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1 | /* |
2 | * BRSTM demuxer | |
3 | * Copyright (c) 2012 Paul B Mahol | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include "libavutil/intreadwrite.h" | |
23 | #include "libavcodec/bytestream.h" | |
24 | #include "avformat.h" | |
25 | #include "internal.h" | |
26 | ||
27 | typedef struct BRSTMDemuxContext { | |
28 | uint32_t block_size; | |
29 | uint32_t block_count; | |
30 | uint32_t current_block; | |
31 | uint32_t samples_per_block; | |
32 | uint32_t last_block_used_bytes; | |
33 | uint8_t *table; | |
34 | uint8_t *adpc; | |
35 | } BRSTMDemuxContext; | |
36 | ||
37 | static int probe(AVProbeData *p) | |
38 | { | |
39 | if (AV_RL32(p->buf) == MKTAG('R','S','T','M') && | |
40 | (AV_RL16(p->buf + 4) == 0xFFFE || | |
41 | AV_RL16(p->buf + 4) == 0xFEFF)) | |
42 | return AVPROBE_SCORE_MAX / 3 * 2; | |
43 | return 0; | |
44 | } | |
45 | ||
46 | static int read_close(AVFormatContext *s) | |
47 | { | |
48 | BRSTMDemuxContext *b = s->priv_data; | |
49 | ||
50 | av_freep(&b->table); | |
51 | av_freep(&b->adpc); | |
52 | ||
53 | return 0; | |
54 | } | |
55 | ||
56 | static int read_header(AVFormatContext *s) | |
57 | { | |
58 | BRSTMDemuxContext *b = s->priv_data; | |
59 | int bom, major, minor, codec, chunk; | |
60 | int64_t pos, h1offset, toffset; | |
61 | uint32_t size, start, asize; | |
62 | AVStream *st; | |
63 | int ret = AVERROR_EOF; | |
64 | ||
65 | st = avformat_new_stream(s, NULL); | |
66 | if (!st) | |
67 | return AVERROR(ENOMEM); | |
68 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
69 | ||
70 | avio_skip(s->pb, 4); | |
71 | ||
72 | bom = avio_rb16(s->pb); | |
73 | if (bom != 0xFEFF && bom != 0xFFFE) { | |
74 | av_log(s, AV_LOG_ERROR, "invalid byte order: %X\n", bom); | |
75 | return AVERROR_INVALIDDATA; | |
76 | } | |
77 | if (bom == 0xFFFE) { | |
78 | avpriv_request_sample(s, "little endian byte order"); | |
79 | return AVERROR_PATCHWELCOME; | |
80 | } | |
81 | ||
82 | major = avio_r8(s->pb); | |
83 | minor = avio_r8(s->pb); | |
84 | avio_skip(s->pb, 4); // size of file | |
85 | size = avio_rb16(s->pb); | |
86 | if (size < 14) | |
87 | return AVERROR_INVALIDDATA; | |
88 | ||
89 | avio_skip(s->pb, size - 14); | |
90 | pos = avio_tell(s->pb); | |
91 | if (avio_rl32(s->pb) != MKTAG('H','E','A','D')) | |
92 | return AVERROR_INVALIDDATA; | |
93 | size = avio_rb32(s->pb); | |
94 | if (size < 256) | |
95 | return AVERROR_INVALIDDATA; | |
96 | avio_skip(s->pb, 4); // unknown | |
97 | h1offset = avio_rb32(s->pb); | |
98 | if (h1offset > size) | |
99 | return AVERROR_INVALIDDATA; | |
100 | avio_skip(s->pb, 12); | |
101 | toffset = avio_rb32(s->pb) + 16LL; | |
102 | if (toffset > size) | |
103 | return AVERROR_INVALIDDATA; | |
104 | ||
105 | avio_skip(s->pb, pos + h1offset + 8 - avio_tell(s->pb)); | |
106 | codec = avio_r8(s->pb); | |
107 | ||
108 | switch (codec) { | |
109 | case 0: codec = AV_CODEC_ID_PCM_S8_PLANAR; break; | |
110 | case 1: codec = AV_CODEC_ID_PCM_S16BE_PLANAR; break; | |
111 | case 2: codec = AV_CODEC_ID_ADPCM_THP; break; | |
