alsa-utils/axfer/mapper.c
Takashi Sakamoto 25c8e3bebb axfer: add support for a mapper for multiple target
This commit adds support of mapper for 'multiple' target. This handles
several files via 'container' functions, and constructs data frame buffer
for playback, or splits data frames from data frame buffer for capture.
When playback source files includes data frames with several channels, the
first channel is used to construct buffer. For capture direction, each of
channel of data frame is stored in one file, thus the file includes one
channel of data frame. When handling non-interleaved buffer, a caller
should use an array of buffer for each of channels with non-interleaved
data frames.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2018-11-13 12:04:28 +01:00

150 lines
3.8 KiB
C

// 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;
}