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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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38
ext/openexr/gstopenexrdec.cpp
View file

@ -190,32 +190,38 @@ gst_openexr_dec_parse (GstVideoDecoder * decoder,
GstVideoCodecFrame * frame, GstAdapter * adapter, gboolean at_eos) GstVideoCodecFrame * frame, GstAdapter * adapter, gboolean at_eos)
{ {
guint8 data[8]; guint8 data[8];
gsize size; gsize size, parsed_size;
guint32 magic, flags; guint32 magic, flags;
gssize offset; gssize offset;
size = gst_adapter_available (adapter); 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, GST_DEBUG_OBJECT (decoder, "Parsing OpenEXR image data %" G_GSIZE_FORMAT,
size); size);
if (size < 8) if (parsed_size == 0 && size < 8)
goto need_more_data; goto need_more_data;
gst_adapter_copy (adapter, data, 0, 8); /* 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); magic = GST_READ_UINT32_LE (data);
flags = GST_READ_UINT32_LE (data + 4); flags = GST_READ_UINT32_LE (data + 4);
if (magic != 0x01312f76 || ((flags & 0xff) != 1 && (flags & 0xff) != 2) || ((flags & 0x200) && (flags & 0x1800))) { if (magic != 0x01312f76 || ((flags & 0xff) != 1 && (flags & 0xff) != 2) || ((flags & 0x200) && (flags & 0x1800))) {
offset = gst_adapter_masked_scan_uint32_peek (adapter, 0xffffffff, 0x762f3101, 0, size, NULL); offset = gst_adapter_masked_scan_uint32_peek (adapter, 0xffffffff, 0x762f3101, 0, size, NULL);
if (offset == -1) { if (offset == -1) {
gst_adapter_flush (adapter, size - 4); gst_adapter_flush (adapter, size - 4);
goto need_more_data;
}
/* come back into this function after flushing some data */
gst_adapter_flush (adapter, offset);
goto need_more_data; goto need_more_data;
} }
} else {
/* come back into this function after flushing some data */
gst_adapter_flush (adapter, offset);
goto need_more_data;
} }
/* valid header, now let's try to find the next one unless we're EOS */ /* valid header, now let's try to find the next one unless we're EOS */
@ -224,8 +230,10 @@ gst_openexr_dec_parse (GstVideoDecoder * decoder,
while (!found) { while (!found) {
offset = gst_adapter_masked_scan_uint32_peek (adapter, 0xffffffff, 0x762f3101, 8, size - 8 - 4, NULL); 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; goto need_more_data;
}
gst_adapter_copy (adapter, data, offset, 8); gst_adapter_copy (adapter, data, offset, 8);
magic = GST_READ_UINT32_LE (data); magic = GST_READ_UINT32_LE (data);
@ -236,7 +244,7 @@ gst_openexr_dec_parse (GstVideoDecoder * decoder,
size = offset; 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); gst_video_decoder_add_to_frame (decoder, size);