1 /*
2 * Vivo stream demuxer
3 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
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 /**
23 * @file
24 * @brief Vivo stream demuxer
25 * @author Daniel Verkamp <daniel at drv.nu>
26 * @sa http://wiki.multimedia.cx/index.php?title=Vivo
27 */
28
29 #include "libavutil/parseutils.h"
30 #include "avformat.h"
31 #include "internal.h"
32
33 typedef struct VivoContext {
34 int version;
35
36 int type;
37 int sequence;
38 int length;
39 int duration;
40
41 uint8_t text[1024 + 1];
42 } VivoContext;
43
vivo_probe(const AVProbeData * p)44 static int vivo_probe(const AVProbeData *p)
45 {
46 const unsigned char *buf = p->buf;
47 unsigned c, length = 0;
48
49 // stream must start with packet of type 0 and sequence number 0
50 if (*buf++ != 0)
51 return 0;
52
53 // read at most 2 bytes of coded length
54 c = *buf++;
55 length = c & 0x7F;
56 if (c & 0x80) {
57 c = *buf++;
58 length = (length << 7) | (c & 0x7F);
59 }
60 if (c & 0x80 || length > 1024 || length < 21)
61 return 0;
62
63 buf += 2;
64 if (memcmp(buf, "Version:Vivo/", 13))
65 return 0;
66 buf += 13;
67
68 if (*buf < '0' || *buf > '2')
69 return 0;
70
71 return AVPROBE_SCORE_MAX;
72 }
73
vivo_get_packet_header(AVFormatContext * s)74 static int vivo_get_packet_header(AVFormatContext *s)
75 {
76 VivoContext *vivo = s->priv_data;
77 AVIOContext *pb = s->pb;
78 unsigned c, get_length = 0;
79
80 if (avio_feof(pb))
81 return AVERROR_EOF;
82
83 c = avio_r8(pb);
84 if (c == 0x82) {
85 get_length = 1;
86 c = avio_r8(pb);
87 }
88
89 vivo->type = c >> 4;
90 vivo->sequence = c & 0xF;
91
92 switch (vivo->type) {
93 case 0: get_length = 1; break;
94 case 1: vivo->length = 128; break;
95 case 2: get_length = 1; break;
96 case 3: vivo->length = 40; break;
97 case 4: vivo->length = 24; break;
98 default:
99 av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
100 return AVERROR_INVALIDDATA;
101 }
102
103 if (get_length) {
104 c = avio_r8(pb);
105 vivo->length = c & 0x7F;
106 if (c & 0x80) {
107 c = avio_r8(pb);
108 vivo->length = (vivo->length << 7) | (c & 0x7F);
109
110 if (c & 0x80) {
111 av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n");
112 return AVERROR_INVALIDDATA;
113 }
114 }
115 }
116
117 return 0;
118 }
119
vivo_read_header(AVFormatContext * s)120 static int vivo_read_header(AVFormatContext *s)
121 {
122 VivoContext *vivo = s->priv_data;
123 AVRational fps = { 1, 25};
124 AVStream *ast, *vst;
125 unsigned char *line, *line_end, *key, *value;
126 long value_int;
127 int ret, value_used;
128 int64_t duration = 0;
129 char *end_value;
130
131 vst = avformat_new_stream(s, NULL);
132 ast = avformat_new_stream(s, NULL);
133 if (!ast || !vst)
134 return AVERROR(ENOMEM);
135
136 ast->codecpar->sample_rate = 8000;
137
138 while (1) {
139 if ((ret = vivo_get_packet_header(s)) < 0)
140 return ret;
141
142 // done reading all text header packets?
