[FFmpeg-devel] [PATCH] lavf/dashenc.c: Fix creating audio-only HLS playlists

[Przemysław Sobala]

With audio/video HLS playlists, audio chunklists are treated as
alternative renditions for video chunklists. This is wrong for
audio-only HLS playlists.

fixes: 9252

Please correct indentation of introduced if statement's body, before
applying.
---
 libavformat/dashenc.c | 39 +++++++++++++++++++++++++++++++++++----
 1 file changed, 35 insertions(+), 4 deletions(-)

diff --git a/libavformat/dashenc.c b/libavformat/dashenc.c
index 07f191e2a2..c5da02840b 100644
--- a/libavformat/dashenc.c
+++ b/libavformat/dashenc.c
@@ -1256,10 +1256,6 @@ static int write_manifest(AVFormatContext *s, int final)
 
     if (c->hls_playlist) {
         char filename_hls[1024];
-        const char *audio_group = "A1";
-        char audio_codec_str[128] = "\0";
-        int is_default = 1;
-        int max_audio_bitrate = 0;
 
         // Publish master playlist only the configured rate
         if (c->master_playlist_created && (!c->master_publish_rate ||
@@ -1282,6 +1278,13 @@ static int write_manifest(AVFormatContext *s, int final)
 
         ff_hls_write_playlist_version(c->m3u8_out, 7);
 
+        if (c->has_video) {
+            // treat audio streams as alternative renditions for video streams
+            const char *audio_group = "A1";
+            char audio_codec_str[128] = "\0";
+            int is_default = 1;
+            int max_audio_bitrate = 0;
+
             for (i = 0; i < s->nb_streams; i++) {
                 char playlist_file[64];
                 AVStream *st = s->streams[i];
@@ -1336,6 +1339,34 @@ static int write_manifest(AVFormatContext *s, int final)
                                         playlist_file, agroup,
                                         codec_str_ptr, NULL, NULL);
             }
+
+        } else {
+            // treat audio streams as separate renditions
+
+            for (i = 0; i < s->nb_streams; i++) {
+                char playlist_file[64];
+                char codec_str[128];
+                AVStream *st = s->streams[i];
+                OutputStream *os = &c->streams[i];
+                int stream_bitrate = os->muxer_overhead;
+                if (os->bit_rate > 0)
+                    stream_bitrate += os->bit_rate;
+                else if (final)
+                    stream_bitrate += os->pos * 8 * AV_TIME_BASE / c->total_duration;
+                else if (os->first_segment_bit_rate > 0)
+                    stream_bitrate += os->first_segment_bit_rate;
+                if (st->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
+                    continue;
+                if (os->segment_type != SEGMENT_TYPE_MP4)
+                    continue;
+                av_strlcpy(codec_str, os->codec_str, sizeof(codec_str));
+                get_hls_playlist_name(playlist_file, sizeof(playlist_file), NULL, i);
+                ff_hls_write_stream_info(st, c->m3u8_out, stream_bitrate,
+                                        playlist_file, NULL,
+                                        codec_str, NULL, NULL);
+            }
+        }
+
         dashenc_io_close(s, &c->m3u8_out, temp_filename);
         if (use_rename)
             if ((ret = ff_rename(temp_filename, filename_hls, s)) < 0)
-- 
2.31.1