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jpegdec: only allocate as much temporary memory as needed for indirect decoding

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When we can't decode directly into the output buffer, make our temp buffers
only as big as needed instead of allocating for the worst case scenario (well,
we still alloc more than strictly needed for some cases, but significantly
less than before).
This commit is contained in:
Tim-Philipp Müller 2009-11-09 11:40:25 +00:00
parent 2270d3359a
commit 26e7fe27d7
2 changed files with 28 additions and 15 deletions
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41
ext/jpeg/gstjpegdec.c
View file

@ -682,6 +682,31 @@ hresamplecpy1 (guint8 * dest, const guint8 * src, guint len)
}
}
static inline gboolean
gst_jpeg_dec_ensure_buffers (GstJpegDec * dec, guint maxrowbytes)
{
gint i;
if (G_LIKELY (dec->idr_width_allocated == maxrowbytes))
return TRUE;
/* FIXME: maybe just alloc one or three blocks altogether? */
for (i = 0; i < 16; i++) {
dec->idr_y[i] = g_try_realloc (dec->idr_y[i], maxrowbytes);
dec->idr_u[i] = g_try_realloc (dec->idr_u[i], maxrowbytes);
dec->idr_v[i] = g_try_realloc (dec->idr_v[i], maxrowbytes);
if (G_UNLIKELY (!dec->idr_y[i] || !dec->idr_u[i] || !dec->idr_v[i])) {
GST_WARNING_OBJECT (dec, "out of memory, i=%d, bytes=%u", i, maxrowbytes);
return FALSE;
}
}
dec->idr_width_allocated = maxrowbytes;
GST_LOG_OBJECT (dec, "allocated temp memory, %u bytes/row", maxrowbytes);
return TRUE;
}
static void
gst_jpeg_dec_decode_indirect (GstJpegDec * dec, guchar * base[3],
guchar * last[3], guint width, guint height, gint r_v, gint r_h)
@ -694,20 +719,8 @@ gst_jpeg_dec_decode_indirect (GstJpegDec * dec, guchar * base[3],
GST_DEBUG_OBJECT (dec,
"unadvantageous width or r_h, taking slow route involving memcpy");
if (G_UNLIKELY (!dec->idr_allocated)) {
gboolean res = TRUE;
for (i = 0; ((i < 16) && res); i++) {
res &= ((dec->idr_y[i] = g_try_malloc (MAX_WIDTH)) != NULL);
res &= ((dec->idr_u[i] = g_try_malloc (MAX_WIDTH)) != NULL);
res &= ((dec->idr_v[i] = g_try_malloc (MAX_WIDTH)) != NULL);
}
if (!res) {
GST_WARNING_OBJECT (dec, "out of memory");
return;
}
dec->idr_allocated = TRUE;
}
if (G_UNLIKELY (!gst_jpeg_dec_ensure_buffers (dec, GST_ROUND_UP_32 (width))))
return;
memcpy (y_rows, dec->idr_y, 16 * sizeof (gpointer));
memcpy (u_rows, dec->idr_u, 16 * sizeof (gpointer));

2
ext/jpeg/gstjpegdec.h
View file

@ -108,7 +108,7 @@ struct _GstJpegDec {
struct GstJpegDecSourceMgr jsrc;
/* arrays for indirect decoding */
gboolean idr_allocated;
gboolean idr_width_allocated;
guchar *idr_y[16],*idr_u[16],*idr_v[16];
};