¿Cuál es la forma más sencilla de reproducir sonido a partir de datos de matriz en Delphi?

audio multimedia

Question

¿Hay alguna función simple? Estoy buscando algo así

Reproducir (@data, 44000, 100 {time});

Answer 1

He trabajado bastante con la manipulación de audio PCM. Siempre utilizo esta función cuando reproduzco secuencias cortas de datos de audio de forma de onda personalizados:

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;

dónde

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;

Una forma quizás mejor, es usar un hilo para tocar. Entonces lo hago

var
OwnerForm: HWND; // = 0;
SndSource: PASSound; // = nil;
ThreadPlaying: boolean; // = false;
type
TSoundPlayerThread = class(TThread)
private
{ Private declarations }
protected
procedure Execute; override;
end;

implementado como

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;

Answer 2

La función Win32 API PlaySound puede reproducir audio estándar con codificación RIFF (como audio WAV) desde un bloque de memoria mediante el uso de su indicador SND_MEMORY . Alternativamente, si el audio está en los recursos de la aplicación, puede usar el indicador SND_RESOURCE lugar.

Answer 3

Microsoft tiene un artículo de Knowledge Base que le dice cómo puede reproducir el sonido de la memoria usando MCI. Probablemente necesites tener el encabezado del archivo Wave en tu matriz, o copiar los datos correctos durante la primera lectura, pero aparte de eso, debería ser bastante fácil de sobrepasar.

Answer 4

Wave Audio Package tiene el componente TLiveAudioPlayer. Reproduce audio desde el búfer.