74 lines
2.2 KiB
C
74 lines
2.2 KiB
C
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/*
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* cx18 audio-related functions
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*
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* Derived from ivtv-audio.c
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*
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* Copyright (C) 2007 Hans Verkuil <hverkuil@xs4all.nl>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License 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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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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* 02111-1307 USA
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*/
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#include "cx18-driver.h"
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#include "cx18-i2c.h"
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#include "cx18-cards.h"
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#include "cx18-audio.h"
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/* Selects the audio input and output according to the current
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settings. */
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int cx18_audio_set_io(struct cx18 *cx)
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{
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struct v4l2_routing route;
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u32 audio_input;
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int mux_input;
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/* Determine which input to use */
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if (test_bit(CX18_F_I_RADIO_USER, &cx->i_flags)) {
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audio_input = cx->card->radio_input.audio_input;
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mux_input = cx->card->radio_input.muxer_input;
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} else {
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audio_input =
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cx->card->audio_inputs[cx->audio_input].audio_input;
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mux_input =
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cx->card->audio_inputs[cx->audio_input].muxer_input;
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}
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/* handle muxer chips */
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route.input = mux_input;
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route.output = 0;
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cx18_i2c_hw(cx, cx->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
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route.input = audio_input;
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return cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
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VIDIOC_INT_S_AUDIO_ROUTING, &route);
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}
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void cx18_audio_set_route(struct cx18 *cx, struct v4l2_routing *route)
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{
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cx18_i2c_hw(cx, cx->card->hw_audio_ctrl,
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VIDIOC_INT_S_AUDIO_ROUTING, route);
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}
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void cx18_audio_set_audio_clock_freq(struct cx18 *cx, u8 freq)
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{
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static u32 freqs[3] = { 44100, 48000, 32000 };
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/* The audio clock of the digitizer must match the codec sample
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rate otherwise you get some very strange effects. */
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if (freq > 2)
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return;
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cx18_call_i2c_clients(cx, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);
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}
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