avcodec/srtenc: don't produce SRT files with mixed line endings

Initially, avcodec/srtenc.c was outputting CRLF [1]. Later, a real SRT
muxer was added [2], which outputs LF. The original srtenc.c was
converted to use the muxer [3], changing its output to LF, except for
newline characters within subtitle text.

Fix this to avoid producing SRT files with mixed line endings.

[1] 8e43b6fed9
[2] 9e63c30daa
[3] 55180b3299

Signed-off-by: Kacper Michajłow <kasper93@gmail.com>

libavcodec/srtenc.c

@@ -145,7 +145,7 @@ static void srt_text_cb(void *priv, const char *text, int len)
 
 static void srt_new_line_cb(void *priv, int forced)
 {
-    srt_print(priv, "\r\n");
+    srt_print(priv, "\n");
 }
 
 static void srt_style_cb(void *priv, char style, int close)

tests/ref/fate/ffmpeg-fix_sub_duration_heartbeat

@@ -20,16 +20,16 @@
 
 6
 00:00:03,103 --> 00:00:03,303
-<font face="Monospace">{\an7}(<i> inaudible radio chatter</i> )
+<font face="Monospace">{\an7}(<i> inaudible radio chatter</i> )
 >></font>
 
 7
 00:00:03,303 --> 00:00:03,503
-<font face="Monospace">{\an7}(<i> inaudible radio chatter</i> )
+<font face="Monospace">{\an7}(<i> inaudible radio chatter</i> )
 >> Safety rema</font>
 
 8
 00:00:03,504 --> 00:00:03,704
-<font face="Monospace">{\an7}(<i> inaudible radio chatter</i> )
+<font face="Monospace">{\an7}(<i> inaudible radio chatter</i> )
 >> Safety remains our numb</font>
 

tests/ref/fate/sub-subripenc

@@ -1,6 +1,6 @@
 1
 00:00:00,970 --> 00:00:02,540
-<font face="Serif" size="18">- Test 1.
+<font face="Serif" size="18">- Test 1.
 - Test 2.</font>
 
 2
@@ -9,6 +9,6 @@
 
 3
 00:00:05,850 --> 00:00:08,140
-<font face="Serif" size="18">- Test 4.
+<font face="Serif" size="18">- Test 4.
 - Test 5.</font>
 

tests/ref/fate/sub-textenc

@@ -4,11 +4,11 @@ Don't show this text it may be used to insert hidden data
 
 2
 00:00:01,500 --> 00:00:04,500
-SubRip subtitles capability tester 1.3o by ale5000
-Use VLC 1.1 or higher as reference for most things and MPC Home Cinema for others
-This text should be blue
-This text should be red
-This text should be black
+SubRip subtitles capability tester 1.3o by ale5000
+Use VLC 1.1 or higher as reference for most things and MPC Home Cinema for others
+This text should be blue
+This text should be red
+This text should be black
 If you see this with the normal font, the player don't (fully) support font face
 
 3
@@ -17,43 +17,43 @@ Hidden
 
 4
 00:00:04,501 --> 00:00:07,500
-This text should be small
-This text should be normal
+This text should be small
+This text should be normal
 This text should be big
 
 5
 00:00:07,501 --> 00:00:11,500
-This should be an E with an accent: È
-日本語
-This text should be bold, italics and underline
-This text should be small and green
-This text should be small and red
+This should be an E with an accent: È
+日本語
+This text should be bold, italics and underline
+This text should be small and green
+This text should be small and red
 This text should be big and brown
 
 6
 00:00:11,501 --> 00:00:14,500
-This line should be bold
-This line should be italics
-This line should be underline
-This line should be strikethrough
-Both lines
+This line should be bold
+This line should be italics
+This line should be underline
+This line should be strikethrough
+Both lines
 should be underline
 
 7
 00:00:14,501 --> 00:00:17,500
->
-It would be a good thing to
-hide invalid html tags that are closed and show the text in them
-but show un-closed invalid html tags
-Show not opened tags
+>
+It would be a good thing to
+hide invalid html tags that are closed and show the text in them
+but show un-closed invalid html tags
+Show not opened tags
 <
 
 8
 00:00:17,501 --> 00:00:20,500
-and also
-hide invalid html tags with parameters that are closed and show the text in them
-but show un-closed invalid html tags
-This text should be showed underlined without problems also: 2<3,5>1,4<6
+and also
+hide invalid html tags with parameters that are closed and show the text in them
+but show un-closed invalid html tags
+This text should be showed underlined without problems also: 2<3,5>1,4<6
 This shouldn't be underlined
 
