/*
* Rate control for video encoders
*
- * Copyright (c) 2002 Michael Niedermayer <michaelni@gmx.at>
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Rate control for video encoders.
*/
+
+#include "libavutil/attributes.h"
#include "avcodec.h"
-#include "dsputil.h"
+#include "ratecontrol.h"
#include "mpegvideo.h"
+#include "libavutil/eval.h"
-#define STATS_FILE "lavc_stats.txt"
+#undef NDEBUG // Always check asserts, the speed effect is far too small to disable them.
+#include <assert.h>
+
+#ifndef M_E
+#define M_E 2.718281828
+#endif
static int init_pass2(MpegEncContext *s);
+static double get_qscale(MpegEncContext *s, RateControlEntry *rce,
+ double rate_factor, int frame_num);
+
+void ff_write_pass1_stats(MpegEncContext *s)
+{
+ snprintf(s->avctx->stats_out, 256,
+ "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d "
+ "fcode:%d bcode:%d mc-var:%d var:%d icount:%d skipcount:%d hbits:%d;\n",
+ s->current_picture_ptr->f.display_picture_number,
+ s->current_picture_ptr->f.coded_picture_number,
+ s->pict_type,
+ s->current_picture.f.quality,
+ s->i_tex_bits,
+ s->p_tex_bits,
+ s->mv_bits,
+ s->misc_bits,
+ s->f_code,
+ s->b_code,
+ s->current_picture.mc_mb_var_sum,
+ s->current_picture.mb_var_sum,
+ s->i_count, s->skip_count,
+ s->header_bits);
+}
-void ff_write_pass1_stats(MpegEncContext *s){
- RateControlContext *rcc= &s->rc_context;
-// fprintf(c->stats_file, "type:%d q:%d icount:%d pcount:%d scount:%d itex:%d ptex%d mv:%d misc:%d fcode:%d bcode:%d\")
- fprintf(rcc->stats_file, "in:%d out:%d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d\n",
- s->picture_number, s->input_picture_number - s->max_b_frames, s->pict_type,
- s->qscale, s->i_tex_bits, s->p_tex_bits, s->mv_bits, s->misc_bits, s->f_code, s->b_code);
+static inline double qp2bits(RateControlEntry *rce, double qp)
+{
+ if (qp <= 0.0) {
+ av_log(NULL, AV_LOG_ERROR, "qp<=0.0\n");
+ }
+ return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits + 1) / qp;
+}
+
+static inline double bits2qp(RateControlEntry *rce, double bits)
+{
+ if (bits < 0.9) {
+ av_log(NULL, AV_LOG_ERROR, "bits<0.9\n");
+ }
+ return rce->qscale * (double)(rce->i_tex_bits + rce->p_tex_bits + 1) / bits;
}
-int ff_rate_control_init(MpegEncContext *s)
+av_cold int ff_rate_control_init(MpegEncContext *s)
{
- RateControlContext *rcc= &s->rc_context;
+ RateControlContext *rcc = &s->rc_context;
+ int i, res;
+ static const char * const const_names[] = {
+ "PI",
+ "E",
+ "iTex",
+ "pTex",
+ "tex",
+ "mv",
+ "fCode",
+ "iCount",
+ "mcVar",
+ "var",
+ "isI",
+ "isP",
+ "isB",
+ "avgQP",
+ "qComp",
+#if 0
+ "lastIQP",
+ "lastPQP",
+ "lastBQP",
+ "nextNonBQP",
+#endif
+ "avgIITex",
+ "avgPITex",
+ "avgPPTex",
+ "avgBPTex",
+ "avgTex",
+ NULL
+ };
+ static double (* const func1[])(void *, double) = {
+ (void *)bits2qp,
+ (void *)qp2bits,
+ NULL
+ };
+ static const char * const func1_names[] = {
+ "bits2qp",
+ "qp2bits",
+ NULL
+ };
emms_c();
- if(s->flags&CODEC_FLAG_PASS1){
- rcc->stats_file= fopen(STATS_FILE, "w");
- if(!rcc->stats_file){
- fprintf(stderr, "failed to open " STATS_FILE "\n");
- return -1;
- }
- } else if(s->flags&CODEC_FLAG_PASS2){
- int size;
+ res = av_expr_parse(&rcc->rc_eq_eval,
+ s->avctx->rc_eq ? s->avctx->rc_eq : "tex^qComp",
+ const_names, func1_names, func1,
+ NULL, NULL, 0, s->avctx);
+ if (res < 0) {
+ av_log(s->avctx, AV_LOG_ERROR, "Error parsing rc_eq \"%s\"\n", s->avctx->rc_eq);
+ return res;
+ }
+
+ for (i = 0; i < 5; i++) {
+ rcc->pred[i].coeff = FF_QP2LAMBDA * 7.0;
+ rcc->pred[i].count = 1.0;
+ rcc->pred[i].decay = 0.4;
+
+ rcc->i_cplx_sum [i] =
+ rcc->p_cplx_sum [i] =
+ rcc->mv_bits_sum[i] =
+ rcc->qscale_sum [i] =
+ rcc->frame_count[i] = 1; // 1 is better because of 1/0 and such
+
+ rcc->last_qscale_for[i] = FF_QP2LAMBDA * 5;
+ }
+ rcc->buffer_index = s->avctx->rc_initial_buffer_occupancy;
+
+ if (s->flags & CODEC_FLAG_PASS2) {
int i;
+ char *p;
- rcc->stats_file= fopen(STATS_FILE, "r");
- if(!rcc->stats_file){
- fprintf(stderr, "failed to open " STATS_FILE "\n");
+ /* find number of pics */
+ p = s->avctx->stats_in;
+ for (i = -1; p; i++)
+ p = strchr(p + 1, ';');
+ i += s->max_b_frames;
+ if (i <= 0 || i >= INT_MAX / sizeof(RateControlEntry))
return -1;
- }
+ rcc->entry = av_mallocz(i * sizeof(RateControlEntry));
+ rcc->num_entries = i;
- /* find number of pics without reading the file twice :) */
- fseek(rcc->stats_file, 0, SEEK_END);
- size= ftell(rcc->stats_file);
- fseek(rcc->stats_file, 0, SEEK_SET);
+ /* init all to skipped p frames
+ * (with b frames we might have a not encoded frame at the end FIXME) */
+ for (i = 0; i < rcc->num_entries; i++) {
+ RateControlEntry *rce = &rcc->entry[i];
- size/= 64; // we need at least 64 byte to store a line ...
