ppapi/cpp/audio_buffer.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef PPAPI_CPP_AUDIO_BUFFER_H_
   6 #define PPAPI_CPP_AUDIO_BUFFER_H_
   7
   8 #include "ppapi/c/ppb_audio_buffer.h"
   9 #include "ppapi/cpp/resource.h"
  10
  11 namespace pp {
  12
  13 class AudioBuffer : public Resource {
  14  public:
  15   /// Default constructor for creating an is_null()
  16   /// <code>AudioBuffer</code> object.
  17   AudioBuffer();
  18
  19   /// The copy constructor for <code>AudioBuffer</code>.
  20   ///
  21   /// @param[in] other A reference to an <code>AudioBuffer</code>.
  22   AudioBuffer(const AudioBuffer& other);
  23
  24   /// Constructs an <code>AudioBuffer</code> from a <code>Resource</code>.
  25   ///
  26   /// @param[in] resource A <code>PPB_AudioBuffer</code> resource.
  27   explicit AudioBuffer(const Resource& resource);
  28
  29   /// A constructor used when you have received a <code>PP_Resource</code> as a
  30   /// return value that has had 1 ref added for you.
  31   ///
  32   /// @param[in] resource A <code>PPB_AudioBuffer</code> resource.
  33   AudioBuffer(PassRef, PP_Resource resource);
  34
  35   virtual ~AudioBuffer();
  36
  37   /// Gets the timestamp of the audio buffer.
  38   ///
  39   /// @return A <code>PP_TimeDelta</code> containing the timestamp of the audio
  40   /// buffer. Given in seconds since the start of the containing audio stream.
  41   PP_TimeDelta GetTimestamp() const;
  42
  43   /// Sets the timestamp of the audio buffer.
  44   ///
  45   /// @param[in] timestamp A <code>PP_TimeDelta</code> containing the timestamp
  46   /// of the audio buffer. Given in seconds since the start of the containing
  47   /// audio stream.
  48   void SetTimestamp(PP_TimeDelta timestamp);
  49
  50   /// Gets the sample rate of the audio buffer.
  51   ///
  52   /// @return The sample rate of the audio buffer.
  53   PP_AudioBuffer_SampleRate GetSampleRate() const;
  54
  55   /// Gets the sample size of the audio buffer in bytes.
  56   ///
  57   /// @return The sample size of the audio buffer in bytes.
  58   PP_AudioBuffer_SampleSize GetSampleSize() const;
  59
  60   /// Gets the number of channels in the audio buffer.
  61   ///
  62   /// @return The number of channels in the audio buffer.
  63   uint32_t GetNumberOfChannels() const;
  64
  65   /// Gets the number of samples in the audio buffer.
  66   ///
  67   /// @return The number of samples in the audio buffer.
  68   /// For example, at a sampling rate of 44,100 Hz in stereo audio, a buffer
  69   /// containing 4,410 * 2 samples would have a duration of 100 milliseconds.
  70   uint32_t GetNumberOfSamples() const;
  71
  72   /// Gets the data buffer containing the audio buffer samples.
  73   ///
  74   /// @return A pointer to the beginning of the data buffer.
  75   void* GetDataBuffer();
  76
  77   /// Gets the size of data buffer in bytes.
  78   ///
  79   /// @return The size of the data buffer in bytes.
  80   uint32_t GetDataBufferSize() const;
  81 };
  82
  83 }  // namespace pp
  84
  85 #endif  // PPAPI_CPP_AUDIO_BUFFER_H_