Commit | Line | Data |
---|---|---|
e83d0967 RK |
1 | /* |
2 | * This file is part of DisOrder. | |
3 | * Copyright (C) 2007 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 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 | */ | |
28bacdc0 RK |
20 | /** @file clients/playrtp.c |
21 | * @brief RTP player | |
22 | * | |
b0fdc63d | 23 | * This player supports Linux (<a href="http://www.alsa-project.org/">ALSA</a>) |
24 | * and Apple Mac (<a | |
25 | * href="http://developer.apple.com/audio/coreaudio.html">Core Audio</a>) | |
26 | * systems. There is no support for Microsoft Windows yet, and that will in | |
27 | * fact probably an entirely separate program. | |
28 | * | |
29 | * The program runs (at least) two threads. listen_thread() is responsible for | |
30 | * reading RTP packets off the wire and adding them to the binary heap @ref | |
31 | * packets, assuming they are basically sound. | |
32 | * | |
33 | * The main thread is responsible for actually playing audio. In ALSA this | |
34 | * means it waits until ALSA says it's ready for more audio which it then | |
35 | * plays. | |
36 | * | |
37 | * InCore Audio the main thread is only responsible for starting and stopping | |
38 | * play: the system does the actual playback in its own private thread, and | |
39 | * calls adioproc() to fetch the audio data. | |
40 | * | |
41 | * Sometimes it happens that there is no audio available to play. This may | |
42 | * because the server went away, or a packet was dropped, or the server | |
43 | * deliberately did not send any sound because it encountered a silence. | |
28bacdc0 | 44 | */ |
e83d0967 RK |
45 | |
46 | #include <config.h> | |
47 | #include "types.h" | |
48 | ||
49 | #include <getopt.h> | |
50 | #include <stdio.h> | |
51 | #include <stdlib.h> | |
52 | #include <sys/socket.h> | |
53 | #include <sys/types.h> | |
54 | #include <sys/socket.h> | |
55 | #include <netdb.h> | |
56 | #include <pthread.h> | |
0b75463f | 57 | #include <locale.h> |
2c7c9eae | 58 | #include <sys/uio.h> |
28bacdc0 | 59 | #include <string.h> |
e83d0967 RK |
60 | |
61 | #include "log.h" | |
62 | #include "mem.h" | |
63 | #include "configuration.h" | |
64 | #include "addr.h" | |
65 | #include "syscalls.h" | |
66 | #include "rtp.h" | |
0b75463f | 67 | #include "defs.h" |
28bacdc0 RK |
68 | #include "vector.h" |
69 | #include "heap.h" | |
e83d0967 RK |
70 | |
71 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H | |
72 | # include <CoreAudio/AudioHardware.h> | |
73 | #endif | |
0b75463f | 74 | #if API_ALSA |
75 | #include <alsa/asoundlib.h> | |
76 | #endif | |
e83d0967 | 77 | |
1153fd23 | 78 | #define readahead linux_headers_are_borked |
79 | ||
0b75463f | 80 | /** @brief RTP socket */ |
e83d0967 RK |
81 | static int rtpfd; |
82 | ||
345ebe66 RK |
83 | /** @brief Log output */ |
84 | static FILE *logfp; | |
85 | ||
0b75463f | 86 | /** @brief Output device */ |
87 | static const char *device; | |
88 | ||
89 | /** @brief Maximum samples per packet we'll support | |
90 | * | |
91 | * NB that two channels = two samples in this program. | |
92 | */ | |
93 | #define MAXSAMPLES 2048 | |
94 | ||
9086a105 | 95 | /** @brief Minimum low watermark |
0b75463f | 96 | * |
97 | * We'll stop playing if there's only this many samples in the buffer. */ | |
1153fd23 | 98 | static unsigned minbuffer = 2 * 44100 / 10; /* 0.2 seconds */ |
0b75463f | 99 | |
9086a105 | 100 | /** @brief Buffer high watermark |
1153fd23 | 101 | * |
102 | * We'll only start playing when this many samples are available. */ | |
8d0c14d7 | 103 | static unsigned readahead = 2 * 2 * 44100; |
0b75463f | 104 | |
9086a105 RK |
105 | /** @brief Maximum buffer size |
106 | * | |
107 | * We'll stop reading from the network if we have this many samples. */ | |
108 | static unsigned maxbuffer; | |
109 | ||
28bacdc0 RK |
110 | /** @brief Number of samples to infill by in one go |
111 | * | |
58b5a68f | 112 | * This is an upper bound - in practice we expect the underlying audio API to |
28bacdc0 RK |
113 | * only ask for a much smaller number of samples in any one go. |
114 | */ | |
c0e41690 | 115 | #define INFILL_SAMPLES (44100 * 2) /* 1s */ |
116 | ||
28bacdc0 RK |
117 | /** @brief Received packet |
118 | * | |
119 | * Received packets are kept in a binary heap (see @ref pheap) ordered by | |
