alsa-utils/axfer/mapper.c

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// 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;
}