diff mbox series

[FFmpeg-devel,1/2] avformat/mov: Rework the AVIF parser to handle multiple items

Message ID 20220630210434.1551769-1-vigneshv@google.com
State New
Headers show
Series [FFmpeg-devel,1/2] avformat/mov: Rework the AVIF parser to handle multiple items | expand

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yinshiyou/make_loongarch64 success Make finished
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Commit Message

Vignesh Venkatasubramanian June 30, 2022, 9:04 p.m. UTC
Stores the item ids of all the items found in the file and
processes the primary item at the end of the meta box. This patch
does not change any behavior. It sets up the code for parsing
alpha channel (and possibly images with 'grid') in follow up
patches.

Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
---
 libavformat/isom.h |   4 ++
 libavformat/mov.c  | 148 ++++++++++++++++++++++++++++-----------------
 2 files changed, 97 insertions(+), 55 deletions(-)

Comments

James Zern July 11, 2022, 10:25 p.m. UTC | #1
On Thu, Jun 30, 2022 at 2:04 PM Vignesh Venkatasubramanian
<vigneshv-at-google.com@ffmpeg.org> wrote:
>
> Stores the item ids of all the items found in the file and
> processes the primary item at the end of the meta box. This patch
> does not change any behavior. It sets up the code for parsing
> alpha channel (and possibly images with 'grid') in follow up
> patches.
>
> Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
> ---
>  libavformat/isom.h |   4 ++
>  libavformat/mov.c  | 148 ++++++++++++++++++++++++++++-----------------
>  2 files changed, 97 insertions(+), 55 deletions(-)
>
> [...]

@@ -4692,9 +4755,25 @@ static int mov_read_meta(MOVContext *c,
AVIOContext *pb, MOVAtom atom)
         tag = avio_rl32(pb);
         atom.size -= 4;
         if (tag == MKTAG('h','d','l','r')) {
+            int ret;
             avio_seek(pb, -8, SEEK_CUR);
             atom.size += 8;
-            return mov_read_default(c, pb, atom);
+            ret = mov_read_default(c, pb, atom);
+            if (ret < 0)

In some other cases these two lines are combined, if ((ret = ...

+                return ret;
+            if (c->is_still_picture_avif) {
+                int ret;
+                // Add a stream for the YUV planes (primary item).
+                ret = avif_add_stream(c, c->primary_item_id);
+                if (ret)

This could be updated too and use '< 0' to match other code.

+                    return ret;
+                // For still AVIF images, the meta box contains all the
+                // necessary information that would generally be
provided by the
+                // moov box. So simply mark that we have found the moov box so
+                // that parsing can continue.
+                c->found_moov = 1;
+            }
+            return ret;
         }
Vignesh Venkatasubramanian July 13, 2022, 4:12 p.m. UTC | #2
On Mon, Jul 11, 2022 at 3:25 PM James Zern
<jzern-at-google.com@ffmpeg.org> wrote:
>
> On Thu, Jun 30, 2022 at 2:04 PM Vignesh Venkatasubramanian
> <vigneshv-at-google.com@ffmpeg.org> wrote:
> >
> > Stores the item ids of all the items found in the file and
> > processes the primary item at the end of the meta box. This patch
> > does not change any behavior. It sets up the code for parsing
> > alpha channel (and possibly images with 'grid') in follow up
> > patches.
> >
> > Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
> > ---
> >  libavformat/isom.h |   4 ++
> >  libavformat/mov.c  | 148 ++++++++++++++++++++++++++++-----------------
> >  2 files changed, 97 insertions(+), 55 deletions(-)
> >
> > [...]
>
> @@ -4692,9 +4755,25 @@ static int mov_read_meta(MOVContext *c,
> AVIOContext *pb, MOVAtom atom)
>          tag = avio_rl32(pb);
>          atom.size -= 4;
>          if (tag == MKTAG('h','d','l','r')) {
> +            int ret;
>              avio_seek(pb, -8, SEEK_CUR);
>              atom.size += 8;
> -            return mov_read_default(c, pb, atom);
> +            ret = mov_read_default(c, pb, atom);
> +            if (ret < 0)
>
> In some other cases these two lines are combined, if ((ret = ...
>

Done.

> +                return ret;
> +            if (c->is_still_picture_avif) {
> +                int ret;
> +                // Add a stream for the YUV planes (primary item).
> +                ret = avif_add_stream(c, c->primary_item_id);
> +                if (ret)
>
> This could be updated too and use '< 0' to match other code.
>

Done.

