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1 | /* | ||
2 | * Digital Speech Standard (DSS) demuxer | ||
3 | * Copyright (c) 2014 Oleksij Rempel <linux@rempel-privat.de> | ||
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/channel_layout.h" | ||
23 | #include "libavutil/intreadwrite.h" | ||
24 | |||
25 | #include "avformat.h" | ||
26 | #include "demux.h" | ||
27 | #include "internal.h" | ||
28 | |||
29 | #define DSS_HEAD_OFFSET_AUTHOR 0xc | ||
30 | #define DSS_AUTHOR_SIZE 16 | ||
31 | |||
32 | #define DSS_HEAD_OFFSET_START_TIME 0x26 | ||
33 | #define DSS_HEAD_OFFSET_END_TIME 0x32 | ||
34 | #define DSS_TIME_SIZE 12 | ||
35 | |||
36 | #define DSS_HEAD_OFFSET_ACODEC 0x2a4 | ||
37 | #define DSS_ACODEC_DSS_SP 0x0 /* SP mode */ | ||
38 | #define DSS_ACODEC_G723_1 0x2 /* LP mode */ | ||
39 | |||
40 | #define DSS_HEAD_OFFSET_COMMENT 0x31e | ||
41 | #define DSS_COMMENT_SIZE 64 | ||
42 | |||
43 | #define DSS_BLOCK_SIZE 512 | ||
44 | #define DSS_AUDIO_BLOCK_HEADER_SIZE 6 | ||
45 | #define DSS_FRAME_SIZE 42 | ||
46 | |||
47 | static const uint8_t frame_size[4] = { 24, 20, 4, 1 }; | ||
48 | |||
49 | typedef struct DSSDemuxContext { | ||
50 | unsigned int audio_codec; | ||
51 | int counter; | ||
52 | int swap; | ||
53 | int dss_sp_swap_byte; | ||
54 | |||
55 | int packet_size; | ||
56 | int dss_header_size; | ||
57 | } DSSDemuxContext; | ||
58 | |||
59 | 7124 | static int dss_probe(const AVProbeData *p) | |
60 | { | ||
61 |
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7124 | if ( AV_RL32(p->buf) != MKTAG(0x2, 'd', 's', 's') |
62 |
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7122 | && AV_RL32(p->buf) != MKTAG(0x3, 'd', 's', 's')) |
63 | 7122 | return 0; | |
64 | |||
65 | 2 | return AVPROBE_SCORE_MAX; | |
66 | } | ||
67 | |||
68 | 2 | static int dss_read_metadata_date(AVFormatContext *s, unsigned int offset, | |
69 | const char *key) | ||
70 | { | ||
71 | 2 | AVIOContext *pb = s->pb; | |
72 | 2 | char datetime[64], string[DSS_TIME_SIZE + 1] = { 0 }; | |
73 | int y, month, d, h, minute, sec; | ||
74 | int ret; | ||
75 | |||
76 | 2 | avio_seek(pb, offset, SEEK_SET); | |
77 | |||
78 | 2 | ret = avio_read(s->pb, string, DSS_TIME_SIZE); | |
79 |
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2 | if (ret < DSS_TIME_SIZE) |
80 | ✗ | return ret < 0 ? ret : AVERROR_EOF; | |
81 | |||
82 |
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2 | if (sscanf(string, "%2d%2d%2d%2d%2d%2d", &y, &month, &d, &h, &minute, &sec) != 6) |
83 | ✗ | return AVERROR_INVALIDDATA; | |
84 | /* We deal with a two-digit year here, so set the default date to 2000 | ||
85 | * and hope it will never be used in the next century. */ | ||
86 | 2 | snprintf(datetime, sizeof(datetime), "%.4d-%.2d-%.2dT%.2d:%.2d:%.2d", | |
87 | y + 2000, month, d, h, minute, sec); | ||
88 | 2 | return av_dict_set(&s->metadata, key, datetime, 0); | |
89 | } | ||
90 | |||
91 | 4 | static int dss_read_metadata_string(AVFormatContext *s, unsigned int offset, | |
92 | unsigned int size, const char *key) | ||
93 | { | ||
94 | 4 | AVIOContext *pb = s->pb; | |
95 | char *value; | ||
96 | int ret; | ||
97 | |||
98 | 4 | avio_seek(pb, offset, SEEK_SET); | |
99 | |||
100 | 4 | value = av_mallocz(size + 1); | |
101 |
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4 | if (!value) |
102 | ✗ | return AVERROR(ENOMEM); | |
103 | |||
104 | 4 | ret = avio_read(s->pb, value, size); | |
105 |
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4 | if (ret < size) { |
