static gint
gst_vdp_mpeg_dec_scan_for_sync (GstBaseVideoDecoder * base_video_decoder,
GstAdapter * adapter)
{
gint m;
m = gst_adapter_masked_scan_uint32 (adapter, 0xffffff00, 0x00000100, 0,
gst_adapter_available (adapter));
if (m == -1)
return gst_adapter_available (adapter) - SYNC_CODE_SIZE;
return m;
}
static gint
gst_vdp_h264_dec_scan_for_sync (GstBaseVideoDecoder * base_video_decoder,
GstAdapter * adapter)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
gint m;
if (h264_dec->packetized)
return 0;
m = gst_adapter_masked_scan_uint32 (adapter, 0xffffff00, 0x00000100,
0, gst_adapter_available (adapter));
if (m == -1)
return gst_adapter_available (adapter) - SYNC_CODE_SIZE;
return m;
}
/*
* gst_jpeg_parse_skip_to_jpeg_header:
* @parse: the parser
*
* Flush everything until the next JPEG header. The header is considered
* to be the a start marker SOI (0xff 0xd8) followed by any other marker
* (0xff ...).
*
* Returns: TRUE if the header was found, FALSE if more data is needed.
*/
static gboolean
gst_jpeg_parse_skip_to_jpeg_header (GstJpegParse * parse)
{
guint available, flush;
gboolean ret = TRUE;
available = gst_adapter_available (parse->priv->adapter);
if (available < 4)
return FALSE;
flush = gst_adapter_masked_scan_uint32 (parse->priv->adapter, 0xffffff00,
0xffd8ff00, 0, available);
if (flush == -1) {
flush = available - 3; /* Last 3 bytes + 1 more may match header. */
ret = FALSE;
}
if (flush > 0) {
GST_LOG_OBJECT (parse, "Skipping %u bytes.", flush);
gst_adapter_flush (parse->priv->adapter, flush);
}
return ret;
}
static GstBaseVideoDecoderScanResult
gst_vdp_mpeg_dec_scan_for_packet_end (GstBaseVideoDecoder * base_video_decoder,
GstAdapter * adapter, guint * size, gboolean at_eos)
{
guint8 *data;
guint32 sync_code;
data = g_slice_alloc (SYNC_CODE_SIZE);
gst_adapter_copy (adapter, data, 0, SYNC_CODE_SIZE);
sync_code = ((data[0] << 16) | (data[1] << 8) | data[2]);
if (sync_code != 0x000001)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_LOST_SYNC;
*size = gst_adapter_masked_scan_uint32 (adapter, 0xffffff00, 0x00000100,
SYNC_CODE_SIZE, gst_adapter_available (adapter) - SYNC_CODE_SIZE);
if (*size == -1)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_NEED_DATA;
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_OK;
}
static GstBaseVideoDecoderScanResult
gst_vdp_h264_dec_scan_for_packet_end (GstBaseVideoDecoder * base_video_decoder,
GstAdapter * adapter, guint * size, gboolean at_eos)
{
GstVdpH264Dec *h264_dec = GST_VDP_H264_DEC (base_video_decoder);
guint avail;
avail = gst_adapter_available (adapter);
if (avail < h264_dec->nal_length_size)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_NEED_DATA;
if (h264_dec->packetized) {
guint8 *data;
gint i;
guint32 nal_length = 0;
data = g_slice_alloc (h264_dec->nal_length_size);
gst_adapter_copy (adapter, data, 0, h264_dec->nal_length_size);
for (i = 0; i < h264_dec->nal_length_size; i++)
nal_length = (nal_length << 8) | data[i];
g_slice_free1 (h264_dec->nal_length_size, data);
nal_length += h264_dec->nal_length_size;
/* check for invalid NALU sizes, assume the size if the available bytes
* when something is fishy */
if (nal_length <= 1 || nal_length > avail) {
nal_length = avail - h264_dec->nal_length_size;
GST_DEBUG ("fixing invalid NALU size to %u", nal_length);
