| 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 | /** @file clients/playrtp-oss.c |
| 21 | * @brief RTP player - OSS and empeg support |
| 22 | */ |
| 23 | |
| 24 | #include <config.h> |
| 25 | |
| 26 | #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST |
| 27 | #include "types.h" |
| 28 | |
| 29 | #include <poll.h> |
| 30 | #include <sys/ioctl.h> |
| 31 | #if !EMPEG_HOST |
| 32 | #include <sys/soundcard.h> |
| 33 | #endif |
| 34 | #include <assert.h> |
| 35 | #include <pthread.h> |
| 36 | #include <string.h> |
| 37 | #include <fcntl.h> |
| 38 | #include <unistd.h> |
| 39 | #include <errno.h> |
| 40 | |
| 41 | #include "mem.h" |
| 42 | #include "log.h" |
| 43 | #include "vector.h" |
| 44 | #include "heap.h" |
| 45 | #include "syscalls.h" |
| 46 | #include "playrtp.h" |
| 47 | |
| 48 | /** @brief /dev/dsp (or whatever) */ |
| 49 | static int playrtp_oss_fd = -1; |
| 50 | |
| 51 | /** @brief Audio buffer */ |
| 52 | static char *playrtp_oss_buffer; |
| 53 | |
| 54 | /** @brief Size of @ref playrtp_oss_buffer in bytes */ |
| 55 | static int playrtp_oss_bufsize; |
| 56 | |
| 57 | /** @brief Number of bytes used in @ref playrtp_oss_buffer */ |
| 58 | static int playrtp_oss_bufused; |
| 59 | |
| 60 | /** @brief Open and configure the OSS audio device */ |
| 61 | static void playrtp_oss_enable(void) { |
| 62 | if(playrtp_oss_fd == -1) { |
| 63 | #if EMPEG_HOST |
| 64 | /* empeg audio driver only knows /dev/audio, only supports the equivalent |
| 65 | * of AFMT_S16_NE, has a fixed buffer size, and does not support the |
| 66 | * SNDCTL_ ioctls. */ |
| 67 | if(!device) |
| 68 | device = "/dev/audio"; |
| 69 | if((playrtp_oss_fd = open(device, O_WRONLY)) < 0) |
| 70 | fatal(errno, "error opening %s", device); |
| 71 | playrtp_oss_bufsize = 4608; |
| 72 | #else |
| 73 | int rate = 44100, stereo = 1, format = AFMT_S16_BE; |
| 74 | if(!device) { |
| 75 | if(access("/dev/dsp", W_OK) == 0) |
| 76 | device = "/dev/dsp"; |
| 77 | else if(access("/dev/audio", W_OK) == 0) |
| 78 | device = "/dev/audio"; |
| 79 | else |
| 80 | fatal(0, "cannot determine default audio device"); |
| 81 | } |
| 82 | if((playrtp_oss_fd = open(device, O_WRONLY)) < 0) |
| 83 | fatal(errno, "error opening %s", device); |
| 84 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_SETFMT, &format) < 0) |
| 85 | fatal(errno, "ioctl SNDCTL_DSP_SETFMT"); |
| 86 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_STEREO, &stereo) < 0) |
| 87 | fatal(errno, "ioctl SNDCTL_DSP_STEREO"); |
| 88 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_SPEED, &rate) < 0) |
| 89 | fatal(errno, "ioctl SNDCTL_DSP_SPEED"); |
| 90 | if(rate != 44100) |
| 91 | error(0, "asking for 44100Hz, got %dHz", rate); |
| 92 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_GETBLKSIZE, &playrtp_oss_bufsize) < 0) |
| 93 | fatal(errno, "ioctl SNDCTL_DSP_GETBLKSIZE"); |
| 94 | info("OSS buffer size %d", playrtp_oss_bufsize); |
| 95 | #endif |
| 96 | playrtp_oss_buffer = xmalloc(playrtp_oss_bufsize); |
