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dsp: add option to swap left and right channels

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Change-Id: Id4b518638436576cfb5e747548f10ece6e58eba0
This commit is contained in:
Christian Soffke 2026-04-16 10:52:16 +02:00 • committed by Solomon Peachy
parent 5ac105c837
commit cc7418dd8b
5 changed files with 44 additions and 3 deletions
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14
apps/lang/english.lang
View file

@ -17085,3 +17085,17 @@
*: "Show in Files"
</voice>
</phrase>
<phrase>
id: LANG_CHANNEL_SWAP
desc: in sound_settings
user: core
<source>
*: "Swap Left & Right"
</source>
<dest>
*: "Swap Left & Right"
</dest>
<voice>
*: "Swap Left & Right"
</voice>
</phrase>

7
apps/settings_list.c
View file

@ -1060,11 +1060,12 @@ const struct settings_list settings[] = {
/* 3-d enhancement effect */
CHOICE_SETTING(0, channel_config, LANG_CHANNEL_CONFIGURATION,
0,"channels",
"stereo,mono,custom,mono left,mono right,karaoke",
sound_set_channels, 6,
"stereo,mono,custom,mono left,mono right,karaoke,swap",
sound_set_channels, 7,
ID2P(LANG_CHANNEL_STEREO), ID2P(LANG_CHANNEL_MONO),
ID2P(LANG_CHANNEL_CUSTOM), ID2P(LANG_CHANNEL_LEFT),
ID2P(LANG_CHANNEL_RIGHT), ID2P(LANG_CHANNEL_KARAOKE)),
ID2P(LANG_CHANNEL_RIGHT), ID2P(LANG_CHANNEL_KARAOKE),
ID2P(LANG_CHANNEL_SWAP)),
SOUND_SETTING(0, stereo_width, LANG_STEREO_WIDTH,
"stereo_width", SOUND_STEREO_WIDTH),
#ifdef AUDIOHW_HAVE_DEPTH_3D

1
firmware/export/audiohw.h
View file

@ -674,6 +674,7 @@ enum AUDIOHW_CHANNEL_CONFIG
SOUND_CHAN_MONO_LEFT,
SOUND_CHAN_MONO_RIGHT,
SOUND_CHAN_KARAOKE,
SOUND_CHAN_SWAP,
SOUND_CHAN_NUM_MODES,
};

22
lib/rbcodec/dsp/channel_mode.c
View file

@ -43,6 +43,8 @@ void channel_mode_proc_custom(struct dsp_proc_entry *this,
struct dsp_buffer **buf_p);
void channel_mode_proc_karaoke(struct dsp_proc_entry *this,
struct dsp_buffer **buf_p);
void channel_mode_proc_swap(struct dsp_proc_entry *this,
struct dsp_buffer **buf_p);
static struct channel_mode_data
{
@ -131,6 +133,25 @@ void channel_mode_proc_karaoke(struct dsp_proc_entry *this,
}
#endif /* CPU */
void channel_mode_proc_swap(struct dsp_proc_entry *this,
struct dsp_buffer **buf_p)
{
struct dsp_buffer *buf = *buf_p;
int32_t *sl = buf->p32[0];
int32_t *sr = buf->p32[1];
int count = buf->remcount;
do
{
int32_t l = *sl;
*sl++ = *sr;
*sr++ = l;
}
while (--count > 0);
(void)this;
}
void channel_mode_proc_mono_left(struct dsp_proc_entry *this,
struct dsp_buffer **buf_p)
{
@ -194,6 +215,7 @@ static void update_process_fn(struct dsp_proc_entry *this)
[SOUND_CHAN_MONO_LEFT] = channel_mode_proc_mono_left,
[SOUND_CHAN_MONO_RIGHT] = channel_mode_proc_mono_right,
[SOUND_CHAN_KARAOKE] = channel_mode_proc_karaoke,
[SOUND_CHAN_SWAP] = channel_mode_proc_swap,
};
this->process = fns[((struct channel_mode_data *)this->data)->mode];

3
manual/configure_rockbox/sound_settings.tex
View file

@ -178,6 +178,9 @@ change to customise your listening experience.
to make the singer sound centrally placed, this often (but not
always) has the effect of removing the voice track from a song. This
setting also very often has other undesirable effects on the sound.
\item[Swap Left \& Right.]
Plays the left channel in the right stereo channel, and the right
channel in the left stereo channel.
\end{description}
\section{Stereo Width}