Aegisub/aegisub/libmedia/video/yuv4mpeg.h
2011-02-10 01:33:14 +00:00

158 lines
5.7 KiB
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// Copyright (c) 2009, Karl Blomster
// 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 Aegisub Group 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 OWNER 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.
//
// Aegisub Project http://www.aegisub.org/
//
// $Id$
/// @file video_provider_yuv4mpeg.h
/// @see video_provider_yuv4mpeg.cpp
/// @ingroup video_input
///
#ifndef MAGI_PRE
#include <stdio.h>
#include <vector>
#endif
#include "libmedia/video.h"
namespace media {
/// the maximum allowed header length, in bytes
#define YUV4MPEG_HEADER_MAXLEN 128
/// @class YUV4MPEGVideoProvider
/// @brief Implements reading of YUV4MPEG uncompressed video files
class YUV4MPEGVideoProvider : public VideoProvider {
/// Pixel formats
enum Y4M_PixelFormat {
Y4M_PIXFMT_NONE = -1, /// not set/unknown
/// 4:2:0 sampling variants.
/// afaict the only difference between these three
/// is the chroma sample location, and nobody cares about that.
Y4M_PIXFMT_420JPEG, /// 4:2:0, H/V centered, for JPEG/MPEG-1
Y4M_PIXFMT_420MPEG2, /// 4:2:0, H cosited, for MPEG-2
Y4M_PIXFMT_420PALDV, /// 4:2:0, alternating Cb/Cr, for PAL-DV
Y4M_PIXFMT_411, /// 4:1:1, H cosited
Y4M_PIXFMT_422, /// 4:2:2, H cosited
Y4M_PIXFMT_444, /// 4:4:4, i.e. no chroma subsampling
Y4M_PIXFMT_444ALPHA, /// 4:4:4 plus alpha channel
Y4M_PIXFMT_MONO, /// luma only (grayscale)
};
/// Interlacing mode for an entire stream
enum Y4M_InterlacingMode {
Y4M_ILACE_NOTSET = -1, /// undefined
Y4M_ILACE_PROGRESSIVE, /// progressive (no interlacing)
Y4M_ILACE_TFF, /// interlaced, top field first
Y4M_ILACE_BFF, /// interlaced, bottom field first
Y4M_ILACE_MIXED, /// mixed interlaced/progressive, possibly with RFF flags
Y4M_ILACE_UNKNOWN, /// unknown interlacing mode (not the same as undefined)
};
/// Frame information flags
enum Y4M_FrameFlags {
Y4M_FFLAG_NOTSET = -1, /// undefined
Y4M_FFLAG_NONE = 0x0000, /// no flags set
/// field order/repeat field flags
Y4M_FFLAG_R_TFF = 0x0001, /// top field first
Y4M_FFLAG_R_TFF_R = 0x0002, /// top field first, and repeat that field
Y4M_FFLAG_R_BFF = 0x0004, /// bottom field first
Y4M_FFLAG_R_BFF_R = 0x0008, /// bottom field first, and repeat that field
Y4M_FFLAG_R_P = 0x0010, /// progressive
Y4M_FFLAG_R_P_R = 0x0020, /// progressive, and repeat frame once
Y4M_FFLAG_R_P_RR = 0x0040, /// progressive, and repeat frame twice
/// temporal sampling flags
Y4M_FFLAG_T_P = 0x0080, /// progressive (fields sampled at the same time)
Y4M_FFLAG_T_I = 0x0100, /// interlaced (fields sampled at different times)
/// chroma subsampling flags
Y4M_FFLAG_C_P = 0x0200, /// progressive (whole frame subsampled)
Y4M_FFLAG_C_I = 0x0400, /// interlaced (fields subsampled independently)
Y4M_FFLAG_C_UNKNOWN = 0x0800, /// unknown (only allowed for non-4:2:0 sampling)
};
FILE *sf; /// source file
bool inited; /// initialization state
int w, h; /// frame width/height
int num_frames; /// length of file in frames
int frame_sz; /// size of each frame in bytes
int luma_sz; /// size of the luma plane of each frame, in bytes
int chroma_sz; /// size of one of the two chroma planes of each frame, in bytes
int cur_fn; /// current frame number
Y4M_PixelFormat pixfmt; /// colorspace/pixel format
Y4M_InterlacingMode imode; /// interlacing mode (for the entire stream)
struct {
int num; /// numerator
int den; /// denominator
} fps_rat; /// framerate
agi::vfr::Framerate fps;
/// a list of byte positions detailing where in the file
/// each frame header can be found
std::vector<int64_t> seek_table;
void CheckFileFormat();
void ParseFileHeader(const std::vector<std::string>& tags);
Y4M_FrameFlags ParseFrameHeader(const std::vector<std::string>& tags);
std::vector<std::string> ReadHeader(int64_t startpos, bool reset_pos=false);
int IndexFile();
public:
YUV4MPEGVideoProvider(std::string filename);
~YUV4MPEGVideoProvider();
const AegiVideoFrame GetFrame(int n);
int GetPosition() const { return cur_fn; }
int GetFrameCount() const { return num_frames; }
int GetWidth() const { return w; }
int GetHeight() const { return h; }
agi::vfr::Framerate GetFPS() const { return fps; }
std::vector<int> GetKeyFrames() const { return std::vector<int>(); };
std::string GetDecoderName() const { return "YU4MPEG"; };
bool WantsCaching() const { return true; };
};
} // namespace media