libao2/ao_jack.c

   1 /*
   2  * JACK audio output driver for MPlayer
   3  *
   4  * Copyleft 2001 by Felix Bünemann (atmosfear@users.sf.net)
   5  * and Reimar Döffinger (Reimar.Doeffinger@stud.uni-karlsruhe.de)
   6  *
   7  * This file is part of MPlayer.
   8  *
   9  * MPlayer is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * MPlayer is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * along with MPlayer; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #include <unistd.h>
  28
  29 #include "config.h"
  30 #include "mp_msg.h"
  31 #include "help_mp.h"
  32
  33 #include "audio_out.h"
  34 #include "audio_out_internal.h"
  35 #include "libaf/af_format.h"
  36 #include "osdep/timer.h"
  37 #include "subopt-helper.h"
  38
  39 #include "libavutil/fifo.h"
  40
  41 #include <jack/jack.h>
  42
  43 static const ao_info_t info =
  44 {
  45   "JACK audio output",
  46   "jack",
  47   "Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>",
  48   "based on ao_sdl.c"
  49 };
  50
  51 LIBAO_EXTERN(jack)
  52
  53 //! maximum number of channels supported, avoids lots of mallocs
  54 #define MAX_CHANS 6
  55 static jack_port_t *ports[MAX_CHANS];
  56 static int num_ports; ///< Number of used ports == number of channels
  57 static jack_client_t *client;
  58 static float jack_latency;
  59 static int estimate;
  60 static volatile int paused = 0; ///< set if paused
  61 static volatile int underrun = 0; ///< signals if an underrun occured
  62
  63 static volatile float callback_interval = 0;
  64 static volatile float callback_time = 0;
  65
  66 //! size of one chunk, if this is too small MPlayer will start to "stutter"
  67 //! after a short time of playback
  68 #define CHUNK_SIZE (16 * 1024)
  69 //! number of "virtual" chunks the buffer consists of
  70 #define NUM_CHUNKS 8
  71 #define BUFFSIZE (NUM_CHUNKS * CHUNK_SIZE)
  72
  73 //! buffer for audio data
  74 static AVFifoBuffer *buffer;
  75
  76 /**
  77  * \brief insert len bytes into buffer
  78  * \param data data to insert
  79  * \param len length of data
  80  * \return number of bytes inserted into buffer
  81  *
  82  * If there is not enough room, the buffer is filled up
  83  */
  84 static int write_buffer(unsigned char* data, int len) {
  85   int free = av_fifo_space(buffer);
  86   if (len > free) len = free;
  87   return av_fifo_generic_write(buffer, data, len, NULL);
  88 }
  89
  90 static void silence(float **bufs, int cnt, int num_bufs);
  91
  92 struct deinterleave {
  93   float **bufs;
  94   int num_bufs;
  95   int cur_buf;
  96   int pos;
  97 };
  98
  99 static void deinterleave(void *info, void *src, int len) {
 100   struct deinterleave *di = info;
 101   float *s = src;
 102   int i;
 103   len /= sizeof(float);
 104   for (i = 0; i < len; i++) {
 105     di->bufs[di->cur_buf++][di->pos] = s[i];
 106     if (di->cur_buf >= di->num_bufs) {
 107       di->cur_buf = 0;
 108       di->pos++;
 109     }
 110   }
 111 }
 112
 113 /**
 114  * \brief read data from buffer and splitting it into channels
 115  * \param bufs num_bufs float buffers, each will contain the data of one channel
 116  * \param cnt number of samples to read per channel
 117  * \param num_bufs number of channels to split the data into
 118  * \return number of samples read per channel, equals cnt unless there was too
 119  *         little data in the buffer
 120  *
 121  * Assumes the data in the buffer is of type float, the number of bytes
 122  * read is res * num_bufs * sizeof(float), where res is the return value.
 123  * If there is not enough data in the buffer remaining parts will be filled
 124  * with silence.
