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

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,

libavfilter/avfilter.h

@@ -25,7 +25,7 @@
 #include "libavutil/avutil.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  1
-#define LIBAVFILTER_VERSION_MINOR 25
+#define LIBAVFILTER_VERSION_MINOR 26
 #define LIBAVFILTER_VERSION_MICRO  1
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
@@ -68,7 +68,7 @@ typedef struct AVFilterBuffer
 {
     uint8_t *data[4];           ///< buffer data for each plane
     int linesize[4];            ///< number of bytes per line
-    enum PixelFormat format;    ///< colorspace
+    int format;                 ///< media format
 
     unsigned refcount;          ///< number of references to this buffer
 
@@ -190,7 +190,7 @@ typedef struct AVFilterFormats AVFilterFormats;
 struct AVFilterFormats
 {
     unsigned format_count;      ///< number of formats
-    enum PixelFormat *formats;  ///< list of pixel formats
+    int *formats;               ///< list of media formats
 
     unsigned refcount;          ///< number of references to this list
     AVFilterFormats ***refs;    ///< references to this list
@@ -199,25 +199,25 @@ struct AVFilterFormats
 /**
  * Create a list of supported formats. This is intended for use in
  * AVFilter->query_formats().
- * @param pix_fmts list of pixel formats, terminated by PIX_FMT_NONE
+ * @param fmts list of media formats, terminated by -1
  * @return the format list, with no existing references
  */
-AVFilterFormats *avfilter_make_format_list(const enum PixelFormat *pix_fmts);
+AVFilterFormats *avfilter_make_format_list(const int *fmts);
 
 /**
- * Add pix_fmt to the list of pixel formats contained in *avff.
+ * Add fmt to the list of media formats contained in *avff.
  * If *avff is NULL the function allocates the filter formats struct
  * and puts its pointer in *avff.
  *
  * @return a non negative value in case of success, or a negative
  * value corresponding to an AVERROR code in case of error
  */
-int avfilter_add_colorspace(AVFilterFormats **avff, enum PixelFormat pix_fmt);
+int avfilter_add_format(AVFilterFormats **avff, int fmt);
 
 /**
- * Return a list of all colorspaces supported by FFmpeg.
+ * Return a list of all formats supported by FFmpeg for the given media type.
  */
-AVFilterFormats *avfilter_all_colorspaces(void);
+AVFilterFormats *avfilter_all_formats(enum AVMediaType type);
 
 /**
  * Return a format list which contains the intersection of the formats of
@@ -507,9 +507,11 @@ struct AVFilterLink
         AVLINK_INIT             ///< complete
     } init_state;
 
+    enum AVMediaType type;      ///< filter media type
+
     int w;                      ///< agreed upon image width
     int h;                      ///< agreed upon image height
-    enum PixelFormat format;    ///< agreed upon image colorspace
+    int format;                 ///< agreed upon media format
 
     /**
      * Lists of formats supported by the input and output filters respectively.
@@ -544,7 +546,7 @@ int avfilter_link(AVFilterContext *src, unsigned srcpad,
                   AVFilterContext *dst, unsigned dstpad);
 
 /**
- * Negotiate the colorspace, dimensions, etc of all inputs to a filter.
+ * Negotiate the media format, dimensions, etc of all inputs to a filter.
  * @param filter the filter to negotiate the properties for its inputs
  * @return       zero on successful negotiation
  */

libavfilter/avfiltergraph.c

@@ -111,7 +111,7 @@ static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
     int scaler_count = 0;
     char inst_name[30];
 
-    /* ask all the sub-filters for their supported colorspaces */
+    /* ask all the sub-filters for their supported media formats */
     for(i = 0; i < graph->filter_count; i ++) {
         if(graph->filters[i]->filter->query_formats)
             graph->filters[i]->filter->query_formats(graph->filters[i]);
@@ -197,7 +197,7 @@ int avfilter_graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
         return -1;
 
