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/* $Id: render.c,v 1.17 2005/04/14 17:37:54 titer Exp $
This file is part of the HandBrake source code.
Homepage: <http://handbrake.m0k.org/>.
It may be used under the terms of the GNU General Public License. */
#include "hb.h"
#include "ffmpeg/avcodec.h"
#include "ffmpeg/swscale.h"
struct hb_work_private_s
{
hb_job_t * job;
struct SwsContext * context;
AVPicture pic_tmp_in;
AVPicture pic_tmp_crop;
AVPicture pic_tmp_out;
hb_buffer_t * buf_scale;
hb_fifo_t * subtitle_queue;
hb_fifo_t * delay_queue;
int frames_to_extend;
int dropped_frames;
int extended_frames;
uint64_t last_start[4];
uint64_t last_stop[4];
};
int renderInit( hb_work_object_t *, hb_job_t * );
int renderWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
void renderClose( hb_work_object_t * );
hb_work_object_t hb_render =
{
WORK_RENDER,
"Renderer",
renderInit,
renderWork,
renderClose
};
/*
* getU() & getV()
*
* Utility function that finds where the U is in the YUV sub-picture
*
* The Y data is at the top, followed by U and V, but the U and V
* are half the width of the Y, i.e. each chroma element covers 2x2
* of the Y's.
*/
static uint8_t *getU(uint8_t *data, int width, int height, int x, int y)
{
return(&data[(((y/2) * (width/2)) + (x/2)) + (width*height)]);
}
static uint8_t *getV(uint8_t *data, int width, int height, int x, int y)
{
return(&data[(((y/2) * (width/2)) + (x/2)) + (width*height) +
(width*height)/4]);
}
static void ApplySub( hb_job_t * job, hb_buffer_t * buf,
hb_buffer_t ** _sub )
{
hb_buffer_t * sub = *_sub;
hb_title_t * title = job->title;
int i, j, offset_top, offset_left;
uint8_t * lum, * alpha, * out, * sub_chromaU, * sub_chromaV;
if( !sub )
{
return;
}
/* If necessary, move the subtitle so it is not in a cropped zone.
When it won't fit, we center it so we loose as much on both ends.
Otherwise we try to leave a 20px margin around it. */
if( sub->height > title->height - job->crop[0] - job->crop[1] - 40 )
offset_top = job->crop[0] + ( title->height - job->crop[0] -
job->crop[1] - sub->height ) / 2;
else if( sub->y < job->crop[0] + 20 )
offset_top = job->crop[0] + 20;
else if( sub->y > title->height - job->crop[1] - 20 - sub->height )
offset_top = title->height - job->crop[1] - 20 - sub->height;
else
offset_top = sub->y;
if( sub->width > title->width - job->crop[2] - job->crop[3] - 40 )
offset_left = job->crop[2] + ( title->width - job->crop[2] -
job->crop[3] - sub->width ) / 2;
else if( sub->x < job->crop[2] + 20 )
offset_left = job->crop[2] + 20;
else if( sub->x > title->width - job->crop[3] - 20 - sub->width )
offset_left = title->width - job->crop[3] - 20 - sub->width;
else
offset_left = sub->x;
lum = sub->data;
alpha = lum + sub->width * sub->height;
sub_chromaU = alpha + sub->width * sub->height;
sub_chromaV = sub_chromaU + sub->width * sub->height;
out = buf->data + offset_top * title->width + offset_left;
for( i = 0; i < sub->height; i++ )
{
if( offset_top + i >= 0 && offset_top + i < title->height )
{
for( j = 0; j < sub->width; j++ )
{
if( offset_left + j >= 0 && offset_left + j < title->width )
{
uint8_t *chromaU, *chromaV;
/*
* Merge the luminance and alpha with the picture
*/
out[j] = ( (uint16_t) out[j] * ( 16 - (uint16_t) alpha[j] ) +
(uint16_t) lum[j] * (uint16_t) alpha[j] ) >> 4;
/*
* Set the chroma (colour) based on whether there is
* any alpha at all. Don't try to blend with the picture.
*/
chromaU = getU(buf->data, title->width, title->height,
offset_left+j, offset_top+i);
chromaV = getV(buf->data, title->width, title->height,
offset_left+j, offset_top+i);
if( alpha[j] > 0 )
{
/*
* Add the chroma from the sub-picture, as this is
* not a transparent element.
