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lavfi: use a new field for automatic buffer copy.

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The code currently use cur_buf as the target of the copy,
but cur_buf can be cleared by the filter if it has given
the reference away or stored it elsewhere as soon as start_frame.

The code still relies on the fact that the reference is not
destroyed until end_frame. All filters currently follow that condition.
An av_assert1() is added to check it; it should at least cause
very visible errors in valgrind.
This commit is contained in:
Nicolas George 2012-07-29 18:43:45 +02:00
parent f85746509c
commit 8ef740ce01
2 changed files with 25 additions and 4 deletions
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9
libavfilter/avfilter.h
View File

@ -669,6 +669,15 @@ struct AVFilterLink {
* called with more samples, it will split them.
*/
int max_samples;
/**
* The buffer reference currently being received across the link by the
* destination filter. This is used internally by the filter system to
* allow automatic copying of buffers which do not have sufficient
* permissions for the destination. This should not be accessed directly
* by the filters.
*/
AVFilterBufferRef *cur_buf_copy;
};
/**

20
libavfilter/video.c
View File

@ -20,6 +20,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/imgutils.h"
#include "avfilter.h"
@ -223,6 +224,7 @@ static void clear_link(AVFilterLink *link)
avfilter_unref_bufferp(&link->cur_buf);
avfilter_unref_bufferp(&link->src_buf);
avfilter_unref_bufferp(&link->out_buf);
link->cur_buf_copy = NULL; /* we do not own the reference */
}
/* XXX: should we do the duplicating of the picture ref here, instead of
@ -265,6 +267,8 @@ int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
else
link->cur_buf = picref;
link->cur_buf_copy = link->cur_buf;
while(cmd && cmd->time <= picref->pts * av_q2d(link->time_base)){
av_log(link->dst, AV_LOG_DEBUG,
"Processing command time:%f command:%s arg:%s\n",
@ -278,6 +282,10 @@ int ff_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
ff_update_link_current_pts(link, pts);
if (ret < 0)
clear_link(link);
else
/* incoming buffers must not be freed in start frame,
because they can still be in use by the automatic copy mechanism */
av_assert1(link->cur_buf_copy->buf->refcount > 0);
return ret;
}
@ -348,22 +356,22 @@ int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
if (link->src_buf->data[i]) {
src[i] = link->src_buf-> data[i] +
(y >> (i==1 || i==2 ? vsub : 0)) * link->src_buf-> linesize[i];
dst[i] = link->cur_buf->data[i] +
(y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf->linesize[i];
dst[i] = link->cur_buf_copy->data[i] +
(y >> (i==1 || i==2 ? vsub : 0)) * link->cur_buf_copy->linesize[i];
} else
src[i] = dst[i] = NULL;
}
for (i = 0; i < 4; i++) {
int planew =
av_image_get_linesize(link->format, link->cur_buf->video->w, i);
av_image_get_linesize(link->format, link->cur_buf_copy->video->w, i);
if (!src[i]) continue;
for (j = 0; j < h >> (i==1 || i==2 ? vsub : 0); j++) {
memcpy(dst[i], src[i], planew);
src[i] += link->src_buf->linesize[i];
dst[i] += link->cur_buf->linesize[i];
dst[i] += link->cur_buf_copy->linesize[i];
}
}
}
@ -373,6 +381,10 @@ int ff_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
ret = draw_slice(link, y, h, slice_dir);
if (ret < 0)
clear_link(link);
else
/* incoming buffers must not be freed in start frame,
because they can still be in use by the automatic copy mechanism */
av_assert1(link->cur_buf_copy->buf->refcount > 0);
return ret;
}