1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
#ifndef fooa2dpcodechfoo
#define fooa2dpcodechfoo
/***
This file is part of PulseAudio.
Copyright 2018-2019 Pali Rohár <pali.rohar@gmail.com>
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#include <pulsecore/core.h>
#define MAX_A2DP_CAPS_SIZE 254
typedef struct pa_a2dp_codec_capabilities {
uint8_t size;
uint8_t buffer[]; /* max size is 254 bytes */
} pa_a2dp_codec_capabilities;
typedef struct pa_a2dp_codec_id {
uint8_t codec_id;
uint32_t vendor_id;
uint16_t vendor_codec_id;
} pa_a2dp_codec_id;
typedef struct pa_a2dp_codec {
/* Unique name of the codec, lowercase and without whitespaces, used for
* constructing identifier, D-Bus paths, ... */
const char *name;
/* Human readable codec description */
const char *description;
/* A2DP codec id */
pa_a2dp_codec_id id;
/* True if codec is bi-directional and supports backchannel */
bool support_backchannel;
/* Returns true if codec accepts capabilities, for_encoding is true when
* capabilities are used for encoding */
bool (*can_accept_capabilities)(const uint8_t *capabilities_buffer, uint8_t capabilities_size, bool for_encoding);
/* Choose remote endpoint based on capabilities from hash map
* (const char *endpoint -> const pa_a2dp_codec_capabilities *capability)
* and returns corresponding endpoint key (or NULL when there is no valid),
* for_encoder is true when capabilities hash map is used for encoding */
const char *(*choose_remote_endpoint)(const pa_hashmap *capabilities_hashmap, const pa_sample_spec *default_sample_spec, bool for_encoding);
/* Fill codec capabilities, returns size of filled buffer */
uint8_t (*fill_capabilities)(uint8_t capabilities_buffer[MAX_A2DP_CAPS_SIZE]);
/* Validate codec configuration, returns true on success */
bool (*is_configuration_valid)(const uint8_t *config_buffer, uint8_t config_size);
/* Fill preferred codec configuration, returns size of filled buffer or 0 on failure */
uint8_t (*fill_preferred_configuration)(const pa_sample_spec *default_sample_spec, const uint8_t *capabilities_buffer, uint8_t capabilities_size, uint8_t config_buffer[MAX_A2DP_CAPS_SIZE]);
/* Initialize codec, returns codec info data and set sample_spec,
* for_encoding is true when codec_info is used for encoding,
* for_backchannel is true when codec_info is used for backchannel */
void *(*init)(bool for_encoding, bool for_backchannel, const uint8_t *config_buffer, uint8_t config_size, pa_sample_spec *sample_spec);
/* Deinitialize and release codec info data in codec_info */
void (*deinit)(void *codec_info);
/* Reset internal state of codec info data in codec_info */
void (*reset)(void *codec_info);
/* Get read block size for codec */
size_t (*get_read_block_size)(void *codec_info, size_t read_link_mtu);
/* Get write block size for codec */
size_t (*get_write_block_size)(void *codec_info, size_t write_link_mtu);
/* Reduce encoder bitrate for codec, returns new write block size or zero
* if not changed, called when socket is not accepting encoded data fast
* enough */
size_t (*reduce_encoder_bitrate)(void *codec_info, size_t write_link_mtu);
/* Encode input_buffer of input_size to output_buffer of output_size,
* returns size of filled ouput_buffer and set processed to size of
* processed input_buffer */
size_t (*encode_buffer)(void *codec_info, uint32_t timestamp, const uint8_t *input_buffer, size_t input_size, uint8_t *output_buffer, size_t output_size, size_t *processed);
/* Decode input_buffer of input_size to output_buffer of output_size,
* returns size of filled ouput_buffer and set processed to size of
* processed input_buffer */
size_t (*decode_buffer)(void *codec_info, const uint8_t *input_buffer, size_t input_size, uint8_t *output_buffer, size_t output_size, size_t *processed);
} pa_a2dp_codec;
#endif
|