*/
*chromaU = sub_chromaU[j];
*chromaV = sub_chromaV[j];
}
}
}
}
lum += sub->width;
alpha += sub->width;
sub_chromaU += sub->width;
sub_chromaV += sub->width;
out += title->width;
}
hb_buffer_close( _sub );
}
int renderWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
hb_buffer_t ** buf_out )
{
hb_work_private_t * pv = w->private_data;
hb_job_t * job = pv->job;
hb_title_t * title = job->title;
hb_buffer_t * in = *buf_in, * buf_tmp_in = *buf_in;
hb_buffer_t * ivtc_buffer = NULL;
if(!in->data)
{
/* If the input buffer is end of stream, send out an empty one
* to the next stage as well. Note that this will result in us
* losing the current contents of the delay queue.
*/
*buf_out = hb_buffer_init(0);
return HB_WORK_OK;
}
/*
* During the indepth_scan ditch the buffers here before applying filters or attempting to
* use the subtitles.
*/
if( job->indepth_scan )
{
*buf_out = NULL;
return HB_WORK_OK;
}
/* Push subtitles onto queue just in case we need to delay a frame */
if( in->sub )
{
hb_fifo_push( pv->subtitle_queue, in->sub );
}
else
{
hb_fifo_push( pv->subtitle_queue, hb_buffer_init(0) );
}
/* Setup render buffer */
hb_buffer_t * buf_render = hb_buffer_init( 3 * job->width * job->height / 2 );
/* Cache frame start and stop times, so we can renumber
time stamps if dropping frames for VFR. */
int i;
for( i = 3; i >= 1; i-- )
{
pv->last_start[i] = pv->last_start[i-1];
pv->last_stop[i] = pv->last_stop[i-1];
}
pv->last_start[0] = in->start;
pv->last_stop[0] = in->stop;
/* Apply filters */
if( job->filters )
{
int filter_count = hb_list_count( job->filters );
int i;
for( i = 0; i < filter_count; i++ )
{
hb_filter_object_t * filter = hb_list_item( job->filters, i );
if( !filter )
{
continue;
}
hb_buffer_t * buf_tmp_out = NULL;
int result = filter->work( buf_tmp_in,
&buf_tmp_out,
PIX_FMT_YUV420P,
title->width,
title->height,
filter->private_data );
/*
* FILTER_OK: set temp buffer to filter buffer, continue
* FILTER_DELAY: set temp buffer to NULL, abort
* FILTER_DROP: set temp buffer to NULL, pop subtitle, abort
* FILTER_FAILED: leave temp buffer alone, continue
*/
if( result == FILTER_OK )
{
buf_tmp_in = buf_tmp_out;
}
else if( result == FILTER_DELAY )
{
buf_tmp_in = NULL;
break;
}
else if( result == FILTER_DROP )
{
hb_fifo_get( pv->subtitle_queue );
buf_tmp_in = NULL;
if( job->vfr )
{
pv->frames_to_extend += 4;
pv->dropped_frames++;
}
break;
}
}
}
/* Apply subtitles */
if( buf_tmp_in )
{
hb_buffer_t * subtitles = hb_fifo_get( pv->subtitle_queue );
if( subtitles )
{
ApplySub( job, buf_tmp_in, &subtitles );
}
}
/* Apply crop/scale if specified */
if( buf_tmp_in && pv->context )
{
avpicture_fill( &pv->pic_tmp_in, buf_tmp_in->data,
PIX_FMT_YUV420P,
title->width, title->height );
avpicture_fill( &pv->pic_tmp_out, buf_render->data,
PIX_FMT_YUV420P,
job->width, job->height );
// Crop; this alters the pointer to the data to point to the correct place for cropped frame
av_picture_crop( &pv->pic_tmp_crop, &pv->pic_tmp_in, PIX_FMT_YUV420P,
job->crop[0], job->crop[2] );
// Scale pic_crop into pic_render according to the context set up in renderInit
sws_scale(pv->context,
pv->pic_tmp_crop.data, pv->pic_tmp_crop.linesize,
0, title->height - (job->crop[0] + job->crop[1]),
pv->pic_tmp_out.data, pv->pic_tmp_out.linesize);
hb_buffer_copy_settings( buf_render, buf_tmp_in );
buf_tmp_in = buf_render;
}
/* Set output to render buffer */
(*buf_out) = buf_render;
if( buf_tmp_in == NULL )
{
/* Teardown and cleanup buffers if we are emitting NULL */
if( buf_in && *buf_in )
{
hb_buffer_close( buf_in );
*buf_in = NULL;
}
if( buf_out && *buf_out )
{
hb_buffer_close( buf_out );
*buf_out = NULL;
}
}
else if( buf_tmp_in != buf_render )
{
/* Copy temporary results and settings into render buffer */
memcpy( buf_render->data, buf_tmp_in->data, buf_render->size );
hb_buffer_copy_settings( buf_render, buf_tmp_in );
}
if (*buf_out)
{
hb_fifo_push( pv->delay_queue, *buf_out );
*buf_out = NULL;
}
/*
* Keep the last three frames in our queue, this ensures that we have the last
* two always in there should we need to rewrite the durations on them.
