libopenmpt.c 7.38 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38
/*
 * 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
 */

#include <libopenmpt/libopenmpt.h>
#include <libopenmpt/libopenmpt_stream_callbacks_file.h>

#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "internal.h"

typedef struct OpenMPTContext {
    const AVClass *class;
    openmpt_module *module;

    int channels;
    double duration;
    /* options */
    int sample_rate;
    int64_t layout;
39
    int subsong;
40 41 42 43 44 45
} 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[] = {
46 47 48 49 50 51
    { "sample_rate", "set sample rate",    OFFSET(sample_rate), AV_OPT_TYPE_INT,            { .i64 = 48000 },               1000, INT_MAX,   A | D },
    { "layout",      "set channel layout", OFFSET(layout),      AV_OPT_TYPE_CHANNEL_LAYOUT, { .i64 = AV_CH_LAYOUT_STEREO }, 0,    INT64_MAX, A | D },
    { "subsong",     "set subsong",        OFFSET(subsong),     AV_OPT_TYPE_INT,            { .i64 = -2 },                  -2,   INT_MAX,   A | D, "subsong"},
    { "all",         "all",                0,                   AV_OPT_TYPE_CONST,          { .i64 = -1},                   0,    0,         A | D, "subsong" },
    { "auto",        "auto",               0,                   AV_OPT_TYPE_CONST,          { .i64 = -2},                   0,    0,         A | D, "subsong" },
    { NULL }
52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75
};

static void openmpt_logfunc(const char *message, void *userdata)
{
    int level = AV_LOG_INFO;
    if (strstr(message, "ERROR") != NULL) {
        level = AV_LOG_ERROR;
    }
    av_log(userdata, level, "%s\n", message);
}

#define add_meta(s, name, meta)                    \
do {                                               \
    const char *value = meta;                      \
    if (value && value[0])                         \
        av_dict_set(&s->metadata, name, value, 0); \
    openmpt_free_string(value);                    \
} while(0)

static int read_header_openmpt(AVFormatContext *s)
{
    AVStream *st;
    OpenMPTContext *openmpt = s->priv_data;
    int64_t size = avio_size(s->pb);
76 77
    if (!size)
        return AVERROR_INVALIDDATA;
78
    char *buf = av_malloc(size);
79 80
    int ret;

81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97

    if (!buf)
        return AVERROR(ENOMEM);
    size = avio_read(s->pb, buf, size);

    openmpt->module = openmpt_module_create_from_memory(buf, size, openmpt_logfunc, s, NULL);
    av_freep(&buf);
    if (!openmpt->module)
            return AVERROR_INVALIDDATA;

    openmpt->channels   = av_get_channel_layout_nb_channels(openmpt->layout);
    openmpt->duration   = 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"));
98
    add_meta(s, "date",    openmpt_module_get_metadata(openmpt->module, "date"));
99

100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
    if (openmpt->subsong >= openmpt_module_get_num_subsongs(openmpt->module)) {
        openmpt_module_destroy(openmpt->module);
        av_log(s, AV_LOG_ERROR, "Invalid subsong index: %d\n", openmpt->subsong);
        return AVERROR(EINVAL);
    }

    if (openmpt->subsong != -2) {
        if (openmpt->subsong >= 0) {
            av_dict_set_int(&s->metadata, "track", openmpt->subsong + 1, 0);
        }
        ret = openmpt_module_select_subsong(openmpt->module, openmpt->subsong);
        if (!ret){
            openmpt_module_destroy(openmpt->module);
            av_log(s, AV_LOG_ERROR, "Could not select requested subsong: %d", openmpt->subsong);
            return AVERROR(EINVAL);
        }
    }

118
    st = avformat_new_stream(s, NULL);
119 120 121
    if (!st) {
        openmpt_module_destroy(openmpt->module);
        openmpt->module = NULL;
122
        return AVERROR(ENOMEM);
123
    }
124 125
    avpriv_set_pts_info(st, 64, 1, AV_TIME_BASE);
    st->duration = llrint(openmpt->duration*AV_TIME_BASE);
126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177

    st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_id    = AV_NE(AV_CODEC_ID_PCM_F32BE, AV_CODEC_ID_PCM_F32LE);
    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*4 : 4);
    int ret;

    if ((ret = av_new_packet(pkt, AUDIO_PKT_SIZE)) < 0)
        return ret;

    switch (openmpt->channels) {
    case 1:
        ret = openmpt_module_read_float_mono(openmpt->module, openmpt->sample_rate,
                                             n_samples, (float *)pkt->data);
        break;
    case 2:
        ret = openmpt_module_read_interleaved_float_stereo(openmpt->module, openmpt->sample_rate,
                                                           n_samples, (float *)pkt->data);
        break;
    case 4:
        ret = openmpt_module_read_interleaved_float_quad(openmpt->module, openmpt->sample_rate,
                                                         n_samples, (float *)pkt->data);
        break;
    default:
        av_log(s, AV_LOG_ERROR, "Unsupported number of channels: %d", openmpt->channels);
        return AVERROR(EINVAL);
    }

    if (ret < 1) {
        pkt->size = 0;
        return AVERROR_EOF;
    }

    pkt->size = ret * (openmpt->channels * 4);

    return 0;
}

static int read_close_openmpt(AVFormatContext *s)
{
    OpenMPTContext *openmpt = s->priv_data;
    openmpt_module_destroy(openmpt->module);
178
    openmpt->module = NULL;
179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206
    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 formats (libopenmpt)"),
    .priv_data_size = sizeof(OpenMPTContext),
    .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     = "669,amf,ams,dbm,digi,dmf,dsm,far,gdm,imf,it,j2b,m15,mdl,med,mmcmp,mms,mo3,mod,mptm,mt2,mtm,nst,okt,plm,ppm,psm,pt36,ptm,s3m,sfx,sfx2,stk,stm,ult,umx,wow,xm,xpk",
};