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mpegvideoparse: Only map input buffer once

Browse source 
Instead of constantly map/unmapping it a bit everywhere, we pass along
to all functions the GstMapInfo.

Makes mpeg video frame parsing 6% faster

https://bugzilla.gnome.org/show_bug.cgi?id=702330
This commit is contained in:
Edward Hervey 2013-07-22 10:46:23 +02:00
parent dfb101e0ed
commit 1db3d40a4b
1 changed files with 29 additions and 44 deletions
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73
gst/videoparsers/gstmpegvideoparse.c
View file

@ -263,12 +263,11 @@ gst_mpegv_parse_stop (GstBaseParse * parse)
}
static gboolean
gst_mpegv_parse_process_config (GstMpegvParse * mpvparse, GstBuffer * buf,
gst_mpegv_parse_process_config (GstMpegvParse * mpvparse, GstMapInfo * info,
guint size)
{
GstMpegVideoPacket packet;
guint8 *data_with_prefix;
GstMapInfo map;
gint i;
if (mpvparse->seq_offset < 4) {
@ -277,9 +276,7 @@ gst_mpegv_parse_process_config (GstMpegvParse * mpvparse, GstBuffer * buf,
return FALSE;
}
gst_buffer_map (buf, &map, GST_MAP_READ);
g_assert (size <= map.size);
packet.data = map.data;
packet.data = info->data;
packet.type = GST_MPEG_VIDEO_PACKET_SEQUENCE;
packet.offset = mpvparse->seq_offset;
packet.size = size - mpvparse->seq_offset;
@ -293,7 +290,6 @@ gst_mpegv_parse_process_config (GstMpegvParse * mpvparse, GstBuffer * buf,
if (mpvparse->config &&
gst_buffer_memcmp (mpvparse->config, 0, data_with_prefix, MIN (size,
11)) == 0) {
gst_buffer_unmap (buf, &map);
return TRUE;
}
@ -302,7 +298,6 @@ gst_mpegv_parse_process_config (GstMpegvParse * mpvparse, GstBuffer * buf,
GST_DEBUG_OBJECT (mpvparse,
"failed to parse config data (size %d) at offset %d",
size, mpvparse->seq_offset);
gst_buffer_unmap (buf, &map);
return FALSE;
}
@ -374,8 +369,6 @@ gst_mpegv_parse_process_config (GstMpegvParse * mpvparse, GstBuffer * buf,
/* trigger src caps update */
mpvparse->update_caps = TRUE;
gst_buffer_unmap (buf, &map);
return TRUE;
}
@ -440,17 +433,14 @@ picture_type_name (guint8 pct)
#endif /* GST_DISABLE_GST_DEBUG */
static void
parse_packet_extension (GstMpegvParse * mpvparse, GstBuffer * buf, guint off)
parse_packet_extension (GstMpegvParse * mpvparse, GstMapInfo * info, guint off)
{
GstMapInfo map;
GstMpegVideoPacket packet;
gst_buffer_map (buf, &map, GST_MAP_READ);
packet.data = map.data;
packet.data = info->data;
packet.type = GST_MPEG_VIDEO_PACKET_EXTENSION;
packet.offset = off;
packet.size = map.size - off;
packet.size = info->size - off;
/* FIXME : WE ARE ASSUMING IT IS A *PICTURE* EXTENSION */
if (gst_mpeg_video_packet_parse_picture_extension (&packet,
@ -469,8 +459,6 @@ parse_packet_extension (GstMpegvParse * mpvparse, GstBuffer * buf, guint off)
}
mpvparse->picext_updated = TRUE;
}
gst_buffer_unmap (buf, &map);
}
/* caller guarantees at least start code in @buf at @off */
@ -478,16 +466,14 @@ parse_packet_extension (GstMpegvParse * mpvparse, GstBuffer * buf, guint off)
* otherwise returns TRUE if code terminates preceding frame */
static gboolean
gst_mpegv_parse_process_sc (GstMpegvParse * mpvparse,
GstBuffer * buf, gint off, guint8 code)
GstMapInfo * info, gint off, GstMpegVideoPacket * packet)
{
gboolean ret = FALSE, packet = TRUE;
gboolean ret = FALSE, checkconfig = TRUE;
g_return_val_if_fail (buf && gst_buffer_get_size (buf) >= 4, FALSE);
GST_LOG_OBJECT (mpvparse, "process startcode %x (%s) offset:%d", packet->type,
picture_start_code_name (packet->type), off);
GST_LOG_OBJECT (mpvparse, "process startcode %x (%s) offset:%d", code,
picture_start_code_name (code), off);
switch (code) {
switch (packet->type) {
