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gst/rtp/gstrtph263depay.c: Code beautification.

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Original commit message from CVS:
* gst/rtp/gstrtph263depay.c: (gst_rtp_h263_depay_class_init),
(gst_rtp_h263_depay_process):
Code beautification.
Added debug statements.
Don't bit-shift everything, just do operations on last/first byte
instead.
This commit is contained in:
Edward Hervey 2007-11-28 17:48:45 +00:00
parent ae6cf31baf
commit f488ea9acb
2 changed files with 101 additions and 95 deletions
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9
ChangeLog
View file

@ -1,3 +1,12 @@
2007-11-28 Edward Hervey <bilboed@bilboed.com>
* gst/rtp/gstrtph263depay.c: (gst_rtp_h263_depay_class_init),
(gst_rtp_h263_depay_process):
Code beautification.
Added debug statements.
Don't bit-shift everything, just do operations on last/first byte
instead.
2007-11-27 Wim Taymans <wim.taymans@gmail.com>
Patch by: Jayarama S. Santana <sundarsantana at gmail dot com>

115
gst/rtp/gstrtph263depay.c
View file

@ -32,6 +32,9 @@
#include <gst/rtp/gstrtpbuffer.h>
#include "gstrtph263depay.h"
GST_DEBUG_CATEGORY_STATIC (rtph263depay_debug);
#define GST_CAT_DEFAULT (rtph263depay_debug)
/* elementfactory information */
static const GstElementDetails gst_rtp_h263depay_details =
GST_ELEMENT_DETAILS ("RTP H263 packet depayloader",
@ -130,6 +133,9 @@ gst_rtp_h263_depay_class_init (GstRtpH263DepayClass * klass)
gobject_class->get_property = gst_rtp_h263_depay_get_property;
gstelement_class->change_state = gst_rtp_h263_depay_change_state;
GST_DEBUG_CATEGORY_INIT (rtph263depay_debug, "rtph263depay", 0,
"H263 Video RTP Depayloader");
}
static void
@ -180,6 +186,13 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
GstRtpH263Depay *rtph263depay;
GstBuffer *outbuf;
gint payload_len;
guint8 *payload;
guint header_len;
guint SBIT, EBIT;
gboolean F, P, M;
gboolean I;
rtph263depay = GST_RTP_H263_DEPAY (depayload);
@ -188,21 +201,12 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
/* flush remaining data on discont */
if (GST_BUFFER_IS_DISCONT (buf)) {
GST_LOG_OBJECT (depayload, "Discont buffer, flushing adapter");
gst_adapter_clear (rtph263depay->adapter);
rtph263depay->offset = 0;
rtph263depay->leftover = 0;
}
{
gint payload_len;
guint8 *payload;
guint header_len;
guint8 total_offset;
guint SBIT, EBIT;
gboolean F, P, M;
gboolean I;
payload_len = gst_rtp_buffer_get_payload_len (buf);
payload = gst_rtp_buffer_get_payload (buf);
@ -221,6 +225,7 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
/* F == 0 and P == 0 or 1
* mode A */
header_len = GST_RFC2190A_HEADER_LEN;
GST_LOG ("Mode A");
/* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
@ -230,10 +235,12 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
*/
I = (payload[1] & 0x10) == 0x10;
} else if (P == 0) {
} else {
if (P == 0) {
/* F == 1 and P == 0
* mode B */
header_len = GST_RFC2190B_HEADER_LEN;
GST_LOG ("Mode B");
/* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
@ -248,6 +255,7 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
/* F == 1 and P == 1
* mode C */
header_len = GST_RFC2190C_HEADER_LEN;
GST_LOG ("Mode C");
/* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
@ -261,12 +269,13 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
*/
I = (payload[4] & 0x80) == 0x80;
}
}
GST_LOG ("F/P/M/I : %d/%d/%d/%d", F, P, M, I);
GST_LOG ("SBIT : %d , EBIT : %d", SBIT, EBIT);
GST_LOG ("payload_len : %d, header_len : %d , leftover : 0x%x",
payload_len, header_len, rtph263depay->leftover);
#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
@ -274,55 +283,38 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
payload += header_len;
payload_len -= header_len;
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 (SBIT) {
/* take the leftover and merge it at the beginning */
GST_LOG ("payload[0] : 0x%x", payload[0]);
payload[0] &= 0xFF >> SBIT;
GST_LOG ("payload[0] : 0x%x", payload[0]);
payload[0] |= rtph263depay->leftover;
GST_LOG ("payload[0] : 0x%x", payload[0]);
rtph263depay->leftover = 0;
rtph263depay->offset = 0;
}
if (rtph263depay->offset) {
/* push leftover into the adapter because by now it is a complete byte */
GstBuffer *buf = gst_buffer_new_and_alloc (1);
if (!EBIT) {
GstBuffer *tmp = gst_buffer_new_and_alloc (payload_len);
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];
/* Copy the entire buffer */
memcpy (GST_BUFFER_DATA (tmp), payload, payload_len);
gst_adapter_push (rtph263depay->adapter, tmp);
} else {
outbuf = gst_buffer_new_and_alloc (payload_len);
memcpy (GST_BUFFER_DATA (outbuf), payload, payload_len);
gst_adapter_push (rtph263depay->adapter, outbuf);
GstBuffer *tmp = gst_buffer_new_and_alloc (payload_len - 1);
/* Copy the entire buffer except for the last byte */
memcpy (GST_BUFFER_DATA (tmp), payload, payload_len - 1);
gst_adapter_push (rtph263depay->adapter, tmp);
/* Put the last byte into the leftover */
GST_DEBUG ("payload[payload_len - 1] : 0x%x", payload[payload_len - 1]);
GST_DEBUG ("mask : 0x%x", 0xFF << EBIT);
rtph263depay->leftover = (payload[payload_len - 1] >> EBIT) << EBIT;
rtph263depay->offset = 1;
GST_DEBUG ("leftover : 0x%x", rtph263depay->leftover);
}
/* Adjust offset */
rtph263depay->offset += EBIT + SBIT;
rtph263depay->offset %= 8;
/* Trim end of the leftover */
if (rtph263depay->offset)
rtph263depay->leftover &= 0xFF << rtph263depay->offset;
if (M) {
/* frame is completed */
guint avail;
@ -332,6 +324,7 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
/* push in the leftover */
GstBuffer *buf = gst_buffer_new_and_alloc (1);
GST_DEBUG ("Pushing leftover in adapter");
GST_BUFFER_DATA (buf)[0] = rtph263depay->leftover;
gst_adapter_push (rtph263depay->adapter, buf);
}
@ -342,11 +335,15 @@ gst_rtp_h263_depay_process (GstBaseRTPDepayload * depayload, GstBuffer * buf)
if (I)
GST_BUFFER_FLAG_SET (outbuf, GST_BUFFER_FLAG_DELTA_UNIT);
GST_DEBUG ("Pushing out a buffer of %d bytes", avail);
timestamp = gst_rtp_buffer_get_timestamp (buf);
gst_base_rtp_depayload_push_ts (depayload, timestamp, outbuf);
rtph263depay->offset = 0;
rtph263depay->leftover = 0;
}
}
return NULL;
bad_packet: