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Diffstat (limited to 'ffmpeg/libavcodec/ratecontrol.c')
| -rw-r--r-- | ffmpeg/libavcodec/ratecontrol.c | 1062 |
1 files changed, 1062 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/ratecontrol.c b/ffmpeg/libavcodec/ratecontrol.c new file mode 100644 index 0000000..5860423 --- /dev/null +++ b/ffmpeg/libavcodec/ratecontrol.c @@ -0,0 +1,1062 @@ +/* + * Rate control for video encoders + * + * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> + * + * This file is part of FFmpeg. + * + * FFmpeg 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 2.1 of the License, or (at your option) any later version. + * + * FFmpeg 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 FFmpeg; 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 "avcodec.h" +#include "ratecontrol.h" +#include "mpegvideo.h" +#include "libavutil/eval.h" + +#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); +} + +static double get_fps(AVCodecContext *avctx) +{ + return 1.0 / av_q2d(avctx->time_base) / FFMAX(avctx->ticks_per_frame, 1); +} + +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) +{ + 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->avctx->rc_max_available_vbv_use && s->avctx->rc_buffer_size) { + if (s->avctx->rc_max_rate) { + s->avctx->rc_max_available_vbv_use = av_clipf(s->avctx->rc_max_rate/(s->avctx->rc_buffer_size*get_fps(s->avctx)), 1.0/3, 1.0); + } else + s->avctx->rc_max_available_vbv_use = 1.0; + } + + 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 (!rcc->buffer_index) + rcc->buffer_index = s->avctx->rc_buffer_size * 3 / 4; + + if (s->flags & CODEC_FLAG_PASS2) { + int i; + char *p; + + /* 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; + + /* 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]; + + 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; + } + + /* 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; + 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 / get_fps(s->avctx); + } + } + } + + return 0; +} + +void ff_rate_control_uninit(MpegEncContext *s) +{ + RateControlContext *rcc = &s->rc_context; + emms_c(); + + 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 = get_fps(s->avctx); + 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 = get_fps(s->avctx); + 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_size(Predictor *p, double q, double var) +{ + 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 < 10) + return; + + p->count *= p->decay; + p->coeff *= p->decay; + p->count++; + 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; + } +} + +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) +{ + float q; + int qmin, qmax; + float br_compensation; + double diff; + double short_term_q; + double fps; + 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(); + +#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 = get_fps(s->avctx); + /* 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; + av_assert1(s->frame_bits >= s->stuffing_bits); + update_predictor(&rcc->pred[s->last_pict_type], + rcc->last_qscale, + sqrt(last_var), + s->frame_bits - s->stuffing_bits); + } + + if (s->flags & CODEC_FLAG_PASS2) { + assert(picture_number >= 0); + if (picture_number >= rcc->num_entries) { + av_log(s, AV_LOG_ERROR, "Input is longer than 2-pass log file\n"); + return -1; + } + 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); + } + + 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; + + 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; + } + assert(q > 0.0); + + q = modify_qscale(s, rce, q, picture_number); + + rcc->pass1_wanted_bits += s->bit_rate / fps; + + assert(q > 0.0); + } + + 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); + } + + 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; + AVCodecContext *a = s->avctx; + int i, toobig; + double fps = get_fps(s->avctx); + 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); + double rate_factor = 0; + double step; + 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]; + + 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; + } + + 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; + } + + 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; + + /* find qscale */ + 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); + + /* fixed I/B QP relative to P mode */ + for (i = FFMAX(0, rcc->num_entries - 300); i < rcc->num_entries; i++) { + RateControlEntry *rce = &rcc->entry[i]; + + qscale[i] = get_diff_limited_q(s, rce, qscale[i]); + } + + for (i = rcc->num_entries - 1; i >= 0; i--) { + RateControlEntry *rce = &rcc->entry[i]; + + qscale[i] = get_diff_limited_q(s, rce, qscale[i]); + } + + /* smooth curve */ + 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; + } + + /* find expected bits */ + for (i = 0; i < rcc->num_entries; i++) { + RateControlEntry *rce = &rcc->entry[i]; + double bits; + + rce->new_qscale = modify_qscale(s, rce, blurred_qscale[i], i); + + bits = qp2bits(rce, rce->new_qscale) + rce->mv_bits + rce->misc_bits; + bits += 8 * ff_vbv_update(s, bits); + + 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; + } + } + 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; +} |