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avcodec/xbmenc: xbm Lower memory use 

Two minor memory improvements.

First bug reduces memory needed to about 6/7 the needed amount, which
allows you to host almost 7 pictures in the same memory needed for 6
Second is a recalculation of the total additional memory for headers etc.

size = avctx->height x (linesize * 6 + 1) + (31+32+38+4+1)
Subject: [PATCH 2/3] avcodec/xbmenc: xbm Lower memory use

Small 6/7th size memory reduction.
size = avctx->height x (linesize * 6 + 1) + (31+32+38+4+1)

Signed-off-by: Joe Da Silva <digital@joescat.com>
This commit is contained in:
Jose Da Silva 2021-01-18 21:43:05 -08:00 committed by Paul B Mahol
parent 41b8fd3a16
commit cb70e1921a
1 changed files with 2 additions and 2 deletions
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4
libavcodec/xbmenc.c
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@ -32,7 +32,7 @@ static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
linesize = (avctx->width + 7) / 8;
commas = avctx->height * linesize;
size = avctx->height * (linesize * 7 + 2) + 109;
size = avctx->height * (linesize * 6 + 1) + 106;
if ((ret = ff_alloc_packet2(avctx, pkt, size, 0)) < 0)
return ret;
@ -41,7 +41,7 @@ static int xbm_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
buf += snprintf(buf, 32, "#define image_width %u\n", avctx->width);
buf += snprintf(buf, 33, "#define image_height %u\n", avctx->height);
buf += snprintf(buf, 40, "static unsigned char image_bits[] = {\n");
buf += snprintf(buf, 39, "static unsigned char image_bits[] = {\n");
for (i = 0; i < avctx->height; i++) {
for (j = 0; j < linesize; j++) {
buf += snprintf(buf, 6, " 0x%02X", ff_reverse[*ptr++]);