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https://github.com/alsa-project/alsa-utils
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58c83ae239
In current aplay, several files can be handled as source of data frames for playback, or destination of captured data frames by an option '--separate-channels' (-I). On the other hand, in ALSA PCM kernel/user interface, several types of buffer are used to communicate between application/hardware; - mapped page frame for data frames with interleaved alignment - mapped page frame for data frames with non-interleaved alignment - buffer in user space for data frames with interleaved alignment - a list of buffer in user space for data frames with non-interleaved alignment This commit adds a common interface, named as 'mapper' to convert frame alignment between these two sides. This interface includes two types; 'muxer' and 'demuxer'. The 'muxer' is for playback direction, to construct playback buffer with PCM frames from several files. The 'demuxer' is for capture direction, to split PCM frames from capture buffer to each of file. Unlike multimedia containers such as MPEG 2/4 Systems, the 'muxer' and 'demuxer' are for playback/capture buffer, not for file contents. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// mapper.c - an interface of muxer/demuxer between buffer with data frames and
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// formatted files.
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//
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// Copyright (c) 2018 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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//
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// Licensed under the terms of the GNU General Public License, version 2.
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#include "mapper.h"
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#include "misc.h"
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#include <stdio.h>
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static const char *const mapper_type_labels[] = {
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[MAPPER_TYPE_MUXER] = "muxer",
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[MAPPER_TYPE_DEMUXER] = "demuxer",
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};
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static const char *const mapper_target_labels[] = {
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[MAPPER_TARGET_COUNT] = "",
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};
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int mapper_context_init(struct mapper_context *mapper,
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enum mapper_type type, unsigned int cntr_count,
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unsigned int verbose)
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{
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const struct mapper_data *data = NULL;
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assert(mapper);
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assert(cntr_count > 0);
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// Detect forgotten to destruct.
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assert(mapper->private_data == NULL);
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memset(mapper, 0, sizeof(*mapper));
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mapper->ops = &data->ops;
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mapper->type = type;
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mapper->private_data = malloc(data->private_size);
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if (mapper->private_data == NULL)
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return -ENOMEM;
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memset(mapper->private_data, 0, data->private_size);
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mapper->cntr_count = cntr_count;
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mapper->verbose = verbose;
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return 0;
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}
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int mapper_context_pre_process(struct mapper_context *mapper,
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snd_pcm_access_t access,
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unsigned int bytes_per_sample,
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unsigned int samples_per_frame,
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unsigned int frames_per_buffer,
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struct container_context *cntrs)
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{
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int err;
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assert(mapper);
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assert(access >= SND_PCM_ACCESS_MMAP_INTERLEAVED);
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assert(access <= SND_PCM_ACCESS_RW_NONINTERLEAVED);
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assert(bytes_per_sample > 0);
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assert(samples_per_frame > 0);
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assert(cntrs);
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mapper->access = access;
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mapper->bytes_per_sample = bytes_per_sample;
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mapper->samples_per_frame = samples_per_frame;
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mapper->frames_per_buffer = frames_per_buffer;
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err = mapper->ops->pre_process(mapper, cntrs, mapper->cntr_count);
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if (err < 0)
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return err;
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if (mapper->verbose > 0) {
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fprintf(stderr, "Mapper: %s\n",
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mapper_type_labels[mapper->type]);
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fprintf(stderr, " target: %s\n",
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mapper_target_labels[mapper->target]);
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fprintf(stderr, " access: %s\n",
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snd_pcm_access_name(mapper->access));
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fprintf(stderr, " bytes/sample: %u\n",
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mapper->bytes_per_sample);
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fprintf(stderr, " samples/frame: %u\n",
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mapper->samples_per_frame);
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fprintf(stderr, " frames/buffer: %lu\n",
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mapper->frames_per_buffer);
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}
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return 0;
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}
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int mapper_context_process_frames(struct mapper_context *mapper,
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void *frame_buffer,
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unsigned int *frame_count,
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struct container_context *cntrs)
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{
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assert(mapper);
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assert(frame_buffer);
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assert(frame_count);
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assert(*frame_count <= mapper->frames_per_buffer);
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assert(cntrs);
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return mapper->ops->process_frames(mapper, frame_buffer, frame_count,
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cntrs, mapper->cntr_count);
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}
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void mapper_context_post_process(struct mapper_context *mapper)
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{
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assert(mapper);
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if (mapper->ops && mapper->ops->post_process)
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mapper->ops->post_process(mapper);
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}
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void mapper_context_destroy(struct mapper_context *mapper)
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{
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assert(mapper);
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if (mapper->private_data)
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free(mapper->private_data);
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mapper->private_data = NULL;
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}
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