| 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 | */ |
| 20 | |
| 21 | #include <config.h> |
| 22 | #include "types.h" |
| 23 | |
| 24 | #include <getopt.h> |
| 25 | #include <stdio.h> |
| 26 | #include <stdlib.h> |
| 27 | #include <sys/socket.h> |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/socket.h> |
| 30 | #include <netdb.h> |
| 31 | #include <pthread.h> |
| 32 | |
| 33 | #include "log.h" |
| 34 | #include "mem.h" |
| 35 | #include "configuration.h" |
| 36 | #include "addr.h" |
| 37 | #include "syscalls.h" |
| 38 | #include "rtp.h" |
| 39 | #include "debug.h" |
| 40 | |
| 41 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H |
| 42 | # include <CoreAudio/AudioHardware.h> |
| 43 | #endif |
| 44 | |
| 45 | static int rtpfd; |
| 46 | |
| 47 | #define MAXSAMPLES 2048 /* max samples/frame we'll support */ |
| 48 | /* NB two channels = two samples in this program! */ |
| 49 | #define MINBUFFER 8820 /* when to stop playing */ |
| 50 | #define READAHEAD 88200 /* how far to read ahead */ |
| 51 | #define MAXBUFFER (3 * 88200) /* maximum buffer contents */ |
| 52 | |
| 53 | struct frame { |
| 54 | struct frame *next; /* another frame */ |
| 55 | int nsamples; /* number of samples */ |
| 56 | int nused; /* number of samples used so far */ |
| 57 | uint32_t timestamp; /* timestamp from packet */ |
| 58 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H |
| 59 | float samples[MAXSAMPLES]; /* converted sample data */ |
| 60 | #endif |
| 61 | }; |
| 62 | |
| 63 | static unsigned long nsamples; /* total samples available */ |
| 64 | |
| 65 | static struct frame *frames; /* received frames in ascending order |
| 66 | * of timestamp */ |
| 67 | static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; |
| 68 | /* lock protecting frame list */ |
| 69 | |
| 70 | static pthread_cond_t cond = PTHREAD_CONDVAR_INITIALIZER; |
| 71 | /* signalled whenever we add a new frame */ |
| 72 | |
| 73 | static const struct option options[] = { |
| 74 | { "help", no_argument, 0, 'h' }, |
| 75 | { "version", no_argument, 0, 'V' }, |
| 76 | { "debug", no_argument, 0, 'd' }, |
| 77 | { 0, 0, 0, 0 } |
| 78 | }; |
| 79 | |
| 80 | /* Return true iff a > b in sequence-space arithmetic */ |
| 81 | static inline int gt(const struct frame *a, const struct frame *b) { |
| 82 | return (uint32_t)(a->timestamp - b->timestamp) < 0x80000000; |
| 83 | } |
| 84 | |
| 85 | /* Background thread that reads frames over the network and add them to the |
| 86 | * list */ |
| 87 | static listen_thread(void attribute((unused)) *arg) { |
| 88 | struct frame *f = 0, **ff; |
| 89 | int n, i; |
| 90 | union { |
| 91 | struct rtp_header header; |
| 92 | uint8_t bytes[sizeof(uint16_t) * MAXSAMPLES + sizeof (struct rtp_header)]; |
| 93 | } packet; |
| 94 | const uint16_t *const samples = (uint16_t *)(packet.bytes |
| 95 | + sizeof (struct rtp_header)); |
| 96 | |
| 97 | for(;;) { |
| 98 | if(!f) |
| 99 | f = xmalloc(sizeof *f); |
| 100 | n = read(rtpfd, packet.bytes, sizeof packet.bytes); |
| 101 | if(n < 0) { |
| 102 | switch(errno) { |
| 103 | case EINTR: |
| 104 | continue; |
| 105 | default: |
| 106 | fatal(errno, "error reading from socket"); |
| 107 | } |
| 108 | } |
| 109 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H |
| 110 | /* Convert to target format */ |
| 111 | switch(packet.header.mtp & 0x7F) { |
| 112 | case 10: |
| 113 | f->nsamples = (n - sizeof (struct rtp_header)) / sizeof(uint16_t); |
| 114 | for(i = 0; i < f->nsamples; ++i) |
| 115 | f->samples[i] = (int16_t)ntohs(samples[i]) * (0.5f / 32767); |
| 116 | break; |
| 117 | /* TODO support other RFC3551 media types (when the speaker does) */ |
| 118 | default: |
| 119 | fatal(0, "unsupported RTP payload type %d", |
| 120 | packet.header.mpt & 0x7F); |
| 121 | } |
| 122 | #endif |