| 97 | playrtp_oss_bufused = 0; |
| 98 | nonblock(playrtp_oss_fd); |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /** @brief Flush the OSS output buffer |
| 103 | * @return 0 on success, non-0 on error |
| 104 | */ |
| 105 | static int playrtp_oss_flush(void) { |
| 106 | int nbyteswritten; |
| 107 | |
| 108 | if(!playrtp_oss_bufused) |
| 109 | return 0; /* nothing to do */ |
| 110 | /* 0 out the unused portion of the buffer */ |
| 111 | memset(playrtp_oss_buffer + playrtp_oss_bufused, 0, |
| 112 | playrtp_oss_bufsize - playrtp_oss_bufused); |
| 113 | #if EMPEG_HOST |
| 114 | /* empeg audio driver insists on native-endian samples */ |
| 115 | { |
| 116 | uint16_t *ptr, |
| 117 | *const limit = (uint16_t *)(playrtp_oss_buffer + playrtp_oss_bufused); |
| 118 | |
| 119 | for(ptr = (uint16_t *)playrtp_oss_buffer; ptr < limit; ++ptr) |
| 120 | *ptr = ntohs(*ptr); |
| 121 | } |
| 122 | #endif |
| 123 | for(;;) { |
| 124 | nbyteswritten = write(playrtp_oss_fd, |
| 125 | playrtp_oss_buffer, playrtp_oss_bufsize); |
| 126 | if(nbyteswritten < 0) { |
| 127 | switch(errno) { |
| 128 | case EINTR: |
| 129 | break; /* try again */ |
| 130 | case EAGAIN: |
| 131 | return 0; /* try later */ |
| 132 | default: |
| 133 | error(errno, "error writing to %s", device); |
| 134 | return -1; |
| 135 | } |
| 136 | } else { |
| 137 | if(nbyteswritten < playrtp_oss_bufsize) |
| 138 | error(0, "%s: short write (%d/%d)", |
| 139 | device, nbyteswritten, playrtp_oss_bufsize); |
| 140 | playrtp_oss_bufused = 0; |
| 141 | return 0; |
| 142 | } |
| 143 | } |
| 144 | } |
| 145 | |
| 146 | /** @brief Wait until the audio device can accept more data */ |
| 147 | static void playrtp_oss_wait(void) { |
| 148 | struct pollfd fds[1]; |
| 149 | int n; |
| 150 | |
| 151 | do { |
| 152 | fds[0].fd = playrtp_oss_fd; |
| 153 | fds[0].events = POLLOUT; |
| 154 | while((n = poll(fds, 1, -1)) < 0 && errno == EINTR) |
| 155 | ; |
| 156 | if(n < 0) |
| 157 | fatal(errno, "calling poll"); |
| 158 | } while(!(fds[0].revents & (POLLOUT|POLLERR))); |
| 159 | } |
| 160 | |
| 161 | /** @brief Close the OSS output device |
| 162 | * @param hard If nonzero, drop pending data |
| 163 | */ |
| 164 | static void playrtp_oss_disable(int hard) { |
| 165 | if(hard) { |
| 166 | #if !EMPEG_HOST |
| 167 | /* No SNDCTL_DSP_ ioctls on empeg */ |
| 168 | if(ioctl(playrtp_oss_fd, SNDCTL_DSP_RESET, 0) < 0) |
| 169 | error(errno, "ioctl SNDCTL_DSP_RESET"); |
| 170 | #endif |
| 171 | } else |
| 172 | playrtp_oss_flush(); |
| 173 | xclose(playrtp_oss_fd); |
| 174 | playrtp_oss_fd = -1; |
| 175 | free(playrtp_oss_buffer); |
| 176 | playrtp_oss_buffer = 0; |
| 177 | } |
| 178 | |
| 179 | /** @brief Write samples to OSS output device |
| 180 | * @param data Pointer to sample data |
| 181 | * @param nsamples Number of samples |
| 182 | * @return 0 on success, non-0 on error |
| 183 | */ |
| 184 | static int playrtp_oss_write(const char *data, size_t samples) { |
| 185 | long bytes = samples * sizeof(int16_t); |