143 if (vivo->sequence || vivo->type)
144 break;
145
146 if (vivo->length <= 1024) {
147 avio_read(s->pb, vivo->text, vivo->length);
148 vivo->text[vivo->length] = 0;
149 } else {
150 av_log(s, AV_LOG_WARNING, "too big header, skipping\n");
151 avio_skip(s->pb, vivo->length);
152 continue;
153 }
154
155 line = vivo->text;
156 while (*line) {
157 line_end = strstr(line, "\r\n");
158 if (!line_end)
159 break;
160
161 *line_end = 0;
162 key = line;
163 line = line_end + 2; // skip \r\n
164
165 if (line_end == key) // skip blank lines
166 continue;
167
168 value = strchr(key, ':');
169 if (!value) {
170 av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n",
171 key);
172 continue;
173 }
174
175 *value++ = 0;
176
177 av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value);
178
179 value_int = strtol(value, &end_value, 10);
180 value_used = 0;
181 if (*end_value == 0) { // valid integer
182 av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int);
183 value_used = 1;
184 if (!strcmp(key, "Duration")) {
185 duration = value_int;
186 } else if (!strcmp(key, "Width")) {
187 vst->codecpar->width = value_int;
188 } else if (!strcmp(key, "Height")) {
189 vst->codecpar->height = value_int;
190 } else if (!strcmp(key, "TimeUnitNumerator")) {
191 fps.num = value_int / 1000;
192 } else if (!strcmp(key, "TimeUnitDenominator")) {
193 fps.den = value_int;
194 } else if (!strcmp(key, "SamplingFrequency")) {
195 ast->codecpar->sample_rate = value_int;
196 } else if (!strcmp(key, "NominalBitrate")) {
197 } else if (!strcmp(key, "Length")) {
198 // size of file
199 } else {
200 value_used = 0;
201 }
202 }
203
204 if (!strcmp(key, "Version")) {
205 if (sscanf(value, "Vivo/%d.", &vivo->version) != 1)
206 return AVERROR_INVALIDDATA;
207 value_used = 1;
208 } else if (!strcmp(key, "FPS")) {
209 AVRational tmp;
210
211 value_used = 1;
212 if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s))
213 fps = av_inv_q(tmp);
214 }
215
216 if (!value_used)
217 av_dict_set(&s->metadata, key, value, 0);
218 }
219 }
220
221 avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
222 avpriv_set_pts_info(vst, 64, fps.num, fps.den);
223 if (duration)
224 s->duration = av_rescale(duration, 1000, 1);
225
226 vst->start_time = 0;
227 vst->codecpar->codec_tag = 0;
228 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
229
230 if (vivo->version == 1) {
231 vst->codecpar->codec_id = AV_CODEC_ID_H263;
232 ast->codecpar->codec_id = AV_CODEC_ID_G723_1;
233 ast->codecpar->bits_per_coded_sample = 8;
234 ast->codecpar->block_align = 24;
235 ast->codecpar->bit_rate = 6400;
236 } else {
237 ast->codecpar->codec_id = AV_CODEC_ID_SIREN;
238 ast->codecpar->bits_per_coded_sample = 16;
239 ast->codecpar->block_align = 40;
240 ast->codecpar->bit_rate = 6400;
241 vivo->duration = 320;
242 }
243
244 ast->start_time = 0;
245 ast->codecpar->codec_tag = 0;
246 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
247 ast->codecpar->channels = 1;
248
249 return 0;
250 }
251
vivo_read_packet(AVFormatContext * s,AVPacket * pkt)252 static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt)
253 {
254 VivoContext *vivo = s->priv_data;
255 AVIOContext *pb = s->pb;
256 unsigned old_sequence = vivo->sequence, old_type = vivo->type;
257 int stream_index, duration, ret = 0;
258
259 restart:
260
261 if (avio_feof(pb))
262 return AVERROR_EOF;
263
264 switch (vivo->type) {
265 case 0:
266 avio_skip(pb, vivo->length);
267 if ((ret = vivo_get_packet_header(s)) < 0)
268 return ret;
269 goto restart;
270 case 1:
271 case 2: // video
272 stream_index = 0;
273 duration = 1;
274 break;
275 case 3:
276 case 4: // audio
277 stream_index = 1;
278 duration = vivo->duration;
279 break;
280 default:
281 av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
282 return AVERROR_INVALIDDATA;
283 }
284
285 if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0)
286 return ret;
287
288 // get next packet header
289 if ((ret = vivo_get_packet_header(s)) < 0)
290 return ret;
291
292 while (vivo->sequence == old_sequence &&
293 (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) {
294 if (avio_feof(pb)) {
295 return AVERROR_EOF;
296 }
297
298 if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0)
299 return ret;
300
301 // get next packet header
302 if ((ret = vivo_get_packet_header(s)) < 0)
303 return ret;
304 }
305
306 pkt->stream_index = stream_index;
307 pkt->duration = duration;
308
309 return ret;
310 }
311
312 AVInputFormat ff_vivo_demuxer = {
313 .name = "vivo",
314 .long_name = NULL_IF_CONFIG_SMALL("Vivo"),
315 .priv_data_size = sizeof(VivoContext),
316 .read_probe = vivo_probe,
317 .read_header = vivo_read_header,
318 .read_packet = vivo_read_packet,
319 .extensions = "viv",
320 };
321