[Libva] [PATCH 1/4] i965_encoder: consistently represent framerate as a fraction
Mark Thompson
sw at jkqxz.net
Fri Dec 23 01:08:27 UTC 2016
Update references in both H.264 encoders (gen6_mfc and gen9_vdenc).
Signed-off-by: Mark Thompson <sw at jkqxz.net>
---
Changes for the series:
* Derive numerator and denominator from the correct parts of the framerate parameter (see also earlier patch fixing the comment in va.h).
* Make VP8 HRD buffer size derivation the same as other codecs.
* Make the VP9 rate control setup behave more consistently (use window size if needed for VBR, always use HRD parameters if present).
* Fix warnings.
Thanks,
- Mark
src/gen6_mfc_common.c | 11 +++++++----
src/gen9_vdenc.c | 28 ++++++++++++++++------------
src/gen9_vdenc.h | 2 +-
src/i965_encoder.c | 49 ++++++++++++++++++++++++++++++++++---------------
src/i965_encoder.h | 8 +++++++-
5 files changed, 65 insertions(+), 33 deletions(-)
diff --git a/src/gen6_mfc_common.c b/src/gen6_mfc_common.c
index 68d030e..15c0637 100644
--- a/src/gen6_mfc_common.c
+++ b/src/gen6_mfc_common.c
@@ -119,16 +119,19 @@ static void intel_mfc_brc_init(struct encode_state *encode_state,
if (i == 0) {
bitrate = encoder_context->brc.bits_per_second[0];
- framerate = (double)encoder_context->brc.framerate_per_100s[0] / 100.0;
+ framerate = (double)encoder_context->brc.framerate[0].num / (double)encoder_context->brc.framerate[0].den;
} else {
bitrate = (encoder_context->brc.bits_per_second[i] - encoder_context->brc.bits_per_second[i - 1]);
- framerate = (double)(encoder_context->brc.framerate_per_100s[i] - encoder_context->brc.framerate_per_100s[i - 1]) / 100.0;
+ framerate = ((double)encoder_context->brc.framerate[i].num / (double)encoder_context->brc.framerate[i].den) -
+ ((double)encoder_context->brc.framerate[i - 1].num / (double)encoder_context->brc.framerate[i - 1].den);
}
if (i == encoder_context->layer.num_layers - 1)
factor = 1.0;
- else
- factor = (double)encoder_context->brc.framerate_per_100s[i] / encoder_context->brc.framerate_per_100s[encoder_context->layer.num_layers - 1];
+ else {
+ factor = ((double)encoder_context->brc.framerate[i].num / (double)encoder_context->brc.framerate[i].den) /
+ ((double)encoder_context->brc.framerate[i - 1].num / (double)encoder_context->brc.framerate[i - 1].den);
+ }
hrd_factor = (double)bitrate / encoder_context->brc.bits_per_second[encoder_context->layer.num_layers - 1];
diff --git a/src/gen9_vdenc.c b/src/gen9_vdenc.c
index 8009b31..691faec 100644
--- a/src/gen9_vdenc.c
+++ b/src/gen9_vdenc.c
@@ -851,7 +851,7 @@ gen9_vdenc_update_misc_parameters(VADriverContextP ctx,
if (vdenc_context->internal_rate_mode != I965_BRC_CQP &&
encoder_context->brc.need_reset) {
/* So far, vdenc doesn't support temporal layer */
- vdenc_context->frames_per_100s = encoder_context->brc.framerate_per_100s[0];
+ vdenc_context->framerate = encoder_context->brc.framerate[0];
vdenc_context->vbv_buffer_size_in_bit = encoder_context->brc.hrd_buffer_size;
vdenc_context->init_vbv_buffer_fullness_in_bit = encoder_context->brc.hrd_initial_buffer_fullness;
