static guint
find_psc (GstBuffer * buffer, guint skip)
{
GstByteReader br;
guint psc_pos = -1, psc;
gst_byte_reader_init_from_buffer (&br, buffer);
if (!gst_byte_reader_set_pos (&br, skip))
goto out;
gst_byte_reader_peek_uint24_be (&br, &psc);
/* Scan for the picture start code (22 bits - 0x0020) */
while ((gst_byte_reader_get_remaining (&br) >= 3)) {
if (gst_byte_reader_peek_uint24_be (&br, &psc) &&
((psc & 0xffffc0) == 0x000080)) {
psc_pos = gst_byte_reader_get_pos (&br);
break;
} else
gst_byte_reader_skip (&br, 1);
}
out:
return psc_pos;
}
/**
* gst_tag_list_from_exif_buffer_with_tiff_header:
* @buffer: The exif buffer
*
* Parses the exif tags starting with a tiff header structure.
*
* Returns: The taglist
*
* Since: 0.10.30
*/
GstTagList *
gst_tag_list_from_exif_buffer_with_tiff_header (const GstBuffer * buffer)
{
GstByteReader reader;
guint16 fortytwo = 42;
guint16 endianness = 0;
guint32 offset;
GstTagList *taglist = NULL;
GstBuffer *subbuffer;
GST_LOG ("Parsing exif tags with tiff header of size %u",
GST_BUFFER_SIZE (buffer));
gst_byte_reader_init_from_buffer (&reader, buffer);
GST_LOG ("Parsing the tiff header");
if (!gst_byte_reader_get_uint16_be (&reader, &endianness)) {
goto byte_reader_fail;
}
if (endianness == TIFF_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint16_le (&reader, &fortytwo) ||
!gst_byte_reader_get_uint32_le (&reader, &offset))
goto byte_reader_fail;
} else if (endianness == TIFF_BIG_ENDIAN) {
if (!gst_byte_reader_get_uint16_be (&reader, &fortytwo) ||
!gst_byte_reader_get_uint32_be (&reader, &offset))
goto byte_reader_fail;
} else {
GST_WARNING ("Invalid endianness number %u", endianness);
return NULL;
}
if (fortytwo != 42) {
GST_WARNING ("Invalid magic number %u, should be 42", fortytwo);
return NULL;
}
subbuffer = gst_buffer_new_and_alloc (GST_BUFFER_SIZE (buffer) -
(TIFF_HEADER_SIZE - 2));
memcpy (GST_BUFFER_DATA (subbuffer),
GST_BUFFER_DATA (buffer) + TIFF_HEADER_SIZE,
GST_BUFFER_SIZE (buffer) - TIFF_HEADER_SIZE);
taglist = gst_tag_list_from_exif_buffer (subbuffer,
endianness == TIFF_LITTLE_ENDIAN ? G_LITTLE_ENDIAN : G_BIG_ENDIAN, 8);
gst_buffer_unref (subbuffer);
return taglist;
byte_reader_fail:
{
GST_WARNING ("Failed to read values from buffer");
return NULL;
}
}
static void
parse_exif_rational_tag (GstExifReader * exif_reader,
const gchar * gst_tag, guint32 count, guint32 offset, gdouble multiplier)
{
GstByteReader data_reader;
guint32 real_offset;
guint32 frac_n = 0;
guint32 frac_d = 1;
gdouble value;
if (count > 1) {
GST_WARNING ("Rationals with multiple entries are not supported");
}
if (offset < exif_reader->base_offset) {
GST_WARNING ("Offset is smaller (%u) than base offset (%u)", offset,
exif_reader->base_offset);
return;
}
real_offset = offset - exif_reader->base_offset;
if (real_offset >= GST_BUFFER_SIZE (exif_reader->buffer)) {
GST_WARNING ("Invalid offset %u for buffer of size %u, not adding tag %s",
real_offset, GST_BUFFER_SIZE (exif_reader->buffer), gst_tag);
return;
}
gst_byte_reader_init_from_buffer (&data_reader, exif_reader->buffer);
if (!gst_byte_reader_set_pos (&data_reader, real_offset))
goto reader_fail;
if (exif_reader->byte_order == G_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint32_le (&data_reader, &frac_n) ||
!gst_byte_reader_get_uint32_le (&data_reader, &frac_d))
goto reader_fail;
} else {
if (!gst_byte_reader_get_uint32_be (&data_reader, &frac_n) ||
!gst_byte_reader_get_uint32_be (&data_reader, &frac_d))
goto reader_fail;
}
GST_DEBUG ("Read fraction for tag %s: %u/%u", gst_tag, frac_n, frac_d);
