CAudio_ID

AVITags DLL has CAudio_ID enumeration declared in IExtendedAVITags interface for access technical characteristics of audio streams (up to 3) in the information container. These constants are suited to be Info_ID parameter in GetInfo and SetInfo methods. Note, you must use IDI_Audio_Stream, IDI_Audio_Stream2 or IDI_Audio_Stream for Type_ID parameter to refer the information of each audio stream properly.

To determine if there exists particular audio stream in AVI file check IDA_Codec_TwoCC value of the corresponding stream:

   if GetInfo(aviinfo, IDI_Audio_Stream, IDA_Codec_TwoCC) <> '' then begin // The audio stream #1 exists

All the constants in the enumeration lie in the range [0 .. IDA_max], so if you want to count all the IDA_... values, use following construction:

   for cur_ida := 0 to IDA_max do begin
      ... cur_ida ...
   end;

Constant	Unit	Example	Description
IDA_Codec_TwoCC	---	8132	decimal representation of two character code of the audio codec used, for example: 85 - MPEG 1 Layer 3   8132 - NCT Soft ALF2CD ACM
IDA_Data_Rate	bits per second	255984	characterize bandwidth: average amount of information per second used when audio being decompressed
IDA_Sampling_Rate	Hz	44100	characterize maximum audio frequency: number of samples per second
IDA_Bit_Depth	bits per sample	0	informative for PCM and similar audio formats: a number of bits in one audio sample (usually 8, 16 or 24 bits)
IDA_Channels	---	2	a number of audio channels encoded in the audio stream, for example: 1 - mono   2 - stereo   5 - surround sound and so on
IDA_Duration	millisecondes	9567	duration of the audio stream
IDA_Language	---	0	language of the audio stream in terms of locale code, for example: 1049 - Russian
IDA_Rate	samples per scale unit	31998	characterize audio playback speed: rate value (sps = rate / scale)
IDA_Scale	scale units per second	2972	characterize audio playback speed: scale value (sps = rate / scale)
IDA_Length	samples	103	total number of audio samples in the audio stream
IDA_Size	bytes	306125	total size of the audio data (without corresponding headers and indexes)
IDA_Sample_Size	bytes	2972	the size of audio sample