}
*size = nal_length;
}
else {
guint8 *data;
guint32 start_code;
guint n;
data = g_slice_alloc (SYNC_CODE_SIZE);
gst_adapter_copy (adapter, data, 0, SYNC_CODE_SIZE);
start_code = ((data[0] << 16) && (data[1] << 8) && data[2]);
g_slice_free1 (SYNC_CODE_SIZE, data);
GST_DEBUG ("start_code: %d", start_code);
if (start_code == 0x000001)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_LOST_SYNC;
n = gst_adapter_masked_scan_uint32 (adapter, 0xffffff00, 0x00000100,
SYNC_CODE_SIZE, avail - SYNC_CODE_SIZE);
if (n == -1)
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_NEED_DATA;
*size = n;
}
GST_DEBUG ("NAL size: %d", *size);
return GST_BASE_VIDEO_DECODER_SCAN_RESULT_OK;
}
/* returns image length in bytes if parsed successfully,
* otherwise 0 if more data needed,
* if < 0 the absolute value needs to be flushed */
static gint
gst_jpeg_parse_get_image_length (GstJpegParse * parse)
{
guint size;
gboolean resync;
GstAdapter *adapter = parse->priv->adapter;
gint offset, noffset;
size = gst_adapter_available (adapter);
/* we expect at least 4 bytes, first of which start marker */
if (gst_adapter_masked_scan_uint32 (adapter, 0xffff0000, 0xffd80000, 0, 4))
return 0;
GST_DEBUG ("Parsing jpeg image data (%u bytes)", size);
GST_DEBUG ("Parse state: offset=%d, resync=%d, entropy len=%d",
parse->priv->last_offset, parse->priv->last_resync,
parse->priv->last_entropy_len);
/* offset is 2 less than actual offset;
* - adapter needs at least 4 bytes for scanning,
* - start and end marker ensure at least that much
*/
/* resume from state offset */
offset = parse->priv->last_offset;
while (1) {
guint frame_len;
guint32 value;
noffset =
gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00, 0x0000ff00,
offset, size - offset, &value);
/* lost sync if 0xff marker not where expected */
if ((resync = (noffset != offset))) {
GST_DEBUG ("Lost sync at 0x%08x, resyncing", offset + 2);
}
/* may have marker, but could have been resyncng */
resync = resync || parse->priv->last_resync;
/* Skip over extra 0xff */
while ((noffset >= 0) && ((value & 0xff) == 0xff)) {
noffset++;
noffset =
gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00, 0x0000ff00,
noffset, size - noffset, &value);
}
/* enough bytes left for marker? (we need 0xNN after the 0xff) */
if (noffset < 0) {
GST_DEBUG ("at end of input and no EOI marker found, need more data");
goto need_more_data;
}
/* now lock on the marker we found */
offset = noffset;
value = value & 0xff;
if (value == 0xd9) {
GST_DEBUG ("0x%08x: EOI marker", offset + 2);
/* clear parse state */
parse->priv->last_resync = FALSE;
parse->priv->last_offset = 0;
return (offset + 4);
} else if (value == 0xd8) {
/* Skip this frame if we found another SOI marker */
GST_DEBUG ("0x%08x: SOI marker before EOI, skipping", offset + 2);
/* clear parse state */
parse->priv->last_resync = FALSE;
parse->priv->last_offset = 0;
return -(offset + 2);
}
if (value >= 0xd0 && value <= 0xd7)
frame_len = 0;
else {
/* peek tag and subsequent length */
if (offset + 2 + 4 > size)
goto need_more_data;
else
gst_adapter_masked_scan_uint32_peek (adapter, 0x0, 0x0, offset + 2, 4,
&frame_len);
frame_len = frame_len & 0xffff;
}
GST_DEBUG ("0x%08x: tag %02x, frame_len=%u", offset + 2, value, frame_len);
/* the frame length includes the 2 bytes for the length; here we want at
