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libavformat/segment: add an option to write the header to a separate file

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This permits some interesting segmenting techniques with formats like Matroska,
where you can concatenate the header and segments [N, nb_segments) and get
a working file that starts at segment N's start time.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Rodger Combs 2015-03-28 19:25:20 -06:00 committed by Michael Niedermayer
parent 481f0f153a
commit 7b060a96ad
1 changed files with 15 additions and 3 deletions
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18
libavformat/segment.c
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@ -105,6 +105,7 @@ typedef struct SegmentContext {
int64_t time_delta;
int individual_header_trailer; /**< Set by a private option. */
int write_header_trailer; /**< Set by a private option. */
char *header_filename; ///< filename to write the output header to
int reset_timestamps; ///< reset timestamps at the begin of each segment
int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
@ -593,6 +594,11 @@ static int seg_write_header(AVFormatContext *s)
if (!seg->write_header_trailer)
seg->individual_header_trailer = 0;
if (seg->header_filename) {
seg->write_header_trailer = 1;
seg->individual_header_trailer = 0;
}
if (!!seg->time_str + !!seg->times_str + !!seg->frames_str > 1) {
av_log(s, AV_LOG_ERROR,
"segment_time, segment_times, and segment_frames options "
@ -669,7 +675,7 @@ static int seg_write_header(AVFormatContext *s)
goto fail;
if (seg->write_header_trailer) {
if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
if ((ret = avio_open2(&oc->pb, seg->header_filename ? seg->header_filename : oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0) {
av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->filename);
goto fail;
@ -704,8 +710,13 @@ static int seg_write_header(AVFormatContext *s)
if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
s->avoid_negative_ts = 1;
if (!seg->write_header_trailer) {
close_null_ctxp(&oc->pb);
if (!seg->write_header_trailer || seg->header_filename) {
if (seg->header_filename) {
av_write_frame(oc, NULL);
avio_closep(&oc->pb);
} else {
close_null_ctxp(&oc->pb);
}
if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
goto fail;
@ -877,6 +888,7 @@ static const AVOption options[] = {
{ "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_format_options", "set list of options for the container format used for the segments", OFFSET(format_options_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_list_flags","set flags affecting segment list generation", OFFSET(list_flags), AV_OPT_TYPE_FLAGS, {.i64 = SEGMENT_LIST_FLAG_CACHE }, 0, UINT_MAX, E, "list_flags"},
{ "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},