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[FFmpeg-devel,26/39] avcodec/dvenc: Avoid copying packet data, allow user-supplied buffers

Message ID HE1PR0301MB21541DBB0061629B4BC536298F299@HE1PR0301MB2154.eurprd03.prod.outlook.com
State Accepted
Commit 835d8b7401466c2c22d4f439c3c331eb949d793e
Headers show
Series [FFmpeg-devel,01/39] avcodec/audiotoolboxenc: Remove AV_CODEC_CAP_DR1 | expand

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Commit Message

Andreas Rheinhardt May 21, 2021, 9:17 a.m. UTC
When the packet size is known in advance like here, one can avoid
an intermediate buffer for the packet data; this also makes it easy
to allow user-supplied buffers. Only one thing needed to be changed:
The earlier code relied on the buffer having been initially zeroed
by av_fast_padded_malloc(), so one now needs to zero the packet at
first.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/dvenc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Comments

James Almer May 21, 2021, 1:06 p.m. UTC | #1
On 5/21/2021 6:17 AM, Andreas Rheinhardt wrote:
> When the packet size is known in advance like here, one can avoid
> an intermediate buffer for the packet data; this also makes it easy
> to allow user-supplied buffers. Only one thing needed to be changed:
> The earlier code relied on the buffer having been initially zeroed
> by av_fast_padded_malloc(), so one now needs to zero the packet at
> first.
> 
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>   libavcodec/dvenc.c | 8 ++++++--
>   1 file changed, 6 insertions(+), 2 deletions(-)

Patches 1 to 26 LGTM (After addressing the comments i made in two of them).
diff mbox series

Patch

diff --git a/libavcodec/dvenc.c b/libavcodec/dvenc.c
index 393c8b34e9..a464e3ed87 100644
--- a/libavcodec/dvenc.c
+++ b/libavcodec/dvenc.c
@@ -39,6 +39,7 @@ 
 #include "dv.h"
 #include "dv_profile_internal.h"
 #include "dv_tablegen.h"
+#include "encode.h"
 #include "fdctdsp.h"
 #include "internal.h"
 #include "mathops.h"
@@ -1170,8 +1171,10 @@  static int dvvideo_encode_frame(AVCodecContext *c, AVPacket *pkt,
     DVVideoContext *s = c->priv_data;
     int ret;
 
-    if ((ret = ff_alloc_packet2(c, pkt, s->sys->frame_size, 0)) < 0)
+    if ((ret = ff_get_encode_buffer(c, pkt, s->sys->frame_size, 0)) < 0)
         return ret;
+    /* Fixme: Only zero the part that is not overwritten later. */
+    memset(pkt->data, 0, pkt->size);
 
     c->pix_fmt                = s->sys->pix_fmt;
     s->frame                  = frame;
@@ -1209,10 +1212,11 @@  const AVCodec ff_dvvideo_encoder = {
     .long_name      = NULL_IF_CONFIG_SMALL("DV (Digital Video)"),
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = AV_CODEC_ID_DVVIDEO,
+    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS |
+                      AV_CODEC_CAP_SLICE_THREADS,
     .priv_data_size = sizeof(DVVideoContext),
     .init           = dvvideo_encode_init,
     .encode2        = dvvideo_encode_frame,
-    .capabilities   = AV_CODEC_CAP_SLICE_THREADS | AV_CODEC_CAP_FRAME_THREADS,
     .pix_fmts       = (const enum AVPixelFormat[]) {
         AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV422P,
         AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE