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avcodec/aliaspixenc: Remove redundant counter 

Improves performance by 33.8% for BGR24 and by 26.4% for GRAY8.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2021-10-06 13:57:42 +02:00
parent 66f4685910
commit 5e1b5b52fe
1 changed files with 8 additions and 8 deletions
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16
libavcodec/aliaspixenc.c
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@ -31,8 +31,8 @@
static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *frame, int *got_packet)
{
int width, height, bits_pixel, i, j, length, ret;
uint8_t *in_buf, *buf;
int width, height, bits_pixel, length, ret;
uint8_t *buf;
width = avctx->width;
height = avctx->height;
@ -66,15 +66,16 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
bytestream_put_be32(&buf, 0); /* X, Y offset */
bytestream_put_be16(&buf, bits_pixel);
for (j = 0; j < height; j++) {
in_buf = frame->data[0] + frame->linesize[0] * j;
for (i = 0; i < width; ) {
for (int j = 0, bytes_pixel = bits_pixel >> 3; j < height; j++) {
const uint8_t *in_buf = frame->data[0] + frame->linesize[0] * j;
const uint8_t *const line_end = in_buf + bytes_pixel * width;
while (in_buf < line_end) {
int count = 0;
int pixel;
if (avctx->pix_fmt == AV_PIX_FMT_GRAY8) {
pixel = *in_buf;
while (count < 255 && count + i < width && pixel == *in_buf) {
while (count < 255 && in_buf < line_end && pixel == *in_buf) {
count++;
in_buf++;
}
@ -82,7 +83,7 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
bytestream_put_byte(&buf, pixel);
} else { /* AV_PIX_FMT_BGR24 */
pixel = AV_RB24(in_buf);
while (count < 255 && count + i < width &&
while (count < 255 && in_buf < line_end &&
pixel == AV_RB24(in_buf)) {
count++;
in_buf += 3;
@ -90,7 +91,6 @@ static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
bytestream_put_byte(&buf, count);
bytestream_put_be24(&buf, pixel);
}
i += count;
}
}