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
|
#include <stdlib.h>
#include <pthread.h>
#include <assert.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include "vlc_input.h"
libvlc_instance_t *m_vlc;
libvlc_media_player_t *m_mp;
unsigned int vlc_rate;
struct vlc_buffer *head_buffer;
pthread_mutex_t buffer_lock = PTHREAD_MUTEX_INITIALIZER;
struct vlc_buffer* vlc_buffer_new()
{
struct vlc_buffer* node;
node = malloc(sizeof(struct vlc_buffer));
memset(node, 0, sizeof(struct vlc_buffer));
return node;
}
void vlc_buffer_free(struct vlc_buffer* node)
{
if (node->buf) {
free(node->buf);
}
free(node);
}
size_t vlc_buffer_totalsize(struct vlc_buffer* node)
{
size_t totalsize = 0;
for (; node != NULL; node = node->next) {
totalsize += node->size;
}
return totalsize;
}
// VLC Audio prerender callback, we must allocate a buffer here
void prepareRender(
void* p_audio_data,
uint8_t** pp_pcm_buffer,
size_t size)
{
*pp_pcm_buffer = malloc(size);
return;
}
// Audio postrender callback
void handleStream(
void* p_audio_data,
uint8_t* p_pcm_buffer,
unsigned int channels,
unsigned int rate,
unsigned int nb_samples,
unsigned int bits_per_sample,
size_t size,
int64_t pts)
{
assert(channels == 2);
assert(rate == vlc_rate);
assert(bits_per_sample == 16);
// 16 is a bit arbitrary, if it's too small we might enter
// a deadlock if toolame asks for too much data
const size_t max_length = 16 * size;
for (;;) {
pthread_mutex_lock(&buffer_lock);
if (vlc_buffer_totalsize(head_buffer) < max_length) {
struct vlc_buffer* newbuf = vlc_buffer_new();
newbuf->buf = p_pcm_buffer;
newbuf->size = size;
// Append the new buffer to the end of the linked list
struct vlc_buffer* tail = head_buffer;
while (tail->next) {
tail = tail->next;
}
tail->next = newbuf;
pthread_mutex_unlock(&buffer_lock);
return;
}
pthread_mutex_unlock(&buffer_lock);
usleep(100);
}
}
int vlc_in_prepare(unsigned verbosity, unsigned int rate, const char* uri)
{
int err;
fprintf(stderr, "Initialising VLC...\n");
vlc_rate = rate;
// VLC options
char smem_options[512];
snprintf(smem_options, sizeof(smem_options),
"#transcode{acodec=s16l,samplerate=%d}:"
// We are using transcode because smem only support raw audio and
// video formats
"smem{"
"audio-postrender-callback=%lld,"
"audio-prerender-callback=%lld"
"}",
vlc_rate,
(long long int)(intptr_t)(void*)&handleStream,
(long long int)(intptr_t)(void*)&prepareRender);
char verb_options[512];
snprintf(verb_options, sizeof(verb_options),
"--verbose=%d", verbosity);
const char * const vlc_args[] = {
verb_options,
"--sout", smem_options // Stream to memory
};
// Launch VLC
m_vlc = libvlc_new(sizeof(vlc_args) / sizeof(vlc_args[0]), vlc_args);
// Load the media
libvlc_media_t *m;
m = libvlc_media_new_location(m_vlc, uri);
m_mp = libvlc_media_player_new_from_media(m);
libvlc_media_release(m);
// Allocate the list
head_buffer = vlc_buffer_new();
// Start playing
return libvlc_media_player_play(m_mp);
}
ssize_t vlc_in_read(void *buf, size_t len)
{
size_t requested = len;
for (;;) {
pthread_mutex_lock(&buffer_lock);
if (vlc_buffer_totalsize(head_buffer) >= len) {
while (len >= head_buffer->size) {
if (head_buffer->buf) {
// Get all the data from this list element
memcpy(buf, head_buffer->buf, head_buffer->size);
buf += head_buffer->size;
len -= head_buffer->size;
}
if (head_buffer->next) {
struct vlc_buffer *next_head = head_buffer->next;
vlc_buffer_free(head_buffer);
head_buffer = next_head;
}
else {
vlc_buffer_free(head_buffer);
head_buffer = vlc_buffer_new();
break;
}
}
if (len > 0) {
assert(len < head_buffer->size);
memcpy(buf, head_buffer->buf, len);
// split the current head into two parts
size_t remaining = head_buffer->size - len;
uint8_t *newbuf = malloc(remaining);
memcpy(newbuf, head_buffer->buf + len, remaining);
free(head_buffer->buf);
head_buffer->buf = newbuf;
head_buffer->size = remaining;
}
pthread_mutex_unlock(&buffer_lock);
return requested;
}
pthread_mutex_unlock(&buffer_lock);
usleep(100);
libvlc_media_t *media = libvlc_media_player_get_media(m_mp);
if (libvlc_media_get_state(media) == libvlc_Error) {
return -1;
}
}
abort();
}
|
