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Code Issues Releases Activity

avcodec/fitsenc: Avoid copying packet data, allow user-supplied buffers

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When the packet size is known in advance like here, one can avoid
an intermediate buffer for the packet data by using
ff_get_encode_buffer() and also set AV_CODEC_CAP_DR1 at the same time.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-04-25 01:43:26 +02:00
parent ae7a7dc458
commit 6e2fe9958a
1 changed files with 4 additions and 5 deletions
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9
libavcodec/fitsenc.c
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@ -32,13 +32,14 @@
#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "encode.h"
#include "internal.h"
static int fits_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *pict, int *got_packet)
{
AVFrame * const p = (AVFrame *)pict;
uint8_t *bytestream, *bytestream_start, *ptr;
uint8_t *bytestream, *ptr;
const uint16_t flip = (1 << 15);
uint64_t data_size = 0, padded_data_size = 0;
int ret, bitpix, naxis3 = 1, i, j, k, bytes_left;
@ -80,10 +81,9 @@ static int fits_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
data_size = (bitpix >> 3) * avctx->height * avctx->width * naxis3;
padded_data_size = ((data_size + 2879) / 2880 ) * 2880;
if ((ret = ff_alloc_packet2(avctx, pkt, padded_data_size, 0)) < 0)
if ((ret = ff_get_encode_buffer(avctx, pkt, padded_data_size, 0)) < 0)
return ret;
bytestream_start =
bytestream = pkt->data;
for (k = 0; k < naxis3; k++) {
@ -104,9 +104,7 @@ static int fits_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
bytes_left = padded_data_size - data_size;
memset(bytestream, 0, bytes_left);
bytestream += bytes_left;
pkt->size = bytestream - bytestream_start;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
@ -118,6 +116,7 @@ const AVCodec ff_fits_encoder = {
.long_name = NULL_IF_CONFIG_SMALL("Flexible Image Transport System"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_FITS,
.capabilities = AV_CODEC_CAP_DR1,
.encode2 = fits_encode_frame,
.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_GBRAP16BE,
AV_PIX_FMT_GBRP16BE,