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源代码在线查看： output.c
/*!
************************************************************************
* \file output.c
*
* \brief
* Output an image and Trance support
*
* \author
* Main contributors (see contributors.h for copyright, address and affiliation details)
* - Karsten Suehring
************************************************************************
*/
#include "contributors.h"
#include
#include
#include
#include "global.h"
#include "mbuffer.h"
#include "image.h"
FrameStore* out_buffer;
/*!
************************************************************************
* \brief
* Writes out a storable picture
* \param p
* Picture to be written
* \param p_out
* Output file
************************************************************************
*/
void write_picture(StorablePicture *p, FILE *p_out)
{
int i,j;
for(i=0;isize_y;i++)
for(j=0;jsize_x;j++)
{
fputc(p->imgY[i][j],p_out);
}
for(i=0;isize_y_cr;i++)
for(j=0;jsize_x_cr;j++)
{
fputc(p->imgUV[0][i][j],p_out);
}
for(i=0;isize_y_cr;i++)
for(j=0;jsize_x_cr;j++)
{
fputc(p->imgUV[1][i][j],p_out);
}
fflush(p_out);
}
/*!
************************************************************************
* \brief
* Initialize output buffer for direct output
************************************************************************
*/
void init_out_buffer()
{
out_buffer = alloc_frame_store();
}
/*!
************************************************************************
* \brief
* Uninitialize output buffer for direct output
************************************************************************
*/
void uninit_out_buffer()
{
free_frame_store(out_buffer);
out_buffer=NULL;
}
/*!
************************************************************************
* \brief
* Initialize picture memory with (Y:0,U:128,V:128)
************************************************************************
*/
void clear_picture(StorablePicture *p)
{
int i;
for(i=0;isize_y;i++)
memset(p->imgY[i], 0 ,p->size_x);
for(i=0;isize_y_cr;i++)
memset(p->imgUV[0][i], 128 ,p->size_x_cr);
for(i=0;isize_y_cr;i++)
memset(p->imgUV[1][i], 128 ,p->size_x_cr);
fflush(p_out);
}
/*!
************************************************************************
* \brief
* Write out not paired direct output fields. A second empty field is generated
* and combined into the frame buffer.
* \param fs
* FrameStore that contains a single field
* \param p_out
* Output file
************************************************************************
*/
void write_unpaired_field(FrameStore* fs, FILE *p_out)
{
StorablePicture *p;
assert (fs->is_used if(fs->is_used &1)
{
// we have a top field
// construct an empty bottom field
p = fs->top_field;
fs->bottom_field = alloc_storable_picture(BOTTOM_FIELD, p->size_x, p->size_y, p->size_x_cr, p->size_y_cr);
clear_picture(fs->bottom_field);
dpb_combine_field(fs);
write_picture (fs->frame, p_out);
fs->is_used=3;
}
if(fs->is_used &2)
{
// we have a bottom field
// construct an empty top field
p = fs->bottom_field;
fs->top_field = alloc_storable_picture(TOP_FIELD, p->size_x, p->size_y, p->size_x_cr, p->size_y_cr);
clear_picture(fs->bottom_field);
dpb_combine_field(fs);
write_picture (fs->frame, p_out);
fs->is_used=3;
}
}
/*!
************************************************************************
* \brief
* Write out unpaired fields from output buffer.
* \param p_out
* Output file
************************************************************************
*/
void flush_direct_output(FILE *p_out)
{
write_unpaired_field(out_buffer, p_out);
free_storable_picture(out_buffer->frame);
out_buffer->frame = NULL;
free_storable_picture(out_buffer->top_field);
out_buffer->top_field = NULL;
free_storable_picture(out_buffer->bottom_field);
out_buffer->bottom_field = NULL;
out_buffer->is_used = 0;
}
/*!
************************************************************************
* \brief
* Write a frame (from FrameStore)
* \param fs
* FrameStore containing the frame
* \param p_out
* Output file
************************************************************************
*/
void write_stored_frame( FrameStore *fs,FILE *p_out)
{
// make sure no direct output field is pending
flush_direct_output(p_out);
if (fs->is_used {
write_unpaired_field(fs, p_out);
}
else
{
write_picture(fs->frame, p_out);
}
fs->is_output = 1;
}
/*!
************************************************************************
* \brief
* Directly output a picture without storing it in the DPB. Fields
* are buffered before they are written to the file.
* \param p
* Picture for output
* \param p_out
* Output file
************************************************************************
*/
void direct_output(StorablePicture *p, FILE *p_out)
{
if (p->structure==FRAME)
{
// we have a frame (or complementary field pair)
// so output it directly
flush_direct_output(p_out);
write_picture (p, p_out);
if (p_ref)
find_snr(snr, p, p_ref);
free_storable_picture(p);
return;
}
if (p->structure == TOP_FIELD)
{
if (out_buffer->is_used &1)
flush_direct_output(p_out);
out_buffer->top_field = p;
out_buffer->is_used |= 1;
}
if (p->structure == BOTTOM_FIELD)
{
if (out_buffer->is_used &2)
flush_direct_output(p_out);
out_buffer->bottom_field = p;
out_buffer->is_used |= 2;
}
if (out_buffer->is_used == 3)
{
// we have both fields, so output them
dpb_combine_field(out_buffer);
write_picture (out_buffer->frame, p_out);
if (p_ref)
find_snr(snr, out_buffer->frame, p_ref);
free_storable_picture(out_buffer->frame);
out_buffer->frame = NULL;
free_storable_picture(out_buffer->top_field);
out_buffer->top_field = NULL;
free_storable_picture(out_buffer->bottom_field);
out_buffer->bottom_field = NULL;
out_buffer->is_used = 0;
}
}