*/
if( hb_fifo_size( pv->delay_queue ) >= 3 )
{
*buf_out = hb_fifo_get( pv->delay_queue );
}
if( *buf_out )
{
if( pv->frames_to_extend )
{
/*
* A frame's been dropped by VFR detelecine.
* Gotta make up the lost time. This will also
* slow down the video to 23.976fps.
* The dropped frame ran for 3003 ticks, so
* divvy it up amongst the 4 frames left behind.
* This is what the delay_queue is for;
* telecined sequences start 2 frames before
* the dropped frame, so to slow down the right
* ones you need a 2 frame delay between
* reading input and writing output.
*/
ivtc_buffer = *buf_out;
/* The 4th cached frame will be the to use. */
ivtc_buffer->start = pv->last_start[3];
ivtc_buffer->stop = pv->last_stop[3];
if (pv->frames_to_extend % 4)
ivtc_buffer->stop += 751;
else
ivtc_buffer->stop += 750;
/* Set the 3rd cached frame to start when this one stops,
and to stop 3003 ticks later -- a normal 29.97fps
length frame. If it needs to be extended as well to
make up lost time, it'll be handled on the next
loop through the renderer. */
pv->last_start[2] = ivtc_buffer->stop;
pv->last_stop[2] = ivtc_buffer->stop + 3003;
pv->frames_to_extend--;
pv->extended_frames++;
}
}
return HB_WORK_OK;
}
void renderClose( hb_work_object_t * w )
{
hb_work_private_t * pv = w->private_data;
hb_log("render: dropped frames: %i (%i ticks)", pv->dropped_frames, (pv->dropped_frames * 3003) );
hb_log("render: extended frames: %i (%i ticks)", pv->extended_frames, ( ( pv->extended_frames / 4 ) * 3003 ) );
hb_log("render: Lost time: %i frames (%i ticks)", (pv->dropped_frames * 4) - (pv->extended_frames), (pv->dropped_frames * 3003) - ( ( pv->extended_frames / 4 ) * 3003 ) );
/* Cleanup subtitle queue */
if( pv->subtitle_queue )
{
hb_fifo_close( &pv->subtitle_queue );
}
if( pv->delay_queue )
{
hb_fifo_close( &pv->delay_queue );
}
/* Cleanup filters */
/* TODO: Move to work.c? */
if( pv->job->filters )
{
int filter_count = hb_list_count( pv->job->filters );
int i;
for( i = 0; i < filter_count; i++ )
{
hb_filter_object_t * filter = hb_list_item( pv->job->filters, i );
if( !filter ) continue;
filter->close( filter->private_data );
}
hb_list_close( &pv->job->filters );
}
/* Cleanup render work structure */
free( pv );
w->private_data = NULL;
}
int renderInit( hb_work_object_t * w, hb_job_t * job )
{
/* Allocate new private work object */
hb_work_private_t * pv = calloc( 1, sizeof( hb_work_private_t ) );
pv->job = job;
w->private_data = pv;
/* Get title and title size */
hb_title_t * title = job->title;
/* If crop or scale is specified, setup rescale context */
if( job->crop[0] || job->crop[1] || job->crop[2] || job->crop[3] ||
job->width != title->width || job->height != title->height )
{
pv->context = sws_getContext(title->width - (job->crop[2] + job->crop[3]),
title->height - (job->crop[0] + job->crop[1]),
PIX_FMT_YUV420P,
job->width, job->height, PIX_FMT_YUV420P,
(uint16_t)(SWS_LANCZOS|SWS_ACCURATE_RND), NULL, NULL, NULL);
}
/* Setup FIFO queue for subtitle cache */
pv->subtitle_queue = hb_fifo_init( 8 );
pv->delay_queue = hb_fifo_init( 8 );
pv->frames_to_extend = 0;
pv->dropped_frames = 0;
pv->extended_frames = 0;
pv->last_start[0] = 0;
pv->last_stop[0] = 0;
/* Setup filters */
/* TODO: Move to work.c? */
if( job->filters )
{
int filter_count = hb_list_count( job->filters );
int i;
for( i = 0; i < filter_count; i++ )
{
hb_filter_object_t * filter = hb_list_item( job->filters, i );
if( !filter ) continue;
filter->private_data = filter->init( PIX_FMT_YUV420P,
title->width,
title->height,
filter->settings );
}
}
return 0;
}
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