--- /dev/null
+/*****************************************************************************
+ * sndio.c : sndio plugin for VLC
+ *****************************************************************************
+ * Copyright (C) 2012 Rémi Denis-Courmont
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser 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.
+ *****************************************************************************/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <assert.h>
+
+#include <vlc_common.h>
+#include <vlc_plugin.h>
+#include <vlc_aout.h>
+
+#include <sndio.h>
+
+static int Open (vlc_object_t *);
+static void Close (vlc_object_t *);
+
+vlc_module_begin ()
+ set_shortname ("sndio")
+ set_description (N_("OpenBSD sndio audio output"))
+ set_category (CAT_AUDIO)
+ set_subcategory (SUBCAT_AUDIO_AOUT)
+ set_capability ("audio output", 120)
+ set_callbacks (Open, Close )
+vlc_module_end ()
+
+static void Play (audio_output_t *, block_t *);
+static void Pause (audio_output_t *, bool, mtime_t);
+
+/** Initializes an sndio playback stream */
+static int Open (vlc_object_t *obj)
+{
+ audio_output_t *aout = (audio_output_t *)obj;
+
+ struct sio_hdl *sio = sio_open (NULL, SIO_PLAY, 0 /* blocking */);
+ if (sio == NULL)
+ {
+ msg_Err (obj, "cannot create audio playback stream");
+ return VLC_EGENERIC;
+ }
+
+ struct sio_par par;
+ sio_initpar (&par);
+ par.bits = 16;
+ par.bps = par.bits >> 3;
+ par.sig = 1;
+ par.le = SIO_LE_NATIVE;
+ par.pchan = aout_FormatNbChannels (&aout->format);
+ par.rate = aout->format.i_rate;
+ par.xrun = SIO_SYNC;
+
+ if (!sio_setpar (sio, &par) || !sio_getpar (sio, &par))
+ {
+ msg_Err (obj, "cannot negotiate audio playback parameters");
+ goto error;
+ }
+
+ if (par.bps != par.bits >> 3)
+ {
+ msg_Err (obj, "unsupported audio sample format (%u bits in %u bytes)",
+ par.bits, par.bps);
+ goto error;
+ }
+
+ audio_format_t f;
+
+ switch (par.bps)
+ {
+ case 8:
+ f.i_format = par.sig ? VLC_CODEC_S8 : VLC_CODEC_U8;
+ break;
+ case 16:
+ f.i_format = par.sig ? (par.le ? VLC_CODEC_S16L : VLC_CODEC_S16B)
+ : (par.le ? VLC_CODEC_U16L : VLC_CODEC_U16B);
+ break;
+ case 24:
+ f.i_format = par.sig ? (par.le ? VLC_CODEC_S24L : VLC_CODEC_S24B)
+ : (par.le ? VLC_CODEC_U24L : VLC_CODEC_U24B);
+ break;
+ case 32:
+ f.i_format = par.sig ? (par.le ? VLC_CODEC_S32L : VLC_CODEC_S32B)
+ : (par.le ? VLC_CODEC_U32L : VLC_CODEC_U32B);
+ break;
+ default:
+ msg_Err (obj, "unsupported audio sample format (%u bits)",
+ par.bits);
+ goto error;
+ }
+
+ f.i_rate = par.rate;
+
+ /* Channel map */
+ unsigned chans;
+ switch (par.pchan)
+ {
+ case 1:
+ chans = AOUT_CHAN_CENTER;
+ break;
+ case 2:
+ chans = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT;
+ break;
+ case 4:
+ chans = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT;
+ break;
+ case 6:
+ chans = AOUT_CHAN_LEFT | AOUT_CHAN_RIGHT
+ | AOUT_CHAN_REARLEFT | AOUT_CHAN_REARRIGHT
+ | AOUT_CHAN_CENTER | AOUT_CHAN_LFE;
+ break;
+ default:
+ msg_Err (aout, "unknown %u channels map", par.pchan);
+ goto error;
+ }
+
+ f.i_original_channels = f.i_physical_channels = chans;
+ aout_FormatPrepare (&f);
+
+ aout->format = f;
+ aout->sys = (void *)sio;
+ aout->pf_play = Play;
+ aout->pf_pause = Pause;
+ aout->pf_flush = NULL; /* sndio sucks! */
+ aout_VolumeSoftInit (aout); /* TODO: sio_onvol() */
+
+ sio_start (sio);
+ return VLC_SUCCESS;
+
+error:
+ sio_close (sio);
+ return VLC_EGENERIC;
+}
+
+static void Close (vlc_object_t *obj)
+{
+ audio_output_t *aout = (audio_output_t *)obj;
+ struct sio_hdl *sio = (void *)aout->sys;
+
+ sio_close (sio);
+}
+
+static void Play (audio_output_t *aout, block_t *block)
+{
+ struct sio_hdl *sio = (void *)aout->sys;
+ struct sio_par par;
+
+ if (sio_getpar (sio, &par) == 0)
+ {
+ mtime_t delay = par.bufsz * CLOCK_FREQ / aout->format.i_rate;
+
+ delay = block->i_pts - (mdate () - delay);
+ if (delay > 0)
+ {
+ size_t frames = (delay * aout->format.i_rate) / CLOCK_FREQ;
+ msg_Dbg (aout, "prepending %zu zeroes", frames);
+
+ void *pad = calloc (frames, aout->format.i_bytes_per_frame);
+ if (likely(pad != NULL))
+ {
+ sio_write (sio, pad, frames * aout->format.i_bytes_per_frame);
+ free (pad);
+ }
+ }
+ else
+ aout_TimeReport (aout, block->i_pts - delay);
+ }
+
+ while (block->i_buffer > 0 && !sio_eof (sio))
+ {
+ size_t bytes = sio_write (sio, block->p_buffer, block->i_buffer);
+
+ block->p_buffer += bytes;
+ block->i_buffer -= bytes;
+ /* Note that i_nb_samples and i_pts are corrupted here. */
+ }
+ block_Release (block);
+}
+
+static void Pause (audio_output_t *aout, bool pause, mtime_t date)
+{
+ struct sio_hdl *sio = (void *)aout->sys;
+
+ if (pause)
+ sio_stop (sio);
+ else
+ sio_start (sio);
+ (void) date;
+}
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