> +                    return ret;
> +                // For still AVIF images, the meta box contains all the
> +                // necessary information that would generally be
> provided by the
> +                // moov box. So simply mark that we have found the moov box so
> +                // that parsing can continue.
> +                c->found_moov = 1;
> +            }
> +            return ret;
>          }
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
Vignesh Venkatasubramanian July 22, 2022, 6:20 p.m. UTC | #3
On Wed, Jul 13, 2022 at 9:12 AM Vignesh Venkatasubramanian
<vigneshv@google.com> wrote:
>
> On Mon, Jul 11, 2022 at 3:25 PM James Zern
> <jzern-at-google.com@ffmpeg.org> wrote:
> >
> > On Thu, Jun 30, 2022 at 2:04 PM Vignesh Venkatasubramanian
> > <vigneshv-at-google.com@ffmpeg.org> wrote:
> > >
> > > Stores the item ids of all the items found in the file and
> > > processes the primary item at the end of the meta box. This patch
> > > does not change any behavior. It sets up the code for parsing
> > > alpha channel (and possibly images with 'grid') in follow up
> > > patches.
> > >
> > > Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
> > > ---
> > >  libavformat/isom.h |   4 ++
> > >  libavformat/mov.c  | 148 ++++++++++++++++++++++++++++-----------------
> > >  2 files changed, 97 insertions(+), 55 deletions(-)
> > >
> > > [...]
> >
> > @@ -4692,9 +4755,25 @@ static int mov_read_meta(MOVContext *c,
> > AVIOContext *pb, MOVAtom atom)
> >          tag = avio_rl32(pb);
> >          atom.size -= 4;
> >          if (tag == MKTAG('h','d','l','r')) {
> > +            int ret;
> >              avio_seek(pb, -8, SEEK_CUR);
> >              atom.size += 8;
> > -            return mov_read_default(c, pb, atom);
> > +            ret = mov_read_default(c, pb, atom);
> > +            if (ret < 0)
> >
> > In some other cases these two lines are combined, if ((ret = ...
> >
>
> Done.
>
> > +                return ret;
> > +            if (c->is_still_picture_avif) {
> > +                int ret;
> > +                // Add a stream for the YUV planes (primary item).
> > +                ret = avif_add_stream(c, c->primary_item_id);
> > +                if (ret)
> >
> > This could be updated too and use '< 0' to match other code.
> >
>
> Done.
>
> > +                    return ret;
> > +                // For still AVIF images, the meta box contains all the
> > +                // necessary information that would generally be
> > provided by the
> > +                // moov box. So simply mark that we have found the moov box so
> > +                // that parsing can continue.
> > +                c->found_moov = 1;
> > +            }
> > +            return ret;
> >          }
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel@ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
>
>
> --
> Vignesh

Any further comments on this one?

Please note that i have abandoned the second patch in this list. But
this one is still up for merging.
James Zern July 26, 2022, 7:02 p.m. UTC | #4
On Fri, Jul 22, 2022 at 11:21 AM Vignesh Venkatasubramanian
<vigneshv-at-google.com@ffmpeg.org> wrote:
>
> On Wed, Jul 13, 2022 at 9:12 AM Vignesh Venkatasubramanian
> <vigneshv@google.com> wrote:
> >
> > On Mon, Jul 11, 2022 at 3:25 PM James Zern
> > <jzern-at-google.com@ffmpeg.org> wrote:
> > >
> > > On Thu, Jun 30, 2022 at 2:04 PM Vignesh Venkatasubramanian
> > > <vigneshv-at-google.com@ffmpeg.org> wrote:
> > > >
> > > > Stores the item ids of all the items found in the file and
> > > > processes the primary item at the end of the meta box. This patch
> > > > does not change any behavior. It sets up the code for parsing
> > > > alpha channel (and possibly images with 'grid') in follow up
> > > > patches.
> > > >
> > > > Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
> > > > ---
> > > >  libavformat/isom.h |   4 ++
> > > >  libavformat/mov.c  | 148 ++++++++++++++++++++++++++++-----------------
> > > >  2 files changed, 97 insertions(+), 55 deletions(-)
> > > >
> > > > [...]
> > >
> > > @@ -4692,9 +4755,25 @@ static int mov_read_meta(MOVContext *c,
> > > AVIOContext *pb, MOVAtom atom)
> > >          tag = avio_rl32(pb);
> > >          atom.size -= 4;
> > >          if (tag == MKTAG('h','d','l','r')) {
> > > +            int ret;
> > >              avio_seek(pb, -8, SEEK_CUR);
> > >              atom.size += 8;
> > > -            return mov_read_default(c, pb, atom);
> > > +            ret = mov_read_default(c, pb, atom);
> > > +            if (ret < 0)
> > >
> > > In some other cases these two lines are combined, if ((ret = ...
> > >
> >
> > Done.
> >
> > > +                return ret;
> > > +            if (c->is_still_picture_avif) {
> > > +                int ret;
> > > +                // Add a stream for the YUV planes (primary item).
> > > +                ret = avif_add_stream(c, c->primary_item_id);
> > > +                if (ret)
> > >
> > > This could be updated too and use '< 0' to match other code.
> > >
> >
> > Done.
> >
> > > +                    return ret;
> > > +                // For still AVIF images, the meta box contains all the
> > > +                // necessary information that would generally be
> > > provided by the
> > > +                // moov box. So simply mark that we have found the moov box so
> > > +                // that parsing can continue.
> > > +                c->found_moov = 1;
> > > +            }
> > > +            return ret;
> > >          }
> > > _______________________________________________
> > > ffmpeg-devel mailing list
> > > ffmpeg-devel@ffmpeg.org
> > > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> > >
> > > To unsubscribe, visit link above, or email
> > > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> >
> >
> >
> > --
> > Vignesh
>
> Any further comments on this one?
>
> Please note that i have abandoned the second patch in this list. But
> this one is still up for merging.
>

