v4l2 audio/video outputs for linux 2.6.22+ kernels (outputs formerly known as ivtv)

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@23925 b3059339-0415-0410-9bf9-f77b7e298cf2

2 files changed, 165 insertions, 0 deletions

diff --git a/libao2/ao_v4l2.c b/libao2/ao_v4l2.c
new file mode 100644
index 0000000000..6dca333c1d
--- /dev/null
+++ b/libao2/ao_v4l2.c
@@ -0,0 +1,159 @@
+/*
+ *  Copyright (C) 2007 Benjamin Zores
+ *   Audio output for V4L2 hardware MPEG decoders.
+ *
+ *   This program 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.
+ *
+ *   This program 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 with this program; if not, write to the Free Software Foundation,
+ *  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ *  WARNING: you need to force -ac hwmpa for audio output to work.
+ */
+
+#include <inttypes.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 "libmpdemux/mpeg_packetizer.h"
+
+#define MPEG_AUDIO_ID 0x1C0
+
+static int freq = 0;
+
+static ao_info_t info = 
+{
+  "V4L2 MPEG Audio Decoder output",
+  "v4l2",
+  "Benjamin Zores",
+  ""
+};
+
+LIBAO_EXTERN (v4l2)
+
+/* to set/get/query special features/parameters */
+static int
+control (int cmd,void *arg)
+{
+  return CONTROL_UNKNOWN;
+}
+
+/* open & setup audio device */
+static int
+init (int rate, int channels, int format, int flags)
+{
+  extern int v4l2_fd;
+
+  if (v4l2_fd < 0)
+    return 0;
+
+  if (format != AF_FORMAT_MPEG2)
+  {
+    mp_msg (MSGT_AO, MSGL_FATAL,
+            "AO: [v4l2] can only handle MPEG audio streams.\n");
+    return 0;
+  }
+  
+  ao_data.outburst = 2048;
+  ao_data.samplerate = rate;
+  ao_data.channels = channels;
+  ao_data.format = AF_FORMAT_MPEG2;
+  ao_data.buffersize = 2048;
+  ao_data.bps = rate * 2 * 2;
+  ao_data.pts = 0;
+  freq = rate;
+
+  /* check for supported audio rate */
+  if (rate != 32000 || rate != 41000 || rate != 48000)
+  {
+    mp_msg (MSGT_AO, MSGL_ERR, MSGTR_AO_MPEGPES_UnsupSamplerate, rate);
+    rate = 48000;
+  }
+
+  return 1;
+}
+
+/* close audio device */
+static void
+uninit (int immed)
+{
+  /* nothing to do */
+}
+
+/* stop playing and empty buffers (for seeking/pause) */
+static void
+reset (void)
+{
+  /* nothing to do */
+}
+
+/* stop playing, keep buffers (for pause) */
+static void
+audio_pause (void)
+{
+  reset ();
+}
+
+/* resume playing, after audio_pause() */
+static void
+audio_resume (void)
+{
+  /* nothing to do */
+}
+
+/* how many bytes can be played without blocking */
+static int
+get_space (void)
+{
+  extern int vo_pts;
+  float x;
+  int y;
+
+  x = (float) (vo_pts - ao_data.pts) / 90000.0;
+  if (x <= 0)
+    return 0;
+  
+  y  = freq * 4 * x;
+  y /= ao_data.outburst;
+  y *= ao_data.outburst;
+  
+  if (y > 32000)
+    y = 32000;
+
+  return y;
+}
+
+/* number of bytes played */
+static int
+play (void *data, int len, int flags)
+{
+  extern int v4l2_write (unsigned char *data, int len);
+  
+  if (ao_data.format != AF_FORMAT_MPEG2)
+    return 0;
+
+  send_mpeg_pes_packet (data, len, MPEG_AUDIO_ID, ao_data.pts, 2, v4l2_write);
+
+  return len;
+}
+
+/* delay in seconds between first and last sample in buffer */
+static float
+get_delay (void)
+{
+  return 0.0;
+}
diff --git a/libao2/audio_out.c b/libao2/audio_out.c
index 7546f43095..4cf00726ec 100644
--- a/libao2/audio_out.c
+++ b/libao2/audio_out.c
@@ -68,6 +68,9 @@ extern ao_functions_t audio_out_dxr2;
 #ifdef HAVE_IVTV
 extern ao_functions_t audio_out_ivtv;
 #endif
+#ifdef HAVE_V4L2_DECODER
+extern ao_functions_t audio_out_v4l2;
+#endif
 extern ao_functions_t audio_out_mpegpes;
 extern ao_functions_t audio_out_pcm;
 extern ao_functions_t audio_out_pss;
@@ -131,6 +134,9 @@ ao_functions_t* audio_out_drivers[] =
 #ifdef HAVE_IVTV
         &audio_out_ivtv,
 #endif
+#ifdef HAVE_V4L2_DECODER
+        &audio_out_v4l2,
+#endif
         &audio_out_null,
 // should not be auto-selected:
 	&audio_out_pcm,