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281 | ------------------------------------------------------------------------------
-- --
-- WAVEFILES --
-- --
-- Wavefile reading routines --
-- --
-- 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.Text_IO; use Ada.Text_IO;
with Interfaces;
with Audio.RIFF; use Audio.RIFF;
with Audio.Wavefiles.Internals; use Audio.Wavefiles.Internals;
with Audio.Wavefiles.Report;
package body Audio.Wavefiles.Read is
procedure Parse_Fmt_Chunk
(WF : in out Wavefile);
procedure Parse_Data_Chunk
(WF : in out Wavefile);
---------------------
-- Parse_Fmt_Chunk --
---------------------
procedure Parse_Fmt_Chunk
(WF : in out Wavefile)
is
Verbose : constant Boolean := False;
use type Ada.Streams.Stream_IO.Count;
Found : Wav_Chunk_Element_Found;
begin
Find_First_Chunk (Chunks => WF.RIFF_Info.Chunks,
Chunk_Tag => Wav_Chunk_Fmt,
Found => Found);
if not Found.Success then
WF.Set_Error (Wavefile_Error_Format_Chuck_Not_Found);
return;
else
Set_File_Index_To_Chunk_Data_Start (WF.File,
Found.Chunk_Element.Start_Index);
case Found.Chunk_Element.Size is
when Wave_Format_Chunk_Size'Enum_Rep (Wave_Format_16_Size) =>
Wave_Format_16'Read (WF.File_Access,
Wave_Format_16 (WF.Wave_Format));
Reset_For_Wave_Format_16 (WF.Wave_Format);
when Wave_Format_Chunk_Size'Enum_Rep (Wave_Format_18_Size) =>
Wave_Format_18'Read (WF.File_Access,
Wave_Format_18 (WF.Wave_Format));
Reset_For_Wave_Format_18 (WF.Wave_Format);
if Verbose then
Put_Line ("Size of waveformat record "
& Integer'Image (
Wave_Format_18'Value_Size / 8));
Put_Line ("BitsPerSample: "
& Positive'Image
(To_Positive (WF.Wave_Format.Bits_Per_Sample)));
Put_Line ("Size: " & Interfaces.Unsigned_16'Image
(WF.Wave_Format.Size));
end if;
when Wave_Format_Chunk_Size'Enum_Rep
(Wave_Format_Extensible_Size) =>
Wave_Format_Extensible'Read (WF.File_Access,
WF.Wave_Format);
if Verbose then
Put_Line ("Size of waveformat record "
& Integer'Image
(Wave_Format_Extensible'Value_Size / 8));
Put_Line ("File index: " & Integer'Image (
Integer (Ada.Streams.Stream_IO.Index (WF.File))));
Put_Line ("BitsPerSample: "
& Positive'Image
(To_Positive (WF.Wave_Format.Bits_Per_Sample)));
Put_Line ("Size: " & Interfaces.Unsigned_16'Image
(WF.Wave_Format.Size));
end if;
when others =>
WF.Set_Error (Wavefile_Error_Unsupported_Format_Size);
return;
end case;
if Verbose then
Wavefiles.Report.Display_Info (WF);
Put_Line ("fmt chunk size: " & Long_Integer'Image
(Found.Chunk_Element.Size));
end if;
end if;
end Parse_Fmt_Chunk;
----------------------
-- Parse_Data_Chunk --
----------------------
procedure Parse_Data_Chunk
(WF : in out Wavefile)
is
Verbose : constant Boolean := False;
Found : Wav_Chunk_Element_Found;
begin
Find_First_Chunk (Chunks => WF.RIFF_Info.Chunks,
Chunk_Tag => Wav_Chunk_Data,
Found => Found);
if not Found.Success then
WF.Set_Error (Wavefile_Error_Data_Chuck_Not_Found);
return;
else
Set_File_Index_To_Chunk_Data_Start (WF.File,
Found.Chunk_Element.Start_Index);
if Verbose then
Put_Line ("RIFF Tag: " & Found.Chunk_Element.ID);
end if;
WF.Sample_Pos :=
(Current => First_Sample_Count,
Total =>
Number_Of_Samples
