From ba025f66532913d20604e74ab7b4530d8b3caacf Mon Sep 17 00:00:00 2001
From: XANTRONIX Development
Date: Wed, 2 Feb 2022 00:39:40 -0500
Subject: Add synths to examples/say.c

---
 examples/say.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 95 insertions(+), 16 deletions(-)

diff --git a/examples/say.c b/examples/say.c
index 92d2b19..d72c7ff 100644
--- a/examples/say.c
+++ b/examples/say.c
@@ -9,8 +9,19 @@
 #include <xas/audio.h>
 #include <xas/mixer.h>
 #include <xas/riff.h>
+#include <xas/synth.h>
 #include <xas/vox.h>
 
+#define SYNTH_STATUS_CLEAR  0
+#define SYNTH_STATUS_ON    (1 << 0)
+
+typedef struct _synth_sine {
+    int flags;
+    float phase;
+
+    size_t frequency;
+} synth_sine;
+
 static void usage(int argc, char **argv, const char *message, ...) {
     va_list args;
 
@@ -28,31 +39,53 @@ static void usage(int argc, char **argv, const char *message, ...) {
     exit(EX_USAGE);
 }
 
+static int16_t sine_sample(xas_synth *synth, synth_sine *sine) {
+    int16_t ret;
+    static float tau = 2.0f * M_PI;
+
+    if (sine->flags & SYNTH_STATUS_ON) {
+        ret = (int16_t)roundf((INT16_MAX >> 2) * sinf(sine->phase));
+
+        sine->phase += tau / (synth->sample_rate / sine->frequency);
+
+        if (sine->phase > tau) {
+            sine->phase -= tau;
+        }
+    } else {
+        ret = 0;
+    }
+
+    return ret;
+}
+
+static void sine_cleanup(xas_synth *synth, synth_sine *sine) {
+    return;
+}
+
 int main(int argc, char **argv) {
+    synth_sine sine_channels[2] = {
+        { SYNTH_STATUS_ON, 0.0f, 220 },
+        { SYNTH_STATUS_ON, 0.0f, 420 },
+    };
+
     xas_mixer *mixer;
 
     xas_audio_stream *input,
+                       *synth_l,
+                       *synth_r,
                        *output;
 
     xas_vox *vox;
 
-    size_t sample_rate = 44100,
-           buffer_size =  4096,
-           duration_s  =    60,
+    size_t sample_rate     = 44100,
+           buffer_size     =   735,
+           duration_frames =  3600,
            i;
 
     if (argc != 2) {
         usage(argc, argv, "No output file provided");
     }
 
-    if ((output = xas_riff_new_file(argv[1],
-                                      XAS_AUDIO_STREAM_PCM_16_BIT,
-                                      sample_rate,
-                                      XAS_AUDIO_STREAM_STEREO,
-                                      O_WRONLY | O_CREAT | O_TRUNC)) == NULL) {
-        goto error_riff_new_file;
-    }
-
     if ((vox = xas_vox_new("/usr/bin/text2wave",
                              XAS_AUDIO_STREAM_PCM_16_BIT,
                              sample_rate,
@@ -61,10 +94,36 @@ int main(int argc, char **argv) {
         goto error_vox_new;
     }
 
+    if ((output = xas_riff_new_file(argv[1],
+                                      XAS_AUDIO_STREAM_PCM_16_BIT,
+                                      sample_rate,
+                                      XAS_AUDIO_STREAM_STEREO,
+                                      O_WRONLY | O_CREAT | O_TRUNC)) == NULL) {
+        goto error_riff_new_file;
+    }
+
     if ((input = xas_vox_stream_new(vox)) == NULL) {
         goto error_vox_stream_new;
     }
 
+    if ((synth_l = xas_synth_new(XAS_AUDIO_STREAM_PCM_16_BIT,
+                                   sample_rate,
+                                   buffer_size,
+                                   (xas_synth_callback_sample)sine_sample,
+                                   (xas_synth_callback_cleanup)sine_cleanup,
+                                   &sine_channels[0])) == NULL) {
+        goto error_synth_new_l;
+    }
+
+    if ((synth_r = xas_synth_new(XAS_AUDIO_STREAM_PCM_16_BIT,
+                                   sample_rate,
+                                   buffer_size,
+                                   (xas_synth_callback_sample)sine_sample,
+                                   (xas_synth_callback_cleanup)sine_cleanup,
+                                   &sine_channels[1])) == NULL) {
+        goto error_synth_new_r;
+    }
+
     if ((mixer = xas_mixer_new(XAS_AUDIO_STREAM_PCM_16_BIT,
                                  sample_rate,
                                  XAS_AUDIO_STREAM_STEREO,
@@ -72,13 +131,23 @@ int main(int argc, char **argv) {
         goto error_mixer_new;
     }
 
-    if (xas_mixer_input_add(mixer, input, 1.0, -1.0) == NULL) {
+    if (xas_mixer_input_add(mixer, input, 1.0, 0.0) == NULL) {
+        goto error_mixer_input_add;
+    }
+
+    if (xas_mixer_input_add(mixer, synth_l, 0.5, -1.0) == NULL) {
+        goto error_mixer_input_add;
+    }
+
+    if (xas_mixer_input_add(mixer, synth_r, 0.5, 1.0) == NULL) {
         goto error_mixer_input_add;
     }
 
     xas_vox_say(vox, "I want to eat your soul.  You don't understand.  I really want to eat your soul.\n");
 
-    for (i=0; i<duration_s; i++) {
+    xas_vox_generate(vox);
+
+    for (i=0; i<duration_frames; i++) {
         void *buf;
         ssize_t readlen;
 
@@ -96,9 +165,13 @@ int main(int argc, char **argv) {
     xas_audio_stream_flush(output);
 
     xas_mixer_destroy(mixer);
+    xas_audio_stream_destroy(synth_r);
+    xas_audio_stream_destroy(synth_l);
     xas_audio_stream_destroy(input);
     xas_audio_stream_destroy(output);
 
+    xas_vox_destroy(vox);
+
     return EX_OK;
 
 error_audio_stream_write:
@@ -107,14 +180,20 @@ error_mixer_input_add:
     xas_mixer_destroy(mixer);
 
 error_mixer_new:
+    xas_audio_stream_destroy(synth_r);
+
+error_synth_new_r:
+    xas_audio_stream_destroy(synth_l);
+
+error_synth_new_l:
     xas_audio_stream_destroy(input);
 
 error_vox_stream_new:
-    xas_vox_destroy(vox);
-
-error_vox_new:
     xas_audio_stream_destroy(output);
 
 error_riff_new_file:
+    xas_vox_destroy(vox);
+
+error_vox_new:
     return EX_OSERR;
 }
-- 
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