| 123 | f->used = 0; |
| 124 | f->timestamp = ntohl(packet.header.timestamp); |
| 125 | pthread_mutex_lock(&lock); |
| 126 | /* Stop reading if we've reached the maximum */ |
| 127 | while(nsamples >= MAXBUFFER) |
| 128 | pthread_cond_wait(&cond, &lock); |
| 129 | for(ff = &frames; *ff && !gt(*ff, f); ff = &(*ff)->next) |
| 130 | ; |
| 131 | f->next = *ff; |
| 132 | *ff = f; |
| 133 | nsamples += f->nsamples; |
| 134 | pthread_cond_broadcast(&cond); |
| 135 | pthread_mutex_unlock(&lock); |
| 136 | f = 0; |
| 137 | } |
| 138 | } |
| 139 | |
| 140 | #if HAVE_COREAUDIO_AUDIOHARDWARE_H |
| 141 | static OSStatus adioproc(AudioDeviceID inDevice, |
| 142 | const AudioTimeStamp *inNow, |
| 143 | const AudioBufferList *inInputData, |
| 144 | const AudioTimeStamp *inInputTime, |
| 145 | AudioBufferList *outOutputData, |
| 146 | const AudioTimeStamp *inOutputTime, |
| 147 | void *inClientData) { |
| 148 | UInt32 nbuffers = outOutputData->mNumberBuffers; |
| 149 | AudioBuffer *ab = outOutputData->mBuffers; |
| 150 | float *samplesOut; /* where to write samples to */ |
| 151 | size_t samplesOutLeft; /* space left */ |
| 152 | size_t samplesInLeft; |
| 153 | size_t samplesToCopy; |
| 154 | |
| 155 | pthread_mutex_lock(&lock); |
| 156 | samplesOut = ab->data; |
| 157 | samplesOutLeft = ab->mDataByteSize / sizeof (float); |
| 158 | while(frames && nbuffers > 0) { |
| 159 | if(frames->used == frames->nsamples) { |
| 160 | /* TODO if we dropped a packet then we should introduce a gap here */ |
| 161 | struct frame *const f = frames; |
| 162 | frames = f->next; |
| 163 | free(f); |
| 164 | pthread_cond_broadcast(&cond); |
| 165 | continue; |
| 166 | } |
| 167 | if(samplesOutLeft == 0) { |
| 168 | --nbuffers; |
| 169 | ++ab; |
| 170 | samplesOut = ab->data; |
| 171 | samplesOutLeft = ab->mDataByteSize / sizeof (float); |
| 172 | continue; |
| 173 | } |
| 174 | /* Now: (1) there is some data left to read |
| 175 | * (2) there is some space to put it */ |
| 176 | samplesInLeft = frames->nsamples - frames->used; |
| 177 | samplesToCopy = (samplesInLeft < samplesOutLeft |
| 178 | ? samplesInLeft : samplesOutLeft); |
| 179 | memcpy(samplesOut, frame->samples + frames->used, samplesToCopy); |
| 180 | frames->used += samplesToCopy; |
| 181 | samplesOut += samplesToCopy; |
| 182 | samesOutLeft -= samplesToCopy; |
| 183 | } |
| 184 | pthread_mutex_unlock(&lock); |
| 185 | return 0; |
| 186 | } |
| 187 | #endif |
| 188 | |
| 189 | void play_rtp(void) { |
| 190 | pthread_t lt; |
| 191 | |
| 192 | /* We receive and convert audio data in a background thread */ |
| 193 | pthread_create(<, 0, listen_thread, 0); |
| 194 | #if API_ALSA |
| 195 | assert(!"implemented"); |
| 196 | #elif HAVE_COREAUDIO_AUDIOHARDWARE_H |
| 197 | { |
| 198 | OSStatus status; |
| 199 | UInt32 propertySize; |
| 200 | AudioDeviceID adid; |
| 201 | AudioStreamBasicDescription asbd; |
| 202 | |
| 203 | /* If this looks suspiciously like libao's macosx driver there's an |
| 204 | * excellent reason for that... */ |
| 205 | |
| 206 | /* TODO report errors as strings not numbers */ |
| 207 | propertySize = sizeof adid; |
| 208 | status = AudioHardwareGetProperty(kAudioHardwarePropertyDefaultOutputDevice, |
| 209 | &propertySize, &adid); |
| 210 | if(status) |
| 211 | fatal(0, "AudioHardwareGetProperty: %d", (int)status); |
| 212 | if(adid == kAudioDeviceUnknown) |
| 213 | fatal(0, "no output device"); |
| 214 | propertySize = sizeof asbd; |
| 215 | status = AudioDeviceGetProperty(adid, 0, false, |
| 216 | kAudioDevicePropertyStreamFormat, |
| 217 | &propertySize, &asbd); |
| 218 | if(status) |
| 219 | fatal(0, "AudioHardwareGetProperty: %d", (int)status); |
| 220 | D(("mSampleRate %f", asbd.mSampleRate)); |
| 221 | D(("mFormatID %08"PRIx32, asbd.mFormatID)); |
