--- /dev/null
+/*
+ Copyright (C) 2006 Mathieu Olivier
+
+ 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:
+
+ Free Software Foundation, Inc.
+ 59 Temple Place - Suite 330
+ Boston, MA 02111-1307, USA
+
+*/
+
+// ALSA module, used by Linux
+
+#include "quakedef.h"
+
+#include <alsa/asoundlib.h>
+
+#include "snd_main.h"
+
+
+#define NB_PERIODS 4
+
+static snd_pcm_t* pcm_handle = NULL;
+static snd_pcm_sframes_t expected_delay = 0;
+static unsigned int alsasoundtime;
+
+static snd_seq_t* seq_handle = NULL;
+
+/*
+====================
+SndSys_Init
+
+Create "snd_renderbuffer" with the proper sound format if the call is successful
+May return a suggested format if the requested format isn't available
+====================
+*/
+qboolean SndSys_Init (const snd_format_t* requested, snd_format_t* suggested)
+{
+ const char* pcm_name, *seq_name;
+ int i, err, seq_client, seq_port;
+ snd_pcm_hw_params_t* hw_params = NULL;
+ snd_pcm_format_t snd_pcm_format;
+ snd_pcm_uframes_t buffer_size;
+
+ Con_Print ("SndSys_Init: using the ALSA module\n");
+
+ seq_name = NULL;
+// COMMANDLINEOPTION: Linux ALSA Sound: -sndseqin <client>:<port> selects which sequencer port to use for input, by default no sequencer port is used (MIDI note events from that port get mapped to MIDINOTE<n> keys that can be bound)
+ i = COM_CheckParm ("-sndseqin"); // TODO turn this into a cvar, maybe
+ if (i != 0 && i < com_argc - 1)
+ seq_name = com_argv[i + 1];
+ if(seq_name)
+ {
+ seq_client = atoi(seq_name);
+ seq_port = 0;
+ if(strchr(seq_name, ':'))
+ seq_port = atoi(strchr(seq_name, ':') + 1);
+ Con_Printf ("SndSys_Init: seq input port has been set to \"%d:%d\". Enabling sequencer input...\n", seq_client, seq_port);
+ err = snd_seq_open (&seq_handle, "default", SND_SEQ_OPEN_INPUT, 0);
+ if (err < 0)
+ {
+ Con_Print ("SndSys_Init: can't open seq device\n");
+ goto seqdone;
+ }
+ err = snd_seq_set_client_name(seq_handle, gamename);
+ if (err < 0)
+ {
+ Con_Print ("SndSys_Init: can't set name of seq device\n");
+ goto seqerror;
+ }
+ err = snd_seq_create_simple_port(seq_handle, gamename, SND_SEQ_PORT_CAP_WRITE | SND_SEQ_PORT_CAP_SUBS_WRITE, SND_SEQ_PORT_TYPE_MIDI_GENERIC | SND_SEQ_PORT_TYPE_APPLICATION);
+ if(err < 0)
+ {
+ Con_Print ("SndSys_Init: can't create seq port\n");
+ goto seqerror;
+ }
+ err = snd_seq_connect_from(seq_handle, 0, seq_client, seq_port);
+ if(err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't connect to seq port \"%d:%d\"\n", seq_client, seq_port);
+ goto seqerror;
+ }
+ err = snd_seq_nonblock(seq_handle, 1);
+ if(err < 0)
+ {
+ Con_Print ("SndSys_Init: can't make seq nonblocking\n");
+ goto seqerror;
+ }
+
+ goto seqdone;
+
+seqerror:
+ snd_seq_close(seq_handle);
+ seq_handle = NULL;
+ }
+
+seqdone:
+ // Check the requested sound format
+ if (requested->width < 1 || requested->width > 2)
+ {
+ Con_Printf ("SndSys_Init: invalid sound width (%hu)\n",
+ requested->width);
+
+ if (suggested != NULL)
+ {
+ memcpy (suggested, requested, sizeof (*suggested));
+
+ if (requested->width < 1)
+ suggested->width = 1;
+ else
+ suggested->width = 2;
+
+ Con_Printf ("SndSys_Init: suggesting sound width = %hu\n",
+ suggested->width);
+ }
+
+ return false;
+ }
+
+ if (pcm_handle != NULL)
+ {
+ Con_Print ("SndSys_Init: WARNING: Init called before Shutdown!\n");
+ SndSys_Shutdown ();
+ }
+
+ // Determine the name of the PCM handle we'll use
+ switch (requested->channels)
+ {
+ case 4:
+ pcm_name = "surround40";
+ break;
+ case 6:
+ pcm_name = "surround51";
+ break;
+ case 8:
+ pcm_name = "surround71";
+ break;
+ default:
+ pcm_name = "default";
+ break;
+ }
+// COMMANDLINEOPTION: Linux ALSA Sound: -sndpcm <devicename> selects which pcm device to use, default is "default"
+ i = COM_CheckParm ("-sndpcm");
+ if (i != 0 && i < com_argc - 1)
+ pcm_name = com_argv[i + 1];
+
+ // Open the audio device
+ Con_Printf ("SndSys_Init: PCM device is \"%s\"\n", pcm_name);
+ err = snd_pcm_open (&pcm_handle, pcm_name, SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't open audio device \"%s\" (%s)\n",
+ pcm_name, snd_strerror (err));
+ return false;
+ }
+
