| /* |
| * 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->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 = 2; |
| st->codecpar->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(const 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, |
| }; |