@@ -927,7 +927,8 @@ gen9_vdenc_update_parameters(VADriverContextP ctx,
!vdenc_context->vbv_buffer_size_in_bit ||
!vdenc_context->max_bit_rate ||
!vdenc_context->target_bit_rate ||
- !vdenc_context->frames_per_100s))
+ !vdenc_context->framerate.num ||
+ !vdenc_context->framerate.den))
vdenc_context->brc_enabled = 0;
if (!vdenc_context->brc_enabled) {
@@ -1565,7 +1566,8 @@ gen9_vdenc_get_profile_level_max_frame(VADriverContextP ctx,
tmpf = max_mbps / 172.0;
max_byte_per_frame0 = (uint64_t)(tmpf * bits_per_mb);
- max_byte_per_frame1 = (uint64_t)(((double)max_mbps * 100) / vdenc_context->frames_per_100s *bits_per_mb);
+ max_byte_per_frame1 = (uint64_t)(((double)max_mbps * vdenc_context->framerate.den) /
+ (double)vdenc_context->framerate.num * bits_per_mb);
/* TODO: check VAEncMiscParameterTypeMaxFrameSize */
ret = (unsigned int)MIN(max_byte_per_frame0, max_byte_per_frame1);
@@ -1586,12 +1588,12 @@ gen9_vdenc_calculate_initial_qp(VADriverContextP ctx,
frame_size = (vdenc_context->frame_width * vdenc_context->frame_height * 3 / 2);
qp = (int)(1.0 / 1.2 * pow(10.0,
- (log10(frame_size * 2.0 / 3.0 * ((float)vdenc_context->frames_per_100s) /
- ((float)(vdenc_context->target_bit_rate * 1000) * 100)) - x0) *
+ (log10(frame_size * 2.0 / 3.0 * vdenc_context->framerate.num /
+ ((double)vdenc_context->target_bit_rate * 1000.0 * vdenc_context->framerate.den)) - x0) *
(y1 - y0) / (x1 - x0) + y0) + 0.5);
qp += 2;
- delat_qp = (int)(9 - (vdenc_context->vbv_buffer_size_in_bit * ((float)vdenc_context->frames_per_100s) /
- ((float)(vdenc_context->target_bit_rate * 1000) * 100)));
+ delat_qp = (int)(9 - (vdenc_context->vbv_buffer_size_in_bit * ((double)vdenc_context->framerate.num) /
+ ((double)vdenc_context->target_bit_rate * 1000.0 * vdenc_context->framerate.den)));
if (delat_qp > 0)
qp += delat_qp;
@@ -1615,7 +1617,8 @@ gen9_vdenc_update_huc_brc_init_dmem(VADriverContextP ctx,
double input_bits_per_frame, bps_ratio;
int i;
- vdenc_context->brc_init_reset_input_bits_per_frame = ((double)(vdenc_context->max_bit_rate * 1000) * 100) / vdenc_context->frames_per_100s;
+ vdenc_context->brc_init_reset_input_bits_per_frame =
+ ((double)vdenc_context->max_bit_rate * 1000.0 * vdenc_context->framerate.den) / vdenc_context->framerate.num;
vdenc_context->brc_init_current_target_buf_full_in_bits = vdenc_context->brc_init_reset_input_bits_per_frame;
vdenc_context->brc_target_size = vdenc_context->init_vbv_buffer_fullness_in_bit;
@@ -1645,8 +1648,8 @@ gen9_vdenc_update_huc_brc_init_dmem(VADriverContextP ctx,
else if (vdenc_context->internal_rate_mode == I965_BRC_VBR)
dmem->brc_flag |= 0x20;
- dmem->frame_rate_m = vdenc_context->frames_per_100s;
- dmem->frame_rate_d = 100;
+ dmem->frame_rate_m = vdenc_context->framerate.num;
+ dmem->frame_rate_d = vdenc_context->framerate.den;
dmem->profile_level_max_frame = gen9_vdenc_get_profile_level_max_frame(ctx, encoder_context, seq_param->level_idc);
@@ -1656,8 +1659,9 @@ gen9_vdenc_update_huc_brc_init_dmem(VADriverContextP ctx,
dmem->min_qp = 10;
dmem->max_qp = 51;
- input_bits_per_frame = ((double)vdenc_context->max_bit_rate * 1000 * 100) / vdenc_context->frames_per_100s;
