Go to the source code of this file.
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.
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uint8_t | ulaw_to_alaw (uint8_t ulaw) |
| Transcode from u-law to A-law, using the procedure defined in G.711.
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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.
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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.
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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.
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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) |
Detailed Description
Macro Definition Documentation
#define G711_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_BIAS 0x84 |
Bias for u-law encoding from linear.
#define G711_ULAW_IDLE_OCTET 0xFF |
Idle value for u-law channels
Typedef Documentation
Function Documentation
uint8_t alaw_to_ulaw |
( |
uint8_t |
alaw | ) |
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Transcode from A-law to u-law, using the procedure defined in G.711.
- Parameters:
-
alaw | The A-law sample to transcode. |
- Returns:
- The best matching u-law value.
int g711_decode |
( |
g711_state_t * |
s, |
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int16_t |
amp[], |
|
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const uint8_t |
g711_data[], |
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int |
g711_bytes |
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) |
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Decode from u-law or A-law to linear.
- Parameters:
-
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. |
- Returns:
- The number of samples of linear audio produced.
int g711_encode |
( |
g711_state_t * |
s, |
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uint8_t |
g711_data[], |
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const int16_t |
amp[], |
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int |
len |
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) |
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Encode from linear to u-law or A-law.
- Parameters:
-
s | The G.711 context. |
g711_data | The G.711 data. |
amp | The linear audio buffer. |
len | The number of samples to encode. |
- Returns:
- The number of G.711 samples produced.
Free a G.711 encode or decode context.
- Parameters:
-
- Returns:
- 0 for OK.
Initialise a G.711 encode or decode context.
- Parameters:
-
s | The G.711 context. |
mode | The G.711 mode. |
- Returns:
- A pointer to the G.711 context, or NULL for error.
Release a G.711 encode or decode context.
- Parameters:
-
- Returns:
- 0 for OK.
int g711_transcode |
( |
g711_state_t * |
s, |
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uint8_t |
g711_out[], |
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const uint8_t |
g711_in[], |
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int |
g711_bytes |
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) |
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Transcode between u-law and A-law.
- Parameters:
-
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. |
- Returns:
- The number of G.711 samples produced.
uint8_t ulaw_to_alaw |
( |
uint8_t |
ulaw | ) |
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Transcode from u-law to A-law, using the procedure defined in G.711.
- Parameters:
-
ulaw | The u-law sample to transcode. |
- Returns:
- The best matching A-law value.