- rcc->entry = (RateControlEntry*)av_mallocz(size*sizeof(RateControlEntry));
+ rce->pict_type = rce->new_pict_type = AV_PICTURE_TYPE_P;
+ rce->qscale = rce->new_qscale = FF_QP2LAMBDA * 2;
+ rce->misc_bits = s->mb_num + 10;
+ rce->mb_var_sum = s->mb_num * 100;
+ }
- for(i=0; !feof(rcc->stats_file); i++){
+ /* read stats */
+ p = s->avctx->stats_in;
+ for (i = 0; i < rcc->num_entries - s->max_b_frames; i++) {
RateControlEntry *rce;
int picture_number;
int e;
-
- e= fscanf(rcc->stats_file, "in:%d ", &picture_number);
- rce= &rcc->entry[picture_number];
- e+=fscanf(rcc->stats_file, "out:%*d type:%d q:%d itex:%d ptex:%d mv:%d misc:%d fcode:%*d bcode:%*d\n",
- &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits, &rce->mv_bits, &rce->misc_bits);
- if(e!=7){
- fprintf(stderr, STATS_FILE " is damaged\n");
+ char *next;
+
+ next = strchr(p, ';');
+ if (next) {
+ (*next) = 0; // sscanf in unbelievably slow on looong strings // FIXME copy / do not write
+ next++;
+ }
+ e = sscanf(p, " in:%d ", &picture_number);
+
+ assert(picture_number >= 0);
+ assert(picture_number < rcc->num_entries);
+ rce = &rcc->entry[picture_number];
+
+ e += sscanf(p, " in:%*d out:%*d type:%d q:%f itex:%d ptex:%d mv:%d misc:%d fcode:%d bcode:%d mc-var:%d var:%d icount:%d skipcount:%d hbits:%d",
+ &rce->pict_type, &rce->qscale, &rce->i_tex_bits, &rce->p_tex_bits,
+ &rce->mv_bits, &rce->misc_bits,
+ &rce->f_code, &rce->b_code,
+ &rce->mc_mb_var_sum, &rce->mb_var_sum,
+ &rce->i_count, &rce->skip_count, &rce->header_bits);
+ if (e != 14) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "statistics are damaged at line %d, parser out=%d\n",
+ i, e);
return -1;
}
+
+ p = next;
+ }
+
+ if (init_pass2(s) < 0)
+ return -1;
+
+ // FIXME maybe move to end
+ if ((s->flags & CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID) {
+#if CONFIG_LIBXVID
+ return ff_xvid_rate_control_init(s);
+#else
+ av_log(s->avctx, AV_LOG_ERROR,
+ "Xvid ratecontrol requires libavcodec compiled with Xvid support.\n");
+ return -1;
+#endif
+ }
+ }
+
+ if (!(s->flags & CODEC_FLAG_PASS2)) {
+ rcc->short_term_qsum = 0.001;
+ rcc->short_term_qcount = 0.001;
+
+ rcc->pass1_rc_eq_output_sum = 0.001;
+ rcc->pass1_wanted_bits = 0.001;
+
+ if (s->avctx->qblur > 1.0) {
+ av_log(s->avctx, AV_LOG_ERROR, "qblur too large\n");
+ return -1;
+ }
+ /* init stuff with the user specified complexity */
+ if (s->avctx->rc_initial_cplx) {
+ for (i = 0; i < 60 * 30; i++) {
+ double bits = s->avctx->rc_initial_cplx * (i / 10000.0 + 1.0) * s->mb_num;
+ RateControlEntry rce;
+
+ if (i % ((s->gop_size + 3) / 4) == 0)
+ rce.pict_type = AV_PICTURE_TYPE_I;
+ else if (i % (s->max_b_frames + 1))
+ rce.pict_type = AV_PICTURE_TYPE_B;
+ else
+ rce.pict_type = AV_PICTURE_TYPE_P;
+
+ rce.new_pict_type = rce.pict_type;
+ rce.mc_mb_var_sum = bits * s->mb_num / 100000;
+ rce.mb_var_sum = s->mb_num;
+
+ rce.qscale = FF_QP2LAMBDA * 2;
+ rce.f_code = 2;
+ rce.b_code = 1;
+ rce.misc_bits = 1;
+
+ if (s->pict_type == AV_PICTURE_TYPE_I) {
+ rce.i_count = s->mb_num;
+ rce.i_tex_bits = bits;
+ rce.p_tex_bits = 0;
+ rce.mv_bits = 0;
+ } else {
+ rce.i_count = 0; // FIXME we do know this approx
+ rce.i_tex_bits = 0;
+ rce.p_tex_bits = bits * 0.9;
+ rce.mv_bits = bits * 0.1;
+ }
+ rcc->i_cplx_sum[rce.pict_type] += rce.i_tex_bits * rce.qscale;
+ rcc->p_cplx_sum[rce.pict_type] += rce.p_tex_bits * rce.qscale;
+ rcc->mv_bits_sum[rce.pict_type] += rce.mv_bits;
+ rcc->frame_count[rce.pict_type]++;
+
+ get_qscale(s, &rce, rcc->pass1_wanted_bits / rcc->pass1_rc_eq_output_sum, i);
+
+ // FIXME misbehaves a little for variable fps
+ rcc->pass1_wanted_bits += s->bit_rate / (1 / av_q2d(s->avctx->time_base));
+ }
}
- rcc->num_entries= i;
-
- if(init_pass2(s) < 0) return -1;
}
-
- /* no 2pass stuff, just normal 1-pass */
- //initial values, they dont really matter as they will be totally different within a few frames
- s->i_pred.coeff= s->p_pred.coeff= 7.0;
- s->i_pred.count= s->p_pred.count= 1.0;
-
- s->i_pred.decay= s->p_pred.decay= 0.4;
-
- // use more bits at the beginning, otherwise high motion at the begin will look like shit
- s->qsum=100 * s->qmin;
- s->qcount=100;
-
- s->short_term_qsum=0.001;
- s->short_term_qcount=0.001;
return 0;
}
-void ff_rate_control_uninit(MpegEncContext *s)
+av_cold void ff_rate_control_uninit(MpegEncContext *s)
{
- RateControlContext *rcc= &s->rc_context;
+ RateControlContext *rcc = &s->rc_context;
emms_c();
- if(rcc->stats_file)
- fclose(rcc->stats_file);
- rcc->stats_file = NULL;
+ av_expr_free(rcc->rc_eq_eval);
av_freep(&rcc->entry);
+
+#if CONFIG_LIBXVID
+ if ((s->flags & CODEC_FLAG_PASS2) && s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
+ ff_xvid_rate_control_uninit(s);
+#endif
}
-//----------------------------------
+int ff_vbv_update(MpegEncContext *s, int frame_size)
+{
+ RateControlContext *rcc = &s->rc_context;
+ const double fps = 1 / av_q2d(s->avctx->time_base);
+ const int buffer_size = s->avctx->rc_buffer_size;
+ const double min_rate = s->avctx->rc_min_rate / fps;
+ const double max_rate = s->avctx->rc_max_rate / fps;
+
+ av_dlog(s, "%d %f %d %f %f\n",
+ buffer_size, rcc->buffer_index, frame_size, min_rate, max_rate);
+
+ if (buffer_size) {
+ int left;
+
+ rcc->buffer_index -= frame_size;
+ if (rcc->buffer_index < 0) {
+ av_log(s->avctx, AV_LOG_ERROR, "rc buffer underflow\n");
+ rcc->buffer_index = 0;
+ }
+
+ left = buffer_size - rcc->buffer_index - 1;
+ rcc->buffer_index += av_clip(left, min_rate, max_rate);
+
+ if (rcc->buffer_index > buffer_size) {
+ int stuffing = ceil((rcc->buffer_index - buffer_size) / 8);
+
+ if (stuffing < 4 && s->codec_id == AV_CODEC_ID_MPEG4)
+ stuffing = 4;
+ rcc->buffer_index -= 8 * stuffing;
+
+ if (s->avctx->debug & FF_DEBUG_RC)
+ av_log(s->avctx, AV_LOG_DEBUG, "stuffing %d bytes\n", stuffing);
+
+ return stuffing;
+ }
+ }
+ return 0;
+}
+
+/**
+ * Modify the bitrate curve from pass1 for one frame.