106 | ✗ | av_free(value); | |
107 | ✗ | return ret < 0 ? ret : AVERROR_EOF; | |
108 | } | ||
109 | |||
110 | 4 | return av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); | |
111 | } | ||
112 | |||
113 | 2 | static int dss_read_header(AVFormatContext *s) | |
114 | { | ||
115 | 2 | DSSDemuxContext *ctx = s->priv_data; | |
116 | 2 | AVIOContext *pb = s->pb; | |
117 | AVStream *st; | ||
118 | int ret, version; | ||
119 | |||
120 | 2 | st = avformat_new_stream(s, NULL); | |
121 |
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2 | if (!st) |
122 | ✗ | return AVERROR(ENOMEM); | |
123 | |||
124 | 2 | version = avio_r8(pb); | |
125 | 2 | ctx->dss_header_size = version * DSS_BLOCK_SIZE; | |
126 | |||
127 | 2 | ret = dss_read_metadata_string(s, DSS_HEAD_OFFSET_AUTHOR, | |
128 | DSS_AUTHOR_SIZE, "author"); | ||
129 |
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2 | if (ret) |
130 | ✗ | return ret; | |
131 | |||
132 | 2 | ret = dss_read_metadata_date(s, DSS_HEAD_OFFSET_END_TIME, "date"); | |
133 |
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2 | if (ret) |
134 | ✗ | return ret; | |
135 | |||
136 | 2 | ret = dss_read_metadata_string(s, DSS_HEAD_OFFSET_COMMENT, | |
137 | DSS_COMMENT_SIZE, "comment"); | ||
138 |
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2 | if (ret) |
139 | ✗ | return ret; | |
140 | |||
141 | 2 | avio_seek(pb, DSS_HEAD_OFFSET_ACODEC, SEEK_SET); | |
142 | 2 | ctx->audio_codec = avio_r8(pb); | |
143 | |||
144 |
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2 | if (ctx->audio_codec == DSS_ACODEC_DSS_SP) { |
145 | 1 | st->codecpar->codec_id = AV_CODEC_ID_DSS_SP; | |
146 | 1 | st->codecpar->sample_rate = 11025; | |
147 | 1 | s->bit_rate = 8 * (DSS_FRAME_SIZE - 1) * st->codecpar->sample_rate | |
148 | 1 | * 512 / (506 * 264); | |
149 |
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1 | } else if (ctx->audio_codec == DSS_ACODEC_G723_1) { |
150 | 1 | st->codecpar->codec_id = AV_CODEC_ID_G723_1; | |
151 | 1 | st->codecpar->sample_rate = 8000; | |
152 | } else { | ||
153 | ✗ | avpriv_request_sample(s, "Support for codec %x in DSS", | |
154 | ctx->audio_codec); | ||
155 | ✗ | return AVERROR_PATCHWELCOME; | |
156 | } | ||
157 | |||
158 | 2 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
159 | 2 | st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
160 | |||
161 | 2 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); | |
162 | 2 | st->start_time = 0; | |
163 | |||
164 | /* Jump over header */ | ||
165 | |||
166 |
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2 | if (avio_seek(pb, ctx->dss_header_size, SEEK_SET) != ctx->dss_header_size) |
167 | ✗ | return AVERROR(EIO); | |
168 | |||
169 | 2 | ctx->counter = 0; | |
170 | 2 | ctx->swap = 0; | |
171 | |||
172 | 2 | return 0; | |
173 | } | ||
174 | |||
175 | 8 | static void dss_skip_audio_header(AVFormatContext *s, AVPacket *pkt) | |
176 | { | ||
177 | 8 | DSSDemuxContext *ctx = s->priv_data; | |
178 | 8 | AVIOContext *pb = s->pb; | |
179 | |||
180 | 8 | avio_skip(pb, DSS_AUDIO_BLOCK_HEADER_SIZE); | |
181 | 8 | ctx->counter += DSS_BLOCK_SIZE - DSS_AUDIO_BLOCK_HEADER_SIZE; | |
182 | 8 | } | |
183 | |||
184 | 50 | static void dss_sp_byte_swap(DSSDemuxContext *ctx, uint8_t *data) | |
185 | { | ||
186 | int i; | ||
187 | |||
188 |
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50 | if (ctx->swap) { |
189 |
