[FFmpeg-devel] [PATCH 2/4] avformat/mov: add support for auxC box

[James Almer]

It's used to signal an item is an auxiliary image.

Signed-off-by: James Almer <jamr...@gmail.com>
---
 libavformat/isom.h |  1 +
 libavformat/mov.c  | 47 +++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 47 insertions(+), 1 deletion(-)

diff --git a/libavformat/isom.h b/libavformat/isom.h
index 4723397048..5076bc5da7 100644
--- a/libavformat/isom.h
+++ b/libavformat/isom.h
@@ -285,6 +285,7 @@ typedef struct HEIFItem {
     int height;
     int type;
     int is_idat_relative;
+    char *aux_type;
 } HEIFItem;
 
 typedef struct HEIFGrid {
diff --git a/libavformat/mov.c b/libavformat/mov.c
index a2333ac1fd..bd502d489a 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -8929,6 +8929,43 @@ static int mov_read_ispe(MOVContext *c, AVIOContext *pb, 
MOVAtom atom)
     return 0;
 }
 
+static int mov_read_auxc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+    AVBPrint bp;
+    int64_t size = atom.size;
+    char *aux_type;
+    int ret;
+
+    avio_r8(pb);  /* version */
+    avio_rb24(pb);  /* flags */
+    size -= 4;
+
+    av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
+    ret = ff_read_string_to_bprint_overwrite(pb, &bp, size);
+    if (ret < 0) {
+        av_bprint_finalize(&bp, NULL);
+        return ret;
+    }
+
+    size -= ret + 1;
+    if (size > 0)
+        avio_skip(pb, size);
+
+    if (ret)
+        av_bprint_finalize(&bp, &aux_type);
+
+    av_log(c->fc, AV_LOG_TRACE, "auxC: aux_type %s\n", aux_type);
+
+    for (int i = 0; i < c->nb_heif_item; i++) {
+        if (c->heif_item[i].item_id == c->cur_item_id) {
+            c->heif_item[i].aux_type = aux_type;
+            break;
+        }
+    }
+
+    return 0;
+}
+
 static int mov_read_iprp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 {
     typedef struct MOVAtoms {
@@ -9157,6 +9194,7 @@ static const MOVParseTableEntry mov_default_parse_table[] 
= {
 { MKTAG('i','s','p','e'), mov_read_ispe },
 { MKTAG('i','p','r','p'), mov_read_iprp },
 { MKTAG('i','i','n','f'), mov_read_iinf },
+{ MKTAG('a','u','x','C'), mov_read_auxc },
 { MKTAG('a','m','v','e'), mov_read_amve }, /* ambient viewing environment box 
*/
 { MKTAG('l','h','v','C'), mov_read_lhvc },
 { MKTAG('l','v','c','C'), mov_read_glbl },
@@ -9677,8 +9715,10 @@ static int mov_read_close(AVFormatContext *s)
 
     av_freep(&mov->aes_decrypt);
     av_freep(&mov->chapter_tracks);
-    for (i = 0; i < mov->nb_heif_item; i++)
+    for (i = 0; i < mov->nb_heif_item; i++) {
         av_freep(&mov->heif_item[i].name);
+        av_freep(&mov->heif_item[i].aux_type);
+    }
     av_freep(&mov->heif_item);
     for (i = 0; i < mov->nb_heif_grid; i++) {
         av_freep(&mov->heif_grid[i].tile_id_list);
@@ -10149,6 +10189,11 @@ static int mov_read_header(AVFormatContext *s)
             if (item->item_id == mov->primary_item_id)
                 st->disposition |= AV_DISPOSITION_DEFAULT;
 
+            if (item->aux_type &&
+                !memcmp(item->aux_type, 
"urn:com:apple:photo:2020:aux:hdrgainmap",
+                        strlen(item->aux_type)))
+                st->disposition |= (AV_DISPOSITION_GAINMAP | 
AV_DISPOSITION_DEPENDENT);
+
             mov_build_index(mov, st);
         }
 
-- 
2.46.0

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