Commit 6a819ce4 authored by Yunqing Wang's avatar Yunqing Wang
Browse files

Add motion search skipping in first pass

This change added a motion search skipping mechanism similar
to what we did in second pass. For a macroblock that is very
similar to the macroblock at same location on last frame,
we can set its mv to be zero, and skip motion search. This
improves first-pass performance for slide shows and video
conferencing clips with a slight PSNR loss.

Change-Id: Ic73f9ef5604270ddd6d433170091d20361dfe229
parent 6b7cf307
......@@ -387,7 +387,11 @@ void vp8_end_first_pass(VP8_COMP *cpi)
output_stats(cpi, cpi->output_pkt_list, &cpi->twopass.total_stats);
}
static void zz_motion_search( VP8_COMP *cpi, MACROBLOCK * x, YV12_BUFFER_CONFIG * recon_buffer, int * best_motion_err, int recon_yoffset )
static void zz_motion_search( VP8_COMP *cpi, MACROBLOCK * x,
YV12_BUFFER_CONFIG * raw_buffer,
int * raw_motion_err,
YV12_BUFFER_CONFIG * recon_buffer,
int * best_motion_err, int recon_yoffset)
{
MACROBLOCKD * const xd = & x->e_mbd;
BLOCK *b = &x->block[0];
......@@ -395,15 +399,22 @@ static void zz_motion_search( VP8_COMP *cpi, MACROBLOCK * x, YV12_BUFFER_CONFIG
unsigned char *src_ptr = (*(b->base_src) + b->src);
int src_stride = b->src_stride;
unsigned char *raw_ptr;
int raw_stride = raw_buffer->y_stride;
unsigned char *ref_ptr;
int ref_stride = x->e_mbd.pre.y_stride;
// Set up pointers for this macro block raw buffer
raw_ptr = (unsigned char *)(raw_buffer->y_buffer + recon_yoffset
+ d->offset);
vp8_mse16x16 ( src_ptr, src_stride, raw_ptr, raw_stride,
(unsigned int *)(raw_motion_err));
// Set up pointers for this macro block recon buffer
xd->pre.y_buffer = recon_buffer->y_buffer + recon_yoffset;
ref_ptr = (unsigned char *)(xd->pre.y_buffer + d->offset );
vp8_mse16x16 ( src_ptr, src_stride, ref_ptr, ref_stride, (unsigned int *)(best_motion_err));
vp8_mse16x16 ( src_ptr, src_stride, ref_ptr, ref_stride,
(unsigned int *)(best_motion_err));
}
static void first_pass_motion_search(VP8_COMP *cpi, MACROBLOCK *x,
......@@ -595,12 +606,18 @@ void vp8_first_pass(VP8_COMP *cpi)
MV tmp_mv = {0, 0};
int tmp_err;
int motion_error = INT_MAX;
int raw_motion_error = INT_MAX;
// Simple 0,0 motion with no mv overhead
zz_motion_search( cpi, x, lst_yv12, &motion_error, recon_yoffset );
zz_motion_search( cpi, x, cpi->last_frame_unscaled_source,
&raw_motion_error, lst_yv12, &motion_error,
recon_yoffset );
d->bmi.mv.as_mv.row = 0;
d->bmi.mv.as_mv.col = 0;
if (raw_motion_error < cpi->oxcf.encode_breakout)
goto skip_motion_search;
// Test last reference frame using the previous best mv as the
// starting point (best reference) for the search
first_pass_motion_search(cpi, x, &best_ref_mv,
......@@ -648,6 +665,7 @@ void vp8_first_pass(VP8_COMP *cpi)
xd->pre.v_buffer = lst_yv12->v_buffer + recon_uvoffset;
}
skip_motion_search:
/* Intra assumed best */
best_ref_mv.as_int = 0;
......
......@@ -73,6 +73,9 @@ vp8_lookahead_init(unsigned int width,
else if(depth > MAX_LAG_BUFFERS)
depth = MAX_LAG_BUFFERS;
/* Keep last frame in lookahead buffer by increasing depth by 1.*/
depth += 1;
/* Align the buffer dimensions */
width = (width + 15) & ~15;
height = (height + 15) & ~15;
......@@ -110,7 +113,7 @@ vp8_lookahead_push(struct lookahead_ctx *ctx,
int mb_rows = (src->y_height + 15) >> 4;
int mb_cols = (src->y_width + 15) >> 4;
if(ctx->sz + 1 > ctx->max_sz)
if(ctx->sz + 2 > ctx->max_sz)
return 1;
ctx->sz++;
buf = pop(ctx, &ctx->write_idx);
......@@ -177,7 +180,7 @@ vp8_lookahead_pop(struct lookahead_ctx *ctx,
{
struct lookahead_entry* buf = NULL;
if(ctx->sz && (drain || ctx->sz == ctx->max_sz))
if(ctx->sz && (drain || ctx->sz == ctx->max_sz - 1))
{
buf = pop(ctx, &ctx->read_idx);
ctx->sz--;
......@@ -188,18 +191,33 @@ vp8_lookahead_pop(struct lookahead_ctx *ctx,
