-
Notifications
You must be signed in to change notification settings - Fork 2
/
p_pcm.cpp
211 lines (186 loc) · 6.24 KB
/
p_pcm.cpp
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
/*
ogmmerge -- utility for splicing together ogg bitstreams
from component media subtypes
p_pcm.cpp
raw & uncompressed PCM output module
Written by Moritz Bunkus <[email protected]>
Based on Xiph.org's 'oggmerge' found in their CVS repository
See http://www.xiph.org
Distributed under the GPL
see the file COPYING for details
or visit http://www.gnu.org/copyleft/gpl.html
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ogg/ogg.h>
#include "ogmmerge.h"
#include "queue.h"
#include "p_pcm.h"
#include "vorbis_header_utils.h"
pcm_packetizer_c::pcm_packetizer_c(unsigned long nsamples_per_sec,
int nchannels, int nbits_per_sample,
audio_sync_t *nasync, range_t *nrange,
char **ncomments) throw (error_c) : q_c() {
serialno = create_unique_serial();
ogg_stream_init(&os, serialno);
packetno = 0;
bps = nchannels * nbits_per_sample * nsamples_per_sec / 8;
tempbuf = (char *)malloc(bps + 128);
if (tempbuf == NULL)
die("malloc");
samples_per_sec = nsamples_per_sec;
channels = nchannels;
bits_per_sample = nbits_per_sample;
bytes_output = 0;
memcpy(&async, nasync, sizeof(audio_sync_t));
memcpy(&range, nrange, sizeof(range_t));
comments = generate_vorbis_comment(ncomments);
old_granulepos = 0;
}
pcm_packetizer_c::~pcm_packetizer_c() {
ogg_stream_clear(&os);
if (tempbuf != NULL)
free(tempbuf);
if (comments != NULL) {
vorbis_comment_clear(comments);
free(comments);
}
}
void pcm_packetizer_c::reset() {
}
void pcm_packetizer_c::produce_header_packets() {
ogg_packet op;
stream_header sh;
int clen, res;
memset(&sh, 0, sizeof(sh));
strcpy(sh.streamtype, "audio");
memcpy(sh.subtype, "0001", 4);
put_uint32(&sh.size, sizeof(sh));
put_uint64(&sh.time_unit, 10000000);
put_uint64(&sh.samples_per_unit, samples_per_sec);
put_uint32(&sh.default_len, 1);
put_uint32(&sh.buffersize, bps);
put_uint16(&sh.bits_per_sample, bits_per_sample);
put_uint16(&sh.sh.audio.channels, channels);
put_uint16(&sh.sh.audio.blockalign, channels * bits_per_sample / 8);
put_uint32(&sh.sh.audio.avgbytespersec, sh.buffersize);
*((unsigned char *)tempbuf) = PACKET_TYPE_HEADER;
memcpy((char *)&tempbuf[1], &sh, sizeof(sh));
op.packet = (unsigned char *)tempbuf;
op.bytes = 1 + get_uint32(&sh.size);
op.b_o_s = 1;
op.e_o_s = 0;
op.packetno = 0;
op.granulepos = 0;
/* submit it */
ogg_stream_packetin(&os, &op);
packetno++;
flush_pages(PACKET_TYPE_HEADER);
/* Create the comments packet */
clen = -1 * comments_to_buffer(comments, NULL, 0);
op.packet = (unsigned char *)tempbuf;
op.bytes = clen;
op.b_o_s = 0;
op.e_o_s = 0;
op.granulepos = 0;
op.packetno = 1;
if ((res = comments_to_buffer(comments, (char *)op.packet, clen)) < 0) {
fprintf(stderr, "FATAL: p_pcm: comments_to_buffer returned %d, " \
"clen is %d\n", res, clen);
exit(1);
}
