1 /*
2 * LEGO Racers ALP (.tun & .pcm) (de)muxer
3 *
4 * Copyright (C) 2020 Zane van Iperen (zane@zanevaniperen.com)
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22 #include "avformat.h"
23 #include "internal.h"
24 #include "rawenc.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/internal.h"
27 #include "libavutil/opt.h"
28
29 #define ALP_TAG MKTAG('A', 'L', 'P', ' ')
30 #define ALP_MAX_READ_SIZE 4096
31
32 typedef struct ALPHeader {
33 uint32_t magic; /*< Magic Number, {'A', 'L', 'P', ' '} */
34 uint32_t header_size; /*< Header size (after this). */
35 char adpcm[6]; /*< "ADPCM" */
36 uint8_t unk1; /*< Unknown */
37 uint8_t num_channels; /*< Channel Count. */
38 uint32_t sample_rate; /*< Sample rate, only if header_size >= 12. */
39 } ALPHeader;
40
41 typedef enum ALPType {
42 ALP_TYPE_AUTO = 0, /*< Autodetect based on file extension. */
43 ALP_TYPE_TUN = 1, /*< Force a .TUN file. */
44 ALP_TYPE_PCM = 2, /*< Force a .PCM file. */
45 } ALPType;
46
47 typedef struct ALPMuxContext {
48 const AVClass *class;
49 ALPType type;
50 } ALPMuxContext;
51
52 #if CONFIG_ALP_DEMUXER
alp_probe(const AVProbeData * p)53 static int alp_probe(const AVProbeData *p)
54 {
55 uint32_t i;
56
57 if (AV_RL32(p->buf) != ALP_TAG)
58 return 0;
59
60 /* Only allowed header sizes are 8 and 12. */
61 i = AV_RL32(p->buf + 4);
62 if (i != 8 && i != 12)
63 return 0;
64
65 if (strncmp("ADPCM", p->buf + 8, 6) != 0)
66 return 0;
67
68 return AVPROBE_SCORE_MAX - 1;
69 }
70
alp_read_header(AVFormatContext * s)71 static int alp_read_header(AVFormatContext *s)
72 {
73 int ret;
74 AVStream *st;
75 ALPHeader *hdr = s->priv_data;
76 AVCodecParameters *par;
77
78 if ((hdr->magic = avio_rl32(s->pb)) != ALP_TAG)
79 return AVERROR_INVALIDDATA;
80
81 hdr->header_size = avio_rl32(s->pb);
82
83 if (hdr->header_size != 8 && hdr->header_size != 12) {
84 return AVERROR_INVALIDDATA;
85 }
86
87 if ((ret = avio_read(s->pb, hdr->adpcm, sizeof(hdr->adpcm))) < 0)
88 return ret;
89 else if (ret != sizeof(hdr->adpcm))
90 return AVERROR(EIO);
91
92 if (strncmp("ADPCM", hdr->adpcm, sizeof(hdr->adpcm)) != 0)
93 return AVERROR_INVALIDDATA;
94
95 hdr->unk1 = avio_r8(s->pb);
96 hdr->num_channels = avio_r8(s->pb);
97
98 if (hdr->header_size == 8) {
99 /* .TUN music file */
100 hdr->sample_rate = 22050;
101
102 } else {
103 /* .PCM sound file */
104 hdr->sample_rate = avio_rl32(s->pb);
105 }
106
107 if (hdr->sample_rate > 44100) {
108 avpriv_request_sample(s, "Sample Rate > 44100");
109 return AVERROR_PATCHWELCOME;
110 }
111
112 if (!(st = avformat_new_stream(s, NULL)))
113 return AVERROR(ENOMEM);
114
115 par = st->codecpar;
116 par->codec_type = AVMEDIA_TYPE_AUDIO;
117 par->codec_id = AV_CODEC_ID_ADPCM_IMA_ALP;
118 par->format = AV_SAMPLE_FMT_S16;
119 par->sample_rate = hdr->sample_rate;
120 par->channels = hdr->num_channels;
121
122 if (hdr->num_channels == 1)
123 par->channel_layout = AV_CH_LAYOUT_MONO;
124 else if (hdr->num_channels == 2)
125 par->channel_layout = AV_CH_LAYOUT_STEREO;
126 else
127 return AVERROR_INVALIDDATA;
128
129 par->bits_per_coded_sample = 4;
130 par->bits_per_raw_sample = 16;
131 par->block_align = 1;
132 par->bit_rate = par->channels *
133 par->sample_rate *
134 par->bits_per_coded_sample;
135
136 avpriv_set_pts_info(st, 64, 1, par->sample_rate);
137 return 0;
138 }
139
alp_read_packet(AVFormatContext * s,AVPacket * pkt)140 static int alp_read_packet(AVFormatContext *s, AVPacket *pkt)
141 {
142 int ret;
143 AVCodecParameters *par = s->streams[0]->codecpar;
144
145 if ((ret = av_get_packet(s->pb, pkt, ALP_MAX_READ_SIZE)) < 0)
146 return ret;
147
148 pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
149 pkt->stream_index = 0;
150 pkt->duration = ret * 2 / par->channels;
151
152 return 0;
153 }
154
alp_seek(AVFormatContext * s,int stream_index,int64_t pts,int flags)155 static int alp_seek(AVFormatContext *s, int stream_index,
