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qtdemux: Simplify parsing of SVQ3/VP31 boxes

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8929>
This commit is contained in:
Sebastian Dröge 2025-05-05 21:54:07 +03:00 committed by GStreamer Marge Bot
parent 98d8bb9a12
commit 8687ef453c
1 changed files with 35 additions and 119 deletions
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146
subprojects/gst-plugins-good/gst/isomp4/qtdemux.c
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@ -11314,103 +11314,6 @@ done:
return TRUE;
}
/*
* Parses the stsd atom of a svq3 trak looking for
* the SMI and gama atoms.
*/
static void
qtdemux_parse_svq3_stsd_data (GstQTDemux * qtdemux,
const guint8 * stsd_entry_data, const guint8 ** gamma, GstBuffer ** seqh)
{
const guint8 *_gamma = NULL;
GstBuffer *_seqh = NULL;
const guint8 *stsd_data = stsd_entry_data;
guint32 length = QT_UINT32 (stsd_data);
guint16 version;
if (length < 32) {
GST_WARNING_OBJECT (qtdemux, "stsd too short");
goto end;
}
stsd_data += 16;
length -= 16;
version = QT_UINT16 (stsd_data);
if (version == 3) {
if (length >= 70) {
length -= 70;
stsd_data += 70;
while (length > 8) {
guint32 fourcc, size;
const guint8 *data;
size = QT_UINT32 (stsd_data);
fourcc = QT_FOURCC (stsd_data + 4);
data = stsd_data + 8;
if (size == 0) {
GST_WARNING_OBJECT (qtdemux, "Atom of size 0 found, aborting "
"svq3 atom parsing");
goto end;
}
switch (fourcc) {
case FOURCC_gama:{
if (size == 12) {
_gamma = data;
} else {
GST_WARNING_OBJECT (qtdemux, "Unexpected size %" G_GUINT32_FORMAT
" for gama atom, expected 12", size);
}
break;
}
case FOURCC_SMI_:{
if (size > 16 && QT_FOURCC (data) == FOURCC_SEQH) {
guint32 seqh_size;
if (_seqh != NULL) {
GST_WARNING_OBJECT (qtdemux, "Unexpected second SEQH SMI atom "
" found, ignoring");
} else {
/* Note: The size does *not* include the fourcc and the size field itself */
seqh_size = QT_UINT32 (data + 4);
if (seqh_size > 0 && seqh_size <= size - 8) {
_seqh = gst_buffer_new_and_alloc (seqh_size);
gst_buffer_fill (_seqh, 0, data + 8, seqh_size);
}
}
}
break;
}
default:{
GST_WARNING_OBJECT (qtdemux, "Unhandled atom %" GST_FOURCC_FORMAT
" in SVQ3 entry in stsd atom", GST_FOURCC_ARGS (fourcc));
}
}
if (size <= length) {
length -= size;
stsd_data += size;
}
}
} else {
GST_WARNING_OBJECT (qtdemux, "SVQ3 entry too short in stsd atom");
}
} else {
GST_WARNING_OBJECT (qtdemux, "Unexpected version for SVQ3 entry %"
G_GUINT16_FORMAT, version);
goto end;
}
end:
if (gamma) {
*gamma = _gamma;
}
if (seqh) {
*seqh = _seqh;
} else if (_seqh) {
gst_buffer_unref (_seqh);
}
}
static gchar *
qtdemux_get_rtsp_uri_from_hndl (GstQTDemux * qtdemux, GNode * minf)
{
@ -14788,6 +14691,7 @@ qtdemux_parse_trak (GstQTDemux * qtdemux, GNode * trak, guint32 * mvhd_matrix)
GNode *colr;
GNode *fiel;
GNode *pasp;
guint32 version;
gboolean gray;
gint depth, palette_size, palette_count;
guint32 *palette_data = NULL;
@ -14802,6 +14706,7 @@ qtdemux_parse_trak (GstQTDemux * qtdemux, GNode * trak, guint32 * mvhd_matrix)
if (len < 86)
goto corrupt_file;
version = QT_UINT32 (stsd_entry_data + offset);
entry->width = QT_UINT16 (stsd_entry_data + offset + 16);
entry->height = QT_UINT16 (stsd_entry_data + offset + 18);
entry->fps_n = 0; /* this is filled in later */
@ -15460,31 +15365,42 @@ qtdemux_parse_trak (GstQTDemux * qtdemux, GNode * trak, guint32 * mvhd_matrix)
case FOURCC_SVQ3:
case FOURCC_VP31:
{
GstBuffer *buf;
GstBuffer *seqh = NULL;
const guint8 *gamma_data = NULL;
guint len = QT_UINT32 (stsd_data); /* FIXME review - why put the whole stsd in codec data? */
if (version >> 16 == 3) {
GNode *gama, *smi;
qtdemux_parse_svq3_stsd_data (qtdemux, stsd_entry_data, &gamma_data,
&seqh);
if (gamma_data) {
gst_caps_set_simple (entry->caps, "applied-gamma", G_TYPE_DOUBLE,
QT_FP32 (gamma_data), NULL);
gama = qtdemux_tree_get_child_by_type (stsd_entry, FOURCC_gama);
if (gama) {
guint32 size = QT_UINT32 (gama->data);
if (size == 12) {
gdouble gamma = QT_FP32 ((const guint8 *) gama->data + 8);
gst_caps_set_simple (entry->caps, "applied-gamma",
G_TYPE_DOUBLE, gamma, NULL);
}
if (seqh) {
}
smi = qtdemux_tree_get_child_by_type (stsd_entry, FOURCC_SMI_);
if (smi) {
const guint8 *data = smi->data;
guint32 size = QT_UINT32 (data);
// This has first a fourcc and then the size
if (size > 16 && QT_FOURCC (data + 8) == FOURCC_SEQH) {
guint32 seqh_size = QT_UINT32 (data + 8 + 4);
if (seqh_size > 0 && seqh_size <= size - 8 - 8) {
GstBuffer *seqh = gst_buffer_new_and_alloc (seqh_size);
gst_buffer_fill (seqh, 0, data + 8 + 8, seqh_size);
/* sorry for the bad name, but we don't know what this is, other
* than its own fourcc */
gst_caps_set_simple (entry->caps, "seqh", GST_TYPE_BUFFER, seqh,
NULL);
gst_caps_set_simple (entry->caps, "seqh", GST_TYPE_BUFFER,
seqh, NULL);
gst_buffer_unref (seqh);
}
}
}
}
GST_DEBUG_OBJECT (qtdemux, "found codec_data in stsd");
buf = gst_buffer_new_and_alloc (len);
gst_buffer_fill (buf, 0, stsd_data, len);
gst_caps_set_simple (entry->caps,
"codec_data", GST_TYPE_BUFFER, buf, NULL);
gst_buffer_unref (buf);
break;
}
case FOURCC_jpeg: