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259 | ------------------------------------------------------------------------------
-- --
-- WAVEFILES --
-- --
-- Main package --
-- --
-- The MIT License (MIT) --
-- --
-- Copyright (c) 2015 -- 2021 Gustavo A. Hoffmann --
-- --
-- Permission is hereby granted, free of charge, to any person obtaining --
-- a copy of this software and associated documentation files (the --
-- "Software"), to deal in the Software without restriction, including --
-- without limitation the rights to use, copy, modify, merge, publish, --
-- distribute, sublicense, and / or sell copies of the Software, and to --
-- permit persons to whom the Software is furnished to do so, subject to --
-- the following conditions: --
-- --
-- The above copyright notice and this permission notice shall be --
-- included in all copies or substantial portions of the Software. --
-- --
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, --
-- EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF --
-- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. --
-- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY --
-- CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, --
-- TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE --
-- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. --
------------------------------------------------------------------------------
with Ada.Streams.Stream_IO;
with Ada.Containers.Vectors;
with Interfaces;
with Audio.RIFF;
with Audio.RIFF.Wav.Formats; use Audio.RIFF.Wav.Formats;
package Audio.Wavefiles is
type Wavefile is tagged limited private;
type File_Mode is new Ada.Streams.Stream_IO.File_Mode;
type Wavefile_Error_Code is
(Wavefile_Error_File_Not_Open,
Wavefile_Error_File_Already_Open,
Wavefile_Error_File_Too_Short,
Wavefile_Error_Format_Chuck_Not_Found,
Wavefile_Error_Data_Chuck_Not_Found,
Wavefile_Error_Unsupported_Wavefile_Format,
Wavefile_Error_Unsupported_Bit_Depth,
Wavefile_Error_Unsupported_Format_Size);
type Wavefile_Errors is array (Wavefile_Error_Code) of Boolean
with Pack;
No_Wavefile_Errors : constant Wavefile_Errors := (others => False);
type Wavefile_Warning_Code is
(Wavefile_Warning_Inconsistent_Channel_Mask);
type Wavefile_Warnings is array (Wavefile_Warning_Code) of Boolean
with Pack;
No_Wavefile_Warnings : constant Wavefile_Warnings := (others => False);
subtype Byte is Interfaces.Unsigned_8;
type Byte_Array is array (Long_Integer range <>) of Byte;
type Wav_Chunk_Element is
record
Chunk_Tag : Wav_Chunk_Tag;
ID : Audio.RIFF.FOURCC_String;
Size : Long_Integer;
Start_Index : Ada.Streams.Stream_IO.Positive_Count;
Consolidated : Boolean;
end record;
function Chunk_Element_Data
(WF : Wavefile;
Chunk_Element : Wav_Chunk_Element) return Byte_Array;
package Wav_Chunk_Element_Vectors is new Ada.Containers.Vectors
(Index_Type => Positive,
Element_Type => Wav_Chunk_Element);
use Wav_Chunk_Element_Vectors;
subtype Wav_Chunk_Elements is Wav_Chunk_Element_Vectors.Vector;
type Wav_Chunk_Element_Found (Success : Boolean := False) is
record
case Success is
when False =>
null;
when True =>
Chunk_Element : Wav_Chunk_Element;
end case;
end record;
procedure Find_First_Chunk
(Chunks : Wav_Chunk_Elements;
Chunk_Tag : Wav_Chunk_Tag;
Found : out Wav_Chunk_Element_Found);
type RIFF_Information is
record
Id : RIFF_Identifier;
Format : RIFF_Format;
Chunks : Wav_Chunk_Elements;
end record;
procedure Create
(WF : in out Wavefile;
Mode : File_Mode := Out_File;
Name : String := "";
Form : String := "");
procedure Open
(WF : in out Wavefile;
Mode : File_Mode;
Name : String;
