Commit | Line | Data |
---|---|---|
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 | ||
28 | #include <config.h> | |
29 | ||
146e86fb | 30 | #if HAVE_ALSA_ASOUNDLIB_H |
c593cf7c | 31 | #include "types.h" |
32 | ||
33 | #include <poll.h> | |
34 | #include <alsa/asoundlib.h> | |
35 | #include <assert.h> | |
36 | #include <pthread.h> | |
b28bddbb | 37 | #include <arpa/inet.h> |
c593cf7c | 38 | |
39 | #include "mem.h" | |
40 | #include "log.h" | |
41 | #include "vector.h" | |
42 | #include "heap.h" | |
43 | #include "playrtp.h" | |
4dadf1a2 | 44 | #include "alsabg.h" |
c593cf7c | 45 | |
4dadf1a2 RK |
46 | /** @brief Callback from alsa_bg_collect() */ |
47 | static int playrtp_alsa_supply(void *dst, | |
48 | unsigned supply_nsamples) { | |
49 | unsigned samples_available; | |
c593cf7c | 50 | |
4dadf1a2 RK |
51 | pthread_mutex_lock(&lock); |
52 | const struct packet *p = playrtp_next_packet(); | |
53 | if(p && contains(p, next_timestamp)) { | |
54 | /* This packet is ready to play */ | |
55 | const uint32_t packet_end = p->timestamp + p->nsamples; | |
56 | const uint32_t offset = next_timestamp - p->timestamp; | |
57 | const uint16_t *src = (void *)(p->samples_raw + offset); | |
58 | samples_available = packet_end - next_timestamp; | |
59 | if(samples_available > supply_nsamples) | |
60 | samples_available = supply_nsamples; | |
61 | next_timestamp += samples_available; | |
62 | memcpy(dst, src, samples_available * sizeof (int16_t)); | |
63 | /* We don't bother junking the packet - that'll be dealt with next time | |
64 | * round */ | |
eabdb9b9 | 65 | } else { |
4dadf1a2 RK |
66 | /* No packet is ready to play (and there might be no packet at all) */ |
67 | samples_available = p ? p->timestamp - next_timestamp : supply_nsamples; | |
68 | if(samples_available > supply_nsamples) | |
69 | samples_available = supply_nsamples; | |
70 | /*info("infill %d", samples_available);*/ | |
71 | next_timestamp += samples_available; | |
72 | /* Unlike Core Audio the buffer is not guaranteed to be 0-filled */ | |
73 | memset(dst, 0, samples_available * sizeof (int16_t)); | |
eabdb9b9 | 74 | } |
4dadf1a2 RK |
75 | pthread_mutex_unlock(&lock); |
76 | return samples_available; | |
c593cf7c | 77 | } |
78 | ||
79 | void playrtp_alsa(void) { | |
4dadf1a2 RK |
80 | alsa_bg_init(device ? device : "default", |
81 | playrtp_alsa_supply); | |
c593cf7c | 82 | pthread_mutex_lock(&lock); |
83 | for(;;) { | |
84 | /* Wait for the buffer to fill up a bit */ | |
85 | playrtp_fill_buffer(); | |
4dadf1a2 | 86 | /* Start playing now */ |
c593cf7c | 87 | info("Playing..."); |
4dadf1a2 RK |
88 | next_timestamp = pheap_first(&packets)->timestamp; |
89 | active = 1; | |
90 | alsa_bg_enable(); | |
91 | /* Wait until the buffer empties out */ | |
92 | while(nsamples >= minbuffer | |
93 | || (nsamples > 0 | |
94 | && contains(pheap_first(&packets), next_timestamp))) { | |
95 | pthread_cond_wait(&cond, &lock); | |
c593cf7c | 96 | } |
4dadf1a2 RK |
97 | /* Stop playing for a bit until the buffer re-fills */ |
98 | alsa_bg_disable(); | |
c593cf7c | 99 | active = 0; |
4dadf1a2 | 100 | /* Go back round */ |
c593cf7c | 101 | } |
102 | } | |
103 | ||
104 | #endif | |
105 | ||
106 | /* | |
107 | Local Variables: | |
108 | c-basic-offset:2 | |
109 | comment-column:40 | |
110 | fill-column:79 | |
111 | indent-tabs-mode:nil | |
112 | End: | |
113 | */ |