libmodplug: support options (noise reduction, reverb, bass boost, ...)

libavformat/libmodplug.c

@@ -19,18 +19,48 @@
 /**
 * @file
 * ModPlug demuxer
-* @todo ModPlug options (noise reduction, reverb, bass boost, ...)
 * @todo metadata
 */
 
 #include <libmodplug/modplug.h>
+#include "libavutil/opt.h"
 #include "avformat.h"
 
 typedef struct ModPlugContext {
+    const AVClass *class;
     ModPlugFile *f;
     uint8_t buf[5 * 1<<20]; ///< input file content, 5M max
+
+    /* options */
+    int noise_reduction;
+    int reverb_depth;
+    int reverb_delay;
+    int bass_amount;
+    int bass_range;
+    int surround_depth;
+    int surround_delay;
 } ModPlugContext;
 
+#define OFFSET(x) offsetof(ModPlugContext, x)
+#define D AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+    {"noise_reduction", "Enable noise reduction 0(off)-1(on)",  OFFSET(noise_reduction), FF_OPT_TYPE_INT, {.dbl = 0}, 0,       1, D},
+    {"reverb_depth",    "Reverb level 0(quiet)-100(loud)",      OFFSET(reverb_depth),    FF_OPT_TYPE_INT, {.dbl = 0}, 0,     100, D},
+    {"reverb_delay",    "Reverb delay in ms, usually 40-200ms", OFFSET(reverb_delay),    FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, D},
+    {"bass_amount",     "XBass level 0(quiet)-100(loud)",       OFFSET(bass_amount),     FF_OPT_TYPE_INT, {.dbl = 0}, 0,     100, D},
+    {"bass_range",      "XBass cutoff in Hz 10-100",            OFFSET(bass_range),      FF_OPT_TYPE_INT, {.dbl = 0}, 0,     100, D},
+    {"surround_depth",  "Surround level 0(quiet)-100(heavy)",   OFFSET(surround_depth),  FF_OPT_TYPE_INT, {.dbl = 0}, 0,     100, D},
+    {"surround_delay",  "Surround delay in ms, usually 5-40ms", OFFSET(surround_delay),  FF_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, D},
+    {NULL},
+};
+
+#define SET_OPT_IF_REQUESTED(libopt, opt, flag) do {        \
+    if (modplug->opt) {                                     \
+        settings.libopt  = modplug->opt;                    \
+        settings.mFlags |= flag;                            \
+    }                                                       \
+} while (0)
+
 static int modplug_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {
     AVStream *st;
@@ -46,6 +76,22 @@ static int modplug_read_header(AVFormatContext *s, AVFormatParameters *ap)
     settings.mFrequency      = 44100;
     settings.mResamplingMode = MODPLUG_RESAMPLE_FIR; // best quality
     settings.mLoopCount      = 0; // prevents looping forever
+
+    if (modplug->noise_reduction) settings.mFlags     |= MODPLUG_ENABLE_NOISE_REDUCTION;
+    SET_OPT_IF_REQUESTED(mReverbDepth,   reverb_depth,   MODPLUG_ENABLE_REVERB);
+    SET_OPT_IF_REQUESTED(mReverbDelay,   reverb_delay,   MODPLUG_ENABLE_REVERB);
+    SET_OPT_IF_REQUESTED(mBassAmount,    bass_amount,    MODPLUG_ENABLE_MEGABASS);
+    SET_OPT_IF_REQUESTED(mBassRange,     bass_range,     MODPLUG_ENABLE_MEGABASS);
+    SET_OPT_IF_REQUESTED(mSurroundDepth, surround_depth, MODPLUG_ENABLE_SURROUND);
+    SET_OPT_IF_REQUESTED(mSurroundDelay, surround_delay, MODPLUG_ENABLE_SURROUND);
+
+    if (modplug->reverb_depth)   settings.mReverbDepth   = modplug->reverb_depth;
+    if (modplug->reverb_delay)   settings.mReverbDelay   = modplug->reverb_delay;
+    if (modplug->bass_amount)    settings.mBassAmount    = modplug->bass_amount;
+    if (modplug->bass_range)     settings.mBassRange     = modplug->bass_range;
+    if (modplug->surround_depth) settings.mSurroundDepth = modplug->surround_depth;
+    if (modplug->surround_delay) settings.mSurroundDelay = modplug->surround_delay;
+
     ModPlug_SetSettings(&settings);
 
     modplug->f = ModPlug_Load(modplug->buf, sz);
@@ -93,6 +139,13 @@ static int modplug_read_seek(AVFormatContext *s, int stream_idx, int64_t ts, int
     return 0;
 }
 
+static const AVClass modplug_class = {
+    .class_name = "ModPlug demuxer",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
 AVInputFormat ff_libmodplug_demuxer = {
     .name           = "libmodplug",
     .long_name      = NULL_IF_CONFIG_SMALL("ModPlug demuxer"),
@@ -103,4 +156,5 @@ AVInputFormat ff_libmodplug_demuxer = {
     .read_seek      = modplug_read_seek,
     .extensions     = "669,abc,amf,ams,dbm,dmf,dsm,far,it,mdl,med,mid,mod,mt2,mtm,okt,psm,ptm,s3m,stm,ult,umx,xm"
                       ",itgz,itr,itz,mdgz,mdr,mdz,s3gz,s3r,s3z,xmgz,xmr,xmz", // compressed mods
+    .priv_class     = &modplug_class,
 };