fixed different voice quality while using playht (#111)

mod_custom_tts/custom_glue.cpp

@@ -451,12 +451,12 @@ static size_t write_cb(void *ptr, size_t size, size_t nmemb, ConnInfo_t *conn) {
       return 0;
     }
 
-    /* cache file will stay in the mp3 format for size (smaller) and simplicity */
-    if (conn->file) fwrite(data, sizeof(uint8_t), bytes_received, conn->file);
-
     pcm_data = convert_mp3_to_linear(conn, data, bytes_received);
     size_t bytesResampled = pcm_data.size() * sizeof(uint16_t);
 
+    /* cache same data to avoid streaming and cached audio quality is different*/
+    if (conn->file) fwrite(pcm_data.data(), sizeof(uint8_t), bytesResampled, conn->file);
+
     // Resize the buffer if necessary
     if (cBuffer->capacity() - cBuffer->size() < (bytesResampled / sizeof(uint16_t))) {
       //switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "write_cb growing buffer\n"); 

mod_playht_tts/playht_glue.cpp

@@ -452,12 +452,12 @@ static size_t write_cb(void *ptr, size_t size, size_t nmemb, ConnInfo_t *conn) {
       return 0;
     }
 
-    /* cache file will stay in the mp3 format for size (smaller) and simplicity */
-    if (conn->file) fwrite(data, sizeof(uint8_t), bytes_received, conn->file);
-
     pcm_data = convert_mp3_to_linear(conn, data, bytes_received);
     size_t bytesResampled = pcm_data.size() * sizeof(uint16_t);
 
+    /* cache same data to avoid streaming and cached audio quality is different*/
+    if (conn->file) fwrite(pcm_data.data(), sizeof(uint8_t), bytesResampled, conn->file);
+
     // Resize the buffer if necessary
     if (cBuffer->capacity() - cBuffer->size() < (bytesResampled / sizeof(uint16_t))) {
       //switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "write_cb growing buffer\n");