120 | * timestamp. | |
121 | */ | |
0b75463f | 122 | struct packet { |
0b75463f | 123 | /** @brief Number of samples in this packet */ |
c0e41690 | 124 | uint32_t nsamples; |
58b5a68f | 125 | |
0b75463f | 126 | /** @brief Timestamp from RTP packet |
127 | * | |
28bacdc0 RK |
128 | * NB that "timestamps" are really sample counters. Use lt() or lt_packet() |
129 | * to compare timestamps. | |
130 | */ | |
0b75463f | 131 | uint32_t timestamp; |
58b5a68f RK |
132 | |
133 | /** @brief Flags | |
134 | * | |
135 | * Valid values are: | |
b0fdc63d | 136 | * - @ref IDLE - the idle bit was set in the RTP packet |
58b5a68f RK |
137 | */ |
138 | unsigned flags; | |
b0fdc63d | 139 | /** @brief idle bit set in RTP packet*/ |
140 | #define IDLE 0x0001 | |
58b5a68f | 141 | |
28bacdc0 RK |
142 | /** @brief Raw sample data |
143 | * | |
144 | * Only the first @p nsamples samples are defined; the rest is uninitialized | |
145 | * data. | |
146 | */ | |
b64efe7e | 147 | uint16_t samples_raw[MAXSAMPLES]; |
e83d0967 RK |
148 | }; |
149 | ||
28bacdc0 | 150 | /** @brief Return true iff \f$a < b\f$ in sequence-space arithmetic |
0b75463f | 151 | * |
28bacdc0 RK |
152 | * Specifically it returns true if \f$(a-b) mod 2^{32} < 2^{31}\f$. |
153 | * | |
154 | * See also lt_packet(). | |
155 | */ | |
156 | static inline int lt(uint32_t a, uint32_t b) { | |
157 | return (uint32_t)(a - b) & 0x80000000; | |
158 | } | |
2c7c9eae | 159 | |
28bacdc0 RK |
160 | /** @brief Return true iff a >= b in sequence-space arithmetic */ |
161 | static inline int ge(uint32_t a, uint32_t b) { | |
162 | return !lt(a, b); | |
163 | } | |
164 | ||
165 | /** @brief Return true iff a > b in sequence-space arithmetic */ | |
166 | static inline int gt(uint32_t a, uint32_t b) { | |
167 | return lt(b, a); | |
168 | } | |
169 | ||
170 | /** @brief Return true iff a <= b in sequence-space arithmetic */ | |
171 | static inline int le(uint32_t a, uint32_t b) { | |
172 | return !lt(b, a); | |
173 | } | |
174 | ||
175 | /** @brief Ordering for packets, used by @ref pheap */ | |
176 | static inline int lt_packet(const struct packet *a, const struct packet *b) { | |
177 | return lt(a->timestamp, b->timestamp); | |
178 | } | |
179 | ||
180 | /** @struct pheap | |
181 | * @brief Binary heap of packets ordered by timestamp */ | |
182 | HEAP_TYPE(pheap, struct packet *, lt_packet); | |
183 | ||
184 | /** @brief Binary heap of received packets */ | |
185 | static struct pheap packets; | |
186 | ||
187 | /** @brief Total number of samples available */ | |
188 | static unsigned long nsamples; | |
0b75463f | 189 | |
190 | /** @brief Timestamp of next packet to play. | |
191 | * | |
192 | * This is set to the timestamp of the last packet, plus the number of | |
09ee2f0d | 193 | * samples it contained. Only valid if @ref active is nonzero. |
0b75463f | 194 | */ |
195 | static uint32_t next_timestamp; | |
e83d0967 | 196 | |
09ee2f0d | 197 | /** @brief True if actively playing |
198 | * | |
199 | * This is true when playing and false when just buffering. */ | |
200 | static int active; | |
201 | ||
2c7c9eae RK |
202 | /** @brief Structure of free packet list */ |
203 | union free_packet { | |
204 | struct packet p; | |
205 | union free_packet *next; | |
206 | }; | |
207 | ||
28bacdc0 RK |
208 | /** @brief Linked list of free packets |
209 | * | |
210 | * This is a linked list of formerly used packets. For preference we re-use | |
211 | * packets that have already been used rather than unused ones, to limit the | |
212 | * size of the program's working set. If there are no free packets in the list | |
213 | * we try @ref next_free_packet instead. | |
214 | * | |
215 | * Must hold @ref lock when accessing this. | |
216 | */ | |
2c7c9eae RK |
217 | static union free_packet *free_packets; |
218 | ||
28bacdc0 RK |
219 | /** @brief Array of new free packets |
220 | * | |
221 | * There are @ref count_free_packets ready to use at this address. If there | |
222 | * are none left we allocate more memory. | |
223 | * | |
224 | * Must hold @ref lock when accessing this. | |
225 | */ | |
2c7c9eae RK |
226 | static union free_packet *next_free_packet; |
227 | ||
28bacdc0 RK |
228 | /** @brief Count of new free packets at @ref next_free_packet |
229 | * | |
