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ext/mpeg2dec/gstmpeg2dec.*: libmpeg2 requires its output buffers to start at a 16byte aligned address or the altivec ...

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Original commit message from CVS:
Patch by: Sebastian Droege <slomo at ubuntu dot com>
* ext/mpeg2dec/gstmpeg2dec.c: (gst_mpeg2dec_finalize),
(gst_mpeg2dec_alloc_buffer), (init_dummybuf), (handle_slice):
* ext/mpeg2dec/gstmpeg2dec.h:
libmpeg2 requires its output buffers to start at a 16byte aligned
address or the altivec optimizations will explode.
This commit is contained in:
Sebastian Droege 2006-11-03 09:52:12 +00:00 committed by Wim Taymans
parent 2a3809fcc5
commit 520f74867f
3 changed files with 29 additions and 6 deletions
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10
ChangeLog
View file

@ -1,3 +1,13 @@
2006-11-03 Wim Taymans <wim@fluendo.com>
Patch by: Sebastian Droege <slomo at ubuntu dot com>
* ext/mpeg2dec/gstmpeg2dec.c: (gst_mpeg2dec_finalize),
(gst_mpeg2dec_alloc_buffer), (init_dummybuf), (handle_slice):
* ext/mpeg2dec/gstmpeg2dec.h:
libmpeg2 requires its output buffers to start at a 16byte aligned
address or the altivec optimizations will explode.
2006-10-19 Tim-Philipp Müller <tim at centricular dot net>
* ext/dvdread/dvdreadsrc.c: (gst_dvd_read_src_read):

23
ext/mpeg2dec/gstmpeg2dec.c
View file

@ -26,6 +26,10 @@
#include "gstmpeg2dec.h"
/* libmpeg2 needs a 16-byte aligned buffer start address. This rounds the
* given pointer up to a multiply of 16 */
#define ALIGN_16(p) ((void *)(((uintptr_t)(p) + 15) & ~((uintptr_t)15)))
/* mpeg2dec changed a struct name after 0.3.1, here's a workaround */
/* mpeg2dec also only defined MPEG2_RELEASE after 0.3.1
#if MPEG2_RELEASE < MPEG2_VERSION(0,3,2)
@ -258,8 +262,8 @@ gst_mpeg2dec_finalize (GObject * object)
mpeg2dec->decoder = NULL;
}
clear_buffers (mpeg2dec);
g_free (mpeg2dec->dummybuf[0]);
mpeg2dec->dummybuf[0] = NULL;
g_free (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[3] = NULL;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
@ -468,10 +472,15 @@ gst_mpeg2dec_alloc_buffer (GstMpeg2dec * mpeg2dec, gint64 offset,
guint8 *buf[3];
GstFlowReturn ret = GST_FLOW_OK;
ret = gst_mpeg2dec_alloc_sized_buf (mpeg2dec, mpeg2dec->size, &outbuf);
ret = gst_mpeg2dec_alloc_sized_buf (mpeg2dec, mpeg2dec->size + 16, &outbuf);
if (ret != GST_FLOW_OK)
goto no_buffer;
/* 16byte-align the buffer start address. As u_offs and v_offs are
* divideable by 16 without a rest it's only needed for the start */
GST_BUFFER_DATA (outbuf) = ALIGN_16 (GST_BUFFER_DATA (outbuf));
GST_BUFFER_SIZE (outbuf) = mpeg2dec->size;
buf[0] = GST_BUFFER_DATA (outbuf);
buf[1] = buf[0] + mpeg2dec->u_offs;
buf[2] = buf[0] + mpeg2dec->v_offs;
@ -589,9 +598,13 @@ gst_mpeg2dec_negotiate_format (GstMpeg2dec * mpeg2dec)
static void
init_dummybuf (GstMpeg2dec * mpeg2dec)
{
g_free (mpeg2dec->dummybuf[0]);
g_free (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[0] = g_malloc (mpeg2dec->size);
/* 16byte-align the buffer start address. As u_offs and v_offs are
* divideable by 16 without a rest it's only needed for the start.
* dummybuf[3] contains the malloc'ed address for free'ing later */
mpeg2dec->dummybuf[3] = g_malloc0 (mpeg2dec->size + 15);
mpeg2dec->dummybuf[0] = ALIGN_16 (mpeg2dec->dummybuf[3]);
mpeg2dec->dummybuf[1] = mpeg2dec->dummybuf[0] + mpeg2dec->u_offs;
mpeg2dec->dummybuf[2] = mpeg2dec->dummybuf[0] + mpeg2dec->v_offs;
}

2
ext/mpeg2dec/gstmpeg2dec.h
View file

@ -99,7 +99,7 @@ struct _GstMpeg2dec {
gint size;
gint u_offs;
gint v_offs;
guint8 *dummybuf[3];
guint8 *dummybuf[4];
guint64 offset;