+ */
+static double get_qscale(MpegEncContext *s, RateControlEntry *rce,
+ double rate_factor, int frame_num)
+{
+ RateControlContext *rcc = &s->rc_context;
+ AVCodecContext *a = s->avctx;
+ const int pict_type = rce->new_pict_type;
+ const double mb_num = s->mb_num;
+ double q, bits;
+ int i;
+
+ double const_values[] = {
+ M_PI,
+ M_E,
+ rce->i_tex_bits * rce->qscale,
+ rce->p_tex_bits * rce->qscale,
+ (rce->i_tex_bits + rce->p_tex_bits) * (double)rce->qscale,
+ rce->mv_bits / mb_num,
+ rce->pict_type == AV_PICTURE_TYPE_B ? (rce->f_code + rce->b_code) * 0.5 : rce->f_code,
+ rce->i_count / mb_num,
+ rce->mc_mb_var_sum / mb_num,
+ rce->mb_var_sum / mb_num,
+ rce->pict_type == AV_PICTURE_TYPE_I,
+ rce->pict_type == AV_PICTURE_TYPE_P,
+ rce->pict_type == AV_PICTURE_TYPE_B,
+ rcc->qscale_sum[pict_type] / (double)rcc->frame_count[pict_type],
+ a->qcompress,
+#if 0
+ rcc->last_qscale_for[AV_PICTURE_TYPE_I],
+ rcc->last_qscale_for[AV_PICTURE_TYPE_P],
+ rcc->last_qscale_for[AV_PICTURE_TYPE_B],
+ rcc->next_non_b_qscale,
+#endif
+ rcc->i_cplx_sum[AV_PICTURE_TYPE_I] / (double)rcc->frame_count[AV_PICTURE_TYPE_I],
+ rcc->i_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],
+ rcc->p_cplx_sum[AV_PICTURE_TYPE_P] / (double)rcc->frame_count[AV_PICTURE_TYPE_P],
+ rcc->p_cplx_sum[AV_PICTURE_TYPE_B] / (double)rcc->frame_count[AV_PICTURE_TYPE_B],
+ (rcc->i_cplx_sum[pict_type] + rcc->p_cplx_sum[pict_type]) / (double)rcc->frame_count[pict_type],
+ 0
+ };
+
+ bits = av_expr_eval(rcc->rc_eq_eval, const_values, rce);
+ if (isnan(bits)) {
+ av_log(s->avctx, AV_LOG_ERROR, "Error evaluating rc_eq \"%s\"\n", s->avctx->rc_eq);
+ return -1;
+ }
+
+ rcc->pass1_rc_eq_output_sum += bits;
+ bits *= rate_factor;
+ if (bits < 0.0)
+ bits = 0.0;
+ bits += 1.0; // avoid 1/0 issues
+
+ /* user override */
+ for (i = 0; i < s->avctx->rc_override_count; i++) {
+ RcOverride *rco = s->avctx->rc_override;
+ if (rco[i].start_frame > frame_num)
+ continue;
+ if (rco[i].end_frame < frame_num)
+ continue;
+
+ if (rco[i].qscale)
+ bits = qp2bits(rce, rco[i].qscale); // FIXME move at end to really force it?
+ else
+ bits *= rco[i].quality_factor;
+ }
+
+ q = bits2qp(rce, bits);
+
+ /* I/B difference */
+ if (pict_type == AV_PICTURE_TYPE_I && s->avctx->i_quant_factor < 0.0)
+ q = -q * s->avctx->i_quant_factor + s->avctx->i_quant_offset;
+ else if (pict_type == AV_PICTURE_TYPE_B && s->avctx->b_quant_factor < 0.0)
+ q = -q * s->avctx->b_quant_factor + s->avctx->b_quant_offset;
+ if (q < 1)
+ q = 1;
+
+ return q;
+}
+
+static double get_diff_limited_q(MpegEncContext *s, RateControlEntry *rce, double q)
+{
+ RateControlContext *rcc = &s->rc_context;
+ AVCodecContext *a = s->avctx;
+ const int pict_type = rce->new_pict_type;
+ const double last_p_q = rcc->last_qscale_for[AV_PICTURE_TYPE_P];
+ const double last_non_b_q = rcc->last_qscale_for[rcc->last_non_b_pict_type];
+
+ if (pict_type == AV_PICTURE_TYPE_I &&
+ (a->i_quant_factor > 0.0 || rcc->last_non_b_pict_type == AV_PICTURE_TYPE_P))
+ q = last_p_q * FFABS(a->i_quant_factor) + a->i_quant_offset;
+ else if (pict_type == AV_PICTURE_TYPE_B &&
+ a->b_quant_factor > 0.0)
+ q = last_non_b_q * a->b_quant_factor + a->b_quant_offset;
+ if (q < 1)
+ q = 1;
+
+ /* last qscale / qdiff stuff */
+ if (rcc->last_non_b_pict_type == pict_type || pict_type != AV_PICTURE_TYPE_I) {
+ double last_q = rcc->last_qscale_for[pict_type];
+ const int maxdiff = FF_QP2LAMBDA * a->max_qdiff;
+
+ if (q > last_q + maxdiff)
+ q = last_q + maxdiff;
+ else if (q < last_q - maxdiff)
+ q = last_q - maxdiff;
+ }
+
+ rcc->last_qscale_for[pict_type] = q; // Note we cannot do that after blurring
+
+ if (pict_type != AV_PICTURE_TYPE_B)
+ rcc->last_non_b_pict_type = pict_type;
+
+ return q;
+}
+
+/**
+ * Get the qmin & qmax for pict_type.