230 | * Must hold @ref lock when accessing this. | |
231 | */ | |
2c7c9eae RK |
232 | static size_t count_free_packets; |
233 | ||
28bacdc0 RK |
234 | /** @brief Lock protecting @ref packets |
235 | * | |
236 | * This also protects the packet memory allocation infrastructure, @ref | |
237 | * free_packets and @ref next_free_packet. */ | |
e83d0967 | 238 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; |
e83d0967 | 239 | |
0b75463f | 240 | /** @brief Condition variable signalled whenever @ref packets is changed */ |
241 | static pthread_cond_t cond = PTHREAD_COND_INITIALIZER; | |
e83d0967 RK |
242 | |
243 | static const struct option options[] = { | |
244 | { "help", no_argument, 0, 'h' }, | |
245 | { "version", no_argument, 0, 'V' }, | |
246 | { "debug", no_argument, 0, 'd' }, | |
0b75463f | 247 | { "device", required_argument, 0, 'D' }, |
1153fd23 | 248 | { "min", required_argument, 0, 'm' }, |
9086a105 | 249 | { "max", required_argument, 0, 'x' }, |
1153fd23 | 250 | { "buffer", required_argument, 0, 'b' }, |
e83d0967 RK |
251 | { 0, 0, 0, 0 } |
252 | }; | |
253 | ||
2c7c9eae RK |
254 | /** @brief Return a new packet |
255 | * | |
256 | * Assumes that @ref lock is held. */ | |
257 | static struct packet *new_packet(void) { | |
258 | struct packet *p; | |
259 | ||
260 | if(free_packets) { | |
261 | p = &free_packets->p; | |
262 | free_packets = free_packets->next; | |
263 | } else { | |
264 | if(!count_free_packets) { | |
265 | next_free_packet = xcalloc(1024, sizeof (union free_packet)); | |
266 | count_free_packets = 1024; | |
267 | } | |
268 | p = &(next_free_packet++)->p; | |
269 | --count_free_packets; | |
270 | } | |
271 | return p; | |
272 | } | |
273 | ||
274 | /** @brief Free a packet | |
275 | * | |
276 | * Assumes that @ref lock is held. */ | |
277 | static void free_packet(struct packet *p) { | |
278 | union free_packet *u = (union free_packet *)p; | |
279 | u->next = free_packets; | |
280 | free_packets = u; | |
281 | } | |
282 | ||
28bacdc0 RK |
283 | /** @brief Drop the first packet |
284 | * | |
285 | * Assumes that @ref lock is held. | |
286 | */ | |
287 | static void drop_first_packet(void) { | |
288 | if(pheap_count(&packets)) { | |
289 | struct packet *const p = pheap_remove(&packets); | |
290 | nsamples -= p->nsamples; | |
291 | free_packet(p); | |
2c7c9eae | 292 | pthread_cond_broadcast(&cond); |
2c7c9eae | 293 | } |
9086a105 RK |
294 | } |
295 | ||
09ee2f0d | 296 | /** @brief Background thread collecting samples |
0b75463f | 297 | * |
298 | * This function collects samples, perhaps converts them to the target format, | |
b0fdc63d | 299 | * and adds them to the packet list. |
300 | * | |
301 | * It is crucial that the gap between successive calls to read() is as small as | |
302 | * possible: otherwise packets will be dropped. | |
303 | * | |
304 | * We use a binary heap to ensure that the unavoidable effort is at worst | |
305 | * logarithmic in the total number of packets - in fact if packets are mostly | |
306 | * received in order then we will largely do constant work per packet since the | |
307 | * newest packet will always be last. | |
308 | * | |
309 | * Of more concern is that we must acquire the lock on the heap to add a packet | |
310 | * to it. If this proves a problem in practice then the answer would be | |
311 | * (probably doubly) linked list with new packets added the end and a second | |
312 | * thread which reads packets off the list and adds them to the heap. | |
313 | * | |
314 | * We keep memory allocation (mostly) very fast by keeping pre-allocated | |
315 | * packets around; see @ref new_packet(). | |
316 | */ | |
0b75463f | 317 | static void *listen_thread(void attribute((unused)) *arg) { |
2c7c9eae | 318 | struct packet *p = 0; |
0b75463f | 319 | int n; |
2c7c9eae RK |
320 | struct rtp_header header; |
321 | uint16_t seq; | |
322 | uint32_t timestamp; | |
323 | struct iovec iov[2]; | |
e83d0967 RK |
324 | |
325 | for(;;) { | |
2c7c9eae RK |
326 | if(!p) { |
327 | pthread_mutex_lock(&lock); | |
328 | p = new_packet(); | |
329 | pthread_mutex_unlock(&lock); | |
330 | } | |
331 | iov[0].iov_base = &header; | |
332 | iov[0].iov_len = sizeof header; | |
333 | iov[1].iov_base = p->samples_raw; | |
b64efe7e | 334 | iov[1].iov_len = sizeof p->samples_raw / sizeof *p->samples_raw; |
2c7c9eae | 335 | n = readv(rtpfd, iov, 2); |
e83d0967 RK |
336 | if(n < 0) { |
337 | switch(errno) { | |
338 | case EINTR: | |
339 | continue; | |
340 | default: | |
341 | fatal(errno, "error reading from socket"); | |
342 | } | |
343 | } | |
0b75463f | 344 | /* Ignore too-short packets */ |
345ebe66 RK |
345 | if((size_t)n <= sizeof (struct rtp_header)) { |
346 | info("ignored a short packet"); | |
0b75463f | 347 | continue; |
345ebe66 | 348 | } |
2c7c9eae RK |
349 | timestamp = htonl(header.timestamp); |
350 | seq = htons(header.seq); | |
09ee2f0d | 351 | /* Ignore packets in the past */ |
2c7c9eae | 352 | if(active && lt(timestamp, next_timestamp)) { |
c0e41690 | 353 | info("dropping old packet, timestamp=%"PRIx32" < %"PRIx32, |
2c7c9eae | 354 | timestamp, next_timestamp); |
09ee2f0d | 355 | continue; |
c0e41690 | 356 | } |
2c7c9eae | 357 | pthread_mutex_lock(&lock); |
58b5a68f | 358 | p->flags = 0; |
2c7c9eae | 359 | p->timestamp = timestamp; |
e83d0967 | 360 | /* Convert to target format */ |
58b5a68f RK |
361 | if(header.mpt & 0x80) |
362 | p->flags |= IDLE; | |
2c7c9eae | 363 | switch(header.mpt & 0x7F) { |
e83d0967 | 364 | case 10: |
2c7c9eae | 365 | p->nsamples = (n - sizeof header) / sizeof(uint16_t); |
e83d0967 RK |
366 | break; |
367 | /* TODO support other RFC3551 media types (when the speaker does) */ | |
368 | default: | |
0b75463f | 369 | fatal(0, "unsupported RTP payload type %d", |
2c7c9eae | 370 | header.mpt & 0x7F); |
e83d0967 | 371 | } |
345ebe66 RK |
372 | if(logfp) |
373 | fprintf(logfp, "sequence %u timestamp %"PRIx32" length %"PRIx32" end %"PRIx32"\n", | |
2c7c9eae | 374 | seq, timestamp, p->nsamples, timestamp + p->nsamples); |
0b75463f | 375 | /* Stop reading if we've reached the maximum. |
376 | * | |
377 | * This is rather unsatisfactory: it means that if packets get heavily | |
378 | * out of order then we guarantee dropouts. But for now... */ | |
345ebe66 | 379 | if(nsamples >= maxbuffer) { |
7aa087a7 RK |
380 | //info("Buffer full"); |
381 | write(2, "B", 1); | |
345ebe66 RK |
382 | while(nsamples >= maxbuffer) |
383 | pthread_cond_wait(&cond, &lock); | |
384 | } | |
28bacdc0 RK |
385 | /* Add the packet to the heap */ |
386 | pheap_insert(&packets, p); | |
2c7c9eae | 387 | nsamples += p->nsamples; |
58b5a68f RK |
388 | /* We'll need a new packet */ |
389 | p = 0; | |
2c7c9eae | 390 | pthread_cond_broadcast(&cond); |
e83d0967 | 391 | pthread_mutex_unlock(&lock); |
e83d0967 RK |
392 | } |
393 | } | |
394 | ||
b0fdc63d | 395 | /** @brief Return true if @p p contains @p timestamp |
396 | * | |
397 | * Containment implies that a sample @p timestamp exists within the packet. | |
398 | */ | |
2c7c9eae RK |
399 | static inline int contains(const struct packet *p, uint32_t timestamp) { |
400 | const uint32_t packet_start = p->timestamp; | |
401 | const uint32_t packet_end = p->timestamp + p->nsamples; | |
402 | ||
403 | return (ge(timestamp, packet_start) | |
404 | && lt(timestamp, packet_end)); | |
405 | } | |
406 | ||
5626f6d2 RK |
407 | /** @brief Wait until the buffer is adequately full |
408 | * | |
409 | * Must be called with @ref lock held. | |
410 | */ | |
411 | static void fill_buffer(void) { | |
412 | info("Buffering..."); | |
413 | while(nsamples < readahead) | |
414 | pthread_cond_wait(&cond, &lock); | |
415 | next_timestamp = pheap_first(&packets)->timestamp; | |
416 | active = 1; | |
417 | } | |
418 | ||
419 | /** @brief Find next packet | |
420 | * @return Packet to play or NULL if none found | |
421 | * | |
422 | * The return packet is merely guaranteed not to be in the past: it might be | |
423 | * the first packet in the future rather than one that is actually suitable to | |
424 | * play. | |
425 | * | |
426 | * Must be called with @ref lock held. | |
427 | */ | |
428 | static struct packet *next_packet(void) { | |
429 | while(pheap_count(&packets)) { | |
430 | struct packet *const p = pheap_first(&packets); | |
431 | if(le(p->timestamp + p->nsamples, next_timestamp)) { | |
432 | /* This packet is in the past. Drop it and try another one. */ | |
433 | drop_first_packet(); | |
434 | } else | |
435 | /* This packet is NOT in the past. (It might be in the future | |
436 | * however.) */ | |
437 | return p; | |
438 | } | |
439 | return 0; | |
440 | } | |
