mirror of https://github.com/mpv-player/mpv
406 lines
10 KiB
C
406 lines
10 KiB
C
/*
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* divx4_vbr.c
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file COPYING in the main directory of the Linux
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* distribution for more details.
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*
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* 2-pass code OpenDivX port:
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* Copyright (C) 2001 Christoph Lampert <gruel@gmx.de>
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*
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* Large parts of this code were taken from VbrControl() from the OpenDivX
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* project, (C) divxnetworks, written by Eugene Kuznetsov <ekuznetsov@divxnetworks.com>
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* with the permission of Darrius "Junto" Thompson, Director DivX
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <math.h>
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#include <inttypes.h>
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#include "divx4_vbr.h"
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//#include "transcode.h"
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#define FALSE 0
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#define TRUE 1
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/* Absolute maximum and minimum quantizers used in VBR modes */
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static const int min_quantizer=1;
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static const int max_quantizer=31;
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/* Limits on frame-level deviation of quantizer ( higher values
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correspond to frames with more changes and vice versa ) */
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static const float min_quant_delta=-10.f;
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static const float max_quant_delta=5.f;
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/* Limits on stream-level deviation of quantizer ( used to make
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overall bitrate of stream close to requested value ) */
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static const float min_rc_quant_delta=.6f;
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static const float max_rc_quant_delta=1.5f;
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/* Crispness parameter controls threshold for decision whether
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to skip the frame or to code it. */
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//static const float max_crispness=100.f;
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/* Maximum allowed number of skipped frames in a line. */
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//static const int max_drops_line=0; // CHL We don't drop frames at the moment!
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typedef struct entry_s
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/* max 28 bytes/frame or 5 Mb for 2-hour movie */
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{
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int quant;
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int text_bits;
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int motion_bits;
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int total_bits;
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float mult;
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short is_key_frame;
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short drop;
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} entry;
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static int m_iCount;
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static int m_iQuant;
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/*static int m_iCrispness;*/
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static short m_bDrop;
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static float m_fQuant;
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static int64_t m_lEncodedBits;
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static int64_t m_lExpectedBits;
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static FILE *m_pFile;
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static entry vFrame;
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static entry *m_vFrames;
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static long lFrameStart;
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static int iNumFrames;
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static int dummy;
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void VbrControl_init_1pass_vbr(int quality, int crispness)
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{
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m_fQuant=min_quantizer+((max_quantizer-min_quantizer)/6.)*(6-quality);
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m_iCount=0;
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m_bDrop=FALSE;
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VbrControl_update_1pass_vbr();
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}
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int VbrControl_init_2pass_vbr_analysis(const char *filename, int quality)
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{
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m_pFile=fopen(filename, "wb");
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if(m_pFile==0)
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return -1;
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m_iCount=0;
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m_bDrop=FALSE;
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fprintf(m_pFile, "##version 1\n");
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fprintf(m_pFile, "quality %d\n", quality);
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return 0;
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}
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int VbrControl_init_2pass_vbr_encoding(const char *filename, int bitrate, double framerate, int crispness, int quality)
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{
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int i;
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int64_t text_bits=0;
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int64_t total_bits=0;
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int64_t complexity=0;
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int64_t new_complexity=0;
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int64_t motion_bits=0;
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int64_t denominator=0;
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float qual_multiplier=1.;
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char head[20];
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int64_t desired_bits;
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int64_t non_text_bits;
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float average_complexity;
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m_pFile=fopen(filename, "rb");
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if(m_pFile==0)
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return -1;
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m_bDrop=FALSE;
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m_iCount=0;
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fread(head, 10, 1, m_pFile);
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if(!strncmp("##version ", head, 10))
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{
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int version;
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int iOldQual;
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float old_qual, new_qual;
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fscanf(m_pFile, "%d\n", &version);
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fscanf(m_pFile, "quality %d\n", &iOldQual);
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switch(iOldQual)
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{
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case 5:
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old_qual=1.f;
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break;
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case 4:
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old_qual=1.1f;
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break;
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case 3:
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old_qual=1.25f;
