2017-02-01 4:29 GMT+08:00 Aman Gupta <ffm...@tmm1.net>:
> From: Aman Gupta <a...@tmm1.net>
>
> Adds a `-hls_flags +temp_file` which will write segment data to
> filename.tmp, and then rename to filename when the segment is complete
> and before the file is added to the m3u8 playlist.
>
> This patch is similar in spirit to one used in Plex's ffmpeg fork, and
> allows a transcoding webserver to ensure incomplete segment files are
> never served up accidentally.
> ---
> libavformat/hlsenc.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/libavformat/hlsenc.c b/libavformat/hlsenc.c
> index bd1e684..23b9011 100644
> --- a/libavformat/hlsenc.c
> +++ b/libavformat/hlsenc.c
> @@ -76,6 +76,7 @@ typedef enum HLSFlags {
> HLS_SECOND_LEVEL_SEGMENT_INDEX = (1 << 8), // include segment index
> in segment filenames when use_localtime e.g.: %%03d
> HLS_SECOND_LEVEL_SEGMENT_DURATION = (1 << 9), // include segment
> duration (microsec) in segment filenames when use_localtime e.g.: %%09t
> HLS_SECOND_LEVEL_SEGMENT_SIZE = (1 << 10), // include segment size
> (bytes) in segment filenames when use_localtime e.g.: %%014s
> + HLS_TEMP_FILE = (1 << 11),
> } HLSFlags;
>
> typedef enum {
> @@ -915,6 +916,10 @@ static int hls_start(AVFormatContext *s)
>
> set_http_options(&options, c);
>
> + if (c->flags & HLS_TEMP_FILE) {
> + av_strlcat(oc->filename, ".tmp", sizeof(oc->filename));
> + }
> +
> if (c->key_info_file) {
> if ((err = hls_encryption_start(s)) < 0)
> goto fail;
> @@ -1276,6 +1281,15 @@ static int hls_write_packet(AVFormatContext *s,
> AVPacket *pkt)
>
> av_write_frame(oc, NULL); /* Flush any buffered data */
>
> + if (hls->flags & HLS_TEMP_FILE) {
> + size_t len = strlen(oc->filename);
> + char final_filename[sizeof(oc->filename)];
> + av_strlcpy(final_filename, oc->filename, len);
> + final_filename[len-4] = '\0';
> + ff_rename(oc->filename, final_filename, s);
> + oc->filename[len-4] = '\0';
> + }
> +
> new_start_pos = avio_tell(hls->avf->pb);
> hls->size = new_start_pos - hls->start_pos;
> ret = hls_append_segment(s, hls, hls->duration, hls->start_pos,
> hls->size);
> @@ -1406,6 +1420,7 @@ static const AVOption options[] = {
> {"hls_subtitle_path", "set path of hls subtitles",
> OFFSET(subtitle_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E},
> {"hls_flags", "set flags affecting HLS playlist and media file
> generation", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0 }, 0, UINT_MAX, E,
> "flags"},
> {"single_file", "generate a single media file indexed with byte
> ranges", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_SINGLE_FILE }, 0, UINT_MAX, E,
> "flags"},
> + {"temp_file", "write segment to temporary file and rename when
> complete", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_TEMP_FILE }, 0, UINT_MAX, E,
> "flags"},
> {"delete_segments", "delete segment files that are no longer part of
> the playlist", 0, AV_OPT_TYPE_CONST, {.i64 = HLS_DELETE_SEGMENTS }, 0,
> UINT_MAX, E, "flags"},
> {"round_durations", "round durations in m3u8 to whole numbers", 0,
> AV_OPT_TYPE_CONST, {.i64 = HLS_ROUND_DURATIONS }, 0, UINT_MAX, E,
> "flags"},
> {"discont_start", "start the playlist with a discontinuity tag", 0,
> AV_OPT_TYPE_CONST, {.i64 = HLS_DISCONT_START }, 0, UINT_MAX, E, "flags"},
> --
> 2.10.1 (Apple Git-78)
>
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> ffmpeg-devel@ffmpeg.org
> http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
Why use temp filename?
There have no info in m3u8 list before the segment complete.
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