+ */
+static void get_qminmax(int *qmin_ret, int *qmax_ret, MpegEncContext *s, int pict_type)
+{
+ int qmin = s->avctx->lmin;
+ int qmax = s->avctx->lmax;
+
+ assert(qmin <= qmax);
+
+ switch (pict_type) {
+ case AV_PICTURE_TYPE_B:
+ qmin = (int)(qmin * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset + 0.5);
+ qmax = (int)(qmax * FFABS(s->avctx->b_quant_factor) + s->avctx->b_quant_offset + 0.5);
+ break;
+ case AV_PICTURE_TYPE_I:
+ qmin = (int)(qmin * FFABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset + 0.5);
+ qmax = (int)(qmax * FFABS(s->avctx->i_quant_factor) + s->avctx->i_quant_offset + 0.5);
+ break;
+ }
+
+ qmin = av_clip(qmin, 1, FF_LAMBDA_MAX);
+ qmax = av_clip(qmax, 1, FF_LAMBDA_MAX);
+
+ if (qmax < qmin)
+ qmax = qmin;
+
+ *qmin_ret = qmin;
+ *qmax_ret = qmax;
+}
+
+static double modify_qscale(MpegEncContext *s, RateControlEntry *rce,
+ double q, int frame_num)
+{
+ RateControlContext *rcc = &s->rc_context;
+ const double buffer_size = s->avctx->rc_buffer_size;
+ const double fps = 1 / av_q2d(s->avctx->time_base);
+ const double min_rate = s->avctx->rc_min_rate / fps;
+ const double max_rate = s->avctx->rc_max_rate / fps;
+ const int pict_type = rce->new_pict_type;
+ int qmin, qmax;
+
+ get_qminmax(&qmin, &qmax, s, pict_type);
+
+ /* modulation */
+ if (s->avctx->rc_qmod_freq &&
+ frame_num % s->avctx->rc_qmod_freq == 0 &&
+ pict_type == AV_PICTURE_TYPE_P)
+ q *= s->avctx->rc_qmod_amp;
+
+ /* buffer overflow/underflow protection */
+ if (buffer_size) {
+ double expected_size = rcc->buffer_index;
+ double q_limit;
+
+ if (min_rate) {
+ double d = 2 * (buffer_size - expected_size) / buffer_size;
+ if (d > 1.0)
+ d = 1.0;
+ else if (d < 0.0001)
+ d = 0.0001;
+ q *= pow(d, 1.0 / s->avctx->rc_buffer_aggressivity);
+
+ q_limit = bits2qp(rce,
+ FFMAX((min_rate - buffer_size + rcc->buffer_index) *
+ s->avctx->rc_min_vbv_overflow_use, 1));
+
+ if (q > q_limit) {
+ if (s->avctx->debug & FF_DEBUG_RC)
+ av_log(s->avctx, AV_LOG_DEBUG,
+ "limiting QP %f -> %f\n", q, q_limit);
+ q = q_limit;
+ }
+ }
+
+ if (max_rate) {
+ double d = 2 * expected_size / buffer_size;
+ if (d > 1.0)
+ d = 1.0;
+ else if (d < 0.0001)
+ d = 0.0001;
+ q /= pow(d, 1.0 / s->avctx->rc_buffer_aggressivity);
+
+ q_limit = bits2qp(rce,
+ FFMAX(rcc->buffer_index *
+ s->avctx->rc_max_available_vbv_use,
+ 1));
+ if (q < q_limit) {
+ if (s->avctx->debug & FF_DEBUG_RC)
+ av_log(s->avctx, AV_LOG_DEBUG,
+ "limiting QP %f -> %f\n", q, q_limit);
+ q = q_limit;
+ }
+ }
+ }
+ av_dlog(s, "q:%f max:%f min:%f size:%f index:%f agr:%f\n",
+ q, max_rate, min_rate, buffer_size, rcc->buffer_index,
+ s->avctx->rc_buffer_aggressivity);
+ if (s->avctx->rc_qsquish == 0.0 || qmin == qmax) {
+ if (q < qmin)
+ q = qmin;
+ else if (q > qmax)
+ q = qmax;
+ } else {
+ double min2 = log(qmin);
+ double max2 = log(qmax);
+
+ q = log(q);
+ q = (q - min2) / (max2 - min2) - 0.5;
+ q *= -4.0;
+ q = 1.0 / (1.0 + exp(q));
+ q = q * (max2 - min2) + min2;
+
+ q = exp(q);
+ }
+
+ return q;
+}
+
+// ----------------------------------
// 1 Pass Code
-static double predict(Predictor *p, double q, double var)
+static double predict_size(Predictor *p, double q, double var)
{
- return p->coeff*var / (q*p->count);
+ return p->coeff * var / (q * p->count);
}
static void update_predictor(Predictor *p, double q, double var, double size)
{
- double new_coeff= size*q / (var + 1);
- if(var<1000) return;
+ double new_coeff = size * q / (var + 1);
+ if (var < 10)
+ return;
- p->count*= p->decay;
- p->coeff*= p->decay;
+ p->count *= p->decay;
+ p->coeff *= p->decay;
p->count++;
- p->coeff+= new_coeff;
+ p->coeff += new_coeff;
+}
+
+static void adaptive_quantization(MpegEncContext *s, double q)
+{
+ int i;
+ const float lumi_masking = s->avctx->lumi_masking / (128.0 * 128.0);
+ const float dark_masking = s->avctx->dark_masking / (128.0 * 128.0);
+ const float temp_cplx_masking = s->avctx->temporal_cplx_masking;
+ const float spatial_cplx_masking = s->avctx->spatial_cplx_masking;
+ const float p_masking = s->avctx->p_masking;
+ const float border_masking = s->avctx->border_masking;
+ float bits_sum = 0.0;
+ float cplx_sum = 0.0;
+ float *cplx_tab = s->cplx_tab;
+ float *bits_tab = s->bits_tab;
+ const int qmin = s->avctx->mb_lmin;
+ const int qmax = s->avctx->mb_lmax;
+ Picture *const pic = &s->current_picture;
+ const int mb_width = s->mb_width;
+ const int mb_height = s->mb_height;
+
+ for (i = 0; i < s->mb_num; i++) {
+ const int mb_xy = s->mb_index2xy[i];
+ float temp_cplx = sqrt(pic->mc_mb_var[mb_xy]); // FIXME merge in pow()
+ float spat_cplx = sqrt(pic->mb_var[mb_xy]);
+ const int lumi = pic->mb_mean[mb_xy];
+ float bits, cplx, factor;
+ int mb_x = mb_xy % s->mb_stride;
+ int mb_y = mb_xy / s->mb_stride;
+ int mb_distance;
+ float mb_factor = 0.0;
+ if (spat_cplx < 4)
+ spat_cplx = 4; // FIXME finetune
+ if (temp_cplx < 4)
+ temp_cplx = 4; // FIXME finetune
+
+ if ((s->mb_type[mb_xy] & CANDIDATE_MB_TYPE_INTRA)) { // FIXME hq mode
+ cplx = spat_cplx;
