public void write_file_header()
{
emit_marker(JPEG_MARKER.SOI); /* first the SOI */
/* SOI is defined to reset restart interval to 0 */
m_last_restart_interval = 0;
if (m_cinfo.m_write_JFIF_header) /* next an optional JFIF APP0 */
emit_jfif_app0();
if (m_cinfo.m_write_Adobe_marker) /* next an optional Adobe APP14 */
emit_adobe_app14();
}
/// <summary>
/// Master selection of compression modules for transcoding.
/// </summary>
private void transencode_master_selection(jvirt_array<JBLOCK>[] coef_arrays)
{
/* Although we don't actually use input_components for transcoding,
* jcmaster.c's initial_setup will complain if input_components is 0.
*/
m_input_components = 1;
/* Initialize master control (includes parameter checking/processing) */
jinit_c_master_control(true /* transcode only */);
/* Entropy encoding: only Huffman coding supported. */
if (m_progressive_mode)
m_entropy = new phuff_entropy_encoder(this);
else
m_entropy = new huff_entropy_encoder(this);
/* We need a special coefficient buffer controller. */
m_coef = new my_trans_c_coef_controller(this, coef_arrays);
m_marker = new jpeg_marker_writer(this);
/* Write the datastream header (SOI, JFIF) immediately.
* Frame and scan headers are postponed till later.
* This lets application insert special markers after the SOI.
*/
m_marker.write_file_header();
}
