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WavAudioCursor Class Reference

Used for reading PCM .wav files. More...

#include "wavAudioCursor.h"

Inheritance diagram for WavAudioCursor:
MovieAudioCursor TypedWritableReferenceCount TypedWritable ReferenceCount TypedObject MemoryBase MemoryBase

Public Member Functions

 WavAudioCursor (WavAudio *src, istream *stream)
 Reads the .wav header from the indicated stream. More...
 
virtual ~WavAudioCursor ()
 xxx More...
 
virtual TypeHandle force_init_type ()
 
virtual TypeHandle get_type () const
 
virtual void read_samples (int n, PN_int16 *data)
 Read audio samples from the stream. More...
 
virtual void seek (double offset)
 Seeks to a target location. More...
 
- Public Member Functions inherited from MovieAudioCursor
 MovieAudioCursor (MovieAudio *src)
 This constructor returns a null audio stream — a stream of total silence, at 8000 samples per second. More...
 
bool aborted () const
 If aborted is true, it means that the "ready" samples are not being replenished. More...
 
int audio_channels () const
 Returns the number of audio channels (ie, two for stereo, one for mono). More...
 
int audio_rate () const
 
bool can_seek () const
 Returns true if the movie can seek. More...
 
bool can_seek_fast () const
 Returns true if seek operations are constant time. More...
 
double length () const
 Returns the length of the movie. More...
 
 PT (MovieAudio) get_source() const
 
void read_samples (int n, Datagram *dg)
 Read audio samples from the stream into a Datagram. More...
 
string read_samples (int n)
 Read audio samples from the stream and returns them as a string. More...
 
virtual int ready () const
 Returns the number of audio samples that are ready to read. More...
 
void skip_samples (int n)
 Skip audio samples from the stream. More...
 
double tell () const
 Returns the current offset within the file. More...
 
- Public Member Functions inherited from TypedWritableReferenceCount
 TypedWritableReferenceCount (const TypedWritableReferenceCount &copy)
 
virtual ReferenceCountas_reference_count ()
 Returns the pointer cast to a ReferenceCount pointer, if it is in fact of that type. More...
 
void operator= (const TypedWritableReferenceCount &copy)
 
- Public Member Functions inherited from TypedWritable
 TypedWritable (const TypedWritable &copy)
 
virtual int complete_pointers (TypedWritable **p_list, BamReader *manager)
 Receives an array of pointers, one for each time manager->read_pointer() was called in fillin(). More...
 
string encode_to_bam_stream () const
 Converts the TypedWritable object into a single stream of data using a BamWriter, and returns that data as a string string. More...
 
bool encode_to_bam_stream (string &data, BamWriter *writer=NULL) const
 Converts the TypedWritable object into a single stream of data using a BamWriter, and stores that data in the indicated string. More...
 
virtual void fillin (DatagramIterator &scan, BamReader *manager)
 This internal function is intended to be called by each class's make_from_bam() method to read in all of the relevant data from the BamFile for the new object. More...
 
virtual void finalize (BamReader *manager)
 Called by the BamReader to perform any final actions needed for setting up the object after all objects have been read and all pointers have been completed. More...
 
UpdateSeq get_bam_modified () const
 Returns the current bam_modified counter. More...
 
void mark_bam_modified ()
 Increments the bam_modified counter, so that this object will be invalidated and retransmitted on any open bam streams. More...
 
void operator= (const TypedWritable &copy)
 
virtual bool require_fully_complete () const
 Some objects require all of their nested pointers to have been completed before the objects themselves can be completed. More...
 
virtual void update_bam_nested (BamWriter *manager)
 Called by the BamWriter when this object has not itself been modified recently, but it should check its nested objects for updates. More...
 
virtual void write_datagram (BamWriter *manager, Datagram &dg)
 Writes the contents of this object to the datagram for shipping out to a Bam file. More...
 
- Public Member Functions inherited from TypedObject
 TypedObject (const TypedObject &copy)
 
TypedObjectas_typed_object ()
 Returns the object, upcast (if necessary) to a TypedObject pointer. More...
 
const TypedObjectas_typed_object () const
 Returns the object, upcast (if necessary) to a TypedObject pointer. More...
 
int get_best_parent_from_Set (const std::set< int > &) const
 
int get_type_index () const
 Returns the internal index number associated with this object's TypeHandle, a unique number for each different type. More...
 
bool is_exact_type (TypeHandle handle) const
 Returns true if the current object is the indicated type exactly. More...
 
bool is_of_type (TypeHandle handle) const
 Returns true if the current object is or derives from the indicated type. More...
 
void operator= (const TypedObject &copy)
 
- Public Member Functions inherited from ReferenceCount
int get_ref_count () const
 Returns the current reference count. More...
 