441 | ||
e83d0967 | 442 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H |
09ee2f0d | 443 | /** @brief Callback from Core Audio */ |
9086a105 RK |
444 | static OSStatus adioproc |
445 | (AudioDeviceID attribute((unused)) inDevice, | |
446 | const AudioTimeStamp attribute((unused)) *inNow, | |
447 | const AudioBufferList attribute((unused)) *inInputData, | |
448 | const AudioTimeStamp attribute((unused)) *inInputTime, | |
449 | AudioBufferList *outOutputData, | |
450 | const AudioTimeStamp attribute((unused)) *inOutputTime, | |
451 | void attribute((unused)) *inClientData) { | |
e83d0967 RK |
452 | UInt32 nbuffers = outOutputData->mNumberBuffers; |
453 | AudioBuffer *ab = outOutputData->mBuffers; | |
28bacdc0 | 454 | uint32_t samples_available; |
e83d0967 | 455 | |
0b75463f | 456 | pthread_mutex_lock(&lock); |
9086a105 RK |
457 | while(nbuffers > 0) { |
458 | float *samplesOut = ab->mData; | |
459 | size_t samplesOutLeft = ab->mDataByteSize / sizeof (float); | |
2c7c9eae | 460 | |
9086a105 | 461 | while(samplesOutLeft > 0) { |
5626f6d2 | 462 | const struct packet *p = next_packet(); |
28bacdc0 | 463 | if(p && contains(p, next_timestamp)) { |
58b5a68f | 464 | if(p->flags & IDLE) |
5626f6d2 | 465 | write(2, "I", 1); |
28bacdc0 RK |
466 | /* This packet is ready to play */ |
467 | const uint32_t packet_end = p->timestamp + p->nsamples; | |
468 | const uint32_t offset = next_timestamp - p->timestamp; | |
b64efe7e | 469 | const uint16_t *ptr = (void *)(p->samples_raw + offset); |
28bacdc0 RK |
470 | |
471 | samples_available = packet_end - next_timestamp; | |
472 | if(samples_available > samplesOutLeft) | |
473 | samples_available = samplesOutLeft; | |
474 | next_timestamp += samples_available; | |
475 | samplesOutLeft -= samples_available; | |
476 | while(samples_available-- > 0) | |
477 | *samplesOut++ = (int16_t)ntohs(*ptr++) * (0.5 / 32767); | |
478 | /* We don't bother junking the packet - that'll be dealt with next time | |
479 | * round */ | |
58b5a68f | 480 | write(2, ".", 1); |
28bacdc0 RK |
481 | } else { |
482 | /* No packet is ready to play (and there might be no packet at all) */ | |
483 | samples_available = p ? p->timestamp - next_timestamp | |
484 | : samplesOutLeft; | |
9086a105 RK |
485 | if(samples_available > samplesOutLeft) |
486 | samples_available = samplesOutLeft; | |
58b5a68f | 487 | //info("infill by %"PRIu32, samples_available); |
28bacdc0 | 488 | /* Conveniently the buffer is 0 to start with */ |
9086a105 RK |
489 | next_timestamp += samples_available; |
490 | samplesOut += samples_available; | |
491 | samplesOutLeft -= samples_available; | |
58b5a68f | 492 | write(2, "?", 1); |
9086a105 | 493 | } |
e83d0967 | 494 | } |
9086a105 RK |
495 | ++ab; |
496 | --nbuffers; | |
e83d0967 RK |
497 | } |
498 | pthread_mutex_unlock(&lock); | |
499 | return 0; | |
500 | } | |
501 | #endif | |
502 | ||
b64efe7e | 503 | |
504 | #if API_ALSA | |
505 | /** @brief PCM handle */ | |
506 | static snd_pcm_t *pcm; | |
507 | ||
508 | /** @brief True when @ref pcm is up and running */ | |
509 | static int alsa_prepared = 1; | |
510 | ||
511 | /** @brief Initialize @ref pcm */ | |
512 | static void setup_alsa(void) { | |
513 | snd_pcm_hw_params_t *hwparams; | |
514 | snd_pcm_sw_params_t *swparams; | |
515 | /* Only support one format for now */ | |
516 | const int sample_format = SND_PCM_FORMAT_S16_BE; | |
517 | unsigned rate = 44100; | |
518 | const int channels = 2; | |
519 | const int samplesize = channels * sizeof(uint16_t); | |
520 | snd_pcm_uframes_t pcm_bufsize = MAXSAMPLES * samplesize * 3; | |
521 | /* If we can write more than this many samples we'll get a wakeup */ | |
522 | const int avail_min = 256; | |
523 | int err; | |
524 | ||
525 | /* Open ALSA */ | |
526 | if((err = snd_pcm_open(&pcm, | |
527 | device ? device : "default", | |
528 | SND_PCM_STREAM_PLAYBACK, | |
529 | SND_PCM_NONBLOCK))) | |
530 | fatal(0, "error from snd_pcm_open: %d", err); | |
531 | /* Set up 'hardware' parameters */ | |
532 | snd_pcm_hw_params_alloca(&hwparams); | |
533 | if((err = snd_pcm_hw_params_any(pcm, hwparams)) < 0) | |
534 | fatal(0, "error from snd_pcm_hw_params_any: %d", err); | |
535 | if((err = snd_pcm_hw_params_set_access(pcm, hwparams, | |
536 | SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) | |
