static gboolean
gst_dirac_parse_start (GstBaseParse * parse)
{
GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);
gst_base_parse_set_min_frame_size (parse, 13);
diracparse->sent_codec_tag = FALSE;
return TRUE;
}
void
gst_dirac_parse_finalize (GObject * object)
{
GstDiracParse *diracparse;
g_return_if_fail (GST_IS_DIRAC_PARSE (object));
diracparse = GST_DIRAC_PARSE (object);
/* clean up object here */
G_OBJECT_CLASS (parent_class)->finalize (object);
}
void
gst_dirac_parse_dispose (GObject * object)
{
GstDiracParse *diracparse;
g_return_if_fail (GST_IS_DIRAC_PARSE (object));
diracparse = GST_DIRAC_PARSE (object);
/* clean up as possible. may be called multiple times */
G_OBJECT_CLASS (parent_class)->dispose (object);
}
void
gst_dirac_parse_get_property (GObject * object, guint property_id,
GValue * value, GParamSpec * pspec)
{
GstDiracParse *diracparse;
g_return_if_fail (GST_IS_DIRAC_PARSE (object));
diracparse = GST_DIRAC_PARSE (object);
switch (property_id) {
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
break;
}
}
static gboolean
gst_dirac_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (frame->buffer);
GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);
int off;
guint32 next_header;
gboolean sync;
gboolean drain;
if (G_UNLIKELY (GST_BUFFER_SIZE (frame->buffer) < 13))
return FALSE;
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
0x42424344, 0, GST_BUFFER_SIZE (frame->buffer));
if (off < 0) {
*skipsize = GST_BUFFER_SIZE (frame->buffer) - 3;
return FALSE;
}
GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
if (off > 0) {
GST_ERROR ("skipping %d", off);
*skipsize = off;
return FALSE;
}
if (!gst_dirac_parse_frame_header (diracparse, frame->buffer, framesize)) {
GST_ERROR ("bad header");
*skipsize = 3;
return FALSE;
}
GST_LOG ("framesize %d", *framesize);
sync = GST_BASE_PARSE_FRAME_SYNC (frame);
drain = GST_BASE_PARSE_FRAME_DRAIN (frame);
if (!sync && !drain) {
guint32 next_sync_word = 0;
next_header = GST_READ_UINT32_BE (GST_BUFFER_DATA (frame->buffer) + 5);
GST_LOG ("next header %d", next_header);
if (!gst_byte_reader_skip (&reader, next_header) ||
!gst_byte_reader_get_uint32_be (&reader, &next_sync_word)) {
gst_base_parse_set_min_frame_size (parse, next_header + 4);
*skipsize = 0;
return FALSE;
} else {
if (next_sync_word != 0x42424344) {
*skipsize = 3;
return FALSE;
} else {
gst_base_parse_set_min_frame_size (parse, next_header);
}
}
}
return TRUE;
}
static GstFlowReturn
gst_dirac_parse_handle_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, gint * skipsize)
{
int off;
guint32 next_header;
GstMapInfo map;
guint8 *data;
gsize size;
gboolean have_picture = FALSE;
int offset;
guint framesize = 0;
gst_buffer_map (frame->buffer, &map, GST_MAP_READ);
data = map.data;
size = map.size;
if (G_UNLIKELY (size < 13)) {
*skipsize = 1;
goto out;
}
GST_DEBUG ("%" G_GSIZE_FORMAT ": %02x %02x %02x %02x", size, data[0], data[1],
data[2], data[3]);
if (GST_READ_UINT32_BE (data) != 0x42424344) {
GstByteReader reader;
gst_byte_reader_init (&reader, data, size);
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffffffff,
0x42424344, 0, size);
if (off < 0) {
*skipsize = size - 3;
goto out;
}
GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
GST_DEBUG ("skipping %d", off);
*skipsize = off;
goto out;
}
/* have sync, parse chunks */
offset = 0;
while (!have_picture) {
GST_DEBUG ("offset %d:", offset);
if (offset + 13 >= size) {
framesize = offset + 13;
goto out;
}
GST_DEBUG ("chunk type %02x", data[offset + 4]);
if (GST_READ_UINT32_BE (data + offset) != 0x42424344) {
GST_DEBUG ("bad header");
*skipsize = 3;
goto out;
}
next_header = GST_READ_UINT32_BE (data + offset + 5);
GST_DEBUG ("next_header %d", next_header);
if (next_header == 0)
next_header = 13;
if (SCHRO_PARSE_CODE_IS_PICTURE (data[offset + 4])) {
have_picture = TRUE;
}
offset += next_header;
if (offset >= size) {
framesize = offset;
goto out;
}
}
gst_buffer_unmap (frame->buffer, &map);
framesize = offset;
GST_DEBUG ("framesize %d", framesize);
g_assert (framesize <= size);
if (data[4] == SCHRO_PARSE_CODE_SEQUENCE_HEADER) {
GstCaps *caps;
GstDiracParse *diracparse = GST_DIRAC_PARSE (parse);
DiracSequenceHeader sequence_header;
int ret;
ret = dirac_sequence_header_parse (&sequence_header, data + 13, size - 13);
if (ret) {
memcpy (&diracparse->sequence_header, &sequence_header,
sizeof (sequence_header));
caps = gst_caps_new_simple ("video/x-dirac",
"width", G_TYPE_INT, sequence_header.width,
"height", G_TYPE_INT, sequence_header.height,
"framerate", GST_TYPE_FRACTION,
sequence_header.frame_rate_numerator,
sequence_header.frame_rate_denominator,
"pixel-aspect-ratio", GST_TYPE_FRACTION,
sequence_header.aspect_ratio_numerator,
sequence_header.aspect_ratio_denominator,
"interlace-mode", G_TYPE_STRING,
sequence_header.interlaced ? "interleaved" : "progressive",
"profile", G_TYPE_STRING, get_profile_name (sequence_header.profile),
"level", G_TYPE_STRING, get_level_name (sequence_header.level), NULL);
gst_pad_set_caps (GST_BASE_PARSE_SRC_PAD (parse), caps);
gst_caps_unref (caps);
gst_base_parse_set_frame_rate (parse,
sequence_header.frame_rate_numerator,
sequence_header.frame_rate_denominator, 0, 0);
}
}
gst_base_parse_set_min_frame_size (parse, 13);
return gst_base_parse_finish_frame (parse, frame, framesize);
out:
gst_buffer_unmap (frame->buffer, &map);
if (framesize)
gst_base_parse_set_min_frame_size (parse, framesize);
return GST_FLOW_OK;
}
