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avformat/matroskaenc: Reduce usage of ebml_master 

After the last few commits, the functions for writing master elements
with CRC-32 elements didn't really make use of the ebml_master
structure any more, so remove these parameters from the functions.

The only things that still need to be kept are the positions of the
level 1 elements that are written preliminarily and updated later.
These positions are stored in the MatroskaMuxContext and
replace the corresponding ebml_master structures.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: James Almer <jamrial@gmail.com>
tags/n4.2
Andreas Rheinhardt James Almer 6 years ago
parent
9b932a855e
commit
48539b62fc
1 changed files with 49 additions and 54 deletions
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  1. +49
    -54
      libavformat/matroskaenc.c

+ 49
- 54
libavformat/matroskaenc.c View File

@@ -58,8 +58,7 @@
#include "libavcodec/internal.h"

typedef struct ebml_master {
int64_t pos; ///< absolute offset in the containing AVIOContext where the size field starts
///< for level 1 elements or else where the master's elements start
int64_t pos; ///< absolute offset in the containing AVIOContext where the master's elements start
int sizebytes; ///< how many bytes were reserved for the size
} ebml_master;

@@ -122,15 +121,14 @@ typedef struct MatroskaMuxContext {
const AVClass *class;
int mode;
AVIOContext *tags_bc;
ebml_master tags;
int64_t tags_pos;
AVIOContext *info_bc;
ebml_master info;
int64_t info_pos;
AVIOContext *tracks_bc;
ebml_master tracks_master;
int64_t tracks_pos;
ebml_master segment;
int64_t segment_offset;
AVIOContext *cluster_bc;
ebml_master cluster;
int64_t cluster_pos; ///< file offset of the current cluster
int64_t cluster_pts;
int64_t duration_offset;
@@ -334,7 +332,7 @@ static void end_ebml_master(AVIOContext *pb, ebml_master master)
}

static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
ebml_master *master, uint32_t elementid)
uint32_t elementid)
{
int ret;

@@ -342,15 +340,13 @@ static int start_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, Matros
return ret;

put_ebml_id(pb, elementid);
*master = (ebml_master) { avio_tell(pb), 0 };
if (mkv->write_crc)
put_ebml_void(*dyn_cp, 6); /* Reserve space for CRC32 so position/size calculations using avio_tell() take it into account */

return 0;
}

static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
ebml_master master)
static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv)
{
uint8_t *buf, crc[4];
int size, skip = 0;
@@ -372,11 +368,13 @@ static void end_ebml_master_crc32(AVIOContext *pb, AVIOContext **dyn_cp, Matrosk
* Complete ebml master without destroying the buffer, allowing for later updates
*/
static void end_ebml_master_crc32_preliminary(AVIOContext *pb, AVIOContext **dyn_cp, MatroskaMuxContext *mkv,
ebml_master master)
int64_t *pos)
{
uint8_t *buf;
int size = avio_get_dyn_buf(*dyn_cp, &buf);

*pos = avio_tell(pb);

put_ebml_num(pb, size, 0);
avio_write(pb, buf, size);
}
@@ -489,7 +487,7 @@ static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
{
AVIOContext *dyn_cp;
mkv_seekhead *seekhead = mkv->seekhead;
ebml_master metaseek, seekentry;
ebml_master seekentry;
int64_t currentpos;
int i;

@@ -502,7 +500,7 @@ static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
}
}

if (start_ebml_master_crc32(pb, &dyn_cp, mkv, &metaseek, MATROSKA_ID_SEEKHEAD) < 0) {
if (start_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_SEEKHEAD) < 0) {
currentpos = -1;
goto fail;
}
@@ -519,7 +517,7 @@ static int64_t mkv_write_seekhead(AVIOContext *pb, MatroskaMuxContext *mkv)
put_ebml_uint(dyn_cp, MATROSKA_ID_SEEKPOSITION, entry->segmentpos);
end_ebml_master(dyn_cp, seekentry);
}
end_ebml_master_crc32(pb, &dyn_cp, mkv, metaseek);
end_ebml_master_crc32(pb, &dyn_cp, mkv);