- bps_ratio = input_bits_per_frame / ((double)vdenc_context->vbv_buffer_size_in_bit * 100 / vdenc_context->frames_per_100s);
+ input_bits_per_frame = ((double)vdenc_context->max_bit_rate * 1000.0 * vdenc_context->framerate.den) / vdenc_context->framerate.num;
+ bps_ratio = input_bits_per_frame /
+ ((double)vdenc_context->vbv_buffer_size_in_bit * vdenc_context->framerate.den / vdenc_context->framerate.num);
if (bps_ratio < 0.1)
bps_ratio = 0.1;
diff --git a/src/gen9_vdenc.h b/src/gen9_vdenc.h
index e790497..41e4362 100644
--- a/src/gen9_vdenc.h
+++ b/src/gen9_vdenc.h
@@ -741,7 +741,7 @@ struct gen9_vdenc_context
uint32_t min_bit_rate; /* in kbps */
uint64_t init_vbv_buffer_fullness_in_bit;
uint64_t vbv_buffer_size_in_bit;
- uint32_t frames_per_100s;
+ struct intel_fraction framerate;
uint32_t gop_size;
uint32_t ref_dist;
uint32_t brc_target_size;
diff --git a/src/i965_encoder.c b/src/i965_encoder.c
index d874322..3aaac34 100644
--- a/src/i965_encoder.c
+++ b/src/i965_encoder.c
@@ -42,6 +42,17 @@
#include "i965_post_processing.h"
+static struct intel_fraction
+reduce_fraction(struct intel_fraction f)
+{
+ unsigned int a = f.num, b = f.den, c;
+ while ((c = a % b)) {
+ a = b;
+ b = c;
+ }
+ return (struct intel_fraction) { f.num / b, f.den / b };
+}
+
static VAStatus
clear_border(struct object_surface *obj_surface)
{
@@ -306,8 +317,9 @@ intel_encoder_check_brc_h264_sequence_parameter(VADriverContextP ctx,
struct intel_encoder_context *encoder_context)
{
VAEncSequenceParameterBufferH264 *seq_param = (VAEncSequenceParameterBufferH264 *)encode_state->seq_param_ext->buffer;
+ struct intel_fraction framerate;
+ unsigned int bits_per_second;
unsigned short num_pframes_in_gop, num_bframes_in_gop;
- unsigned int bits_per_second, framerate_per_100s;
if (!encoder_context->is_new_sequence)
return VA_STATUS_SUCCESS;
@@ -315,10 +327,13 @@ intel_encoder_check_brc_h264_sequence_parameter(VADriverContextP ctx,
assert(seq_param);
bits_per_second = seq_param->bits_per_second; // for the highest layer
- if (!seq_param->num_units_in_tick || !seq_param->time_scale)
- framerate_per_100s = 3000;
- else
- framerate_per_100s = seq_param->time_scale * 100 / (2 * seq_param->num_units_in_tick); // for the highest layer
+ if (!seq_param->num_units_in_tick || !seq_param->time_scale) {
+ framerate = (struct intel_fraction) { 30, 1 };
+ } else {
+ // for the highest layer
+ framerate = (struct intel_fraction) { seq_param->time_scale, 2 * seq_param->num_units_in_tick };
+ }
+ framerate = reduce_fraction(framerate);
encoder_context->brc.num_iframes_in_gop = 1; // Always 1
@@ -326,7 +341,7 @@ intel_encoder_check_brc_h264_sequence_parameter(VADriverContextP ctx,
if (seq_param->ip_period == 0)
goto error;
- encoder_context->brc.gop_size = (unsigned int)(framerate_per_100s / 100.0 + 0.5); // fake
+ encoder_context->brc.gop_size = (framerate.num + framerate.den - 1) / framerate.den; // fake
num_pframes_in_gop = (encoder_context->brc.gop_size +
seq_param->ip_period - 1) / seq_param->ip_period - 1;
} else if (seq_param->intra_period == 1) { // E.g. IDRIII...
