static gboolean
gst_irtsp_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstIRTSPParse *IRTSPParse = GST_IRTSP_PARSE (parse);
GstBuffer *buf = frame->buffer;
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
gint off;
if (G_UNLIKELY (GST_BUFFER_SIZE (buf) < 4))
return FALSE;
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffff0000,
0x24000000 + (IRTSPParse->channel_id << 16), 0, GST_BUFFER_SIZE (buf));
GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
/* didn't find anything that looks like a sync word, skip */
if (off < 0) {
*skipsize = GST_BUFFER_SIZE (buf) - 3;
return FALSE;
}
/* possible frame header, but not at offset 0? skip bytes before sync */
if (off > 0) {
*skipsize = off;
return FALSE;
}
*framesize = GST_READ_UINT16_BE (GST_BUFFER_DATA (frame->buffer) + 2) + 4;
GST_LOG_OBJECT (parse, "got frame size %d", *framesize);
return TRUE;
}
static GstFlowReturn
gst_jp2k_decimator_decimate_jpc (GstJP2kDecimator * self, GstBuffer * inbuf,
GstBuffer ** outbuf_)
{
GstBuffer *outbuf = NULL;
GstFlowReturn ret = GST_FLOW_OK;
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (inbuf);
GstByteWriter writer;
MainHeader main_header;
gst_byte_writer_init_with_size (&writer, GST_BUFFER_SIZE (inbuf), FALSE);
/* main header */
memset (&main_header, 0, sizeof (MainHeader));
ret = parse_main_header (self, &reader, &main_header);
if (ret != GST_FLOW_OK)
goto done;
ret = decimate_main_header (self, &main_header);
if (ret != GST_FLOW_OK)
goto done;
ret = write_main_header (self, &writer, &main_header);
if (ret != GST_FLOW_OK)
goto done;
outbuf = gst_byte_writer_reset_and_get_buffer (&writer);
gst_buffer_copy_metadata (outbuf, inbuf, GST_BUFFER_COPY_ALL);
GST_DEBUG_OBJECT (self,
"Decimated buffer from %u bytes to %u bytes (%.2lf%%)",
GST_BUFFER_SIZE (inbuf), GST_BUFFER_SIZE (outbuf),
(100 * GST_BUFFER_SIZE (outbuf)) / ((gdouble) GST_BUFFER_SIZE (inbuf)));
done:
*outbuf_ = outbuf;
reset_main_header (self, &main_header);
gst_buffer_unref (inbuf);
return ret;
}
static gboolean
gst_jpeg_parse_read_header (GstJpegParse * parse, GstBuffer * buffer)
{
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buffer);
guint8 marker = 0;
gboolean foundSOF = FALSE;
if (!gst_byte_reader_peek_uint8 (&reader, &marker))
goto error;
while (marker == 0xff) {
if (!gst_byte_reader_skip (&reader, 1))
goto error;
if (!gst_byte_reader_get_uint8 (&reader, &marker))
goto error;
GST_DEBUG_OBJECT (parse, "marker = %x", marker);
switch (marker) {
case SOS: /* start of scan (begins compressed data) */
return foundSOF;
case SOI:
break;
case DRI:
if (!gst_byte_reader_skip (&reader, 4)) /* fixed size */
goto error;
break;
case COM:
if (!gst_jpeg_parse_com (parse, &reader))
goto error;
break;
case APP1:
if (!gst_jpeg_parse_app1 (parse, &reader))
goto error;
break;
case DHT:
case DQT:
/* Ignore these codes */
if (!gst_jpeg_parse_skip_marker (parse, &reader, marker))
goto error;
break;
case SOF2:
parse->priv->interlaced = TRUE;
/* fall through */
case SOF0:
foundSOF = TRUE;
/* parse Start Of Frame */
if (!gst_jpeg_parse_sof (parse, &reader))
goto error;
return TRUE;
default:
