats
path: root/thirdparties/iphone/include/libyuv/libyuv/mjpeg_decoder.h
diff options
context:
space:
mode:
Diffstat (limited to 'thirdparties/iphone/include/libyuv/libyuv/mjpeg_decoder.h')
-rwxr-xr-xthirdparties/iphone/include/libyuv/libyuv/mjpeg_decoder.h256
1 files changed, 129 insertions, 127 deletions
diff --git a/thirdparties/iphone/include/libyuv/libyuv/mjpeg_decoder.h b/thirdparties/iphone/include/libyuv/libyuv/mjpeg_decoder.h
index 8423121..bb51204 100755
--- a/thirdparties/iphone/include/libyuv/libyuv/mjpeg_decoder.h
+++ b/thirdparties/iphone/include/libyuv/libyuv/mjpeg_decoder.h
@@ -20,7 +20,8 @@ struct jpeg_common_struct;
struct jpeg_decompress_struct;
struct jpeg_source_mgr;
-namespace libyuv {
+namespace libyuv
+{
#ifdef __cplusplus
extern "C" {
@@ -35,23 +36,23 @@ LIBYUV_BOOL ValidateJpeg(const uint8* sample, size_t sample_size);
static const uint32 kUnknownDataSize = 0xFFFFFFFF;
enum JpegSubsamplingType {
- kJpegYuv420,
- kJpegYuv422,
- kJpegYuv411,
- kJpegYuv444,
- kJpegYuv400,
- kJpegUnknown
+ kJpegYuv420,
+ kJpegYuv422,
+ kJpegYuv411,
+ kJpegYuv444,
+ kJpegYuv400,
+ kJpegUnknown
};
struct Buffer {
- const uint8* data;
- int len;
+ const uint8* data;
+ int len;
};
struct BufferVector {
- Buffer* buffers;
- int len;
- int pos;
+ Buffer* buffers;
+ int len;
+ int pos;
};
struct SetJmpErrorMgr;
@@ -63,127 +64,128 @@ struct SetJmpErrorMgr;
// MJPEG frames.
//
// See http://tools.ietf.org/html/rfc2435
-class LIBYUV_API MJpegDecoder {
- public:
- typedef void (*CallbackFunction)(void* opaque,
- const uint8* const* data,
- const int* strides,
- int rows);
+class LIBYUV_API MJpegDecoder
+{
+public:
+ typedef void (*CallbackFunction)(void* opaque,
+ const uint8* const* data,
+ const int* strides,
+ int rows);
- static const int kColorSpaceUnknown;
- static const int kColorSpaceGrayscale;
- static const int kColorSpaceRgb;
- static const int kColorSpaceYCbCr;
- static const int kColorSpaceCMYK;
- static const int kColorSpaceYCCK;
+ static const int kColorSpaceUnknown;
+ static const int kColorSpaceGrayscale;
+ static const int kColorSpaceRgb;
+ static const int kColorSpaceYCbCr;
+ static const int kColorSpaceCMYK;
+ static const int kColorSpaceYCCK;
- MJpegDecoder();
- ~MJpegDecoder();
+ MJpegDecoder();
+ ~MJpegDecoder();
- // Loads a new frame, reads its headers, and determines the uncompressed
- // image format.
- // Returns LIBYUV_TRUE if image looks valid and format is supported.
- // If return value is LIBYUV_TRUE, then the values for all the following
- // getters are populated.
- // src_len is the size of the compressed mjpeg frame in bytes.
- LIBYUV_BOOL LoadFrame(const uint8* src, size_t src_len);
-
- // Returns width of the last loaded frame in pixels.
- int GetWidth();
-
- // Returns height of the last loaded frame in pixels.
- int GetHeight();
-
- // Returns format of the last loaded frame. The return value is one of the
- // kColorSpace* constants.
- int GetColorSpace();
-
- // Number of color components in the color space.
- int GetNumComponents();
-
- // Sample factors of the n-th component.
- int GetHorizSampFactor(int component);
-
- int GetVertSampFactor(int component);
-
- int GetHorizSubSampFactor(int component);
-
- int GetVertSubSampFactor(int component);
-
- // Public for testability.
- int GetImageScanlinesPerImcuRow();
-
- // Public for testability.
- int GetComponentScanlinesPerImcuRow(int component);
-
- // Width of a component in bytes.
- int GetComponentWidth(int component);
-
- // Height of a component.
- int GetComponentHeight(int component);
-
- // Width of a component in bytes with padding for DCTSIZE. Public for testing.
- int GetComponentStride(int component);
-
- // Size of a component in bytes.
- int GetComponentSize(int component);
-
- // Call this after LoadFrame() if you decide you don't want to decode it
- // after all.
- LIBYUV_BOOL UnloadFrame();
-
- // Decodes the entire image into a one-buffer-per-color-component format.
- // dst_width must match exactly. dst_height must be <= to image height; if
- // less, the image is cropped. "planes" must have size equal to at least
- // GetNumComponents() and they must point to non-overlapping buffers of size
- // at least GetComponentSize(i). The pointers in planes are incremented
- // to point to after the end of the written data.
- // TODO(fbarchard): Add dst_x, dst_y to allow specific rect to be decoded.
- LIBYUV_BOOL DecodeToBuffers(uint8** planes, int dst_width, int dst_height);
-
- // Decodes the entire image and passes the data via repeated calls to a
- // callback function. Each call will get the data for a whole number of
- // image scanlines.
- // TODO(fbarchard): Add dst_x, dst_y to allow specific rect to be decoded.
- LIBYUV_BOOL DecodeToCallback(CallbackFunction fn, void* opaque,
- int dst_width, int dst_height);
-
- // The helper function which recognizes the jpeg sub-sampling type.
- static JpegSubsamplingType JpegSubsamplingTypeHelper(
- int* subsample_x, int* subsample_y, int number_of_components);
-
- private:
- void AllocOutputBuffers(int num_outbufs);
- void DestroyOutputBuffers();
-
- LIBYUV_BOOL StartDecode();
- LIBYUV_BOOL FinishDecode();
-
- void SetScanlinePointers(uint8** data);
- LIBYUV_BOOL DecodeImcuRow();
-
- int GetComponentScanlinePadding(int component);
-
- // A buffer holding the input data for a frame.
- Buffer buf_;
- BufferVector buf_vec_;
+ // Loads a new frame, reads its headers, and determines the uncompressed
+ // image format.
+ // Returns LIBYUV_TRUE if image looks valid and format is supported.
+ // If return value is LIBYUV_TRUE, then the values for all the following
+ // getters are populated.
+ // src_len is the size of the compressed mjpeg frame in bytes.
+ LIBYUV_BOOL LoadFrame(const uint8* src, size_t src_len);
+
+ // Returns width of the last loaded frame in pixels.
+ int GetWidth();
+
+ // Returns height of the last loaded frame in pixels.
+ int GetHeight();
+
+ // Returns format of the last loaded frame. The return value is one of the
+ // kColorSpace* constants.
+ int GetColorSpace();
+
+ // Number of color components in the color space.
+ int GetNumComponents();
+
+ // Sample factors of the n-th component.
+ int GetHorizSampFactor(int component);
+
+ int GetVertSampFactor(int component);
+
+ int GetHorizSubSampFactor(int component);
+
+ int GetVertSubSampFactor(int component);
+
+ // Public for testability.
+ int GetImageScanlinesPerImcuRow();
+
+ // Public for testability.
+ int GetComponentScanlinesPerImcuRow(int component);
+
+ // Width of a component in bytes.
+ int GetComponentWidth(int component);
+
+ // Height of a component.
+ int GetComponentHeight(int component);
+
+ // Width of a component in bytes with padding for DCTSIZE. Public for testing.
+ int GetComponentStride(int component);
+
+ // Size of a component in bytes.
+ int GetComponentSize(int component);
+
+ // Call this after LoadFrame() if you decide you don't want to decode it
+ // after all.
+ LIBYUV_BOOL UnloadFrame();
+
+ // Decodes the entire image into a one-buffer-per-color-component format.
+ // dst_width must match exactly. dst_height must be <= to image height; if
+ // less, the image is cropped. "planes" must have size equal to at least
+ // GetNumComponents() and they must point to non-overlapping buffers of size
+ // at least GetComponentSize(i). The pointers in planes are incremented
+ // to point to after the end of the written data.
+ // TODO(fbarchard): Add dst_x, dst_y to allow specific rect to be decoded.
+ LIBYUV_BOOL DecodeToBuffers(uint8** planes, int dst_width, int dst_height);
+
+ // Decodes the entire image and passes the data via repeated calls to a
+ // callback function. Each call will get the data for a whole number of
+ // image scanlines.
+ // TODO(fbarchard): Add dst_x, dst_y to allow specific rect to be decoded.
+ LIBYUV_BOOL DecodeToCallback(CallbackFunction fn, void* opaque,
+ int dst_width, int dst_height);
+
+ // The helper function which recognizes the jpeg sub-sampling type.
+ static JpegSubsamplingType JpegSubsamplingTypeHelper(
+ int* subsample_x, int* subsample_y, int number_of_components);
+
+private:
+ void AllocOutputBuffers(int num_outbufs);
+ void DestroyOutputBuffers();
+
+ LIBYUV_BOOL StartDecode();
+ LIBYUV_BOOL FinishDecode();
+
+ void SetScanlinePointers(uint8** data);
+ LIBYUV_BOOL DecodeImcuRow();
+
+ int GetComponentScanlinePadding(int component);
+
+ // A buffer holding the input data for a frame.
+ Buffer buf_;
+ BufferVector buf_vec_;
- jpeg_decompress_struct* decompress_struct_;
- jpeg_source_mgr* source_mgr_;
- SetJmpErrorMgr* error_mgr_;
+ jpeg_decompress_struct* decompress_struct_;
+ jpeg_source_mgr* source_mgr_;
+ SetJmpErrorMgr* error_mgr_;
- // LIBYUV_TRUE iff at least one component has scanline padding. (i.e.,
- // GetComponentScanlinePadding() != 0.)
- LIBYUV_BOOL has_scanline_padding_;
+ // LIBYUV_TRUE iff at least one component has scanline padding. (i.e.,
+ // GetComponentScanlinePadding() != 0.)
+ LIBYUV_BOOL has_scanline_padding_;
- // Temporaries used to point to scanline outputs.
- int num_outbufs_; // Outermost size of all arrays below.
- uint8*** scanlines_;
- int* scanlines_sizes_;
- // Temporary buffer used for decoding when we can't decode directly to the
- // output buffers. Large enough for just one iMCU row.
- uint8** databuf_;
- int* databuf_strides_;
+ // Temporaries used to point to scanline outputs.
+ int num_outbufs_; // Outermost size of all arrays below.
+ uint8*** scanlines_;
+ int* scanlines_sizes_;
+ // Temporary buffer used for decoding when we can't decode directly to the
+ // output buffers. Large enough for just one iMCU row.
+ uint8** databuf_;
+ int* databuf_strides_;
};
} // namespace libyuv
OpenPOWER on IntegriCloud