[FFmpeg-devel] [PATCH v5] avcodec/v210dec: add the frame and slice threading support
lance.lmwang at gmail.com
lance.lmwang at gmail.com
Sat Oct 12 13:58:21 EEST 2019
From: Limin Wang <lance.lmwang at gmail.com>
The multithread is avoid one core cpu is full with other filter like scale etc.
About the performance, the gain is very small, below is my testing for
performance.
In order to avoid the disk bottleneck, I'll use stream_loop mode for 10 frame
only.
./ffmpeg -y -i ~/Movies/4k_Rec709_ProResHQ.mov -c:v v210 -f rawvideo -frames 10
~/Movies/1.v210
master:
./ffmpeg -threads 1 -s 4096x3072 -stream_loop 100 -i ~/Movies/1.v210 -benchmark
-f null -
frame= 1010 fps= 42 q=-0.0 Lsize=N/A time=00:00:40.40 bitrate=N/A speed=1.69x
video:529kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown
bench: utime=10.082s stime=13.784s rtime=23.889s
bench: maxrss=147836928kB
patch applied:
./ffmpeg -threads 4 -thread_type frame+slice -s 4096x3072 -stream_loop 100 -i
~/Movies/1.v210 -benchmark -f null -
frame= 1010 fps= 55 q=-0.0 Lsize=N/A time=00:00:40.40 bitrate=N/A speed=2.22x
video:529kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing
overhead: unknown
bench: utime=11.407s stime=17.258s rtime=18.279s
bench: maxrss=442884096kB
Signed-off-by: Limin Wang <lance.lmwang at gmail.com>
---
libavcodec/v210dec.c | 132 +++++++++++++++++++++++++++----------------
libavcodec/v210dec.h | 1 +
2 files changed, 85 insertions(+), 48 deletions(-)
diff --git a/libavcodec/v210dec.c b/libavcodec/v210dec.c
index 5a33d8c089..c3ef8051e6 100644
--- a/libavcodec/v210dec.c
+++ b/libavcodec/v210dec.c
@@ -28,6 +28,7 @@
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/intreadwrite.h"
+#include "thread.h"
#define READ_PIXELS(a, b, c) \
do { \
@@ -37,6 +38,12 @@
*c++ = (val >> 20) & 0x3FF; \
} while (0)
+typedef struct ThreadData {
+ AVFrame *frame;
+ uint8_t *buf;
+ int stride;
+} ThreadData;
+
static void v210_planar_unpack_c(const uint32_t *src, uint16_t *y, uint16_t *u, uint16_t *v, int width)
{
uint32_t val;
@@ -64,21 +71,87 @@ static av_cold int decode_init(AVCodecContext *avctx)
avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
avctx->bits_per_raw_sample = 10;
+ s->thread_count = av_clip(avctx->thread_count, 1, avctx->height/4);
s->aligned_input = 0;
ff_v210dec_init(s);
return 0;
}
+static int v210_decode_slice(AVCodecContext *avctx, void *arg, int jobnr, int threadnr)
+{
+ V210DecContext *s = avctx->priv_data;
+ int h, w;
+ ThreadData *td = arg;
+ AVFrame *frame = td->frame;
+ int stride = td->stride;
+ int slice_h = avctx->height / s->thread_count;
+ int slice_m = avctx->height % s->thread_count;
+ int slice_start = jobnr * slice_h;
+ int slice_end = slice_start + slice_h;
+ const uint8_t *psrc = td->buf + stride * slice_start;
+ uint16_t *y, *u, *v;
+
+ /* add the remaining slice for the last job */
+ if (jobnr == s->thread_count - 1)
+ slice_end += slice_m;
+
+ y = (uint16_t*)frame->data[0] + slice_start * frame->linesize[0] / 2;
+ u = (uint16_t*)frame->data[1] + slice_start * frame->linesize[1] / 2;
+ v = (uint16_t*)frame->data[2] + slice_start * frame->linesize[2] / 2;
+ for (h = slice_start; h < slice_end; h++) {
+ const uint32_t *src = (const uint32_t*)psrc;
+ uint32_t val;
+
+ w = (avctx->width / 12) * 12;
+ s->unpack_frame(src, y, u, v, w);
+
+ y += w;
+ u += w >> 1;
+ v += w >> 1;
+ src += (w << 1) / 3;
+
+ if (w < avctx->width - 5) {
+ READ_PIXELS(u, y, v);
+ READ_PIXELS(y, u, y);
