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vc2enc: carry over quantization index across frames as a starting point 

Previously a global average was used. Using the previous quantizer
resulted in a fairly significant speedup as slice size selection settled
down quicker.

Signed-off-by: Rostislav Pehlivanov <atomnuker@gmail.com>
This commit is contained in:
Rostislav Pehlivanov 2016-02-27 18:34:03 +00:00
parent fc1d3cbfdc
commit 0a2adf0f47
1 changed files with 6 additions and 6 deletions
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12
libavcodec/vc2enc.c
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@ -132,7 +132,7 @@ typedef struct VC2EncContext {
int slice_max_bytes;
int slice_min_bytes;
int q_ceil;
int q_start;
int q_avg;
/* Options */
double tolerance;
@ -675,7 +675,7 @@ static int rate_control(AVCodecContext *avctx, void *arg)
const int sx = slice_dat->x;
const int sy = slice_dat->y;
int bits_last = INT_MAX, quant_buf[2] = {-1, -1};
int quant = s->q_start, range = s->q_start/3;
int quant = slice_dat->quant_idx, range = quant/5;
const int top = slice_dat->bits_ceil;
const int bottom = slice_dat->bits_floor;
int bits = count_hq_slice(s, slice_dat->cache, &slice_dat->cached_results,
@ -791,7 +791,7 @@ static int encode_slices(VC2EncContext *s)
for (slice_x = 0; slice_x < s->num_x; slice_x++) {
SliceArgs *args = &enc_args[s->num_x*slice_y + slice_x];
init_put_bits(&args->pb, buf + skip, args->bytes);
s->q_start = (s->q_start + args->quant_idx)/2;
s->q_avg = (s->q_avg + args->quant_idx)/2;
skip += args->bytes;
}
}
@ -839,8 +839,6 @@ static int encode_slices(VC2EncContext *s)
* of levels. The rest of the areas can be thought as the details needed
* to restore the image perfectly to its original size.
*/
static int dwt_plane(AVCodecContext *avctx, void *arg)
{
TransformArgs *transform_dat = arg;
@ -996,7 +994,7 @@ static av_cold int vc2_encode_end(AVCodecContext *avctx)
int i;
VC2EncContext *s = avctx->priv_data;
av_log(avctx, AV_LOG_INFO, "Qavg: %i\n", s->q_start);
av_log(avctx, AV_LOG_INFO, "Qavg: %i\n", s->q_avg);
for (i = 0; i < 3; i++) {
ff_vc2enc_free_transforms(&s->transform_args[i].t);
@ -1031,6 +1029,8 @@ static av_cold int vc2_encode_init(AVCodecContext *avctx)
s->base_vf = -1;
s->strict_compliance = 1;
s->q_avg = 0;
/* Mark unknown as progressive */
s->interlaced = !((avctx->field_order == AV_FIELD_UNKNOWN) ||
(avctx->field_order == AV_FIELD_PROGRESSIVE));