+ factor = 1.0 + p_masking;
+ } else {
+ cplx = temp_cplx;
+ factor = pow(temp_cplx, -temp_cplx_masking);
+ }
+ factor *= pow(spat_cplx, -spatial_cplx_masking);
+
+ if (lumi > 127)
+ factor *= (1.0 - (lumi - 128) * (lumi - 128) * lumi_masking);
+ else
+ factor *= (1.0 - (lumi - 128) * (lumi - 128) * dark_masking);
+
+ if (mb_x < mb_width / 5) {
+ mb_distance = mb_width / 5 - mb_x;
+ mb_factor = (float)mb_distance / (float)(mb_width / 5);
+ } else if (mb_x > 4 * mb_width / 5) {
+ mb_distance = mb_x - 4 * mb_width / 5;
+ mb_factor = (float)mb_distance / (float)(mb_width / 5);
+ }
+ if (mb_y < mb_height / 5) {
+ mb_distance = mb_height / 5 - mb_y;
+ mb_factor = FFMAX(mb_factor,
+ (float)mb_distance / (float)(mb_height / 5));
+ } else if (mb_y > 4 * mb_height / 5) {
+ mb_distance = mb_y - 4 * mb_height / 5;
+ mb_factor = FFMAX(mb_factor,
+ (float)mb_distance / (float)(mb_height / 5));
+ }
+
+ factor *= 1.0 - border_masking * mb_factor;
+
+ if (factor < 0.00001)
+ factor = 0.00001;
+
+ bits = cplx * factor;
+ cplx_sum += cplx;
+ bits_sum += bits;
+ cplx_tab[i] = cplx;
+ bits_tab[i] = bits;
+ }
+
+ /* handle qmin/qmax clipping */
+ if (s->flags & CODEC_FLAG_NORMALIZE_AQP) {
+ float factor = bits_sum / cplx_sum;
+ for (i = 0; i < s->mb_num; i++) {
+ float newq = q * cplx_tab[i] / bits_tab[i];
+ newq *= factor;
+
+ if (newq > qmax) {
+ bits_sum -= bits_tab[i];
+ cplx_sum -= cplx_tab[i] * q / qmax;
+ } else if (newq < qmin) {
+ bits_sum -= bits_tab[i];
+ cplx_sum -= cplx_tab[i] * q / qmin;
+ }
+ }
+ if (bits_sum < 0.001)
+ bits_sum = 0.001;
+ if (cplx_sum < 0.001)
+ cplx_sum = 0.001;
+ }
+
+ for (i = 0; i < s->mb_num; i++) {
+ const int mb_xy = s->mb_index2xy[i];
+ float newq = q * cplx_tab[i] / bits_tab[i];
+ int intq;
+
+ if (s->flags & CODEC_FLAG_NORMALIZE_AQP) {
+ newq *= bits_sum / cplx_sum;
+ }
+
+ intq = (int)(newq + 0.5);
+
+ if (intq > qmax)
+ intq = qmax;
+ else if (intq < qmin)
+ intq = qmin;
+ s->lambda_table[mb_xy] = intq;
+ }
}
-int ff_rate_estimate_qscale(MpegEncContext *s)
+void ff_get_2pass_fcode(MpegEncContext *s)
+{
+ RateControlContext *rcc = &s->rc_context;
+ RateControlEntry *rce = &rcc->entry[s->picture_number];
+
+ s->f_code = rce->f_code;
+ s->b_code = rce->b_code;
+}
+
+// FIXME rd or at least approx for dquant
+
+float ff_rate_estimate_qscale(MpegEncContext *s, int dry_run)
{
- int qmin= s->qmin;
- int qmax= s->qmax;
- int rate_q=5;
float q;
- int qscale;
+ int qmin, qmax;
float br_compensation;
double diff;
double short_term_q;
- double long_term_q;
double fps;
- int picture_number= s->input_picture_number - s->max_b_frames;
+ int picture_number = s->picture_number;
int64_t wanted_bits;
+ RateControlContext *rcc = &s->rc_context;
+ AVCodecContext *a = s->avctx;
+ RateControlEntry local_rce, *rce;
+ double bits;
+ double rate_factor;
+ int var;
+ const int pict_type = s->pict_type;
+ Picture * const pic = &s->current_picture;
emms_c();
- fps= (double)s->frame_rate / FRAME_RATE_BASE;
- wanted_bits= (uint64_t)(s->bit_rate*(double)picture_number/fps);
-// printf("%d %d %d\n", picture_number, (int)wanted_bits, (int)s->total_bits);
-
- if(s->pict_type==B_TYPE){
- qmin= (int)(qmin*s->b_quant_factor+s->b_quant_offset + 0.5);
- qmax= (int)(qmax*s->b_quant_factor+s->b_quant_offset + 0.5);
+#if CONFIG_LIBXVID
+ if ((s->flags & CODEC_FLAG_PASS2) &&
+ s->avctx->rc_strategy == FF_RC_STRATEGY_XVID)
+ return ff_xvid_rate_estimate_qscale(s, dry_run);
+#endif
+
+ get_qminmax(&qmin, &qmax, s, pict_type);
+
+ fps = 1 / av_q2d(s->avctx->time_base);
+ /* update predictors */
+ if (picture_number > 2 && !dry_run) {
+ const int last_var = s->last_pict_type == AV_PICTURE_TYPE_I ? rcc->last_mb_var_sum
+ : rcc->last_mc_mb_var_sum;
+ update_predictor(&rcc->pred[s->last_pict_type],
+ rcc->last_qscale,
+ sqrt(last_var), s->frame_bits);
}
- if(qmin<1) qmin=1;
- if(qmax>31) qmax=31;
- if(qmax<=qmin) qmax= qmin;
-
- /* update predictors */
- if(picture_number>2){
- if(s->pict_type!=B_TYPE && s->last_non_b_pict_type == P_TYPE){
-//printf("%d %d %d %f\n", s->qscale, s->last_mc_mb_var, s->frame_bits, s->p_pred.coeff);
- update_predictor(&s->p_pred, s->last_non_b_qscale, s->last_non_b_mc_mb_var, s->pb_frame_bits);
- }
+
+ if (s->flags & CODEC_FLAG_PASS2) {
+ assert(picture_number >= 0);
+ assert(picture_number < rcc->num_entries);
+ rce = &rcc->entry[picture_number];
+ wanted_bits = rce->expected_bits;
+ } else {
+ Picture *dts_pic;
+ rce = &local_rce;
+
+ /* FIXME add a dts field to AVFrame and ensure it is set and use it
+ * here instead of reordering but the reordering is simpler for now
+ * until H.264 B-pyramid must be handled. */
+ if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay)
+ dts_pic = s->current_picture_ptr;
+ else
+ dts_pic = s->last_picture_ptr;
+
+ if (!dts_pic || dts_pic->f.pts == AV_NOPTS_VALUE)
+ wanted_bits = (uint64_t)(s->bit_rate * (double)picture_number / fps);
+ else
+ wanted_bits = (uint64_t)(s->bit_rate * (double)dts_pic->f.pts / fps);
}
