spandsp 0.0.6

tone_generate.h File Reference

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## Macros
#define | make_tone_gen_descriptor tone_gen_descriptor_init

## Typedefs
typedef struct tone_gen_tone_descriptor_s | tone_gen_tone_descriptor_t
typedef struct tone_gen_descriptor_s | tone_gen_descriptor_t
typedef struct tone_gen_state_s | tone_gen_state_t

## Functions
tone_gen_descriptor_t * | tone_gen_descriptor_init (tone_gen_descriptor_t *s, int f1, int l1, int f2, int l2, int d1, int d2, int d3, int d4, int repeat)
| Create a tone generator descriptor.
void | tone_gen_descriptor_free (tone_gen_descriptor_t *s)
| SPAN_DECLARE_NONSTD (int) tone_gen(tone_gen_state_t *s
| Get the next bit of a transmitted serial bit stream.
tone_gen_state_t * | tone_gen_init (tone_gen_state_t *s, tone_gen_descriptor_t *t)
int | tone_gen_release (tone_gen_state_t *s)
int | tone_gen_free (tone_gen_state_t *s)

## Variables
int16_t | amp []
int16_t int | max_samples

## Typedef Documentation

## ◆ tone_gen_descriptor_t

typedef struct tone_gen_descriptor_s tone_gen_descriptor_t

Cadenced multi-tone generator descriptor.

## ◆ tone_gen_state_t

typedef struct tone_gen_state_s tone_gen_state_t

Cadenced multi-tone generator state descriptor. This defines the state of a single working instance of a generator.

## Function Documentation

## ◆ SPAN_DECLARE_NONSTD()

SPAN_DECLARE_NONSTD | ( | int |  | ) |

Get the next bit of a transmitted serial bit stream.

Get the next bit of data from a T.38 rate adapting non-ECM buffer context.

Get a bit of received non-ECM image data.

Process a block of received V.8 audio samples.

Fake processing of a missing block of received V.29 modem audio samples.

Fake processing of a missing block of received V.27ter modem audio samples.

Generate a block of V.22bis modem audio samples.

Fake processing of a missing block of received V.22bis modem audio samples.

Process a block of received V.18 audio samples.

Fake processing of a missing block of received V.17 modem audio samples.

Generate a block of FAX audio samples.

Apply fake received audio processing.

Process a received T.38 IFP packet from a reliable stream (e.g. TCP).

Generate a block of T.31 modem audio samples.

Fake processing of a missing block of received T.31 modem audio samples.

Dummy receive fillin callback.

Dummy receive callback.

Process a block of samples through an instance of the modem connect tones detector.

Get the next sequence of bytes for transmission.

Get the next byte for transmission.

Fake processing of a missing block of received FSK modem audio samples.

Process a block of received FSK modem audio samples.

Apply T.30 transmit processing to generate a block of audio samples.

Apply fake T.30 receive processing.

Get the next bit of a transmitted serial bit stream.

Parameters

  user_data | An opaque point which must point to a transmitter context.

Returns
  the next bit, or PUTBIT_END_OF_DATA to indicate the data stream has ended.

Apply fake T.30 receive processing when a block of audio samples is missing (e.g due to packet loss).

Parameters

  s | The FAX context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

Apply T.30 transmit processing to generate a block of audio samples.

Parameters

  s | The FAX context.
  amp | The audio sample buffer.
  max_len | The number of samples to be generated.

Returns
  The number of samples actually generated. This will be zero when there is nothing to send.

Process a block of received FSK modem audio samples.

Parameters

  s | The modem context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Returns
  The number of samples unprocessed.

Fake processing of a missing block of received FSK modem audio samples (e.g due to packet loss).

Parameters

  s | The modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Parameters

  s | A pointer to an HDLC transmitter context.

Returns
  The next byte for transmission.

Parameters

  s | A pointer to an HDLC transmitter context.
  buf | The buffer for the data.
  max_len | The number of bytes to get.

Returns
  The number of bytes actually got.

Parameters

  s | The context.
  amp | An array of signal samples.
  len | The number of samples in the array.

