The command line parameter remains linear.
Signed-off-by: Marton Balint <c...@passwd.hu>
---
ffplay.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/ffplay.c b/ffplay.c
index 1c9db73..cf138dc 100644
--- a/ffplay.c
+++ b/ffplay.c
@@ -73,8 +73,8 @@ const int program_birth_year = 2003;
/* Calculate actual buffer size keeping in mind not cause too frequent audio
callbacks */
#define SDL_AUDIO_MAX_CALLBACKS_PER_SEC 30
-/* Step size for volume control */
-#define SDL_VOLUME_STEP (SDL_MIX_MAXVOLUME / 50)
+/* Step size for volume control in dB */
+#define SDL_VOLUME_STEP (0.75)
/* no AV sync correction is done if below the minimum AV sync threshold */
#define AV_SYNC_THRESHOLD_MIN 0.04
@@ -1450,9 +1450,11 @@ static void toggle_mute(VideoState *is)
is->muted = !is->muted;
}
-static void update_volume(VideoState *is, int sign, int step)
+static void update_volume(VideoState *is, int sign, double step)
{
- is->audio_volume = av_clip(is->audio_volume + sign * step, 0,
SDL_MIX_MAXVOLUME);
+ double volume_level = is->audio_volume ? (20 * log(is->audio_volume /
(double)SDL_MIX_MAXVOLUME) / log(10)) : -1000.0;
+ int new_volume = lrint(SDL_MIX_MAXVOLUME * pow(10.0, (volume_level + sign
* step) / 20.0));
+ is->audio_volume = av_clip(is->audio_volume == new_volume ?
(is->audio_volume + sign) : new_volume, 0, SDL_MIX_MAXVOLUME);
}
static void step_to_next_frame(VideoState *is)
--
2.10.2
_______________________________________________
ffmpeg-devel mailing list
ffmpeg-devel@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
