mirror of
https://github.com/hrydgard/ppsspp.git
synced 2026-11-02 04:21:41 +01:00
Henrik RydgårdandClaude Opus 5.5
d0e3141f43
The ffmpeg submodule held prebuilt libraries for every platform next to the sources (about 1.5 GB checked out), and nothing uses those any more. Only the needed sources are copied in, from the submodule's commit, along with every header and template they include. The path is new, so checking out commits on either side of this works. It's also cut down to what PPSSPP uses: the H.264, AAC, MP3, ATRAC3 and ATRAC3+ decoders, the H.264 parser, the demuxers as before, and the FFV1 encoder, AVI muxer and file protocol for AVI dumping. config.h takes its CONFIG_ values from FFmpeg 3.0.2's own configure run with just those enabled. The raw H.264 demuxer stays even though nothing opens raw H.264: probing PSMF data uses it to identify the video stream's codec, which otherwise comes out as none. On top of that: - The files nothing links (configure would build them, but they're never pulled out of the static library, going by the GCC link map) are left out: mostly libavutil's crypto and hashing and the alternative DCT/IDCT/FFT versions. - libswresample isn't built, now that nothing uses it. - The H.264 decoder only does 8-bit video, which is all the PSP has. The SPS parser rejects any other bit depth, and the DSP files no longer build their 9- to 16-bit variants, which the linker kept because the init functions pick one by bit depth at run time. That's 160 files to compile instead of 277, and 391 of FFmpeg's vendored, about 5.8 MB. The README in ext/ffmpeg has what was done, the PPSSPP patches in the copy, how to add a component, and the tradeoffs. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
87 lines
3.1 KiB
C
87 lines
3.1 KiB
C
/*
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* Copyright (c) 2014 Vittorio Giovara <vittorio.giovara@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_DISPLAY_H
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#define AVUTIL_DISPLAY_H
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#include <stdint.h>
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/**
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* The display transformation matrix specifies an affine transformation that
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* should be applied to video frames for correct presentation. It is compatible
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* with the matrices stored in the ISO/IEC 14496-12 container format.
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*
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* The data is a 3x3 matrix represented as a 9-element array:
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*
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* | a b u |
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* (a, b, u, c, d, v, x, y, w) -> | c d v |
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* | x y w |
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*
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* All numbers are stored in native endianness, as 16.16 fixed-point values,
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* except for u, v and w, which are stored as 2.30 fixed-point values.
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*
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* The transformation maps a point (p, q) in the source (pre-transformation)
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* frame to the point (p', q') in the destination (post-transformation) frame as
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* follows:
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* | a b u |
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* (p, q, 1) . | c d v | = z * (p', q', 1)
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* | x y w |
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*
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* The transformation can also be more explicitly written in components as
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* follows:
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* p' = (a * p + c * q + x) / z;
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* q' = (b * p + d * q + y) / z;
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* z = u * p + v * q + w
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*/
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/**
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* Extract the rotation component of the transformation matrix.
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*
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* @param matrix the transformation matrix
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* @return the angle (in degrees) by which the transformation rotates the frame
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* counterclockwise. The angle will be in range [-180.0, 180.0],
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* or NaN if the matrix is singular.
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*
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* @note floating point numbers are inherently inexact, so callers are
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* recommended to round the return value to nearest integer before use.
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*/
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double av_display_rotation_get(const int32_t matrix[9]);
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/**
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* Initialize a transformation matrix describing a pure counterclockwise
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* rotation by the specified angle (in degrees).
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*
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* @param matrix an allocated transformation matrix (will be fully overwritten
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* by this function)
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* @param angle rotation angle in degrees.
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*/
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void av_display_rotation_set(int32_t matrix[9], double angle);
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/**
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* Flip the input matrix horizontally and/or vertically.
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*
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* @param matrix an allocated transformation matrix
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* @param hflip whether the matrix should be flipped horizontally
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* @param vflip whether the matrix should be flipped vertically
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*/
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void av_display_matrix_flip(int32_t matrix[9], int hflip, int vflip);
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#endif /* AVUTIL_DISPLAY_H */
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