Add libmodplug support.

1 files changed, 110 insertions, 0 deletions

diff --git a/libavformat/libmodplug.c b/libavformat/libmodplug.c
new file mode 100644
index 0000000000..c10c5002d1
--- /dev/null
+++ b/libavformat/libmodplug.c
@@ -0,0 +1,110 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+* @file
+* ModPlug demuxer
+* @todo ModPlug options (noise reduction, reverb, bass boost, ...)
+* @todo metadata
+*/
+
+#include <libmodplug/modplug.h>
+#include "avformat.h"
+
+typedef struct ModPlugContext {
+    ModPlugFile *f;
+    uint8_t buf[5 * 1<<20]; ///< input file content, 5M max
+} ModPlugContext;
+
+static int modplug_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    AVStream *st;
+    AVIOContext *pb = s->pb;
+    ModPlug_Settings settings;
+    ModPlugContext *modplug = s->priv_data;
+
+    int sz = avio_read(pb, modplug->buf, sizeof modplug->buf);
+
+    ModPlug_GetSettings(&settings);
+    settings.mChannels       = 2;
+    settings.mBits           = 16;
+    settings.mFrequency      = 44100;
+    settings.mResamplingMode = MODPLUG_RESAMPLE_FIR; // best quality
+    settings.mLoopCount      = 0; // prevents looping forever
+    ModPlug_SetSettings(&settings);
+
+    modplug->f = ModPlug_Load(modplug->buf, sz);
+    if (!modplug->f)
+        return AVERROR_INVALIDDATA;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+    av_set_pts_info(st, 64, 1, 1000);
+    st->duration = ModPlug_GetLength(modplug->f);
+    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codec->codec_id    = CODEC_ID_PCM_S16LE;
+    st->codec->channels    = settings.mChannels;
+    st->codec->sample_rate = settings.mFrequency;
+    return 0;
+}
+
+static int modplug_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    int ret, n;
+    ModPlugContext *modplug = s->priv_data;
+    uint8_t buf[512];
+
+    n = ModPlug_Read(modplug->f, buf, sizeof buf);
+    if (n <= 0)
+        return AVERROR(EIO);
+
+    ret = av_new_packet(pkt, n);
+    if (ret)
+        return ret;
+    pkt->pts  = pkt->dts = AV_NOPTS_VALUE;
+    pkt->size = n;
+    memcpy(pkt->data, buf, n);
+    return 0;
+}
+
+static int modplug_read_close(AVFormatContext *s)
+{
+    ModPlugContext *modplug = s->priv_data;
+    ModPlug_Unload(modplug->f);
+    return 0;
+}
+
+static int modplug_read_seek(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
+{
+    const ModPlugContext *modplug = s->priv_data;
+    ModPlug_Seek(modplug->f, (int)ts);
+    return 0;
+}
+
+AVInputFormat ff_libmodplug_demuxer = {
+    .name           = "libmodplug",
+    .long_name      = NULL_IF_CONFIG_SMALL("ModPlug demuxer"),
+    .priv_data_size = sizeof(ModPlugContext),
+    .read_header    = modplug_read_header,
+    .read_packet    = modplug_read_packet,
+    .read_close     = modplug_read_close,
+    .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
+};