forked from mia/Aegisub
158 lines
5.7 KiB
C++
158 lines
5.7 KiB
C++
// Copyright (c) 2009, Karl Blomster
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of the Aegisub Group nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Aegisub Project http://www.aegisub.org/
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//
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// $Id$
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/// @file video_provider_yuv4mpeg.h
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/// @see video_provider_yuv4mpeg.cpp
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/// @ingroup video_input
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///
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#ifndef MAGI_PRE
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#include <stdio.h>
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#include <vector>
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#endif
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#include "libmedia/video.h"
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namespace media {
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/// the maximum allowed header length, in bytes
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#define YUV4MPEG_HEADER_MAXLEN 128
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/// @class YUV4MPEGVideoProvider
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/// @brief Implements reading of YUV4MPEG uncompressed video files
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class YUV4MPEGVideoProvider : public VideoProvider {
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/// Pixel formats
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enum Y4M_PixelFormat {
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Y4M_PIXFMT_NONE = -1, /// not set/unknown
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/// 4:2:0 sampling variants.
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/// afaict the only difference between these three
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/// is the chroma sample location, and nobody cares about that.
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Y4M_PIXFMT_420JPEG, /// 4:2:0, H/V centered, for JPEG/MPEG-1
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Y4M_PIXFMT_420MPEG2, /// 4:2:0, H cosited, for MPEG-2
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Y4M_PIXFMT_420PALDV, /// 4:2:0, alternating Cb/Cr, for PAL-DV
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Y4M_PIXFMT_411, /// 4:1:1, H cosited
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Y4M_PIXFMT_422, /// 4:2:2, H cosited
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Y4M_PIXFMT_444, /// 4:4:4, i.e. no chroma subsampling
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Y4M_PIXFMT_444ALPHA, /// 4:4:4 plus alpha channel
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Y4M_PIXFMT_MONO, /// luma only (grayscale)
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};
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/// Interlacing mode for an entire stream
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enum Y4M_InterlacingMode {
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Y4M_ILACE_NOTSET = -1, /// undefined
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Y4M_ILACE_PROGRESSIVE, /// progressive (no interlacing)
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Y4M_ILACE_TFF, /// interlaced, top field first
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Y4M_ILACE_BFF, /// interlaced, bottom field first
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Y4M_ILACE_MIXED, /// mixed interlaced/progressive, possibly with RFF flags
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Y4M_ILACE_UNKNOWN, /// unknown interlacing mode (not the same as undefined)
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};
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/// Frame information flags
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enum Y4M_FrameFlags {
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Y4M_FFLAG_NOTSET = -1, /// undefined
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Y4M_FFLAG_NONE = 0x0000, /// no flags set
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/// field order/repeat field flags
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Y4M_FFLAG_R_TFF = 0x0001, /// top field first
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Y4M_FFLAG_R_TFF_R = 0x0002, /// top field first, and repeat that field
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Y4M_FFLAG_R_BFF = 0x0004, /// bottom field first
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Y4M_FFLAG_R_BFF_R = 0x0008, /// bottom field first, and repeat that field
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Y4M_FFLAG_R_P = 0x0010, /// progressive
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Y4M_FFLAG_R_P_R = 0x0020, /// progressive, and repeat frame once
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Y4M_FFLAG_R_P_RR = 0x0040, /// progressive, and repeat frame twice
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/// temporal sampling flags
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Y4M_FFLAG_T_P = 0x0080, /// progressive (fields sampled at the same time)
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Y4M_FFLAG_T_I = 0x0100, /// interlaced (fields sampled at different times)
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/// chroma subsampling flags
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Y4M_FFLAG_C_P = 0x0200, /// progressive (whole frame subsampled)
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Y4M_FFLAG_C_I = 0x0400, /// interlaced (fields subsampled independently)
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Y4M_FFLAG_C_UNKNOWN = 0x0800, /// unknown (only allowed for non-4:2:0 sampling)
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};
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FILE *sf; /// source file
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bool inited; /// initialization state
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int w, h; /// frame width/height
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int num_frames; /// length of file in frames
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int frame_sz; /// size of each frame in bytes
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int luma_sz; /// size of the luma plane of each frame, in bytes
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int chroma_sz; /// size of one of the two chroma planes of each frame, in bytes
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int cur_fn; /// current frame number
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Y4M_PixelFormat pixfmt; /// colorspace/pixel format
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Y4M_InterlacingMode imode; /// interlacing mode (for the entire stream)
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struct {
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int num; /// numerator
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int den; /// denominator
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} fps_rat; /// framerate
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agi::vfr::Framerate fps;
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/// a list of byte positions detailing where in the file
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/// each frame header can be found
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std::vector<int64_t> seek_table;
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void CheckFileFormat();
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void ParseFileHeader(const std::vector<std::string>& tags);
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Y4M_FrameFlags ParseFrameHeader(const std::vector<std::string>& tags);
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std::vector<std::string> ReadHeader(int64_t startpos, bool reset_pos=false);
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int IndexFile();
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public:
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YUV4MPEGVideoProvider(std::string filename);
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~YUV4MPEGVideoProvider();
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const AegiVideoFrame GetFrame(int n);
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int GetPosition() const { return cur_fn; }
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int GetFrameCount() const { return num_frames; }
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int GetWidth() const { return w; }
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int GetHeight() const { return h; }
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agi::vfr::Framerate GetFPS() const { return fps; }
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std::vector<int> GetKeyFrames() const { return std::vector<int>(); };
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std::string GetDecoderName() const { return "YU4MPEG"; };
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bool WantsCaching() const { return true; };
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};
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} // namespace media
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