ccAudio
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DTMFDetect is used for detecting DTMF tones in a stream of audio. More...
#include <audio2.h>
Public Member Functions | |
DTMFDetect () | |
~DTMFDetect () | |
int | putSamples (Linear buffer, int count) |
This routine is used to push linear audio data into the dtmf tone detection analysizer. More... | |
int | getResult (char *data, int size) |
Copy detected dtmf results into a data buffer. More... | |
Protected Member Functions | |
void | goertzelInit (goertzel_state_t *s, tone_detection_descriptor_t *t) |
void | goertzelUpdate (goertzel_state_t *s, Sample x[], int samples) |
float | goertzelResult (goertzel_state_t *s) |
Additional Inherited Members | |
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enum | Rate { rateUnknown, rate6khz = 6000, rate8khz = 8000, rate16khz = 16000, rate32khz = 32000, rate44khz = 44100 } |
Audio encoding rate, samples per second. More... | |
enum | Mode { modeRead, modeReadAny, modeReadOne, modeWrite, modeCache, modeInfo, modeFeed, modeAppend, modeCreate } |
File processing mode, whether to skip missing files, etc. More... | |
enum | Encoding { unknownEncoding = 0, g721ADPCM, g722Audio, g722_7bit, g722_6bit, g723_2bit, g723_3bit, g723_5bit, gsmVoice, msgsmVoice, mulawAudio, alawAudio, mp1Audio, mp2Audio, mp3Audio, okiADPCM, voxADPCM, sx73Voice, sx96Voice, cdaStereo, cdaMono, pcm8Stereo, pcm8Mono, pcm16Stereo, pcm16Mono, pcm32Stereo, pcm32Mono, speexVoice, speexAudio, g729Audio, ilbcAudio, speexUltra, speexNarrow = speexVoice, speexWide = speexAudio, g723_4bit = g721ADPCM } |
Audio encoding formats. More... | |
enum | Format { raw, snd, riff, mpeg, wave } |
Audio container file format. More... | |
enum | DeviceMode { PLAY, RECORD, PLAYREC } |
Audio device access mode. More... | |
enum | Error { errSuccess = 0, errReadLast, errNotOpened, errEndOfFile, errStartOfFile, errRateInvalid, errEncodingInvalid, errReadInterrupt, errWriteInterrupt, errReadFailure, errWriteFailure, errReadIncomplete, errWriteIncomplete, errRequestInvalid, errTOCFailed, errStatFailed, errInvalidTrack, errPlaybackFailed, errNotPlaying, errNoCodec } |
Audio error conditions. More... | |
typedef int16_t | snd16_t |
typedef int32_t | snd32_t |
typedef int16_t | Level |
typedef int16_t | Sample |
typedef int16_t * | Linear |
typedef unsigned long | timeout_t |
typedef unsigned char * | Encoded |
typedef enum Rate | Rate |
typedef enum Mode | Mode |
typedef enum Encoding | Encoding |
typedef enum Format | Format |
typedef enum DeviceMode | DeviceMode |
typedef enum Error | Error |
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static Level | tolevel (float dbm) |
Convert dbm power level to integer value (0-32768). More... | |
static float | todbm (Level power) |
Convert integer power levels to dbm. More... | |
static bool | hasDevice (unsigned device=0) |
Test for the presense of a specified (indexed) audio device. More... | |
static AudioDevice * | getDevice (unsigned device=0, DeviceMode mode=PLAY) |
Get a audio device object that can be used to play or record audio. More... | |
static const char * | getCodecPath (void) |
Get pathname to where loadable codec modules are stored. More... | |
static const char * | getMIME (Info &info) |
Get the mime descriptive type for a given Audio encoding description, usually retrieved from a newly opened audio file. More... | |
static const char * | getName (Encoding encoding) |
Get the short ascii description used for the given audio encoding type. More... | |
static const char * | getExtension (Encoding encoding) |
Get the preferred file extension name to use for a given audio encoding type. More... | |
static Encoding | getEncoding (const char *name) |
Get the audio encoding format that is specified by a short ascii name. More... | |
static Encoding | getStereo (Encoding encoding) |
Get the stereo encoding format associated with the given format. More... | |
static Encoding | getMono (Encoding encoding) |
Get the mono encoding format associated with the given format. More... | |
static bool | isLinear (Encoding encoding) |
Test if the audio encoding format is a linear one. More... | |
static bool | isBuffered (Encoding encoding) |
Test if the audio encoding format must be packetized (that is, has irregular sized frames) and must be processed only through buffered codecs. More... | |
static bool | isMono (Encoding encoding) |
Test if the audio encoding format is a mono format. More... | |
static bool | isStereo (Encoding encoding) |
Test if the audio encoding format is a stereo format. More... | |