 9
@@ -66,49 +66,49 @@ This text should NOT be in the normal position
 
 11
 00:00:22,501 --> 00:00:24,500
-Implementation is the same of the ASS tag
-This text should be at the
+Implementation is the same of the ASS tag
+This text should be at the
 top and horizontally centered
 
 12
 00:00:22,501 --> 00:00:24,500
-This text should be at the
+This text should be at the
 middle and horizontally centered
 
 13
 00:00:22,501 --> 00:00:24,500
-This text should be at the
+This text should be at the
 bottom and horizontally centered
 
 14
 00:00:24,501 --> 00:00:26,500
-This text should be at the
+This text should be at the
 top and horizontally at the left
 
 15
 00:00:24,501 --> 00:00:26,500
-This text should be at the
-middle and horizontally at the left
+This text should be at the
+middle and horizontally at the left
 (The second position must be ignored)
 
 16
 00:00:24,501 --> 00:00:26,500
-This text should be at the
+This text should be at the
 bottom and horizontally at the left
 
 17
 00:00:26,501 --> 00:00:28,500
-This text should be at the
+This text should be at the
 top and horizontally at the right
 
 18
 00:00:26,501 --> 00:00:28,500
-This text should be at the
+This text should be at the
 middle and horizontally at the right
 
 19
 00:00:26,501 --> 00:00:28,500
-This text should be at the
+This text should be at the
 bottom and horizontally at the right
 
 20
@@ -137,7 +137,7 @@ Fifth, it should replace third
 
 26
 00:00:45,501 --> 00:00:50,500
-Sixth, it shouldn't be
+Sixth, it shouldn't be
 showed overlapped
 
 27
@@ -150,64 +150,64 @@ text 2
 
 29
 00:00:52,501 --> 00:00:54,500
-Hide these tags:
-also hide these tags:
+Hide these tags:
+also hide these tags:
 but show this: {normal text}
 
 30
 00:00:54,501 --> 00:01:00,500
-
-\ N is a forced line break
-\ h is a hard space
-Normal spaces at the start and at the end of the line are trimmed while hard spaces are not trimmed.
+
+\ N is a forced line break
+\ h is a hard space
+Normal spaces at the start and at the end of the line are trimmed while hard spaces are not trimmed.
 The\hline\hwill\hnever\hbreak\hautomatically\hright\hbefore\hor\hafter\ha\hhard\hspace.\h:-D
 
 31
 00:00:54,501 --> 00:00:56,500
-
-\h\h\h\h\hA (05 hard spaces followed by a letter)
-A (Normal  spaces followed by a letter)
+
+\h\h\h\h\hA (05 hard spaces followed by a letter)
+A (Normal  spaces followed by a letter)
 A (No hard spaces followed by a letter)
 
 32
 00:00:56,501 --> 00:00:58,500
-\h\h\h\h\hA (05 hard spaces followed by a letter)
-A (Normal  spaces followed by a letter)
-A (No hard spaces followed by a letter)
+\h\h\h\h\hA (05 hard spaces followed by a letter)
+A (Normal  spaces followed by a letter)
+A (No hard spaces followed by a letter)
 Show this: \TEST and this: \-)
 
 33
 00:00:58,501 --> 00:01:00,500
-
-A letter followed by 05 hard spaces: A\h\h\h\h\h
-A letter followed by normal  spaces: A
-A letter followed by no hard spaces: A
-05 hard  spaces between letters: A\h\h\h\h\hA
-5 normal spaces between letters: A     A
-
+
+A letter followed by 05 hard spaces: A\h\h\h\h\h
+A letter followed by normal  spaces: A
+A letter followed by no hard spaces: A
+05 hard  spaces between letters: A\h\h\h\h\hA
+5 normal spaces between letters: A     A
+
 ^--Forced line break
 
 34
 00:01:00,501 --> 00:01:02,500
-Both line should be strikethrough,
-yes.
-Correctly closed tags
+Both line should be strikethrough,
+yes.
+Correctly closed tags
 should be hidden.
 
 35
 00:01:02,501 --> 00:01:04,500
-It shouldn't be strikethrough,
-not opened tag showed as text.
+It shouldn't be strikethrough,
+not opened tag showed as text.
 Not opened tag showed as text.
 
 36
 00:01:04,501 --> 00:01:06,500
-Three lines should be strikethrough,
-yes.
+Three lines should be strikethrough,
+yes.
 Not closed tags showed as text
 
 37
 00:01:06,501 --> 00:01:08,500
-Both line should be strikethrough but
+Both line should be strikethrough but
 the wrong closing tag should be showed