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Audio-related ivtv functions.
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at>
Copyright (C) 2005-2007 Hans Verkuil <>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#include "ivtv-driver.h"
#include "ivtv-mailbox.h"
#include "ivtv-i2c.h"
#include "ivtv-gpio.h"
#include "ivtv-cards.h"
#include "ivtv-audio.h"
#include <media/msp3400.h>
#include <linux/videodev.h>
/* Selects the audio input and output according to the current
settings. */
int ivtv_audio_set_io(struct ivtv *itv)
struct v4l2_routing route;
u32 audio_input;
int mux_input;
/* Determine which input to use */
if (test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
audio_input = itv->card->radio_input.audio_input;
mux_input = itv->card->radio_input.muxer_input;
} else {
audio_input = itv->card->audio_inputs[itv->audio_input].audio_input;
mux_input = itv->card->audio_inputs[itv->audio_input].muxer_input;
/* handle muxer chips */
route.input = mux_input;
route.output = 0;
ivtv_i2c_hw(itv, itv->card->hw_muxer, VIDIOC_INT_S_AUDIO_ROUTING, &route);
route.input = audio_input;
if (itv->card->hw_audio & IVTV_HW_MSP34XX) {
route.output = MSP_OUTPUT(MSP_SC_IN_DSP_SCART1);
return ivtv_i2c_hw(itv, itv->card->hw_audio, VIDIOC_INT_S_AUDIO_ROUTING, &route);
void ivtv_audio_set_route(struct ivtv *itv, struct v4l2_routing *route)
ivtv_i2c_hw(itv, itv->card->hw_audio, VIDIOC_INT_S_AUDIO_ROUTING, route);
void ivtv_audio_set_audio_clock_freq(struct ivtv *itv, u8 freq)
static u32 freqs[3] = { 44100, 48000, 32000 };
/* The audio clock of the digitizer must match the codec sample
rate otherwise you get some very strange effects. */
if (freq > 2)
ivtv_call_i2c_clients(itv, VIDIOC_INT_AUDIO_CLOCK_FREQ, &freqs[freq]);