ogg_stream_packetin(&os, &op);
flush_pages(PACKET_TYPE_COMMENT);
packetno++;
}
int pcm_packetizer_c::process(char *buf, int size, int last_frame) {
ogg_packet op;
int i;
int start, j;
u_int16_t samp_in_subpacket;
unsigned char *bptr;
int bytes_per_subpacket;
int remaining_bytes;
int complete_subpackets;
if (size > bps) {
fprintf(stderr, "FATAL: pcm_packetizer: size (%d) > bps (%d)\n", size,
bps);
exit(1);
}
if (packetno == 0)
produce_header_packets();
bytes_per_subpacket = bps / pcm_interleave;
complete_subpackets = size / bytes_per_subpacket;
remaining_bytes = size % bytes_per_subpacket;
memcpy(&tempbuf[1 + sizeof(samp_in_subpacket)], buf, size);
for (i = 0; i < complete_subpackets; i++) {
int last_packet = 0;
if (last_frame && (i == (complete_subpackets - 1)) &&
(remaining_bytes == 0))
last_packet = 1;
start = i * bytes_per_subpacket;
samp_in_subpacket = bytes_per_subpacket * 8 / bits_per_sample / channels;
tempbuf[start] = ((sizeof(samp_in_subpacket) & 3) << 6) +
((sizeof(samp_in_subpacket) & 4) >> 1);
tempbuf[start] |= (i == 0 ? PACKET_IS_SYNCPOINT : 0);
op.bytes = bytes_per_subpacket + 1 + sizeof(samp_in_subpacket);
bptr = (unsigned char *)&tempbuf[start + 1];
for (j = 0; j < sizeof(samp_in_subpacket); j++) {
*(bptr + j) = (unsigned char)(samp_in_subpacket & 0xFF);
samp_in_subpacket = samp_in_subpacket >> 8;
}
op.packet = (unsigned char *)&tempbuf[start];
op.b_o_s = 0;
op.e_o_s = last_packet;
op.granulepos = (u_int64_t)(bytes_output * 8 / bits_per_sample /
channels);
op.packetno = packetno++;
ogg_stream_packetin(&os, &op);
bytes_output += bytes_per_subpacket;
}
if (remaining_bytes) {
int last_packet = last_frame;
start = complete_subpackets * bytes_per_subpacket;
samp_in_subpacket = remaining_bytes * 8 / bits_per_sample / channels;
tempbuf[start] = ((sizeof(samp_in_subpacket) & 3) << 6) +
((sizeof(samp_in_subpacket) & 4) >> 1);
tempbuf[start] |= (i == 0 ? PACKET_IS_SYNCPOINT : 0);
op.bytes = remaining_bytes + 1 + sizeof(samp_in_subpacket);
bptr = (unsigned char *)&tempbuf[start + 1];
for (j = 0; j < sizeof(samp_in_subpacket); j++) {
*(bptr + j) = (unsigned char)(samp_in_subpacket & 0xFF);
samp_in_subpacket = samp_in_subpacket >> 8;
}
op.packet = (unsigned char *)&tempbuf[start];
op.b_o_s = 0;
op.e_o_s = last_packet;
op.granulepos = (u_int64_t)(bytes_output * 8 / bits_per_sample /
channels);
op.packetno = packetno++;
ogg_stream_packetin(&os, &op);
bytes_output += remaining_bytes;
}
if (last_frame)
flush_pages();
else
queue_pages();
return EMOREDATA;
}
void pcm_packetizer_c::produce_eos_packet() {
char buf = 0;
process(&buf, 1, 1);
}
stamp_t pcm_packetizer_c::make_timestamp(ogg_int64_t granulepos) {
stamp_t stamp;
#ifndef INCORRECT_INTERLEAVING
stamp = (stamp_t)((double)old_granulepos * 1000000.0 /
(double)samples_per_sec);
old_granulepos = granulepos;
#else
stamp = (stamp_t)((double)granulepos * 1000000.0 /
(double)samples_per_sec);
#endif
return stamp;
}