static Rate | getRate (Encoding encoding) |
Return default sample rate associated with the specified audio encoding format. More... | |
static Rate | getRate (Encoding e, Rate request) |
Return optional rate setting effect. More... | |
static timeout_t | getFraming (Encoding encoding, timeout_t timeout=0) |
Return frame timing for an audio encoding format. More... | |
static timeout_t | getFraming (Info &info, timeout_t timeout=0) |
Return frame time for an audio source description. More... | |
static bool | isEndian (Encoding encoding) |
Test if the endian byte order of the encoding format is different from the machine's native byte order. More... | |
static bool | isEndian (Info &info) |
Test if the endian byte order of the audio source description is different from the machine's native byte order. More... | |
static bool | swapEndian (Encoding encoding, void *buffer, unsigned number) |
Optionally swap endian of audio data if the encoding format endian byte order is different from the machine's native endian. More... | |
static void | swapEncoded (Info &info, Encoded data, size_t bytes) |
Optionally swap endian of encoded audio data based on the audio encoding type, and relationship to native byte order. More... | |
static bool | swapEndian (Info &info, void *buffer, unsigned number) |
Optionally swap endian of audio data if the audio source description byte order is different from the machine's native endian byte order. More... | |
static Level | getImpulse (Encoding encoding, void *buffer, unsigned number) |
Get the energey impulse level of a frame of audio data. More... | |
static Level | getImpulse (Info &info, void *buffer, unsigned number=0) |
Get the energey impulse level of a frame of audio data. More... | |
static Level | getPeak (Encoding encoding, void *buffer, unsigned number) |
Get the peak (highest energy) level found in a frame of audio data. More... | |
static Level | getPeak (Info &info, void *buffer, unsigned number=0) |
Get the peak (highest energy) level found in a frame of audio data. More... | |
static void | toTimestamp (timeout_t duration, char *address, size_t size) |
Provide ascii timestamp representation of a timeout value. More... | |
static timeout_t | toTimeout (const char *timestamp) |
Convert ascii timestamp representation to a timeout number. More... | |
static int | getFrame (Encoding encoding, int samples=0) |
Returns the number of bytes in a sample frame for the given encoding type, rounded up to the nearest integer. More... | |
static int | getCount (Encoding encoding) |
Returns the number of samples in all channels for a frame in the given encoding. More... | |
static unsigned long | toSamples (Encoding encoding, size_t bytes) |
Compute byte counts of audio data into number of samples based on the audio encoding format used. More... | |
static unsigned long | toSamples (Info &info, size_t bytes) |
Compute byte counts of audio data into number of samples based on the audio source description used. More... | |
static size_t | toBytes (Info &info, unsigned long number) |
Compute the number of bytes a given number of samples in a given audio encoding will occupy. More... | |
static size_t | toBytes (Encoding encoding, unsigned long number) |
Compute the number of bytes a given number of samples in a given audio encoding will occupy. More... | |
static void | fill (unsigned char *address, int number, Encoding encoding) |
Fill an audio buffer with "empty" (silent) audio data, based on the audio encoding format. More... | |
static bool | loadPlugin (const char *path) |
Load a dso plugin (codec plugin), used internally... More... | |
static size_t | maxFramesize (Info &info) |
Maximum framesize for a given coding that may be needed to store a result. More... | |
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static const unsigned | ndata |
DTMFDetect is used for detecting DTMF tones in a stream of audio.
It currently only supports 8000Hz input.
ost::DTMFDetect::DTMFDetect | ( | ) |
ost::DTMFDetect::~DTMFDetect | ( | ) |
int ost::DTMFDetect::getResult | ( | char * | data, |
int | size | ||
) |
Copy detected dtmf results into a data buffer.
data | buffer to copy into. |
size | of data buffer to copy into. |
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int ost::DTMFDetect::putSamples | ( | Linear | buffer, |
int | count | ||
) |
This routine is used to push linear audio data into the dtmf tone detection analysizer.
It may be called multiple times and results fetched later.
buffer | of audio data in native machine endian to analysize. |
count | of samples to analysize from buffer. |