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-- Programmed by Jedidiah Barber
-- Released into the public domain
-- This program opens the file supplied as a command line argument, then reads
-- up to 5 frames from it in Short, Integer, Float, Double formats, seeking to
-- the file beginning between each read. The data is printed to stdout, then
-- the file is closed. No modifications are made.
with
Ada.Command_Line,
Ada.Directories,
Ada.Text_IO,
Interfaces,
Libsndfile;
procedure Read_Example is
package ACom renames Ada.Command_Line;
package ADir renames Ada.Directories;
package TIO renames Ada.Text_IO;
My_Info : Libsndfile.File_Info := Libsndfile.Blank_Info;
My_Sound_File : Libsndfile.Sound_File;
begin
if ACom.Argument_Count < 1 then
TIO.Put_Line ("No filename provided");
ACom.Set_Exit_Status (ACom.Failure);
return;
end if;
if not ADir.Exists (ACom.Argument (1)) then
TIO.Put_Line ("File does not exist");
ACom.Set_Exit_Status (ACom.Failure);
return;
end if;
TIO.Put_Line ("Load file " & ACom.Argument (1));
My_Sound_File.Open (ACom.Argument (1), Libsndfile.Read_Only, My_Info);
TIO.New_Line;
declare
Channel_Count : Natural := My_Info.Channels;
Test_Frames : Libsndfile.Count_Type := 5;
My_Shorts : Libsndfile.Short_Data (1 .. Natural (Test_Frames) * Channel_Count);
My_Integers : Libsndfile.Integer_Data (1 .. Natural (Test_Frames) * Channel_Count);
My_Floats : Libsndfile.Float_Data (1 .. Natural (Test_Frames) * Channel_Count);
My_Doubles : Libsndfile.Double_Data (1 .. Natural (Test_Frames) * Channel_Count);
Read_Count, Position : Libsndfile.Count_Type;
begin
TIO.Put_Line ("Reading" & Libsndfile.Count_Type'Image (Test_Frames) &
" frames of Short data");
Read_Count := My_Sound_File.Read_Short (My_Shorts, Test_Frames);
TIO.Put_Line ("Obtained" & Libsndfile.Count_Type'Image (Read_Count) & " frames");
for Index in Integer range 1 .. Natural (Read_Count) * Channel_Count loop
TIO.Put_Line (Interfaces.Integer_16'Image (My_Shorts (Index)));
end loop;
TIO.Put_Line ("Seeking to start again");
Position := My_Sound_File.Seek (0, Libsndfile.From_Start);
TIO.Put_Line ("Reached position" & Libsndfile.Count_Type'Image (Position));
TIO.New_Line;
TIO.Put_Line ("Reading" & Libsndfile.Count_Type'Image (Test_Frames) &
" frames of Integer data");
Read_Count := My_Sound_File.Read_Integer (My_Integers, Test_Frames);
TIO.Put_Line ("Obtained" & Libsndfile.Count_Type'Image (Read_Count) & " frames");
for Index in Integer range 1 .. Natural (Read_Count) * Channel_Count loop
TIO.Put_Line (Interfaces.Integer_32'Image (My_Integers (Index)));
end loop;
TIO.Put_Line ("Seeking to start again");
Position := My_Sound_File.Seek (0, Libsndfile.From_Start);
TIO.Put_Line ("Reached position" & Libsndfile.Count_Type'Image (Position));
TIO.New_Line;
TIO.Put_Line ("Reading" & Libsndfile.Count_Type'Image (Test_Frames) &
" frames of Float data");
Read_Count := My_Sound_File.Read_Float (My_Floats, Test_Frames);
TIO.Put_Line ("Obtained" & Libsndfile.Count_Type'Image (Read_Count) & " frames");
for Index in Integer range 1 .. Natural (Read_Count) * Channel_Count loop
TIO.Put_Line (Interfaces.IEEE_Float_32'Image (My_Floats (Index)));
end loop;
TIO.Put_Line ("Seeking to start again");
Position := My_Sound_File.Seek (0, Libsndfile.From_Start);
TIO.Put_Line ("Reached position" & Libsndfile.Count_Type'Image (Position));
TIO.New_Line;
TIO.Put_Line ("Reading" & Libsndfile.Count_Type'Image (Test_Frames) &
" frames of Double data");
Read_Count := My_Sound_File.Read_Double (My_Doubles, Test_Frames);
TIO.Put_Line ("Obtained" & Libsndfile.Count_Type'Image (Read_Count) & " frames");
for Index in Integer range 1 .. Natural (Read_Count) * Channel_Count loop
TIO.Put_Line (Interfaces.IEEE_Float_64'Image (My_Doubles (Index)));
end loop;
TIO.New_Line;
end;
My_Sound_File.Close;
TIO.Put_Line ("File closed");
end Read_Example;
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