struct lookahead_entry*
vp8_lookahead_peek(struct lookahead_ctx *ctx,
unsigned int index)
unsigned int index,
int direction)
{
struct lookahead_entry* buf = NULL;
assert(index < ctx->max_sz);
if(index < ctx->sz)
if (direction == PEEK_FORWARD)
{
assert(index < ctx->max_sz - 1);
if(index < ctx->sz)
{
index += ctx->read_idx;
if(index >= ctx->max_sz)
index -= ctx->max_sz;
buf = ctx->buf + index;
}
}
else if (direction == PEEK_BACKWARD)
{
index += ctx->read_idx;
if(index >= ctx->max_sz)
index -= ctx->max_sz;
assert(index == 1);
if(ctx->read_idx == 0)
index = ctx->max_sz - 1;
else
index = ctx->read_idx - index;
buf = ctx->buf + index;
}
return buf;
}
......
......@@ -82,6 +82,8 @@ vp8_lookahead_pop(struct lookahead_ctx *ctx,
int drain);
#define PEEK_FORWARD 1
#define PEEK_BACKWARD -1
/**\brief Get a future source buffer to encode
*
* \param[in] ctx Pointer to the lookahead context
......@@ -92,7 +94,8 @@ vp8_lookahead_pop(struct lookahead_ctx *ctx,
*/
struct lookahead_entry*
vp8_lookahead_peek(struct lookahead_ctx *ctx,
unsigned int index);
unsigned int index,
int direction);
/**\brief Get the number of frames currently in the lookahead queue
......
......@@ -1106,10 +1106,6 @@ void vp8_alloc_compressor_data(VP8_COMP *cpi)
width, height, VP8BORDERINPIXELS))
vpx_internal_error(&cpi->common.error, VPX_CODEC_MEM_ERROR,
"Failed to allocate scaled source buffer");
vpx_free(cpi->tok);
{
#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING
unsigned int tokens = 8 * 24 * 16; /* one MB for each thread */
......@@ -2934,7 +2930,6 @@ static void Pass1Encode(VP8_COMP *cpi, unsigned long *size, unsigned char *dest,
(void) frame_flags;
vp8_set_quantizer(cpi, 26);
scale_and_extend_source(cpi->un_scaled_source, cpi);
vp8_first_pass(cpi);
}
#endif
......@@ -4721,7 +4716,8 @@ int vp8_get_compressed_data(VP8_COMP *cpi, unsigned int *frame_flags, unsigned l
cpi->source_alt_ref_pending)
{
if ((cpi->source = vp8_lookahead_peek(cpi->lookahead,
cpi->frames_till_gf_update_due)))
cpi->frames_till_gf_update_due,
PEEK_FORWARD)))
{
cpi->alt_ref_source = cpi->source;
if (cpi->oxcf.arnr_max_frames > 0)
......@@ -4743,6 +4739,15 @@ int vp8_get_compressed_data(VP8_COMP *cpi, unsigned int *frame_flags, unsigned l
if (!cpi->source)
{
/* Read last frame source if we are encoding first pass. */
if (cpi->pass == 1 && cm->current_video_frame > 0)
{
if((cpi->last_source = vp8_lookahead_peek(cpi->lookahead, 1,
PEEK_BACKWARD)) == NULL)
return -1;
}
if ((cpi->source = vp8_lookahead_pop(cpi->lookahead, flush)))
{
cm->show_frame = 1;
......@@ -4762,6 +4767,11 @@ int vp8_get_compressed_data(VP8_COMP *cpi, unsigned int *frame_flags, unsigned l
*time_stamp = cpi->source->ts_start;
*time_end = cpi->source->ts_end;
*frame_flags = cpi->source->flags;
if (cpi->pass == 1 && cm->current_video_frame > 0)
{
cpi->last_frame_unscaled_source = &cpi->last_source->img;
}
}
else
{
......
......@@ -316,10 +316,12 @@ typedef struct VP8_COMP
struct lookahead_ctx *lookahead;
struct lookahead_entry *source;
struct lookahead_entry *alt_ref_source;
struct lookahead_entry *last_source;
YV12_BUFFER_CONFIG *Source;
YV12_BUFFER_CONFIG *un_scaled_source;
YV12_BUFFER_CONFIG scaled_source;
YV12_BUFFER_CONFIG *last_frame_unscaled_source;
int source_alt_ref_pending; // frame in src_buffers has been identified to be encoded as an alt ref
int source_alt_ref_active; // an alt ref frame has been encoded and is usable
......
......@@ -525,7 +525,8 @@ void vp8_temporal_filter_prepare_c
{
int which_buffer = start_frame - frame;
struct lookahead_entry* buf = vp8_lookahead_peek(cpi->lookahead,
which_buffer);
which_buffer,
PEEK_FORWARD);
cpi->frames[frames_to_blur-1-frame] = &buf->img;
}
......
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