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/****************************************************************************** |
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* |
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* XviD Bit Rate Controller Library |
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* - VBR 2 pass bitrate controler implementation - |
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* |
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* Copyright (C) 2002-2003 Edouard Gomez <ed.gomez@free.fr> |
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* |
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* The curve treatment algorithm is the one implemented by Foxer <email?> and |
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* Dirk Knop <dknop@gwdg.de> for the XviD vfw dynamic library. |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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* |
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* $Id$ |
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* |
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*****************************************************************************/ |
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#include <stdio.h> |
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#include <errno.h> /* errno var (or function with recent libc) */ |
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#include <string.h> /* strerror() */ |
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#include "../xvid.h" |
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#include "../image/image.h" |
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/* This preprocessor constant controls wheteher or not, first pass is done |
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* using fast ME routines to speed up the 2pass process at the expense of |
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* less precise first pass stats */ |
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#define FAST1PASS |
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/* context struct */ |
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typedef struct |
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{ |
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FILE * stat_file; |
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double fq_error; |
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} rc_2pass1_t; |
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static int rc_2pass1_create(xvid_plg_create_t * create, rc_2pass1_t ** handle) |
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{ |
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xvid_plugin_2pass1_t * param = (xvid_plugin_2pass1_t *)create->param; |
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rc_2pass1_t * rc; |
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/* check filename */ |
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if ((param->filename == NULL) || |
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(param->filename != NULL && param->filename[0] == '\0')) |
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return XVID_ERR_FAIL; |
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/* allocate context struct */ |
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if((rc = malloc(sizeof(rc_2pass1_t))) == NULL) |
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return(XVID_ERR_MEMORY); |
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/* Initialize safe defaults for 2pass 1 */ |
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rc->stat_file = NULL; |
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/* Open the 1st pass file */ |
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if((rc->stat_file = fopen(param->filename, "w+b")) == NULL) |
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return(XVID_ERR_FAIL); |
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/* I swear xvidcore isn't buggy, but when using mencoder+xvid4 i observe |
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* this weird bug. |
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* |
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* Symptoms: The stats file grows until it's fclosed, but at this moment |
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* a large part of the file is filled by 0x00 bytes w/o any |
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* reasonable cause. The stats file is then completly unusable |
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* |
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* So far, i think i found "the why": |
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* - take a MPEG stream containing 2 sequences (concatenate 2 MPEG files |
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* together) |
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* - Encode this MPEG file |
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* |
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* It should trigger the bug |
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* |
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* I think this is caused by some kind of race condition on mencoder module |
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* start/stop. |
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* - mencoder encodes the first sequence |
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* + xvid4 module opens xvid-twopass.stats and writes stats in it. |
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* - mencoder detects the second sequence and initialize a second |
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* module and stops the old encoder |
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* + new xvid4 module opens a new xvid-twopass.stats, old xvid4 |
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* module closes it |
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* |
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* This is IT, got a racing condition. |
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* Unbuffered IO, may help ... */ |
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setbuf(rc->stat_file, NULL); |
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/* |
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* The File Header |
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*/ |
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fprintf(rc->stat_file, "# XviD 2pass stat file (core version %d.%d.%d)\n", |
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XVID_VERSION_MAJOR(XVID_VERSION), |
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XVID_VERSION_MINOR(XVID_VERSION), |
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XVID_VERSION_PATCH(XVID_VERSION)); |
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fprintf(rc->stat_file, "# Please do not modify this file\n\n"); |
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rc->fq_error = 0; |
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*handle = rc; |
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return(0); |
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} |
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static int rc_2pass1_destroy(rc_2pass1_t * rc, xvid_plg_destroy_t * destroy) |
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{ |
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if (rc->stat_file) { |
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if (fclose(rc->stat_file) == EOF) { |
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DPRINTF(XVID_DEBUG_RC, "Error closing stats file (%s)", strerror(errno)); |
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} |
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} |
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rc->stat_file = NULL; /* Just a paranoid reset */ |
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free(rc); /* as the container structure is freed anyway */ |
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return(0); |
