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audio-converter: ensure correct alignment of samples

Browse source 
Make sure that the data we allocate for our temporary buffers is
properly aligned.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=760938
This commit is contained in:
Wim Taymans 2016-01-21 16:08:46 +01:00
parent c99caa6b37
commit 3674742957
1 changed files with 14 additions and 12 deletions
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26
gst-libs/gst/audio/audio-converter.c
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@ -161,7 +161,7 @@ struct _AudioChain
gpointer alloc_data;
gpointer *tmp;
gsize tmpsize;
gsize allocated_samples;
gpointer *samples;
gsize num_samples;
@ -365,28 +365,30 @@ get_output_samples (AudioChain * chain, gsize num_samples, gpointer user_data)
return convert->out_data;
}
#define MEM_ALIGN(m,a) ((gint8 *)((guintptr)((gint8 *)(m) + ((a)-1)) & ~((a)-1)))
#define ALIGN 16
static gpointer *
get_temp_samples (AudioChain * chain, gsize num_samples, gpointer user_data)
{
gsize needed;
/* first part contains the pointers, second part the data */
needed = (num_samples * chain->stride + sizeof (gpointer)) * chain->blocks;
if (needed > chain->tmpsize) {
if (num_samples > chain->allocated_samples) {
gint i;
guint8 *s;
gint8 *s;
gsize stride = GST_ROUND_UP_N (num_samples * chain->stride, ALIGN);
/* first part contains the pointers, second part the data, add some extra bytes
* for alignement */
gsize needed = (stride + sizeof (gpointer)) * chain->blocks + ALIGN;
GST_DEBUG ("alloc samples %" G_GSIZE_FORMAT, needed);
chain->tmp = g_realloc (chain->tmp, needed);
chain->tmpsize = needed;
chain->allocated_samples = num_samples;
/* jump to the data */
s = (guint8 *) & chain->tmp[chain->blocks];
/* pointer to the data, make sure it's 16 bytes aligned */
s = MEM_ALIGN (&chain->tmp[chain->blocks], ALIGN);
/* set up the pointers */
for (i = 0; i < chain->blocks; i++)
chain->tmp[i] = s + (i * num_samples * chain->stride);
chain->tmp[i] = s + i * stride;
}
GST_LOG ("temp samples %p %" G_GSIZE_FORMAT, chain->tmp, num_samples);