summaryrefslogtreecommitdiffstatshomepage
path: root/3rdparty/bgfx/examples/common/aviwriter.h
blob: 554e7166e244a04db6f7ffff89165a82a09c6b05 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
/*
 * Copyright 2011-2018 Branimir Karadzic. All rights reserved.
 * License: https://github.com/bkaradzic/bgfx#license-bsd-2-clause
 */

#ifndef AVIWRITER_H_HEADER_GUARD
#define AVIWRITER_H_HEADER_GUARD

#include <bx/readerwriter.h>

// Simple AVI writer. VideoLAN and VirtualDub can decode it.
// Needs some bits to get jiggled to work with other players. But it's good
// enough for an example.
struct AviWriter
{
	AviWriter(bx::FileWriterI* _writer)
		: m_writer(_writer)
		, m_frame(NULL)
		, m_frameSize(0)
		, m_numFrames(0)
		, m_width(0)
		, m_height(0)
		, m_yflip(false)
	{
	}

	bool open(const char* _filePath, uint32_t _width, uint32_t _height, uint32_t _fps, bool _yflip)
	{
		if (!bx::open(m_writer, _filePath) )
		{
			return false;
		}

		m_frameSize = _width * _height * 3;
		m_frame = new uint8_t[m_frameSize + 8];
		m_numFrames = 0;
		m_width = _width;
		m_height = _height;

		// Bgfx returns _yflip true for OpenGL since bottom left corner is 0, 0. In D3D top left corner
		// is 0, 0. DIB expect OpenGL style coordinates, so this is inverted logic for AVI writer.
		m_yflip = !_yflip;

		bx::StaticMemoryBlockWriter mem(m_frame, 8);
		// Stream Data (LIST 'movi' Chunk) http://msdn.microsoft.com/en-us/library/ms899496.aspx
		bx::write(&mem, BX_MAKEFOURCC('0', '0', 'd', 'b') );
		bx::write(&mem, m_frameSize);

		bx::write(m_writer, BX_MAKEFOURCC('R', 'I', 'F', 'F') );
		m_riffSizeOffset = m_writer->seek();
		bx::write(m_writer, UINT32_C(0) );

		bx::write(m_writer, BX_MAKEFOURCC('A', 'V', 'I', ' ') );

		// AVI RIFF Form http://msdn.microsoft.com/en-us/library/ms899422.aspx
		bx::write(m_writer, BX_MAKEFOURCC('L', 'I', 'S', 'T') );
		bx::write(m_writer, UINT32_C(192) );
		bx::write(m_writer, BX_MAKEFOURCC('h', 'd', 'r', 'l') );

		// AVI Main Header http://msdn.microsoft.com/en-us/library/ms779632.aspx
		bx::write(m_writer, BX_MAKEFOURCC('a', 'v', 'i', 'h') );
		bx::write(m_writer, UINT32_C(56) );
		bx::write(m_writer, UINT32_C(0) );      // dwMicroSecPerFrame
		bx::write(m_writer, UINT32_C(0) );      // dwMaxBytesPerSec
		bx::write(m_writer, UINT32_C(0) );      // dwPaddingGranularity
		bx::write(m_writer, UINT32_C(0x110) );  // dwFlags

		m_totalFramesOffset = m_writer->seek();
		bx::write(m_writer, UINT32_C(0) );      // dwTotalFrames

		bx::write(m_writer, UINT32_C(0) );      // dwInitialFrames
		bx::write(m_writer, UINT32_C(1) );      // dwStreams
		bx::write(m_writer, UINT32_C(0) );      // dwSuggestedBufferSize
		bx::write(m_writer, _width);            // dwWidth
		bx::write(m_writer, _height);           // dwHeight
		bx::write(m_writer, UINT32_C(0) );      // dwReserved0
		bx::write(m_writer, UINT32_C(0) );      // dwReserved1
		bx::write(m_writer, UINT32_C(0) );      // dwReserved2
		bx::write(m_writer, UINT32_C(0) );      // dwReserved3

		bx::write(m_writer, BX_MAKEFOURCC('L', 'I', 'S', 'T') );
		bx::write(m_writer, UINT32_C(116) );
		bx::write(m_writer, BX_MAKEFOURCC('s', 't', 'r', 'l') );

		// AVISTREAMHEADER Structure http://msdn.microsoft.com/en-us/library/ms779638.aspx
		bx::write(m_writer, BX_MAKEFOURCC('s', 't', 'r', 'h') );
		bx::write(m_writer, UINT32_C(56) );
		// AVI Stream Headers http://msdn.microsoft.com/en-us/library/ms899423.aspx
		bx::write(m_writer, BX_MAKEFOURCC('v', 'i', 'd', 's') ); // fccType
		bx::write(m_writer, BX_MAKEFOURCC('D', 'I', 'B', ' ') ); // fccHandler
		bx::write(m_writer, UINT32_C(0) );      // dwFlags
		bx::write(m_writer, uint16_t(0) );      // wPriority
		bx::write(m_writer, uint16_t(0) );      // wLanguage
		bx::write(m_writer, UINT32_C(0) );      // dwInitialFrames
		bx::write(m_writer, UINT32_C(1) );      // dwScale
		bx::write(m_writer, _fps);              // dwRate
		bx::write(m_writer, UINT32_C(0) );      // dwStart

