[FFmpeg-devel] [PATCH 4/5] avformat/mov: Refactor DOVI box parsing to use ff_mov_parse_dvcc_dvvc

[quietvoid]

Read at most 24 bytes, but in reality only 5 bytes are used for parsing.
The rest of the bytes are reserved in the specification.

Signed-off-by: quietvoid <tcChlisop0 at gmail.com>
---
 libavformat/mov.c | 48 +++++++++--------------------------------------
 1 file changed, 9 insertions(+), 39 deletions(-)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index ca14646a38..d3c483a2f1 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -6797,10 +6797,10 @@ static int mov_read_dmlp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 static int mov_read_dvcc_dvvc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
 {
     AVStream *st;
-    uint32_t buf;
-    AVDOVIDecoderConfigurationRecord *dovi;
-    size_t dovi_size;
+    uint8_t buf[MOV_DVCC_DVVC_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
+    GetBitContext gb;
     int ret;
+    int64_t read_size = atom.size;
 
     if (c->fc->nb_streams < 1)
         return 0;
@@ -6809,46 +6809,16 @@ static int mov_read_dvcc_dvvc(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     if ((uint64_t)atom.size > (1<<30) || atom.size < 4)
         return AVERROR_INVALIDDATA;
 
-    dovi = av_dovi_alloc(&dovi_size);
-    if (!dovi)
-        return AVERROR(ENOMEM);
-
-    dovi->dv_version_major = avio_r8(pb);
-    dovi->dv_version_minor = avio_r8(pb);
-
-    buf = avio_rb16(pb);
-    dovi->dv_profile        = (buf >> 9) & 0x7f;    // 7 bits
-    dovi->dv_level          = (buf >> 3) & 0x3f;    // 6 bits
-    dovi->rpu_present_flag  = (buf >> 2) & 0x01;    // 1 bit
-    dovi->el_present_flag   = (buf >> 1) & 0x01;    // 1 bit
-    dovi->bl_present_flag   =  buf       & 0x01;    // 1 bit
-    if (atom.size >= 24) {  // 4 + 4 + 4 * 4
-        buf = avio_r8(pb);
-        dovi->dv_bl_signal_compatibility_id = (buf >> 4) & 0x0f; // 4 bits
-    } else {
-        // 0 stands for None
-        // Dolby Vision V1.2.93 profiles and levels
-        dovi->dv_bl_signal_compatibility_id = 0;
+    // At most 24 bytes
+    if (read_size > MOV_DVCC_DVVC_SIZE) {
+        read_size = MOV_DVCC_DVVC_SIZE;
     }
 
-    ret = av_stream_add_side_data(st, AV_PKT_DATA_DOVI_CONF,
-                                  (uint8_t *)dovi, dovi_size);
-    if (ret < 0) {
-        av_free(dovi);
+    if ((ret = ffio_read_size(pb, buf, read_size)) < 0)
         return ret;
-    }
 
-    av_log(c, AV_LOG_TRACE, "DOVI in dvcC/dvvC box, version: %d.%d, profile: %d, level: %d, "
-           "rpu flag: %d, el flag: %d, bl flag: %d, compatibility id: %d\n",
-           dovi->dv_version_major, dovi->dv_version_minor,
-           dovi->dv_profile, dovi->dv_level,
-           dovi->rpu_present_flag,
-           dovi->el_present_flag,
-           dovi->bl_present_flag,
-           dovi->dv_bl_signal_compatibility_id
-        );
-
-    return 0;
+    init_get_bits8(&gb, buf, read_size);
+    return ff_mov_parse_dvcc_dvvc(c->fc, st, &gb);
 }
 
 static const MOVParseTableEntry mov_default_parse_table[] = {
-- 
2.33.0