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Defines | |
#define | _SPANDSP_G711_H_ |
#define | G711_ALAW_IDLE_OCTET 0x5D |
#define | G711_ULAW_IDLE_OCTET 0xFF |
#define | ULAW_BIAS 0x84 |
#define | ALAW_AMI_MASK 0x55 |
Typedefs | |
typedef struct g711_state_s | g711_state_t |
Enumerations | |
enum | { G711_ALAW = 0, G711_ULAW } |
Functions | |
uint8_t | alaw_to_ulaw (uint8_t alaw) |
Transcode from A-law to u-law, using the procedure defined in G.711. | |
uint8_t | ulaw_to_alaw (uint8_t ulaw) |
Transcode from u-law to A-law, using the procedure defined in G.711. | |
int | g711_decode (g711_state_t *s, int16_t amp[], const uint8_t g711_data[], int g711_bytes) |
Decode from u-law or A-law to linear. | |
int | g711_encode (g711_state_t *s, uint8_t g711_data[], const int16_t amp[], int len) |
Encode from linear to u-law or A-law. | |
int | g711_transcode (g711_state_t *s, uint8_t g711_out[], const uint8_t g711_in[], int g711_bytes) |
Transcode between u-law and A-law. | |
g711_state_t * | g711_init (g711_state_t *s, int mode) |
int | g711_release (g711_state_t *s) |
int | g711_free (g711_state_t *s) |
#define ALAW_AMI_MASK 0x55 |
The A-law alternate mark inversion mask
#define G711_ALAW_IDLE_OCTET 0x5D |
Idle value for A-law channels
#define G711_ULAW_IDLE_OCTET 0xFF |
Idle value for u-law channels
#define ULAW_BIAS 0x84 |
Bias for u-law encoding from linear.
typedef struct g711_state_s g711_state_t |
G.711 state
uint8_t alaw_to_ulaw | ( | uint8_t | alaw | ) |
Transcode from A-law to u-law, using the procedure defined in G.711.
alaw | The A-law sample to transcode. |
int g711_decode | ( | g711_state_t * | s, | |
int16_t | amp[], | |||
const uint8_t | g711_data[], | |||
int | g711_bytes | |||
) |
Decode from u-law or A-law to linear.
s | The G.711 context. | |
amp | The linear audio buffer. | |
g711_data | The G.711 data. | |
g711_bytes | The number of G.711 samples to decode. |
int g711_encode | ( | g711_state_t * | s, | |
uint8_t | g711_data[], | |||
const int16_t | amp[], | |||
int | len | |||
) |
Encode from linear to u-law or A-law.
s | The G.711 context. | |
g711_data | The G.711 data. | |
amp | The linear audio buffer. | |
len | The number of samples to encode. |
int g711_free | ( | g711_state_t * | s | ) |
Free a G.711 encode or decode context.
s | The G.711 context. |
g711_state_t* g711_init | ( | g711_state_t * | s, | |
int | mode | |||
) |
Initialise a G.711 encode or decode context.
s | The G.711 context. | |
mode | The G.711 mode. |
int g711_release | ( | g711_state_t * | s | ) |
Release a G.711 encode or decode context.
s | The G.711 context. |
int g711_transcode | ( | g711_state_t * | s, | |
uint8_t | g711_out[], | |||
const uint8_t | g711_in[], | |||
int | g711_bytes | |||
) |
Transcode between u-law and A-law.
s | The G.711 context. | |
g711_out | The resulting G.711 data. | |
g711_in | The original G.711 data. | |
g711_bytes | The number of G.711 samples to transcode. |
uint8_t ulaw_to_alaw | ( | uint8_t | ulaw | ) |
Transcode from u-law to A-law, using the procedure defined in G.711.
ulaw | The u-law sample to transcode. |