[FFmpeg-devel] [PATCH] lavf: add libopenmpt demuxer

Josh de Kock josh at itanimul.li
Sun Jun 12 03:43:10 CEST 2016


---
 configure                |   4 +
 libavformat/Makefile     |   1 +
 libavformat/allformats.c |   1 +
 libavformat/libopenmpt.c | 185 +++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 191 insertions(+)
 create mode 100644 libavformat/libopenmpt.c

diff --git a/configure b/configure
index 7c463a5..a74aaab 100755
--- a/configure
+++ b/configure
@@ -248,6 +248,7 @@ External library support:
   --enable-libopencv       enable video filtering via libopencv [no]
   --enable-libopenh264     enable H.264 encoding via OpenH264 [no]
   --enable-libopenjpeg     enable JPEG 2000 de/encoding via OpenJPEG [no]
+  --enable-libopenmpt      enable decoding tracked mod files via libopenmpt [no]
   --enable-libopus         enable Opus de/encoding via libopus [no]
   --enable-libpulse        enable Pulseaudio input via libpulse [no]
   --enable-librubberband   enable rubberband needed for rubberband filter [no]
@@ -1495,6 +1496,7 @@ EXTERNAL_LIBRARY_LIST="
     libopencv
     libopenh264
     libopenjpeg
+    libopenmpt
     libopus
     libpulse
     librtmp
@@ -2741,6 +2743,7 @@ libopencore_amrwb_decoder_deps="libopencore_amrwb"
 libopenh264_encoder_deps="libopenh264"
 libopenjpeg_decoder_deps="libopenjpeg"
 libopenjpeg_encoder_deps="libopenjpeg"
+libopenmpt_demuxer_deps="libopenmpt"
 libopus_decoder_deps="libopus"
 libopus_encoder_deps="libopus"
 libopus_encoder_select="audio_frame_queue"
@@ -5633,6 +5636,7 @@ enabled libopenjpeg       && { check_lib openjpeg-2.1/openjpeg.h opj_version -lo
                                check_lib openjpeg-1.5/openjpeg.h opj_version -lopenjpeg -DOPJ_STATIC ||
                                check_lib openjpeg.h opj_version -lopenjpeg -DOPJ_STATIC ||
                                die "ERROR: libopenjpeg not found"; }
+enabled libopenmpt        && require libopenmpt libopenmpt/libopenmpt.h openmpt_module_create -lopenmpt -lstdc++
 enabled libopus           && require_pkg_config opus opus_multistream.h opus_multistream_decoder_create
 enabled libpulse          && require_pkg_config libpulse pulse/pulseaudio.h pa_context_new
 enabled librtmp           && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket
diff --git a/libavformat/Makefile b/libavformat/Makefile
index 6684ead..233d4e0 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -521,6 +521,7 @@ OBJS-$(CONFIG_LIBGME_DEMUXER)            += libgme.o
 OBJS-$(CONFIG_LIBMODPLUG_DEMUXER)        += libmodplug.o
 OBJS-$(CONFIG_LIBNUT_DEMUXER)            += libnut.o
 OBJS-$(CONFIG_LIBNUT_MUXER)              += libnut.o
+OBJS-$(CONFIG_LIBOPENMPT_DEMUXER)        += libopenmpt.o
 OBJS-$(CONFIG_LIBRTMP)                   += librtmp.o
 OBJS-$(CONFIG_LIBSSH_PROTOCOL)           += libssh.o
 OBJS-$(CONFIG_LIBSMBCLIENT_PROTOCOL)     += libsmbclient.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index ddf540c..de445b0 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -370,6 +370,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (LIBGME,           libgme);
     REGISTER_DEMUXER (LIBMODPLUG,       libmodplug);
     REGISTER_MUXDEMUX(LIBNUT,           libnut);
+    REGISTER_DEMUXER (LIBOPENMPT,       libopenmpt);
 
