blob: 228273dc90f2b3f7d53da9ebd94e58f1ee9a1678
1 | /* |
2 | * This file is part of FFmpeg. |
3 | * |
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. |
8 | * |
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. |
13 | * |
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 |
17 | */ |
18 | |
19 | /** |
20 | * @file |
21 | * libgme demuxer |
22 | */ |
23 | |
24 | #include <gme/gme.h> |
25 | #include "libavutil/avstring.h" |
26 | #include "libavutil/eval.h" |
27 | #include "libavutil/opt.h" |
28 | #include "avformat.h" |
29 | #include "internal.h" |
30 | |
31 | typedef struct GMEContext { |
32 | const AVClass *class; |
33 | Music_Emu *music_emu; |
34 | gme_info_t *info; ///< selected track |
35 | |
36 | /* options */ |
37 | int track_index; |
38 | int sample_rate; |
39 | int64_t max_size; |
40 | } GMEContext; |
41 | |
42 | #define OFFSET(x) offsetof(GMEContext, x) |
43 | #define A AV_OPT_FLAG_AUDIO_PARAM |
44 | #define D AV_OPT_FLAG_DECODING_PARAM |
45 | static const AVOption options[] = { |
46 | {"track_index", "set track that should be played", OFFSET(track_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, A|D}, |
47 | {"sample_rate", "set sample rate", OFFSET(sample_rate), AV_OPT_TYPE_INT, {.i64 = 44100}, 1000, 999999, A|D}, |
48 | {"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}, |
49 | {NULL} |
50 | }; |
51 | |
52 | static void add_meta(AVFormatContext *s, const char *name, const char *value) |
53 | { |
54 | if (value && value[0]) |
55 | av_dict_set(&s->metadata, name, value, 0); |
56 | } |
57 | |
58 | static int load_metadata(AVFormatContext *s) |
59 | { |
60 | GMEContext *gme = s->priv_data; |
61 | gme_info_t *info = gme->info; |
62 | char buf[30]; |
63 | |
64 | add_meta(s, "system", info->system); |
65 | add_meta(s, "game", info->game); |
66 | add_meta(s, "song", info->song); |
67 | add_meta(s, "author", info->author); |
68 | add_meta(s, "copyright", info->copyright); |
69 | add_meta(s, "comment", info->comment); |
70 | add_meta(s, "dumper", info->dumper); |
71 | |
72 | snprintf(buf, sizeof(buf), "%d", (int)gme_track_count(gme->music_emu)); |
73 | add_meta(s, "tracks", buf); |
74 | |
75 | return 0; |
76 | } |
77 | |
78 | #define AUDIO_PKT_SIZE 512 |
79 | |
80 | static int read_header_gme(AVFormatContext *s) |
81 | { |
82 | AVStream *st; |
83 | AVIOContext *pb = s->pb; |
84 | GMEContext *gme = s->priv_data; |
85 | int64_t sz = avio_size(pb); |
86 | char *buf; |
87 | char dummy; |
88 | |
89 | if (sz < 0) { |
90 | av_log(s, AV_LOG_WARNING, "Could not determine file size\n"); |
91 | sz = gme->max_size; |
92 | } else if (gme->max_size && sz > gme->max_size) { |
93 | sz = gme->max_size; |
94 | } |
95 | |
96 | buf = av_malloc(sz); |
97 | if (!buf) |
98 | return AVERROR(ENOMEM); |
99 | sz = avio_read(pb, buf, sz); |
100 | |
101 | // Data left means our buffer (the max_size option) is too small |
102 | if (avio_read(pb, &dummy, 1) == 1) { |
103 | av_log(s, AV_LOG_ERROR, "File size is larger than max_size option " |
104 | "value %"PRIi64", consider increasing the max_size option\n", |
105 | gme->max_size); |
106 | return AVERROR_BUFFER_TOO_SMALL; |
107 | } |
108 | |
109 | if (gme_open_data(buf, sz, &gme->music_emu, gme->sample_rate)) { |
110 | av_freep(&buf); |
111 | return AVERROR_INVALIDDATA; |
112 | } |
113 | av_freep(&buf); |
114 | |
115 | if (gme_track_info(gme->music_emu, &gme->info, gme->track_index)) |
116 | return AVERROR_STREAM_NOT_FOUND; |
117 | |
118 | if (gme_start_track(gme->music_emu, gme->track_index)) |
119 | return AVERROR_UNKNOWN; |
120 | |
121 | load_metadata(s); |
122 | |
123 | st = avformat_new_stream(s, NULL); |
124 | if (!st) |
125 | return AVERROR(ENOMEM); |
126 | avpriv_set_pts_info(st, 64, 1, 1000); |
127 | if (st->duration > 0) |
128 | st->duration = gme->info->length; |
129 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
130 | st->codecpar->codec_id = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE); |
131 | st->codecpar->channels = 2; |
132 | st->codecpar->sample_rate = gme->sample_rate; |
133 | |
134 | return 0; |
135 | } |
136 | |
137 | static int read_packet_gme(AVFormatContext *s, AVPacket *pkt) |
138 | { |
139 | GMEContext *gme = s->priv_data; |
140 | int n_samples = AUDIO_PKT_SIZE / 2; |
141 | int ret; |
142 | |
143 | if (gme_track_ended(gme->music_emu)) |
144 | return AVERROR_EOF; |
145 | |
146 | if ((ret = av_new_packet(pkt, AUDIO_PKT_SIZE)) < 0) |
147 | return ret; |
148 | |
149 | if (gme_play(gme->music_emu, n_samples, (short *)pkt->data)) |
150 | return AVERROR_EXTERNAL; |
151 | pkt->size = AUDIO_PKT_SIZE; |
152 | |
153 | return 0; |
154 | } |
155 | |
156 | static int read_close_gme(AVFormatContext *s) |
157 | { |
158 | GMEContext *gme = s->priv_data; |
159 | gme_free_info(gme->info); |
160 | gme_delete(gme->music_emu); |
161 | return 0; |
162 | } |
163 | |
164 | static int read_seek_gme(AVFormatContext *s, int stream_idx, int64_t ts, int flags) |
165 | { |
166 | GMEContext *gme = s->priv_data; |
167 | if (!gme_seek(gme->music_emu, (int)ts)) |
168 | return AVERROR_EXTERNAL; |
169 | return 0; |
170 | } |
171 | |
172 | static int probe_gme(AVProbeData *p) |
173 | { |
174 | // Reads 4 bytes - returns "" if unknown format. |
175 | if (gme_identify_header(p->buf)[0]) { |
176 | if (p->buf_size < 16384) |
177 | return AVPROBE_SCORE_MAX / 4 ; |
178 | else |
179 | return AVPROBE_SCORE_MAX / 2; |
180 | } |
181 | return 0; |
182 | } |
183 | |
184 | static const AVClass class_gme = { |
185 | .class_name = "Game Music Emu demuxer", |
186 | .item_name = av_default_item_name, |
187 | .option = options, |
188 | .version = LIBAVUTIL_VERSION_INT, |
189 | }; |
190 | |
191 | AVInputFormat ff_libgme_demuxer = { |
192 | .name = "libgme", |
193 | .long_name = NULL_IF_CONFIG_SMALL("Game Music Emu demuxer"), |
194 | .priv_data_size = sizeof(GMEContext), |
195 | .read_probe = probe_gme, |
196 | .read_header = read_header_gme, |
197 | .read_packet = read_packet_gme, |
198 | .read_close = read_close_gme, |
199 | .read_seek = read_seek_gme, |
200 | .priv_class = &class_gme, |
201 | }; |
202 |