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qtdemux: Drop av1C version 0 parsing and implement version 1 parsing

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The av1C box is optional so dropping parsing does not break anything
fundamentally, and there seems to be no historical record how version 0
even looks like while the comments and the parsing disagreed with each
other.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3882>
This commit is contained in:
Sebastian Dröge 2023-02-02 16:28:47 +02:00 committed by GStreamer Marge Bot
parent 3d506a0978
commit 8593a58916
1 changed files with 52 additions and 25 deletions
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77
subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
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@ -12174,46 +12174,73 @@ qtdemux_parse_trak (GstQTDemux * qtdemux, GNode * trak)
{
/* 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)
if (size < 4)
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
*
* version 1 (marker=1):
*
* unsigned int (1) marker = 1;
* unsigned int (7) version = 1;
* unsigned int (3) seq_profile;
* unsigned int (5) seq_level_idx_0;
* unsigned int (1) seq_tier_0;
* unsigned int (1) high_bitdepth;
* unsigned int (1) twelve_bit;
* unsigned int (1) monochrome;
* unsigned int (1) chroma_subsampling_x;
* unsigned int (1) chroma_subsampling_y;
* unsigned int (2) chroma_sample_position;
* unsigned int (3) reserved = 0;
*
* unsigned int (1) initial_presentation_delay_present;
* if (initial_presentation_delay_present) {
* unsigned int (4) initial_presentation_delay_minus_one;
* } else {
* unsigned int (4) reserved = 0;
* }
*
* unsigned int (8) configOBUs[];
*
* rest: OBUs.
*/
if (av1_data[9] != 0) {
GST_WARNING ("Unknown version %d of av1C box", av1_data[9]);
break;
switch (av1_data[9]) {
case 0x81:{
guint8 pres_delay_field;
/* We let profile and the other parts be figured out by
* av1parse and only include the presentation delay here
* if present */
/* We skip initial_presentation_delay* for now */
pres_delay_field = *(av1_data + 11);
if (pres_delay_field & (1 << 5)) {
gst_caps_set_simple (entry->caps,
"presentation-delay", G_TYPE_INT,
(gint) (pres_delay_field & 0x0F) + 1, NULL);
}
buf = gst_buffer_new_and_alloc (size);
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_HEADER);
gst_buffer_fill (buf, 0, av1_data + 8, size);
gst_caps_set_simple (entry->caps,
"codec_data", GST_TYPE_BUFFER, buf, NULL);
gst_buffer_unref (buf);
}
default:
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: