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axfer: add support for a mapper for multiple target
[android-x86/external-alsa-utils.git] / axfer / mapper.h
1 // SPDX-License-Identifier: GPL-2.0
2 //
3 // mapper.h - an interface of muxer/demuxer between buffer with data frames and
4 //            formatted files.
5 //
6 // Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
7 //
8 // Licensed under the terms of the GNU General Public License, version 2.
9
10 #ifndef __ALSA_UTILS_AXFER_MAPPER__H_
11 #define __ALSA_UTILS_AXFER_MAPPER__H_
12
13 #include "container.h"
14
15 enum mapper_type {
16         MAPPER_TYPE_MUXER = 0,
17         MAPPER_TYPE_DEMUXER,
18         MAPPER_TYPE_COUNT,
19 };
20
21 enum mapper_target {
22         MAPPER_TARGET_SINGLE = 0,
23         MAPPER_TARGET_MULTIPLE,
24         MAPPER_TARGET_COUNT,
25 };
26
27 struct mapper_ops;
28
29 struct mapper_context {
30         enum mapper_type type;
31         enum mapper_target target;
32         const struct mapper_ops *ops;
33         unsigned int private_size;
34
35         void *private_data;
36         unsigned int cntr_count;
37
38         // A part of parameters of PCM substream.
39         snd_pcm_access_t access;
40         unsigned int bytes_per_sample;
41         unsigned int samples_per_frame;
42         snd_pcm_uframes_t frames_per_buffer;
43
44         unsigned int verbose;
45 };
46
47 int mapper_context_init(struct mapper_context *mapper,
48                         enum mapper_type type, unsigned int cntr_count,
49                         unsigned int verbose);
50 int mapper_context_pre_process(struct mapper_context *mapper,
51                                snd_pcm_access_t access,
52                                unsigned int bytes_per_sample,
53                                unsigned int samples_per_frame,
54                                unsigned int frames_per_buffer,
55                                struct container_context *cntrs);
56 int mapper_context_process_frames(struct mapper_context *mapper,
57                                   void *frame_buffer,
58                                   unsigned int *frame_count,
59                                   struct container_context *cntrs);
60 void mapper_context_post_process(struct mapper_context *mapper);
61 void mapper_context_destroy(struct mapper_context *mapper);
62
63 // For internal use in 'mapper' module.
64
65 struct mapper_ops {
66         int (*pre_process)(struct mapper_context *mapper,
67                            struct container_context *cntrs,
68                            unsigned int cntr_count);
69         int (*process_frames)(struct mapper_context *mapper,
70                               void *frame_buffer, unsigned int *frame_count,
71                               struct container_context *cntrs,
72                               unsigned int cntr_count);
73         void (*post_process)(struct mapper_context *mapper);
74 };
75
76 struct mapper_data {
77         struct mapper_ops ops;
78         unsigned int private_size;
79 };
80
81 extern const struct mapper_data mapper_muxer_single;
82 extern const struct mapper_data mapper_demuxer_single;
83
84 extern const struct mapper_data mapper_muxer_multiple;
85 extern const struct mapper_data mapper_demuxer_multiple;
86
87 #endif