2012-07-27 13:50:03 +02:00
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/*
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* Copyright (C) 2012 Mark Hills <mark@xwax.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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*/
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2009-09-05 00:04:44 +02:00
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#include <stdio.h>
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#include <alsa/asoundlib.h>
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#define CHK(call, r) { \
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if (r < 0) { \
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aerror(call, r); \
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return -1; \
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} \
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}
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void aerror(const char *msg, int r)
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{
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fputs(msg, stderr);
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fputs(": ", stderr);
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fputs(snd_strerror(r), stderr);
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fputc('\n', stderr);
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}
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int set_alsa_hw(snd_pcm_t *pcm,
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unsigned int rate, unsigned int channels,
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unsigned int buffer)
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{
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int r, dir;
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snd_pcm_hw_params_t *hw;
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snd_pcm_hw_params_alloca(&hw);
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r = snd_pcm_hw_params_any(pcm, hw);
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CHK("snd_pcm_hw_params_any", r);
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r = snd_pcm_hw_params_set_rate_resample(pcm, hw, 1);
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CHK("snd_pcm_hw_params_set_rate_resample", r);
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r = snd_pcm_hw_params_set_access(pcm, hw, SND_PCM_ACCESS_RW_INTERLEAVED);
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CHK("snd_pcm_hw_params_set_access", r);
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r = snd_pcm_hw_params_set_format(pcm, hw, SND_PCM_FORMAT_FLOAT);
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CHK("snd_pcm_hw_params_set_format", r);
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r = snd_pcm_hw_params_set_rate(pcm, hw, rate, 0);
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CHK("snd_pcm_hw_params_set_rate", r);
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r = snd_pcm_hw_params_set_channels(pcm, hw, channels);
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CHK("snd_pcm_hw_params_set_channels", r);
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2014-03-21 19:43:05 +01:00
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dir = -1;
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r = snd_pcm_hw_params_set_buffer_time_near(pcm, hw, &buffer, &dir);
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CHK("snd_pcm_hw_params_set_buffer_time_near", r);
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2009-09-05 00:04:44 +02:00
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r = snd_pcm_hw_params(pcm, hw);
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CHK("hw_params", r);
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return 0;
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}
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int set_alsa_sw(snd_pcm_t *pcm)
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{
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int r;
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snd_pcm_sw_params_t *sw;
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snd_pcm_uframes_t boundary;
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snd_pcm_sw_params_alloca(&sw);
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r = snd_pcm_sw_params_current(pcm, sw);
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CHK("snd_pcm_sw_params_current", r);
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r = snd_pcm_sw_params_get_boundary(sw, &boundary);
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CHK("snd_pcm_sw_params_get_boundary", r);
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r = snd_pcm_sw_params_set_stop_threshold(pcm, sw, boundary);
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CHK("snd_pcm_sw_params_set_stop_threshold", r);
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r = snd_pcm_sw_params(pcm, sw);
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CHK("snd_pcm_sw_params", r);
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return 0;
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}
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