if (seekhead->reserved_size > 0) {
uint64_t remaining = seekhead->filepos + seekhead->reserved_size - avio_tell(pb);
@@ -572,12 +570,11 @@ static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tra
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *dyn_cp, *pb = s->pb;
ebml_master cues_element;
int64_t currentpos;
int i, j, ret;

currentpos = avio_tell(pb);
ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &cues_element, MATROSKA_ID_CUES);
ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_CUES);
if (ret < 0)
return ret;

@@ -623,7 +620,7 @@ static int64_t mkv_write_cues(AVFormatContext *s, mkv_cues *cues, mkv_track *tra
i += j - 1;
end_ebml_master(dyn_cp, cuepoint);
}
end_ebml_master_crc32(pb, &dyn_cp, mkv, cues_element);
end_ebml_master_crc32(pb, &dyn_cp, mkv);

return currentpos;
}
@@ -1453,7 +1450,7 @@ static int mkv_write_tracks(AVFormatContext *s)
if (ret < 0)
return ret;

ret = start_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, &mkv->tracks_master, MATROSKA_ID_TRACKS);
ret = start_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, MATROSKA_ID_TRACKS);
if (ret < 0)
return ret;

@@ -1468,9 +1465,9 @@ static int mkv_write_tracks(AVFormatContext *s)
}

if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
end_ebml_master_crc32_preliminary(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
end_ebml_master_crc32_preliminary(pb, &mkv->tracks_bc, mkv, &mkv->tracks_pos);
else
end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv);

return 0;
}
@@ -1479,7 +1476,7 @@ static int mkv_write_chapters(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *dyn_cp, *pb = s->pb;
ebml_master chapters, editionentry;
ebml_master editionentry;
AVRational scale = {1, 1E9};
int i, ret;

@@ -1489,7 +1486,7 @@ static int mkv_write_chapters(AVFormatContext *s)
ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_CHAPTERS, avio_tell(pb));
if (ret < 0) return ret;

ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &chapters, MATROSKA_ID_CHAPTERS);
ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_CHAPTERS);
if (ret < 0) return ret;

editionentry = start_ebml_master(dyn_cp, MATROSKA_ID_EDITIONENTRY, 0);
@@ -1527,7 +1524,7 @@ static int mkv_write_chapters(AVFormatContext *s)
end_ebml_master(dyn_cp, chapteratom);
}
end_ebml_master(dyn_cp, editionentry);
end_ebml_master_crc32(pb, &dyn_cp, mkv, chapters);
end_ebml_master_crc32(pb, &dyn_cp, mkv);

mkv->wrote_chapters = 1;
return 0;
@@ -1568,19 +1565,18 @@ static int mkv_write_simpletag(AVIOContext *pb, AVDictionaryEntry *t)
}

static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
unsigned int uid, ebml_master *tags,
ebml_master* tag)
unsigned int uid, ebml_master *tag)
{
AVIOContext *pb;
MatroskaMuxContext *mkv = s->priv_data;
ebml_master targets;
int ret;

if (!tags->pos) {
if (!mkv->tags_bc) {
ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_TAGS, avio_tell(s->pb));
if (ret < 0) return ret;

start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, tags, MATROSKA_ID_TAGS);
start_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, MATROSKA_ID_TAGS);
}
pb = mkv->tags_bc;

@@ -1607,14 +1603,14 @@ static int mkv_check_tag_name(const char *name, uint32_t elementid)
}

static int mkv_write_tag(AVFormatContext *s, AVDictionary *m, uint32_t elementid,
unsigned int uid, ebml_master *tags)
unsigned int uid)
{
MatroskaMuxContext *mkv = s->priv_data;
ebml_master tag;
int ret;
AVDictionaryEntry *t = NULL;

ret = mkv_write_tag_targets(s, elementid, uid, tags, &tag);
ret = mkv_write_tag_targets(s, elementid, uid, &tag);
if (ret < 0)
return ret;

@@ -1649,7 +1645,7 @@ static int mkv_write_tags(AVFormatContext *s)
ff_metadata_conv_ctx(s, ff_mkv_metadata_conv, NULL);

if (mkv_check_tag(s->metadata, 0)) {
ret = mkv_write_tag(s, s->metadata, 0, 0, &mkv->tags);
ret = mkv_write_tag(s, s->metadata, 0, 0);
if (ret < 0) return ret;
}

@@ -1662,7 +1658,7 @@ static int mkv_write_tags(AVFormatContext *s)
if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID))
continue;

ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags);
ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1);
if (ret < 0) return ret;
}

@@ -1676,7 +1672,7 @@ static int mkv_write_tags(AVFormatContext *s)
if (st->codecpar->codec_type == AVMEDIA_TYPE_ATTACHMENT)
continue;

mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &mkv->tags, &tag_target);
mkv_write_tag_targets(s, MATROSKA_ID_TAGTARGETS_TRACKUID, i + 1, &tag_target);
pb = mkv->tags_bc;

tag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
@@ -1698,7 +1694,7 @@ static int mkv_write_tags(AVFormatContext *s)
if (!mkv_check_tag(ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID))
continue;

ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset, &mkv->tags);
ret = mkv_write_tag(s, ch->metadata, MATROSKA_ID_TAGTARGETS_CHAPTERUID, ch->id + mkv->chapter_id_offset);
if (ret < 0)
return ret;
}
@@ -1712,17 +1708,17 @@ static int mkv_write_tags(AVFormatContext *s)
if (!mkv_check_tag(st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID))
continue;

ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID, attachment->fileuid, &mkv->tags);
ret = mkv_write_tag(s, st->metadata, MATROSKA_ID_TAGTARGETS_ATTACHUID, attachment->fileuid);
if (ret < 0)
return ret;
}
}

if (mkv->tags.pos) {
if (mkv->tags_bc) {
if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
end_ebml_master_crc32_preliminary(s->pb, &mkv->tags_bc, mkv, mkv->tags);
end_ebml_master_crc32_preliminary(s->pb, &mkv->tags_bc, mkv, &mkv->tags_pos);
else
end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv, mkv->tags);
end_ebml_master_crc32(s->pb, &mkv->tags_bc, mkv);
}
return 0;
}
@@ -1731,7 +1727,6 @@ static int mkv_write_attachments(AVFormatContext *s)
{
MatroskaMuxContext *mkv = s->priv_data;
AVIOContext *dyn_cp, *pb = s->pb;
ebml_master attachments;
AVLFG c;
int i, ret;

@@ -1747,7 +1742,7 @@ static int mkv_write_attachments(AVFormatContext *s)
ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_ATTACHMENTS, avio_tell(pb));
if (ret < 0) return ret;

ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, &attachments, MATROSKA_ID_ATTACHMENTS);
ret = start_ebml_master_crc32(pb, &dyn_cp, mkv, MATROSKA_ID_ATTACHMENTS);
if (ret < 0) return ret;

for (i = 0; i < s->nb_streams; i++) {
@@ -1820,7 +1815,7 @@ static int mkv_write_attachments(AVFormatContext *s)
mkv->attachments->entries[mkv->attachments->num_entries].stream_idx = i;
mkv->attachments->entries[mkv->attachments->num_entries++].fileuid = fileuid;
}
end_ebml_master_crc32(pb, &dyn_cp, mkv, attachments);
end_ebml_master_crc32(pb, &dyn_cp, mkv);

return 0;
}
@@ -1906,7 +1901,7 @@ static int mkv_write_header(AVFormatContext *s)
ret = mkv_add_seekhead_entry(mkv->seekhead, MATROSKA_ID_INFO, avio_tell(pb));
if (ret < 0) goto fail;