This looks like it needs to be rebased. I'll take a look after that.
Vignesh Venkatasubramanian July 27, 2022, 4:12 p.m. UTC | #5
On Tue, Jul 26, 2022 at 12:02 PM James Zern
<jzern-at-google.com@ffmpeg.org> wrote:
>
> On Fri, Jul 22, 2022 at 11:21 AM Vignesh Venkatasubramanian
> <vigneshv-at-google.com@ffmpeg.org> wrote:
> >
> > On Wed, Jul 13, 2022 at 9:12 AM Vignesh Venkatasubramanian
> > <vigneshv@google.com> wrote:
> > >
> > > On Mon, Jul 11, 2022 at 3:25 PM James Zern
> > > <jzern-at-google.com@ffmpeg.org> wrote:
> > > >
> > > > On Thu, Jun 30, 2022 at 2:04 PM Vignesh Venkatasubramanian
> > > > <vigneshv-at-google.com@ffmpeg.org> wrote:
> > > > >
> > > > > Stores the item ids of all the items found in the file and
> > > > > processes the primary item at the end of the meta box. This patch
> > > > > does not change any behavior. It sets up the code for parsing
> > > > > alpha channel (and possibly images with 'grid') in follow up
> > > > > patches.
> > > > >
> > > > > Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com>
> > > > > ---
> > > > >  libavformat/isom.h |   4 ++
> > > > >  libavformat/mov.c  | 148 ++++++++++++++++++++++++++++-----------------
> > > > >  2 files changed, 97 insertions(+), 55 deletions(-)
> > > > >
> > > > > [...]
> > > >
> > > > @@ -4692,9 +4755,25 @@ static int mov_read_meta(MOVContext *c,
> > > > AVIOContext *pb, MOVAtom atom)
> > > >          tag = avio_rl32(pb);
> > > >          atom.size -= 4;
> > > >          if (tag == MKTAG('h','d','l','r')) {
> > > > +            int ret;
> > > >              avio_seek(pb, -8, SEEK_CUR);
> > > >              atom.size += 8;
> > > > -            return mov_read_default(c, pb, atom);
> > > > +            ret = mov_read_default(c, pb, atom);
> > > > +            if (ret < 0)
> > > >
> > > > In some other cases these two lines are combined, if ((ret = ...
> > > >
> > >
> > > Done.
> > >
> > > > +                return ret;
> > > > +            if (c->is_still_picture_avif) {
> > > > +                int ret;
> > > > +                // Add a stream for the YUV planes (primary item).
> > > > +                ret = avif_add_stream(c, c->primary_item_id);
> > > > +                if (ret)
> > > >
> > > > This could be updated too and use '< 0' to match other code.
> > > >
> > >
> > > Done.
> > >
> > > > +                    return ret;
> > > > +                // For still AVIF images, the meta box contains all the
> > > > +                // necessary information that would generally be
> > > > provided by the
> > > > +                // moov box. So simply mark that we have found the moov box so
> > > > +                // that parsing can continue.
> > > > +                c->found_moov = 1;
> > > > +            }
> > > > +            return ret;
> > > >          }
> > > > _______________________________________________
> > > > ffmpeg-devel mailing list
> > > > ffmpeg-devel@ffmpeg.org
> > > > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> > > >
> > > > To unsubscribe, visit link above, or email
> > > > ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
> > >
> > >
> > >
> > > --
> > > Vignesh
> >
> > Any further comments on this one?
> >
> > Please note that i have abandoned the second patch in this list. But
> > this one is still up for merging.
> >
>
> This looks like it needs to be rebased. I'll take a look after that.

