| /* |
| * 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 "libavutil/attributes.h" |
| #include "libavutil/internal.h" |
| |
| #include "avcodec.h" |
| #include "internal.h" |
| #include "ratecontrol.h" |
| #include "mpegutils.h" |
| #include "mpegvideo.h" |
| #include "libavutil/eval.h" |
| |
| 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:%"PRId64" var:%"PRId64" 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; |
| } |
| |
| av_cold 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->rc_eq ? s->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->rc_eq); |
| return res; |
| } |
| |
| #if FF_API_RC_STRATEGY |
| FF_DISABLE_DEPRECATION_WARNINGS |
| if (!s->rc_strategy) |
| s->rc_strategy = s->avctx->rc_strategy; |
| FF_ENABLE_DEPRECATION_WARNINGS |
| #endif |
| |
| 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->avctx->flags & AV_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)); |
| if (!rcc->entry) |
| return AVERROR(ENOMEM); |
| 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); |
| |
| av_assert0(picture_number >= 0); |
| av_assert0(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:%"SCNd64" var:%"SCNd64" 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) { |
| ff_rate_control_uninit(s); |
| return -1; |
| } |
| |
| #if FF_API_RC_STRATEGY |
| av_assert0(MPV_RC_STRATEGY_XVID == FF_RC_STRATEGY_XVID); |
| #endif |
| |
| // FIXME maybe move to end |
| if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == MPV_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->avctx->flags & AV_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->rc_initial_cplx) { |
| for (i = 0; i < 60 * 30; i++) { |
| double bits = s->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; |
| } |
| |
| av_cold 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->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == MPV_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; |
| |
| ff_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"); |
| if (frame_size > max_rate && s->qscale == s->avctx->qmax) { |
| av_log(s->avctx, AV_LOG_ERROR, "max bitrate possibly too small or try trellis with large lmax or increase qmax\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->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->lmin; |
| int qmax = s->lmax; |
| |
| av_assert0(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->rc_qmod_freq && |
| frame_num % s->rc_qmod_freq == 0 && |
| pict_type == AV_PICTURE_TYPE_P) |
| q *= s->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->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->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; |
| } |
| } |
| } |
| ff_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->rc_buffer_aggressivity); |
| if (s->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->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->mpv_flags & FF_MPV_FLAG_NAQ) { |
| 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->mpv_flags & FF_MPV_FLAG_NAQ) { |
| 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; |
| int64_t var; |
| const int pict_type = s->pict_type; |
| Picture * const pic = &s->current_picture; |
| emms_c(); |
| |
| #if CONFIG_LIBXVID |
| if ((s->avctx->flags & AV_CODEC_FLAG_PASS2) && s->rc_strategy == MPV_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 int64_t 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->avctx->flags & AV_CODEC_FLAG_PASS2) { |
| av_assert0(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->avctx->flags & AV_CODEC_FLAG_PASS2) { |
| if (pict_type != AV_PICTURE_TYPE_I) |
| av_assert0(pict_type == rce->new_pict_type); |
| |
| q = rce->new_qscale / br_compensation; |
| ff_dlog(s, "%f %f %f last:%d var:%"PRId64" 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]++; |
| |
| 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; |
| |
| av_assert0(q > 0.0); |
| q = get_diff_limited_q(s, rce, q); |
| av_assert0(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; |
| } |
| av_assert0(q > 0.0); |
| |
| q = modify_qscale(s, rce, q, picture_number); |
| |
| rcc->pass1_wanted_bits += s->bit_rate / fps; |
| |
| av_assert0(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:%"PRId64"/%"PRId64" br:%"PRId64" 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 = 0; // init to silence gcc warning |
| 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_array(rcc->num_entries, sizeof(double)); |
| blurred_qscale = av_malloc_array(rcc->num_entries, sizeof(double)); |
| if (!qscale || !blurred_qscale) { |
| av_free(qscale); |
| av_free(blurred_qscale); |
| return AVERROR(ENOMEM); |
| } |
| 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]; |
| } |
| av_assert0(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; |
| } |
| |
| ff_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++) { |
| ff_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); |
| } |
| av_assert0(toobig <= 40); |
| av_log(s->avctx, AV_LOG_DEBUG, |
| "[lavc rc] requested bitrate: %"PRId64" bps expected bitrate: %"PRId64" bps\n", |
| s->bit_rate, |
| (int64_t)(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; |
| } |