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525 | for (i = 0; i < DSS_FRAME_SIZE - 2; i += 2) |
190 | 500 | data[i] = data[i + 4]; | |
191 | |||
192 | /* Zero the padding. */ | ||
193 | 25 | data[DSS_FRAME_SIZE] = 0; | |
194 | 25 | data[1] = ctx->dss_sp_swap_byte; | |
195 | } else { | ||
196 | 25 | ctx->dss_sp_swap_byte = data[DSS_FRAME_SIZE - 2]; | |
197 | } | ||
198 | |||
199 | /* make sure byte 40 is always 0 */ | ||
200 | 50 | data[DSS_FRAME_SIZE - 2] = 0; | |
201 | 50 | ctx->swap ^= 1; | |
202 | 50 | } | |
203 | |||
204 | 50 | static int dss_sp_read_packet(AVFormatContext *s, AVPacket *pkt) | |
205 | { | ||
206 | 50 | DSSDemuxContext *ctx = s->priv_data; | |
207 | 50 | int read_size, ret, offset = 0, buff_offset = 0; | |
208 | 50 | int64_t pos = avio_tell(s->pb); | |
209 | |||
210 |
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50 | if (ctx->counter == 0) |
211 | 2 | dss_skip_audio_header(s, pkt); | |
212 | |||
213 |
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50 | if (ctx->swap) { |
214 | 25 | read_size = DSS_FRAME_SIZE - 2; | |
215 | 25 | buff_offset = 3; | |
216 | } else | ||
217 | 25 | read_size = DSS_FRAME_SIZE; | |
218 | |||
219 | 50 | ret = av_new_packet(pkt, DSS_FRAME_SIZE); | |
220 |
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50 | if (ret < 0) |
221 | ✗ | return ret; | |
222 | |||
223 | 50 | pkt->duration = 264; | |
224 | 50 | pkt->pos = pos; | |
225 | 50 | pkt->stream_index = 0; | |
226 | |||
227 |
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50 | if (ctx->counter < read_size) { |
228 | 3 | ret = avio_read(s->pb, pkt->data + buff_offset, | |
229 | ctx->counter); | ||
230 |
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3 | if (ret < ctx->counter) |
231 | ✗ | goto error_eof; | |
232 | |||
233 | 3 | offset = ctx->counter; | |
234 | 3 | dss_skip_audio_header(s, pkt); | |
235 | } | ||
236 | 50 | ctx->counter -= read_size; | |
237 | |||
238 | /* This will write one byte into pkt's padding if buff_offset == 3 */ | ||
239 | 50 | ret = avio_read(s->pb, pkt->data + offset + buff_offset, | |
240 | read_size - offset); | ||
241 |
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50 | if (ret < read_size - offset) |
242 | ✗ | goto error_eof; | |
243 | |||
244 | 50 | dss_sp_byte_swap(ctx, pkt->data); | |
245 | |||
246 |
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50 | if (ctx->dss_sp_swap_byte < 0) { |
247 | ✗ | return AVERROR(EAGAIN); | |
248 | } | ||
249 | |||
250 | 50 | return 0; | |
251 | |||
252 | ✗ | error_eof: | |
253 | ✗ | return ret < 0 ? ret : AVERROR_EOF; | |
254 | } | ||
255 | |||
256 | 50 | static int dss_723_1_read_packet(AVFormatContext *s, AVPacket *pkt) | |
257 | { | ||
258 | 50 | DSSDemuxContext *ctx = s->priv_data; | |
259 | 50 | AVStream *st = s->streams[0]; | |
260 | int size, byte, ret, offset; | ||
261 | 50 | int64_t pos = avio_tell(s->pb); | |
262 | |||
263 |
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50 | if (ctx->counter == 0) |
264 | 1 | dss_skip_audio_header(s, pkt); | |
265 | |||
266 | /* We make one byte-step here. Don't forget to add offset. */ | ||
267 | 50 | byte = avio_r8(s->pb); | |
268 |
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50 | if (byte == 0xff) |
269 | ✗ | return AVERROR_INVALIDDATA; | |
270 | |||
271 | 50 | size = frame_size[byte & 3]; | |
272 | |||
273 | 50 | ctx->packet_size = size; | |
274 | 50 | ctx->counter--; | |
275 | |||
276 | 50 | ret = av_new_packet(pkt, size); | |
277 |