     initialized = 1;
 }
diff --git a/libavformat/libopenmpt.c b/libavformat/libopenmpt.c
new file mode 100644
index 0000000..8c95c0a
--- /dev/null
+++ b/libavformat/libopenmpt.c
@@ -0,0 +1,185 @@
+/*
+ * Tracked MOD demuxer (libopenmpt)
+ * Copyright (c) 2016 Josh de Kock
+ *
+ * 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
+* libopenmpt demuxer
+*/
+
+#include <libopenmpt/libopenmpt.h>
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
+#include "libavutil/opt.h"
+#include "avformat.h"
+#include "internal.h"
+
+typedef struct OpenMPTContext {
+    const AVClass *class;
+    openmpt_module *module;
+
+    int channels;
+    double length;
+    /* options */
+    int sample_rate;
+} OpenMPTContext;
+
+#define OFFSET(x) offsetof(OpenMPTContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM
+#define D AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+    {"sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 1000, 999999, A|D},
+    {NULL}
+};
+
+static int probe_openmpt(AVProbeData *p)
+{
+    if (p->buf_size < 1084)
+        return 0;
+
+    if (p->buf[1080] == 'M' && p->buf[1081] == '.' &&
+        p->buf[1082] == 'K' && p->buf[1083] == '.')
+        return AVPROBE_SCORE_MAX;
+
+    return 0;
+}
+
+static void openmpt_logfunc(const char *message, void *userdata)
+{
+    av_log((AVFormatContext*)userdata, AV_LOG_INFO, "%s\n", message);
+}
+
+#define add_meta(s, name, value)                  \
+    if (value && value[0])                        \
+       av_dict_set(&s->metadata, name, value, 0); \
+
+static int read_header_openmpt(AVFormatContext *s)
+{
+    AVStream *st;
+    OpenMPTContext *openmpt = s->priv_data;
+    int64_t size = avio_size(s->pb);
+    char *buf = av_malloc(size);
+
+    if (!buf)
+        return AVERROR(ENOMEM);
+    size = avio_read(s->pb, buf, size);
+
+    if (!(openmpt->module = openmpt_module_create_from_memory(buf, size, openmpt_logfunc, s, NULL))) {
+        av_free(buf);
+        return AVERROR_INVALIDDATA;
+    }
+    av_free(buf);
+
+    openmpt->channels = openmpt_module_get_num_channels(openmpt->module);
+    openmpt->length   = openmpt_module_get_duration_seconds(openmpt->module);
+
+    add_meta(s, "artist",  openmpt_module_get_metadata(openmpt->module, "artist"));
+    add_meta(s, "title",   openmpt_module_get_metadata(openmpt->module, "title"));
+    add_meta(s, "encoder", openmpt_module_get_metadata(openmpt->module, "tracker"));
+    add_meta(s, "comment", openmpt_module_get_metadata(openmpt->module, "message"));
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(st, 64, 1, 1000);
+    if (st->duration > 0)
+        st->duration = openmpt->length;
+
+    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
+    st->codecpar->codec_id    = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE);
+    st->codecpar->channels    = openmpt->channels;
+    st->codecpar->sample_rate = openmpt->sample_rate;
+
+    return 0;
+}
+
+#define AUDIO_PKT_SIZE 2048
+
+static int read_packet_openmpt(AVFormatContext *s, AVPacket *pkt)
+{
+    OpenMPTContext *openmpt = s->priv_data;
+    int n_samples = AUDIO_PKT_SIZE / (openmpt->channels ? openmpt->channels*2 : 2);
+    int ret;
+
+    if ((ret = av_new_packet(pkt, AUDIO_PKT_SIZE)) < 0)
+        return ret;
+
+    switch (openmpt->channels) {
+    case 1: {
+        ret = openmpt_module_read_mono(openmpt->module, openmpt->sample_rate,
+                                       n_samples, (short *)pkt->data);
+        break;
+    }
+    case 2: {
+        ret = openmpt_module_read_interleaved_stereo(openmpt->module, openmpt->sample_rate,
+                                                    n_samples, (short *)pkt->data);
+        break;
+    }
+    case 4: {
+        ret = openmpt_module_read_interleaved_quad(openmpt->module, openmpt->sample_rate,
+                                                   n_samples, (short *)pkt->data);
+        break;
+    }
+    default:
+        av_log(s, AV_LOG_ERROR, "Invalid amount of channels: %d", openmpt->channels);
+        return AVERROR(EINVAL);
+    }
+
+    if (ret < 1 || (openmpt->length < openmpt_module_get_position_seconds(openmpt->module)))
+        return AVERROR_EOF;
+
+    pkt->size = AUDIO_PKT_SIZE;
+
+    return 0;
+}
+
+static int read_close_openmpt(AVFormatContext *s)
+{
+    OpenMPTContext *openmpt = s->priv_data;
+    openmpt_module_destroy(openmpt->module);
+    return 0;
+}
+
+static int read_seek_openmpt(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
+{
+    OpenMPTContext *openmpt = s->priv_data;
+    openmpt_module_set_position_seconds(openmpt->module, (double)ts/AV_TIME_BASE);
+    return 0;
+}
+
+static const AVClass class_openmpt = {
+    .class_name = "libopenmpt",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_libopenmpt_demuxer = {
+    .name           = "libopenmpt",
+    .long_name      = NULL_IF_CONFIG_SMALL("Tracker MOD format (libopenmpt)"),
+    .priv_data_size = sizeof(OpenMPTContext),
+    .read_probe     = probe_openmpt,
+    .read_header    = read_header_openmpt,
+    .read_packet    = read_packet_openmpt,
+    .read_close     = read_close_openmpt,
+    .read_seek      = read_seek_openmpt,
+    .priv_class     = &class_openmpt,
+    .extensions     = "mod",
+};
-- 
2.6.4 (Apple Git-63)



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