+ // Allocate the hardware parameters
+ err = snd_pcm_hw_params_malloc (&hw_params);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't allocate hardware parameters (%s)\n",
+ snd_strerror (err));
+ goto init_error;
+ }
+ err = snd_pcm_hw_params_any (pcm_handle, hw_params);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't initialize hardware parameters (%s)\n",
+ snd_strerror (err));
+ goto init_error;
+ }
+
+ // Set the access type
+ err = snd_pcm_hw_params_set_access (pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set access type (%s)\n",
+ snd_strerror (err));
+ goto init_error;
+ }
+
+ // Set the sound width
+ if (requested->width == 1)
+ snd_pcm_format = SND_PCM_FORMAT_U8;
+ else
+ snd_pcm_format = SND_PCM_FORMAT_S16;
+ err = snd_pcm_hw_params_set_format (pcm_handle, hw_params, snd_pcm_format);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set sound width to %hu (%s)\n",
+ requested->width, snd_strerror (err));
+ goto init_error;
+ }
+
+ // Set the sound channels
+ err = snd_pcm_hw_params_set_channels (pcm_handle, hw_params, requested->channels);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set sound channels to %hu (%s)\n",
+ requested->channels, snd_strerror (err));
+ goto init_error;
+ }
+
+ // Set the sound speed
+ err = snd_pcm_hw_params_set_rate (pcm_handle, hw_params, requested->speed, 0);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set sound speed to %u (%s)\n",
+ requested->speed, snd_strerror (err));
+ goto init_error;
+ }
+
+ // pick a buffer size that is a power of 2 (by masking off low bits)
+ buffer_size = i = (int)(requested->speed * 0.15f);
+ while (buffer_size & (buffer_size-1))
+ buffer_size &= (buffer_size-1);
+ // then check if it is the nearest power of 2 and bump it up if not
+ if (i - buffer_size >= buffer_size >> 1)
+ buffer_size *= 2;
+
+ err = snd_pcm_hw_params_set_buffer_size_near (pcm_handle, hw_params, &buffer_size);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set sound buffer size to %lu (%s)\n",
+ buffer_size, snd_strerror (err));
+ goto init_error;
+ }
+
+ // pick a period size near the buffer_size we got from ALSA
+ snd_pcm_hw_params_get_buffer_size (hw_params, &buffer_size);
+ buffer_size /= NB_PERIODS;
+ err = snd_pcm_hw_params_set_period_size_near(pcm_handle, hw_params, &buffer_size, 0);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set sound period size to %lu (%s)\n",
+ buffer_size, snd_strerror (err));
+ goto init_error;
+ }
+
+ err = snd_pcm_hw_params (pcm_handle, hw_params);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Init: can't set hardware parameters (%s)\n",
+ snd_strerror (err));
+ goto init_error;
+ }
+
+ snd_pcm_hw_params_free (hw_params);
+
+ snd_renderbuffer = Snd_CreateRingBuffer(requested, 0, NULL);
+ expected_delay = 0;
+ alsasoundtime = 0;
+ if (snd_channellayout.integer == SND_CHANNELLAYOUT_AUTO)
+ Cvar_SetValueQuick (&snd_channellayout, SND_CHANNELLAYOUT_ALSA);
+
+ return true;
+
+
+// It's not very clean, but it avoids a lot of duplicated code.
+init_error:
+
+ if (hw_params != NULL)
+ snd_pcm_hw_params_free (hw_params);
+
+ snd_pcm_close(pcm_handle);
+ pcm_handle = NULL;
+
+ return false;
+}
+
+
+/*
+====================
+SndSys_Shutdown
+
+Stop the sound card, delete "snd_renderbuffer" and free its other resources
+====================
+*/
+void SndSys_Shutdown (void)
+{
+ if (seq_handle != NULL)
+ {
+ snd_seq_close(seq_handle);
+ seq_handle = NULL;
+ }
+
+ if (pcm_handle != NULL)
+ {
+ snd_pcm_close(pcm_handle);
+ pcm_handle = NULL;
+ }
+
+ if (snd_renderbuffer != NULL)
+ {
+ Mem_Free(snd_renderbuffer->ring);
+ Mem_Free(snd_renderbuffer);
+ snd_renderbuffer = NULL;
+ }
+}
+
+
+/*
+====================
+SndSys_Recover
+
+Try to recover from errors
+====================
+*/
+static qboolean SndSys_Recover (int err_num)
+{
+ int err;
+
+ // We can only do something on underrun ("broken pipe") errors
+ if (err_num != -EPIPE)
+ return false;
+
+ err = snd_pcm_prepare (pcm_handle);
+ if (err < 0)
+ {
+ Con_Printf ("SndSys_Recover: unable to recover (%s)\n",
+ snd_strerror (err));
+
+ // TOCHECK: should we stop the playback ?