112 | default: | |
113 | avpriv_request_sample(s, "codec %d", codec); | |
114 | return AVERROR_PATCHWELCOME; | |
115 | } | |
116 | ||
117 | avio_skip(s->pb, 1); // loop flag | |
118 | st->codec->codec_id = codec; | |
119 | st->codec->channels = avio_r8(s->pb); | |
120 | if (!st->codec->channels) | |
121 | return AVERROR_INVALIDDATA; | |
122 | ||
123 | avio_skip(s->pb, 1); // padding | |
124 | st->codec->sample_rate = avio_rb16(s->pb); | |
125 | if (!st->codec->sample_rate) | |
126 | return AVERROR_INVALIDDATA; | |
127 | ||
128 | avio_skip(s->pb, 2); // padding | |
129 | avio_skip(s->pb, 4); // loop start sample | |
130 | st->start_time = 0; | |
131 | st->duration = avio_rb32(s->pb); | |
132 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
133 | ||
134 | start = avio_rb32(s->pb); | |
135 | b->current_block = 0; | |
136 | b->block_count = avio_rb32(s->pb); | |
137 | if (b->block_count > UINT16_MAX) { | |
138 | av_log(s, AV_LOG_WARNING, "too many blocks: %u\n", b->block_count); | |
139 | return AVERROR_INVALIDDATA; | |
140 | } | |
141 | ||
142 | b->block_size = avio_rb32(s->pb); | |
143 | if (b->block_size > UINT16_MAX / st->codec->channels) | |
144 | return AVERROR_INVALIDDATA; | |
145 | b->block_size *= st->codec->channels; | |
146 | ||
147 | b->samples_per_block = avio_rb32(s->pb); | |
148 | b->last_block_used_bytes = avio_rb32(s->pb); | |
149 | if (b->last_block_used_bytes > UINT16_MAX / st->codec->channels) | |
150 | return AVERROR_INVALIDDATA; | |
151 | b->last_block_used_bytes *= st->codec->channels; | |
152 | ||
153 | avio_skip(s->pb, 4); // last block samples | |
154 | avio_skip(s->pb, 4); // last block size | |
155 | ||
156 | if (codec == AV_CODEC_ID_ADPCM_THP) { | |
157 | int ch; | |
158 | ||
159 | avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); | |
160 | toffset = avio_rb32(s->pb) + 16LL; | |
161 | if (toffset > size) | |
162 | return AVERROR_INVALIDDATA; | |
163 | ||
164 | avio_skip(s->pb, pos + toffset - avio_tell(s->pb)); | |
165 | b->table = av_mallocz(32 * st->codec->channels); | |
166 | if (!b->table) | |
167 | return AVERROR(ENOMEM); | |
168 | ||
169 | for (ch = 0; ch < st->codec->channels; ch++) { | |
170 | if (avio_read(s->pb, b->table + ch * 32, 32) != 32) { | |
171 | ret = AVERROR_INVALIDDATA; | |
172 | goto fail; | |
173 | } | |
174 | avio_skip(s->pb, 24); | |
175 | } | |
176 | } | |
177 | ||
178 | if (size < (avio_tell(s->pb) - pos)) { | |
179 | ret = AVERROR_INVALIDDATA; | |
180 | goto fail; | |
181 | } | |
182 | avio_skip(s->pb, size - (avio_tell(s->pb) - pos)); | |
183 | ||
184 | while (!avio_feof(s->pb)) { | |
185 | chunk = avio_rl32(s->pb); | |
186 | size = avio_rb32(s->pb); | |
187 | if (size < 8) { | |
188 | ret = AVERROR_INVALIDDATA; | |
189 | goto fail; | |
190 | } | |
191 | size -= 8; | |
192 | switch (chunk) { | |
193 | case MKTAG('A','D','P','C'): | |
194 | if (codec != AV_CODEC_ID_ADPCM_THP) | |
195 | goto skip; | |
196 | ||
197 | asize = b->block_count * st->codec->channels * 4; | |
198 | if (size < asize) { | |
199 | ret = AVERROR_INVALIDDATA; | |
