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ffmpeg/libavformat/libmodplug.c

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/*
* 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 better probing than extensions matching
*/
#include <libmodplug/modplug.h>
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
typedef struct ModPlugContext {
const AVClass *class;
ModPlugFile *f;
uint8_t *buf; ///< input file content
/* options */
int noise_reduction;
int reverb_depth;
int reverb_delay;
int bass_amount;
int bass_range;
int surround_depth;
int surround_delay;
int max_size; ///< max file size to allocate
} ModPlugContext;
#define FF_MODPLUG_MAX_FILE_SIZE (100 * 1<<20) // 100M
#define FF_MODPLUG_DEF_FILE_SIZE ( 5 * 1<<20) // 5M
#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},
{"max_size", "Max file size supported (in bytes). Default is 5MB. Set to 0 for no limit (not recommended)",
OFFSET(max_size), FF_OPT_TYPE_INT, {.dbl = FF_MODPLUG_DEF_FILE_SIZE}, 0, FF_MODPLUG_MAX_FILE_SIZE, D},
{NULL},
};
#define SET_OPT_IF_REQUESTED(libopt, opt, flag) do { \
if (modplug->opt) { \
settings.libopt = modplug->opt; \
settings.mFlags |= flag; \
} \
} while (0)
#define ADD_META_MULTIPLE_ENTRIES(entry_name, fname) do { \
if (n_## entry_name ##s) { \
unsigned i, n = 0; \
\
for (i = 0; i < n_## entry_name ##s; i++) { \
char item_name[64] = {0}; \
fname(f, i, item_name); \
if (!*item_name) \
continue; \
if (n) \
av_dict_set(&s->metadata, #entry_name, "\n", AV_DICT_APPEND); \
av_dict_set(&s->metadata, #entry_name, item_name, AV_DICT_APPEND); \
n++; \
} \
\
extra = av_asprintf(", %u/%u " #entry_name "%s", \
n, n_## entry_name ##s, n > 1 ? "s" : ""); \
if (!extra) \
return AVERROR(ENOMEM); \
av_dict_set(&s->metadata, "extra info", extra, AV_DICT_APPEND); \
av_free(extra); \
} \
} while (0)
static int modplug_load_metadata(AVFormatContext *s)
{
ModPlugContext *modplug = s->priv_data;
ModPlugFile *f = modplug->f;
char *extra;
const char *name = ModPlug_GetName(f);
const char *msg = ModPlug_GetMessage(f);
unsigned n_instruments = ModPlug_NumInstruments(f);
unsigned n_samples = ModPlug_NumSamples(f);
unsigned n_patterns = ModPlug_NumPatterns(f);
unsigned n_channels = ModPlug_NumChannels(f);
if (name && *name) av_dict_set(&s->metadata, "name", name, 0);
if (msg && *msg) av_dict_set(&s->metadata, "message", msg, 0);
extra = av_asprintf("%u pattern%s, %u channel%s",
n_patterns, n_patterns > 1 ? "s" : "",
n_channels, n_channels > 1 ? "s" : "");
if (!extra)
return AVERROR(ENOMEM);
av_dict_set(&s->metadata, "extra info", extra, AV_DICT_DONT_STRDUP_VAL);
ADD_META_MULTIPLE_ENTRIES(instrument, ModPlug_InstrumentName);
ADD_META_MULTIPLE_ENTRIES(sample, ModPlug_SampleName);
return 0;
}
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_size(pb);
if (sz < 0) {
av_log(s, AV_LOG_WARNING, "Could not determine file size\n");
sz = modplug->max_size;
} else if (modplug->max_size && sz > modplug->max_size) {
sz = modplug->max_size;
av_log(s, AV_LOG_WARNING, "Max file size reach%s, allocating %dB "
"but demuxing is likely to fail due to incomplete buffer\n",
sz == FF_MODPLUG_DEF_FILE_SIZE ? " (see -max_size)" : "", sz);
}
modplug->buf = av_malloc(modplug->max_size);
if (!modplug->buf)
return AVERROR(ENOMEM);
sz = avio_read(pb, modplug->buf, sz);
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
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);
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 modplug_load_metadata(s);
}
static int modplug_read_packet(AVFormatContext *s, AVPacket *pkt)
{
ModPlugContext *modplug = s->priv_data;
if (av_new_packet(pkt, 512) < 0)
return AVERROR(ENOMEM);
pkt->size = ModPlug_Read(modplug->f, pkt->data, 512);
if (pkt->size <= 0) {
av_free_packet(pkt);
return pkt->size == 0 ? AVERROR_EOF : AVERROR(EIO);
}
return 0;
}
static int modplug_read_close(AVFormatContext *s)
{
ModPlugContext *modplug = s->priv_data;
ModPlug_Unload(modplug->f);
av_freep(&modplug->buf);
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;
}
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"),
.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
.priv_class = &modplug_class,
};
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