1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/******************************************************************************
* skeleton.c *
* author: Tahseen Mohammad *
*******************************************************************************
* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
* are met: *
* *
* - Redistributions of source code must retain the above copyright *
* notice, this list of conditions and the following disclaimer. *
* *
* - Redistributions in binary form must reproduce the above copyright *
* notice, this list of conditions and the following disclaimer in the *
* documentation and/or other materials provided with the distribution. *
* *
* - Neither the name of the Xiph.org Foundation nor the names of its *
* contributors may be used to endorse or promote products derived from *
* this software without specific prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT *
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR *
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR *
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, *
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, *
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR *
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF *
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING *
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS *
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
******************************************************************************/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ogg/ogg.h>
#include <skeleton.h>
/* write an ogg_page to a file pointer */
int write_ogg_page_to_file(ogg_page *og, FILE *out) {
int written;
written = fwrite(og->header,1, og->header_len, out);
written += fwrite(og->body,1, og->body_len, out);
return written;
}
int add_message_header_field(fisbone_packet *fp,
char *header_key,
char *header_value) {
/* size of both key and value + ': ' + CRLF */
int this_message_size = strlen(header_key) + strlen(header_value) + 4;
if (fp->message_header_fields == NULL) {
fp->message_header_fields = _ogg_calloc(this_message_size, sizeof(char));
} else {
int new_size = (fp->current_header_size + this_message_size) * sizeof(char);
fp->message_header_fields = _ogg_realloc(fp->message_header_fields, new_size);
}
snprintf(fp->message_header_fields + fp->current_header_size,
this_message_size+1,
"%s: %s\r\n",
header_key,
header_value);
fp->current_header_size += this_message_size;
return 0;
}
/* create a ogg_packet from a fishead_packet structure */
ogg_packet ogg_from_fishead(fishead_packet *fp) {
ogg_packet op;
memset(&op, 0, sizeof(op));
op.packet = _ogg_calloc(FISHEAD_SIZE, sizeof(unsigned char));
memset(op.packet, 0, FISHEAD_SIZE);
memcpy (op.packet, FISHEAD_IDENTIFIER, 8); /* identifier */
*((ogg_uint16_t*)(op.packet+8)) = SKELETON_VERSION_MAJOR; /* version major */
*((ogg_uint16_t*)(op.packet+10)) = SKELETON_VERSION_MINOR; /* version minor */
*((ogg_int64_t*)(op.packet+12)) = (ogg_int64_t)fp->ptime_n; /* presentationtime numerator */
*((ogg_int64_t*)(op.packet+20)) = (ogg_int64_t)fp->ptime_d; /* presentationtime denominator */
*((ogg_int64_t*)(op.packet+28)) = (ogg_int64_t)fp->btime_n; /* basetime numerator */
*((ogg_int64_t*)(op.packet+36)) = (ogg_int64_t)fp->btime_d; /* basetime denominator */
/* TODO: UTC time, set to zero for now */
op.b_o_s = 1; /* its the first packet of the stream */
op.e_o_s = 0; /* its not the last packet of the stream */
op.bytes = FISHEAD_SIZE; /* length of the packet in bytes */
return op;
}
/* create a ogg_packet from a fisbone_packet structure.
* call this method after the fisbone_packet is filled and all message header fields are added
* by calling add_message_header_field method.