if (marker == JPG || (marker >= JPG0 && marker <= JPG13)) {
/* we'd like to remove them from the buffer */
if (!gst_jpeg_parse_remove_marker (parse, &reader, marker, buffer))
goto error;
} else if (marker >= APP0 && marker <= APP15) {
if (!gst_jpeg_parse_skip_marker (parse, &reader, marker))
goto error;
} else {
GST_WARNING_OBJECT (parse, "unhandled marker %x, leaving", marker);
/* Not SOF or SOI. Must not be a JPEG file (or file pointer
* is placed wrong). In either case, it's an error. */
return FALSE;
}
}
if (!gst_byte_reader_peek_uint8 (&reader, &marker))
goto error;
}
return foundSOF;
error:
GST_WARNING_OBJECT (parse,
"Error parsing image header (need more than %u bytes available)",
gst_byte_reader_get_remaining (&reader));
return FALSE;
}
static gboolean
gst_jif_mux_parse_image (GstJifMux * self, GstBuffer * buf)
{
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
GstJifMuxMarker *m;
guint8 marker = 0;
guint16 size = 0;
const guint8 *data = NULL;
GST_LOG_OBJECT (self, "Received buffer of size: %u", GST_BUFFER_SIZE (buf));
if (!gst_byte_reader_peek_uint8 (&reader, &marker))
goto error;
while (marker == 0xff) {
if (!gst_byte_reader_skip (&reader, 1))
goto error;
if (!gst_byte_reader_get_uint8 (&reader, &marker))
goto error;
switch (marker) {
case RST0:
case RST1:
case RST2:
case RST3:
case RST4:
case RST5:
case RST6:
case RST7:
case SOI:
GST_DEBUG_OBJECT (self, "marker = %x", marker);
m = gst_jif_mux_new_marker (marker, 0, NULL, FALSE);
self->priv->markers = g_list_prepend (self->priv->markers, m);
break;
case EOI:
GST_DEBUG_OBJECT (self, "marker = %x", marker);
m = gst_jif_mux_new_marker (marker, 0, NULL, FALSE);
self->priv->markers = g_list_prepend (self->priv->markers, m);
goto done;
break;
default:
if (!gst_byte_reader_get_uint16_be (&reader, &size))
goto error;
if (!gst_byte_reader_get_data (&reader, size - 2, &data))
goto error;
m = gst_jif_mux_new_marker (marker, size - 2, data, FALSE);
self->priv->markers = g_list_prepend (self->priv->markers, m);
GST_DEBUG_OBJECT (self, "marker = %2x, size = %u", marker, size);
break;
}
if (marker == SOS) {
gint eoi_pos = -1;
gint i;
/* search the last 5 bytes for the EOI marker */
g_assert (GST_BUFFER_SIZE (buf) >= 5);
for (i = 5; i >= 2; i--) {
if (GST_BUFFER_DATA (buf)[GST_BUFFER_SIZE (buf) - i] == 0xFF &&
GST_BUFFER_DATA (buf)[GST_BUFFER_SIZE (buf) - i + 1] == EOI) {
eoi_pos = GST_BUFFER_SIZE (buf) - i;
break;
}
}
if (eoi_pos == -1) {
GST_WARNING_OBJECT (self, "Couldn't find an EOI marker");
eoi_pos = GST_BUFFER_SIZE (buf);
}
/* remaining size except EOI is scan data */
self->priv->scan_size = eoi_pos - gst_byte_reader_get_pos (&reader);
if (!gst_byte_reader_get_data (&reader, self->priv->scan_size,
&self->priv->scan_data))
goto error;
GST_DEBUG_OBJECT (self, "scan data, size = %u", self->priv->scan_size);
}
if (!gst_byte_reader_peek_uint8 (&reader, &marker))
goto error;
}
GST_INFO_OBJECT (self, "done parsing at 0x%x / 0x%x",
gst_byte_reader_get_pos (&reader), GST_BUFFER_SIZE (buf));
done:
self->priv->markers = g_list_reverse (self->priv->markers);
return TRUE;
error:
GST_WARNING_OBJECT (self,
