AudioProperties: get bitRate from ffmpeg if available

Clement Champetier · valnoel · commit dde24dbd4cd4 · 2015-03-17T16:42:20.000+01:00
If not, compute bitRate like before.
diff --git a/src/AvTranscoder/mediaProperty/AudioProperties.cpp b/src/AvTranscoder/mediaProperty/AudioProperties.cpp
@@ -157,9 +157,14 @@ size_t AudioProperties::getBitRate() const
 {
 	if( ! _codecContext )
 		throw std::runtime_error( "unknown codec context" );
-	int bitsPerSample = av_get_bits_per_sample( _codecContext->codec_id );
-	size_t bitRate = bitsPerSample ? _codecContext->sample_rate * _codecContext->channels * bitsPerSample : _codecContext->bit_rate;
-	return bitRate;
+
+	// return bit rate of stream
+	if( _codecContext->bit_rate )
+		return _codecContext->bit_rate;
+
+	// else get computed bit rate from our computation (warning: way to compute bit rate of PCM audio data)
+	int bitsPerSample = av_get_bits_per_sample( _codecContext->codec_id ); // 0 if unknown for the given codec
+	return _codecContext->sample_rate * _codecContext->channels * bitsPerSample;
 }
 
 size_t AudioProperties::getNbSamples() const
diff --git a/src/AvTranscoder/mediaProperty/AudioProperties.hpp b/src/AvTranscoder/mediaProperty/AudioProperties.hpp
@@ -28,8 +28,8 @@ class AvExport AudioProperties
 	size_t getCodecId() const;
 	size_t getSampleRate() const;
 	size_t getChannels() const;
-	size_t getBitRate() const;
-	size_t getNbSamples() const;
+	size_t getBitRate() const;  ///< 0 if unknown
+	size_t getNbSamples() const;  ///< 0 if unknown
 
 	size_t getTicksPerFrame() const;
 	Rational getTimeBase() const;