case GST_MPEG_VIDEO_PACKET_PICTURE:
GST_LOG_OBJECT (mpvparse, "startcode is PICTURE");
/* picture is aggregated with preceding sequence/gop, if any.
@ -515,49 +501,45 @@ gst_mpegv_parse_process_sc (GstMpegvParse * mpvparse,
break;
case GST_MPEG_VIDEO_PACKET_EXTENSION:
GST_LOG_OBJECT (mpvparse, "startcode is VIDEO PACKET EXTENSION");
parse_packet_extension (mpvparse, buf, off);
parse_packet_extension (mpvparse, info, off);
if (mpvparse->ext_count < G_N_ELEMENTS (mpvparse->ext_offsets))
mpvparse->ext_offsets[mpvparse->ext_count++] = off;
packet = FALSE;
checkconfig = FALSE;
break;
default:
if (GST_MPEG_VIDEO_PACKET_IS_SLICE (code)) {
if (GST_MPEG_VIDEO_PACKET_IS_SLICE (packet->type)) {
mpvparse->slice_count++;
if (mpvparse->slice_offset == 0)
mpvparse->slice_offset = off - 4;
}
packet = FALSE;
checkconfig = FALSE;
break;
}
/* set size to avoid processing config again */
if (mpvparse->seq_offset >= 0 && off != mpvparse->seq_offset &&
!mpvparse->seq_size && packet) {
if (checkconfig && mpvparse->seq_offset >= 0 && off != mpvparse->seq_offset &&
!mpvparse->seq_size) {
/* should always be at start */
g_assert (mpvparse->seq_offset <= 4);
gst_mpegv_parse_process_config (mpvparse, buf, off - mpvparse->seq_offset);
gst_mpegv_parse_process_config (mpvparse, info, off - mpvparse->seq_offset);
mpvparse->seq_size = off - mpvparse->seq_offset;
}
/* extract some picture info if there is any in the frame being terminated */
if (ret && mpvparse->pic_offset >= 0 && mpvparse->pic_offset < off) {
GstMapInfo map;
GstMpegVideoPacket packet;
GstMpegVideoPacket header;
gst_buffer_map (buf, &map, GST_MAP_READ);
packet.data = map.data;
packet.type = GST_MPEG_VIDEO_PACKET_PICTURE;
packet.offset = mpvparse->pic_offset;
packet.size = map.size - mpvparse->pic_offset;
if (gst_mpeg_video_packet_parse_picture_header (&packet, &mpvparse->pichdr))
header.data = info->data;
header.type = GST_MPEG_VIDEO_PACKET_PICTURE;
header.offset = mpvparse->pic_offset;
header.size = info->size - mpvparse->pic_offset;
if (gst_mpeg_video_packet_parse_picture_header (&header, &mpvparse->pichdr))
GST_LOG_OBJECT (mpvparse, "picture_coding_type %d (%s), ending"
"frame of size %d", mpvparse->pichdr.pic_type,
picture_type_name (mpvparse->pichdr.pic_type), off - 4);
else
GST_LOG_OBJECT (mpvparse, "Couldn't parse picture at offset %d",
mpvparse->pic_offset);
gst_buffer_unmap (buf, &map);
}
return ret;
@ -631,7 +613,7 @@ retry:
/* note: initial start code is assumed at offset 0 by subsequent code */
/* examine start code, see if it looks like an initial start code */
if (gst_mpegv_parse_process_sc (mpvparse, buf, 4, packet.type)) {
if (gst_mpegv_parse_process_sc (mpvparse, &map, 4, &packet)) {
/* found sc */
GST_LOG_OBJECT (mpvparse, "valid start code found");
mpvparse->last_sc = 0;
@ -676,7 +658,7 @@ next:
}
} else {
/* decide whether this startcode ends a frame */
ret = gst_mpegv_parse_process_sc (mpvparse, buf, off + 4, packet.type);
ret = gst_mpegv_parse_process_sc (mpvparse, &map, off + 4, &packet);
}
if (!ret)
@ -984,10 +966,13 @@ gst_mpegv_parse_set_caps (GstBaseParse * parse, GstCaps * caps)
if ((value = gst_structure_get_value (s, "codec_data")) != NULL
&& (buf = gst_value_get_buffer (value))) {
GstMapInfo map;
gst_buffer_map (buf, &map, GST_MAP_READ);
/* best possible parse attempt,
* src caps are based on sink caps so it will end up in there
* whether sucessful or not */
gst_mpegv_parse_process_config (mpvparse, buf, gst_buffer_get_size (buf));
gst_mpegv_parse_process_config (mpvparse, &map, gst_buffer_get_size (buf));
gst_buffer_unmap (buf, &map);
gst_mpegv_parse_reset_frame (mpvparse);
}