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Implement automatic video scaling (if requested)

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Add a scaler interface (defaults to swscale), and if a separate output
wants to use a different scale or format than the default output format,
allow a scaler instance to be created automatically for that output,
which will then receive the new scaled output.
This commit is contained in:
jp9000
2014-02-18 13:37:56 -07:00
parent 1044fa0e86
commit f2d4de3c03
14 changed files with 552 additions and 130 deletions
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86
libobs/media-io/video-frame.c Normal file
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/******************************************************************************
Copyright (C) 2013 by Hugh Bailey <obs.jim@gmail.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
#include "video-frame.h"
#define ALIGN_SIZE(size, align) \
size = (((size)+(align-1)) & (~(align-1)))
/* messy code alarm */
void video_frame_init(struct video_frame *frame, enum video_format format,
uint32_t width, uint32_t height)
{
size_t size;
size_t offsets[MAX_AV_PLANES];
int alignment = base_get_alignment();
memset(frame, 0, sizeof(struct video_frame));
memset(offsets, 0, sizeof(offsets));
switch (format) {
case VIDEO_FORMAT_NONE:
return;
case VIDEO_FORMAT_I420:
size = width * height;
ALIGN_SIZE(size, alignment);
offsets[0] = size;
size += (width/2) * (height/2);
ALIGN_SIZE(size, alignment);
offsets[1] = size;
size += (width/2) * (height/2);
ALIGN_SIZE(size, alignment);
frame->data[0] = bmalloc(size);
frame->data[1] = (uint8_t*)frame->data[0] + offsets[0];
frame->data[2] = (uint8_t*)frame->data[0] + offsets[1];
frame->linesize[0] = width;
frame->linesize[1] = width/2;
frame->linesize[2] = width/2;
break;
case VIDEO_FORMAT_NV12:
size = width * height;
ALIGN_SIZE(size, alignment);
offsets[0] = size;
size += (width/2) * (height/2) * 2;
ALIGN_SIZE(size, alignment);
frame->data[0] = bmalloc(size);
frame->data[1] = (uint8_t*)frame->data[0] + offsets[0];
frame->linesize[0] = width;
frame->linesize[1] = width;
break;
case VIDEO_FORMAT_YVYU:
case VIDEO_FORMAT_YUY2:
case VIDEO_FORMAT_UYVY:
size = width * height * 2;
ALIGN_SIZE(size, alignment);
frame->data[0] = bmalloc(size);
frame->linesize[0] = width*2;
break;
case VIDEO_FORMAT_RGBA:
case VIDEO_FORMAT_BGRA:
case VIDEO_FORMAT_BGRX:
size = width * height * 4;
ALIGN_SIZE(size, alignment);
frame->data[0] = bmalloc(size);
frame->linesize[0] = width*4;
break;
}
}