aboutsummaryrefslogtreecommitdiffstats
path: root/src/normalize.c
diff options
context:
space:
mode:
authorJ. Alexander Treuman <jat@spatialrift.net>2006-07-27 00:50:59 +0000
committerJ. Alexander Treuman <jat@spatialrift.net>2006-07-27 00:50:59 +0000
commit22b16884a2fb054ed219f07774cc16ec3af34c26 (patch)
tree605a3313d64b7a048c9cab56b2db210eaf7d40a5 /src/normalize.c
parentbf5336cebd9e31e0eb0664ef62ce5c6751aa31a3 (diff)
downloadmpd-22b16884a2fb054ed219f07774cc16ec3af34c26.tar.gz
mpd-22b16884a2fb054ed219f07774cc16ec3af34c26.tar.xz
mpd-22b16884a2fb054ed219f07774cc16ec3af34c26.zip
Use AudioCompress for volume normalization
git-svn-id: https://svn.musicpd.org/mpd/trunk@4474 09075e82-0dd4-0310-85a5-a0d7c8717e4f
Diffstat (limited to 'src/normalize.c')
-rw-r--r--src/normalize.c89
1 files changed, 18 insertions, 71 deletions
diff --git a/src/normalize.c b/src/normalize.c
index 8c48f13bd..31394cbfb 100644
--- a/src/normalize.c
+++ b/src/normalize.c
@@ -16,85 +16,32 @@
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
-#include <math.h>
-#include <limits.h>
-
+#include "compress.h"
#include "conf.h"
#include "normalize.h"
-#include "playlist.h"
-
-/* silence level, apparently this is Wrong (tm) */
-#define SILENCE_LEVEL (SHRT_MAX * 0.01)
-/* not sure what this is :) */
-#define MID (SHRT_MAX * 0.25)
-#define MUL_MIN 0.1
-#define MUL_MAX 5.0
-#define NSAMPLES 128
-#define MIN_SAMPLE_SIZE 32000
+#include <stdlib.h>
-#define clamp(a,min,max) (((a)>(max))?(max):(((a)<(min))?(min):(a)))
+int normalizationEnabled;
-void normalizeData(char *buffer, int bufferSize, AudioFormat *format)
+void initNormalization()
{
- static float multiplier = 1.0;
- static int current_id = 0;
- float average = 0.0;
- static int old_song = 0;
- int new_song = 0;
- int total_length = 0;
- int temp = 0;
- int i = 0;
- float root_mean_square = 0.0; /* the rms of the data */
- mpd_sint16 *data = (mpd_sint16 *) buffer; /* the audio data */
- int length = bufferSize / 2; /* the number of samples */
- static struct {
- float avg; /* average sample 'level' */
- int len; /* sample size (used to weigh sample) */
- } mem[NSAMPLES];
-
- /* operate only on 16 bit, 2 channel audio */
- if (format->bits != 16 && format->channels != 2) return;
-
- /* calculate the root mean square of the data */
- for (i = 0; i < length; i++)
- root_mean_square += (float)(data[i] * data[i]);
-
- root_mean_square = sqrt(root_mean_square / (float)length);
+ normalizationEnabled = getBoolConfigParam(CONF_VOLUME_NORMALIZATION);
+ if (normalizationEnabled == -1) normalizationEnabled = 0;
+ else if (normalizationEnabled < 0) exit(EXIT_FAILURE);
- /* reset the multiplier if the song has changed */
- if (old_song != (new_song = getPlaylistCurrentSong())) {
- old_song = new_song;
- /* re-zero 'mem' */
- for (i = 0; i < NSAMPLES; i++) {
- mem[i].avg = 0.0;
- mem[i].len = 0;
- }
- current_id = 0;
- }
-
- /* and now do magic tricks */
- for (i = 0; i < NSAMPLES; i++) {
- average += mem[i].avg * (float)mem[i].len;
- total_length += mem[i].len;
- }
+ if (normalizationEnabled)
+ CompressCfg(0, ANTICLIP, TARGET, GAINMAX, GAINSMOOTH, BUCKETS);
+}
- if (total_length > MIN_SAMPLE_SIZE) {
- average /= (float) total_length;
- if (average >= SILENCE_LEVEL) {
- multiplier = MID / average;
- /* clamp multiplier */
- multiplier = clamp(multiplier, MUL_MIN, MUL_MAX);
- }
- }
+void finishNormalization()
+{
+ if (normalizationEnabled) CompressFree();
+}
- /* scale and clamp the samples */
- for (i = 0; i < length; i++) {
- temp = data[i] * multiplier;
- data[i] = clamp(temp, SHRT_MIN, SHRT_MAX);
- }
+void normalizeData(char *buffer, int bufferSize, AudioFormat *format)
+{
+ if ((format->bits != 16) || (format->channels != 2)) return;
- mem[current_id].len = bufferSize / 2;
- mem[current_id].avg = multiplier * root_mean_square;
- current_id = (current_id + 1) % NSAMPLES; /* increment current_id */
+ CompressDo(buffer, bufferSize);
}