gst_util_fraction_to_double (frac_n, frac_d, &value);
value *= multiplier;
GST_DEBUG ("Adding %s tag: %lf", gst_tag, value);
gst_tag_list_add (exif_reader->taglist, GST_TAG_MERGE_REPLACE, gst_tag, value,
NULL);
return;
reader_fail:
GST_WARNING ("Failed to read from byte reader. (Buffer too short?)");
}
/* finds next startcode == 00 00 01, along with a subsequent byte */
static guint
gst_h264_parse_find_sc (GstBuffer * buffer, guint skip)
{
GstByteReader br;
guint sc_pos = -1;
gst_byte_reader_init_from_buffer (&br, buffer);
/* NALU not empty, so we can at least expect 1 (even 2) bytes following sc */
sc_pos = gst_byte_reader_masked_scan_uint32 (&br, 0xffffff00, 0x00000100,
skip, gst_byte_reader_get_remaining (&br) - skip);
return sc_pos;
}
static void
gst_vdp_mpeg_packetizer_init (GstVdpMpegPacketizer * packetizer,
GstBuffer * buffer)
{
guint offset;
gst_byte_reader_init_from_buffer (&packetizer->reader, buffer);
packetizer->buffer = buffer;
offset = gst_byte_reader_masked_scan_uint32 (&packetizer->reader, 0xffffff00,
0x00000100, 0, gst_byte_reader_get_remaining (&packetizer->reader));
packetizer->start = offset;
}
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;
}
}
}
static gboolean
parse_exif_ifd (GstExifReader * exif_reader, gint buf_offset,
const GstExifTagMatch * tag_map)
{
GstByteReader reader;
guint16 entries = 0;
guint16 i;
g_return_val_if_fail (exif_reader->byte_order == G_LITTLE_ENDIAN
|| exif_reader->byte_order == G_BIG_ENDIAN, FALSE);
gst_byte_reader_init_from_buffer (&reader, exif_reader->buffer);
if (!gst_byte_reader_set_pos (&reader, buf_offset)) {
GST_WARNING ("Buffer offset invalid when parsing exif ifd");
return FALSE;
}
/* read the IFD entries number */
if (exif_reader->byte_order == G_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint16_le (&reader, &entries))
goto read_error;
} else {
if (!gst_byte_reader_get_uint16_be (&reader, &entries))
goto read_error;
}
GST_DEBUG ("Read number of entries: %u", entries);
/* iterate over the buffer and find the tags and stuff */
for (i = 0; i < entries; i++) {
GstExifTagData tagdata;
gint map_index;
GST_LOG ("Reading entry: %u", i);
if (!parse_exif_tag_header (&reader, exif_reader->byte_order, &tagdata))
goto read_error;
GST_DEBUG ("Parsed tag: id 0x%x, type %u, count %u, offset %u (0x%x)",
tagdata.tag, tagdata.tag_type, tagdata.count, tagdata.offset,
tagdata.offset);
map_index = exif_tag_map_find_reverse (tagdata.tag, tag_map, TRUE);
if (map_index == -1) {
GST_WARNING ("Unmapped exif tag: 0x%x", tagdata.tag);
continue;
}
/* inner ifd tags handling */
if (tagdata.tag == EXIF_GPS_IFD_TAG) {
i += parse_exif_ifd (exif_reader,
tagdata.offset - exif_reader->base_offset, tag_map_gps);
continue;
}
/* tags that need specialized deserialization */
if (tag_map[map_index].deserialize) {
i += tag_map[map_index].deserialize (exif_reader, &reader,
&tag_map[map_index], &tagdata);
continue;
}
switch (tagdata.tag_type) {
case EXIF_TYPE_ASCII:
parse_exif_ascii_tag (exif_reader, tag_map[map_index].gst_tag,
tagdata.count, tagdata.offset, tagdata.offset_as_data);
break;
case EXIF_TYPE_RATIONAL:
parse_exif_rational_tag (exif_reader, tag_map[map_index].gst_tag,
tagdata.count, tagdata.offset, 1);
break;
default:
GST_WARNING ("Unhandled tag type: %u", tagdata.tag_type);
break;
}
}
return TRUE;
read_error:
{
GST_WARNING ("Failed to parse the exif ifd");
return FALSE;
}
}
static gint
deserialize_geo_coordinate (GstExifReader * exif_reader,
GstByteReader * reader, const GstExifTagMatch * exiftag,
GstExifTagData * tagdata)
{
GstByteReader fractions_reader;
gint multiplier;
GstExifTagData next_tagdata;
gint ret = 0;
/* for the conversion */
guint32 degrees_n = 0;
guint32 degrees_d = 1;
guint32 minutes_n = 0;
guint32 minutes_d = 1;
guint32 seconds_n = 0;
guint32 seconds_d = 1;
gdouble degrees;
gdouble minutes;
gdouble seconds;
GST_LOG ("Starting to parse %s tag in exif 0x%x", exiftag->gst_tag,
exiftag->exif_tag);
if (exiftag->complementary_tag != tagdata->tag) {
/* First should come the 'Ref' tags */
GST_WARNING ("Tag %d is not the 'Ref' tag for latitude nor longitude",
tagdata->tag);
return ret;
}
if (tagdata->offset_as_data[0] == 'N' || tagdata->offset_as_data[0] == 'E') {
multiplier = 1;
} else if (tagdata->offset_as_data[0] == 'S'
|| tagdata->offset_as_data[0] == 'W') {
multiplier = -1;
} else {
GST_WARNING ("Invalid LatitudeRef or LongitudeRef %c",
tagdata->offset_as_data[0]);
return ret;
}
/* now read the following tag that must be the latitude or longitude */
if (exif_reader->byte_order == G_LITTLE_ENDIAN) {
if (!gst_byte_reader_peek_uint16_le (reader, &next_tagdata.tag))
goto reader_fail;
} else {
if (!gst_byte_reader_peek_uint16_be (reader, &next_tagdata.tag))
goto reader_fail;
}
if (exiftag->exif_tag != next_tagdata.tag) {
GST_WARNING ("This is not a geo cordinate tag");
return ret;
}
/* read the remaining tag entry data */
if (!parse_exif_tag_header (reader, exif_reader->byte_order, &next_tagdata)) {
ret = -1;
goto reader_fail;
}
ret = 1;
/* some checking */
if (next_tagdata.tag_type != EXIF_TYPE_RATIONAL) {
GST_WARNING ("Invalid type %d for geo coordinate (latitude/longitude)",
next_tagdata.tag_type);
return ret;
}
if (next_tagdata.count != 3) {
GST_WARNING ("Geo coordinate should use 3 fractions, we have %u",
next_tagdata.count);
return ret;
}
/* now parse the fractions */
gst_byte_reader_init_from_buffer (&fractions_reader, exif_reader->buffer);
if (!gst_byte_reader_set_pos (&fractions_reader,
next_tagdata.offset - exif_reader->base_offset))
goto reader_fail;
if (exif_reader->byte_order == G_LITTLE_ENDIAN) {
if (!gst_byte_reader_get_uint32_le (&fractions_reader, °rees_n) ||
!gst_byte_reader_get_uint32_le (&fractions_reader, °rees_d) ||
!gst_byte_reader_get_uint32_le (&fractions_reader, &minutes_n) ||
!gst_byte_reader_get_uint32_le (&fractions_reader, &minutes_d) ||
!gst_byte_reader_get_uint32_le (&fractions_reader, &seconds_n) ||
!gst_byte_reader_get_uint32_le (&fractions_reader, &seconds_d))
goto reader_fail;
} else {
if (!gst_byte_reader_get_uint32_be (&fractions_reader, °rees_n) ||
!gst_byte_reader_get_uint32_be (&fractions_reader, °rees_d) ||
!gst_byte_reader_get_uint32_be (&fractions_reader, &minutes_n) ||
!gst_byte_reader_get_uint32_be (&fractions_reader, &minutes_d) ||
!gst_byte_reader_get_uint32_be (&fractions_reader, &seconds_n) ||
!gst_byte_reader_get_uint32_be (&fractions_reader, &seconds_d))
goto reader_fail;
}
GST_DEBUG ("Read degrees fraction for tag %s: %u/%u %u/%u %u/%u",
exiftag->gst_tag, degrees_n, degrees_d, minutes_n, minutes_d,
seconds_n, seconds_d);
gst_util_fraction_to_double (degrees_n, degrees_d, °rees);
gst_util_fraction_to_double (minutes_n, minutes_d, &minutes);
gst_util_fraction_to_double (seconds_n, seconds_d, &seconds);
minutes += seconds / 60;
degrees += minutes / 60;
degrees *= multiplier;
GST_DEBUG ("Adding %s tag: %lf", exiftag->gst_tag, degrees);
gst_tag_list_add (exif_reader->taglist, GST_TAG_MERGE_REPLACE,
exiftag->gst_tag, degrees, NULL);
return ret;
reader_fail:
GST_WARNING ("Failed to read fields from buffer (too short?)");
return ret;
}