- if(s->pict_type == I_TYPE){
- short_term_q= s->short_term_qsum/s->short_term_qcount;
-
- long_term_q= s->qsum/s->qcount*(s->total_bits+1)/(wanted_bits+1); //+1 to avoid nan & 0
+ diff = s->total_bits - wanted_bits;
+ br_compensation = (a->bit_rate_tolerance - diff) / a->bit_rate_tolerance;
+ if (br_compensation <= 0.0)
+ br_compensation = 0.001;
- q= 1/((1/long_term_q - 1/short_term_q)*s->qcompress + 1/short_term_q);
- }else if(s->pict_type==B_TYPE){
- q= (int)(s->last_non_b_qscale*s->b_quant_factor+s->b_quant_offset + 0.5);
- }else{ //P Frame
- int i;
- int diff, best_diff=1000000000;
- for(i=1; i<=31; i++){
- diff= predict(&s->p_pred, i, s->mc_mb_var_sum) - (double)s->bit_rate/fps;
- if(diff<0) diff= -diff;
- if(diff<best_diff){
- best_diff= diff;
- rate_q= i;
- }
+ var = pict_type == AV_PICTURE_TYPE_I ? pic->mb_var_sum : pic->mc_mb_var_sum;
+
+ short_term_q = 0; /* avoid warning */
+ if (s->flags & CODEC_FLAG_PASS2) {
+ if (pict_type != AV_PICTURE_TYPE_I)
+ assert(pict_type == rce->new_pict_type);
+
+ q = rce->new_qscale / br_compensation;
+ av_dlog(s, "%f %f %f last:%d var:%d type:%d//\n", q, rce->new_qscale,
+ br_compensation, s->frame_bits, var, pict_type);
+ } else {
+ rce->pict_type =
+ rce->new_pict_type = pict_type;
+ rce->mc_mb_var_sum = pic->mc_mb_var_sum;
+ rce->mb_var_sum = pic->mb_var_sum;
+ rce->qscale = FF_QP2LAMBDA * 2;
+ rce->f_code = s->f_code;
+ rce->b_code = s->b_code;
+ rce->misc_bits = 1;
+
+ bits = predict_size(&rcc->pred[pict_type], rce->qscale, sqrt(var));
+ if (pict_type == AV_PICTURE_TYPE_I) {
+ rce->i_count = s->mb_num;
+ rce->i_tex_bits = bits;
+ rce->p_tex_bits = 0;
+ rce->mv_bits = 0;
+ } else {
+ rce->i_count = 0; // FIXME we do know this approx
+ rce->i_tex_bits = 0;
+ rce->p_tex_bits = bits * 0.9;
+ rce->mv_bits = bits * 0.1;
+ }
+ rcc->i_cplx_sum[pict_type] += rce->i_tex_bits * rce->qscale;
+ rcc->p_cplx_sum[pict_type] += rce->p_tex_bits * rce->qscale;
+ rcc->mv_bits_sum[pict_type] += rce->mv_bits;
+ rcc->frame_count[pict_type]++;
+
+ bits = rce->i_tex_bits + rce->p_tex_bits;
+ rate_factor = rcc->pass1_wanted_bits /
+ rcc->pass1_rc_eq_output_sum * br_compensation;
+
+ q = get_qscale(s, rce, rate_factor, picture_number);
+ if (q < 0)
+ return -1;
+
+ assert(q > 0.0);
+ q = get_diff_limited_q(s, rce, q);
+ assert(q > 0.0);
+
+ // FIXME type dependent blur like in 2-pass
+ if (pict_type == AV_PICTURE_TYPE_P || s->intra_only) {
+ rcc->short_term_qsum *= a->qblur;
+ rcc->short_term_qcount *= a->qblur;
+
+ rcc->short_term_qsum += q;
+ rcc->short_term_qcount++;
+ q = short_term_q = rcc->short_term_qsum / rcc->short_term_qcount;
}
- s->short_term_qsum*=s->qblur;
- s->short_term_qcount*=s->qblur;
+ assert(q > 0.0);
+
+ q = modify_qscale(s, rce, q, picture_number);
- s->short_term_qsum+= rate_q;
- s->short_term_qcount++;
- short_term_q= s->short_term_qsum/s->short_term_qcount;
-
- long_term_q= s->qsum/s->qcount*(s->total_bits+1)/(wanted_bits+1); //+1 to avoid nan & 0
+ rcc->pass1_wanted_bits += s->bit_rate / fps;
-// q= (long_term_q - short_term_q)*s->qcompress + short_term_q;
- q= 1/((1/long_term_q - 1/short_term_q)*s->qcompress + 1/short_term_q);
+ assert(q > 0.0);
}
- diff= s->total_bits - wanted_bits;
- br_compensation= (s->bit_rate_tolerance - diff)/s->bit_rate_tolerance;
- if(br_compensation<=0.0) br_compensation=0.001;
- q/=br_compensation;
-//printf("%f %f %f\n", q, br_compensation, short_term_q);
- qscale= (int)(q + 0.5);
- if (qscale<qmin) qscale=qmin;
- else if(qscale>qmax) qscale=qmax;
-
- if(s->pict_type!=B_TYPE){
- s->qsum+= qscale;
- s->qcount++;
- if (qscale<s->last_non_b_qscale-s->max_qdiff) qscale=s->last_non_b_qscale-s->max_qdiff;
- else if(qscale>s->last_non_b_qscale+s->max_qdiff) qscale=s->last_non_b_qscale+s->max_qdiff;
+ if (s->avctx->debug & FF_DEBUG_RC) {
+ av_log(s->avctx, AV_LOG_DEBUG,
+ "%c qp:%d<%2.1f<%d %d want:%d total:%d comp:%f st_q:%2.2f "
+ "size:%d var:%d/%d br:%d fps:%d\n",
+ av_get_picture_type_char(pict_type),
+ qmin, q, qmax, picture_number,
+ (int)wanted_bits / 1000, (int)s->total_bits / 1000,
+ br_compensation, short_term_q, s->frame_bits,
+ pic->mb_var_sum, pic->mc_mb_var_sum,
+ s->bit_rate / 1000, (int)fps);
}
-//printf("q:%d diff:%d comp:%f rate_q:%d st_q:%f fvar:%d last_size:%d\n", qscale, (int)diff, br_compensation,
-// rate_q, short_term_q, s->mc_mb_var, s->frame_bits);
-//printf("%d %d\n", s->bit_rate, (int)fps);
- return qscale;
+
+ if (q < qmin)
+ q = qmin;
+ else if (q > qmax)
+ q = qmax;
+
+ if (s->adaptive_quant)
+ adaptive_quantization(s, q);
+ else
+ q = (int)(q + 0.5);
+
+ if (!dry_run) {
+ rcc->last_qscale = q;
+ rcc->last_mc_mb_var_sum = pic->mc_mb_var_sum;
+ rcc->last_mb_var_sum = pic->mb_var_sum;
+ }
+ return q;
}
-//----------------------------------------------
+// ----------------------------------------------
// 2-Pass code
static int init_pass2(MpegEncContext *s)
{
- RateControlContext *rcc= &s->rc_context;
- int i;
- double fps= (double)s->frame_rate / FRAME_RATE_BASE;
