AviExporter::AviExporter(const String& fileName, Vec2i size, int fps)
: m_file (fileName, File::Create),
m_size (size),
m_frame (size, ImageFormat::R8_G8_B8),
m_fps (fps)
{
FW_ASSERT(size.min() > 0 && fps > 0);
m_lineBytes = (m_size.x * 3 + 3) & -4;
m_frameBytes = m_lineBytes * m_size.y;
m_numFrames = 0;
writeHeader();
}
void FW::exportTiffImage(OutputStream& stream, const Image* image)
{
// Select format and convert.
// - RGBA and floats are not well-supported.
// - PackBits compression does not make sense for RGB data.
FW_ASSERT(image);
Vec2i size = image->getSize();
bool empty = (size.min() <= 0);
const Image* source = image;
Image* converted = NULL;
if (empty ||
image->getFormat().getID() != ImageFormat::R8_G8_B8 ||
(int)image->getStride() != size.x * 4)
{
size = Vec2i(max(size.x, 1), max(size.y, 1));
converted = new Image(size, ImageFormat::R8_G8_B8);
if (empty)
converted->clear();
else
*converted = *image;
source = converted;
}
int numBytes = (int)source->getStride() * size.y;
// Write.
stream.writeU8('I'); // 0x00: endianess tag
stream.writeU8('I'); // 0x01: (little-endian)
stream.writeU16LE(42); // 0x02: format identifier
stream.writeU32LE(0x08); // 0x04: IFD offset
stream.writeU16LE(12); // 0x08: number of IFD entries
stream.writeU16LE(256); // 0x0A: Tag = ImageWidth
stream.writeU16LE(4); // 0x0C: Type = LONG
stream.writeU32LE(1); // 0x0E: Count
stream.writeU32LE(size.x); // 0x12: Value
stream.writeU16LE(257); // 0x16: Tag = ImageLength
stream.writeU16LE(4); // 0x18: Type = LONG
stream.writeU32LE(1); // 0x1A: Count
stream.writeU32LE(size.y); // 0x1E: Value
stream.writeU16LE(258); // 0x22: Tag = BitsPerSample
stream.writeU16LE(3); // 0x24: Type = SHORT
stream.writeU32LE(3); // 0x26: Count
stream.writeU32LE(0x9E); // 0x2A: Value offset
stream.writeU16LE(259); // 0x2E: Tag = Compression
stream.writeU16LE(3); // 0x30: Type = SHORT
stream.writeU32LE(1); // 0x32: Count
stream.writeU32LE(1); // 0x36: Value = No compression
stream.writeU16LE(262); // 0x3A: Tag = PhotometricInterpretation
stream.writeU16LE(3); // 0x3C: Type = SHORT
stream.writeU32LE(1); // 0x3E: Count
stream.writeU32LE(2); // 0x42: Value = RGB
stream.writeU16LE(273); // 0x46: Tag = StripOffsets
stream.writeU16LE(4); // 0x48: Type = LONG
stream.writeU32LE(1); // 0x4A: Count
stream.writeU32LE(0xAC); // 0x4E: Value
stream.writeU16LE(277); // 0x52: Tag = SamplesPerPixel
stream.writeU16LE(3); // 0x54: Type = SHORT
stream.writeU32LE(1); // 0x56: Count
stream.writeU32LE(3); // 0x5A: Value
stream.writeU16LE(278); // 0x5E: Tag = RowsPerStrip
stream.writeU16LE(4); // 0x60: Type = LONG
stream.writeU32LE(1); // 0x62: Count
stream.writeU32LE(size.y); // 0x66: Value
stream.writeU16LE(279); // 0x6A: Tag = StripByteCounts
stream.writeU16LE(4); // 0x6C: Type = LONG
stream.writeU32LE(1); // 0x6E: Count
stream.writeU32LE(numBytes); // 0x72: Value
stream.writeU16LE(282); // 0x76: Tag = XResolution
stream.writeU16LE(5); // 0x78: Type = RATIONAL
stream.writeU32LE(1); // 0x7A: Count
stream.writeU32LE(0xA4); // 0x7E: Value offset
stream.writeU16LE(283); // 0x82: Tag = YResolution
stream.writeU16LE(5); // 0x84: Type = RATIONAL
stream.writeU32LE(1); // 0x86: Count
stream.writeU32LE(0xA4); // 0x8A: Value offset
stream.writeU16LE(296); // 0x8E: Tag = ResolutionUnit
stream.writeU16LE(3); // 0x90: Type = SHORT
stream.writeU32LE(1); // 0x92: Count
stream.writeU32LE(2); // 0x96: Value = Inch
stream.writeU32LE(0); // 0x9A: next IFD offset
stream.writeU16LE(8); // 0x9E: BitsPerSample[0]
stream.writeU16LE(8); // 0xA0: BitsPerSample[1]
stream.writeU16LE(8); // 0xA2: BitsPerSample[2]
stream.writeU32LE(72); // 0xA4: Resolution numerator
stream.writeU32LE(1); // 0xA8: Resolution denominator
stream.write(source->getPtr(), numBytes); // 0xAC: image data
// Clean up.
delete converted;
}
