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2ba45a60 DM |
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->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
130 | st->codec->codec_id = AV_NE(AV_CODEC_ID_PCM_S16BE, AV_CODEC_ID_PCM_S16LE); | |
131 | st->codec->channels = 2; | |
132 | st->codec->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 | }; |