Commit | Line | Data |
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c593cf7c | 1 | /* |
2 | * This file is part of DisOrder. | |
4dadf1a2 | 3 | * Copyright (C) 2008 Richard Kettlewell |
c593cf7c | 4 | * |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation; either version 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with this program; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
18 | * USA | |
19 | */ | |
20 | /** @file clients/playrtp-alsa.c | |
21 | * @brief RTP player - ALSA support | |
4dadf1a2 RK |
22 | * |
23 | * This has been rewritten to use the @ref alsabg.h interface and is therefore | |
24 | * now closely modelled on @ref playrtp-coreaudio.c. Given a similar interface | |
25 | * wrapping OSS the whole of playrtp could probably be greatly simplified. | |
c593cf7c | 26 | */ |
27 | ||
05b75f8d | 28 | #include "common.h" |
c593cf7c | 29 | |
146e86fb | 30 | #if HAVE_ALSA_ASOUNDLIB_H |
c593cf7c | 31 | |
32 | #include <poll.h> | |
33 | #include <alsa/asoundlib.h> | |
c593cf7c | 34 | #include <pthread.h> |
b28bddbb | 35 | #include <arpa/inet.h> |
c593cf7c | 36 | |
37 | #include "mem.h" | |
38 | #include "log.h" | |
39 | #include "vector.h" | |
40 | #include "heap.h" | |
41 | #include "playrtp.h" | |
4dadf1a2 | 42 | #include "alsabg.h" |
c593cf7c | 43 | |
4dadf1a2 RK |
44 | /** @brief Callback from alsa_bg_collect() */ |
45 | static int playrtp_alsa_supply(void *dst, | |
46 | unsigned supply_nsamples) { | |
47 | unsigned samples_available; | |
588b2763 | 48 | const struct packet *p; |
c593cf7c | 49 | |
4dadf1a2 | 50 | pthread_mutex_lock(&lock); |
588b2763 | 51 | p = playrtp_next_packet(); |
4dadf1a2 RK |
52 | if(p && contains(p, next_timestamp)) { |
53 | /* This packet is ready to play */ | |
54 | const uint32_t packet_end = p->timestamp + p->nsamples; | |
55 | const uint32_t offset = next_timestamp - p->timestamp; | |
56 | const uint16_t *src = (void *)(p->samples_raw + offset); | |
57 | samples_available = packet_end - next_timestamp; | |
58 | if(samples_available > supply_nsamples) | |
59 | samples_available = supply_nsamples; | |
60 | next_timestamp += samples_available; | |
61 | memcpy(dst, src, samples_available * sizeof (int16_t)); | |
62 | /* We don't bother junking the packet - that'll be dealt with next time | |
63 | * round */ | |
eabdb9b9 | 64 | } else { |
4dadf1a2 RK |
65 | /* No packet is ready to play (and there might be no packet at all) */ |
66 | samples_available = p ? p->timestamp - next_timestamp : supply_nsamples; | |
67 | if(samples_available > supply_nsamples) | |
68 | samples_available = supply_nsamples; | |
69 | /*info("infill %d", samples_available);*/ | |
70 | next_timestamp += samples_available; | |
71 | /* Unlike Core Audio the buffer is not guaranteed to be 0-filled */ | |
72 | memset(dst, 0, samples_available * sizeof (int16_t)); | |
eabdb9b9 | 73 | } |
4dadf1a2 RK |
74 | pthread_mutex_unlock(&lock); |
75 | return samples_available; | |
c593cf7c | 76 | } |
77 | ||
78 | void playrtp_alsa(void) { | |
4dadf1a2 RK |
79 | alsa_bg_init(device ? device : "default", |
80 | playrtp_alsa_supply); | |
c593cf7c | 81 | pthread_mutex_lock(&lock); |
82 | for(;;) { | |
83 | /* Wait for the buffer to fill up a bit */ | |
84 | playrtp_fill_buffer(); | |
4dadf1a2 | 85 | /* Start playing now */ |
c593cf7c | 86 | info("Playing..."); |
4dadf1a2 RK |
87 | next_timestamp = pheap_first(&packets)->timestamp; |
88 | active = 1; | |
89 | alsa_bg_enable(); | |
90 | /* Wait until the buffer empties out */ | |
91 | while(nsamples >= minbuffer | |
92 | || (nsamples > 0 | |
93 | && contains(pheap_first(&packets), next_timestamp))) { | |
94 | pthread_cond_wait(&cond, &lock); | |
c593cf7c | 95 | } |
4dadf1a2 RK |
96 | /* Stop playing for a bit until the buffer re-fills */ |
97 | alsa_bg_disable(); | |
c593cf7c | 98 | active = 0; |
4dadf1a2 | 99 | /* Go back round */ |
c593cf7c | 100 | } |
101 | } | |
102 | ||
103 | #endif | |
104 | ||
105 | /* | |
106 | Local Variables: | |
107 | c-basic-offset:2 | |
108 | comment-column:40 | |
109 | fill-column:79 | |
110 | indent-tabs-mode:nil | |
111 | End: | |
112 | */ |