		m_lengthOffset = m_writer->seek();
		bx::write(m_writer, UINT32_C(0) );      // dwLength

		bx::write(m_writer, m_frameSize);       // dwSuggestedBufferSize
		bx::write(m_writer, UINT32_MAX);        // dwQuality
		bx::write(m_writer, UINT32_C(0) );      // dwSampleSize
		bx::write(m_writer, int16_t(0) );       // rcFrame.left
		bx::write(m_writer, int16_t(0) );       // rcFrame.top
		bx::write(m_writer, uint16_t(_width) ); // rcFrame.right
		bx::write(m_writer, uint16_t(_height) );// rcFrame.bottom

		bx::write(m_writer, BX_MAKEFOURCC('s', 't', 'r', 'f') );
		bx::write(m_writer, UINT32_C(40) );

		// BITMAPINFOHEADER structure http://msdn.microsoft.com/en-us/library/windows/desktop/dd318229%28v=vs.85%29.aspx
		bx::write(m_writer, UINT32_C(40) );     // biSize
		bx::write(m_writer, _width);            // biWidth
		bx::write(m_writer, _height);           // biHeight
		bx::write(m_writer, uint16_t(1) );      // biPlanes
		bx::write(m_writer, uint16_t(24) );     // biBitCount
		bx::write(m_writer, UINT32_C(0) );      // biCompression
		bx::write(m_writer, m_frameSize);       // biSizeImage
		bx::write(m_writer, UINT32_C(0) );      // biXPelsPerMeter
		bx::write(m_writer, UINT32_C(0) );      // biYPelsPerMeter
		bx::write(m_writer, UINT32_C(0) );      // biClrUsed
		bx::write(m_writer, UINT32_C(0) );      // biClrImportant

		bx::write(m_writer, BX_MAKEFOURCC('L', 'I', 'S', 'T') );

		m_moviListOffset = m_writer->seek();
		bx::write(m_writer, UINT32_C(0) );
		bx::write(m_writer, BX_MAKEFOURCC('m', 'o', 'v', 'i') );

		return true;
	}

	void close()
	{
		if (NULL != m_frame)
		{
			int64_t pos = m_writer->seek();
			m_writer->seek(m_moviListOffset, bx::Whence::Begin);
			bx::write(m_writer, uint32_t(pos-m_moviListOffset-4) );
			m_writer->seek(pos, bx::Whence::Begin);

			bx::write(m_writer, BX_MAKEFOURCC('i', 'd', 'x', '1') );
			bx::write(m_writer, m_numFrames*16);

			for (uint32_t ii = 0, offset = 4; ii < m_numFrames; ++ii)
			{
				bx::write(m_writer, BX_MAKEFOURCC('0', '0', 'd', 'b') );
				bx::write(m_writer, UINT32_C(16) );
				bx::write(m_writer, offset);
				bx::write(m_writer, m_frameSize);
				offset += m_frameSize + 8;
			}

			pos = m_writer->seek();
			m_writer->seek(m_riffSizeOffset, bx::Whence::Begin);
			bx::write(m_writer, uint32_t(pos-m_riffSizeOffset-4) );

			m_writer->seek(m_totalFramesOffset, bx::Whence::Begin);
			bx::write(m_writer, m_numFrames);

			m_writer->seek(m_lengthOffset, bx::Whence::Begin);
			bx::write(m_writer, m_numFrames);

			bx::close(m_writer);

			delete [] m_frame;
			m_frame = NULL;
			m_frameSize = 0;
		}
	}

	void frame(const void* _data)
	{
		if (NULL != m_frame)
		{
			++m_numFrames;
			uint32_t width = m_width;
			uint32_t height = m_height;

			uint8_t* bgr = &m_frame[8];

			if (m_yflip)
			{
				for (uint32_t yy = 0; yy < height; ++yy)
				{
					const uint8_t* bgra = (const uint8_t*)_data + (height-1-yy)*width*4;

					for (uint32_t ii = 0; ii < width; ++ii)
					{
						bgr[0] = bgra[0];
						bgr[1] = bgra[1];
						bgr[2] = bgra[2];
						bgr += 3;
						bgra += 4;
					}
				}
			}
			else
			{
				const uint8_t* bgra = (const uint8_t*)_data;
				for (uint32_t ii = 0, num = m_frameSize/3; ii < num; ++ii)
				{
					bgr[0] = bgra[0];
					bgr[1] = bgra[1];
					bgr[2] = bgra[2];
					bgr += 3;
					bgra += 4;
				}
			}

			bx::write(m_writer, m_frame, m_frameSize+8);
		}
	}

	bx::FileWriterI* m_writer;
	int64_t m_riffSizeOffset;
	int64_t m_totalFramesOffset;
	int64_t m_lengthOffset;
	int64_t m_moviListOffset;
	uint8_t* m_frame;
	uint32_t m_frameSize;
	uint32_t m_numFrames;
	uint32_t m_width;
	uint32_t m_height;
	bool m_yflip;
};

#endif // AVIWRITER_H_HEADER_GUARD