From fef7334bddb9fccfbd6deab7d5d466ab3e76323a Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Sat, 11 Jul 2009 00:56:13 -0700
Subject: [PATCH] Hook aoview directly to alsa

This skips the flite internal audio stuff which opened and closed the audio
device for each phrase. This caused the first part of some phrases to be
missed when using an external audio device.

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 aoview/Makefile.am    |  4 ++--
 aoview/aoview_flite.c | 49 +++++++++++++++++++++++++++++++++++++++++--
 aoview/aoview_voice.c |  2 ++
 configure.ac          |  2 ++
 4 files changed, 53 insertions(+), 4 deletions(-)

diff --git a/aoview/Makefile.am b/aoview/Makefile.am
index c354aa0f..00851b67 100644
--- a/aoview/Makefile.am
+++ b/aoview/Makefile.am
@@ -1,9 +1,9 @@
 VERSION=$(shell git describe)
-AM_CFLAGS=$(GNOME_CFLAGS) -I$(top_srcdir)/src -DAOVIEW_VERSION=\"$(VERSION)\" @FLITE_INCS@
+AM_CFLAGS=$(GNOME_CFLAGS) $(ALSA_CFLAGS) -I$(top_srcdir)/src -DAOVIEW_VERSION=\"$(VERSION)\" @FLITE_INCS@
 
 bin_PROGRAMS=aoview
 
-aoview_LDADD=$(GNOME_LIBS) $(FLITE_LIBS)
+aoview_LDADD=$(GNOME_LIBS) $(FLITE_LIBS) $(ALSA_LIBS)
 
 aoview_SOURCES = \
 	aoview_main.c \
diff --git a/aoview/aoview_flite.c b/aoview/aoview_flite.c
index bca19043..2673824d 100644
--- a/aoview/aoview_flite.c
+++ b/aoview/aoview_flite.c
@@ -18,6 +18,7 @@
 #include <stdio.h>
 #include <flite/flite.h>
 #include "aoview.h"
+#include <alsa/asoundlib.h>
 
 cst_voice *register_cmu_us_kal();
 static cst_voice *voice;
@@ -25,14 +26,58 @@ static cst_voice *voice;
 static FILE *pipe_write;
 static GThread *aoview_flite_thread;
 
+static snd_pcm_t	*alsa_handle;
+
 gpointer
 aoview_flite_task(gpointer data)
 {
 	FILE		*input = data;
 	char		line[1024];
+	cst_wave	*wave;
+	int		rate;
+	int		channels;
+	int		err;
 
-	while (fgets(line, sizeof (line) - 1, input) != NULL)
-		flite_text_to_speech(line, voice, "play");
+	err = snd_pcm_open(&alsa_handle, "default",
+			   SND_PCM_STREAM_PLAYBACK, 0);
+	if (err >= 0)
+	{
+		if (err < 0) {
+			snd_pcm_close(alsa_handle);
+			alsa_handle = 0;
+		}
+	}
+	rate = 0;
+	channels = 0;
+	while (fgets(line, sizeof (line) - 1, input) != NULL) {
+		if (!alsa_handle)
+			continue;
+		wave = flite_text_to_wave(line, voice);
+		if (wave->sample_rate != rate ||
+		    wave->num_channels != channels)
+		{
+			rate = wave->sample_rate;
+			channels = wave->num_channels;
+			snd_pcm_set_params(alsa_handle,
+					   SND_PCM_FORMAT_S16,
+					   SND_PCM_ACCESS_RW_INTERLEAVED,
+					   channels,
+					   rate,
+					   1,
+					   100000);
+		}
+		snd_pcm_prepare(alsa_handle);
+		err = snd_pcm_writei(alsa_handle,
+				     wave->samples,
+				     wave->num_samples);
+		if (err < 0)
+			fprintf(stderr, "alsa write error %s\n",
+				strerror(-err));
+		snd_pcm_drain(alsa_handle);
+		delete_wave(wave);
+	}
+	snd_pcm_close(alsa_handle);
+	alsa_handle = 0;
 	return NULL;
 }
 
diff --git a/aoview/aoview_voice.c b/aoview/aoview_voice.c
index f7c099b1..24422df6 100644
--- a/aoview/aoview_voice.c
+++ b/aoview/aoview_voice.c
@@ -24,6 +24,8 @@ FILE	*aoview_flite;
 
 void aoview_voice_open(void)
 {
+	int	err;
+
 	if (!aoview_flite)
 		aoview_flite = aoview_flite_start();
 }
diff --git a/configure.ac b/configure.ac
index f55c7ec8..495e1185 100644
--- a/configure.ac
+++ b/configure.ac
@@ -57,6 +57,8 @@ PKG_CHECK_MODULES([GNOME], [gtk+-2.0 libglade-2.0 gconf-2.0])
 
 PKG_CHECK_MODULES([LIBUSB], [libusb-1.0])
 
+PKG_CHECK_MODULES([ALSA], [alsa])
+
 AC_OUTPUT([
 Makefile
 aoview/Makefile
-- 
2.30.2