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/***************************************************************************** |
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* |
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* XviD Standard Plugins |
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* - single-pass bitrate controller implementation - |
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* |
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* Copyright(C) 2002 Benjamin Lambert <foxer@hotmail.com> |
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* 2002-2003 Edouard Gomez <ed.gomez@free.fr> |
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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 <limits.h> |
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#include "../xvid.h" |
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#include "../image/image.h" |
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#define DEFAULT_INITIAL_QUANTIZER 4 |
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#define DEFAULT_BITRATE 900000 /* 900kbps */ |
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#define DEFAULT_DELAY_FACTOR 16 |
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#define DEFAULT_AVERAGING_PERIOD 100 |
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#define DEFAULT_BUFFER 100 |
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|
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typedef struct |
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{ |
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int reaction_delay_factor; |
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int averaging_period; |
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int buffer; |
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|
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int bytes_per_sec; |
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double target_framesize; |
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|
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double time; |
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int64_t total_size; |
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int rtn_quant; |
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double sequence_quality; |
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double avg_framesize; |
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double quant_error[31]; |
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double fq_error; |
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} |
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rc_single_t; |
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static int |
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get_initial_quant(unsigned int bitrate) |
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{ |
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|
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#if defined(DEFAULT_INITIAL_QUANTIZER) |
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return (DEFAULT_INITIAL_QUANTIZER); |
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#else |
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int i; |
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|
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const unsigned int bitrate_quant[31] = { |
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UINT_MAX |
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}; |
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|
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for (i = 30; i >= 0; i--) { |
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if (bitrate > bitrate_quant[i]) |
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continue; |
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} |
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|
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return (i + 1); |
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#endif |
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} |
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static int |
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rc_single_create(xvid_plg_create_t * create, |
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rc_single_t ** handle) |
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{ |
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xvid_plugin_single_t *param = (xvid_plugin_single_t *) create->param; |
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rc_single_t *rc; |
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int i; |
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/* |
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* single needs to caclculate the average frame size. In order to do that, |
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* we really need valid fps |
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*/ |
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if (create->fincr == 0) { |
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return XVID_ERR_FAIL; |
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} |
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|
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/* Allocate context struct */ |
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if ((rc = malloc(sizeof(rc_single_t))) == NULL) |
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return (XVID_ERR_MEMORY); |
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|
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/* Constants */ |
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rc->bytes_per_sec = (param->bitrate > 0) ? param->bitrate / 8 : DEFAULT_BITRATE / 8; |
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rc->target_framesize =(double) rc->bytes_per_sec / ((double) create->fbase / create->fincr); |
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rc->reaction_delay_factor = (param->reaction_delay_factor > 0) ? param->reaction_delay_factor : DEFAULT_DELAY_FACTOR; |
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rc->averaging_period = (param->averaging_period > 0) ? param->averaging_period : DEFAULT_AVERAGING_PERIOD; |
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rc->buffer = (param->buffer > 0) ? param->buffer : DEFAULT_BUFFER; |
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rc->time = 0; |
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rc->total_size = 0; |
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rc->rtn_quant = get_initial_quant(param->bitrate); |
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/* Reset quant error accumulators */ |
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for (i = 0; i < 31; i++) |
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rc->quant_error[i] = 0.0; |
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|
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/* Last bunch of variables */ |
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rc->sequence_quality = 2.0 / (double) rc->rtn_quant; |
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rc->avg_framesize = rc->target_framesize; |
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rc->fq_error = 0; |
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/* Bind the RC */ |
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*handle = rc; |
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/* A bit of debug info */ |
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DPRINTF(XVID_DEBUG_RC, "bytes_per_sec: %i\n", rc->bytes_per_sec); |
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DPRINTF(XVID_DEBUG_RC, "frame rate : %f\n", (double) create->fbase / create->fincr); |
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DPRINTF(XVID_DEBUG_RC, "target_framesize: %f\n", rc->target_framesize); |
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return (0); |
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} |
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static int |
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rc_single_destroy(rc_single_t * rc, |
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xvid_plg_destroy_t * destroy) |
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{ |
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free(rc); |
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return (0); |
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} |