537 | fatal(0, "error from snd_pcm_hw_params_set_access: %d", err); | |
538 | if((err = snd_pcm_hw_params_set_format(pcm, hwparams, | |
539 | sample_format)) < 0) | |
540 | ||
541 | fatal(0, "error from snd_pcm_hw_params_set_format (%d): %d", | |
542 | sample_format, err); | |
543 | if((err = snd_pcm_hw_params_set_rate_near(pcm, hwparams, &rate, 0)) < 0) | |
544 | fatal(0, "error from snd_pcm_hw_params_set_rate (%d): %d", | |
545 | rate, err); | |
546 | if((err = snd_pcm_hw_params_set_channels(pcm, hwparams, | |
547 | channels)) < 0) | |
548 | fatal(0, "error from snd_pcm_hw_params_set_channels (%d): %d", | |
549 | channels, err); | |
550 | if((err = snd_pcm_hw_params_set_buffer_size_near(pcm, hwparams, | |
551 | &pcm_bufsize)) < 0) | |
552 | fatal(0, "error from snd_pcm_hw_params_set_buffer_size (%d): %d", | |
553 | MAXSAMPLES * samplesize * 3, err); | |
554 | if((err = snd_pcm_hw_params(pcm, hwparams)) < 0) | |
555 | fatal(0, "error calling snd_pcm_hw_params: %d", err); | |
556 | /* Set up 'software' parameters */ | |
557 | snd_pcm_sw_params_alloca(&swparams); | |
558 | if((err = snd_pcm_sw_params_current(pcm, swparams)) < 0) | |
559 | fatal(0, "error calling snd_pcm_sw_params_current: %d", err); | |
560 | if((err = snd_pcm_sw_params_set_avail_min(pcm, swparams, avail_min)) < 0) | |
561 | fatal(0, "error calling snd_pcm_sw_params_set_avail_min %d: %d", | |
562 | avail_min, err); | |
563 | if((err = snd_pcm_sw_params(pcm, swparams)) < 0) | |
564 | fatal(0, "error calling snd_pcm_sw_params: %d", err); | |
565 | } | |
566 | ||
567 | /** @brief Wait until ALSA wants some audio */ | |
568 | static void wait_alsa(void) { | |
569 | struct pollfd fds[64]; | |
570 | int nfds, err; | |
571 | unsigned short events; | |
572 | ||
573 | for(;;) { | |
574 | do { | |
575 | if((nfds = snd_pcm_poll_descriptors(pcm, | |
576 | fds, sizeof fds / sizeof *fds)) < 0) | |
577 | fatal(0, "error calling snd_pcm_poll_descriptors: %d", nfds); | |
578 | } while(poll(fds, nfds, -1) < 0 && errno == EINTR); | |
579 | if((err = snd_pcm_poll_descriptors_revents(pcm, fds, nfds, &events))) | |
580 | fatal(0, "error calling snd_pcm_poll_descriptors_revents: %d", err); | |
581 | if(events & POLLOUT) | |
582 | return; | |
583 | } | |
584 | } | |
585 | ||
b0fdc63d | 586 | /** @brief Play some sound via ALSA |
b64efe7e | 587 | * @param s Pointer to sample data |
588 | * @param n Number of samples | |
589 | * @return 0 on success, -1 on non-fatal error | |
590 | */ | |
591 | static int alsa_writei(const void *s, size_t n) { | |
592 | /* Do the write */ | |
593 | const snd_pcm_sframes_t frames_written = snd_pcm_writei(pcm, s, n / 2); | |
594 | if(frames_written < 0) { | |
595 | /* Something went wrong */ | |
596 | switch(frames_written) { | |
597 | case -EAGAIN: | |
b0fdc63d | 598 | write(2, "#", 1); |
b64efe7e | 599 | return 0; |
600 | case -EPIPE: | |
601 | error(0, "error calling snd_pcm_writei: %ld", | |
602 | (long)frames_written); | |
603 | return -1; | |
604 | default: | |
605 | fatal(0, "error calling snd_pcm_writei: %ld", | |
606 | (long)frames_written); | |
607 | } | |
608 | } else { | |
609 | /* Success */ | |
610 | next_timestamp += frames_written * 2; | |
611 | return 0; | |
612 | } | |
613 | } | |
614 | ||
615 | /** @brief Play the relevant part of a packet | |
616 | * @param p Packet to play | |
617 | * @return 0 on success, -1 on non-fatal error | |
618 | */ | |
619 | static int alsa_play(const struct packet *p) { | |
b0fdc63d | 620 | if(p->flags & IDLE) |
621 | write(2, "I", 1); | |
b64efe7e | 622 | write(2, ".", 1); |
623 | return alsa_writei(p->samples_raw + next_timestamp - p->timestamp, | |
624 | (p->timestamp + p->nsamples) - next_timestamp); | |
625 | } | |
626 | ||
627 | /** @brief Play some silence | |
628 | * @param p Next packet or NULL | |
629 | * @return 0 on success, -1 on non-fatal error | |
630 | */ | |
631 | static int alsa_infill(const struct packet *p) { | |
632 | static const uint16_t zeros[INFILL_SAMPLES]; | |
633 | size_t samples_available = INFILL_SAMPLES; | |
634 | ||
635 | if(p && samples_available > p->timestamp - next_timestamp) | |
636 | samples_available = p->timestamp - next_timestamp; | |
637 | write(2, "?", 1); | |
638 | return alsa_writei(zeros, samples_available); | |
639 | } | |