     /* Once everything is merged, it's possible that we'll still have
-     * multiple valid colorspace choices. We pick the first one. */
+     * multiple valid media format choices. We pick the first one. */
     pick_formats(graph);
 
     return 0;

libavfilter/defaults.c

@@ -160,7 +160,11 @@ void avfilter_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
 
 int avfilter_default_query_formats(AVFilterContext *ctx)
 {
-    avfilter_set_common_formats(ctx, avfilter_all_colorspaces());
+    enum AVMediaType type = ctx->inputs [0] ? ctx->inputs [0]->type :
+                            ctx->outputs[0] ? ctx->outputs[0]->type :
+                            AVMEDIA_TYPE_VIDEO;
+
+    avfilter_set_common_formats(ctx, avfilter_all_formats(type));
     return 0;
 }
 

libavfilter/formats.c

@@ -70,47 +70,49 @@ AVFilterFormats *avfilter_merge_formats(AVFilterFormats *a, AVFilterFormats *b)
     return ret;
 }
 
-AVFilterFormats *avfilter_make_format_list(const enum PixelFormat *pix_fmts)
+AVFilterFormats *avfilter_make_format_list(const int *fmts)
 {
     AVFilterFormats *formats;
     int count;
 
-    for (count = 0; pix_fmts[count] != PIX_FMT_NONE; count++)
+    for (count = 0; fmts[count] != -1; count++)
         ;
 
     formats               = av_mallocz(sizeof(AVFilterFormats));
     formats->formats      = av_malloc(sizeof(*formats->formats) * count);
     formats->format_count = count;
-    memcpy(formats->formats, pix_fmts, sizeof(*formats->formats) * count);
+    memcpy(formats->formats, fmts, sizeof(*formats->formats) * count);
 
     return formats;
 }
 
-int avfilter_add_colorspace(AVFilterFormats **avff, enum PixelFormat pix_fmt)
+int avfilter_add_format(AVFilterFormats **avff, int fmt)
 {
-    enum PixelFormat *pix_fmts;
+    int *fmts;
 
     if (!(*avff) && !(*avff = av_mallocz(sizeof(AVFilterFormats))))
         return AVERROR(ENOMEM);
 
-    pix_fmts = av_realloc((*avff)->formats,
-                          sizeof((*avff)->formats) * ((*avff)->format_count+1));
-    if (!pix_fmts)
+    fmts = av_realloc((*avff)->formats,
+                      sizeof((*avff)->formats) * ((*avff)->format_count+1));
+    if (!fmts)
         return AVERROR(ENOMEM);
 
-    (*avff)->formats = pix_fmts;
-    (*avff)->formats[(*avff)->format_count++] = pix_fmt;
+    (*avff)->formats = fmts;
+    (*avff)->formats[(*avff)->format_count++] = fmt;
     return 0;
 }
 
-AVFilterFormats *avfilter_all_colorspaces(void)
+AVFilterFormats *avfilter_all_formats(enum AVMediaType type)
 {
     AVFilterFormats *ret = NULL;
-    enum PixelFormat pix_fmt;
+    int fmt;
+    int num_formats = type == AVMEDIA_TYPE_VIDEO ? PIX_FMT_NB : 0;
 
-    for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
-        if (!(av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_HWACCEL))
-            avfilter_add_colorspace(&ret, pix_fmt);
+    for (fmt = 0; fmt < num_formats; fmt++)
+        if ((type != AVMEDIA_TYPE_VIDEO) ||
+            (type == AVMEDIA_TYPE_VIDEO && !(av_pix_fmt_descriptors[fmt].flags & PIX_FMT_HWACCEL)))
+            avfilter_add_format(&ret, fmt);
 
     return ret;
 }

libavfilter/vf_scale.c

@@ -83,7 +83,7 @@ static int query_formats(AVFilterContext *ctx)
         formats = NULL;
         for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
             if (   sws_isSupportedInput(pix_fmt)
-                && (ret = avfilter_add_colorspace(&formats, pix_fmt)) < 0) {
+                && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
                 avfilter_formats_unref(&formats);
                 return ret;
             }
@@ -93,7 +93,7 @@ static int query_formats(AVFilterContext *ctx)
         formats = NULL;
         for (pix_fmt = 0; pix_fmt < PIX_FMT_NB; pix_fmt++)
             if (    sws_isSupportedOutput(pix_fmt)
-                && (ret = avfilter_add_colorspace(&formats, pix_fmt)) < 0) {
+                && (ret = avfilter_add_format(&formats, pix_fmt)) < 0) {
                 avfilter_formats_unref(&formats);
                 return ret;
             }