OpenAL audio support, actual output is mono-only (no positioning yet).

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@17634 b3059339-0415-0410-9bf9-f77b7e298cf2

3 files changed, 199 insertions, 0 deletions

diff --git a/libao2/Makefile b/libao2/Makefile
index 1153f5a7f2..2987a7a3ee 100644
--- a/libao2/Makefile
+++ b/libao2/Makefile
@@ -17,6 +17,7 @@ CFLAGS  = $(OPTFLAGS) -I. -I.. \
           $(ESD_INC) \
           $(EXTRA_INC) \
           $(JACK_INC) \
+          $(OPENAL_INC) \
           $(POLYP_INC) \
           $(SDL_INC) \
           $(X11_INC) \
diff --git a/libao2/ao_openal.c b/libao2/ao_openal.c
new file mode 100644
index 0000000000..842a5a4049
--- /dev/null
+++ b/libao2/ao_openal.c
@@ -0,0 +1,196 @@
+/* 
+ * ao_openal.c - OpenAL audio output driver for MPlayer
+ *
+ * This driver is under the same license as MPlayer.
+ * (http://www.mplayerhq.hu)
+ *
+ * Copyleft 2006 by Reimar Döffinger (Reimar.Doeffinger@stud.uni-karlsruhe.de)
+ */
+
+#include <inttypes.h>
+#include <AL/alc.h>
+#include <AL/al.h>
+
+#include "config.h"
+#include "mp_msg.h"
+#include "help_mp.h"
+
+#include "audio_out.h"
+#include "audio_out_internal.h"
+#include "libaf/af_format.h"
+#include "osdep/timer.h"
+#include "subopt-helper.h"
+
+static ao_info_t info = 
+{
+  "OpenAL audio output",
+  "openal",
+  "Reimar Döffinger <Reimar.Doeffinger@stud.uni-karlsruhe.de>",
+  ""
+};
+
+LIBAO_EXTERN(openal)
+
+#define MAX_CHANS 6
+#define NUM_BUF 128
+#define CHUNK_SIZE 512
+static ALuint buffers[MAX_CHANS][NUM_BUF];
+static ALuint sources[MAX_CHANS];
+
+static int cur_buf[MAX_CHANS];
+static int unqueue_buf[MAX_CHANS];
+static int16_t *tmpbuf;
+
+
+static int control(int cmd, void *arg) {
+  return CONTROL_UNKNOWN;
+}
+
+/**
+ * \brief print suboption usage help
+ */
+static void print_help(void) {
+  mp_msg(MSGT_AO, MSGL_FATAL,
+          "\n-ao openal commandline help:\n"
+          "Example: mplayer -ao openal\n"
+          "\nOptions:\n"
+        );
+}
+
+static int init(int rate, int channels, int format, int flags) {
+  ALCdevice *dev = NULL;
+  ALCcontext *ctx = NULL;
+  ALint bufrate;
+  int i;
+  opt_t subopts[] = {
+    {NULL}
+  };
+  if (subopt_parse(ao_subdevice, subopts) != 0) {
+    print_help();
+    return 0;
+  }
+  if (channels > MAX_CHANS) {
+    mp_msg(MSGT_AO, MSGL_FATAL, "[OpenAL] Invalid number of channels: %i\n", channels);
+    goto err_out;
+  }
+  dev = alcOpenDevice(NULL);
+  if (!dev) {
+    mp_msg(MSGT_AO, MSGL_FATAL, "[OpenAL] could not open device\n");
+    goto err_out;
+  }
+  ctx = alcCreateContext(dev, NULL);
+  alcMakeContextCurrent(ctx);
+  for (i = 0; i < channels; i++) {
+    cur_buf[i] = 0;
+    unqueue_buf[i] = 0;
+    alGenBuffers(NUM_BUF, buffers[i]);
+  }
+  alGenSources(channels, sources);
+  alSource3f(sources[0], AL_POSITION, 0, 0, 10);
+  ao_data.channels = channels;
+  alGetBufferi(buffers[0][0], AL_FREQUENCY, &bufrate);
+  ao_data.samplerate = rate = bufrate;
+  ao_data.format = AF_FORMAT_S16_NE;
+  ao_data.bps = channels * rate * 2;
+  ao_data.buffersize = CHUNK_SIZE * NUM_BUF;
+  ao_data.outburst = channels * CHUNK_SIZE;
+  tmpbuf = (int16_t *)malloc(CHUNK_SIZE);
+  return 1;
+
+err_out:
+  return 0;
+}
+
+// close audio device
+static void uninit(int immed) {
+  ALCcontext *ctx = alcGetCurrentContext();
+  ALCdevice *dev = alcGetContextsDevice(ctx);
+  free(tmpbuf);
+  if (!immed) {
+    ALint state;
+    alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
+    while (state == AL_PLAYING) {
+      usec_sleep(10000);
+      alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
+    }
+  }
+  reset();
+  alcMakeContextCurrent(NULL);
+  alcDestroyContext(ctx);
+  alcCloseDevice(dev);
+}
+
+static void unqueue_buffers(void) {
+  ALint p;
+  int s, i;
+  for (s = 0;  s < ao_data.channels; s++) {
+    alGetSourcei(sources[s], AL_BUFFERS_PROCESSED, &p);
+    for (i = 0; i < p; i++) {
+      alSourceUnqueueBuffers(sources[s], 1, &buffers[s][unqueue_buf[s]]);
+      unqueue_buf[s] = (unqueue_buf[s] + 1) % NUM_BUF;
+    }
+  }
+}
+
+/**
+ * \brief stop playing and empty buffers (for seeking/pause)
+ */
+static void reset(void) {
+  alSourceRewindv(ao_data.channels, sources);
+  unqueue_buffers();
+}
+
+/**
+ * \brief stop playing, keep buffers (for pause)
+ */
+static void audio_pause(void) {
+  alSourcePausev(ao_data.channels, sources);
+}
+
+/**
+ * \brief resume playing, after audio_pause()
+ */
+static void audio_resume(void) {
+  alSourcePlayv(ao_data.channels, sources);
+}
+
+static int get_space(void) {
+  ALint queued;
+  unqueue_buffers();
+  alGetSourcei(sources[0], AL_BUFFERS_QUEUED, &queued);
+  return (NUM_BUF - queued) * CHUNK_SIZE * ao_data.channels;
+}
+
+/**
+ * \brief write data into buffer and reset underrun flag
+ */
+static int play(void *data, int len, int flags) {
+  ALint state;
+  int i, j, k;
+  int ch;
+  int16_t *d = data;
+  len /= ao_data.outburst;
+  for (i = 0; i < len; i++) {
+    for (ch = 0; ch < ao_data.channels; ch++) {
+      for (j = 0, k = ch; j < CHUNK_SIZE / 2; j++, k += ao_data.channels)
+        tmpbuf[j] = d[k];
+      alBufferData(buffers[ch][cur_buf[ch]], AL_FORMAT_MONO16, tmpbuf,
+                     CHUNK_SIZE, ao_data.samplerate);
+      alSourceQueueBuffers(sources[ch], 1, &buffers[ch][cur_buf[ch]]);
+      cur_buf[ch] = (cur_buf[ch] + 1) % NUM_BUF;
+    }
+    d += ao_data.channels * CHUNK_SIZE / 2;
+  }
+  alGetSourcei(sources[0], AL_SOURCE_STATE, &state);
+  if (state != AL_PLAYING) // checked here in case of an underrun
+    alSourcePlayv(ao_data.channels, sources);
+  return len * ao_data.outburst;
+}
+
+static float get_delay(void) {
+  ALint queued;
+  unqueue_buffers();
+  alGetSourcei(sources[0], AL_BUFFERS_QUEUED, &queued);
+  return queued * CHUNK_SIZE / 2 / (float)ao_data.samplerate;
+}
+
diff --git a/libao2/audio_out.c b/libao2/audio_out.c
index c5802006a7..f8c2682b84 100644
--- a/libao2/audio_out.c
+++ b/libao2/audio_out.c
@@ -31,6 +31,7 @@ extern ao_functions_t audio_out_polyp;
 #ifdef USE_JACK
 extern ao_functions_t audio_out_jack;
 #endif
+extern ao_functions_t audio_out_openal;
 extern ao_functions_t audio_out_null;
 #ifdef HAVE_ALSA5
  extern ao_functions_t audio_out_alsa5;
@@ -120,6 +121,7 @@ ao_functions_t* audio_out_drivers[] =
 #ifdef HAVE_SDL
         &audio_out_sdl,
 #endif
+        &audio_out_openal,
         &audio_out_null,
 // should not be auto-selected:
 	&audio_out_pcm,