Commit | Line | Data |
---|---|---|
c593cf7c | 1 | /* |
2 | * This file is part of DisOrder. | |
4dadf1a2 | 3 | * Copyright (C) 2008 Richard Kettlewell |
c593cf7c | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
c593cf7c | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
c593cf7c | 8 | * (at your option) any later version. |
9 | * | |
e7eb3a27 RK |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
c593cf7c | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
c593cf7c | 17 | */ |
18 | /** @file clients/playrtp-alsa.c | |
19 | * @brief RTP player - ALSA support | |
4dadf1a2 RK |
20 | * |
21 | * This has been rewritten to use the @ref alsabg.h interface and is therefore | |
22 | * now closely modelled on @ref playrtp-coreaudio.c. Given a similar interface | |
23 | * wrapping OSS the whole of playrtp could probably be greatly simplified. | |
c593cf7c | 24 | */ |
25 | ||
05b75f8d | 26 | #include "common.h" |
c593cf7c | 27 | |
146e86fb | 28 | #if HAVE_ALSA_ASOUNDLIB_H |
c593cf7c | 29 | |
30 | #include <poll.h> | |
31 | #include <alsa/asoundlib.h> | |
c593cf7c | 32 | #include <pthread.h> |
b28bddbb | 33 | #include <arpa/inet.h> |
c593cf7c | 34 | |
35 | #include "mem.h" | |
36 | #include "log.h" | |
37 | #include "vector.h" | |
38 | #include "heap.h" | |
39 | #include "playrtp.h" | |
4dadf1a2 | 40 | #include "alsabg.h" |
c593cf7c | 41 | |
4dadf1a2 RK |
42 | /** @brief Callback from alsa_bg_collect() */ |
43 | static int playrtp_alsa_supply(void *dst, | |
44 | unsigned supply_nsamples) { | |
45 | unsigned samples_available; | |
588b2763 | 46 | const struct packet *p; |
c593cf7c | 47 | |
4dadf1a2 | 48 | pthread_mutex_lock(&lock); |
588b2763 | 49 | p = playrtp_next_packet(); |
4dadf1a2 RK |
50 | if(p && contains(p, next_timestamp)) { |
51 | /* This packet is ready to play */ | |
52 | const uint32_t packet_end = p->timestamp + p->nsamples; | |
53 | const uint32_t offset = next_timestamp - p->timestamp; | |
54 | const uint16_t *src = (void *)(p->samples_raw + offset); | |
55 | samples_available = packet_end - next_timestamp; | |
56 | if(samples_available > supply_nsamples) | |
57 | samples_available = supply_nsamples; | |
58 | next_timestamp += samples_available; | |
59 | memcpy(dst, src, samples_available * sizeof (int16_t)); | |
60 | /* We don't bother junking the packet - that'll be dealt with next time | |
61 | * round */ | |
eabdb9b9 | 62 | } else { |
4dadf1a2 RK |
63 | /* No packet is ready to play (and there might be no packet at all) */ |
64 | samples_available = p ? p->timestamp - next_timestamp : supply_nsamples; | |
65 | if(samples_available > supply_nsamples) | |
66 | samples_available = supply_nsamples; | |
67 | /*info("infill %d", samples_available);*/ | |
68 | next_timestamp += samples_available; | |
69 | /* Unlike Core Audio the buffer is not guaranteed to be 0-filled */ | |
70 | memset(dst, 0, samples_available * sizeof (int16_t)); | |
eabdb9b9 | 71 | } |
4dadf1a2 RK |
72 | pthread_mutex_unlock(&lock); |
73 | return samples_available; | |
c593cf7c | 74 | } |
75 | ||
76 | void playrtp_alsa(void) { | |
4dadf1a2 RK |
77 | alsa_bg_init(device ? device : "default", |
78 | playrtp_alsa_supply); | |
c593cf7c | 79 | pthread_mutex_lock(&lock); |
80 | for(;;) { | |
81 | /* Wait for the buffer to fill up a bit */ | |
82 | playrtp_fill_buffer(); | |
4dadf1a2 | 83 | /* Start playing now */ |
c593cf7c | 84 | info("Playing..."); |
4dadf1a2 RK |
85 | next_timestamp = pheap_first(&packets)->timestamp; |
86 | active = 1; | |
87 | alsa_bg_enable(); | |
88 | /* Wait until the buffer empties out */ | |
89 | while(nsamples >= minbuffer | |
90 | || (nsamples > 0 | |
91 | && contains(pheap_first(&packets), next_timestamp))) { | |
92 | pthread_cond_wait(&cond, &lock); | |
c593cf7c | 93 | } |
4dadf1a2 RK |
94 | /* Stop playing for a bit until the buffer re-fills */ |
95 | alsa_bg_disable(); | |
c593cf7c | 96 | active = 0; |
4dadf1a2 | 97 | /* Go back round */ |
c593cf7c | 98 | } |
99 | } | |
100 | ||
101 | #endif | |
102 | ||
103 | /* | |
104 | Local Variables: | |
105 | c-basic-offset:2 | |
106 | comment-column:40 | |
107 | fill-column:79 | |
108 | indent-tabs-mode:nil | |
109 | End: | |
110 | */ |