3 * Copyright (c) 2009 Daniel Verkamp <daniel at drv.nu>
5 * This file is part of FFmpeg.
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.
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.
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
24 * @brief Vivo stream demuxer
25 * @author Daniel Verkamp <daniel at drv.nu>
26 * @sa http://wiki.multimedia.cx/index.php?title=Vivo
29 #include "libavutil/parseutils.h"
33 typedef struct VivoContext {
40 uint8_t text[1024 + 1];
43 static int vivo_probe(AVProbeData *p)
45 const unsigned char *buf = p->buf;
46 unsigned c, length = 0;
48 // stream must start with packet of type 0 and sequence number 0
52 // read at most 2 bytes of coded length
57 length = (length << 7) | (c & 0x7F);
59 if (c & 0x80 || length > 1024 || length < 21)
62 if (memcmp(buf, "\r\nVersion:Vivo/", 15))
66 if (*buf < '0' && *buf > '2')
69 return AVPROBE_SCORE_MAX;
72 static int vivo_get_packet_header(AVFormatContext *s)
74 VivoContext *vivo = s->priv_data;
75 AVIOContext *pb = s->pb;
76 unsigned c, get_length = 0;
88 vivo->sequence = c & 0xF;
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;
97 av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
98 return AVERROR_INVALIDDATA;
103 vivo->length = c & 0x7F;
106 vivo->length = (vivo->length << 7) | (c & 0x7F);
109 av_log(s, AV_LOG_ERROR, "coded length is more than two bytes\n");
110 return AVERROR_INVALIDDATA;
118 static int vivo_read_header(AVFormatContext *s)
120 VivoContext *vivo = s->priv_data;
121 AVRational fps = { 1, 25};
123 unsigned char *line, *line_end, *key, *value;
126 int64_t duration = 0;
129 vst = avformat_new_stream(s, NULL);
130 ast = avformat_new_stream(s, NULL);
132 return AVERROR(ENOMEM);
134 ast->codec->sample_rate = 8000;
137 if ((ret = vivo_get_packet_header(s)) < 0)
140 // done reading all text header packets?
141 if (vivo->sequence || vivo->type)
144 if (vivo->length <= 1024) {
145 avio_read(s->pb, vivo->text, vivo->length);
146 vivo->text[vivo->length] = 0;
148 av_log(s, AV_LOG_WARNING, "too big header, skipping\n");
149 avio_skip(s->pb, vivo->length);
155 line_end = strstr(line, "\r\n");
161 line = line_end + 2; // skip \r\n
163 if (line_end == key) // skip blank lines
166 value = strchr(key, ':');
168 av_log(s, AV_LOG_WARNING, "missing colon in key:value pair '%s'\n",
175 av_log(s, AV_LOG_DEBUG, "header: '%s' = '%s'\n", key, value);
177 value_int = strtol(value, &end_value, 10);
179 if (*end_value == 0) { // valid integer
180 av_log(s, AV_LOG_DEBUG, "got a valid integer (%ld)\n", value_int);
182 if (!strcmp(key, "Duration")) {
183 duration = value_int;
184 } else if (!strcmp(key, "Width")) {
185 vst->codec->width = value_int;
186 } else if (!strcmp(key, "Height")) {
187 vst->codec->height = value_int;
188 } else if (!strcmp(key, "TimeUnitNumerator")) {
189 fps.num = value_int / 1000;
190 } else if (!strcmp(key, "TimeUnitDenominator")) {
192 } else if (!strcmp(key, "SamplingFrequency")) {
193 ast->codec->sample_rate = value_int;
194 } else if (!strcmp(key, "NominalBitrate")) {
195 } else if (!strcmp(key, "Length")) {
202 if (!strcmp(key, "Version")) {
203 if (sscanf(value, "Vivo/%d.", &vivo->version) != 1)
204 return AVERROR_INVALIDDATA;
206 } else if (!strcmp(key, "FPS")) {
210 if (!av_parse_ratio(&tmp, value, 10000, AV_LOG_WARNING, s))
215 av_dict_set(&s->metadata, key, value, 0);
219 avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
220 avpriv_set_pts_info(vst, 64, fps.num, fps.den);
222 s->duration = av_rescale(duration, 1000, 1);
225 vst->codec->codec_tag = 0;
226 vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
228 if (vivo->version == 1) {
229 vst->codec->codec_id = AV_CODEC_ID_H263;
230 ast->codec->codec_id = AV_CODEC_ID_G723_1;
231 ast->codec->bits_per_coded_sample = 8;
232 ast->codec->block_align = 24;
233 ast->codec->bit_rate = 6400;
237 ast->codec->codec_tag = 0;
238 ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
239 ast->codec->channels = 1;
244 static int vivo_read_packet(AVFormatContext *s, AVPacket *pkt)
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;
256 switch (vivo->type) {
258 avio_skip(pb, vivo->length);
259 if ((ret = vivo_get_packet_header(s)) < 0)
271 av_log(s, AV_LOG_ERROR, "unknown packet type %d\n", vivo->type);
272 return AVERROR_INVALIDDATA;
275 if ((ret = av_get_packet(pb, pkt, vivo->length)) < 0)
278 // get next packet header
279 if ((ret = vivo_get_packet_header(s)) < 0)
282 while (vivo->sequence == old_sequence &&
283 (((vivo->type - 1) >> 1) == ((old_type - 1) >> 1))) {
289 if ((ret = av_append_packet(pb, pkt, vivo->length)) < 0)
292 // get next packet header
293 if ((ret = vivo_get_packet_header(s)) < 0)
297 pkt->stream_index = stream_index;
305 AVInputFormat ff_vivo_demuxer = {
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,