Form : String := "");
function Is_Open
(WF : Wavefile) return Boolean;
function End_Of_File
(WF : in out Wavefile) return Boolean
with Inline, Pre => Mode (WF) = In_File;
procedure Close (WF : in out Wavefile);
function Errors (WF : Wavefile) return Wavefile_Errors
with Inline;
function Warnings (WF : Wavefile) return Wavefile_Warnings
with Inline;
procedure Set_Format_Of_Wavefile
(WF : in out Wavefile;
Format : Wave_Format_Extensible)
with Pre => not Is_Open (WF);
function Format_Of_Wavefile
(W : Wavefile) return Wave_Format_Extensible;
function Number_Of_Channels
(W : Wavefile) return Positive;
function Bit_Depth
(W : Wavefile) return Wav_Bit_Depth;
function Sample_Rate
(W : Wavefile) return Wav_Sample_Rate;
function Mode
(W : Wavefile) return File_Mode;
function Name
(W : Wavefile) return String;
procedure Get_RIFF_Info
(WF : in out Wavefile;
Info : out RIFF_Information)
with Pre => Is_Open (WF);
subtype Sample_Count is Long_Long_Integer;
function Current_Sample
(WF : Wavefile) return Sample_Count;
function First_Sample
(WF : Wavefile) return Sample_Count;
function Last_Sample
(WF : Wavefile) return Sample_Count;
function Total_Sample_Count
(WF : Wavefile) return Sample_Count;
procedure Set_Current_Sample
(WF : in out Wavefile;
Position : Sample_Count)
with Pre => (Mode (WF) = In_File
and Position >= WF.First_Sample
and Position <= WF.Last_Sample);
subtype Wavefile_Time_In_Seconds is Long_Long_Float;
function Current_Time
(WF : Wavefile) return Wavefile_Time_In_Seconds;
function End_Time
(WF : Wavefile) return Wavefile_Time_In_Seconds;
procedure Set_Current_Time
(WF : in out Wavefile;
At_Time : Wavefile_Time_In_Seconds)
with Pre => Mode (WF) = In_File;
function Is_Supported_Format
(W : Wave_Format_Extensible) return Boolean;
private
--
-- Constants that indicate a range of
-- "First_Sample_Count .. <total_sample_count> - Total_To_Last_Diff"
--
-- Range used in this implementation: "0 .. <total_sample_count> - 1"
--
-- You can change this range to "1 .. <total_sample_count>" by changing
-- the constants as follows:
--
-- First_Sample_Count : constant Sample_Count := 1;
-- Total_To_Last_Diff : constant Sample_Count := 0;
--
First_Sample_Count : constant Sample_Count := 0;
Total_To_Last_Diff : constant Sample_Count := 1;
type Sample_Info is
record
Current : Sample_Count;
Total : Sample_Count;
end record
with Dynamic_Predicate =>
Sample_Info.Current in
First_Sample_Count .. Sample_Info.Total - Total_To_Last_Diff + 1;
-- Note: the "+ 1" above indicates that the Current counter can be in the
-- "end of file" position after a call to Get.
procedure Set_Error (WF : in out Wavefile;
Error_Code : Wavefile_Error_Code);
procedure Reset_Errors (WF : in out Wavefile);
procedure Set_Warning (WF : in out Wavefile;
Warning_Code : Wavefile_Warning_Code);
procedure Reset_Warnings (WF : in out Wavefile);
type Wavefile is tagged limited
record
Is_Opened : Boolean := False;
File : Ada.Streams.Stream_IO.File_Type;
File_Access : Ada.Streams.Stream_IO.Stream_Access;
Wave_Format : Wave_Format_Extensible := Default;
Sample_Pos : Sample_Info;
RIFF_Info : RIFF_Information;
Errors : Wavefile_Errors := (others => False);
Warnings : Wavefile_Warnings := (others => False);
end record;
function First_Sample
(WF : Wavefile) return Sample_Count is (First_Sample_Count);
function Is_Open
(WF : Wavefile) return Boolean is (WF.Is_Opened);
function Errors (WF : Wavefile) return Wavefile_Errors is
(WF.Errors);
function Warnings (WF : Wavefile) return Wavefile_Warnings is
(WF.Warnings);
end Audio.Wavefiles;
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