Implemented bitrate reporting for vgmstream

Frameworks/vgmstream/vgmstream/src/vgmstream.c

@@ -3307,3 +3307,39 @@ void try_dual_file_stereo(VGMSTREAM * opened_stream, STREAMFILE *streamFile) {
 fail:
     return;
 }
+
+static int get_vgmstream_channel_average_bitrate(VGMSTREAMCHANNEL * channel, int sample_rate, int length_samples)
+{
+    return (int)((int64_t)get_streamfile_size(channel->streamfile) * 8 * sample_rate / length_samples);
+}
+
+int get_vgmstream_average_bitrate(VGMSTREAM * vgmstream)
+{
+    char path_current[PATH_LIMIT];
+    char path_compare[PATH_LIMIT];
+    
+    unsigned int i, j;
+    int bitrate = 0;
+    int sample_rate = vgmstream->sample_rate;
+    int length_samples = vgmstream->num_samples;
+    
+    if (vgmstream->channels >= 1)
+        bitrate += get_vgmstream_channel_average_bitrate(&vgmstream->ch[0], sample_rate, length_samples);
+
+    for (i = 1; i < vgmstream->channels; ++i)
+    {
+        VGMSTREAMCHANNEL * ch = &vgmstream->ch[i];
+        ch->streamfile->get_name(ch->streamfile, path_current, sizeof(path_current));
+        for (j = 0; j < i; ++j)
+        {
+            VGMSTREAMCHANNEL * chc = &vgmstream->ch[j];
+            chc->streamfile->get_name(chc->streamfile, path_compare, sizeof(path_compare));
+            if (!strcmp(path_current, path_compare))
+                break;
+        }
+        if (j == i)
+            bitrate += get_vgmstream_channel_average_bitrate(ch, sample_rate, length_samples);
+    }
+    
+    return bitrate;
+}

Frameworks/vgmstream/vgmstream/src/vgmstream.h

@@ -901,4 +901,8 @@ void describe_vgmstream(VGMSTREAM * vgmstream, char * desc, int length);
  * stereo stream. */
 void try_dual_file_stereo(VGMSTREAM * opened_stream, STREAMFILE *streamFile);
 
+/* Return the average bitrate in bps of all unique files contained within this
+ * stream. Compares files by absolute paths. */
+int get_vgmstream_average_bitrate(VGMSTREAM * vgmstream);
+
 #endif

Plugins/vgmstream/vgmstream/VGMDecoder.h

@@ -18,6 +18,7 @@
 
     int sampleRate;
     int channels;
+    int bitrate;
 	long totalFrames;
     long framesLength;
     long framesFade;

Plugins/vgmstream/vgmstream/VGMDecoder.m

@@ -131,6 +131,8 @@ err1:
     
     framesRead = 0;
     
+    bitrate = get_vgmstream_average_bitrate(stream);
+    
     [self willChangeValueForKey:@"properties"];
 	[self didChangeValueForKey:@"properties"];
     
@@ -140,7 +142,7 @@ err1:
 - (NSDictionary *)properties
 {
 	return [NSDictionary dictionaryWithObjectsAndKeys:
-            [NSNumber numberWithInt:0], @"bitrate",
+            [NSNumber numberWithInt:bitrate / 1000], @"bitrate",
             [NSNumber numberWithInt:sampleRate], @"sampleRate",
             [NSNumber numberWithDouble:totalFrames], @"totalFrames",
             [NSNumber numberWithInt:16], @"bitsPerSample",