@@ -581,3 +581,16 @@ const AVPixFmtDescriptor av_pix_fmt_descriptors[PIX_FMT_NB] = {

         .flags = PIX_FMT_BE,

     },

 };

+

+int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)

+{

+    int c, bits = 0;

+    int log2_pixels = pixdesc->log2_chroma_w + pixdesc->log2_chroma_h;

+

+    for (c = 0; c < pixdesc->nb_channels; c++) {

+        int s = c==1 || c==2 ? 0 : log2_pixels;

+        bits += (pixdesc->comp[c].depth_minus1+1) << s;

+    }

+

+    return bits >> log2_pixels;

+}

@@ -193,4 +193,14 @@ static inline void write_line(const uint16_t *src, uint8_t *data[4], const int l

     }

 }

+/**

+ * Returns the number of bits per pixel used by the pixel format

+ * described by pixdesc.

+ *

+ * The returned number of bits refers to the number of bits actually

+ * used for storing the pixel information, that is padding bits are

+ * not counted.

+ */

+int av_get_bits_per_pixel(const AVPixFmtDescriptor *pixdesc);

+

 #endif /* AVCODEC_PIXDESC_H */