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openexrdec: Don't start scanning for the header from the start again each time

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This will be incredible slow if the upstream block size is very small. Instead
continue scanning for the header where we previously stopped.

For the standard filesrc block-size this made decoding a file about
3 times faster.

https://bugzilla.gnome.org/show_bug.cgi?id=719890
This commit is contained in:
Sebastian Dröge 2014-01-18 13:56:28 +01:00
parent 1f9c305694
commit 7548d5f7f9
1 changed files with 23 additions and 15 deletions
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16
ext/openexr/gstopenexrdec.cpp
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@ -190,18 +190,22 @@ gst_openexr_dec_parse (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame, GstAdapter * adapter, gboolean at_eos)
{
guint8 data[8];
gsize size;
gsize size, parsed_size;
guint32 magic, flags;
gssize offset;
size = gst_adapter_available (adapter);
parsed_size = gst_video_decoder_get_pending_frame_size (decoder);
GST_DEBUG_OBJECT (decoder, "Parsing OpenEXR image data %" G_GSIZE_FORMAT,
size);
if (size < 8)
if (parsed_size == 0 && size < 8)
goto need_more_data;
/* If we did not parse anything yet, check if the frame starts with the header */
if (parsed_size == 0) {
gst_adapter_copy (adapter, data, 0, 8);
magic = GST_READ_UINT32_LE (data);
@ -217,6 +221,8 @@ gst_openexr_dec_parse (GstVideoDecoder * decoder,
gst_adapter_flush (adapter, offset);
goto need_more_data;
}
} else {
}
/* valid header, now let's try to find the next one unless we're EOS */
if (!at_eos) {
@ -224,8 +230,10 @@ gst_openexr_dec_parse (GstVideoDecoder * decoder,
while (!found) {
offset = gst_adapter_masked_scan_uint32_peek (adapter, 0xffffffff, 0x762f3101, 8, size - 8 - 4, NULL);
if (offset == -1)
if (offset == -1) {
gst_video_decoder_add_to_frame (decoder, size - 7);
goto need_more_data;
}
gst_adapter_copy (adapter, data, offset, 8);
magic = GST_READ_UINT32_LE (data);
@ -236,7 +244,7 @@ gst_openexr_dec_parse (GstVideoDecoder * decoder,
size = offset;
}
GST_DEBUG_OBJECT (decoder, "Have complete image of size %" G_GSSIZE_FORMAT, size);
GST_DEBUG_OBJECT (decoder, "Have complete image of size %" G_GSSIZE_FORMAT, size + parsed_size);
gst_video_decoder_add_to_frame (decoder, size);