WeakReferenceListget_weak_list () const
 Returns the WeakReferenceList associated with this ReferenceCount object. More...
 
bool has_weak_list () const
 Returns true if this particular ReferenceCount object has a WeakReferenceList created, false otherwise. More...
 
void local_object ()
 This function should be called, once, immediately after creating a new instance of some ReferenceCount-derived object on the stack. More...
 
void ref () const
 Explicitly increments the reference count. More...
 
bool test_ref_count_integrity () const
 Does some easy checks to make sure that the reference count isn't completely bogus. More...
 
bool test_ref_count_nonzero () const
 Does some easy checks to make sure that the reference count isn't zero, or completely bogus. More...
 
virtual bool unref () const
 Explicitly decrements the reference count. More...
 
void weak_ref (WeakPointerToVoid *ptv)
 Adds the indicated PointerToVoid as a weak reference to this object. More...
 
void weak_unref (WeakPointerToVoid *ptv)
 Removes the indicated PointerToVoid as a weak reference to this object. More...
 

Static Public Member Functions

static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from MovieAudioCursor
static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from TypedWritableReferenceCount
static TypeHandle get_class_type ()
 
static void init_type ()
 
static PT (TypedWritableReferenceCount) decode_from_bam_stream(const string &data
 
- Static Public Member Functions inherited from TypedWritable
static bool decode_raw_from_bam_stream (TypedWritable *&ptr, ReferenceCount *&ref_ptr, const string &data, BamReader *reader=NULL)
 Reads the string created by a previous call to encode_to_bam_stream(), and extracts the single object on that string. More...
 
static TypeHandle get_class_type ()
 
static void init_type ()
 
- Static Public Member Functions inherited from TypedObject
static TypeHandle get_class_type ()
 
static void init_type ()
 This function is declared non-inline to work around a compiler bug in g++ 2.96. More...
 
- Static Public Member Functions inherited from ReferenceCount
static TypeHandle get_class_type ()
 
static void init_type ()
 

Public Attributes

bool _is_valid
 
- Public Attributes inherited from TypedWritableReferenceCount
static BamReaderreader = NULL)
 

Additional Inherited Members

- Static Public Attributes inherited from TypedWritable
static TypedWritable *const Null = (TypedWritable*)0L
 

Detailed Description

Used for reading PCM .wav files.

Supported formats are linear PCM, IEEE float, A-law and mu-law.

Definition at line 29 of file wavAudioCursor.h.

Constructor & Destructor Documentation

WavAudioCursor::WavAudioCursor ( WavAudio src,
istream *  stream 
)

Reads the .wav header from the indicated stream.

This leaves the read pointer positioned at the start of the data.

Definition at line 101 of file wavAudioCursor.cxx.

References StreamReader::extract_bytes(), StreamReader::get_uint16(), StreamReader::get_uint32(), and StreamReader::skip_bytes().

WavAudioCursor::~WavAudioCursor ( )
virtual

Member Function Documentation

void WavAudioCursor::read_samples ( int  n,
PN_int16 *  data 
)
virtual

Read audio samples from the stream.

N is the number of samples you wish to read. Your buffer must be equal in size to N * channels. Multiple-channel audio will be interleaved.

Reimplemented from MovieAudioCursor.

Definition at line 341 of file wavAudioCursor.cxx.

References StreamReader::extract_bytes(), StreamReader::get_float32(), StreamReader::get_float64(), StreamReader::get_int16(), StreamReader::get_int32(), StreamReader::get_int64(), StreamReader::get_uint8(), and StreamReader::skip_bytes().

void WavAudioCursor::seek ( double  t)
virtual

Seeks to a target location.

Afterward, the packet_time is guaranteed to be less than or equal to the specified time.

Reimplemented from MovieAudioCursor.

Definition at line 301 of file wavAudioCursor.cxx.

References StreamReader::skip_bytes().


The documentation for this class was generated from the following files: