2 * This file is part of FFmpeg.
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
25 #include "libavutil/avstring.h"
26 #include "libavutil/eval.h"
27 #include "libavutil/opt.h"
31 typedef struct GMEContext {
41 #define OFFSET(x) offsetof(GMEContext, x)
42 #define A AV_OPT_FLAG_AUDIO_PARAM
43 #define D AV_OPT_FLAG_DECODING_PARAM
44 static const AVOption options[] = {
45 {"track_index", "set track that should be played", OFFSET(track_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, A|D},
46 {"sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 1000, 999999, A|D},
47 {"max_size", "set max file size supported (in bytes)", OFFSET(max_size), AV_OPT_TYPE_INT64, {.i64 = 50 * 1024 * 1024}, 0, SIZE_MAX, A|D},
51 static void add_meta(AVFormatContext *s, const char *name, const char *value)
53 if (value && value[0])
54 av_dict_set(&s->metadata, name, value, 0);
57 static int load_metadata(AVFormatContext *s, int64_t *duration)
59 GMEContext *gme = s->priv_data;
60 gme_info_t *info = NULL;
63 if (gme_track_info(gme->music_emu, &info, gme->track_index))
64 return AVERROR_STREAM_NOT_FOUND;
66 *duration = info->length;
67 add_meta(s, "system", info->system);
68 add_meta(s, "game", info->game);
69 add_meta(s, "song", info->song);
70 add_meta(s, "author", info->author);
71 add_meta(s, "copyright", info->copyright);
72 add_meta(s, "comment", info->comment);
73 add_meta(s, "dumper", info->dumper);
75 snprintf(buf, sizeof(buf), "%d", (int)gme_track_count(gme->music_emu));
76 add_meta(s, "tracks", buf);
82 #define AUDIO_PKT_SIZE 512
84 static int read_close_gme(AVFormatContext *s)
86 GMEContext *gme = s->priv_data;
87 gme_delete(gme->music_emu);
91 static int read_header_gme(AVFormatContext *s)
94 AVIOContext *pb = s->pb;
95 GMEContext *gme = s->priv_data;
96 int64_t sz = avio_size(pb);
103 av_log(s, AV_LOG_WARNING, "Could not determine file size\n");
105 } else if (gme->max_size && sz > gme->max_size) {
111 return AVERROR(ENOMEM);
112 sz = avio_read(pb, buf, sz);
114 // Data left means our buffer (the max_size option) is too small
115 if (avio_read(pb, &dummy, 1) == 1) {
116 av_log(s, AV_LOG_ERROR, "File size is larger than max_size option "
117 "value %"PRIi64", consider increasing the max_size option\n",
120 return AVERROR_BUFFER_TOO_SMALL;
123 if (gme_open_data(buf, sz, &gme->music_emu, gme->sample_rate)) {
125 return AVERROR_INVALIDDATA;
129 ret = load_metadata(s, &duration);
134 if (gme_start_track(gme->music_emu, gme->track_index)) {
136 return AVERROR_UNKNOWN;
139 st = avformat_new_stream(s, NULL);
142 return AVERROR(ENOMEM);
144 avpriv_set_pts_info(st, 64, 1, 1000);
146 st->duration = duration;
147 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
148 st->codecpar->codec_id = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE);
149 st->codecpar->channels = 2;
150 st->codecpar->sample_rate = gme->sample_rate;
155 static int read_packet_gme(AVFormatContext *s, AVPacket *pkt)
157 GMEContext *gme = s->priv_data;
158 int n_samples = AUDIO_PKT_SIZE / 2;
161 if (gme_track_ended(gme->music_emu))
164 if ((ret = av_new_packet(pkt, AUDIO_PKT_SIZE)) < 0)
167 if (gme_play(gme->music_emu, n_samples, (short *)pkt->data))
168 return AVERROR_EXTERNAL;
173 static int read_seek_gme(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
175 GMEContext *gme = s->priv_data;
176 if (!gme_seek(gme->music_emu, (int)ts))
177 return AVERROR_EXTERNAL;
181 static int probe_gme(const AVProbeData *p)
183 // Reads 4 bytes - returns "" if unknown format.
184 if (gme_identify_header(p->buf)[0]) {
185 if (p->buf_size < 16384)
186 return AVPROBE_SCORE_MAX / 4 ;
188 return AVPROBE_SCORE_MAX / 2;
193 static const AVClass class_gme = {
194 .class_name = "Game Music Emu demuxer",
195 .item_name = av_default_item_name,
197 .version = LIBAVUTIL_VERSION_INT,
200 AVInputFormat ff_libgme_demuxer = {
202 .long_name = NULL_IF_CONFIG_SMALL("Game Music Emu demuxer"),
203 .priv_data_size = sizeof(GMEContext),
204 .read_probe = probe_gme,
205 .read_header = read_header_gme,
206 .read_packet = read_packet_gme,
207 .read_close = read_close_gme,
208 .read_seek = read_seek_gme,
209 .priv_class = &class_gme,