From e3acf32e756e5c67961542d4422303eea7f9f379 Mon Sep 17 00:00:00 2001
From: Adrian Cochrane <adrian@openwork.nz>
Date: Thu, 9 Apr 2020 10:37:47 +1200
Subject: [PATCH] Insert audio cues.

---
 src/main.c | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/src/main.c b/src/main.c
index ed98750..6659a7c 100644
--- a/src/main.c
+++ b/src/main.c
@@ -43,11 +43,42 @@ int choose_format(char *path) {
     return SF_FORMAT_WAV;
 }
 
+int should_play(int type, const char *uri, const char *base) {
+    return strncmp(uri, "file:///", strlen("file:///"));
+}
+#define		BUFFER_LEN	1024
+#define		MAX_CHANNELS	6
+// FIXME convert samplerate
+int read_mono(SNDFILE *fd, SF_INFO *info, short *out) {
+    sf_count_t count = sf_read_short(fd, out, BUFFER_LEN);
+    if (info->channels == 1) return count;
+
+    int i = 0;
+    for (int j = 0; j < count; j += info->channels) out[i++] = out[j];
+    return i;
+}
+
 int synth_callback(short *wav, int numsamples, espeak_EVENT *events) {
     if (wav == NULL) return 0;
 
     while (events->type != 0) {
         if (events->type == espeakEVENT_SAMPLERATE) samplerate = events->id.number;
+        if (events->type == espeakEVENT_PLAY) {
+            SF_INFO info;
+            info.format = 0;
+            short buf[BUFFER_LEN];
+            int len;
+            SNDFILE *fd = sf_open(events->id.name + strlen("file://"), SFM_READ, &info);
+            if (fd == NULL || info.channels > MAX_CHANNELS) {
+                fprintf(stderr, "Failed to open %s: %s\n", events->id.name + strlen("file://"),
+                    sf_strerror(fd));
+                events++;
+                continue;
+            }
+            while ((len = read_mono(fd, &info, buf)) != 0)
+                sf_write_short(fd_wav, buf, len);
+            sf_close(fd);
+        }
         events++;
     }
 
@@ -74,6 +105,7 @@ int speak_initialize() {
 
     if (path_wav != NULL) {
         result = espeak_ng_InitializeOutput(ENOUTPUT_MODE_SYNCHRONOUS, 0, NULL);
+        espeak_SetUriCallback(should_play);
         espeak_SetSynthCallback(synth_callback);
     } else {
         result = espeak_ng_InitializeOutput(ENOUTPUT_MODE_SPEAK_AUDIO, 0, NULL);
-- 
2.30.2