blob: c9e9c37f37dfbede0a94504c8fe025cc5c135984
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 | |
40 | uint8_t text[1024 + 1]; |
41 | } VivoContext; |
42 | |
43 | static int vivo_probe(AVProbeData *p) |
44 | { |
45 | const unsigned char *buf = p->buf; |
46 | unsigned c, length = 0; |
47 | |
48 | // stream must start with packet of type 0 and sequence number 0 |
49 | if (*buf++ != 0) |
50 | return 0; |
51 | |
52 | // read at most 2 bytes of coded length |
53 | c = *buf++; |
54 | length = c & 0x7F; |
55 | if (c & 0x80) { |
56 | c = *buf++; |
57 | length = (length << 7) | (c & 0x7F); |
58 | } |
59 | if (c & 0x80 || length > 1024 || length < 21) |
60 | return 0; |
61 | |
62 | if (memcmp(buf, "\r\nVersion:Vivo/", 15)) |
63 | return 0; |
64 | buf += 15; |
65 | |
66 | if (*buf < '0' || *buf > '2') |
67 | return 0; |
68 | |
69 | return AVPROBE_SCORE_MAX; |
70 | } |
71 | |
72 | static int vivo_get_packet_header(AVFormatContext *s) |
73 | { |
74 | VivoContext *vivo = s->priv_data; |
75 | AVIOContext *pb = s->pb; |
76 | unsigned c, get_length = 0; |
77 | |
78 | if (avio_feof(pb)) |
79 | return AVERROR_EOF; |
80 | |
81 | c = avio_r8(pb); |
82 | if (c == 0x82) { |
83 | get_length = 1; |
84 | c = avio_r8(pb); |
85 | } |
86 | |
87 | vivo->type = c >> 4; |
88 | vivo->sequence = c & 0xF; |
89 | |
90 | switch (vivo->type) { |
91 | case 0: get_length = 1; break; |
92 | case 1: vivo->length = 128; break; |
93 | case 2: get_length = 1; break; |
94 | case 3: vivo->length = 40; break; |
95 | case 4: vivo->length = 24; break; |
96 | default: |
97 | av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type); |
98 | return AVERROR_INVALIDDATA; |
99 | } |
100 | |
101 | if (get_length) { |
102 | c = avio_r8(pb); |
103 | vivo->length = c & 0x7F; |
104 | if (c & 0x80) { |
105 | c = avio_r8(pb); |
106 | vivo->length = (vivo->length << 7) | (c & 0x7F); |
107 | |
108 | if (c & 0x80) { |
109 | av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n"); |
110 | return AVERROR_INVALIDDATA; |
111 | } |
112 | } |
113 | } |
114 | |
115 | return 0; |
116 | } |
117 | |
118 | static int vivo_read_header(AVFormatContext *s) |
119 | { |
120 | VivoContext *vivo = s->priv_data; |
121 | AVRational fps = { 1, 25}; |
122 | AVStream *ast, *vst; |
123 | unsigned char *line, *line_end, *key, *value; |
124 | long value_int; |
125 | int ret, value_used; |
126 | int64_t duration = 0; |
127 | char *end_value; |
128 | |
129 | vst = avformat_new_stream(s, NULL); |
130 | ast = avformat_new_stream(s, NULL); |
131 | if (!ast || !vst) |
132 | return AVERROR(ENOMEM); |
133 | |
134 | ast->codecpar->sample_rate = 8000; |
135 | |
136 | while (1) { |
137 | if ((ret = vivo_get_packet_header(s)) < 0) |
138 | return ret; |
139 | |
140 | // done reading all text header packets? |
141 | if (vivo->sequence || vivo->type) |
142 | break; |
143 | |
144 | if (vivo->length <= 1024) { |
145 | avio_read(s->pb, vivo->text, vivo->length); |
146 | vivo->text[vivo->length] = 0; |
147 | } else { |
148 | av_log(s, AV_LOG_WARNING, "too big header, skipping\n"); |
149 | avio_skip(s->pb, vivo->length); |
150 | continue; |
151 | } |
152 | |
153 | line = vivo->text; |
154 | while (*line) { |
155 | line_end = strstr(line, "\r\n"); |
156 | if (!line_end) |
157 | break; |
158 | |
159 | *line_end = 0; |
160 | key = line; |
161 | line = line_end + 2; // skip \r\n |
162 | |
163 | if (line_end == key) // skip blank lines |
164 | continue; |
165 | |
166 | value = strchr(key, ':'); |
167 | if (!value) { |
168 | av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n", |
169 | value); |
170 | continue; |
171 | } |
172 | |
173 | *value++ = 0; |
174 | |
175 | av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value); |
176 | |
177 | value_int = strtol(value, &end_value, 10); |
178 | value_used = 0; |
179 | if (*end_value == 0) { // valid integer |
180 | av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int); |
181 | value_used = 1; |
182 | if (!strcmp(key, "Duration")) { |