* least 2 more bytes at the end for an end marker */
if (offset + 2 + 2 + frame_len + 2 > size) {
goto need_more_data;
}
if (gst_jpeg_parse_parse_tag_has_entropy_segment (value)) {
guint eseglen = parse->priv->last_entropy_len;
GST_DEBUG ("0x%08x: finding entropy segment length", offset + 2);
noffset = offset + 2 + frame_len + eseglen;
while (1) {
noffset = gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00,
0x0000ff00, noffset, size - noffset, &value);
if (noffset < 0) {
/* need more data */
parse->priv->last_entropy_len = size - offset - 4 - frame_len - 2;
goto need_more_data;
}
if ((value & 0xff) != 0x00) {
eseglen = noffset - offset - frame_len - 2;
break;
}
noffset++;
}
parse->priv->last_entropy_len = 0;
frame_len += eseglen;
GST_DEBUG ("entropy segment length=%u => frame_len=%u", eseglen,
frame_len);
}
if (resync) {
/* check if we will still be in sync if we interpret
* this as a sync point and skip this frame */
noffset = offset + frame_len + 2;
noffset = gst_adapter_masked_scan_uint32 (adapter, 0x0000ff00, 0x0000ff00,
noffset, 4);
if (noffset < 0) {
/* ignore and continue resyncing until we hit the end
* of our data or find a sync point that looks okay */
offset++;
continue;
}
GST_DEBUG ("found sync at 0x%x", offset + 2);
}
offset += frame_len + 2;
}
/* EXITS */
need_more_data:
{
parse->priv->last_offset = offset;
parse->priv->last_resync = resync;
return 0;
}
}
static GstFlowReturn
gst_rtp_h263p_pay_flush (GstRtpH263PPay * rtph263ppay)
{
guint avail;
GstBufferList *list = NULL;
GstBuffer *outbuf = NULL;
GstFlowReturn ret;
gboolean fragmented = FALSE;
avail = gst_adapter_available (rtph263ppay->adapter);
if (avail == 0)
return GST_FLOW_OK;
fragmented = FALSE;
/* This algorithm assumes the H263/+/++ encoder sends complete frames in each
* buffer */
/* With Fragmentation Mode at GST_FRAGMENTATION_MODE_NORMAL:
* This algorithm implements the Follow-on packets method for packetization.
* This assumes low packet loss network.
* With Fragmentation Mode at GST_FRAGMENTATION_MODE_SYNC:
* This algorithm separates large frames at synchronisation points (Segments)
* (See RFC 4629 section 6). It would be interesting to have a property such as network
* quality to select between both packetization methods */
/* TODO Add VRC supprt (See RFC 4629 section 5.2) */
while (avail > 0) {
guint towrite;
guint8 *payload;
gint header_len;
guint next_gop = 0;
gboolean found_gob = FALSE;
GstRTPBuffer rtp = { NULL };
GstBuffer *payload_buf;
if (rtph263ppay->fragmentation_mode == GST_FRAGMENTATION_MODE_SYNC) {
/* start after 1st gop possible */
/* Check if we have a gob or eos , eossbs */
/* FIXME EOS and EOSSBS packets should never contain any gobs and vice-versa */
next_gop =
gst_adapter_masked_scan_uint32 (rtph263ppay->adapter, 0xffff8000,
0x00008000, 0, avail);
if (next_gop == 0) {
GST_DEBUG_OBJECT (rtph263ppay, " Found GOB header");
found_gob = TRUE;
}
/* Find next and cut the packet accordingly */
/* TODO we should get as many gobs as possible until MTU is reached, this
* code seems to just get one GOB per packet */
if (next_gop == 0 && avail > 3)
next_gop =
gst_adapter_masked_scan_uint32 (rtph263ppay->adapter, 0xffff8000,
0x00008000, 3, avail - 3);
GST_DEBUG_OBJECT (rtph263ppay, " Next GOB Detected at : %d", next_gop);