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50 | if (ret < 0) |
278 | ✗ | return ret; | |
279 | 50 | pkt->pos = pos; | |
280 | |||
281 | 50 | pkt->data[0] = byte; | |
282 | 50 | offset = 1; | |
283 | 50 | pkt->duration = 240; | |
284 | 50 | s->bit_rate = 8LL * size-- * st->codecpar->sample_rate * 512 / (506 * pkt->duration); | |
285 | |||
286 | 50 | pkt->stream_index = 0; | |
287 | |||
288 |
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50 | if (ctx->counter < size) { |
289 | 2 | ret = avio_read(s->pb, pkt->data + offset, | |
290 | ctx->counter); | ||
291 |
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2 | if (ret < ctx->counter) |
292 | ✗ | return ret < 0 ? ret : AVERROR_EOF; | |
293 | |||
294 | 2 | offset += ctx->counter; | |
295 | 2 | size -= ctx->counter; | |
296 | 2 | ctx->counter = 0; | |
297 | 2 | dss_skip_audio_header(s, pkt); | |
298 | } | ||
299 | 50 | ctx->counter -= size; | |
300 | |||
301 | 50 | ret = avio_read(s->pb, pkt->data + offset, size); | |
302 |
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50 | if (ret < size) |
303 | ✗ | return ret < 0 ? ret : AVERROR_EOF; | |
304 | |||
305 | 50 | return 0; | |
306 | } | ||
307 | |||
308 | 100 | static int dss_read_packet(AVFormatContext *s, AVPacket *pkt) | |
309 | { | ||
310 | 100 | DSSDemuxContext *ctx = s->priv_data; | |
311 | |||
312 |
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100 | if (ctx->audio_codec == DSS_ACODEC_DSS_SP) |
313 | 50 | return dss_sp_read_packet(s, pkt); | |
314 | else | ||
315 | 50 | return dss_723_1_read_packet(s, pkt); | |
316 | } | ||
317 | |||
318 | ✗ | static int dss_read_seek(AVFormatContext *s, int stream_index, | |
319 | int64_t timestamp, int flags) | ||
320 | { | ||
321 | ✗ | DSSDemuxContext *ctx = s->priv_data; | |
322 | int64_t ret, seekto; | ||
323 | uint8_t header[DSS_AUDIO_BLOCK_HEADER_SIZE]; | ||
324 | int offset; | ||
325 | |||
326 | ✗ | if (ctx->audio_codec == DSS_ACODEC_DSS_SP) | |
327 | ✗ | seekto = timestamp / 264 * 41 / 506 * 512; | |
328 | else | ||
329 | ✗ | seekto = timestamp / 240 * ctx->packet_size / 506 * 512; | |
330 | |||
331 | ✗ | if (seekto < 0) | |
332 | ✗ | seekto = 0; | |
333 | |||
334 | ✗ | seekto += ctx->dss_header_size; | |
335 | |||
336 | ✗ | ret = avio_seek(s->pb, seekto, SEEK_SET); | |
337 | ✗ | if (ret < 0) | |
338 | ✗ | return ret; | |
339 | |||
340 | ✗ | avio_read(s->pb, header, DSS_AUDIO_BLOCK_HEADER_SIZE); | |
341 | ✗ | ctx->swap = !!(header[0] & 0x80); | |
342 | ✗ | offset = 2*header[1] + 2*ctx->swap; | |
343 | ✗ | if (offset < DSS_AUDIO_BLOCK_HEADER_SIZE) | |
344 | ✗ | return AVERROR_INVALIDDATA; | |
345 | ✗ | if (offset == DSS_AUDIO_BLOCK_HEADER_SIZE) { | |
346 | ✗ | ctx->counter = 0; | |
347 | ✗ | offset = avio_skip(s->pb, -DSS_AUDIO_BLOCK_HEADER_SIZE); | |
348 | } else { | ||
349 | ✗ | ctx->counter = DSS_BLOCK_SIZE - offset; | |
350 | ✗ | offset = avio_skip(s->pb, offset - DSS_AUDIO_BLOCK_HEADER_SIZE); | |
351 | } | ||
352 | ✗ | ctx->dss_sp_swap_byte = -1; | |
353 | ✗ | return 0; | |
354 | } | ||
355 | |||
356 | |||
357 | const FFInputFormat ff_dss_demuxer = { | ||
358 | .p.name = "dss", | ||
359 | .p.long_name = NULL_IF_CONFIG_SMALL("Digital Speech Standard (DSS)"), | ||
360 | .p.extensions = "dss", | ||
361 | .priv_data_size = sizeof(DSSDemuxContext), | ||
362 | .read_probe = dss_probe, | ||
363 | .read_header = dss_read_header, | ||
364 | .read_packet = dss_read_packet, | ||
365 | .read_seek = dss_read_seek, | ||
366 | }; | ||
367 |