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gst/rtp/gstrtph263depay.*: Fix h263 depayloader so that ANY h263 decoder can handle the outgoing stream.

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Original commit message from CVS:
* gst/rtp/gstrtph263depay.c: (gst_rtp_h263_depay_init),
(gst_rtp_h263_depay_process):
* gst/rtp/gstrtph263depay.h:
Fix h263 depayloader so that ANY h263 decoder can handle the outgoing
stream.
This commit is contained in:
Edward Hervey 2007-11-27 00:01:41 +00:00
parent 28be655e11
commit a7b160d8b1
3 changed files with 106 additions and 33 deletions
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8
ChangeLog
View file

@ -1,3 +1,11 @@
2007-11-27 Edward Hervey <bilboed@bilboed.com>
* gst/rtp/gstrtph263depay.c: (gst_rtp_h263_depay_init),
(gst_rtp_h263_depay_process):
* gst/rtp/gstrtph263depay.h:
Fix h263 depayloader so that ANY h263 decoder can handle the outgoing
stream.
2007-11-26 Wim Taymans <wim.taymans@gmail.com>
Based on Path by: Jayarama S. Santana <sundarsantana at gmail dot com>

129
gst/rtp/gstrtph263depay.c
View file

@ -5,6 +5,7 @@
* @author: Philippe Kalaf <philippe.kalaf@collabora.co.uk>
*
* Copyright (C) <2005> Wim Taymans <wim@fluendo.com>
* <2007> Edward Hervey <bilboed@bilboed.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -36,7 +37,8 @@ static const GstElementDetails gst_rtp_h263depay_details =
GST_ELEMENT_DETAILS ("RTP H263 packet depayloader",
"Codec/Depayloader/Network",
"Extracts H263 video from RTP packets (RFC 2190)",
"Philippe Kalaf <philippe.kalaf@collabora.co.uk>");
"Philippe Kalaf <philippe.kalaf@collabora.co.uk>, "
"Edward Hervey <bilboed@bilboed.com>");
enum
{
@ -135,6 +137,9 @@ gst_rtp_h263_depay_init (GstRtpH263Depay * rtph263depay,
GstRtpH263DepayClass * klass)
{
rtph263depay->adapter = gst_adapter_new ();
rtph263depay->offset = 0;
rtph263depay->leftover = 0;
}
static void
@ -181,14 +186,22 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
if (!gst_rtp_buffer_validate (buf))
goto bad_packet;
/* flush remaining data on discont */
if (GST_BUFFER_IS_DISCONT (buf)) {
gst_adapter_clear (rtph263depay->adapter);
rtph263depay->offset = 0;
rtph263depay->leftover = 0;
}
{
gint payload_len;
guint8 *payload;
guint32 timestamp;
guint header_len;
guint8 total_offset;
guint SBIT, EBIT;
gboolean F, P, M;
gboolean I = FALSE;
gboolean I;
payload_len = gst_rtp_buffer_get_payload_len (buf);
payload = gst_rtp_buffer_get_payload (buf);
@ -196,9 +209,14 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
M = gst_rtp_buffer_get_marker (buf);
/* Let's see what mode we are using */
F = (payload[0] & 0x01) == 0x01;
P = (payload[0] & 0x02) == 0x02;
F = (payload[0] & 0x80) == 0x80;
P = (payload[0] & 0x40) == 0x40;
/* Bit shifting */
SBIT = (payload[0] & 0x38) >> 3;
EBIT = (payload[0] & 0x07);
/* Figure out header length and I-flag */
if (F == 0) {
/* F == 0 and P == 0 or 1
* mode A */
@ -211,6 +229,7 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
I = (payload[1] & 0x10) == 0x10;
} else if (P == 0) {
/* F == 1 and P == 0
* mode B */
@ -224,6 +243,7 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
* |I|U|S|A| HMV1 | VMV1 | HMV2 | VMV2 |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
I = (payload[4] & 0x80) == 0x80;
} else {
/* F == 1 and P == 1
* mode C */
@ -239,49 +259,92 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
* | RR |DBQ| TRB | TR |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*/
I = (payload[4] & 0x80) == 0x80;
