Update libyuv to r397
Change-Id: I70f5a527de52ae8ae80b189873c9a094035dfa2c
Signed-off-by: Hendrik Dahlkamp <hendrik@google.com>
diff --git a/files/include/libyuv/mjpeg_decoder.h b/files/include/libyuv/mjpeg_decoder.h
new file mode 100644
index 0000000..67090cf
--- /dev/null
+++ b/files/include/libyuv/mjpeg_decoder.h
@@ -0,0 +1,188 @@
+/*
+ * Copyright 2012 The LibYuv Project Authors. All rights reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef INCLUDE_LIBYUV_MJPEG_DECODER_H_ // NOLINT
+#define INCLUDE_LIBYUV_MJPEG_DECODER_H_
+
+#include "libyuv/basic_types.h"
+
+// NOTE: For a simplified public API use convert.h MJPGToI420().
+
+struct jpeg_common_struct;
+struct jpeg_decompress_struct;
+struct jpeg_source_mgr;
+
+namespace libyuv {
+
+static const uint32 kUnknownDataSize = 0xFFFFFFFF;
+
+enum JpegSubsamplingType {
+ kJpegYuv420,
+ kJpegYuv422,
+ kJpegYuv411,
+ kJpegYuv444,
+ kJpegYuv400,
+ kJpegUnknown
+};
+
+struct SetJmpErrorMgr;
+
+// MJPEG ("Motion JPEG") is a pseudo-standard video codec where the frames are
+// simply independent JPEG images with a fixed huffman table (which is omitted).
+// It is rarely used in video transmission, but is common as a camera capture
+// format, especially in Logitech devices. This class implements a decoder for
+// MJPEG frames.
+//
+// See http://tools.ietf.org/html/rfc2435
+class 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;
+
+ MJpegDecoder();
+ ~MJpegDecoder();
+
+ // Loads a new frame, reads its headers, and determines the uncompressed
+ // image format. Returns true if image looks valid and format is supported.
+ // If return value is true, then the values for all the following getters
+ // are populated.
+ // src_len is the size of the compressed mjpeg frame in bytes.
+ 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.
+ 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.
+ 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.
+ 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:
+ struct Buffer {
+ const uint8* data;
+ int len;
+ };
+
+ struct BufferVector {
+ Buffer* buffers;
+ int len;
+ int pos;
+ };
+
+ // Methods that are passed to jpeglib.
+ static int fill_input_buffer(jpeg_decompress_struct* cinfo);
+ static void init_source(jpeg_decompress_struct* cinfo);
+ static void skip_input_data(jpeg_decompress_struct* cinfo,
+ long num_bytes); // NOLINT
+ static void term_source(jpeg_decompress_struct* cinfo);
+
+ static void ErrorHandler(jpeg_common_struct* cinfo);
+
+ void AllocOutputBuffers(int num_outbufs);
+ void DestroyOutputBuffers();
+
+ bool StartDecode();
+ bool FinishDecode();
+
+ void SetScanlinePointers(uint8** data);
+ 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_;
+
+ // true iff at least one component has scanline padding. (i.e.,
+ // GetComponentScanlinePadding() != 0.)
+ 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_;
+};
+
+} // namespace libyuv
+
+#endif // INCLUDE_LIBYUV_MJPEG_DECODER_H_ NOLINT