200 | goto fail; | |
201 | } | |
202 | if (b->adpc) { | |
203 | av_log(s, AV_LOG_WARNING, "skipping additional ADPC chunk\n"); | |
204 | goto skip; | |
205 | } else { | |
206 | b->adpc = av_mallocz(asize); | |
207 | if (!b->adpc) { | |
208 | ret = AVERROR(ENOMEM); | |
209 | goto fail; | |
210 | } | |
211 | avio_read(s->pb, b->adpc, asize); | |
212 | avio_skip(s->pb, size - asize); | |
213 | } | |
214 | break; | |
215 | case MKTAG('D','A','T','A'): | |
216 | if ((start < avio_tell(s->pb)) || | |
217 | (!b->adpc && codec == AV_CODEC_ID_ADPCM_THP)) { | |
218 | ret = AVERROR_INVALIDDATA; | |
219 | goto fail; | |
220 | } | |
221 | avio_skip(s->pb, start - avio_tell(s->pb)); | |
222 | ||
223 | if (major != 1 || minor) | |
224 | avpriv_request_sample(s, "Version %d.%d", major, minor); | |
225 | ||
226 | return 0; | |
227 | default: | |
228 | av_log(s, AV_LOG_WARNING, "skipping unknown chunk: %X\n", chunk); | |
229 | skip: | |
230 | avio_skip(s->pb, size); | |
231 | } | |
232 | } | |
233 | ||
234 | fail: | |
235 | read_close(s); | |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
240 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
241 | { | |
242 | AVCodecContext *codec = s->streams[0]->codec; | |
243 | BRSTMDemuxContext *b = s->priv_data; | |
244 | uint32_t samples, size; | |
245 | int ret; | |
246 | ||
247 | if (avio_feof(s->pb)) | |
248 | return AVERROR_EOF; | |
249 | b->current_block++; | |
250 | if (b->current_block == b->block_count) { | |
251 | size = b->last_block_used_bytes; | |
252 | samples = size / (8 * codec->channels) * 14; | |
253 | } else if (b->current_block < b->block_count) { | |
254 | size = b->block_size; | |
255 | samples = b->samples_per_block; | |
256 | } else { | |
257 | return AVERROR_EOF; | |
258 | } | |
259 | ||
260 | if (codec->codec_id == AV_CODEC_ID_ADPCM_THP) { | |
261 | uint8_t *dst; | |
262 | ||
263 | if (av_new_packet(pkt, 8 + (32 + 4) * codec->channels + size) < 0) | |
264 | return AVERROR(ENOMEM); | |
265 | dst = pkt->data; | |
266 | bytestream_put_be32(&dst, size); | |
267 | bytestream_put_be32(&dst, samples); | |
268 | bytestream_put_buffer(&dst, b->table, 32 * codec->channels); | |
269 | bytestream_put_buffer(&dst, b->adpc + 4 * codec->channels * | |
270 | (b->current_block - 1), 4 * codec->channels); | |
271 | ||
272 | ret = avio_read(s->pb, dst, size); | |
273 | if (ret != size) | |
274 | av_free_packet(pkt); | |
275 | pkt->duration = samples; | |
276 | } else { | |
277 | ret = av_get_packet(s->pb, pkt, size); | |
278 | } | |
279 | ||
280 | pkt->stream_index = 0; | |
281 | ||
282 | if (ret != size) | |
283 | ret = AVERROR(EIO); | |
284 | ||
285 | return ret; | |
286 | } | |
287 | ||
288 | AVInputFormat ff_brstm_demuxer = { | |
289 | .name = "brstm", | |
290 | .long_name = NULL_IF_CONFIG_SMALL("BRSTM (Binary Revolution Stream)"), | |
291 | .priv_data_size = sizeof(BRSTMDemuxContext), | |
292 | .read_probe = probe, | |
293 | .read_header = read_header, | |
294 | .read_packet = read_packet, | |
295 | .read_close = read_close, | |
296 | .extensions = "brstm", | |
297 | }; |