- double complexity[5]={0,0,0,0,0}; // aproximate bits at quant=1
- double avg_quantizer[5];
- uint64_t const_bits[5]={0,0,0,0,0}; // quantizer idependant bits
- uint64_t available_bits[5];
+ RateControlContext *rcc = &s->rc_context;
+ AVCodecContext *a = s->avctx;
+ int i, toobig;
+ double fps = 1 / av_q2d(s->avctx->time_base);
+ double complexity[5] = { 0 }; // approximate bits at quant=1
+ uint64_t const_bits[5] = { 0 }; // quantizer independent bits
uint64_t all_const_bits;
- uint64_t all_available_bits= (uint64_t)(s->bit_rate*(double)rcc->num_entries/fps);
- int num_frames[5]={0,0,0,0,0};
- double rate_factor=0;
+ uint64_t all_available_bits = (uint64_t)(s->bit_rate *
+ (double)rcc->num_entries / fps);
+ double rate_factor = 0;
double step;
- int last_i_frame=-10000000;
+ const int filter_size = (int)(a->qblur * 4) | 1;
+ double expected_bits;
+ double *qscale, *blurred_qscale, qscale_sum;
/* find complexity & const_bits & decide the pict_types */
- for(i=0; i<rcc->num_entries; i++){
- RateControlEntry *rce= &rcc->entry[i];
-
- if(s->b_frame_strategy==0 || s->max_b_frames==0){
- rce->new_pict_type= rce->pict_type;
- }else{
- int j;
- int next_non_b_type=P_TYPE;
-
- switch(rce->pict_type){
- case I_TYPE:
- if(i-last_i_frame>s->gop_size/2){ //FIXME this is not optimal
- rce->new_pict_type= I_TYPE;
- last_i_frame= i;
- }else{
- rce->new_pict_type= P_TYPE; // will be caught by the scene detection anyway
- }
- break;
- case P_TYPE:
- rce->new_pict_type= P_TYPE;
- break;
- case B_TYPE:
- for(j=i+1; j<i+s->max_b_frames+2 && j<rcc->num_entries; j++){
- if(rcc->entry[j].pict_type != B_TYPE){
- next_non_b_type= rcc->entry[j].pict_type;
- break;
- }
- }
- if(next_non_b_type==I_TYPE)
- rce->new_pict_type= P_TYPE;
- else
- rce->new_pict_type= B_TYPE;
- break;
- }
- }
+ for (i = 0; i < rcc->num_entries; i++) {
+ RateControlEntry *rce = &rcc->entry[i];
+
+ rce->new_pict_type = rce->pict_type;
+ rcc->i_cplx_sum[rce->pict_type] += rce->i_tex_bits * rce->qscale;
+ rcc->p_cplx_sum[rce->pict_type] += rce->p_tex_bits * rce->qscale;
+ rcc->mv_bits_sum[rce->pict_type] += rce->mv_bits;
+ rcc->frame_count[rce->pict_type]++;
- complexity[rce->new_pict_type]+= (rce->i_tex_bits+ rce->p_tex_bits)*(double)rce->qscale;
- const_bits[rce->new_pict_type]+= rce->mv_bits + rce->misc_bits;
- num_frames[rce->new_pict_type]++;
+ complexity[rce->new_pict_type] += (rce->i_tex_bits + rce->p_tex_bits) *
+ (double)rce->qscale;
+ const_bits[rce->new_pict_type] += rce->mv_bits + rce->misc_bits;
}
- all_const_bits= const_bits[I_TYPE] + const_bits[P_TYPE] + const_bits[B_TYPE];
-
- if(all_available_bits < all_const_bits){
- fprintf(stderr, "requested bitrate is to low\n");
+
+ all_const_bits = const_bits[AV_PICTURE_TYPE_I] +
+ const_bits[AV_PICTURE_TYPE_P] +
+ const_bits[AV_PICTURE_TYPE_B];
+
+ if (all_available_bits < all_const_bits) {
+ av_log(s->avctx, AV_LOG_ERROR, "requested bitrate is too low\n");
return -1;
}
-// avg_complexity= complexity/rcc->num_entries;
- avg_quantizer[P_TYPE]=
- avg_quantizer[I_TYPE]= (complexity[I_TYPE]+complexity[P_TYPE] + complexity[B_TYPE]/s->b_quant_factor)
- / (all_available_bits - all_const_bits);
- avg_quantizer[B_TYPE]= avg_quantizer[P_TYPE]*s->b_quant_factor + s->b_quant_offset;
-//printf("avg quantizer: %f %f\n", avg_quantizer[P_TYPE], avg_quantizer[B_TYPE]);
+ qscale = av_malloc(sizeof(double) * rcc->num_entries);
+ blurred_qscale = av_malloc(sizeof(double) * rcc->num_entries);
+ toobig = 0;
+
+ for (step = 256 * 256; step > 0.0000001; step *= 0.5) {
+ expected_bits = 0;
+ rate_factor += step;
+
+ rcc->buffer_index = s->avctx->rc_buffer_size / 2;
- for(i=0; i<5; i++){
- available_bits[i]= const_bits[i] + complexity[i]/avg_quantizer[i];
- }
-//printf("%lld %lld %lld %lld\n", available_bits[I_TYPE], available_bits[P_TYPE], available_bits[B_TYPE], all_available_bits);
-
- for(step=256*256; step>0.0000001; step*=0.5){
- uint64_t expected_bits=0;
- rate_factor+= step;
/* find qscale */
- for(i=0; i<rcc->num_entries; i++){
- RateControlEntry *rce= &rcc->entry[i];
- double short_term_q, q, bits_left;
- const int pict_type= rce->new_pict_type;
- int qmin= s->qmin;
- int qmax= s->qmax;
-
- if(pict_type==B_TYPE){
- qmin= (int)(qmin*s->b_quant_factor+s->b_quant_offset + 0.5);
- qmax= (int)(qmax*s->b_quant_factor+s->b_quant_offset + 0.5);
- }
- if(qmin<1) qmin=1;
- if(qmax>31) qmax=31;
- if(qmax<=qmin) qmax= qmin;
-
- switch(s->rc_strategy){
- case 0:
- bits_left= available_bits[pict_type]/num_frames[pict_type]*rate_factor - rce->misc_bits - rce->mv_bits;
- if(bits_left<1.0) bits_left=1.0;
- short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits)/bits_left;
- break;
- case 1:
- bits_left= (available_bits[pict_type] - const_bits[pict_type])/num_frames[pict_type]*rate_factor;
- if(bits_left<1.0) bits_left=1.0;
- short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits)/bits_left;
- break;
- case 2:
- bits_left= available_bits[pict_type]/num_frames[pict_type]*rate_factor;
- if(bits_left<1.0) bits_left=1.0;