Returns
  The number of unprocessed samples.

A dummy routine to use as a receive callback, when we aren't really trying to process what is received. It just absorbs and ignores the data.

Parameters

  user_data | The context.
  amp | The signal.buffer
  len | The length of the signal buffer

Returns
  0.

A dummy routine to use as a receive fillin callback, when we aren't really trying to process what is received. It just absorbs and ignores the request.

Parameters

  user_data | The context.
  len | The length of the signal buffer

Returns
  0.

Fake processing of a missing block of received T.31 modem audio samples (e.g due to packet loss).

Parameters

  s | The T.31 modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Generate a block of T.31 modem audio samples.

Parameters

  s | The T.31 modem context.
  amp | The audio sample buffer.
  max_len | The number of samples to be generated.

Returns
  The number of samples actually generated.

Parameters

  s | The T.38 context.
  buf | The packet contents.
  len | The length of the packet contents.
  seq_no | The packet sequence number, used for logging purposes.

Returns
  The length of the packet processed, or -1 if there is an error in the packet, or too few bytes of data to complete it.

Apply fake processing when a block of audio samples is missing (e.g due to packet loss).

Parameters

  s | The T.38 context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

Generate a block of FAX audio samples.

Parameters

  s | The T.38 context.
  amp | The audio sample buffer.
  max_len | The number of samples to be generated.

Returns
  The number of samples actually generated.

Fake processing of a missing block of received V.17 modem audio samples. (e.g due to packet loss).

Parameters

  s | The modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Process a block of received V.18 audio samples.

Parameters

  s | The V.18 context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Fake processing of a missing block of received V.22bis modem audio samples. (e.g due to packet loss).

Parameters

  s | The modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Generate a block of V.22bis modem audio samples.

Parameters

  s | The modem context.
  amp | The audio sample buffer.
  len | The number of samples to be generated.

Returns
  The number of samples actually generated.

Fake processing of a missing block of received V.27ter modem audio samples. (e.g due to packet loss).

Parameters

  s | The modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Fake processing of a missing block of received V.29 modem audio samples. (e.g due to packet loss).

Parameters

  s | The modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Process a block of received V.8 audio samples.

Parameters

  s | The V.8 context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Get the next bit of a transmitted serial bit stream.

Apply T.30 transmit processing to generate a block of audio samples.

Apply fake T.30 receive processing.

Apply T.30 receive processing to a block of audio samples.

Parameters

  s | The FAX context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Returns
  The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

Apply fake T.30 receive processing when a block of audio samples is missing (e.g due to packet loss).

Parameters

  s | The FAX context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

Apply T.30 transmit processing to generate a block of audio samples.

Parameters

  s | The FAX context.
  amp | The audio sample buffer.
  max_len | The number of samples to be generated.

Returns
  The number of samples actually generated. This will be zero when there is nothing to send.

Get the next bit of a transmitted serial bit stream.

Fake processing of a missing block of received FSK modem audio samples.

Process a block of received FSK modem audio samples.

Generate a block of FSK modem audio samples.

Parameters

  s | The modem context.
  amp | The audio sample buffer.
  len | The number of samples to be generated.

Returns
  The number of samples actually generated.

Process a block of received FSK modem audio samples.

Parameters

  s | The modem context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Returns
  The number of samples unprocessed.

Fake processing of a missing block of received FSK modem audio samples (e.g due to packet loss).

Parameters

  s | The modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Get the next bit of a transmitted serial bit stream.

Get the next sequence of bytes for transmission.

Get the next byte for transmission.

Parameters

  s | A pointer to an HDLC transmitter context.

Returns
  The next bit for transmission.

Parameters

  s | A pointer to an HDLC transmitter context.

Returns
  The next byte for transmission.

Parameters

  s | A pointer to an HDLC transmitter context.
  buf | The buffer for the data.
  max_len | The number of bytes to get.

Returns
  The number of bytes actually got.

Get the next bit of a transmitted serial bit stream.

Process a block of samples through an instance of the modem connect tones detector.

Parameters

  s | The context.
  amp | An array of signal samples.
  len | The number of samples to generate.

Returns
  The number of samples generated.

Parameters

  s | The context.
  amp | An array of signal samples.
  len | The number of samples in the array.

Returns
  The number of unprocessed samples.

Get the next bit of a transmitted serial bit stream.

Dummy receive fillin callback.

Dummy receive callback.

Generate a block of silent audio samples.

Parameters

  s | The silence generator context.
  amp | The audio sample buffer.
  max_len | The number of samples to be generated.

Returns
  The number of samples actually generated. This will be zero when there is nothing to send.

A dummy routine to use as a receive callback, when we aren't really trying to process what is received. It just absorbs and ignores the data.

Parameters

  user_data | The context.
  amp | The signal.buffer
  len | The length of the signal buffer

Returns
  0.

A dummy routine to use as a receive fillin callback, when we aren't really trying to process what is received. It just absorbs and ignores the request.

Parameters

  user_data | The context.
  len | The length of the signal buffer

Returns
  0.

Get the next bit of a transmitted serial bit stream.

Generate a block of T.31 modem audio samples.

Fake processing of a missing block of received T.31 modem audio samples.

Process a block of received T.31 modem audio samples.

Parameters

  s | The T.31 modem context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Returns
  The number of samples unprocessed.

Fake processing of a missing block of received T.31 modem audio samples (e.g due to packet loss).

Parameters

  s | The T.31 modem context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed.

Generate a block of T.31 modem audio samples.

Parameters

  s | The T.31 modem context.
  amp | The audio sample buffer.
  max_len | The number of samples to be generated.

Returns
  The number of samples actually generated.

Get the next bit of a transmitted serial bit stream.

Process a received T.38 IFP packet from a reliable stream (e.g. TCP).

Parameters

  s | The T.38 context.
  buf | The packet contents.
  len | The length of the packet contents.
  seq_no | The packet sequence number.

Returns
  0 for OK, else -1.

Parameters

  s | The T.38 context.
  buf | The packet contents.
  len | The length of the packet contents.
  seq_no | The packet sequence number, used for logging purposes.

Returns
  The length of the packet processed, or -1 if there is an error in the packet, or too few bytes of data to complete it.

Get the next bit of a transmitted serial bit stream.

Generate a block of FAX audio samples.

Apply fake received audio processing.

Process a block of received FAX audio samples.

Parameters

  s | The T.38 context.
  amp | The audio sample buffer.
  len | The number of samples in the buffer.

Returns
  The number of samples unprocessed.

Apply fake processing when a block of audio samples is missing (e.g due to packet loss).

Parameters

  s | The T.38 context.
  len | The number of samples to fake.

Returns
  The number of samples unprocessed. This should only be non-zero if the software has reached the end of the FAX call.

Generate a block of FAX audio samples.

Parameters

  s | The T.38 context.
  amp | The audio sample buffer.
  max_len | The number of samples to be generated.

Returns
  The number of samples actually generated.

## ◆ tone_gen_descriptor_init()

tone_gen_descriptor_t * tone_gen_descriptor_init | ( | tone_gen_descriptor_t * | s,
|  | int | f1,
|  | int | l1,
|  | int | f2,
|  | int | l2,
|  | int | d1,
|  | int | d2,
|  | int | d3,
|  | int | d4,
|  | int | repeat )

Create a tone generator descriptor.

Create a tone generator descriptor

Parameters

  s | The descriptor
  f1 | The first frequency, in Hz
  l1 | The level of the first frequency, in dBm0
  f2 | 0 for no second frequency, a positive number for the second frequency, in Hz, or a negative number for an AM modulation frequency, in Hz
  l2 | The level of the second frequency, in dBm0, or the percentage modulation depth for an AM modulated tone.
  d1 | x
  d2 | x
  d3 | x
  d4 | x
  repeat | x

References dds_phase_rate(), dds_phase_ratef(), dds_scaling_dbm0(), and dds_scaling_dbm0f().

Referenced by adsi_tx_init(), and r2_mf_tx_init().