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segment: Add an option for omitting the first header and final trailer

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This allows writing totally bare segments, without any header/trailer
included anywhere.

Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2012-10-02 23:59:35 +02:00
parent a854362b40
commit c864c3968a
1 changed files with 48 additions and 4 deletions
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52
libavformat/segment.c
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@ -41,6 +41,7 @@ typedef struct {
int size; /**< Set by a private option. */
int wrap; /**< Set by a private option. */
int individual_header_trailer; /**< Set by a private option. */
int write_header_trailer; /**< Set by a private option. */
int64_t offset_time;
int64_t recording_time;
int has_video;
@ -119,6 +120,26 @@ static int segment_end(AVFormatContext *oc, int write_trailer)
return ret;
}
static int open_null_ctx(AVIOContext **ctx)
{
int buf_size = 32768;
uint8_t *buf = av_malloc(buf_size);
if (!buf)
return AVERROR(ENOMEM);
*ctx = avio_alloc_context(buf, buf_size, AVIO_FLAG_WRITE, NULL, NULL, NULL, NULL);
if (!*ctx) {
av_free(buf);
return AVERROR(ENOMEM);
}
return 0;
}
static void close_null_ctx(AVIOContext *pb)
{
av_free(pb->buffer);
av_free(pb);
}
static int seg_write_header(AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
@ -128,6 +149,8 @@ static int seg_write_header(AVFormatContext *s)
seg->number = 0;
seg->offset_time = 0;
seg->recording_time = seg->time * 1000000;
if (!seg->write_header_trailer)
seg->individual_header_trailer = 0;
if (seg->list)
if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,
@ -166,15 +189,27 @@ static int seg_write_header(AVFormatContext *s)
goto fail;
}
if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
goto fail;
if (seg->write_header_trailer) {
if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
goto fail;
} else {
if ((ret = open_null_ctx(&oc->pb)) < 0)
goto fail;
}
if ((ret = avformat_write_header(oc, NULL)) < 0) {
avio_close(oc->pb);
goto fail;
}
if (!seg->write_header_trailer) {
close_null_ctx(oc->pb);
if ((ret = avio_open2(&oc->pb, oc->filename, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
goto fail;
}
if (seg->list) {
avio_printf(seg->pb, "%s\n", oc->filename);
avio_flush(seg->pb);
@ -244,7 +279,15 @@ static int seg_write_trailer(struct AVFormatContext *s)
{
SegmentContext *seg = s->priv_data;
AVFormatContext *oc = seg->avf;
int ret = segment_end(oc);
int ret;
if (!seg->write_header_trailer) {
ret = segment_end(oc, 0);
open_null_ctx(&oc->pb);
av_write_trailer(oc);
close_null_ctx(oc->pb);
} else {
ret = segment_end(oc, 1);
}
if (seg->list)
avio_close(seg->pb);
avformat_free_context(oc);
@ -260,6 +303,7 @@ static const AVOption options[] = {
{ "segment_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 5}, 0, INT_MAX, E },
{ "segment_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
{ "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
{ "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_INT, {.i64 = 1}, 0, 1, E },
{ NULL },
};