156 int64_t pts, int flags)
157 {
158 const ALPHeader *hdr = s->priv_data;
159
160 if (pts != 0)
161 return AVERROR(EINVAL);
162
163 return avio_seek(s->pb, hdr->header_size + 8, SEEK_SET);
164 }
165
166 AVInputFormat ff_alp_demuxer = {
167 .name = "alp",
168 .long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
169 .priv_data_size = sizeof(ALPHeader),
170 .read_probe = alp_probe,
171 .read_header = alp_read_header,
172 .read_packet = alp_read_packet,
173 .read_seek = alp_seek,
174 };
175 #endif
176
177 #if CONFIG_ALP_MUXER
178
alp_write_init(AVFormatContext * s)179 static int alp_write_init(AVFormatContext *s)
180 {
181 ALPMuxContext *alp = s->priv_data;
182 AVCodecParameters *par;
183
184 if (alp->type == ALP_TYPE_AUTO) {
185 if (av_match_ext(s->url, "pcm"))
186 alp->type = ALP_TYPE_PCM;
187 else
188 alp->type = ALP_TYPE_TUN;
189 }
190
191 if (s->nb_streams != 1) {
192 av_log(s, AV_LOG_ERROR, "Too many streams\n");
193 return AVERROR(EINVAL);
194 }
195
196 par = s->streams[0]->codecpar;
197
198 if (par->codec_id != AV_CODEC_ID_ADPCM_IMA_ALP) {
199 av_log(s, AV_LOG_ERROR, "%s codec not supported\n",
200 avcodec_get_name(par->codec_id));
201 return AVERROR(EINVAL);
202 }
203
204 if (par->channels > 2) {
205 av_log(s, AV_LOG_ERROR, "A maximum of 2 channels are supported\n");
206 return AVERROR(EINVAL);
207 }
208
209 if (par->sample_rate > 44100) {
210 av_log(s, AV_LOG_ERROR, "Sample rate too large\n");
211 return AVERROR(EINVAL);
212 }
213
214 if (alp->type == ALP_TYPE_TUN && par->sample_rate != 22050) {
215 av_log(s, AV_LOG_ERROR, "Sample rate must be 22050 for TUN files\n");
216 return AVERROR(EINVAL);
217 }
218 return 0;
219 }
220
alp_write_header(AVFormatContext * s)221 static int alp_write_header(AVFormatContext *s)
222 {
223 ALPMuxContext *alp = s->priv_data;
224 AVCodecParameters *par = s->streams[0]->codecpar;
225
226 avio_wl32(s->pb, ALP_TAG);
227 avio_wl32(s->pb, alp->type == ALP_TYPE_PCM ? 12 : 8);
228 avio_write(s->pb, "ADPCM", 6);
229 avio_w8(s->pb, 0);
230 avio_w8(s->pb, par->channels);
231 if (alp->type == ALP_TYPE_PCM)
232 avio_wl32(s->pb, par->sample_rate);
233
234 return 0;
235 }
236
237 enum { AE = AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_ENCODING_PARAM };
238
239 static const AVOption alp_options[] = {
240 {
241 .name = "type",
242 .help = "set file type",
243 .offset = offsetof(ALPMuxContext, type),
244 .type = AV_OPT_TYPE_INT,
245 .default_val = {.i64 = ALP_TYPE_AUTO},
246 .min = ALP_TYPE_AUTO,
247 .max = ALP_TYPE_PCM,
248 .flags = AE,
249 .unit = "type",
250 },
251 {
252 .name = "auto",
253 .help = "autodetect based on file extension",
254 .offset = 0,
255 .type = AV_OPT_TYPE_CONST,
256 .default_val = {.i64 = ALP_TYPE_AUTO},
257 .min = 0,
258 .max = 0,
259 .flags = AE,
260 .unit = "type"
261 },
262 {
263 .name = "tun",
264 .help = "force .tun, used for music",
265 .offset = 0,
266 .type = AV_OPT_TYPE_CONST,
267 .default_val = {.i64 = ALP_TYPE_TUN},
268 .min = 0,
269 .max = 0,
270 .flags = AE,
271 .unit = "type"
272 },
273 {
274 .name = "pcm",
275 .help = "force .pcm, used for sfx",
276 .offset = 0,
277 .type = AV_OPT_TYPE_CONST,
278 .default_val = {.i64 = ALP_TYPE_PCM},
279 .min = 0,
280 .max = 0,
281 .flags = AE,
282 .unit = "type"
283 },
284 { NULL }
285 };
286
287 static const AVClass alp_muxer_class = {
288 .class_name = "alp",
289 .item_name = av_default_item_name,
290 .option = alp_options,
291 .version = LIBAVUTIL_VERSION_INT
292 };
293
294 AVOutputFormat ff_alp_muxer = {
295 .name = "alp",
296 .long_name = NULL_IF_CONFIG_SMALL("LEGO Racers ALP"),
297 .extensions = "tun,pcm",
298 .audio_codec = AV_CODEC_ID_ADPCM_IMA_ALP,
299 .video_codec = AV_CODEC_ID_NONE,
300 .init = alp_write_init,
301 .write_header = alp_write_header,
302 .write_packet = ff_raw_write_packet,
303 .priv_class = &alp_muxer_class,
304 .priv_data_size = sizeof(ALPMuxContext)
305 };
306 #endif
307