[FFmpeg-devel] [PATCH] lavfi: fix avfilter_default_get_audio_buffer() after changes in av_samples_alloc()
Stefano Sabatini
stefasab at gmail.com
Mon Dec 26 00:08:43 CET 2011
av_samples_alloc() behavior changed in bbb46f3ec, resulting in random
data filling the data[] and linesize[] arrays of the returned
AVFilterBufferRef, which was resulting in wrong behavior in case of code
checking on data[i] nullity.
In particular fixes crash in avfilter_filter_samples():
for (i = 0; samplesref->data[i]; i++)
memcpy(link->cur_buf->data[i], samplesref->data[i], samplesref->linesize[0]);
and correctly fills the linesize[] array for planar data.
---
libavfilter/defaults.c | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/libavfilter/defaults.c b/libavfilter/defaults.c
index 1b756a4..5f18168 100644
--- a/libavfilter/defaults.c
+++ b/libavfilter/defaults.c
@@ -19,6 +19,7 @@
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include "libavutil/avassert.h"
#include "libavutil/audioconvert.h"
#include "libavutil/imgutils.h"
#include "libavutil/samplefmt.h"
@@ -84,16 +85,22 @@ AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int per
int nb_samples)
{
AVFilterBufferRef *samplesref = NULL;
- int linesize[8];
- uint8_t *data[8];
- int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
+ int linesize[8] = {0};
+ uint8_t *data[8] = {0};
+ int ch, nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
+
+ /* right now we don't support more than 8 channels */
+ av_assert0(nb_channels <= 8);
/* Calculate total buffer size, round to multiple of 16 to be SIMD friendly */
if (av_samples_alloc(data, linesize,
- nb_channels, nb_samples, link->format,
+ nb_channels, nb_samples,
+ av_get_alt_sample_fmt(link->format, link->planar),
16) < 0)
return NULL;
+ for (ch = 1; link->planar && ch < nb_channels; ch++)
+ linesize[ch] = linesize[0];
samplesref =
avfilter_get_audio_buffer_ref_from_arrays(data, linesize, perms,
nb_samples, link->format,
--
1.7.5.4
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