Getting the length of a Wav/Ogg in seconds

Overview

Author: philk
Date Submitted: 2004-06-24 06:57:44

Source Code

/*
==========================
s_GetWaveLength

Returns the length of the sound in milliseconds
==========================
*/
int snd_GetLength(const tchar_t* filename)
{
	int		size;
	char	sSampleBuffer[16*1024];
	int		pcmlength = 0;
	int		bits, channels, freq;
	int		handle;
		
	handle = s_OpenWave(filename);
	if (0 == handle)
	{
		return 0;
	}
	
	do
	{
		size = s_ReadWave(handle, sSampleBuffer, sizeof(sSampleBuffer), &bits, &channels, &freq);
		pcmlength += size;
	}while (size);

	// close the file again
	s_CloseWave(handle);

	return pcmlength / (bits / 8) / channels / freq;
}

Description

I just thought I might share some small piece of code I recently added to the sound.c file. It calculates the duration of any sound in seconds.

This is not optimized though, since it was mainly written for calculating the length of Ogg musics. And due to the nature of the Ogg/Vorbis file format one cannot just read the length of the uncompressed pcm data from the header. So one optimization would be for WAVE files to just read the RIFF header and do some small calcs for the ADPCM files. A good place would be sound.c and the function

int s_UncompressedSampleSize(streamingwave_t* wavedata)

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