}
#if 0
GST_WARNING ("F/P/M/I : %d/%d/%d/%d", F, P, M, I);
GST_WARNING ("SBIT : %d , EBIT : %d", SBIT, EBIT);
GST_WARNING ("payload_len : %d, header_len : %d , leftover : %d",
payload_len, header_len, rtph263depay->offset);
gst_util_dump_mem (payload, header_len);
#endif
/* skip header */
payload += header_len;
payload_len -= header_len;
timestamp = gst_rtp_buffer_get_timestamp (buf);
total_offset = rtph263depay->offset + SBIT;
if (total_offset) {
int i;
/* shift bits */
if (rtph263depay->offset)
rtph263depay->leftover |= payload[0] << total_offset;
for (i = 0; i < payload_len - 1; i++)
payload[i] =
(payload[i] << total_offset) | (payload[i + 1] >> (8 -
total_offset));
payload[payload_len - 1] = payload[payload_len - 1] << total_offset;
}
if (rtph263depay->offset) {
/* push leftover into the adapter because by now it is a complete byte */
GstBuffer *buf = gst_buffer_new_and_alloc (1);
GST_BUFFER_DATA (buf)[0] = rtph263depay->leftover;
gst_adapter_push (rtph263depay->adapter, buf);
}
/* store current buffer into the adapter */
if (total_offset + EBIT) {
/* push payload_len - 1 */
outbuf = gst_buffer_new_and_alloc (payload_len - 1);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len - 1);
gst_adapter_push (rtph263depay->adapter, outbuf);
/* store last byte as leftover */
rtph263depay->leftover = payload[payload_len - 1];
} else {
outbuf = gst_buffer_new_and_alloc (payload_len);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
gst_adapter_push (rtph263depay->adapter, outbuf);
}
/* Adjust offset */
rtph263depay->offset += EBIT + SBIT;
rtph263depay->offset %= 8;
/* Trim end of the leftover */
if (rtph263depay->offset)
rtph263depay->leftover &= 0xFF << rtph263depay->offset;
/* FIXME at this point, we just drop the header and don't check for any missing
* buffers, proper behaviour is to recreate the appropriate information in the
* bitstream if it has been lost */
if (M) {
/* frame is completed: append to previous, push it out */
guint len, padlen;
/* frame is completed */
guint avail;
guint32 timestamp;
if (rtph263depay->offset) {
/* push in the leftover */
GstBuffer *buf = gst_buffer_new_and_alloc (1);
GST_BUFFER_DATA (buf)[0] = rtph263depay->leftover;
gst_adapter_push (rtph263depay->adapter, buf);
}
avail = gst_adapter_available (rtph263depay->adapter);
len = avail + payload_len;
padlen = (len % 4) + 4;
outbuf = gst_buffer_new_and_alloc (len + padlen);
memset (GST_BUFFER_DATA (outbuf) + len, 0, padlen);
GST_BUFFER_SIZE (outbuf) = len;
/* prepend previous data */
if (avail > 0) {
gst_adapter_copy (rtph263depay->adapter, GST_BUFFER_DATA (outbuf), 0,
avail);
gst_adapter_flush (rtph263depay->adapter, avail);
}
memcpy (GST_BUFFER_DATA (outbuf) + avail, payload, payload_len);
outbuf = gst_adapter_take_buffer (rtph263depay->adapter, avail);
if (I)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
return outbuf;
timestamp = gst_rtp_buffer_get_timestamp (buf);
gst_base_rtp_depayload_push_ts (depayload, timestamp, outbuf);
} else {
/* frame not completed: store in adapter */
outbuf = gst_buffer_new_and_alloc (payload_len);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
gst_adapter_push (rtph263depay->adapter, outbuf);
}
}
return NULL;

2
gst/rtp/gstrtph263depay.h
View file

@ -44,6 +44,8 @@ struct _GstRtpH263Depay
{
GstBaseRTPDepayload depayload;
guint8 offset; /* offset to apply to next payload */
guint8 leftover; /* leftover from previous payload (if offset != 0) */
GstAdapter *adapter;
};