| 186 | while(bytes > 0) { |
| 187 | int n = playrtp_oss_bufsize - playrtp_oss_bufused; |
| 188 | |
| 189 | if(n > bytes) |
| 190 | n = bytes; |
| 191 | memcpy(playrtp_oss_buffer + playrtp_oss_bufused, data, n); |
| 192 | bytes -= n; |
| 193 | data += n; |
| 194 | playrtp_oss_bufused += n; |
| 195 | if(playrtp_oss_bufused == playrtp_oss_bufsize) |
| 196 | if(playrtp_oss_flush()) |
| 197 | return -1; |
| 198 | } |
| 199 | next_timestamp += samples; |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | /** @brief Play some data from packet @p p |
| 204 | * |
| 205 | * @p p is assumed to contain @ref next_timestamp. |
| 206 | */ |
| 207 | static int playrtp_oss_play(const struct packet *p) { |
| 208 | return playrtp_oss_write |
| 209 | ((const char *)(p->samples_raw + next_timestamp - p->timestamp), |
| 210 | (p->timestamp + p->nsamples) - next_timestamp); |
| 211 | } |
| 212 | |
| 213 | /** @brief Play some silence before packet @p p |
| 214 | * |
| 215 | * @p p is assumed to be entirely before @ref next_timestamp. |
| 216 | */ |
| 217 | static int playrtp_oss_infill(const struct packet *p) { |
| 218 | static const char zeros[INFILL_SAMPLES * sizeof(int16_t)]; |
| 219 | size_t samples_available = INFILL_SAMPLES; |
| 220 | |
| 221 | if(p && samples_available > p->timestamp - next_timestamp) |
| 222 | samples_available = p->timestamp - next_timestamp; |
| 223 | return playrtp_oss_write(zeros, samples_available); |
| 224 | } |
| 225 | |
| 226 | /** @brief OSS backend for playrtp */ |
| 227 | void playrtp_oss(void) { |
| 228 | int escape; |
| 229 | const struct packet *p; |
| 230 | |
| 231 | pthread_mutex_lock(&lock); |
| 232 | for(;;) { |
| 233 | /* Wait for the buffer to fill up a bit */ |
| 234 | playrtp_fill_buffer(); |
| 235 | playrtp_oss_enable(); |
| 236 | escape = 0; |
| 237 | info("Playing..."); |
| 238 | /* Keep playing until the buffer empties out, we get an error */ |
| 239 | while((nsamples >= minbuffer |
| 240 | || (nsamples > 0 |
| 241 | && contains(pheap_first(&packets), next_timestamp))) |
| 242 | && !escape) { |
| 243 | /* Wait until we can play more */ |
| 244 | pthread_mutex_unlock(&lock); |
| 245 | playrtp_oss_wait(); |
| 246 | pthread_mutex_lock(&lock); |
| 247 | /* Device is ready for more data, find something to play */ |
| 248 | p = playrtp_next_packet(); |
| 249 | /* Play it or play some silence */ |
| 250 | if(contains(p, next_timestamp)) |
| 251 | escape = playrtp_oss_play(p); |
| 252 | else |
| 253 | escape = playrtp_oss_infill(p); |
| 254 | } |
| 255 | active = 0; |
| 256 | /* We stop playing for a bit until the buffer re-fills */ |
| 257 | pthread_mutex_unlock(&lock); |
| 258 | playrtp_oss_disable(escape); |
| 259 | pthread_mutex_lock(&lock); |
| 260 | } |
| 261 | } |
| 262 | |
| 263 | #endif |
| 264 | |
| 265 | /* |
| 266 | Local Variables: |
| 267 | c-basic-offset:2 |
| 268 | comment-column:40 |
| 269 | fill-column:79 |
| 270 | indent-tabs-mode:nil |
| 271 | End: |
| 272 | */ |