root/branches/libfreebob-2.0/src/libstreaming/PacketBuffer.cpp

Revision 201, 4.0 kB (checked in by pieterpalmers, 18 years ago)

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1 /* $Id$ */
2
3 /*
4  *   FreeBob Streaming API
5  *   FreeBob = Firewire (pro-)audio for linux
6  *
7  *   http://freebob.sf.net
8  *
9  *   Copyright (C) 2005,2006 Pieter Palmers <pieterpalmers@users.sourceforge.net>
10  *
11  *   This program is free software {} you can redistribute it and/or modify
12  *   it under the terms of the GNU General Public License as published by
13  *   the Free Software Foundation {} either version 2 of the License, or
14  *   (at your option) any later version.
15  *
16  *   This program is distributed in the hope that it will be useful,
17  *   but WITHOUT ANY WARRANTY {} without even the implied warranty of
18  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  *   GNU General Public License for more details.
20  *
21  *   You should have received a copy of the GNU General Public License
22  *   along with this program {} if not, write to the Free Software
23  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  *
25  *
26  *
27  */
28
29 #include "PacketBuffer.h"
30
31 namespace FreebobStreaming {
32
33 IMPL_DEBUG_MODULE( PacketBuffer, PacketBuffer, DEBUG_LEVEL_VERBOSE );
34
35
36 PacketBuffer::~PacketBuffer() {
37         if(payload_buffer) freebob_ringbuffer_free(payload_buffer);
38         if(header_buffer) freebob_ringbuffer_free(header_buffer);
39         if(len_buffer) freebob_ringbuffer_free(len_buffer);
40 }
41
42 int PacketBuffer::initialize() {
43         debugOutput( DEBUG_LEVEL_VERBOSE, "enter...\n");
44
45         if(payload_buffer) freebob_ringbuffer_free(payload_buffer);
46         if(header_buffer) freebob_ringbuffer_free(header_buffer);
47         if(len_buffer) freebob_ringbuffer_free(len_buffer);
48
49         payload_buffer=freebob_ringbuffer_create(m_buffersize * m_max_packetsize * sizeof(quadlet_t));
50         if(!payload_buffer) {
51                 debugFatal("Could not allocate payload buffer\n");
52                 return -1;
53         }
54
55         header_buffer=freebob_ringbuffer_create(m_buffersize * (m_headersize) * sizeof(quadlet_t));
56         if(!header_buffer) {
57                 debugFatal("Could not allocate header buffer\n");
58                 return -1;
59         }
60
61         len_buffer=freebob_ringbuffer_create(m_buffersize * sizeof(unsigned int));
62         if(!len_buffer) {
63                 debugFatal("Could not allocate len buffer\n");
64                 return -1;
65         }
66         debugOutput( DEBUG_LEVEL_VERBOSE, "exit...\n");
67
68         return 0;
69 }
70
71 void PacketBuffer::flush() {
72         if(header_buffer) {
73                 freebob_ringbuffer_reset(header_buffer);
74         }
75         if(payload_buffer) {
76                 freebob_ringbuffer_reset(payload_buffer);
77         }
78         if(len_buffer) {
79                 freebob_ringbuffer_reset(len_buffer);
80         }
81 }
82
83 int PacketBuffer::addPacket(quadlet_t *packet, int packet_len) {
84
85         unsigned int payload_bytes=sizeof(quadlet_t)*(packet_len-m_headersize);
86         unsigned int header_bytes=sizeof(quadlet_t)*(m_headersize);
87
88         debugOutput( DEBUG_LEVEL_VERY_VERBOSE,
89                      "add packet: length=%d\n",
90                      packet_len);
91
92         if ((freebob_ringbuffer_write_space(payload_buffer) > payload_bytes)
93             && (freebob_ringbuffer_write_space(header_buffer) > header_bytes)) {
94
95                 freebob_ringbuffer_write(payload_buffer,(char *)(packet)+header_bytes, payload_bytes);
96                 freebob_ringbuffer_write(len_buffer,(char *)(&payload_bytes),sizeof(unsigned int));
97                 freebob_ringbuffer_write(header_buffer,(char *)(packet), header_bytes);
98
99         } else return -1;
100         return 0;
101
102 }
103
104 int PacketBuffer::getNextPacket(quadlet_t *packet, int max_packet_len) {
105
106         unsigned int bytes=sizeof(quadlet_t)*(m_headersize);
107         quadlet_t *ptr=packet+m_headersize;
108
109         debugOutput( DEBUG_LEVEL_VERY_VERBOSE,
110                      "getNextPacket\n");
111
112         if(max_packet_len<m_headersize) return -2;
113
114         if (freebob_ringbuffer_read(header_buffer,(char *)packet,bytes) < bytes) {
115                 return -1;
116         }
117
118         if (freebob_ringbuffer_read(len_buffer,(char *)&bytes, sizeof(unsigned int)) < sizeof(unsigned int)) {
119                 return -3;
120         }
121
122         if(bytes>(max_packet_len-m_headersize)*sizeof(quadlet_t)) return -2;
123
124         if(freebob_ringbuffer_read(payload_buffer,(char *)(ptr),bytes) < bytes) {
125                 return -3;
126         }
127
128         return bytes/sizeof(quadlet_t)+m_headersize;
129 }
130
131 int PacketBuffer::getBufferFillPackets() {
132
133         return freebob_ringbuffer_read_space(len_buffer)/sizeof(unsigned int);
134 }
135
136 // in quadlets
137 int PacketBuffer::getBufferFillPayload() {
138
139         return freebob_ringbuffer_read_space(payload_buffer)/sizeof(quadlet_t);
140 }
141
142 }
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