 125  */
 126 static int read_buffer(float **bufs, int cnt, int num_bufs) {
 127   struct deinterleave di = {bufs, num_bufs, 0, 0};
 128   int buffered = av_fifo_size(buffer);
 129   if (cnt * sizeof(float) * num_bufs > buffered) {
 130     silence(bufs, cnt, num_bufs);
 131     cnt = buffered / sizeof(float) / num_bufs;
 132   }
 133   av_fifo_generic_read(buffer, &di, cnt * num_bufs * sizeof(float), deinterleave);
 134   return cnt;
 135 }
 136
 137 // end ring buffer stuff
 138
 139 static int control(int cmd, void *arg) {
 140   return CONTROL_UNKNOWN;
 141 }
 142
 143 /**
 144  * \brief fill the buffers with silence
 145  * \param bufs num_bufs float buffers, each will contain the data of one channel
 146  * \param cnt number of samples in each buffer
 147  * \param num_bufs number of buffers
 148  */
 149 static void silence(float **bufs, int cnt, int num_bufs) {
 150   int i;
 151   for (i = 0; i < num_bufs; i++)
 152     memset(bufs[i], 0, cnt * sizeof(float));
 153 }
 154
 155 /**
 156  * \brief JACK Callback function
 157  * \param nframes number of frames to fill into buffers
 158  * \param arg unused
 159  * \return currently always 0
 160  *
 161  * Write silence into buffers if paused or an underrun occured
 162  */
 163 static int outputaudio(jack_nframes_t nframes, void *arg) {
 164   float *bufs[MAX_CHANS];
 165   int i;
 166   for (i = 0; i < num_ports; i++)
 167     bufs[i] = jack_port_get_buffer(ports[i], nframes);
 168   if (paused || underrun)
 169     silence(bufs, nframes, num_ports);
 170   else
 171     if (read_buffer(bufs, nframes, num_ports) < nframes)
 172       underrun = 1;
 173   if (estimate) {
 174     float now = (float)GetTimer() / 1000000.0;
 175     float diff = callback_time + callback_interval - now;
 176     if ((diff > -0.002) && (diff < 0.002))
 177       callback_time += callback_interval;
 178     else
 179       callback_time = now;
 180     callback_interval = (float)nframes / (float)ao_data.samplerate;
 181   }
 182   return 0;
 183 }
 184
 185 /**
 186  * \brief print suboption usage help
 187  */
 188 static void print_help (void)
 189 {
 190   mp_msg (MSGT_AO, MSGL_FATAL,
 191            "\n-ao jack commandline help:\n"
 192            "Example: mplayer -ao jack:port=myout\n"
 193            "  connects MPlayer to the jack ports named myout\n"
 194            "\nOptions:\n"
 195            "  port=<port name>\n"
 196            "    Connects to the given ports instead of the default physical ones\n"
 197            "  name=<client name>\n"
 198            "    Client name to pass to JACK\n"
 199            "  estimate\n"
 200            "    Estimates the amount of data in buffers (experimental)\n"
 201            "  autostart\n"
 202            "    Automatically start JACK server if necessary\n"
 203          );
 204 }
 205
 206 static int init(int rate, int channels, int format, int flags) {
 207   const char **matching_ports = NULL;
 208   char *port_name = NULL;
 209   char *client_name = NULL;
 210   int autostart = 0;
 211   opt_t subopts[] = {
 212     {"port", OPT_ARG_MSTRZ, &port_name, NULL},
 213     {"name", OPT_ARG_MSTRZ, &client_name, NULL},
 214     {"estimate", OPT_ARG_BOOL, &estimate, NULL},
 215     {"autostart", OPT_ARG_BOOL, &autostart, NULL},
 216     {NULL}
 217   };
 218   jack_options_t open_options = JackUseExactName;
 219   int port_flags = JackPortIsInput;
 220   int i;
 221   estimate = 1;
 222   if (subopt_parse(ao_subdevice, subopts) != 0) {
 223     print_help();
 224     return 0;
 225   }
 226   if (channels > MAX_CHANS) {
 227     mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] Invalid number of channels: %i\n", channels);
 228     goto err_out;
 229   }
 230   if (!client_name) {
 231     client_name = malloc(40);
 232     sprintf(client_name, "MPlayer [%d]", getpid());
 233   }
 234   if (!autostart)
 235     open_options |= JackNoStartServer;
 236   client = jack_client_open(client_name, open_options, NULL);