@@ -347,11 +362,12 @@ intel_encoder_check_brc_h264_sequence_parameter(VADriverContextP ctx,
if (num_pframes_in_gop != encoder_context->brc.num_pframes_in_gop ||
num_bframes_in_gop != encoder_context->brc.num_bframes_in_gop ||
bits_per_second != encoder_context->brc.bits_per_second[encoder_context->layer.num_layers - 1] ||
- framerate_per_100s != encoder_context->brc.framerate_per_100s[encoder_context->layer.num_layers - 1]) {
+ framerate.num != encoder_context->brc.framerate[encoder_context->layer.num_layers - 1].num ||
+ framerate.den != encoder_context->brc.framerate[encoder_context->layer.num_layers - 1].den) {
encoder_context->brc.num_pframes_in_gop = num_pframes_in_gop;
encoder_context->brc.num_bframes_in_gop = num_bframes_in_gop;
encoder_context->brc.bits_per_second[encoder_context->layer.num_layers - 1] = bits_per_second;
- encoder_context->brc.framerate_per_100s[encoder_context->layer.num_layers - 1] = framerate_per_100s;
+ encoder_context->brc.framerate[encoder_context->layer.num_layers - 1] = framerate;
encoder_context->brc.need_reset = 1;
}
@@ -392,8 +408,9 @@ intel_encoder_check_brc_vp8_sequence_parameter(VADriverContextP ctx,
num_pframes_in_gop = encoder_context->brc.gop_size - 1;
bits_per_second = seq_param->bits_per_second; // for the highest layer
- if (!encoder_context->brc.framerate_per_100s[encoder_context->layer.num_layers - 1]) {
- encoder_context->brc.framerate_per_100s[encoder_context->layer.num_layers - 1] = 3000; // for the highest layer
+ if (!encoder_context->brc.framerate[encoder_context->layer.num_layers - 1].num) {
+ // for the highest layer
+ encoder_context->brc.framerate[encoder_context->layer.num_layers - 1] = (struct intel_fraction) { 30, 1 };
encoder_context->brc.need_reset = 1;
}
@@ -480,7 +497,7 @@ intel_encoder_check_framerate_parameter(VADriverContextP ctx,
struct intel_encoder_context *encoder_context,
VAEncMiscParameterFrameRate *misc)
{
- int framerate_per_100s;
+ struct intel_fraction framerate;
int temporal_id = 0;
if (encoder_context->layer.num_layers >= 2)
@@ -490,12 +507,14 @@ intel_encoder_check_framerate_parameter(VADriverContextP ctx,
return;
if (misc->framerate & 0xffff0000)
- framerate_per_100s = (misc->framerate & 0xffff) * 100 / ((misc->framerate >> 16) & 0xffff);
+ framerate = (struct intel_fraction) { misc->framerate & 0xffff, misc->framerate >> 16 & 0xffff };
else
- framerate_per_100s = misc->framerate * 100;
+ framerate = (struct intel_fraction) { misc->framerate, 1 };
+ framerate = reduce_fraction(framerate);
- if (encoder_context->brc.framerate_per_100s[temporal_id] != framerate_per_100s) {
- encoder_context->brc.framerate_per_100s[temporal_id] = framerate_per_100s;
+ if (encoder_context->brc.framerate[temporal_id].num != framerate.num ||
+ encoder_context->brc.framerate[temporal_id].den != framerate.den) {
+ encoder_context->brc.framerate[temporal_id] = framerate;
encoder_context->brc.need_reset = 1;
}
}
diff --git a/src/i965_encoder.h b/src/i965_encoder.h
index 0b636d6..7016975 100644
--- a/src/i965_encoder.h
+++ b/src/i965_encoder.h
@@ -55,6 +55,12 @@ struct intel_roi
char value;
};
+struct intel_fraction
+{
+ unsigned int num;
+ unsigned int den;
+};
+
struct intel_encoder_context
{
struct hw_context base;
@@ -80,7 +86,7 @@ struct intel_encoder_context
unsigned short num_pframes_in_gop;
unsigned short num_bframes_in_gop;
unsigned int bits_per_second[MAX_TEMPORAL_LAYERS];
- unsigned int framerate_per_100s[MAX_TEMPORAL_LAYERS];
+ struct intel_fraction framerate[MAX_TEMPORAL_LAYERS];
unsigned int mb_rate_control[MAX_TEMPORAL_LAYERS];
unsigned int target_percentage[MAX_TEMPORAL_LAYERS];
unsigned int hrd_buffer_size;
--
2.11.0
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