Done.

> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
diff mbox series

Patch

diff --git a/libavformat/isom.h b/libavformat/isom.h
index f05c2d9c28..d8b262e915 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -318,6 +318,10 @@  typedef struct MOVContext {
     uint32_t max_stts_delta;
     int is_still_picture_avif;
     int primary_item_id;
+    int *avif_item_ids;
+    int avif_item_ids_size;
+    int *avif_extent_lengths;
+    int64_t *avif_extent_offsets;
 } MOVContext;
 
 int ff_mp4_read_descr_len(AVIOContext *pb);
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 88669faa70..9df5055d4e 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -4683,6 +4683,69 @@  static int mov_read_custom(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     return ret;
 }
 
+static int avif_add_stream(MOVContext *c, int item_id)
+{
+    MOVStreamContext *sc;
+    AVStream *st;
+    int item_index = -1;
+    for (int i = 0; i < c->avif_item_ids_size; i++)
+        if (c->avif_item_ids[i] == item_id) {
+            item_index = i;
+            break;
+        }
+    if (item_index < 0)
+        return AVERROR_INVALIDDATA;
+    st = avformat_new_stream(c->fc, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    st->id = c->fc->nb_streams;
+    sc = av_mallocz(sizeof(MOVStreamContext));
+    if (!sc)
+        return AVERROR(ENOMEM);
+
+    st->priv_data = sc;
+    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+    st->codecpar->codec_id = AV_CODEC_ID_AV1;
+    sc->ffindex = st->index;
+    c->trak_index = st->index;
+    st->avg_frame_rate.num = st->avg_frame_rate.den = 1;
+    st->time_base.num = st->time_base.den = 1;
+    st->nb_frames = 1;
+    sc->time_scale = 1;
+    sc = st->priv_data;
+    sc->pb = c->fc->pb;
+    sc->pb_is_copied = 1;
+
+    // Populate the necessary fields used by mov_build_index.
+    sc->stsc_count = 1;
+    sc->stsc_data = av_malloc_array(1, sizeof(*sc->stsc_data));
+    if (!sc->stsc_data)
+        return AVERROR(ENOMEM);
+    sc->stsc_data[0].first = 1;
+    sc->stsc_data[0].count = 1;
+    sc->stsc_data[0].id = 1;
+    sc->chunk_count = 1;
+    sc->chunk_offsets = av_malloc_array(1, sizeof(*sc->chunk_offsets));
+    if (!sc->chunk_offsets)
+        return AVERROR(ENOMEM);
+    sc->sample_count = 1;
+    sc->sample_sizes = av_malloc_array(1, sizeof(*sc->sample_sizes));
+    if (!sc->sample_sizes)
+        return AVERROR(ENOMEM);
+    sc->stts_count = 1;
+    sc->stts_data = av_malloc_array(1, sizeof(*sc->stts_data));
+    if (!sc->stts_data)
+        return AVERROR(ENOMEM);
+    sc->stts_data[0].count = 1;
+    // Not used for still images. But needed by mov_build_index.
+    sc->stts_data[0].duration = 0;
+    sc->sample_sizes[0] = c->avif_extent_lengths[item_index];
+    sc->chunk_offsets[0] = c->avif_extent_offsets[item_index];
+
+    mov_build_index(c, st);
+    return 0;
+}
+
 static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 {
     while (atom.size > 8) {
@@ -4692,9 +4755,25 @@  static int mov_read_meta(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         tag = avio_rl32(pb);
         atom.size -= 4;
         if (tag == MKTAG('h','d','l','r')) {
+            int ret;
             avio_seek(pb, -8, SEEK_CUR);
             atom.size += 8;
-            return mov_read_default(c, pb, atom);
+            ret = mov_read_default(c, pb, atom);
+            if (ret < 0)
+                return ret;
+            if (c->is_still_picture_avif) {
+                int ret;
+                // Add a stream for the YUV planes (primary item).
+                ret = avif_add_stream(c, c->primary_item_id);
+                if (ret)
+                    return ret;
+                // For still AVIF images, the meta box contains all the
+                // necessary information that would generally be provided by the
+                // moov box. So simply mark that we have found the moov box so
+                // that parsing can continue.
+                c->found_moov = 1;
+            }
+            return ret;
         }
     }
     return 0;
@@ -7483,8 +7562,6 @@  static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     int item_count, extent_count;
     uint64_t base_offset, extent_offset, extent_length;
     uint8_t value;
-    AVStream *st;
-    MOVStreamContext *sc;
 
     if (!c->is_still_picture_avif) {
         // * For non-avif, we simply ignore the iloc box.
@@ -7498,27 +7575,6 @@  static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
         return 0;
     }
 