 237   if (!client) {
 238     mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] cannot open server\n");
 239     goto err_out;
 240   }
 241   buffer = av_fifo_alloc(BUFFSIZE);
 242   jack_set_process_callback(client, outputaudio, 0);
 243
 244   // list matching ports
 245   if (!port_name)
 246     port_flags |= JackPortIsPhysical;
 247   matching_ports = jack_get_ports(client, port_name, NULL, port_flags);
 248   if (!matching_ports || !matching_ports[0]) {
 249     mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] no physical ports available\n");
 250     goto err_out;
 251   }
 252   i = 1;
 253   while (matching_ports[i]) i++;
 254   if (channels > i) channels = i;
 255   num_ports = channels;
 256
 257   // create out output ports
 258   for (i = 0; i < num_ports; i++) {
 259     char pname[30];
 260     snprintf(pname, 30, "out_%d", i);
 261     ports[i] = jack_port_register(client, pname, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
 262     if (!ports[i]) {
 263       mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] not enough ports available\n");
 264       goto err_out;
 265     }
 266   }
 267   if (jack_activate(client)) {
 268     mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] activate failed\n");
 269     goto err_out;
 270   }
 271   for (i = 0; i < num_ports; i++) {
 272     if (jack_connect(client, jack_port_name(ports[i]), matching_ports[i])) {
 273       mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] connecting failed\n");
 274       goto err_out;
 275     }
 276   }
 277   rate = jack_get_sample_rate(client);
 278   jack_latency = (float)(jack_port_get_total_latency(client, ports[0]) +
 279                          jack_get_buffer_size(client)) / (float)rate;
 280   callback_interval = 0;
 281
 282   ao_data.channels = channels;
 283   ao_data.samplerate = rate;
 284   ao_data.format = AF_FORMAT_FLOAT_NE;
 285   ao_data.bps = channels * rate * sizeof(float);
 286   ao_data.buffersize = CHUNK_SIZE * NUM_CHUNKS;
 287   ao_data.outburst = CHUNK_SIZE;
 288   free(matching_ports);
 289   free(port_name);
 290   free(client_name);
 291   return 1;
 292
 293 err_out:
 294   free(matching_ports);
 295   free(port_name);
 296   free(client_name);
 297   if (client)
 298     jack_client_close(client);
 299   av_fifo_free(buffer);
 300   buffer = NULL;
 301   return 0;
 302 }
 303
 304 // close audio device
 305 static void uninit(int immed) {
 306   if (!immed)
 307     usec_sleep(get_delay() * 1000 * 1000);
 308   // HACK, make sure jack doesn't loop-output dirty buffers
 309   reset();
 310   usec_sleep(100 * 1000);
 311   jack_client_close(client);
 312   av_fifo_free(buffer);
 313   buffer = NULL;
 314 }
 315
 316 /**
 317  * \brief stop playing and empty buffers (for seeking/pause)
 318  */
 319 static void reset(void) {
 320   paused = 1;
 321   av_fifo_reset(buffer);
 322   paused = 0;
 323 }
 324
 325 /**
 326  * \brief stop playing, keep buffers (for pause)
 327  */
 328 static void audio_pause(void) {
 329   paused = 1;
 330 }
 331
 332 /**
 333  * \brief resume playing, after audio_pause()
 334  */
 335 static void audio_resume(void) {
 336   paused = 0;
 337 }
 338
 339 static int get_space(void) {
 340   return av_fifo_space(buffer);
 341 }
 342
 343 /**
 344  * \brief write data into buffer and reset underrun flag
 345  */
 346 static int play(void *data, int len, int flags) {
 347   if (!(flags & AOPLAY_FINAL_CHUNK))
 348     len -= len % ao_data.outburst;
 349   underrun = 0;
 350   return write_buffer(data, len);
 351 }
 352
 353 static float get_delay(void) {
 354   int buffered = av_fifo_size(buffer); // could be less
 355   float in_jack = jack_latency;
 356   if (estimate && callback_interval > 0) {
 357     float elapsed = (float)GetTimer() / 1000000.0 - callback_time;
 358     in_jack += callback_interval - elapsed;
 359     if (in_jack < 0) in_jack = 0;
 360   }
 361   return (float)buffered / (float)ao_data.bps + in_jack;
 362 }
 363