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-rw-r--r--libavformat/libgme.c201
1 files changed, 201 insertions, 0 deletions
diff --git a/libavformat/libgme.c b/libavformat/libgme.c
new file mode 100644
index 0000000000..276477b308
--- /dev/null
+++ b/libavformat/libgme.c
@@ -0,0 +1,201 @@
+/*
+ * 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
+* libgme demuxer
+*/
+
+#include <gme/gme.h>
+#include "libavutil/avstring.h"
+#include "libavutil/eval.h"
+#include "libavutil/opt.h"
+#include "avformat.h"
+#include "internal.h"
+
+typedef struct GMEContext {
+ const AVClass *class;
+ Music_Emu *music_emu;
+ gme_info_t *info; ///< selected track
+
+ /* options */
+ int track_index;
+ int sample_rate;
+ int64_t max_size;
+} GMEContext;
+
+#define OFFSET(x) offsetof(GMEContext, x)
+#define A AV_OPT_FLAG_AUDIO_PARAM
+#define D AV_OPT_FLAG_DECODING_PARAM
+static const AVOption options[] = {
+ {"track_index", "set track that should be played", OFFSET(track_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, A|D},
+ {"sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 1000, 999999, A|D},
+ {"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},
+ {NULL}
+};
+
+static void add_meta(AVFormatContext *s, const char *name, const char *value)
+{
+ if (value && value[0])
+ av_dict_set(&s->metadata, name, value, 0);
+}
+
+static int load_metadata(AVFormatContext *s)
+{
+ GMEContext *gme = s->priv_data;
+ gme_info_t *info = gme->info;
+ char buf[30];
+
+ add_meta(s, "system", info->system);
+ add_meta(s, "game", info->game);
+ add_meta(s, "song", info->song);
+ add_meta(s, "author", info->author);
+ add_meta(s, "copyright", info->copyright);
+ add_meta(s, "comment", info->comment);
+ add_meta(s, "dumper", info->dumper);
+
+ snprintf(buf, sizeof(buf), "%d", (int)gme_track_count(gme->music_emu));
+ add_meta(s, "tracks", buf);
+
+ return 0;
+}
+
+#define AUDIO_PKT_SIZE 512
+
+static int read_header_gme(AVFormatContext *s)
+{
+ AVStream *st;
+ AVIOContext *pb = s->pb;
+ GMEContext *gme = s->priv_data;
+ int64_t sz = avio_size(pb);
+ char *buf;
+ char dummy;
+
+ if (sz < 0) {
+ av_log(s, AV_LOG_WARNING, "Could not determine file size\n");
+ sz = gme->max_size;
+ } else if (gme->max_size && sz > gme->max_size) {
+ sz = gme->max_size;
+ }
+
+ buf = av_malloc(sz);
+ if (!buf)
+ return AVERROR(ENOMEM);
+ sz = avio_read(pb, buf, sz);
+
+ // Data left means our buffer (the max_size option) is too small
+ if (avio_read(pb, &dummy, 1) == 1) {
+ av_log(s, AV_LOG_ERROR, "File size is larger than max_size option "
+ "value %"PRIi64", consider increasing the max_size option\n",
+ gme->max_size);
+ return AVERROR_BUFFER_TOO_SMALL;
+ }
+
+ if (gme_open_data(buf, sz, &gme->music_emu, gme->sample_rate)) {
+ av_freep(&buf);
+ return AVERROR_INVALIDDATA;
+ }
+ av_freep(&buf);
+
+ if (gme_track_info(gme->music_emu, &gme->info, gme->track_index))
+ return AVERROR_STREAM_NOT_FOUND;
+
+ if (gme_start_track(gme->music_emu, gme->track_index))
+ return AVERROR_UNKNOWN;
+
+ load_metadata(s);
+
+ 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 = gme->info->length;
+ st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codec->codec_id = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE);
+ st->codec->channels = 2;
+ st->codec->sample_rate = gme->sample_rate;
+
+ return 0;
+}
+
+static int read_packet_gme(AVFormatContext *s, AVPacket *pkt)
+{
+ GMEContext *gme = s->priv_data;
+ int n_samples = AUDIO_PKT_SIZE / 2;
+ int ret;
+
+ if (gme_track_ended(gme->music_emu))
+ return AVERROR_EOF;
+
+ if ((ret = av_new_packet(pkt, AUDIO_PKT_SIZE)) < 0)
+ return ret;
+
+ if (gme_play(gme->music_emu, n_samples, (short *)pkt->data))
+ return AVERROR_EXTERNAL;
+ pkt->size = AUDIO_PKT_SIZE;
+
+ return 0;
+}
+
+static int read_close_gme(AVFormatContext *s)
+{
+ GMEContext *gme = s->priv_data;
+ gme_free_info(gme->info);
+ gme_delete(gme->music_emu);
+ return 0;
+}
+
+static int read_seek_gme(AVFormatContext *s, int stream_idx, int64_t ts, int flags)
+{
+ GMEContext *gme = s->priv_data;
+ if (!gme_seek(gme->music_emu, (int)ts))
+ return AVERROR_EXTERNAL;
+ return 0;
+}
+
+static int probe_gme(AVProbeData *p)
+{
+ // Reads 4 bytes - returns "" if unknown format.
+ if (gme_identify_header(p->buf)[0]) {
+ if (p->buf_size < 16384)
+ return AVPROBE_SCORE_MAX / 4 ;
+ else
+ return AVPROBE_SCORE_MAX / 2;
+ }
+ return 0;
+}
+
+static const AVClass class_gme = {
+ .class_name = "Game Music Emu demuxer",
+ .item_name = av_default_item_name,
+ .option = options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+AVInputFormat ff_libgme_demuxer = {
+ .name = "libgme",
+ .long_name = NULL_IF_CONFIG_SMALL("Game Music Emu demuxer"),
+ .priv_data_size = sizeof(GMEContext),
+ .read_probe = probe_gme,
+ .read_header = read_header_gme,
+ .read_packet = read_packet_gme,
+ .read_close = read_close_gme,
+ .read_seek = read_seek_gme,
+ .priv_class = &class_gme,
+};