Add support for listing the supported pixel formats using the option

-pix_fmt list
patch by Stefano Sabatini stefano sabatini minus lala chez poste it
original thread: [FFmpeg-devel] [PATCH] List supported pixel formats
date: 05/25/2007 05:46 PM

Originally committed as revision 9162 to svn://svn.ffmpeg.org/ffmpeg/trunk

2 files changed, 34 insertions, 0 deletions

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index df926fcd64..8880c40600 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -2615,6 +2615,19 @@ int avcodec_get_pix_fmt_loss(int dst_pix_fmt, int src_pix_fmt,
 int avcodec_find_best_pix_fmt(int pix_fmt_mask, int src_pix_fmt,
                               int has_alpha, int *loss_ptr);
 
+
+/**
+ * Print in buf the string corresponding to the pixel format with
+ * number pix_fmt, or an header if pix_fmt is negative.
+ *
+ * @param buf[in] the buffer where to write the string
+ * @param buf_size[in] the size of buf
+ * @param pix_fmt[in] the number of the pixel format to print the corresponding info string, or
+ * a negative value to print the corresponding header.
+ * Meaningful values for obtaining a pixel format info vary from 0 to PIX_FMT_NB -1.
+ */
+void avcodec_pix_fmt_string (char *buf, int buf_size, int pix_fmt);
+
 #define FF_ALPHA_TRANSP       0x0001 /* image has some totally transparent pixels */
 #define FF_ALPHA_SEMI_TRANSP  0x0002 /* image has some transparent pixels */
 
diff --git a/libavcodec/imgconvert.c b/libavcodec/imgconvert.c
index b72d0ee8cf..7fe88c8344 100644
--- a/libavcodec/imgconvert.c
+++ b/libavcodec/imgconvert.c
@@ -378,6 +378,27 @@ enum PixelFormat avcodec_get_pix_fmt(const char* name)
     return i;
 }
 
+void avcodec_pix_fmt_string (char *buf, int buf_size, int pix_fmt)
+{
+    PixFmtInfo info= pix_fmt_info[pix_fmt];
+
+    char is_alpha_char= info.is_alpha ? 'y' : 'n';
+
+    /* print header */
+    if (pix_fmt < 0)
+        snprintf (buf, buf_size,
+                  "name      " " nb_channels" " depth" " is_alpha"
+            );
+    else
+        snprintf (buf, buf_size,
+                  "%-10s" "      %1d     " "   %2d " "     %c   ",
+                  info.name,
+                  info.nb_channels,
+                  info.depth,
+                  is_alpha_char
+            );
+}
+
 int avpicture_fill(AVPicture *picture, uint8_t *ptr,
                    int pix_fmt, int width, int height)
 {