Generalize pixel format enum fields to int formats.

This is needed to make the libavfilter framework work with audio
filters.

In particular add a type field to AVFilterLink, change the field types:
enum PixelFormat format   -> int format   in AVFilterBuffer
enum PixelFormat *formats -> int *formats in AVFilterFormats
enum PixelFormat *format  -> int format   in AVFilterLink

and change the function signatures:
AVFilterFormats *avfilter_make_format_list(const enum PixelFormat *pix_fmts); ->
AVFilterFormats *avfilter_make_format_list(const int *fmts);

int avfilter_add_colorspace(AVFilterFormats **avff, enum PixelFormat pix_fmt); ->
int avfilter_add_format(AVFilterFormats **avff, int fmt);

AVFilterFormats *avfilter_all_colorspaces(void); ->
AVFilterFormats *avfilter_all_formats(enum AVMediaType type);

This change breaks libavfilter API/ABI.

Patch by S.N. Hemanth Meenakshisundaram |smeenaks|ucsd|edu|.

Originally committed as revision 24424 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 4 insertions, 2 deletions

diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index dc8f90d322..c040a9cefa 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -98,7 +98,9 @@ int avfilter_link(AVFilterContext *src, unsigned srcpad,
     link->dst     = dst;
     link->srcpad  = srcpad;
     link->dstpad  = dstpad;
-    link->format  = PIX_FMT_NONE;
+    link->type    = src->output_pads[srcpad].type;
+    assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
+    link->format  = -1;
 
     return 0;
 }
@@ -122,7 +124,7 @@ int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
     link->dstpad = in;
     filt->inputs[in] = link;
 
-    /* if any information on supported colorspaces already exists on the
+    /* if any information on supported media formats already exists on the
      * link, we need to preserve that */
     if(link->out_formats)
         avfilter_formats_changeref(&link->out_formats,