static void
gst_cenc_decrypt_parse_pssh_box (GstCencDecrypt * self, GstBuffer * pssh)
{
GstMapInfo info;
GstByteReader br;
guint8 version;
guint32 data_size;
gst_buffer_map (pssh, &info, GST_MAP_READ);
gst_byte_reader_init (&br, info.data, info.size);
gst_byte_reader_skip_unchecked (&br, 8);
version = gst_byte_reader_get_uint8_unchecked (&br);
GST_DEBUG_OBJECT (self, "pssh version: %u", version);
gst_byte_reader_skip_unchecked (&br, 19);
if (version > 0) {
/* Parse KeyIDs */
guint32 key_id_count = 0;
const guint8 *key_id_data = NULL;
const guint key_id_size = 16;
key_id_count = gst_byte_reader_get_uint32_be_unchecked (&br);
GST_DEBUG_OBJECT (self, "there are %u key IDs", key_id_count);
key_id_data = gst_byte_reader_get_data_unchecked (&br, key_id_count * 16);
while (key_id_count > 0) {
gchar *key_id_string = gst_cenc_create_uuid_string (key_id_data);
GST_DEBUG_OBJECT (self, "key_id: %s", key_id_string);
g_free (key_id_string);
key_id_data += key_id_size;
--key_id_count;
}
}
/* Parse Data */
data_size = gst_byte_reader_get_uint32_be_unchecked (&br);
GST_DEBUG_OBJECT (self, "pssh data size: %u", data_size);
if (data_size > 0U) {
gpointer data =
g_memdup (gst_byte_reader_get_data_unchecked (&br, data_size),
data_size);
GstBuffer *buf = gst_buffer_new_wrapped (data, data_size);
GST_DEBUG_OBJECT (self, "cenc protection system data size: %"
G_GSIZE_FORMAT, gst_buffer_get_size (buf));
gst_buffer_unref (buf);
}
gst_buffer_unmap (pssh, &info);
}
/* gst_isoff_parse_box:
* @reader:
* @type: type that was found at the current position
* @extended_type: (allow-none): extended type if type=='uuid'
* @header_size: (allow-none): size of the box header (type, extended type and size)
* @size: size of the complete box including type, extended type and size
*
* Advances the byte reader to the start of the box content. To skip
* over the complete box, skip size - header_size bytes.
*
* Returns: TRUE if a box header could be parsed, FALSE if more data is needed
*/
gboolean
gst_isoff_parse_box_header (GstByteReader * reader, guint32 * type,
guint8 extended_type[16], guint * header_size, guint64 * size)
{
guint header_start_offset;
guint32 size_field;
header_start_offset = gst_byte_reader_get_pos (reader);
if (gst_byte_reader_get_remaining (reader) < 8)
goto not_enough_data;
size_field = gst_byte_reader_get_uint32_be_unchecked (reader);
*type = gst_byte_reader_get_uint32_le_unchecked (reader);
if (size_field == 1) {
if (gst_byte_reader_get_remaining (reader) < 8)
goto not_enough_data;
*size = gst_byte_reader_get_uint64_be_unchecked (reader);
} else {
*size = size_field;
}
if (*type == GST_ISOFF_FOURCC_UUID) {
if (gst_byte_reader_get_remaining (reader) < 16)
goto not_enough_data;
if (extended_type)
memcpy (extended_type, gst_byte_reader_get_data_unchecked (reader, 16),
16);
}
if (header_size)
*header_size = gst_byte_reader_get_pos (reader) - header_start_offset;
return TRUE;
not_enough_data:
gst_byte_reader_set_pos (reader, header_start_offset);
return FALSE;
}
static GstFlowReturn
gst_h264_parse_chain (GstPad * pad, GstBuffer * buffer)
{
GstH264Parse *h264parse = GST_H264_PARSE (GST_PAD_PARENT (pad));
if (h264parse->packetized && buffer) {
GstByteReader br;
GstBuffer *sub;
GstFlowReturn ret = GST_FLOW_OK;
guint32 len;
const guint nl = h264parse->nal_length_size;
GST_LOG_OBJECT (h264parse, "processing packet buffer of size %d",
GST_BUFFER_SIZE (buffer));
gst_byte_reader_init_from_buffer (&br, buffer);
while (ret == GST_FLOW_OK && gst_byte_reader_get_remaining (&br)) {
GST_DEBUG_OBJECT (h264parse, "AVC nal offset %d",
gst_byte_reader_get_pos (&br));
if (gst_byte_reader_get_remaining (&br) < nl)
goto parse_failed;
switch (nl) {
case 4:
len = gst_byte_reader_get_uint32_be_unchecked (&br);
break;
case 3:
len = gst_byte_reader_get_uint24_be_unchecked (&br);
break;
case 2:
len = gst_byte_reader_get_uint16_be_unchecked (&br);
break;
case 1:
len = gst_byte_reader_get_uint8_unchecked (&br);
break;
default:
goto not_negotiated;
break;
}
GST_DEBUG_OBJECT (h264parse, "AVC nal size %d", len);
if (gst_byte_reader_get_remaining (&br) < len)
goto parse_failed;
if (h264parse->split_packetized) {
/* convert to NAL aligned byte stream input */
sub = gst_h264_parse_wrap_nal (h264parse, GST_H264_PARSE_FORMAT_BYTE,
(guint8 *) gst_byte_reader_get_data_unchecked (&br, len), len);
/* at least this should make sense */
GST_BUFFER_TIMESTAMP (sub) = GST_BUFFER_TIMESTAMP (buffer);
GST_LOG_OBJECT (h264parse, "pushing NAL of size %d", len);
ret = h264parse->parse_chain (pad, sub);
} else {
/* pass-through: no looking for frames (and nal processing),
* so need to parse to collect data here */
/* NOTE: so if it is really configured to do so,
* pre_push can/will still insert codec-data at intervals,
* which is not really pure pass-through, but anyway ... */
gst_h264_parse_process_nal (h264parse,
GST_BUFFER_DATA (buffer), gst_byte_reader_get_pos (&br) - nl,
gst_byte_reader_get_pos (&br), len);
gst_byte_reader_skip_unchecked (&br, len);
}
}
if (h264parse->split_packetized)
return ret;
}
exit:
/* nal processing in pass-through might have collected stuff;
* ensure nothing happens with this later on */
gst_adapter_clear (h264parse->frame_out);
return h264parse->parse_chain (pad, buffer);
/* ERRORS */
not_negotiated:
{
GST_DEBUG_OBJECT (h264parse, "insufficient data to split input");
return GST_FLOW_NOT_NEGOTIATED;
}
parse_failed:
{
if (h264parse->split_packetized) {
GST_ELEMENT_ERROR (h264parse, STREAM, FAILED, (NULL),
("invalid AVC input data"));
return GST_FLOW_ERROR;
} else {
/* do not meddle to much in this case */
GST_DEBUG_OBJECT (h264parse, "parsing packet failed");
goto exit;
}
}
}
