1 files changed, 361 insertions, 0 deletions
diff --git a/audio/out/ao_jack.c b/audio/out/ao_jack.c
new file mode 100644
index 0000000000..b30f99a14e
--- /dev/null
+++ b/audio/out/ao_jack.c
@@ -0,0 +1,361 @@
+/*
+ * JACK audio output driver for MPlayer
+ *
+ * Copyleft 2001 by Felix Bünemann (atmosfear@users.sf.net)
+ * and Reimar Döffinger (Reimar.Doeffinger@stud.uni-karlsruhe.de)
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * along with MPlayer; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "mp_msg.h"
+
+#include "audio_out.h"
+#include "audio_out_internal.h"
+#include "libaf/format.h"
+#include "osdep/timer.h"
+#include "subopt-helper.h"
+
+#include "libavutil/fifo.h"
+
+#include <jack/jack.h>
+
+static const ao_info_t info =
+{
+  "JACK audio output",
+  "jack",
+  "Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>",
+  "based on ao_sdl.c"
+};
+
+LIBAO_EXTERN(jack)
+
+//! maximum number of channels supported, avoids lots of mallocs
+#define MAX_CHANS 8
+static jack_port_t *ports[MAX_CHANS];
+static int num_ports; ///< Number of used ports == number of channels
+static jack_client_t *client;
+static float jack_latency;
+static int estimate;
+static volatile int paused = 0; ///< set if paused
+static volatile int underrun = 0; ///< signals if an underrun occured
+
+static volatile float callback_interval = 0;
+static volatile float callback_time = 0;
+
+//! size of one chunk, if this is too small MPlayer will start to "stutter"
+//! after a short time of playback
+#define CHUNK_SIZE (16 * 1024)
+//! number of "virtual" chunks the buffer consists of
+#define NUM_CHUNKS 8
+#define BUFFSIZE (NUM_CHUNKS * CHUNK_SIZE)
+
+//! buffer for audio data
+static AVFifoBuffer *buffer;
+
+/**
+ * \brief insert len bytes into buffer
+ * \param data data to insert
+ * \param len length of data
+ * \return number of bytes inserted into buffer
+ *
+ * If there is not enough room, the buffer is filled up
+ */
+static int write_buffer(unsigned char* data, int len) {
+  int free = av_fifo_space(buffer);
+  if (len > free) len = free;
+  return av_fifo_generic_write(buffer, data, len, NULL);
+}
+
+static void silence(float **bufs, int cnt, int num_bufs);
+
+struct deinterleave {
+  float **bufs;
+  int num_bufs;
+  int cur_buf;
+  int pos;
+};
+
+static void deinterleave(void *info, void *src, int len) {
+  struct deinterleave *di = info;
+  float *s = src;
+  int i;
+  len /= sizeof(float);
+  for (i = 0; i < len; i++) {
+    di->bufs[di->cur_buf++][di->pos] = s[i];
+    if (di->cur_buf >= di->num_bufs) {
+      di->cur_buf = 0;
+      di->pos++;
+    }
+  }
+}
+
+/**
+ * \brief read data from buffer and splitting it into channels
+ * \param bufs num_bufs float buffers, each will contain the data of one channel
+ * \param cnt number of samples to read per channel
+ * \param num_bufs number of channels to split the data into
+ * \return number of samples read per channel, equals cnt unless there was too
+ *         little data in the buffer
+ *
+ * Assumes the data in the buffer is of type float, the number of bytes
+ * read is res * num_bufs * sizeof(float), where res is the return value.
+ * If there is not enough data in the buffer remaining parts will be filled
+ * with silence.
+ */
+static int read_buffer(float **bufs, int cnt, int num_bufs) {
+  struct deinterleave di = {bufs, num_bufs, 0, 0};
+  int buffered = av_fifo_size(buffer);
+  if (cnt * sizeof(float) * num_bufs > buffered) {
+    silence(bufs, cnt, num_bufs);
+    cnt = buffered / sizeof(float) / num_bufs;
+  }
+  av_fifo_generic_read(buffer, &di, cnt * num_bufs * sizeof(float), deinterleave);
+  return cnt;
+}
+
+// end ring buffer stuff
+
+static int control(int cmd, void *arg) {
+  return CONTROL_UNKNOWN;
+}
+
+/**
+ * \brief fill the buffers with silence
+ * \param bufs num_bufs float buffers, each will contain the data of one channel
+ * \param cnt number of samples in each buffer
+ * \param num_bufs number of buffers
+ */
+static void silence(float **bufs, int cnt, int num_bufs) {
+  int i;
+  for (i = 0; i < num_bufs; i++)
+    memset(bufs[i], 0, cnt * sizeof(float));
+}
+
+/**
+ * \brief JACK Callback function
+ * \param nframes number of frames to fill into buffers
+ * \param arg unused
+ * \return currently always 0
+ *
+ * Write silence into buffers if paused or an underrun occured
+ */
+static int outputaudio(jack_nframes_t nframes, void *arg) {
+  float *bufs[MAX_CHANS];
+  int i;
+  for (i = 0; i < num_ports; i++)
+    bufs[i] = jack_port_get_buffer(ports[i], nframes);
+  if (paused || underrun)
+    silence(bufs, nframes, num_ports);
+  else
+    if (read_buffer(bufs, nframes, num_ports) < nframes)
+      underrun = 1;
+  if (estimate) {
+    float now = (float)GetTimer() / 1000000.0;
+    float diff = callback_time + callback_interval - now;
+    if ((diff > -0.002) && (diff < 0.002))
+      callback_time += callback_interval;
+    else
+      callback_time = now;
+    callback_interval = (float)nframes / (float)ao_data.samplerate;
+  }
+  return 0;
+}
+
+/**
+ * \brief print suboption usage help
+ */
+static void print_help (void)
+{
+  mp_msg (MSGT_AO, MSGL_FATAL,
+           "\n-ao jack commandline help:\n"
+           "Example: mpv -ao jack:port=myout\n"
+           "  connects mpv to the jack ports named myout\n"
+           "\nOptions:\n"
+           "  port=<port name>\n"
+           "    Connects to the given ports instead of the default physical ones\n"
+           "  name=<client name>\n"
+           "    Client name to pass to JACK\n"
+           "  estimate\n"
+           "    Estimates the amount of data in buffers (experimental)\n"
+           "  autostart\n"
+           "    Automatically start JACK server if necessary\n"
+         );
+}
+
+static int init(int rate, int channels, int format, int flags) {
+  const char **matching_ports = NULL;
+  char *port_name = NULL;
+  char *client_name = NULL;
+  int autostart = 0;
+  const opt_t subopts[] = {
+    {"port", OPT_ARG_MSTRZ, &port_name, NULL},
+    {"name", OPT_ARG_MSTRZ, &client_name, NULL},
+    {"estimate", OPT_ARG_BOOL, &estimate, NULL},
+    {"autostart", OPT_ARG_BOOL, &autostart, NULL},
+    {NULL}
+  };
+  jack_options_t open_options = JackUseExactName;
+  int port_flags = JackPortIsInput;
+  int i;
+  estimate = 1;
+  if (subopt_parse(ao_subdevice, subopts) != 0) {
+    print_help();
+    return 0;
+  }
+  if (channels > MAX_CHANS) {
+    mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] Invalid number of channels: %i\n", channels);
+    goto err_out;
+  }
+  if (!client_name) {
+    client_name = malloc(40);
+    sprintf(client_name, "mpv [%d]", getpid());
+  }
+  if (!autostart)
+    open_options |= JackNoStartServer;
+  client = jack_client_open(client_name, open_options, NULL);
+  if (!client) {
+    mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] cannot open server\n");
+    goto err_out;
+  }
+  buffer = av_fifo_alloc(BUFFSIZE);
+  jack_set_process_callback(client, outputaudio, 0);
+
+  // list matching ports
+  if (!port_name)
+    port_flags |= JackPortIsPhysical;
+  matching_ports = jack_get_ports(client, port_name, NULL, port_flags);
+  if (!matching_ports || !matching_ports[0]) {
+    mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] no physical ports available\n");
+    goto err_out;
+  }
+  i = 1;
+  while (matching_ports[i]) i++;
+  if (channels > i) channels = i;
+  num_ports = channels;
+
+  // create out output ports
+  for (i = 0; i < num_ports; i++) {
+    char pname[30];
+    snprintf(pname, 30, "out_%d", i);
+    ports[i] = jack_port_register(client, pname, JACK_DEFAULT_AUDIO_TYPE, JackPortIsOutput, 0);
+    if (!ports[i]) {
+      mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] not enough ports available\n");
+      goto err_out;
+    }
+  }
+  if (jack_activate(client)) {
+    mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] activate failed\n");
+    goto err_out;
+  }
+  for (i = 0; i < num_ports; i++) {
+    if (jack_connect(client, jack_port_name(ports[i]), matching_ports[i])) {
+      mp_msg(MSGT_AO, MSGL_FATAL, "[JACK] connecting failed\n");
+      goto err_out;
+    }
+  }
+  rate = jack_get_sample_rate(client);
+  jack_latency = (float)(jack_port_get_total_latency(client, ports[0]) +
+                         jack_get_buffer_size(client)) / (float)rate;
+  callback_interval = 0;
+
+  ao_data.channels = channels;
+  ao_data.samplerate = rate;
+  ao_data.format = AF_FORMAT_FLOAT_NE;
+  ao_data.bps = channels * rate * sizeof(float);
+  ao_data.buffersize = CHUNK_SIZE * NUM_CHUNKS;
+  ao_data.outburst = CHUNK_SIZE;
+  free(matching_ports);
+  free(port_name);
+  free(client_name);
+  return 1;
+
+err_out:
+  free(matching_ports);
+  free(port_name);
+  free(client_name);
+  if (client)
+    jack_client_close(client);
+  av_fifo_free(buffer);
+  buffer = NULL;
+  return 0;
+}
+
+// close audio device
+static void uninit(int immed) {
+  if (!immed)
+    usec_sleep(get_delay() * 1000 * 1000);
+  // HACK, make sure jack doesn't loop-output dirty buffers
+  reset();
+  usec_sleep(100 * 1000);
+  jack_client_close(client);
+  av_fifo_free(buffer);
+  buffer = NULL;
+}
+
+/**
+ * \brief stop playing and empty buffers (for seeking/pause)
+ */
+static void reset(void) {
+  paused = 1;
+  av_fifo_reset(buffer);
+  paused = 0;
+}
+
+/**
+ * \brief stop playing, keep buffers (for pause)
+ */
+static void audio_pause(void) {
+  paused = 1;
+}
+
+/**
+ * \brief resume playing, after audio_pause()
+ */
+static void audio_resume(void) {
+  paused = 0;
+}
+
+static int get_space(void) {
+  return av_fifo_space(buffer);
+}
+
+/**
+ * \brief write data into buffer and reset underrun flag
+ */
+static int play(void *data, int len, int flags) {
+  if (!(flags & AOPLAY_FINAL_CHUNK))
+    len -= len % ao_data.outburst;
+  underrun = 0;
+  return write_buffer(data, len);
+}
+
+static float get_delay(void) {
+  int buffered = av_fifo_size(buffer); // could be less
+  float in_jack = jack_latency;
+  if (estimate && callback_interval > 0) {
+    float elapsed = (float)GetTimer() / 1000000.0 - callback_time;
+    in_jack += callback_interval - elapsed;
+    if (in_jack < 0) in_jack = 0;
+  }
+  return (float)buffered / (float)ao_data.bps + in_jack;
+}