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Make avfilter_get_video_buffer() recursive.

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When called on a link with a filter whose destination pad has not a
get_video_buffer callback defined, it will call
avfilter_get_video_buffer() on the first output link of the
destination filer, rather than use avfilter_default_get_buffer(), so
the video buffer can be allocated forward in the filterchain.

Also add the w and h parameters to avfilter_get_video_buffer(), as the
minimum width and height requested by each filter in the filterchain
may change, this allows for example a memcpy-less pad filter.

This change breaks API / ABI backward compatibility.

See the thread:
"[PATCH] Implement recusive avfilter_get_video_buffer()".

Originally committed as revision 20272 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2009-10-18 08:16:18 +00:00
parent 1f09ab5e66
commit 0eb4ff9e37
3 changed files with 21 additions and 15 deletions
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13
libavfilter/avfilter.c
View File

@ -185,17 +185,20 @@ static void dprintf_link(void *ctx, AVFilterLink *link, int end)
#define DPRINTF_START(ctx, func) dprintf(NULL, "%-16s: ", #func)
AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms)
AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
AVFilterPicRef *ret = NULL;
DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d\n", perms);
DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
if(link_dpad(link).get_video_buffer)
ret = link_dpad(link).get_video_buffer(link, perms);
ret = link_dpad(link).get_video_buffer(link, perms, w, h);
if(!ret && link->dst->output_count)
ret = avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
if(!ret)
ret = avfilter_default_get_video_buffer(link, perms);
ret = avfilter_default_get_video_buffer(link, perms, w, h);
DPRINTF_START(NULL, get_video_buffer); dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); dprintf_picref(NULL, ret, 1);
@ -251,7 +254,7 @@ void avfilter_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
link_dpad(link).min_perms, link_dpad(link).rej_perms);
*/
link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms);
link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
link->srcpic = picref;
link->cur_pic->pts = link->srcpic->pts;
link->cur_pic->pixel_aspect = link->srcpic->pixel_aspect;

15
libavfilter/avfilter.h
View File

@ -22,9 +22,9 @@
#ifndef AVFILTER_AVFILTER_H
#define AVFILTER_AVFILTER_H
#define LIBAVFILTER_VERSION_MAJOR 0
#define LIBAVFILTER_VERSION_MINOR 5
#define LIBAVFILTER_VERSION_MICRO 1
#define LIBAVFILTER_VERSION_MAJOR 1
#define LIBAVFILTER_VERSION_MINOR 0
#define LIBAVFILTER_VERSION_MICRO 0
#define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
LIBAVFILTER_VERSION_MINOR, \
@ -293,7 +293,7 @@ struct AVFilterPad
*
* Input video pads only.
*/
AVFilterPicRef *(*get_video_buffer)(AVFilterLink *link, int perms);
AVFilterPicRef *(*get_video_buffer)(AVFilterLink *link, int perms, int w, int h);
/**
* Callback called after the slices of a frame are completely sent. If
@ -361,7 +361,7 @@ int avfilter_default_config_output_link(AVFilterLink *link);
int avfilter_default_config_input_link (AVFilterLink *link);
/** default handler for get_video_buffer() for video inputs */
AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link,
int perms);
int perms, int w, int h);
/**
* A helper for query_formats() which sets all links to the same list of
* formats. If there are no links hooked to this filter, the list of formats is
@ -499,10 +499,13 @@ int avfilter_config_links(AVFilterContext *filter);
* @param link the output link to the filter from which the picture will
* be requested
* @param perms the required access permissions
* @param w the minimum width of the buffer to allocate
* @param h the minimum height of the buffer to allocate
* @return A reference to the picture. This must be unreferenced with
* avfilter_unref_pic when you are finished with it.
*/
AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms);
AVFilterPicRef *avfilter_get_video_buffer(AVFilterLink *link, int perms,
int w, int h);
/**
* Requests an input frame from the filter at the other end of the link.

8
libavfilter/defaults.c
View File

@ -32,7 +32,7 @@ void avfilter_default_free_video_buffer(AVFilterPic *pic)
/* TODO: set the buffer's priv member to a context structure for the whole
* filter chain. This will allow for a buffer pool instead of the constant
* alloc & free cycle currently implemented. */
AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
{
AVFilterPic *pic = av_mallocz(sizeof(AVFilterPic));
AVFilterPicRef *ref = av_mallocz(sizeof(AVFilterPicRef));
@ -40,8 +40,8 @@ AVFilterPicRef *avfilter_default_get_video_buffer(AVFilterLink *link, int perms)
char *buf;
ref->pic = pic;
ref->w = pic->w = link->w;
ref->h = pic->h = link->h;
ref->w = pic->w = w;
ref->h = pic->h = h;
/* make sure the buffer gets read permission or it's useless for output */
ref->perms = perms | AV_PERM_READ;
@ -72,7 +72,7 @@ void avfilter_default_start_frame(AVFilterLink *link, AVFilterPicRef *picref)
out = link->dst->outputs[0];
if(out) {
out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE);
out->outpic = avfilter_get_video_buffer(out, AV_PERM_WRITE, link->w, link->h);
out->outpic->pts = picref->pts;
avfilter_start_frame(out, avfilter_ref_pic(out->outpic, ~0));
}