mirror of
https://github.com/alsa-project/alsa-utils
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ae7346d110
This commit adds support fo alsa-lib PCM API as a backend of 'xfer' module. In a set of alsa-lib PCM API, there're two ways to handle data frames; by calling ioctl(2) with some specific commands with buffer in user space, or copying data frames on mapped page frames. To support both ways, this commit adds an operation structure as abstraction. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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//
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// xfer-libasound.h - a header for receiver/transmitter of frames by alsa-lib.
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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_LIBASOUND__H_
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#define __ALSA_UTILS_AXFER_XFER_LIBASOUND__H_
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#include "xfer.h"
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#define logging(state, ...) \
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snd_output_printf(state->log, __VA_ARGS__)
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struct xfer_libasound_ops;
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struct libasound_state {
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snd_pcm_t *handle;
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snd_output_t *log;
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snd_pcm_hw_params_t *hw_params;
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snd_pcm_sw_params_t *sw_params;
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const struct xfer_libasound_ops *ops;
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void *private_data;
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bool verbose;
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char *node_literal;
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};
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// For internal use in 'libasound' module.
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struct xfer_libasound_ops {
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int (*pre_process)(struct libasound_state *state);
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int (*process_frames)(struct libasound_state *state,
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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 libasound_state *state);
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unsigned int private_size;
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};
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#endif
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