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break;
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case 2:
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old_qual=1.4f;
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break;
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case 1:
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old_qual=2.f;
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break;
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}
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switch(quality)
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{
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case 5:
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new_qual=1.f;
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break;
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case 4:
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new_qual=1.1f;
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break;
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case 3:
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new_qual=1.25f;
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break;
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case 2:
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new_qual=1.4f;
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break;
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case 1:
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new_qual=2.f;
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break;
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}
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qual_multiplier=new_qual/old_qual;
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}
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else
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fseek(m_pFile, 0, SEEK_SET);
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lFrameStart=ftell(m_pFile); // save current position
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/* removed C++ dependencies, now read file twice :-( */
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while(!feof(m_pFile))
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{ fscanf(m_pFile, "Frame %d: intra %hd, quant %d, texture %d, motion %d, total %d\n",
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&iNumFrames, &(vFrame.is_key_frame), &(vFrame.quant), &(vFrame.text_bits), &(vFrame.motion_bits), &(vFrame.total_bits));
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vFrame.total_bits+=vFrame.text_bits*(qual_multiplier-1);
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vFrame.text_bits*=qual_multiplier;
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text_bits +=(int64_t)vFrame.text_bits;
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motion_bits += (int64_t)vFrame.motion_bits;
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total_bits +=(int64_t)vFrame.total_bits;
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complexity +=(int64_t)vFrame.text_bits*vFrame.quant;
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// printf("Frames %d, texture %d, motion %d, quant %d total %d ",
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// iNumFrames, vFrame.text_bits, vFrame.motion_bits, vFrame.quant, vFrame.total_bits);
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// printf("texture %d, total %d, complexity %lld \n",vFrame.text_bits,vFrame.total_bits, complexity);
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}
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iNumFrames++;
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average_complexity=complexity/iNumFrames;
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// if (verbose & TC_DEBUG) {
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// fprintf(stderr, "(%s) frames %d, texture %lld, motion %lld, total %lld, complexity %lld\n", __FILE__, iNumFrames, text_bits, motion_bits, total_bits, complexity);
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// }
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m_vFrames = (entry*)malloc(iNumFrames*sizeof(entry));
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if (!m_vFrames)
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{ printf("out of memory");
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return -2; //TC_EXPORT_ERROR;
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}
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fseek(m_pFile, lFrameStart, SEEK_SET); // start again
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for (i=0;i<iNumFrames;i++)
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{ fscanf(m_pFile, "Frame %d: intra %hd, quant %d, texture %d, motion %d, total %d\n",
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&dummy, &(m_vFrames[i].is_key_frame), &(m_vFrames[i].quant),
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&(m_vFrames[i].text_bits), &(m_vFrames[i].motion_bits),
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&(m_vFrames[i].total_bits));
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m_vFrames[i].total_bits += m_vFrames[i].text_bits*(qual_multiplier-1);
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m_vFrames[i].text_bits *= qual_multiplier;
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}
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if (m_pFile)
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{ fclose(m_pFile);
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m_pFile=NULL;
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}
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desired_bits=(int64_t)bitrate*(int64_t)iNumFrames/framerate;
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non_text_bits=total_bits-text_bits;
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if(desired_bits<=non_text_bits)
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{
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/* char s[200];*/
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printf("Specified bitrate is too low for this clip.\n"
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"Minimum possible bitrate for the clip is %.0f kbps. Overriding\n"
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"user-specified value.\n",
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(float)(non_text_bits*framerate/(int64_t)iNumFrames));
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desired_bits=non_text_bits*3/2;
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/*
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m_fQuant=max_quantizer;
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for(int i=0; i<iNumFrames; i++)
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{
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m_vFrames[i].drop=0;
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m_vFrames[i].mult=1;
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}
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VbrControl_set_quant(m_fQuant);
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return 0;
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*/
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}
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desired_bits -= non_text_bits;
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/**
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BRIEF EXPLANATION OF WHAT'S GOING ON HERE.
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We assume that
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text_bits=complexity / quantizer
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total_bits-text_bits = const(complexity)
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where 'complexity' is a characteristic of the frame
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and does not depend much on quantizer dynamics.
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Using this equation, we calculate 'average' quantizer
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to be used for encoding ( 1st order effect ).
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Having constant quantizer for the entire stream is not
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very convenient - reconstruction errors are
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more noticeable in low-motion scenes. To compensate
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this effect, we multiply quantizer for each frame by
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(complexity/average_complexity)^k,
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( k - parameter of adjustment ). k=0 means 'no compensation'
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and k=1 is 'constant bitrate mode'. We choose something in
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between, like 0.5 ( 2nd order effect ).