-    st = avformat_new_stream(c->fc, NULL);
-    if (!st)
-        return AVERROR(ENOMEM);
-    st->id = c->fc->nb_streams;
-    sc = av_mallocz(sizeof(MOVStreamContext));
-    if (!sc)
-        return AVERROR(ENOMEM);
-
-    st->priv_data = sc;
-    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
-    st->codecpar->codec_id = AV_CODEC_ID_AV1;
-    sc->ffindex = st->index;
-    c->trak_index = st->index;
-    st->avg_frame_rate.num = st->avg_frame_rate.den = 1;
-    st->time_base.num = st->time_base.den = 1;
-    st->nb_frames = 1;
-    sc->time_scale = 1;
-    sc = st->priv_data;
-    sc->pb = c->fc->pb;
-    sc->pb_is_copied = 1;
-
     version = avio_r8(pb);
     avio_rb24(pb);  // flags.
 
@@ -7534,32 +7590,20 @@  static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     }
     item_count = (version < 2) ? avio_rb16(pb) : avio_rb32(pb);
 
-    // Populate the necessary fields used by mov_build_index.
-    sc->stsc_count = 1;
-    sc->stsc_data = av_malloc_array(1, sizeof(*sc->stsc_data));
-    if (!sc->stsc_data)
+    c->avif_item_ids = av_malloc_array(item_count, sizeof(*c->avif_item_ids));
+    if (!c->avif_item_ids)
         return AVERROR(ENOMEM);
-    sc->stsc_data[0].first = 1;
-    sc->stsc_data[0].count = 1;
-    sc->stsc_data[0].id = 1;
-    sc->chunk_count = 1;
-    sc->chunk_offsets = av_malloc_array(1, sizeof(*sc->chunk_offsets));
-    if (!sc->chunk_offsets)
+    c->avif_item_ids_size = item_count;
+    c->avif_extent_lengths = av_malloc_array(item_count, sizeof(*c->avif_extent_lengths));
+    if (!c->avif_extent_lengths)
         return AVERROR(ENOMEM);
-    sc->sample_count = 1;
-    sc->sample_sizes = av_malloc_array(1, sizeof(*sc->sample_sizes));
-    if (!sc->sample_sizes)
+    c->avif_extent_offsets = av_malloc_array(item_count, sizeof(*c->avif_extent_offsets));
+    if (!c->avif_extent_offsets)
         return AVERROR(ENOMEM);
-    sc->stts_count = 1;
-    sc->stts_data = av_malloc_array(1, sizeof(*sc->stts_data));
-    if (!sc->stts_data)
-        return AVERROR(ENOMEM);
-    sc->stts_data[0].count = 1;
-    // Not used for still images. But needed by mov_build_index.
-    sc->stts_data[0].duration = 0;
 
     for (int i = 0; i < item_count; i++) {
         int item_id = (version < 2) ? avio_rb16(pb) : avio_rb32(pb);
+        c->avif_item_ids[i] = item_id;
         if (version > 0)
             avio_rb16(pb);  // construction_method.
         avio_rb16(pb);  // data_reference_index.
@@ -7575,20 +7619,11 @@  static int mov_read_iloc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
             if (rb_size(pb, &extent_offset, offset_size) < 0 ||
                 rb_size(pb, &extent_length, length_size) < 0)
                 return AVERROR_INVALIDDATA;
-            if (item_id == c->primary_item_id) {
-                sc->sample_sizes[0] = extent_length;
-                sc->chunk_offsets[0] = base_offset + extent_offset;
-            }
+            c->avif_extent_lengths[i] = extent_length;
+            c->avif_extent_offsets[i] = base_offset + extent_offset;
         }
     }
 
-    mov_build_index(c, st);
-
-    // For still AVIF images, the iloc box contains all the necessary
-    // information that would generally be provided by the moov box. So simply
-    // mark that we have found the moov box so that parsing can continue.
-    c->found_moov = 1;
-
     return atom.size;
 }
 
@@ -8192,6 +8227,9 @@  static int mov_read_close(AVFormatContext *s)
 
     av_freep(&mov->aes_decrypt);
     av_freep(&mov->chapter_tracks);
+    av_freep(&mov->avif_item_ids);
+    av_freep(&mov->avif_extent_lengths);
+    av_freep(&mov->avif_extent_offsets);
 
     return 0;
 }