render manifest ffmpeg progress like standard download bars

internal/download/downloader_test.go

@@ -74,7 +74,6 @@ func TestDeezerBlowfishKeyDerivation(t *testing.T) {
 	}
 }
 
-
 func TestFileDeezerEncrypted(t *testing.T) {
 	trackID := "3135556"
 	plain := make([]byte, deezerBFChunkSize+777)
@@ -221,6 +220,36 @@ func TestParseFFmpegDurationLine(t *testing.T) {
 	}
 }
 
+func TestParseFFmpegDurationBitrateBPS(t *testing.T) {
+	bps, ok := parseFFmpegDurationBitrateBPS("  Duration: 00:04:52.57, start: 0.000000, bitrate: 975 kb/s")
+	if !ok {
+		t.Fatalf("expected bitrate parse to succeed")
+	}
+	if want := int64(975000); bps != want {
+		t.Fatalf("unexpected bitrate: got=%d want=%d", bps, want)
+	}
+}
+
+func TestParseFFmpegProgressBitrateBPS(t *testing.T) {
+	bps, ok := parseFFmpegProgressBitrateBPS("bitrate=1706.8kbits/s")
+	if !ok {
+		t.Fatalf("expected progress bitrate parse to succeed")
+	}
+	if want := int64(1706800); bps != want {
+		t.Fatalf("unexpected bitrate: got=%d want=%d", bps, want)
+	}
+}
+
+func TestParseFFmpegTotalSize(t *testing.T) {
+	size, ok := parseFFmpegTotalSize("total_size=1234567")
+	if !ok {
+		t.Fatalf("expected total_size parse to succeed")
+	}
+	if want := int64(1234567); size != want {
+		t.Fatalf("unexpected total_size: got=%d want=%d", size, want)
+	}
+}
+
 func TestParseFFmpegOutTime(t *testing.T) {
 	currentMS, ok := parseFFmpegOutTime("out_time=00:01:02.340000")
 	if !ok {
@@ -240,6 +269,20 @@ func TestParseClockDurationMSInvalid(t *testing.T) {
 	}
 }
 
+func TestEstimateTotalBytesFromBitrate(t *testing.T) {
+	total := estimateTotalBytesFromBitrate(10000, 1600000)
+	if want := int64(2000000); total != want {
+		t.Fatalf("unexpected estimate from bitrate: got=%d want=%d", total, want)
+	}
+}
+
+func TestEstimateTotalBytesFromProgress(t *testing.T) {
+	total := estimateTotalBytesFromProgress(10000, 2500, 500000)
+	if want := int64(2000000); total != want {
+		t.Fatalf("unexpected estimate from progress: got=%d want=%d", total, want)
+	}
+}
+
 func TestBuildFFmpegStreamArgsAudioOnly(t *testing.T) {
 	args := buildFFmpegStreamArgs("https://example.com/master.m3u8", "/tmp/out.m4a", false)
 	if !containsArgPair(args, "-map", "0:a:0") {