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hap: Decode using optimal slices sizes

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Enjoy some cache locality and use less threads.
About 5x speedup (from 60ms to 12ms to decode a 4k frame).

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
This commit is contained in:
Luca Barbato 2015-07-17 03:07:07 +02:00
parent 219b39a71a
commit 977105407c
2 changed files with 27 additions and 8 deletions
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2
libavcodec/hap.h
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@ -46,6 +46,8 @@ typedef struct HapContext {
uint8_t *snappied; /* Buffer interacting with snappy */
size_t max_snappy; /* Maximum compressed size for snappy buffer */
int slice_size; /* Optimal slice size */
/* Pointer to the selected compress or decompress function */
int (*tex_fun)(uint8_t *dst, ptrdiff_t stride, const uint8_t *block);
} HapContext;

33
libavcodec/hapdec.c
View File

@ -137,16 +137,30 @@ static int setup_texture(AVCodecContext *avctx, size_t length)
}
static int decompress_texture_thread(AVCodecContext *avctx, void *arg,
int block_nb, int thread_nb)
int slice, int thread_nb)
{
HapContext *ctx = avctx->priv_data;
AVFrame *frame = arg;
int x = (TEXTURE_BLOCK_W * block_nb) % avctx->coded_width;
int y = TEXTURE_BLOCK_H * (TEXTURE_BLOCK_W * block_nb / avctx->coded_width);
uint8_t *p = frame->data[0] + x * 4 + y * frame->linesize[0];
const uint8_t *d = ctx->tex_data + block_nb * ctx->tex_rat;
const uint8_t *d = ctx->tex_data;
int w_block = avctx->coded_width / TEXTURE_BLOCK_W;
int x, y;
int start_slice, end_slice;
start_slice = slice * ctx->slice_size;
end_slice = FFMIN(start_slice + ctx->slice_size, avctx->coded_height);
start_slice /= TEXTURE_BLOCK_H;
end_slice /= TEXTURE_BLOCK_H;
for (y = start_slice; y < end_slice; y++) {
uint8_t *p = frame->data[0] + y * frame->linesize[0] * TEXTURE_BLOCK_H;
int off = y * w_block;
for (x = 0; x < w_block; x++) {
ctx->tex_fun(p + x * 16, frame->linesize[0],
d + (off + x) * ctx->tex_rat);
}
}
ctx->tex_fun(p, frame->linesize[0], d);
return 0;
}
@ -156,7 +170,10 @@ static int hap_decode(AVCodecContext *avctx, void *data,
HapContext *ctx = avctx->priv_data;
ThreadFrame tframe;
int ret, length;
int blocks = avctx->coded_width * avctx->coded_height / (TEXTURE_BLOCK_W * TEXTURE_BLOCK_H);
int slices = FFMIN(avctx->thread_count,
avctx->coded_height / TEXTURE_BLOCK_H);
ctx->slice_size = avctx->coded_height / slices;
bytestream2_init(&ctx->gbc, avpkt->data, avpkt->size);
@ -180,7 +197,7 @@ static int hap_decode(AVCodecContext *avctx, void *data,
ff_thread_finish_setup(avctx);
/* Use the decompress function on the texture, one block per thread */
avctx->execute2(avctx, decompress_texture_thread, tframe.f, NULL, blocks);
avctx->execute2(avctx, decompress_texture_thread, tframe.f, NULL, slices);
/* Frame is ready to be output */
tframe.f->pict_type = AV_PICTURE_TYPE_I;