+
+ return false;
+ }
+
+ return true;
+}
+
+
+/*
+====================
+SndSys_Write
+====================
+*/
+static snd_pcm_sframes_t SndSys_Write (const unsigned char* buffer, unsigned int nbframes)
+{
+ snd_pcm_sframes_t written;
+
+ written = snd_pcm_writei (pcm_handle, buffer, nbframes);
+ if (written < 0)
+ {
+ if (developer_insane.integer && vid_activewindow)
+ Con_DPrintf ("SndSys_Write: audio write returned %ld (%s)!\n",
+ written, snd_strerror (written));
+
+ if (SndSys_Recover (written))
+ {
+ written = snd_pcm_writei (pcm_handle, buffer, nbframes);
+ if (written < 0)
+ Con_DPrintf ("SndSys_Write: audio write failed again (error %ld: %s)!\n",
+ written, snd_strerror (written));
+ }
+ }
+ if (written > 0)
+ {
+ snd_renderbuffer->startframe += written;
+ expected_delay += written;
+ }
+
+ return written;
+}
+
+
+/*
+====================
+SndSys_Submit
+
+Submit the contents of "snd_renderbuffer" to the sound card
+====================
+*/
+void SndSys_Submit (void)
+{
+ unsigned int startoffset, factor;
+ snd_pcm_uframes_t limit, nbframes;
+ snd_pcm_sframes_t written;
+
+ if (pcm_handle == NULL ||
+ snd_renderbuffer->startframe == snd_renderbuffer->endframe)
+ return;
+
+ startoffset = snd_renderbuffer->startframe % snd_renderbuffer->maxframes;
+ factor = snd_renderbuffer->format.width * snd_renderbuffer->format.channels;
+ limit = snd_renderbuffer->maxframes - startoffset;
+ nbframes = snd_renderbuffer->endframe - snd_renderbuffer->startframe;
+
+ if (nbframes > limit)
+ {
+ written = SndSys_Write (&snd_renderbuffer->ring[startoffset * factor], limit);
+ if (written < 0 || (snd_pcm_uframes_t)written != limit)
+ return;
+
+ nbframes -= limit;
+ startoffset = 0;
+ }
+
+ written = SndSys_Write (&snd_renderbuffer->ring[startoffset * factor], nbframes);
+ if (written < 0)
+ return;
+}
+
+
+/*
+====================
+SndSys_GetSoundTime
+
+Returns the number of sample frames consumed since the sound started
+====================
+*/
+unsigned int SndSys_GetSoundTime (void)
+{
+ snd_pcm_sframes_t delay, timediff;
+ int err;
+
+ if (pcm_handle == NULL)
+ return 0;
+
+ err = snd_pcm_delay (pcm_handle, &delay);
+ if (err < 0)
+ {
+ if (developer_insane.integer && vid_activewindow)
+ Con_DPrintf ("SndSys_GetSoundTime: can't get playback delay (%s)\n",
+ snd_strerror (err));
+
+ if (! SndSys_Recover (err))
+ return 0;
+
+ err = snd_pcm_delay (pcm_handle, &delay);
+ if (err < 0)
+ {
+ Con_DPrintf ("SndSys_GetSoundTime: can't get playback delay, again (%s)\n",
+ snd_strerror (err));
+ return 0;
+ }
+ }
+
+ if (expected_delay < delay)
+ {
+ Con_DPrintf ("SndSys_GetSoundTime: expected_delay(%ld) < delay(%ld)\n",
+ expected_delay, delay);
+ timediff = 0;
+ }
+ else
+ timediff = expected_delay - delay;
+ expected_delay = delay;
+
+ alsasoundtime += (unsigned int)timediff;
+
+ return alsasoundtime;
+}
+
+
+/*
+====================
+SndSys_LockRenderBuffer
+
+Get the exclusive lock on "snd_renderbuffer"
+====================
+*/
+qboolean SndSys_LockRenderBuffer (void)
+{
+ // Nothing to do
+ return true;
+}
+
+
+/*
+====================
+SndSys_UnlockRenderBuffer
+
+Release the exclusive lock on "snd_renderbuffer"
+====================
+*/
+void SndSys_UnlockRenderBuffer (void)
+{
+ // Nothing to do
+}
+
+/*
+====================
+SndSys_SendKeyEvents
+
+Send keyboard events originating from the sound system (e.g. MIDI)
+====================
+*/
+void SndSys_SendKeyEvents(void)
+{
+ snd_seq_event_t *event;
+ if(!seq_handle)
+ return;
+ for(;;)
+ {
+ if(snd_seq_event_input(seq_handle, &event) <= 0)
+ break;
+ if(event)
+ {
+ switch(event->type)
+ {
+ case SND_SEQ_EVENT_NOTEON:
+ if(event->data.note.velocity)
+ {
+ Key_Event(K_MIDINOTE0 + event->data.note.note, 0, true);
+ break;
+ }
+ case SND_SEQ_EVENT_NOTEOFF:
+ Key_Event(K_MIDINOTE0 + event->data.note.note, 0, false);
+ break;
+ }
+ }
+ }
+}
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