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schrodec: optimize parse logic

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Header will be read each and everytime parse function will be called
which is not necessary since until we have complete data,
we need not parse the header again.

https://bugzilla.gnome.org/show_bug.cgi?id=737984
This commit is contained in:
Vineeth T M 2014-10-09 08:20:15 +05:30 committed by Luis de Bethencourt
parent 39a5c20263
commit b8927d848c
1 changed files with 58 additions and 46 deletions
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104
ext/schroedinger/gstschrodec.c
View file

@ -58,6 +58,10 @@ struct _GstSchroDec
SchroDecoder *decoder;
gboolean seq_header_buffer_seen;
gint next;
gint prev;
gint parse_code;
gboolean header_read;
};
struct _GstSchroDecClass
@ -151,6 +155,7 @@ gst_schro_dec_init (GstSchroDec * schro_dec)
schro_dec->decoder = schro_decoder_new ();
gst_video_decoder_set_packetized (GST_VIDEO_DECODER (schro_dec), FALSE);
schro_dec->header_read = FALSE;
}
static gboolean
@ -163,7 +168,11 @@ gst_schro_dec_start (GstVideoDecoder * dec)
static gboolean
gst_schro_dec_stop (GstVideoDecoder * dec)
{
GstSchroDec *schro_dec;
schro_dec = GST_SCHRO_DEC (dec);
schro_dec->header_read = FALSE;
return TRUE;
}
@ -178,7 +187,7 @@ gst_schro_dec_flush (GstVideoDecoder * dec)
if (schro_dec->decoder)
schro_decoder_reset (schro_dec->decoder);
schro_dec->header_read = FALSE;
return TRUE;
}
@ -278,9 +287,6 @@ gst_schro_dec_parse (GstVideoDecoder * base_video_decoder,
{
GstSchroDec *schro_decoder;
unsigned char header[SCHRO_PARSE_HEADER_SIZE];
int next;
int prev;
int parse_code;
int av, loc;
GST_DEBUG_OBJECT (base_video_decoder, "parse");
@ -295,58 +301,65 @@ gst_schro_dec_parse (GstVideoDecoder * base_video_decoder,
GST_DEBUG ("available %d", av);
/* Check for header */
loc =
gst_adapter_masked_scan_uint32 (adapter, 0xffffffff, 0x42424344, 0,
av - 3);
if (G_UNLIKELY (loc == -1)) {
GST_DEBUG_OBJECT (schro_decoder, "No header");
gst_adapter_flush (adapter, av - 3);
return GST_VIDEO_DECODER_FLOW_NEED_DATA;
if (schro_decoder->header_read == FALSE) {
/* Check for header */
loc =
gst_adapter_masked_scan_uint32 (adapter, 0xffffffff, 0x42424344, 0,
av - (SCHRO_PARSE_HEADER_SIZE - 1));
if (G_UNLIKELY (loc == -1)) {
GST_DEBUG_OBJECT (schro_decoder, "No header");
gst_adapter_flush (adapter, av - (SCHRO_PARSE_HEADER_SIZE - 1));
return GST_VIDEO_DECODER_FLOW_NEED_DATA;
}
/* Skip data until header */
if (loc > 0)
gst_adapter_flush (adapter, loc);
gst_adapter_copy (adapter, header, 0, SCHRO_PARSE_HEADER_SIZE);
schro_decoder->parse_code = header[4];
schro_decoder->next = GST_READ_UINT32_BE (header + 5);
schro_decoder->prev = GST_READ_UINT32_BE (header + 9);
GST_DEBUG ("%08x %02x %08x %08x",
GST_READ_UINT32_BE (header), schro_decoder->parse_code,
schro_decoder->next, schro_decoder->prev);
if (memcmp (header, "BBCD", 4) != 0 || (schro_decoder->next & 0xf0000000)