"Error parsing image header (need more that %u bytes available)",
gst_byte_reader_get_remaining (&reader));
return FALSE;
}
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 gboolean
gst_ac3_parse_check_valid_frame (GstBaseParse * parse,
GstBaseParseFrame * frame, guint * framesize, gint * skipsize)
{
GstAc3Parse *ac3parse = GST_AC3_PARSE (parse);
GstBuffer *buf = frame->buffer;
GstByteReader reader = GST_BYTE_READER_INIT_FROM_BUFFER (buf);
gint off;
gboolean lost_sync, draining, eac, more = FALSE;
guint frmsiz, blocks, sid;
gint have_blocks = 0;
if (G_UNLIKELY (GST_BUFFER_SIZE (buf) < 6))
return FALSE;
off = gst_byte_reader_masked_scan_uint32 (&reader, 0xffff0000, 0x0b770000,
0, GST_BUFFER_SIZE (buf));
GST_LOG_OBJECT (parse, "possible sync at buffer offset %d", off);
/* didn't find anything that looks like a sync word, skip */
if (off < 0) {
*skipsize = GST_BUFFER_SIZE (buf) - 3;
return FALSE;
}
/* possible frame header, but not at offset 0? skip bytes before sync */
if (off > 0) {
*skipsize = off;
return FALSE;
}
/* make sure the values in the frame header look sane */
if (!gst_ac3_parse_frame_header (ac3parse, buf, 0, &frmsiz, NULL, NULL,
&blocks, &sid, &eac)) {
*skipsize = off + 2;
return FALSE;
}
*framesize = frmsiz;
if (G_UNLIKELY (g_atomic_int_get (&ac3parse->align) ==
GST_AC3_PARSE_ALIGN_NONE))
gst_ac3_parse_set_alignment (ac3parse, eac);
GST_LOG_OBJECT (parse, "got frame");
lost_sync = GST_BASE_PARSE_LOST_SYNC (parse);
draining = GST_BASE_PARSE_DRAINING (parse);
if (g_atomic_int_get (&ac3parse->align) == GST_AC3_PARSE_ALIGN_IEC61937) {
/* We need 6 audio blocks from each substream, so we keep going forwards
* till we have it */
g_assert (blocks > 0);
GST_LOG_OBJECT (ac3parse, "Need %d frames before pushing", 6 / blocks);
if (sid != 0) {
/* We need the first substream to be the one with id 0 */
GST_LOG_OBJECT (ac3parse, "Skipping till we find sid 0");
*skipsize = off + 2;
return FALSE;
}
*framesize = 0;
/* Loop till we have 6 blocks per substream */
for (have_blocks = 0; !more && have_blocks < 6; have_blocks += blocks) {
/* Loop till we get one frame from each substream */
do {
*framesize += frmsiz;
if (!gst_byte_reader_skip (&reader, frmsiz) ||
GST_BUFFER_SIZE (buf) < (*framesize + 6)) {
more = TRUE;
break;
}
if (!gst_ac3_parse_frame_header (ac3parse, buf, *framesize, &frmsiz,
NULL, NULL, NULL, &sid, &eac)) {
*skipsize = off + 2;
return FALSE;
}
} while (sid);
}
/* We're now at the next frame, so no need to skip if resyncing */
frmsiz = 0;
}
if (lost_sync && !draining) {
guint16 word = 0;
GST_DEBUG_OBJECT (ac3parse, "resyncing; checking next frame syncword");
if (more || !gst_byte_reader_skip (&reader, frmsiz) ||
!gst_byte_reader_get_uint16_be (&reader, &word)) {
GST_DEBUG_OBJECT (ac3parse, "... but not sufficient data");
gst_base_parse_set_min_frame_size (parse, *framesize + 6);
*skipsize = 0;
return FALSE;
} else {
if (word != 0x0b77) {
GST_DEBUG_OBJECT (ac3parse, "0x%x not OK", word);
*skipsize = off + 2;
return FALSE;
} else {
/* ok, got sync now, let's assume constant frame size */
gst_base_parse_set_min_frame_size (parse, *framesize);
}
}
}
return TRUE;
}
