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// SPDX-License-Identifier: GPL-2.0
//
// mapper-single.c - a muxer/demuxer for single containers.
//
// 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"
struct single_state {
void (*align_frames)(void *frame_buf, unsigned int frame_count,
char *buf, unsigned int bytes_per_sample,
unsigned int samples_per_frame);
char *buf;
};
static void align_to_vector(void *frame_buf, unsigned int frame_count,
char *src, unsigned int bytes_per_sample,
unsigned samples_per_frame)
{
char **dst_bufs = frame_buf;
char *dst;
unsigned int src_pos;
unsigned int dst_pos;
int i, j;
// src: interleaved => dst: a set of interleaved buffers.
for (i = 0; i < samples_per_frame; ++i) {
dst = dst_bufs[i];
for (j = 0; j < frame_count; ++j) {
src_pos = bytes_per_sample * (samples_per_frame * j + i);
dst_pos = bytes_per_sample * j;
memcpy(dst + dst_pos, src + src_pos, bytes_per_sample);
}
}
}
static void align_from_vector(void *frame_buf, unsigned int frame_count,
char *dst, unsigned int bytes_per_sample,
unsigned int samples_per_frame)
{
char **src_bufs = frame_buf;
char *src;
unsigned int dst_pos;
unsigned int src_pos;
int i, j;
// src: a set of interleaved buffers => dst:interleaved.
for (i = 0; i < samples_per_frame; ++i) {
src = src_bufs[i];
for (j = 0; j < frame_count; ++j) {
src_pos = bytes_per_sample * j;
dst_pos = bytes_per_sample * (samples_per_frame * j + i);
memcpy(dst + dst_pos, src + src_pos, bytes_per_sample);
}
}
}
static int single_pre_process(struct mapper_context *mapper,
struct container_context *cntrs,
unsigned int cntr_count)
{
struct single_state *state = mapper->private_data;
unsigned int bytes_per_buffer;
if (cntrs->bytes_per_sample != mapper->bytes_per_sample ||
cntrs->samples_per_frame != mapper->samples_per_frame)
return -EINVAL;
// Decide method to align frames.
if (mapper->type == MAPPER_TYPE_DEMUXER) {
if (mapper->access == SND_PCM_ACCESS_RW_NONINTERLEAVED ||
mapper->access == SND_PCM_ACCESS_MMAP_NONINTERLEAVED)
state->align_frames = align_from_vector;
else if (mapper->access == SND_PCM_ACCESS_RW_INTERLEAVED ||
mapper->access == SND_PCM_ACCESS_MMAP_INTERLEAVED)
state->align_frames = NULL;
else
return -EINVAL;
} else {
if (mapper->access == SND_PCM_ACCESS_RW_NONINTERLEAVED ||
mapper->access == SND_PCM_ACCESS_MMAP_NONINTERLEAVED)
state->align_frames = align_to_vector;
else if (mapper->access == SND_PCM_ACCESS_RW_INTERLEAVED ||
mapper->access == SND_PCM_ACCESS_MMAP_INTERLEAVED)
state->align_frames = NULL;
else
return -EINVAL;
}
if (state->align_frames) {
// Allocate intermediate buffer as the same size as a period.
bytes_per_buffer = mapper->bytes_per_sample *
mapper->samples_per_frame *
mapper->frames_per_buffer;
state->buf = malloc(bytes_per_buffer);
if (state->buf == NULL)
return -ENOMEM;
memset(state->buf, 0, bytes_per_buffer);
}
return 0;
}
static int single_muxer_process_frames(struct mapper_context *mapper,
void *frame_buf,
unsigned int *frame_count,
struct container_context *cntrs,
unsigned int cntr_count)
{
struct single_state *state = mapper->private_data;
void *src;
int err;
// If need to align PCM frames, process PCM frames to the intermediate
// buffer once.
if (!state->align_frames) {
// The most likely.
src = frame_buf;
} else {
src = state->buf;
}
err = container_context_process_frames(cntrs, src, frame_count);
if (err < 0)
return err;
// Unlikely.
if (src != frame_buf && *frame_count > 0)
state->align_frames(frame_buf, *frame_count, src,
mapper->bytes_per_sample,
mapper->samples_per_frame);
return 0;
}
static int single_demuxer_process_frames(struct mapper_context *mapper,
void *frame_buf,
unsigned int *frame_count,
struct container_context *cntrs,
unsigned int cntr_count)
{
struct single_state *state = mapper->private_data;
void *dst;
// If need to align PCM frames, process PCM frames to the intermediate
// buffer once.
if (!state->align_frames) {
// The most likely.
dst = frame_buf;
} else {
state->align_frames(frame_buf, *frame_count, state->buf,
mapper->bytes_per_sample,
mapper->samples_per_frame);
dst = state->buf;
}
return container_context_process_frames(cntrs, dst, frame_count);
}
static void single_post_process(struct mapper_context *mapper)
{
struct single_state *state = mapper->private_data;
if (state->buf)
free(state->buf);
state->buf = NULL;
state->align_frames = NULL;
}
const struct mapper_data mapper_muxer_single = {
.ops = {
.pre_process = single_pre_process,
.process_frames = single_muxer_process_frames,
.post_process = single_post_process,
},
.private_size = sizeof(struct single_state),
};
const struct mapper_data mapper_demuxer_single = {
.ops = {
.pre_process = single_pre_process,
.process_frames = single_demuxer_process_frames,
.post_process = single_post_process,
},
.private_size = sizeof(struct single_state),
};
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