|| (schro_decoder->prev & 0xf0000000)) {
gst_adapter_flush (adapter, 1);
return GST_VIDEO_DECODER_FLOW_NEED_DATA;
}
schro_decoder->header_read = TRUE;
}
/* Skip data until header */
if (loc > 0)
gst_adapter_flush (adapter, loc);
gst_adapter_copy (adapter, header, 0, SCHRO_PARSE_HEADER_SIZE);
parse_code = header[4];
next = GST_READ_UINT32_BE (header + 5);
prev = GST_READ_UINT32_BE (header + 9);
GST_DEBUG ("%08x %02x %08x %08x",
GST_READ_UINT32_BE (header), parse_code, next, prev);
if (memcmp (header, "BBCD", 4) != 0 ||
(next & 0xf0000000) || (prev & 0xf0000000)) {
gst_adapter_flush (adapter, 1);
return GST_VIDEO_DECODER_FLOW_NEED_DATA;
}
if (SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE (parse_code)) {
if (next != 0 && next != SCHRO_PARSE_HEADER_SIZE) {
GST_WARNING ("next is not 0 or 13 in EOS packet (%d)", next);
if (SCHRO_PARSE_CODE_IS_END_OF_SEQUENCE (schro_decoder->parse_code)) {
if (schro_decoder->next != 0
&& schro_decoder->next != SCHRO_PARSE_HEADER_SIZE) {
GST_WARNING ("next is not 0 or 13 in EOS packet (%d)",
schro_decoder->next);
}
gst_video_decoder_add_to_frame (base_video_decoder,
SCHRO_PARSE_HEADER_SIZE);
SCHRO_DEBUG ("eos");
schro_decoder->header_read = FALSE;
return gst_video_decoder_have_frame (base_video_decoder);
}
if (gst_adapter_available (adapter) < next) {
if (gst_adapter_available (adapter) < schro_decoder->next) {
return GST_VIDEO_DECODER_FLOW_NEED_DATA;
}
} else
schro_decoder->header_read = FALSE;
if (SCHRO_PARSE_CODE_IS_SEQ_HEADER (parse_code)) {
if (SCHRO_PARSE_CODE_IS_SEQ_HEADER (schro_decoder->parse_code)) {
guint8 *data;
data = g_malloc (next);
data = g_malloc (schro_decoder->next);
gst_adapter_copy (adapter, data, 0, next);
parse_sequence_header (schro_decoder, data, next);
gst_adapter_copy (adapter, data, 0, schro_decoder->next);
parse_sequence_header (schro_decoder, data, schro_decoder->next);
GST_VIDEO_CODEC_FRAME_SET_SYNC_POINT (frame);
@ -395,11 +408,11 @@ gst_schro_dec_parse (GstVideoDecoder * base_video_decoder,
}
if (!schro_decoder->seq_header_buffer_seen) {
gst_adapter_flush (adapter, next);
gst_adapter_flush (adapter, schro_decoder->next);
return GST_FLOW_OK;
}
if (SCHRO_PARSE_CODE_IS_PICTURE (parse_code)) {
if (SCHRO_PARSE_CODE_IS_PICTURE (schro_decoder->parse_code)) {
guint8 tmp[4];
gst_adapter_copy (adapter, tmp, SCHRO_PARSE_HEADER_SIZE, 4);
@ -408,11 +421,10 @@ gst_schro_dec_parse (GstVideoDecoder * base_video_decoder,
* do anything with presentation_frame_number */
frame->presentation_frame_number = GST_READ_UINT32_BE (tmp);
gst_video_decoder_add_to_frame (base_video_decoder, next);
gst_video_decoder_add_to_frame (base_video_decoder, schro_decoder->next);
return gst_video_decoder_have_frame (base_video_decoder);
} else {
gst_video_decoder_add_to_frame (base_video_decoder, next);
gst_video_decoder_add_to_frame (base_video_decoder, schro_decoder->next);
}
return GST_FLOW_OK;