ret = start_ebml_master_crc32(pb, &mkv->info_bc, mkv, &mkv->info, MATROSKA_ID_INFO);
ret = start_ebml_master_crc32(pb, &mkv->info_bc, mkv, MATROSKA_ID_INFO);
if (ret < 0)
return ret;
pb = mkv->info_bc;
@@ -1965,9 +1960,9 @@ static int mkv_write_header(AVFormatContext *s)
}
}
if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && !mkv->is_live)
end_ebml_master_crc32_preliminary(s->pb, &mkv->info_bc, mkv, mkv->info);
end_ebml_master_crc32_preliminary(s->pb, &mkv->info_bc, mkv, &mkv->info_pos);
else
end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv, mkv->info);
end_ebml_master_crc32(s->pb, &mkv->info_bc, mkv);
pb = s->pb;

// initialize stream_duration fields
@@ -2263,7 +2258,7 @@ static void mkv_start_new_cluster(AVFormatContext *s, AVPacket *pkt)
{
MatroskaMuxContext *mkv = s->priv_data;

end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, mkv->cluster);
end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv);
mkv->cluster_pos = -1;
av_log(s, AV_LOG_DEBUG,
"Starting new cluster at offset %" PRIu64 " bytes, "
@@ -2408,7 +2403,7 @@ static int mkv_write_packet_internal(AVFormatContext *s, AVPacket *pkt, int add_

if (mkv->cluster_pos == -1) {
mkv->cluster_pos = avio_tell(s->pb);
ret = start_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, &mkv->cluster, MATROSKA_ID_CLUSTER);
ret = start_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, MATROSKA_ID_CLUSTER);
if (ret < 0)
return ret;
put_ebml_uint(mkv->cluster_bc, MATROSKA_ID_CLUSTERTIMECODE, FFMAX(0, ts));
@@ -2544,7 +2539,7 @@ static int mkv_write_flush_packet(AVFormatContext *s, AVPacket *pkt)

if (!pkt) {
if (mkv->cluster_pos != -1) {
end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv, mkv->cluster);
end_ebml_master_crc32(s->pb, &mkv->cluster_bc, mkv);
mkv->cluster_pos = -1;
av_log(s, AV_LOG_DEBUG,
"Flushing cluster at offset %" PRIu64 " bytes\n",
@@ -2575,7 +2570,7 @@ static int mkv_write_trailer(AVFormatContext *s)
}

if (mkv->cluster_bc) {
end_ebml_master_crc32(pb, &mkv->cluster_bc, mkv, mkv->cluster);
end_ebml_master_crc32(pb, &mkv->cluster_bc, mkv);
}

ret = mkv_write_chapters(s);
@@ -2623,12 +2618,12 @@ static int mkv_write_trailer(AVFormatContext *s)
currentpos = avio_tell(pb);
avio_seek(mkv->info_bc, mkv->duration_offset, SEEK_SET);
put_ebml_float(mkv->info_bc, MATROSKA_ID_DURATION, mkv->duration);
avio_seek(pb, mkv->info.pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->info_bc, mkv, mkv->info);
avio_seek(pb, mkv->info_pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->info_bc, mkv);

// write tracks master
avio_seek(pb, mkv->tracks_master.pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv, mkv->tracks_master);
avio_seek(pb, mkv->tracks_pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->tracks_bc, mkv);

// update stream durations
if (!mkv->is_live && mkv->stream_durations) {
@@ -2655,9 +2650,9 @@ static int mkv_write_trailer(AVFormatContext *s)
}
avio_seek(mkv->tags_bc, curr, SEEK_SET);
}
if (mkv->tags.pos && !mkv->is_live) {
avio_seek(pb, mkv->tags.pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->tags_bc, mkv, mkv->tags);
if (mkv->tags_bc && !mkv->is_live) {
avio_seek(pb, mkv->tags_pos, SEEK_SET);
end_ebml_master_crc32(pb, &mkv->tags_bc, mkv);
}

avio_seek(pb, currentpos, SEEK_SET);


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