| 222 | D(("mFormatFlags %08"PRIx32, asbd.mFormatFlags)); |
| 223 | D(("mBytesPerPacket %08"PRIx32, asbd.mBytesPerPacket)); |
| 224 | D(("mFramesPerPacket %08"PRIx32, asbd.mFramesPerPacket)); |
| 225 | D(("mBytesPerFrame %08"PRIx32, asbd.mBytesPerFrame)); |
| 226 | D(("mChannelsPerFrame %08"PRIx32, asbd.mChannelsPerFrame)); |
| 227 | D(("mBitsPerChannel %08"PRIx32, asbd.mBitsPerChannel)); |
| 228 | D(("mReserved %08"PRIx32, asbd.mReserved)); |
| 229 | if(asbd.mFormatID != kAudioFormatLinearPCM) |
| 230 | fatal(0, "audio device does not support kAudioFormatLinearPCM"); |
| 231 | status = AudioDeviceAddIOProc(adid, adioproc, 0); |
| 232 | if(status) |
| 233 | fatal(0, "AudioDeviceAddIOProc: %d", (int)status); |
| 234 | pthread_mutex_lock(&lock); |
| 235 | for(;;) { |
| 236 | /* Wait for the buffer to fill up a bit */ |
| 237 | while(nsamples < READAHEAD) |
| 238 | pthread_cond_wait(&cond, &lock); |
| 239 | /* Start playing now */ |
| 240 | status = AudioDeviceStart(adid, adioproc); |
| 241 | if(status) |
| 242 | fatal(0, "AudioDeviceStart: %d", (int)status); |
| 243 | /* Wait until the buffer empties out */ |
| 244 | while(nsamples >= MINBUFFER) |
| 245 | pthread_cond_wait(&cond, &lock); |
| 246 | /* Stop playing for a bit until the buffer re-fills */ |
| 247 | status = AudioDeviceStop(adid, adioproc); |
| 248 | if(status) |
| 249 | fatal(0, "AudioDeviceStop: %d", (int)status); |
| 250 | /* Go back round */ |
| 251 | } |
| 252 | } |
| 253 | #else |
| 254 | # error No known audio API |
| 255 | #endif |
| 256 | } |
| 257 | |
| 258 | /* display usage message and terminate */ |
| 259 | static void help(void) { |
| 260 | xprintf("Usage:\n" |
| 261 | " disorder-playrtp [OPTIONS] ADDRESS [PORT]\n" |
| 262 | "Options:\n" |
| 263 | " --help, -h Display usage message\n" |
| 264 | " --version, -V Display version number\n" |
| 265 | " --debug, -d Turn on debugging\n"); |
| 266 | xfclose(stdout); |
| 267 | exit(0); |
| 268 | } |
| 269 | |
| 270 | /* display version number and terminate */ |
| 271 | static void version(void) { |
| 272 | xprintf("disorder-playrtp version %s\n", disorder_version_string); |
| 273 | xfclose(stdout); |
| 274 | exit(0); |
| 275 | } |
| 276 | |
| 277 | int main(int argc, char **argv) { |
| 278 | int n; |
| 279 | struct addrinfo *res; |
| 280 | struct stringlist sl; |
| 281 | const char *sockname; |
| 282 | |
| 283 | static const struct addrinfo prefbind = { |
| 284 | AI_PASSIVE, |
| 285 | PF_INET, |
| 286 | SOCK_DGRAM, |
| 287 | IPPROTO_UDP, |
| 288 | 0, |
| 289 | 0, |
| 290 | 0, |
| 291 | 0 |
| 292 | }; |
| 293 | |
| 294 | mem_init(); |
| 295 | if(!setlocale(LC_CTYPE, "")) fatal(errno, "error calling setlocale"); |
| 296 | while((n = getopt_long(argc, argv, "hVd", options, 0)) >= 0) { |
| 297 | switch(n) { |
| 298 | case 'h': help(); |
| 299 | case 'V': version(); |
| 300 | case 'd': debugging = 1; break; |
| 301 | default: fatal(0, "invalid option"); |
| 302 | } |
| 303 | } |
| 304 | argc -= optind; |
| 305 | argv += optind; |
| 306 | if(argc < 1 || argc > 2) |
| 307 | fatal(0, "usage: disorder-playrtp [OPTIONS] ADDRESS [PORT]"); |
| 308 | sl.n = argc; |
| 309 | sl.s = argv; |
| 310 | /* Listen for inbound audio data */ |
| 311 | if(!(res = get_address(&sl, &pref, &sockname))) |
| 312 | exit(1); |
| 313 | if((rtpfd = socket(res->ai_family, |
| 314 | res->ai_socktype, |
| 315 | res->ai_protocol)) < 0) |
| 316 | fatal(errno, "error creating socket"); |
| 317 | if(bind(rtpfd, res->ai_addr, res->ai_addrlen) < 0) |
| 318 | fatal(errno, "error binding socket to %s", sockname); |
| 319 | play_rtp(); |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | /* |
| 324 | Local Variables: |
| 325 | c-basic-offset:2 |
| 326 | comment-column:40 |
| 327 | fill-column:79 |
| 328 | indent-tabs-mode:nil |
| 329 | End: |
| 330 | */ |