(Chunk_Size => Found.Chunk_Element.Size,
Channels_In_Total => WF.Wave_Format.Channels,
Bits_Per_Sample => WF.Wave_Format.Bits_Per_Sample));
if Verbose then
Put_Line ("Data chunk size: "
& Long_Integer'Image (Found.Chunk_Element.Size));
Put_Line ("Num samples: "
& Sample_Count'Image (WF.Sample_Pos.Total));
end if;
end if;
end Parse_Data_Chunk;
---------------------------
-- Read_Until_Data_Start --
---------------------------
procedure Read_Until_Data_Start
(WF : in out Wavefile)
is
Verbose : constant Boolean := False;
begin
if WF.RIFF_Info.Chunks.Is_Empty then
Audio.Wavefiles.Read.Parse_Wav_Chunks (WF);
end if;
if Verbose then
Audio.Wavefiles.Report.Display_Info (WF.RIFF_Info);
end if;
Parse_Fmt_Chunk (WF);
Parse_Data_Chunk (WF);
end Read_Until_Data_Start;
----------------------
-- Parse_Wav_Chunks --
----------------------
procedure Parse_Wav_Chunks
(WF : in out Wavefile)
is
use Ada.Streams;
Prev_File_Index : constant Ada.Streams.Stream_IO.Positive_Count :=
Stream_IO.Index (WF.File);
Curr_File_Index : Ada.Streams.Stream_IO.Positive_Count;
Chunk_Header : RIFF_Chunk_Header;
Info : RIFF_Information renames WF.RIFF_Info;
begin
-- Set index to initial RIFF chunk
Ada.Streams.Stream_IO.Set_Index (WF.File, 1);
Info.Chunks.Clear;
Parse_RIFF_Header : declare
FOURCC : FOURCC_String;
begin
RIFF_Chunk_Header'Read (WF.File_Access, Chunk_Header);
FOURCC_String'Read (WF.File_Access, FOURCC);
Info.Id := To_RIFF_Identifier (Chunk_Header.ID);
Info.Format := To_RIFF_Format (FOURCC);
end Parse_RIFF_Header;
if Info.Id /= RIFF_Identifier_Unknown and then
Info.Format /= RIFF_Format_Unknown
then
loop
Curr_File_Index := Ada.Streams.Stream_IO.Index (WF.File);
RIFF_Chunk_Header'Read (WF.File_Access, Chunk_Header);
declare
Chunk_Element : constant Wav_Chunk_Element
:= (Chunk_Tag => To_Wav_Chunk_Tag (Chunk_Header.ID),
ID => Chunk_Header.ID,
Size => Long_Integer (Chunk_Header.Size),
Start_Index => Curr_File_Index,
Consolidated => True);
begin
Info.Chunks.Append (Chunk_Element);
end;
-- This is most probably an error in the wavefile:
exit when Natural (Chunk_Header.Size) = 0;
Skip_Bytes (WF.File, Chunk_Header.Size);
exit when Ada.Streams.Stream_IO.End_Of_File (WF.File);
end loop;
end if;
-- Setting file index back to previous location
Ada.Streams.Stream_IO.Set_Index (WF.File, Prev_File_Index);
end Parse_Wav_Chunks;
------------------------
-- Set_Current_Sample --
------------------------
procedure Set_Current_Sample
(WF : in out Wavefile;
Position : Sample_Count)
is
Found : Wav_Chunk_Element_Found;
begin
Find_First_Chunk (Chunks => WF.RIFF_Info.Chunks,
Chunk_Tag => Wav_Chunk_Data,
Found => Found);
if not Found.Success then
WF.Set_Error (Wavefile_Error_Data_Chuck_Not_Found);
return;
else
Set_File_Index_To_Chunk_Data_Start
(File => WF.File,
Chunk_Start_Index => Found.Chunk_Element.Start_Index,
Position_In_Chunk => Number_Of_Bytes
(Position => Position - WF.First_Sample,
Channels_In_Total => WF.Wave_Format.Channels,
Bits_Per_Sample => WF.Wave_Format.Bits_Per_Sample));
WF.Sample_Pos.Current := Position;
end if;
end Set_Current_Sample;
end Audio.Wavefiles.Read;
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