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oggenc: add pagesize option to set preferred page size

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When set, if an Ogg stream buffer has enough data, a page is made
instead of filling maximum-size pages. Using smaller pages results
smaller seek intervals at the expense of higher container overhead.

Signed-off-by: Justin Ruggles <justin.ruggles@gmail.com>
This commit is contained in:
Andres Gonzalez 2011-01-27 10:14:21 +01:00 committed by Justin Ruggles
parent 67aec401d8
commit ed3e1b485a
1 changed files with 25 additions and 2 deletions
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27
libavformat/oggenc.c
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@ -21,6 +21,7 @@
#include "libavutil/crc.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "libavcodec/xiph.h"
#include "libavcodec/bytestream.h"
@ -63,9 +64,28 @@ typedef struct OGGPageList {
} OGGPageList;
typedef struct {
const AVClass *class;
OGGPageList *page_list;
int pref_size; ///< preferred page size (0 => fill all segments)
} OGGContext;
#define OFFSET(x) offsetof(OGGContext, x)
#define PARAM AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "pagesize", "preferred page size in bytes",
OFFSET(pref_size), AV_OPT_TYPE_INT, { 0 }, 0, MAX_PAGE_SIZE, PARAM },
{ NULL },
};
static const AVClass ogg_muxer_class = {
.class_name = "Ogg muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
{
int64_t pos = avio_tell(pb);
@ -175,6 +195,7 @@ static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
uint8_t *data, unsigned size, int64_t granule)
{
OGGStreamContext *oggstream = st->priv_data;
OGGContext *ogg = s->priv_data;
int total_segments = size / 255 + 1;
uint8_t *p = data;
int i, segments, len, flush = 0;
@ -210,8 +231,9 @@ static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
if (i == total_segments)
page->granule = granule;
if (page->segments_count == 255) {
ogg_buffer_page(s, oggstream);
if (page->segments_count == 255 ||
(ogg->pref_size > 0 && page->size >= ogg->pref_size)) {
ogg_buffer_page(s, oggstream);
}
}
@ -515,4 +537,5 @@ AVOutputFormat ff_ogg_muxer = {
.write_header = ogg_write_header,
.write_packet = ogg_write_packet,
.write_trailer = ogg_write_trailer,
.priv_class = &ogg_muxer_class,
};