if (next_gop == -1)
next_gop = 0;
}
/* for picture start frames (non-fragmented), we need to remove the first
* two 0x00 bytes and set P=1 */
if (!fragmented || found_gob) {
gst_adapter_flush (rtph263ppay->adapter, 2);
avail -= 2;
}
header_len = 2;
towrite = MIN (avail, gst_rtp_buffer_calc_payload_len
(GST_RTP_BASE_PAYLOAD_MTU (rtph263ppay) - header_len, 0, 0));
if (next_gop > 0)
towrite = MIN (next_gop, towrite);
outbuf = gst_rtp_buffer_new_allocate (header_len, 0, 0);
gst_rtp_buffer_map (outbuf, GST_MAP_WRITE, &rtp);
/* last fragment gets the marker bit set */
gst_rtp_buffer_set_marker (&rtp, avail > towrite ? 0 : 1);
payload = gst_rtp_buffer_get_payload (&rtp);
/* 0 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | RR |P|V| PLEN |PEBIT|
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
/* if fragmented or gop header , write p bit =1 */
payload[0] = (fragmented && !found_gob) ? 0x00 : 0x04;
payload[1] = 0;
GST_BUFFER_PTS (outbuf) = rtph263ppay->first_timestamp;
GST_BUFFER_DURATION (outbuf) = rtph263ppay->first_duration;
gst_rtp_buffer_unmap (&rtp);
payload_buf = gst_adapter_take_buffer_fast (rtph263ppay->adapter, towrite);
gst_rtp_copy_meta (GST_ELEMENT_CAST (rtph263ppay), outbuf, payload_buf,
g_quark_from_static_string (GST_META_TAG_VIDEO_STR));
outbuf = gst_buffer_append (outbuf, payload_buf);
avail -= towrite;
/* If more data is available and this is our first iteration,
* we create a buffer list and remember that we're fragmented.
*
* If we're fragmented already, add buffers to the previously
* created buffer list.
*
* Otherwise fragmented will be FALSE and we just push the single output
* buffer, and no list is allocated.
*/
if (avail && !fragmented) {
fragmented = TRUE;
list = gst_buffer_list_new ();
gst_buffer_list_add (list, outbuf);
} else if (fragmented) {
gst_buffer_list_add (list, outbuf);
}
}
if (fragmented) {
ret =
gst_rtp_base_payload_push_list (GST_RTP_BASE_PAYLOAD (rtph263ppay),
list);
} else {
ret =
gst_rtp_base_payload_push (GST_RTP_BASE_PAYLOAD (rtph263ppay), outbuf);
}
return ret;
}
static GstFlowReturn
gst_jpeg_dec_parse (GstVideoDecoder * bdec, GstVideoCodecFrame * frame,
GstAdapter * adapter, gboolean at_eos)
{
guint size;
gint toadd = 0;
gboolean resync;
gint offset = 0, noffset;
GstJpegDec *dec = (GstJpegDec *) bdec;
/* FIXME : The overhead of using scan_uint32 is massive */
size = gst_adapter_available (adapter);
GST_DEBUG ("Parsing jpeg image data (%u bytes)", size);
if (at_eos) {
GST_DEBUG ("Flushing all data out");
toadd = size;
/* If we have leftover data, throw it away */
if (!dec->saw_header)
goto drop_frame;
goto have_full_frame;
}
if (size < 8)
goto need_more_data;
if (!dec->saw_header) {
gint ret;
/* we expect at least 4 bytes, first of which start marker */
ret =
gst_adapter_masked_scan_uint32 (adapter, 0xffff0000, 0xffd80000, 0,
size - 4);
GST_DEBUG ("ret:%d", ret);
if (ret < 0)
goto need_more_data;
if (ret) {
gst_adapter_flush (adapter, ret);
size -= ret;
}
dec->saw_header = TRUE;
}
while (1) {
guint frame_len;
guint32 value;
GST_DEBUG ("offset:%d, size:%d", offset, size);
noffset =
gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00, 0x0000ff00,
offset, size - offset, &value);
/* lost sync if 0xff marker not where expected */
if ((resync = (noffset != offset))) {
