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jpegdec: use libjpeg scatter-gather operation to avoid data copying

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Fixes #583047 (more).
This commit is contained in:
Mark Nauwelaerts 2010-05-31 12:45:01 +02:00
parent 58fbcf01e5
commit a391bf52cc
2 changed files with 29 additions and 19 deletions
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46
ext/jpeg/gstjpegdec.c
View file

@ -201,20 +201,23 @@ gst_jpeg_dec_class_init (GstJpegDecClass * klass)
static boolean
gst_jpeg_dec_fill_input_buffer (j_decompress_ptr cinfo)
{
/*
struct GstJpegDecSourceMgr *src_mgr;
GstJpegDec *dec;
guint av;
src_mgr = (struct GstJpegDecSourceMgr*) &cinfo->src;
dec = GST_JPEG_DEC (src_mgr->dec);
*/
GST_DEBUG_OBJECT (CINFO_GET_JPEGDEC (cinfo), "fill_input_buffer");
/*
g_return_val_if_fail (dec != NULL, TRUE);
dec = CINFO_GET_JPEGDEC (cinfo);
g_return_val_if_fail (dec != NULL, FALSE);
av = gst_adapter_available_fast (dec->adapter);
GST_DEBUG_OBJECT (dec, "fill_input_buffer: fast av=%u, remaining=%u", av,
dec->rem_img_len);
if (dec->rem_img_len < av)
av = dec->rem_img_len;
dec->rem_img_len -= av;
cinfo->src->next_input_byte = gst_adapter_take (dec->adapter, av);
cinfo->src->bytes_in_buffer = av;
src_mgr->pub.next_input_byte = GST_BUFFER_DATA (dec->tempbuf);
src_mgr->pub.bytes_in_buffer = GST_BUFFER_SIZE (dec->tempbuf);
*/
return TRUE;
}
@ -1113,7 +1116,10 @@ gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buf)
GstFlowReturn ret = GST_FLOW_OK;
GstJpegDec *dec;
GstBuffer *outbuf = NULL;
guchar *data, *outdata;
#ifndef GST_DISABLE_GST_DEBUG
guchar *data;
#endif
guchar *outdata;
guchar *base[3], *last[3];
guint img_len, outsize;
gint width, height;
@ -1175,11 +1181,16 @@ gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buf)
if (dec->packetized && !gst_jpeg_dec_do_qos (dec, timestamp))
goto skip_decoding;
data = (guint8 *) gst_adapter_peek (dec->adapter, img_len);
GST_LOG_OBJECT (dec, "image size = %u", img_len);
dec->jsrc.pub.next_input_byte = data;
dec->jsrc.pub.bytes_in_buffer = img_len;
#ifndef GST_DISABLE_GST_DEBUG
data = (guint8 *) gst_adapter_peek (dec->adapter, 4);
GST_LOG_OBJECT (dec, "reading header %02x %02x %02x %02x", data[0], data[1],
data[2], data[3]);
#endif
dec->rem_img_len = img_len;
gst_jpeg_dec_fill_input_buffer (&dec->cinfo);
if (setjmp (dec->jerr.setjmp_buffer)) {
code = dec->jerr.pub.msg_code;
@ -1191,9 +1202,6 @@ gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buf)
goto decode_error;
}
GST_LOG_OBJECT (dec, "reading header %02x %02x %02x %02x", data[0], data[1],
data[2], data[3]);
/* read header */
hdr_ok = jpeg_read_header (&dec->cinfo, TRUE);
if (G_UNLIKELY (hdr_ok != JPEG_HEADER_OK)) {
@ -1394,7 +1402,7 @@ gst_jpeg_dec_chain (GstPad * pad, GstBuffer * buf)
skip_decoding:
done:
gst_adapter_flush (dec->adapter, img_len);
gst_adapter_flush (dec->adapter, dec->rem_img_len);
exit:

2
ext/jpeg/gstjpegdec.h
View file

@ -119,6 +119,8 @@ struct _GstJpegDec {
/* arrays for indirect decoding */
gboolean idr_width_allocated;
guchar *idr_y[16],*idr_u[16],*idr_v[16];
/* current (parsed) image size */
guint rem_img_len;
};
struct _GstJpegDecClass {