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spandsp 0.0.6
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Go to the source code of this file.
Classes | |
| struct | plc_state_t |
Macros | |
| #define | PLC_PITCH_MIN 120 |
| #define | PLC_PITCH_MAX 40 |
| #define | PLC_PITCH_OVERLAP_MAX (PLC_PITCH_MIN >> 2) |
| #define | CORRELATION_SPAN 160 |
| #define | PLC_HISTORY_LEN (CORRELATION_SPAN + PLC_PITCH_MIN) |
Functions | |
| int | plc_rx (plc_state_t *s, int16_t amp[], int len) |
| Process a block of received audio samples for PLC. | |
| int | plc_fillin (plc_state_t *s, int16_t amp[], int len) |
| Fill-in a block of missing audio samples. | |
| plc_state_t * | plc_init (plc_state_t *s) |
| Initialise a PLC context. | |
| int | plc_release (plc_state_t *s) |
| int | plc_free (plc_state_t *s) |
| #define CORRELATION_SPAN 160 |
The length over which the AMDF function looks for similarity (20 ms)
| #define PLC_HISTORY_LEN (CORRELATION_SPAN + PLC_PITCH_MIN) |
History buffer length. The buffer much also be at leat 1.25 times PLC_PITCH_MIN, but that is much smaller than the buffer needs to be for the pitch assessment.
| #define PLC_PITCH_MAX 40 |
Maximum allowed pitch (200 Hz)
| #define PLC_PITCH_MIN 120 |
Minimum allowed pitch (66 Hz)
| #define PLC_PITCH_OVERLAP_MAX (PLC_PITCH_MIN >> 2) |
Maximum pitch OLA window
| int plc_fillin | ( | plc_state_t * | s, |
| int16_t | amp[], | ||
| int | len | ||
| ) |
Fill-in a block of missing audio samples.
Fill-in a block of missing audio samples.
| s | The packet loss concealer context. |
| amp | The audio sample buffer. |
| len | The number of samples to be synthesised. |
References CORRELATION_SPAN, plc_state_t::history, plc_state_t::missing_samples, plc_state_t::pitch, plc_state_t::pitch_offset, plc_state_t::pitchbuf, PLC_HISTORY_LEN, PLC_PITCH_MAX, and PLC_PITCH_MIN.
| int plc_free | ( | plc_state_t * | s | ) |
Free a packet loss concealer context.
| s | The packet loss concealer context. |
| plc_state_t * plc_init | ( | plc_state_t * | s | ) |
Initialise a PLC context.
Initialise a packet loss concealer context.
| s | The packet loss concealer context. |
| int plc_release | ( | plc_state_t * | s | ) |
Release a packet loss concealer context.
| s | The packet loss concealer context. |
| int plc_rx | ( | plc_state_t * | s, |
| int16_t | amp[], | ||
| int | len | ||
| ) |
Process a block of received audio samples for PLC.
Process a block of received audio samples for PLC.
| s | The packet loss concealer context. |
| amp | The audio sample buffer. |
| len | The number of samples in the buffer. |
References plc_state_t::missing_samples, plc_state_t::pitch, plc_state_t::pitch_offset, and plc_state_t::pitchbuf.