- short_term_q= rce->qscale*(rce->i_tex_bits + rce->p_tex_bits + rce->misc_bits + rce->mv_bits)/bits_left;
- break;
- default:
- fprintf(stderr, "unknown strategy\n");
- short_term_q=3; //gcc warning fix
- }
+ for (i = 0; i < rcc->num_entries; i++) {
+ RateControlEntry *rce = &rcc->entry[i];
+
+ qscale[i] = get_qscale(s, &rcc->entry[i], rate_factor, i);
+ rcc->last_qscale_for[rce->pict_type] = qscale[i];
+ }
+ assert(filter_size % 2 == 1);
- if(short_term_q>31.0) short_term_q=31.0;
- else if (short_term_q<1.0) short_term_q=1.0;
+ /* fixed I/B QP relative to P mode */
+ for (i = rcc->num_entries - 1; i >= 0; i--) {
+ RateControlEntry *rce = &rcc->entry[i];
- q= 1/((1/avg_quantizer[pict_type] - 1/short_term_q)*s->qcompress + 1/short_term_q);
- if (q<qmin) q=qmin;
- else if(q>qmax) q=qmax;
-//printf("lq:%f, sq:%f t:%f q:%f\n", avg_quantizer[rce->pict_type], short_term_q, bits_left, q);
- rce->new_qscale= q;
+ qscale[i] = get_diff_limited_q(s, rce, qscale[i]);
}
/* smooth curve */
-
- /* find expected bits */
- for(i=0; i<rcc->num_entries; i++){
- RateControlEntry *rce= &rcc->entry[i];
- double factor= rce->qscale / rce->new_qscale;
-
- rce->expected_bits= expected_bits;
- expected_bits += (int)(rce->misc_bits + rce->mv_bits + (rce->i_tex_bits + rce->p_tex_bits)*factor + 0.5);
+ for (i = 0; i < rcc->num_entries; i++) {
+ RateControlEntry *rce = &rcc->entry[i];
+ const int pict_type = rce->new_pict_type;
+ int j;
+ double q = 0.0, sum = 0.0;
+
+ for (j = 0; j < filter_size; j++) {
+ int index = i + j - filter_size / 2;
+ double d = index - i;
+ double coeff = a->qblur == 0 ? 1.0 : exp(-d * d / (a->qblur * a->qblur));
+
+ if (index < 0 || index >= rcc->num_entries)
+ continue;
+ if (pict_type != rcc->entry[index].new_pict_type)
+ continue;
+ q += qscale[index] * coeff;
+ sum += coeff;
+ }
+ blurred_qscale[i] = q / sum;
}
-// printf("%d %d %f\n", (int)expected_bits, (int)all_available_bits, rate_factor);
- if(expected_bits > all_available_bits) rate_factor-= step;
- }
+ /* find expected bits */
+ for (i = 0; i < rcc->num_entries; i++) {
+ RateControlEntry *rce = &rcc->entry[i];
+ double bits;
- return 0;
-}
+ rce->new_qscale = modify_qscale(s, rce, blurred_qscale[i], i);
-int ff_rate_estimate_qscale_pass2(MpegEncContext *s)
-{
- int qmin= s->qmin;
- int qmax= s->qmax;
- float q;
- int qscale;
- float br_compensation;
- double diff;
- int picture_number= s->picture_number;
- RateControlEntry *rce= &s->rc_context.entry[picture_number];
- int64_t wanted_bits= rce->expected_bits;
- emms_c();
+ bits = qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits;
+ bits += 8 * ff_vbv_update(s, bits);
-// printf("%d %d %d\n", picture_number, (int)wanted_bits, (int)s->total_bits);
-
- if(s->pict_type==B_TYPE){
- qmin= (int)(qmin*s->b_quant_factor+s->b_quant_offset + 0.5);
- qmax= (int)(qmax*s->b_quant_factor+s->b_quant_offset + 0.5);
+ rce->expected_bits = expected_bits;
+ expected_bits += bits;
+ }
+
+ av_dlog(s->avctx,
+ "expected_bits: %f all_available_bits: %d rate_factor: %f\n",
+ expected_bits, (int)all_available_bits, rate_factor);
+ if (expected_bits > all_available_bits) {
+ rate_factor -= step;
+ ++toobig;
+ }
}
- if(qmin<1) qmin=1;
- if(qmax>31) qmax=31;
- if(qmax<=qmin) qmax= qmin;
-
- q= rce->new_qscale;
-
- diff= s->total_bits - wanted_bits;
- br_compensation= (s->bit_rate_tolerance - diff)/s->bit_rate_tolerance;
- if(br_compensation<=0.0) br_compensation=0.001;
- q/=br_compensation;
-
- qscale= (int)(q + 0.5);
- if (qscale<qmin) qscale=qmin;
- else if(qscale>qmax) qscale=qmax;
-// printf("%d %d %d %d type:%d\n", qmin, qscale, qmax, picture_number, s->pict_type); fflush(stdout);
- return qscale;
+ av_free(qscale);
+ av_free(blurred_qscale);
+
+ /* check bitrate calculations and print info */
+ qscale_sum = 0.0;
+ for (i = 0; i < rcc->num_entries; i++) {
+ av_dlog(s, "[lavc rc] entry[%d].new_qscale = %.3f qp = %.3f\n",
+ i,
+ rcc->entry[i].new_qscale,
+ rcc->entry[i].new_qscale / FF_QP2LAMBDA);
+ qscale_sum += av_clip(rcc->entry[i].new_qscale / FF_QP2LAMBDA,
+ s->avctx->qmin, s->avctx->qmax);
+ }
+ assert(toobig <= 40);
+ av_log(s->avctx, AV_LOG_DEBUG,
+ "[lavc rc] requested bitrate: %d bps expected bitrate: %d bps\n",
+ s->bit_rate,
+ (int)(expected_bits / ((double)all_available_bits / s->bit_rate)));
+ av_log(s->avctx, AV_LOG_DEBUG,
+ "[lavc rc] estimated target average qp: %.3f\n",
+ (float)qscale_sum / rcc->num_entries);
+ if (toobig == 0) {
+ av_log(s->avctx, AV_LOG_INFO,
+ "[lavc rc] Using all of requested bitrate is not "
+ "necessary for this video with these parameters.\n");
+ } else if (toobig == 40) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "[lavc rc] Error: bitrate too low for this video "
+ "with these parameters.\n");
+ return -1;
+ } else if (fabs(expected_bits / all_available_bits - 1.0) > 0.01) {
+ av_log(s->avctx, AV_LOG_ERROR,
+ "[lavc rc] Error: 2pass curve failed to converge\n");
+ return -1;
+ }
+
+ return 0;
}
projects / ffmpeg / blobdiff