640 | ||
641 | /** @brief Reset ALSA state after we lost synchronization */ | |
642 | static void alsa_reset(int hard_reset) { | |
643 | int err; | |
644 | ||
645 | if((err = snd_pcm_nonblock(pcm, 0))) | |
646 | fatal(0, "error calling snd_pcm_nonblock: %d", err); | |
647 | if(hard_reset) { | |
648 | if((err = snd_pcm_drop(pcm))) | |
649 | fatal(0, "error calling snd_pcm_drop: %d", err); | |
650 | } else | |
651 | if((err = snd_pcm_drain(pcm))) | |
652 | fatal(0, "error calling snd_pcm_drain: %d", err); | |
653 | if((err = snd_pcm_nonblock(pcm, 1))) | |
654 | fatal(0, "error calling snd_pcm_nonblock: %d", err); | |
655 | alsa_prepared = 0; | |
656 | } | |
657 | #endif | |
658 | ||
09ee2f0d | 659 | /** @brief Play an RTP stream |
660 | * | |
661 | * This is the guts of the program. It is responsible for: | |
662 | * - starting the listening thread | |
663 | * - opening the audio device | |
664 | * - reading ahead to build up a buffer | |
665 | * - arranging for audio to be played | |
666 | * - detecting when the buffer has got too small and re-buffering | |
667 | */ | |
0b75463f | 668 | static void play_rtp(void) { |
669 | pthread_t ltid; | |
e83d0967 RK |
670 | |
671 | /* We receive and convert audio data in a background thread */ | |
0b75463f | 672 | pthread_create(<id, 0, listen_thread, 0); |
e83d0967 | 673 | #if API_ALSA |
0b75463f | 674 | { |
b64efe7e | 675 | struct packet *p; |
676 | int escape, err; | |
677 | ||
678 | /* Open the sound device */ | |
679 | setup_alsa(); | |
0b75463f | 680 | pthread_mutex_lock(&lock); |
681 | for(;;) { | |
682 | /* Wait for the buffer to fill up a bit */ | |
b64efe7e | 683 | fill_buffer(); |
684 | if(!alsa_prepared) { | |
0b75463f | 685 | if((err = snd_pcm_prepare(pcm))) |
686 | fatal(0, "error calling snd_pcm_prepare: %d", err); | |
b64efe7e | 687 | alsa_prepared = 1; |
0b75463f | 688 | } |
c0e41690 | 689 | escape = 0; |
ed13cbc8 | 690 | info("Playing..."); |
b64efe7e | 691 | /* Keep playing until the buffer empties out, or ALSA tells us to get |
692 | * lost */ | |
c0e41690 | 693 | while(nsamples >= minbuffer && !escape) { |
0b75463f | 694 | /* Wait for ALSA to ask us for more data */ |
695 | pthread_mutex_unlock(&lock); | |
b64efe7e | 696 | wait_alsa(); |
0b75463f | 697 | pthread_mutex_lock(&lock); |
b64efe7e | 698 | /* ALSA is ready for more data, find something to play */ |
699 | p = next_packet(); | |
700 | /* Play it or play some silence */ | |
701 | if(contains(p, next_timestamp)) | |
702 | escape = alsa_play(p); | |
703 | else | |
704 | escape = alsa_infill(p); | |
0b75463f | 705 | } |
09ee2f0d | 706 | active = 0; |
0b75463f | 707 | /* We stop playing for a bit until the buffer re-fills */ |
708 | pthread_mutex_unlock(&lock); | |
b64efe7e | 709 | alsa_reset(escape); |
0b75463f | 710 | pthread_mutex_lock(&lock); |
711 | } | |
712 | ||
713 | } | |
e83d0967 RK |
714 | #elif HAVE_COREAUDIO_AUDIOHARDWARE_H |
715 | { | |
716 | OSStatus status; | |
717 | UInt32 propertySize; | |
718 | AudioDeviceID adid; | |
719 | AudioStreamBasicDescription asbd; | |
720 | ||
721 | /* If this looks suspiciously like libao's macosx driver there's an | |
722 | * excellent reason for that... */ | |
723 | ||
724 | /* TODO report errors as strings not numbers */ | |
725 | propertySize = sizeof adid; | |
726 | status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, | |
727 | &propertySize, &adid); | |
728 | if(status) | |
729 | fatal(0, "AudioHardwareGetProperty: %d", (int)status); | |
730 | if(adid == kAudioDeviceUnknown) | |
731 | fatal(0, "no output device"); | |
732 | propertySize = sizeof asbd; | |
733 | status = AudioDeviceGetProperty(adid, 0, false, | |
734 | kAudioDevicePropertyStreamFormat, | |
735 | &propertySize, &asbd); | |
736 | if(status) | |
737 | fatal(0, "AudioHardwareGetProperty: %d", (int)status); | |
738 | D(("mSampleRate %f", asbd.mSampleRate)); | |
9086a105 RK |
739 | D(("mFormatID %08lx", asbd.mFormatID)); |
740 | D(("mFormatFlags %08lx", asbd.mFormatFlags)); | |
741 | D(("mBytesPerPacket %08lx", asbd.mBytesPerPacket)); | |
742 | D(("mFramesPerPacket %08lx", asbd.mFramesPerPacket)); | |
743 | D(("mBytesPerFrame %08lx", asbd.mBytesPerFrame)); | |
744 | D(("mChannelsPerFrame %08lx", asbd.mChannelsPerFrame)); | |
745 | D(("mBitsPerChannel %08lx", asbd.mBitsPerChannel)); | |
