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
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
|
// SPDX-License-Identifier: GPL-2.0
//
// mapper.c - an interface of muxer/demuxer between buffer with data frames and
// formatted files.
//
// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
//
// Licensed under the terms of the GNU General Public License, version 2.
#include "mapper.h"
#include "misc.h"
#include <stdio.h>
static const char *const mapper_type_labels[] = {
[MAPPER_TYPE_MUXER] = "muxer",
[MAPPER_TYPE_DEMUXER] = "demuxer",
};
static const char *const mapper_target_labels[] = {
[MAPPER_TARGET_SINGLE] = "single",
[MAPPER_TARGET_MULTIPLE] = "multiple",
};
int mapper_context_init(struct mapper_context *mapper,
enum mapper_type type, unsigned int cntr_count,
unsigned int verbose)
{
const struct mapper_data *data = NULL;
assert(mapper);
assert(cntr_count > 0);
// Detect forgotten to destruct.
assert(mapper->private_data == NULL);
memset(mapper, 0, sizeof(*mapper));
if (type == MAPPER_TYPE_MUXER) {
if (cntr_count == 1) {
data = &mapper_muxer_single;
mapper->target = MAPPER_TARGET_SINGLE;
} else {
data = &mapper_muxer_multiple;
mapper->target = MAPPER_TARGET_MULTIPLE;
}
} else {
if (cntr_count == 1) {
data = &mapper_demuxer_single;
mapper->target = MAPPER_TARGET_SINGLE;
} else {
data = &mapper_demuxer_multiple;
mapper->target = MAPPER_TARGET_MULTIPLE;
}
}
mapper->ops = &data->ops;
mapper->type = type;
mapper->private_data = malloc(data->private_size);
if (mapper->private_data == NULL)
return -ENOMEM;
memset(mapper->private_data, 0, data->private_size);
mapper->cntr_count = cntr_count;
mapper->verbose = verbose;
return 0;
}
int mapper_context_pre_process(struct mapper_context *mapper,
snd_pcm_access_t access,
unsigned int bytes_per_sample,
unsigned int samples_per_frame,
unsigned int frames_per_buffer,
struct container_context *cntrs)
{
int err;
assert(mapper);
assert(access >= SND_PCM_ACCESS_MMAP_INTERLEAVED);
assert(access <= SND_PCM_ACCESS_RW_NONINTERLEAVED);
assert(bytes_per_sample > 0);
assert(samples_per_frame > 0);
assert(cntrs);
// The purpose of multiple target is to mux/demux each channels to/from
// containers.
if (mapper->target == MAPPER_TARGET_MULTIPLE &&
samples_per_frame != mapper->cntr_count)
return -EINVAL;
mapper->access = access;
mapper->bytes_per_sample = bytes_per_sample;
mapper->samples_per_frame = samples_per_frame;
mapper->frames_per_buffer = frames_per_buffer;
err = mapper->ops->pre_process(mapper, cntrs, mapper->cntr_count);
if (err < 0)
return err;
if (mapper->verbose > 0) {
fprintf(stderr, "Mapper: %s\n",
mapper_type_labels[mapper->type]);
fprintf(stderr, " target: %s\n",
mapper_target_labels[mapper->target]);
fprintf(stderr, " access: %s\n",
snd_pcm_access_name(mapper->access));
fprintf(stderr, " bytes/sample: %u\n",
mapper->bytes_per_sample);
fprintf(stderr, " samples/frame: %u\n",
mapper->samples_per_frame);
fprintf(stderr, " frames/buffer: %lu\n",
mapper->frames_per_buffer);
}
return 0;
}
int mapper_context_process_frames(struct mapper_context *mapper,
void *frame_buffer,
unsigned int *frame_count,
struct container_context *cntrs)
{
assert(mapper);
assert(frame_buffer);
assert(frame_count);
assert(*frame_count <= mapper->frames_per_buffer);
assert(cntrs);
return mapper->ops->process_frames(mapper, frame_buffer, frame_count,
cntrs, mapper->cntr_count);
}
void mapper_context_post_process(struct mapper_context *mapper)
{
assert(mapper);
if (mapper->ops && mapper->ops->post_process)
mapper->ops->post_process(mapper);
}
void mapper_context_destroy(struct mapper_context *mapper)
{
assert(mapper);
if (mapper->private_data)
free(mapper->private_data);
mapper->private_data = NULL;
}
|
