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bgfx/examples/common/aviwriter.h
Branimir Karadžić ac925b00c8 Cleanup.
2014-05-03 15:18:28 -07:00

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/*
* Copyright 2011-2014 Branimir Karadzic. All rights reserved.
* License: http://www.opensource.org/licenses/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 (0 != m_writer->open(_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(0x101) ); // 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_C(0) ); // wPriority
bx::write(m_writer, UINT16_C(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_C(0) ); // rcFrame.left
bx::write(m_writer, INT16_C(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_C(1) ); // biPlanes
bx::write(m_writer, UINT16_C(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);
m_writer->close();
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
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