GST_DEBUG ("Lost sync at 0x%08x, resyncing", offset + 2);
}
/* may have marker, but could have been resyncng */
resync = resync || dec->parse_resync;
/* Skip over extra 0xff */
while ((noffset >= 0) && ((value & 0xff) == 0xff)) {
noffset++;
noffset =
gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00, 0x0000ff00,
noffset, size - noffset, &value);
}
/* enough bytes left for marker? (we need 0xNN after the 0xff) */
if (noffset < 0) {
GST_DEBUG ("at end of input and no EOI marker found, need more data");
goto need_more_data;
}
/* now lock on the marker we found */
offset = noffset;
value = value & 0xff;
if (value == 0xd9) {
GST_DEBUG ("0x%08x: EOI marker", offset + 2);
/* clear parse state */
dec->saw_header = FALSE;
dec->parse_resync = FALSE;
toadd = offset + 4;
goto have_full_frame;
}
if (value == 0xd8) {
/* Skip this frame if we found another SOI marker */
GST_DEBUG ("0x%08x: SOI marker before EOI, skipping", offset + 2);
dec->parse_resync = FALSE;
/* FIXME : Need to skip data */
toadd -= offset + 2;
goto have_full_frame;
}
if (value >= 0xd0 && value <= 0xd7)
frame_len = 0;
else {
/* peek tag and subsequent length */
if (offset + 2 + 4 > size)
goto need_more_data;
else
gst_adapter_masked_scan_uint32_peek (adapter, 0x0, 0x0, offset + 2, 4,
&frame_len);
frame_len = frame_len & 0xffff;
}
GST_DEBUG ("0x%08x: tag %02x, frame_len=%u", offset + 2, value, frame_len);
/* the frame length includes the 2 bytes for the length; here we want at
* least 2 more bytes at the end for an end marker */
if (offset + 2 + 2 + frame_len + 2 > size) {
goto need_more_data;
}
if (gst_jpeg_dec_parse_tag_has_entropy_segment (value)) {
guint eseglen = dec->parse_entropy_len;
GST_DEBUG ("0x%08x: finding entropy segment length (eseglen:%d)",
offset + 2, eseglen);
if (size < offset + 2 + frame_len + eseglen)
goto need_more_data;
noffset = offset + 2 + frame_len + dec->parse_entropy_len;
while (1) {
GST_DEBUG ("noffset:%d, size:%d, size - noffset:%d",
noffset, size, size - noffset);
noffset = gst_adapter_masked_scan_uint32_peek (adapter, 0x0000ff00,
0x0000ff00, noffset, size - noffset, &value);
if (noffset < 0) {
/* need more data */
dec->parse_entropy_len = size - offset - 4 - frame_len - 2;
goto need_more_data;
}
if ((value & 0xff) != 0x00) {
eseglen = noffset - offset - frame_len - 2;
break;
}
noffset++;
}
dec->parse_entropy_len = 0;
frame_len += eseglen;
GST_DEBUG ("entropy segment length=%u => frame_len=%u", eseglen,
frame_len);
}
if (resync) {
/* check if we will still be in sync if we interpret
* this as a sync point and skip this frame */
noffset = offset + frame_len + 2;
noffset = gst_adapter_masked_scan_uint32 (adapter, 0x0000ff00, 0x0000ff00,
noffset, 4);
if (noffset < 0) {
/* ignore and continue resyncing until we hit the end
* of our data or find a sync point that looks okay */
offset++;
continue;
}
GST_DEBUG ("found sync at 0x%x", offset + 2);
}
/* Add current data to output buffer */
toadd += frame_len + 2;
offset += frame_len + 2;
}
need_more_data:
if (toadd)
gst_video_decoder_add_to_frame (bdec, toadd);
return GST_VIDEO_DECODER_FLOW_NEED_DATA;
have_full_frame:
if (toadd)
gst_video_decoder_add_to_frame (bdec, toadd);
return gst_video_decoder_have_frame (bdec);
drop_frame:
gst_adapter_flush (adapter, size);
return GST_FLOW_OK;
}