[FFmpeg-cvslog] avcodec: Add av_fast_padded_malloc().
Janne Grunau
git at videolan.org
Thu Feb 2 02:46:27 CET 2012
ffmpeg | branch: master | Janne Grunau <janne-libav at jannau.net> | Tue Jan 31 15:40:11 2012 +0000| [316fc7443b05f8c8b494443f2dfe590434796902] | committer: Janne Grunau
avcodec: Add av_fast_padded_malloc().
Wrapper around av_fast_malloc() that keeps FF_INPUT_BUFFER_PADDING_SIZE
zero-padded bytes at the end of the used buffer.
Based on a patch by Reimar Döffinger <Reimar.Doeffinger at gmx.de>.
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=316fc7443b05f8c8b494443f2dfe590434796902
---
doc/APIchanges | 5 +++++
libavcodec/avcodec.h | 9 +++++++++
libavcodec/utils.c | 13 +++++++++++++
3 files changed, 27 insertions(+), 0 deletions(-)
diff --git a/doc/APIchanges b/doc/APIchanges
index 0d4cb59..df55c0a 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -13,6 +13,11 @@ libavutil: 2011-04-18
API changes, most recent first:
+2012-02-01 - xxxxxxx - lavc 54.01.0
+ Add av_fast_padded_malloc() as alternative for av_realloc() when aligned
+ memory is required. The buffer will always have FF_INPUT_BUFFER_PADDING_SIZE
+ zero-padded bytes at the end.
+
2012-01-31 - xxxxxxx - lavf 54.01.0
Add avformat_get_riff_video_tags() and avformat_get_riff_audio_tags().
diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index c70eb85..fcbb68a 100644
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -4071,6 +4071,15 @@ void *av_fast_realloc(void *ptr, unsigned int *size, size_t min_size);
void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size);
/**
+ * Allocate a buffer with padding, reusing the given one if large enough.
+ *
+ * Same behaviour av_fast_malloc but the buffer has additional
+ * FF_INPUT_PADDING_SIZE at the end which will always memset to 0.
+ *
+ */
+void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size);
+
+/**
* Copy image src to dst. Wraps av_picture_data_copy() above.
*/
void av_picture_copy(AVPicture *dst, const AVPicture *src,
diff --git a/libavcodec/utils.c b/libavcodec/utils.c
index fa60953..34eff00 100644
--- a/libavcodec/utils.c
+++ b/libavcodec/utils.c
@@ -80,6 +80,19 @@ void av_fast_malloc(void *ptr, unsigned int *size, size_t min_size)
*size= min_size;
}
+void av_fast_padded_malloc(void *ptr, unsigned int *size, size_t min_size)
+{
+ void **p = ptr;
+ if (min_size > SIZE_MAX - FF_INPUT_BUFFER_PADDING_SIZE) {
+ av_freep(p);
+ *size = 0;
+ return;
+ }
+ av_fast_malloc(p, size, min_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (*size)
+ memset((uint8_t *)*p + min_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+}
+
/* encoder management */
static AVCodec *first_avcodec = NULL;
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