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static int |
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rc_single_before(rc_single_t * rc, |
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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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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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int q = rc->rtn_quant; |
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/* limit to min/max range |
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we don't know frame type of the next frame, so we just use |
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P-VOP's range... */ |
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if (q > data->max_quant[XVID_TYPE_PVOP-1]) |
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q = data->max_quant[XVID_TYPE_PVOP-1]; |
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else if (q < data->min_quant[XVID_TYPE_PVOP-1]) |
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q = data->min_quant[XVID_TYPE_PVOP-1]; |
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data->quant = q; |
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} |
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} |
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return 0; |
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} |
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static int |
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rc_single_after(rc_single_t * rc, |
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xvid_plg_data_t * data) |
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{ |
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int64_t deviation; |
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int rtn_quant; |
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double overflow; |
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double averaging_period; |
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double reaction_delay_factor; |
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double quality_scale; |
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double base_quality; |
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double target_quality; |
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/* Update internal values */ |
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rc->time += (double) data->fincr / data->fbase; |
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rc->total_size += data->length; |
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if(data->type == XVID_TYPE_BVOP) |
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return (0); |
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rc->rtn_quant = data->quant; |
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/* Compute the deviation from expected total size */ |
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deviation = |
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rc->total_size - rc->bytes_per_sec * rc->time; |
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if (data->quant >= 2) { |
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averaging_period = (double) rc->averaging_period; |
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rc->sequence_quality -= rc->sequence_quality / averaging_period; |
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rc->sequence_quality += |
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2.0 / (double) data->quant / averaging_period; |
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if (rc->sequence_quality < 0.1) |
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rc->sequence_quality = 0.1; |
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if (data->type != XVID_TYPE_IVOP) { |
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reaction_delay_factor = (double) rc->reaction_delay_factor; |
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rc->avg_framesize -= rc->avg_framesize / reaction_delay_factor; |
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rc->avg_framesize += data->length / reaction_delay_factor; |
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} |
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} |
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quality_scale = |
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rc->target_framesize / rc->avg_framesize * rc->target_framesize / |
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rc->avg_framesize; |
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base_quality = rc->sequence_quality; |
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if (quality_scale >= 1.0) { |
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base_quality = 1.0 - (1.0 - base_quality) / quality_scale; |
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} else { |
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base_quality = 0.06452 + (base_quality - 0.06452) * quality_scale; |
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} |
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overflow = -((double) deviation / (double) rc->buffer); |
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target_quality = |
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base_quality + (base_quality - |
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0.06452) * overflow / rc->target_framesize; |
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if (target_quality > 2.0) |
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target_quality = 2.0; |
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else if (target_quality < 0.06452) |
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target_quality = 0.06452; |
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rtn_quant = (int) (2.0 / target_quality); |
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if (rtn_quant > 0 && rtn_quant < 31) { |
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rc->quant_error[rtn_quant - 1] += 2.0 / target_quality - rtn_quant; |
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if (rc->quant_error[rtn_quant - 1] >= 1.0) { |
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rc->quant_error[rtn_quant - 1] -= 1.0; |
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rtn_quant++; |
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} |
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} |
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/* prevent rapid quantization change */ |
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if (rtn_quant > data->quant + 1) |
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rtn_quant = data->quant + 1; |
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else if (rtn_quant < data->quant - 1) |
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rtn_quant = data->quant - 1; |
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rc->rtn_quant = rtn_quant; |
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return (0); |
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} |
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int |
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xvid_plugin_single(void *handle, |
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int opt, |
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void *param1, |
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void *param2) |
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{ |
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switch (opt) { |
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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_single_create((xvid_plg_create_t *) param1, param2); |
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case XVID_PLG_DESTROY: |
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return rc_single_destroy((rc_single_t *) handle,(xvid_plg_destroy_t *) param1); |
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case XVID_PLG_BEFORE: |
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return rc_single_before((rc_single_t *) handle, (xvid_plg_data_t *) param1); |
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case XVID_PLG_AFTER: |
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return rc_single_after((rc_single_t *) handle, (xvid_plg_data_t *) param1); |
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} |
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return XVID_ERR_FAIL; |
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} |