avformat/hlsenc: deprecate hls_wrap option

When user use the hls_wrap, there have many problem:
1. some platform refersh the old but usefull segment
2. CDN(Content Delivery Network) Deliver HLS not friendly

The hls_wrap is used to wrap segments for use little space,
now user can use hls_list_size and hls_flags delete_segments
instead it.
Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Reviewed-by: Carl Eugen Hoyos <ceffmpeg@gmail.com>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>

doc/muxers.texi

@@ -442,9 +442,8 @@ parameters. Values containing @code{:} special characters must be
 escaped.
 
 @item hls_wrap @var{wrap}
-Set the number after which the segment filename number (the number
-specified in each segment file) wraps. If set to 0 the number will be
-never wrapped. Default value is 0.
+This is a deprecated option, you can use @code {hls_list_size}
+and @code{hls_flags delete_segments} instead it
 
 This option is useful to avoid to fill the disk with many segment
 files, and limits the maximum number of segment files written to disk

libavformat/hlsenc.c

@@ -101,7 +101,9 @@ typedef struct HLSContext {
     float time;            // Set by a private option.
     float init_time;       // Set by a private option.
     int max_nb_segments;   // Set by a private option.
+#if FF_API_HLS_WRAP
     int  wrap;             // Set by a private option.
+#endif
     uint32_t flags;        // enum HLSFlags
     uint32_t pl_type;      // enum PlaylistType
     char *segment_filename;
@@ -566,7 +568,11 @@ static int hls_append_segment(struct AVFormatContext *s, HLSContext *hls, double
         hls->initial_prog_date_time += en->duration;
         hls->segments = en->next;
         if (en && hls->flags & HLS_DELETE_SEGMENTS &&
+#if FF_API_HLS_WRAP
                 !(hls->flags & HLS_SINGLE_FILE || hls->wrap)) {
+#else
+                !(hls->flags & HLS_SINGLE_FILE)) {
+#endif
             en->next = hls->old_segments;
             hls->old_segments = en;
             if ((ret = hls_delete_old_segments(hls)) < 0)
@@ -834,7 +840,11 @@ static int hls_start(AVFormatContext *s)
                   sizeof(vtt_oc->filename));
     } else if (c->max_seg_size > 0) {
         if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
+#if FF_API_HLS_WRAP
             c->basename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+#else
+            c->basename, 'd', c->sequence) < 1) {
+#endif
                 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s', you can try to use -use_localtime 1 with it\n", c->basename);
                 return AVERROR(EINVAL);
         }
@@ -853,7 +863,11 @@ static int hls_start(AVFormatContext *s)
                 if (!filename)
                     return AVERROR(ENOMEM);
                 if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
+#if FF_API_HLS_WRAP
                     filename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+#else
+                    filename, 'd', c->sequence) < 1) {
+#endif
                     av_log(c, AV_LOG_ERROR,
                            "Invalid second level segment filename template '%s', "
                             "you can try to remove second_level_segment_index flag\n",
@@ -910,13 +924,21 @@ static int hls_start(AVFormatContext *s)
                 av_free(fn_copy);
             }
         } else if (replace_int_data_in_filename(oc->filename, sizeof(oc->filename),
+#if FF_API_HLS_WRAP
                    c->basename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+#else
+                   c->basename, 'd', c->sequence) < 1) {
+#endif
             av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s' you can try to use -use_localtime 1 with it\n", c->basename);
             return AVERROR(EINVAL);
         }
         if( c->vtt_basename) {
             if (replace_int_data_in_filename(vtt_oc->filename, sizeof(vtt_oc->filename),
+#if FF_API_HLS_WRAP
                 c->vtt_basename, 'd', c->wrap ? c->sequence % c->wrap : c->sequence) < 1) {
+#else
+                c->vtt_basename, 'd', c->sequence) < 1) {
+#endif
                 av_log(vtt_oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", c->vtt_basename);
                 return AVERROR(EINVAL);
             }
@@ -1421,7 +1443,9 @@ static const AVOption options[] = {
     {"hls_list_size", "set maximum number of playlist entries",  OFFSET(max_nb_segments),    AV_OPT_TYPE_INT,    {.i64 = 5},     0, INT_MAX, E},
     {"hls_ts_options","set hls mpegts list of options for the container format used for hls", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
     {"hls_vtt_options","set hls vtt list of options for the container format used for hls", OFFSET(vtt_format_options_str), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,    E},
-    {"hls_wrap",      "set number after which the index wraps",  OFFSET(wrap),    AV_OPT_TYPE_INT,    {.i64 = 0},     0, INT_MAX, E},
+#if FF_API_HLS_WRAP
+    {"hls_wrap",      "set number after which the index wraps (will be deprecated)",  OFFSET(wrap),    AV_OPT_TYPE_INT,    {.i64 = 0},     0, INT_MAX, E},
+#endif
     {"hls_allow_cache", "explicitly set whether the client MAY (1) or MUST NOT (0) cache media segments", OFFSET(allowcache), AV_OPT_TYPE_INT, {.i64 = -1}, INT_MIN, INT_MAX, E},
     {"hls_base_url",  "url to prepend to each playlist entry",   OFFSET(baseurl), AV_OPT_TYPE_STRING, {.str = NULL},  0, 0,       E},
     {"hls_segment_filename", "filename template for segment files", OFFSET(segment_filename),   AV_OPT_TYPE_STRING, {.str = NULL},            0,       0,         E},

libavformat/version.h

@@ -85,6 +85,10 @@
 #ifndef FF_API_HTTP_USER_AGENT
 #define FF_API_HTTP_USER_AGENT          (LIBAVFORMAT_VERSION_MAJOR < 58)
 #endif
+#ifndef FF_API_HLS_WRAP
+#define FF_API_HLS_WRAP                 (LIBAVFORMAT_VERSION_MAJOR < 58)
+#endif
+
 
 #ifndef FF_API_R_FRAME_RATE
 #define FF_API_R_FRAME_RATE            1