give raw time remaining estimate based on rate

03e9fbf3703 fix: Use Opus in the CBR mode

git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 03e9fbf3703e430d21138c4f69e9ac7dbefb7564

external/toxcore/c-toxcore/toxav/audio.c

@@ -377,6 +377,21 @@ static OpusEncoder *create_audio_encoder(const Logger *log, uint32_t bit_rate, u
         goto FAILURE;
     }
 
+    /*
+     * The libopus library defaults to VBR, which is unsafe in any VoIP environment
+     * (see for example doi:10.1109/SP.2011.34). Switching to CBR very slightly
+     * decreases audio quality at lower bitrates.
+     *
+     * Parameters:
+     *  `[in]`    `x`   `opus_int32`: Whether to use VBR mode, 1 (VBR) is default
+     */
+    status = opus_encoder_ctl(rc, OPUS_SET_VBR(0));
+
+    if (status != OPUS_OK) {
+        LOGGER_ERROR(log, "Error while setting encoder ctl: %s", opus_strerror(status));
+        goto FAILURE;
+    }
+
     /*
      * Configures the encoder's use of inband forward error correction.
      * Note:

src/chat_gui4.cpp

@@ -1042,11 +1042,16 @@ void ChatGui4::renderMessageBodyFile(Message3Registry& reg, const Message3 e) {
 
 		float fraction = float(total) / total_size;
 
-		char overlay_buf[32];
+		char overlay_buf[64];
 		if (rate > 0.000001f) {
 			const char* byte_suffix = "???";
 			int64_t byte_divider = sizeToHumanReadable(rate, byte_suffix);
-			std::snprintf(overlay_buf, sizeof(overlay_buf), "%.1f%% @ %.1f%s/s", fraction * 100 + 0.01f, rate/byte_divider, byte_suffix);
+			int64_t seconds_remaining = (total_size - total) / rate;
+			if (seconds_remaining > 0) {
+				std::snprintf(overlay_buf, sizeof(overlay_buf), "%.1f%% @ %.1f%s/s %lds ", fraction * 100 + 0.01f, rate/byte_divider, byte_suffix, seconds_remaining);
+			} else {
+				std::snprintf(overlay_buf, sizeof(overlay_buf), "%.1f%% @ %.1f%s/s", fraction * 100 + 0.01f, rate/byte_divider, byte_suffix);
+			}
 		} else {
 			std::snprintf(overlay_buf, sizeof(overlay_buf), "%.1f%%", fraction * 100 + 0.01f);
 		}