what is the simpliest way to play sound from array data in delphi
Is there any sim开发者_开发知识库ple function? I am searching something like that
Play(@data, 44000, 100 {time});
I have worked quite a lot with PCM audio manipulation. I always use this function when playing short sequences of custom waveform audio data:
var
PlaySoundStopper: PBoolean;
SoundPlayerActive: boolean = false;
procedure PlaySound(const Sound: TASSound);
var
hWave: HWAVEOUT;
hdr: TWaveHdr;
buf: PAnsiChar;
fmt: TWaveFormatEx;
i: Integer;
n: Integer;
begin
try
with fmt do
begin
wFormatTag := WAVE_FORMAT_PCM;
nChannels := length(Sound.Channels);
nSamplesPerSec := Sound.SampleRate;
wBitsPerSample := 32;
nAvgBytesPerSec := nChannels * nSamplesPerSec * wBitsPerSample div 8;
nBlockAlign := nChannels * wBitsPerSample div 8;
cbSize := 0;
end;
GetMem(buf, fmt.nChannels * length(Sound.Channels[0]) * sizeof(TASWaveformSample));
if length(Sound.Channels) = 1 then
CopyMemory(buf, @(Sound.Channels[0, 0]), length(Sound.Channels[0]) * sizeof(TASWaveformSample))
else
for i := 0 to high(Sound.Channels[0]) do
for n := 0 to high(Sound.Channels) do
CopyMemory(buf + sizeof(TASWaveformSample) * (i * fmt.nChannels + n), @(Sound.Channels[n, i]), sizeof(TASWaveformSample));
if waveOutOpen(@hWave, WAVE_MAPPER, @fmt, 0, 0, CALLBACK_NULL) <> MMSYSERR_NOERROR then
raise Exception.Create('SoundPlayerThread.Execute: waveOutOpen failed: ' + SysErrorMessage(GetLastError));
ZeroMemory(@hdr, sizeof(hdr));
with hdr do
begin
lpData := buf;
dwBufferLength := fmt.nChannels * length(Sound.Channels[0]) * sizeof(TASWaveformSample);
dwFlags := 0;
end;
try
SoundPlayerActive := true;
waveOutPrepareHeader(hWave, @hdr, sizeof(hdr));
waveOutWrite(hWave, @hdr, sizeof(hdr));
sleep(500);
while waveOutUnprepareHeader(hWave, @hdr, sizeof(hdr)) = WAVERR_STILLPLAYING do
if PlaySoundStopper^ then
begin
waveOutPause(hWave);
waveOutUnprepareHeader(hWave, @hdr, sizeof(hdr));
break;
end
else
sleep(100);
finally
SoundPlayerActive := false;
waveOutClose(hWave);
FreeMem(buf);
end;
except
on E: Exception do MessageBox(0, PChar(E.ClassName + ': ' + E.Message), 'Sound Playback Error', MB_ICONERROR);
end;
end;
where
type
TASWaveformSample = integer; // signed 32-bit; -2147483648..2147483647
TASWaveformSamples = packed array of TASWaveformSample; // one channel
PASSound = ^TASSound;
TASSound = record
Channels: packed array of TASWaveformSamples;
SampleRate: cardinal;
end;
A perhaps better way, is to use a thread for the playing. Then I do
var
OwnerForm: HWND; // = 0;
SndSource: PASSound; // = nil;
ThreadPlaying: boolean; // = false;
type
TSoundPlayerThread = class(TThread)
private
{ Private declarations }
protected
procedure Execute; override;
end;
implemented as
procedure TSoundPlayerThread.Execute;
var
hWave: HWAVEOUT;
hdr: TWaveHdr;
buf: PAnsiChar;
fmt: TWaveFormatEx;
i: Integer;
n: Integer;
begin
ThreadPlaying := true;
try
try
if not Assigned(SndSource) then
Exit;
with fmt do
begin
wFormatTag := WAVE_FORMAT_PCM;
nChannels := length(SndSource^.Channels);
nSamplesPerSec := SndSource^.SampleRate;
wBitsPerSample := 32;
nAvgBytesPerSec := nChannels * nSamplesPerSec * wBitsPerSample div 8;
nBlockAlign := nChannels * wBitsPerSample div 8;
cbSize := 0;
end;
GetMem(buf, fmt.nChannels * length(SndSource^.Channels[0]) * sizeof(TASWaveformSample));
if length(SndSource^.Channels) = 1 then
CopyMemory(buf, @(SndSource^.Channels[0, 0]), length(SndSource^.Channels[0]) * sizeof(TASWaveformSample))
else
for i := 0 to high(SndSource^.Channels[0]) do
for n := 0 to high(SndSource^.Channels) do
CopyMemory(buf + sizeof(TASWaveformSample) * (i * fmt.nChannels + n), @(SndSource^.Channels[n, i]), sizeof(TASWaveformSample));
if waveOutOpen(@hWave, WAVE_MAPPER, @fmt, 0, 0, CALLBACK_NULL) <> MMSYSERR_NOERROR then
raise Exception.Create('SoundPlayerThread.Execute: waveOutOpen failed: ' + SysErrorMessage(GetLastError));
ZeroMemory(@hdr, sizeof(hdr));
with hdr do
begin
lpData := buf;
dwBufferLength := fmt.nChannels * length(SndSource^.Channels[0]) * sizeof(TASWaveformSample);
dwFlags := 0;
end;
waveOutPrepareHeader(hWave, @hdr, sizeof(hdr));
waveOutWrite(hWave, @hdr, sizeof(hdr));
sleep(500);
while waveOutUnprepareHeader(hWave, @hdr, sizeof(hdr)) = WAVERR_STILLPLAYING do
begin
sleep(100);
if Terminated then
waveOutReset(hWave);
end;
waveOutClose(hWave);
FreeMem(buf);
except
on E: Exception do MessageBox(0, PChar(E.ClassName + ': ' + E.Message), 'TSoundPlayerThread', MB_ICONERROR);
end;
finally
ThreadPlaying := false;
end;
end;
Wave Audio Package has TLiveAudioPlayer component. It plays audio from buffer.
The Win32 API PlaySound function can play standard RIFF-encoded audio (such as WAV audio) from a memory block by using its SND_MEMORY
flag. Alternatively, if the audio is in the app's resources, you can use the SND_RESOURCE
flag instead.
Microsoft has a Knowledge Base article telling you how you can play sound from memory using MCI. You'll probably need to have the wave file header in your array, or otherwise copy in the right data during the first read, but other than that it should be fairly easy to port over.
I couldn't find a complete solution that isn't based on the outdated sndPlaySound, so here are two functions that play ".wav" files from both a TMemoryStream and from a file :
uses mmsystem;
procedure PlaySoundFromFile(FileName : String);
var
mStream : TMemoryStream;
begin
mStream := TMemoryStream.Create;
Try mStream.LoadFromFile(FileName); Except End;
If mStream.Size > 0 then PlaySoundFromStream(mStream);
mStream.Free;
end;
procedure PlaySoundFromStream(mStream : TMemoryStream);
begin
PlaySound(mStream.Memory,0,SND_MEMORY or SND_SYNC);
end;
The sound is played synchronously and from memory, you can find the other PlaySound flags in the link on Remy's answer. If you switch to async playback, make sure to not clear the sound memory before playback ends.
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