| 1 | /* |
| 2 | * This file is part of DisOrder. |
| 3 | * Copyright (C) 2008 Richard Kettlewell |
| 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 3 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, |
| 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 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | */ |
| 18 | /** @file clients/playrtp-alsa.c |
| 19 | * @brief RTP player - ALSA support |
| 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. |
| 24 | */ |
| 25 | |
| 26 | #include "common.h" |
| 27 | |
| 28 | #if HAVE_ALSA_ASOUNDLIB_H |
| 29 | |
| 30 | #include <poll.h> |
| 31 | #include <alsa/asoundlib.h> |
| 32 | #include <pthread.h> |
| 33 | #include <arpa/inet.h> |
| 34 | |
| 35 | #include "mem.h" |
| 36 | #include "log.h" |
| 37 | #include "vector.h" |
| 38 | #include "heap.h" |
| 39 | #include "playrtp.h" |
| 40 | #include "alsabg.h" |
| 41 | |
| 42 | /** @brief Callback from alsa_bg_collect() */ |
| 43 | static int playrtp_alsa_supply(void *dst, |
| 44 | unsigned supply_nsamples) { |
| 45 | unsigned samples_available; |
| 46 | const struct packet *p; |
| 47 | |
| 48 | pthread_mutex_lock(&lock); |
| 49 | p = playrtp_next_packet(); |
| 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 */ |
| 62 | } else { |
| 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)); |
| 71 | } |
| 72 | pthread_mutex_unlock(&lock); |
| 73 | return samples_available; |
| 74 | } |
| 75 | |
| 76 | void playrtp_alsa(void) { |
| 77 | alsa_bg_init(device ? device : "default", |
| 78 | playrtp_alsa_supply); |
| 79 | pthread_mutex_lock(&lock); |
| 80 | for(;;) { |
| 81 | /* Wait for the buffer to fill up a bit */ |
| 82 | playrtp_fill_buffer(); |
| 83 | /* Start playing now */ |
| 84 | info("Playing..."); |
| 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); |
| 93 | } |
| 94 | /* Stop playing for a bit until the buffer re-fills */ |
| 95 | alsa_bg_disable(); |
| 96 | active = 0; |
| 97 | /* Go back round */ |
| 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 | */ |