183 | duration = value_int; |
184 | } else if (!strcmp(key, "Width")) { |
185 | vst->codecpar->width = value_int; |
186 | } else if (!strcmp(key, "Height")) { |
187 | vst->codecpar->height = value_int; |
188 | } else if (!strcmp(key, "TimeUnitNumerator")) { |
189 | fps.num = value_int / 1000; |
190 | } else if (!strcmp(key, "TimeUnitDenominator")) { |
191 | fps.den = value_int; |
192 | } else if (!strcmp(key, "SamplingFrequency")) { |
193 | ast->codecpar->sample_rate = value_int; |
194 | } else if (!strcmp(key, "NominalBitrate")) { |
195 | } else if (!strcmp(key, "Length")) { |
196 | // size of file |
197 | } else { |
198 | value_used = 0; |
199 | } |
200 | } |
201 | |
202 | if (!strcmp(key, "Version")) { |
203 | if (sscanf(value, "Vivo/%d.", &vivo->version) != 1) |
204 | return AVERROR_INVALIDDATA; |
205 | value_used = 1; |
206 | } else if (!strcmp(key, "FPS")) { |
207 | AVRational tmp; |
208 | |
209 | value_used = 1; |
210 | if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s)) |
211 | fps = av_inv_q(tmp); |
212 | } |
213 | |
214 | if (!value_used) |
215 | av_dict_set(&s->metadata, key, value, 0); |
216 | } |
217 | } |
218 | |
219 | avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate); |
220 | avpriv_set_pts_info(vst, 64, fps.num, fps.den); |
221 | if (duration) |
222 | s->duration = av_rescale(duration, 1000, 1); |
223 | |
224 | vst->start_time = 0; |
225 | vst->codecpar->codec_tag = 0; |
226 | vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
227 | |
228 | if (vivo->version == 1) { |
229 | vst->codecpar->codec_id = AV_CODEC_ID_H263; |
230 | ast->codecpar->codec_id = AV_CODEC_ID_G723_1; |
231 | ast->codecpar->bits_per_coded_sample = 8; |
232 | ast->codecpar->block_align = 24; |
233 | ast->codecpar->bit_rate = 6400; |
234 | } |
235 | |
236 | ast->start_time = 0; |
237 | ast->codecpar->codec_tag = 0; |
238 | ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
239 | ast->codecpar->channels = 1; |
240 | |
241 | return 0; |
242 | } |
243 | |
244 | static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt) |
245 | { |
246 | VivoContext *vivo = s->priv_data; |
247 | AVIOContext *pb = s->pb; |
248 | unsigned old_sequence = vivo->sequence, old_type = vivo->type; |
249 | int stream_index, ret = 0; |
250 | |
251 | restart: |
252 | |
253 | if (avio_feof(pb)) |
254 | return AVERROR_EOF; |
255 | |
256 | switch (vivo->type) { |
257 | case 0: |
258 | avio_skip(pb, vivo->length); |
259 | if ((ret = vivo_get_packet_header(s)) < 0) |
260 | return ret; |
261 | goto restart; |
262 | case 1: |
263 | case 2: // video |
264 | stream_index = 0; |
265 | break; |
266 | case 3: |
267 | case 4: // audio |
268 | stream_index = 1; |
269 | break; |
270 | default: |
271 | av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type); |
272 | return AVERROR_INVALIDDATA; |
273 | } |
274 | |
275 | if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0) |
276 | goto fail; |
277 | |
278 | // get next packet header |
279 | if ((ret = vivo_get_packet_header(s)) < 0) |
280 | goto fail; |
281 | |
282 | while (vivo->sequence == old_sequence && |
283 | (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) { |
284 | if (avio_feof(pb)) { |
285 | ret = AVERROR_EOF; |
286 | break; |
287 | } |
288 | |
289 | if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0) |
290 | break; |
291 | |
292 | // get next packet header |
293 | if ((ret = vivo_get_packet_header(s)) < 0) |
294 | break; |
295 | } |
296 | |
297 | pkt->stream_index = stream_index; |
298 | |
299 | fail: |
300 | if (ret < 0) |
301 | av_packet_unref(pkt); |
302 | return ret; |
303 | } |
304 | |
305 | AVInputFormat ff_vivo_demuxer = { |
306 | .name = "vivo", |
307 | .long_name = NULL_IF_CONFIG_SMALL("Vivo"), |
308 | .priv_data_size = sizeof(VivoContext), |
309 | .read_probe = vivo_probe, |
310 | .read_header = vivo_read_header, |
311 | .read_packet = vivo_read_packet, |
312 | .extensions = "viv", |
313 | }; |
314 |