+ READ_PIXELS(v, y, u);
+ READ_PIXELS(y, v, y);
+ w += 6;
+ }
+
+ if (w < avctx->width - 1) {
+ READ_PIXELS(u, y, v);
+
+ val = av_le2ne32(*src++);
+ *y++ = val & 0x3FF;
+ if (w < avctx->width - 3) {
+ *u++ = (val >> 10) & 0x3FF;
+ *y++ = (val >> 20) & 0x3FF;
+
+ val = av_le2ne32(*src++);
+ *v++ = val & 0x3FF;
+ *y++ = (val >> 10) & 0x3FF;
+ }
+ }
+
+ psrc += stride;
+ y += frame->linesize[0] / 2 - avctx->width + (avctx->width & 1);
+ u += frame->linesize[1] / 2 - avctx->width / 2;
+ v += frame->linesize[2] / 2 - avctx->width / 2;
+ }
+
+ return 0;
+}
+
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
AVPacket *avpkt)
{
V210DecContext *s = avctx->priv_data;
-
- int h, w, ret, stride, aligned_input;
+ ThreadData td;
+ int ret, stride, aligned_input;
+ ThreadFrame frame = { .f = data };
AVFrame *pic = data;
const uint8_t *psrc = avpkt->data;
- uint16_t *y, *u, *v;
if (s->custom_stride )
stride = s->custom_stride;
@@ -86,6 +159,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
int aligned_width = ((avctx->width + 47) / 48) * 48;
stride = aligned_width * 8 / 3;
}
+ td.stride = stride;
if (avpkt->size < stride * avctx->height) {
if ((((avctx->width + 23) / 24) * 24 * 8) / 3 * avctx->height == avpkt->size) {
@@ -110,55 +184,15 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
ff_v210dec_init(s);
}
- if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
+ if ((ret = ff_thread_get_buffer(avctx, &frame, 0)) < 0)
return ret;
- y = (uint16_t*)pic->data[0];
- u = (uint16_t*)pic->data[1];
- v = (uint16_t*)pic->data[2];
pic->pict_type = AV_PICTURE_TYPE_I;
pic->key_frame = 1;
- for (h = 0; h < avctx->height; h++) {
- const uint32_t *src = (const uint32_t*)psrc;
- uint32_t val;
-
- w = (avctx->width / 12) * 12;
- s->unpack_frame(src, y, u, v, w);
-
- y += w;
- u += w >> 1;
- v += w >> 1;
- src += (w << 1) / 3;
-
- if (w < avctx->width - 5) {
- READ_PIXELS(u, y, v);
- READ_PIXELS(y, u, y);
- READ_PIXELS(v, y, u);
- READ_PIXELS(y, v, y);
- w += 6;
- }
-
- if (w < avctx->width - 1) {
- READ_PIXELS(u, y, v);
-
- val = av_le2ne32(*src++);
- *y++ = val & 0x3FF;
- if (w < avctx->width - 3) {
- *u++ = (val >> 10) & 0x3FF;
- *y++ = (val >> 20) & 0x3FF;
-
- val = av_le2ne32(*src++);
- *v++ = val & 0x3FF;
- *y++ = (val >> 10) & 0x3FF;
- }
- }
-
- psrc += stride;
- y += pic->linesize[0] / 2 - avctx->width + (avctx->width & 1);
- u += pic->linesize[1] / 2 - avctx->width / 2;
- v += pic->linesize[2] / 2 - avctx->width / 2;
- }
+ td.buf = (uint8_t*)psrc;
+ td.frame = pic;
+ avctx->execute2(avctx, v210_decode_slice, &td, NULL, s->thread_count);
if (avctx->field_order > AV_FIELD_PROGRESSIVE) {
/* we have interlaced material flagged in container */
@@ -194,6 +228,8 @@ AVCodec ff_v210_decoder = {
.priv_data_size = sizeof(V210DecContext),
.init = decode_init,
.decode = decode_frame,
- .capabilities = AV_CODEC_CAP_DR1,
+ .capabilities = AV_CODEC_CAP_DR1 |
+ AV_CODEC_CAP_SLICE_THREADS |
+ AV_CODEC_CAP_FRAME_THREADS,
.priv_class = &v210dec_class,
};
diff --git a/libavcodec/v210dec.h b/libavcodec/v210dec.h
index cfdb29da09..662e266315 100644
--- a/libavcodec/v210dec.h
+++ b/libavcodec/v210dec.h
@@ -27,6 +27,7 @@ typedef struct {
AVClass *av_class;
int custom_stride;
int aligned_input;
+ int thread_count;
int stride_warning_shown;
void (*unpack_frame)(const uint32_t *src, uint16_t *y, uint16_t *u, uint16_t *v, int width);
} V210DecContext;
--
2.21.0
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