746 | D(("mReserved %08lx", asbd.mReserved)); | |
e83d0967 RK |
747 | if(asbd.mFormatID != kAudioFormatLinearPCM) |
748 | fatal(0, "audio device does not support kAudioFormatLinearPCM"); | |
749 | status = AudioDeviceAddIOProc(adid, adioproc, 0); | |
750 | if(status) | |
751 | fatal(0, "AudioDeviceAddIOProc: %d", (int)status); | |
752 | pthread_mutex_lock(&lock); | |
753 | for(;;) { | |
754 | /* Wait for the buffer to fill up a bit */ | |
b64efe7e | 755 | fill_buffer(); |
e83d0967 | 756 | /* Start playing now */ |
8dcb5ff0 | 757 | info("Playing..."); |
28bacdc0 | 758 | next_timestamp = pheap_first(&packets)->timestamp; |
8dcb5ff0 | 759 | active = 1; |
e83d0967 RK |
760 | status = AudioDeviceStart(adid, adioproc); |
761 | if(status) | |
762 | fatal(0, "AudioDeviceStart: %d", (int)status); | |
763 | /* Wait until the buffer empties out */ | |
1153fd23 | 764 | while(nsamples >= minbuffer) |
e83d0967 RK |
765 | pthread_cond_wait(&cond, &lock); |
766 | /* Stop playing for a bit until the buffer re-fills */ | |
767 | status = AudioDeviceStop(adid, adioproc); | |
768 | if(status) | |
769 | fatal(0, "AudioDeviceStop: %d", (int)status); | |
8dcb5ff0 | 770 | active = 0; |
e83d0967 RK |
771 | /* Go back round */ |
772 | } | |
773 | } | |
774 | #else | |
775 | # error No known audio API | |
776 | #endif | |
777 | } | |
778 | ||
779 | /* display usage message and terminate */ | |
780 | static void help(void) { | |
781 | xprintf("Usage:\n" | |
782 | " disorder-playrtp [OPTIONS] ADDRESS [PORT]\n" | |
783 | "Options:\n" | |
1153fd23 | 784 | " --device, -D DEVICE Output device\n" |
785 | " --min, -m FRAMES Buffer low water mark\n" | |
9086a105 RK |
786 | " --buffer, -b FRAMES Buffer high water mark\n" |
787 | " --max, -x FRAMES Buffer maximum size\n" | |
788 | " --help, -h Display usage message\n" | |
789 | " --version, -V Display version number\n" | |
790 | ); | |
e83d0967 RK |
791 | xfclose(stdout); |
792 | exit(0); | |
793 | } | |
794 | ||
795 | /* display version number and terminate */ | |
796 | static void version(void) { | |
797 | xprintf("disorder-playrtp version %s\n", disorder_version_string); | |
798 | xfclose(stdout); | |
799 | exit(0); | |
800 | } | |
801 | ||
802 | int main(int argc, char **argv) { | |
803 | int n; | |
804 | struct addrinfo *res; | |
805 | struct stringlist sl; | |
0b75463f | 806 | char *sockname; |
e83d0967 | 807 | |
0b75463f | 808 | static const struct addrinfo prefs = { |
e83d0967 RK |
809 | AI_PASSIVE, |
810 | PF_INET, | |
811 | SOCK_DGRAM, | |
812 | IPPROTO_UDP, | |
813 | 0, | |
814 | 0, | |
815 | 0, | |
816 | 0 | |
817 | }; | |
818 | ||
819 | mem_init(); | |
820 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale"); | |
345ebe66 | 821 | while((n = getopt_long(argc, argv, "hVdD:m:b:x:L:", options, 0)) >= 0) { |
e83d0967 RK |
822 | switch(n) { |
823 | case 'h': help(); | |
824 | case 'V': version(); | |
825 | case 'd': debugging = 1; break; | |
0b75463f | 826 | case 'D': device = optarg; break; |
1153fd23 | 827 | case 'm': minbuffer = 2 * atol(optarg); break; |
828 | case 'b': readahead = 2 * atol(optarg); break; | |
9086a105 | 829 | case 'x': maxbuffer = 2 * atol(optarg); break; |
345ebe66 | 830 | case 'L': logfp = fopen(optarg, "w"); break; |
e83d0967 RK |
831 | default: fatal(0, "invalid option"); |
832 | } | |
833 | } | |
9086a105 RK |
834 | if(!maxbuffer) |
835 | maxbuffer = 4 * readahead; | |
e83d0967 RK |
836 | argc -= optind; |
837 | argv += optind; | |
838 | if(argc < 1 || argc > 2) | |
839 | fatal(0, "usage: disorder-playrtp [OPTIONS] ADDRESS [PORT]"); | |
840 | sl.n = argc; | |
841 | sl.s = argv; | |
842 | /* Listen for inbound audio data */ | |
0b75463f | 843 | if(!(res = get_address(&sl, &prefs, &sockname))) |
e83d0967 RK |
844 | exit(1); |
845 | if((rtpfd = socket(res->ai_family, | |
846 | res->ai_socktype, | |
847 | res->ai_protocol)) < 0) | |
848 | fatal(errno, "error creating socket"); | |
849 | if(bind(rtpfd, res->ai_addr, res->ai_addrlen) < 0) | |
850 | fatal(errno, "error binding socket to %s", sockname); | |
851 | play_rtp(); | |
852 | return 0; | |
853 | } | |
854 | ||
855 | /* | |
856 | Local Variables: | |
857 | c-basic-offset:2 | |
858 | comment-column:40 | |
859 | fill-column:79 | |
860 | indent-tabs-mode:nil | |
861 | End: | |
862 | */ |