mirror of
https://github.com/alsa-project/alsa-utils
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ae378611b7
In ALSA PCM interface, before configuring hardware actually, applications can request available set of hardware parameters for runtime of PCM substream. The set of parameters are represented and delivered by a structure. In alsa-lib PCM API, the above design is abstracted by a series of snd_pcm_hw_params_xxx() functions. An actual layout of the structure is hidden from applications by an opaque pointer. In aplay, '--dump-hw-params' option is for this purpose. With this option, the command output available set of the hardware parameters. This commit adds support for the option. Unlike aplay, this commit takes this program to finish after dumping the parameters for simplicity of usage. I note that all of combinations in the set are not necessarily available when the PCM substream includes dependencies of parameters described by constraints and rules. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// xfer.h - a header for receiver/transmiter of data frames.
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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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#ifndef __ALSA_UTILS_AXFER_XFER__H_
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#define __ALSA_UTILS_AXFER_XFER__H_
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#include "mapper.h"
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#include <getopt.h>
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enum xfer_type {
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XFER_TYPE_UNSUPPORTED = -1,
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XFER_TYPE_LIBASOUND = 0,
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XFER_TYPE_COUNT,
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};
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struct xfer_ops;
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struct xfer_context {
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snd_pcm_stream_t direction;
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enum xfer_type type;
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const struct xfer_ops *ops;
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void *private_data;
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char *sample_format_literal;
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char *cntr_format_literal;
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unsigned int verbose;
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unsigned int frames_per_second;
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unsigned int samples_per_frame;
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bool help:1;
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bool quiet:1;
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bool dump_hw_params:1;
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bool multiple_cntrs:1; // For mapper.
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snd_pcm_format_t sample_format;
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// For containers.
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char **paths;
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unsigned int path_count;
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enum container_format cntr_format;
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};
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enum xfer_type xfer_type_from_label(const char *label);
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int xfer_context_init(struct xfer_context *xfer, enum xfer_type type,
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snd_pcm_stream_t direction, int argc, char *const *argv);
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void xfer_context_destroy(struct xfer_context *xfer);
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int xfer_context_pre_process(struct xfer_context *xfer,
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snd_pcm_format_t *format,
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unsigned int *samples_per_frame,
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unsigned int *frames_per_second,
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snd_pcm_access_t *access,
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snd_pcm_uframes_t *frames_per_buffer);
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int xfer_context_process_frames(struct xfer_context *xfer,
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struct mapper_context *mapper,
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struct container_context *cntrs,
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unsigned int *frame_count);
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void xfer_context_pause(struct xfer_context *xfer, bool enable);
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void xfer_context_post_process(struct xfer_context *xfer);
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struct xfer_data;
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int xfer_options_parse_args(struct xfer_context *xfer,
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const struct xfer_data *data, int argc,
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char *const *argv);
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int xfer_options_fixup_paths(struct xfer_context *xfer);
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// For internal use in 'xfer' module.
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struct xfer_ops {
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int (*init)(struct xfer_context *xfer, snd_pcm_stream_t direction);
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int (*parse_opt)(struct xfer_context *xfer, int key, const char *optarg);
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int (*validate_opts)(struct xfer_context *xfer);
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int (*pre_process)(struct xfer_context *xfer, snd_pcm_format_t *format,
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unsigned int *samples_per_frame,
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unsigned int *frames_per_second,
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snd_pcm_access_t *access,
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snd_pcm_uframes_t *frames_per_buffer);
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int (*process_frames)(struct xfer_context *xfer,
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unsigned int *frame_count,
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struct mapper_context *mapper,
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struct container_context *cntrs);
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void (*post_process)(struct xfer_context *xfer);
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void (*destroy)(struct xfer_context *xfer);
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void (*pause)(struct xfer_context *xfer, bool enable);
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};
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struct xfer_data {
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const char *s_opts;
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const struct option *l_opts;
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unsigned int l_opts_count;
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struct xfer_ops ops;
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unsigned int private_size;
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};
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extern const struct xfer_data xfer_libasound;
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#endif
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