*/
ogg_packet ogg_from_fisbone(fisbone_packet *fp) {
ogg_packet op;
int packet_size = FISBONE_SIZE + fp->current_header_size;
memset (&op, 0, sizeof (op));
op.packet = _ogg_calloc (packet_size, sizeof(unsigned char));
memset (op.packet, 0, packet_size);
memcpy (op.packet, FISBONE_IDENTIFIER, 8); /* identifier */
*((ogg_uint32_t*)(op.packet+8)) = FISBONE_MESSAGE_HEADER_OFFSET; /* offset of the message header fields */
*((ogg_uint32_t*)(op.packet+12)) = fp->serial_no; /* serialno of the respective stream */
*((ogg_uint32_t*)(op.packet+16)) = fp->nr_header_packet; /* number of header packets */
*((ogg_int64_t*)(op.packet+20)) = fp->granule_rate_n; /* granulrate numerator */
*((ogg_int64_t*)(op.packet+28)) = fp->granule_rate_d; /* granulrate denominator */
*((ogg_int64_t*)(op.packet+36)) = fp->start_granule; /* start granule */
*((ogg_uint32_t*)(op.packet+44)) = fp->preroll; /* preroll, for theora its 0 */
*(op.packet+48) = fp->granule_shift; /* granule shift */
memcpy((op.packet+FISBONE_SIZE), fp->message_header_fields, fp->current_header_size);
op.b_o_s = 0;
op.e_o_s = 0;
op.bytes = packet_size; /* size of the packet in bytes */
return op;
}
/* fills up a fishead_packet from a fishead ogg_packet of a skeleton bistream */
fishead_packet fishead_from_ogg(ogg_packet *op) {
fishead_packet fp;
if (memcmp(op->packet, FISHEAD_IDENTIFIER, 8))
; /* invalid packet what do we do? */
fp.version_major = *((ogg_uint16_t*)(op->packet+8)); /* version major */
fp.version_minor = *((ogg_uint16_t*)(op->packet+10)); /* version minor */
fp.ptime_n = *((ogg_int64_t*)(op->packet+12)); /* presentationtime numerator */
fp.ptime_d = *((ogg_int64_t*)(op->packet+20)); /* presentationtime denominator */
fp.btime_n = *((ogg_int64_t*)(op->packet+28)); /* basetime numerator */
fp.btime_d = *((ogg_int64_t*)(op->packet+36)); /* basetime denominator */
memcpy(fp.UTC, op->packet+44, 20);
return fp;
}
/* fills up a fisbone_packet from a fisbone ogg_packet of a skeleton bitstream */
fisbone_packet fisbone_from_ogg(ogg_packet *op) {
fisbone_packet fp;
if (memcmp(op->packet, FISBONE_IDENTIFIER, 8))
; /* invalid value, what do we do? */
fp.serial_no = *((ogg_uint32_t*)(op->packet+12)); /* serialno of the stream represented by this fisbone packet */
fp.nr_header_packet = *((ogg_uint32_t*)(op->packet+16)); /* number of header packets */
fp.granule_rate_n = *((ogg_int64_t*)(op->packet+20)); /* granulrate numerator */
fp.granule_rate_d = *((ogg_int64_t*)(op->packet+28)); /* granulrate denominator */
fp.start_granule = *((ogg_int64_t*)(op->packet+36)); /* start granule */
fp.preroll = *((ogg_uint32_t*)(op->packet+44)); /* preroll, for theora its 0 */
fp.granule_shift = *(op->packet+48); /* granule shift */
fp.current_header_size = op->bytes - FISBONE_SIZE;
fp.message_header_fields = _ogg_calloc(fp.current_header_size+1, sizeof(char));
memcpy(fp.message_header_fields, op->packet+FISBONE_SIZE, fp.current_header_size);
return fp;
}
int add_fishead_to_stream(ogg_stream_state *os, fishead_packet *fp) {
ogg_packet op;
op = ogg_from_fishead(fp);
ogg_stream_packetin(os, &op);
_ogg_free(op.packet);
return 0;
}
int add_fisbone_to_stream(ogg_stream_state *os, fisbone_packet *fp) {
ogg_packet op;
op = ogg_from_fisbone(fp);
ogg_stream_packetin(os, &op);
_ogg_free(op.packet);
return 0;
}
int add_eos_packet_to_stream(ogg_stream_state *os) {
ogg_packet op;
memset (&op, 0, sizeof(op));
op.e_o_s = 1;
ogg_stream_packetin(os, &op);
return 0;
}
int flush_ogg_stream_to_file(ogg_stream_state *os, FILE *out) {
ogg_page og;
int result;
while((result = ogg_stream_flush(os, &og)))
{
if(!result) break;
result = write_ogg_page_to_file(&og, out);
if(result != og.header_len + og.body_len)
return 1;
}
return 0;
}
|
