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qtdemux: Extract AV1 codec_data and put it in the caps

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Also extract the presentation-delay and put it in the caps.
This commit is contained in:
Olivier Crête 2018-07-25 14:31:39 -04:00
parent b6e8c6323e
commit 43ee4055c3
2 changed files with 76 additions and 0 deletions
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1
gst/isomp4/fourcc.h
View file

@ -265,6 +265,7 @@ G_BEGIN_DECLS
#define FOURCC_zlib GST_MAKE_FOURCC('z','l','i','b')
#define FOURCC_lpcm GST_MAKE_FOURCC('l','p','c','m')
#define FOURCC_av01 GST_MAKE_FOURCC('a','v','0','1')
#define FOURCC_av1C GST_MAKE_FOURCC('a','v','1','C')
#define FOURCC_cfhd GST_MAKE_FOURCC('C','F','H','D')
#define FOURCC_ap4x GST_MAKE_FOURCC('a','p','4','x')

75
gst/isomp4/qtdemux.c
View file

@ -11187,6 +11187,81 @@ qtdemux_parse_trak (GstQTDemux * qtdemux, GNode * trak)
}
break;
}
case FOURCC_av01:
{
gint len = QT_UINT32 (stsd_entry_data) - 0x56;
const guint8 *av1_data = stsd_entry_data + 0x56;
/* find av1C */
while (len >= 0x8) {
gint size;
if (QT_UINT32 (av1_data) <= len)
size = QT_UINT32 (av1_data) - 0x8;
else
size = len - 0x8;
if (size < 1)
/* No real data, so break out */
break;
switch (QT_FOURCC (av1_data + 0x4)) {
case FOURCC_av1C:
{
/* parse, if found */
GstBuffer *buf;
guint8 pres_delay_field;
GST_DEBUG_OBJECT (qtdemux,
"found av1C codec_data in stsd of size %d", size);
/* not enough data, just ignore and hope for the best */
if (size < 5)
break;
/* Content is:
* 4 bytes: atom length
* 4 bytes: fourcc
* 1 byte: version
* 3 bytes: flags
* 3 bits: reserved
* 1 bits: initial_presentation_delay_present
* 4 bits: initial_presentation_delay (if present else reserved
* rest: OBUs.
*/
if (av1_data[9] != 0) {
GST_WARNING ("Unknown version %d of av1C box", av1_data[9]);
break;
}
/* We skip initial_presentation_delay* for now */
pres_delay_field = *(av1_data + 12);
if (pres_delay_field & (1 << 5)) {
gst_caps_set_simple (entry->caps,
"presentation-delay", G_TYPE_INT,
(gint) (pres_delay_field & 0x0F) + 1, NULL);
}
if (size > 5) {
buf = gst_buffer_new_and_alloc (size - 5);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_HEADER);
gst_buffer_fill (buf, 0, av1_data + 13, size - 5);
gst_caps_set_simple (entry->caps,
"codec_data", GST_TYPE_BUFFER, buf, NULL);
gst_buffer_unref (buf);
}
break;
}
default:
break;
}
len -= size + 8;
av1_data += size + 8;
}
break;
}
default:
break;
}