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} |
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static int rc_2pass1_before(rc_2pass1_t * rc, xvid_plg_data_t * data) |
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{ |
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if (data->quant <= 0) { |
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if (data->zone && data->zone->mode == XVID_ZONE_QUANT) { |
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/* We disable no options in quant zones, as their implementation is |
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* based on the fact we do first pass exactly the same way as the |
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* second one to have exact zone size */ |
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rc->fq_error += (double)data->zone->increment / (double)data->zone->base; |
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data->quant = (int)rc->fq_error; |
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rc->fq_error -= data->quant; |
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} else { |
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data->quant = 2; |
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#ifdef FAST1PASS |
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/* Given the fact our 2pass algorithm is based on very simple |
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* rules, we can disable some options that are too CPU intensive |
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* and do not provide the 2nd pass any benefit */ |
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/* First disable some motion flags */ |
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data->motion_flags &= ~XVID_ME_CHROMA_PVOP; |
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data->motion_flags &= ~XVID_ME_CHROMA_BVOP; |
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data->motion_flags &= ~XVID_ME_USESQUARES16; |
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data->motion_flags &= ~XVID_ME_ADVANCEDDIAMOND16; |
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data->motion_flags &= ~XVID_ME_EXTSEARCH16; |
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/* And enable fast replacements */ |
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data->motion_flags |= XVID_ME_FAST_MODEINTERPOLATE; |
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data->motion_flags |= XVID_ME_SKIP_DELTASEARCH; |
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data->motion_flags |= XVID_ME_FASTREFINE16; |
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data->motion_flags |= XVID_ME_BFRAME_EARLYSTOP; |
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/* Now VOP flags (no fast replacements) */ |
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data->vop_flags &= ~XVID_VOP_MODEDECISION_RD; |
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data->vop_flags &= ~XVID_VOP_FAST_MODEDECISION_RD; |
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data->vop_flags &= ~XVID_VOP_TRELLISQUANT; |
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data->vop_flags &= ~XVID_VOP_INTER4V; |
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data->vop_flags &= ~XVID_VOP_HQACPRED; |
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/* Finnaly VOL flags |
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* |
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* NB: Qpel cannot be disable because this option really changes |
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* too much the texture data compressibility, and thus the |
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* second pass gets confused by too much impredictability |
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* of frame sizes, and actually hurts quality */ |
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data->vol_flags &= ~XVID_VOL_GMC; |
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#endif |
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} |
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} |
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return(0); |
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} |
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static int rc_2pass1_after(rc_2pass1_t * rc, xvid_plg_data_t * data) |
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{ |
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char type; |
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xvid_enc_stats_t *stats = &data->stats; |
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/* Frame type in ascii I/P/B */ |
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switch(stats->type) { |
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case XVID_TYPE_IVOP: |
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type = 'i'; |
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break; |
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case XVID_TYPE_PVOP: |
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type = 'p'; |
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break; |
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case XVID_TYPE_BVOP: |
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type = 'b'; |
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break; |
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case XVID_TYPE_SVOP: |
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type = 's'; |
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break; |
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default: /* Should not go here */ |
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return(XVID_ERR_FAIL); |
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} |
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/* write the resulting statistics */ |
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fprintf(rc->stat_file, "%c %d %d %d %d %d %d\n", |
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type, |
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stats->quant, |
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stats->kblks, |
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stats->mblks, |
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stats->ublks, |
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stats->length, |
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stats->hlength); |
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return(0); |
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} |
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int xvid_plugin_2pass1(void * handle, int opt, void * param1, void * param2) |
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{ |
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switch(opt) |
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{ |
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case XVID_PLG_INFO : |
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case XVID_PLG_FRAME : |
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return 0; |
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case XVID_PLG_CREATE : |
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return rc_2pass1_create((xvid_plg_create_t*)param1, param2); |
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case XVID_PLG_DESTROY : |
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return rc_2pass1_destroy((rc_2pass1_t*)handle, (xvid_plg_destroy_t*)param1); |
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case XVID_PLG_BEFORE : |
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return rc_2pass1_before((rc_2pass1_t*)handle, (xvid_plg_data_t*)param1); |
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case XVID_PLG_AFTER : |
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return rc_2pass1_after((rc_2pass1_t*)handle, (xvid_plg_data_t*)param1); |
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} |
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return XVID_ERR_FAIL; |
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} |
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