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Bug 792404 - Add nestegg_offset_seek to enable stream switching for DASH-WebM r=kinetik

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This commit is contained in:
Steve Workman 2012-12-06 15:26:44 -08:00
parent e1bb45ee7a
commit 1a3794f87e
4 changed files with 33 additions and 12 deletions
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1
layout/media/symbols.def.in
View File

@ -9,6 +9,7 @@ nestegg_destroy
nestegg_duration
nestegg_free_packet
nestegg_init
nestegg_offset_seek
nestegg_packet_count
nestegg_packet_data
nestegg_packet_track

2
media/libnestegg/README_MOZILLA
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@ -5,4 +5,4 @@ Makefile.in build files for the Mozilla build system.
The nestegg git repository is: git://github.com/kinetiknz/nestegg.git
The git commit ID used was a4dd140a8c1073d8d5ef7848f83730e12bdfcf18.
The git commit ID used was ce207d5b7566da2900e728b776a918ff3ab3dbb0.

9
media/libnestegg/include/nestegg.h
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@ -194,6 +194,15 @@ int nestegg_get_cue_point(nestegg * context, unsigned int cluster_num,
int64_t max_offset, int64_t * start_pos,
int64_t * end_pos);
/** Seek to @a offset. Stream will seek directly to offset.
Should be used to seek to the start of a resync point, i.e. cluster; the
parser will not be able to understand other offsets.
@param context Stream context initialized by #nestegg_init.
@param offset Absolute offset in bytes.
@retval 0 Success.
@retval -1 Error. */
int nestegg_offset_seek(nestegg * context, uint64_t offset);
/** Seek @a track to @a tstamp. Stream seek will terminate at the earliest
key point in the stream at or before @a tstamp. Other tracks in the
stream will output packets with unspecified but nearby timestamps.

33
media/libnestegg/src/nestegg.c
View File

@ -1647,6 +1647,27 @@ nestegg_get_cue_point(nestegg * ctx, unsigned int cluster_num, int64_t max_offse
return 0;
}
int
nestegg_offset_seek(nestegg * ctx, uint64_t offset)
{
int r;
/* Seek and set up parser state for segment-level element (Cluster). */
r = ne_io_seek(ctx->io, offset, NESTEGG_SEEK_SET);
if (r != 0)
return -1;
ctx->last_id = 0;
ctx->last_size = 0;
while (ctx->ancestor)
ne_ctx_pop(ctx);
ne_ctx_push(ctx, ne_top_level_elements, ctx);
ne_ctx_push(ctx, ne_segment_elements, &ctx->segment);
return 0;
}
int
nestegg_track_seek(nestegg * ctx, unsigned int track, uint64_t tstamp)
{
@ -1691,17 +1712,7 @@ nestegg_track_seek(nestegg * ctx, unsigned int track, uint64_t tstamp)
}
/* Seek and set up parser state for segment-level element (Cluster). */
r = ne_io_seek(ctx->io, ctx->segment_offset + seek_pos, NESTEGG_SEEK_SET);
if (r != 0)
return -1;
ctx->last_id = 0;
ctx->last_size = 0;
while (ctx->ancestor)
ne_ctx_pop(ctx);
ne_ctx_push(ctx, ne_top_level_elements, ctx);
ne_ctx_push(ctx, ne_segment_elements, &ctx->segment);
r = nestegg_offset_seek(ctx, ctx->segment_offset + seek_pos);
ctx->log(ctx, NESTEGG_LOG_DEBUG, "seek: parsing cluster elements");
r = ne_parse(ctx, NULL, -1);
if (r != 1)