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https://github.com/alsa-project/alsa-utils
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c46d46a436
In alsa-lib PCM API, snd_pcm_read[i|n]() and snd_pcm_write[i|n] can be used with non-blocking mode. This is available when SND_PCM_NONBLOCK is used as 'mode' argument for a call of snd_pcm_open(). This commit adds support this type of operation. To reduce CPU usage, this commit uses 'snd_pcm_wait()' to wait for event notification. Below lines are examples to execute: $ axfer transfer -N -P -d 2 -D hw:0,3 /dev/urandom -f dat -vvv $ axfer transfer -N -C -d 2 -D hw:1,0 /dev/null -r 48000 -vvv Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
52 lines
1.2 KiB
C
52 lines
1.2 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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bool finish_at_xrun:1;
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bool nonblock:1;
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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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extern const struct xfer_libasound_ops xfer_libasound_irq_rw_ops;
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#endif
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