¿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.