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**/
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average_complexity=complexity/iNumFrames;
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for(i=0; i<iNumFrames; i++)
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{
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float mult;
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if(m_vFrames[i].is_key_frame)
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{
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if((i+1<iNumFrames) && (m_vFrames[i+1].is_key_frame))
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mult=1.25;
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else
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mult=.75;
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}
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else
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{
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mult=m_vFrames[i].text_bits*m_vFrames[i].quant;
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mult=(float)sqrt(mult/average_complexity);
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// if(i && m_vFrames[i-1].is_key_frame)
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// mult *= 0.75;
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if(mult<0.5)
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mult=0.5;
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if(mult>1.5)
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mult=1.5;
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}
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m_vFrames[i].mult=mult;
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m_vFrames[i].drop=FALSE;
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new_complexity+=m_vFrames[i].text_bits*m_vFrames[i].quant;
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denominator+=desired_bits*m_vFrames[i].mult/iNumFrames;
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}
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m_fQuant=((double)new_complexity)/(double)denominator;
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if(m_fQuant<min_quantizer) m_fQuant=min_quantizer;
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if(m_fQuant>max_quantizer) m_fQuant=max_quantizer;
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m_pFile=fopen("analyse.log", "wb");
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if(m_pFile)
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{
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fprintf(m_pFile, "Total frames: %d Avg quantizer: %f\n",
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iNumFrames, m_fQuant);
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fprintf(m_pFile, "Expecting %12lld bits\n", desired_bits+non_text_bits);
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fflush(m_pFile);
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}
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VbrControl_set_quant(m_fQuant*m_vFrames[0].mult);
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m_lEncodedBits=m_lExpectedBits=0;
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return 0;
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}
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int VbrControl_get_intra()
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{
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return m_vFrames[m_iCount].is_key_frame;
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}
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short VbrControl_get_drop()
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{
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return m_bDrop;
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}
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int VbrControl_get_quant()
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{
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return m_iQuant;
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}
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void VbrControl_set_quant(float quant)
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{
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m_iQuant=quant;
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if((rand() % 10)<((quant-m_iQuant) * 10))
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m_iQuant++;
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if(m_iQuant<min_quantizer) m_iQuant=min_quantizer;
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if(m_iQuant>max_quantizer) m_iQuant=max_quantizer;
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}
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void VbrControl_update_1pass_vbr()
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{
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VbrControl_set_quant(m_fQuant);
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m_iCount++;
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}
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void VbrControl_update_2pass_vbr_analysis(int is_key_frame, int motion_bits, int texture_bits, int total_bits, int quant)
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{
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if(!m_pFile)
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return;
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fprintf(m_pFile, "Frame %d: intra %d, quant %d, texture %d, motion %d, total %d\n",
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m_iCount, is_key_frame, quant, texture_bits, motion_bits, total_bits);
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m_iCount++;
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}
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void VbrControl_update_2pass_vbr_encoding(int motion_bits, int texture_bits, int total_bits)
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{
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double q;
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double dq;
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if(m_iCount>=iNumFrames)
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return;
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m_lExpectedBits+=(m_vFrames[m_iCount].total_bits-m_vFrames[m_iCount].text_bits)
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+ m_vFrames[m_iCount].text_bits*m_vFrames[m_iCount].quant/m_fQuant;
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m_lEncodedBits+=(int64_t)total_bits;
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if(m_pFile)
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fprintf(m_pFile, "Frame %d: PRESENT, complexity %d, quant multiplier %f, texture %d, total %d ",
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m_iCount, m_vFrames[m_iCount].text_bits*m_vFrames[m_iCount].quant,
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m_vFrames[m_iCount].mult, texture_bits, total_bits);
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m_iCount++;
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q = m_fQuant * m_vFrames[m_iCount].mult;
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if(q<m_fQuant+min_quant_delta) q=m_fQuant+min_quant_delta;
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if(q>m_fQuant+max_quant_delta) q=m_fQuant+max_quant_delta;
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dq = (double)m_lEncodedBits/(double)m_lExpectedBits;
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dq*=dq;
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if(dq<min_rc_quant_delta)
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dq=min_rc_quant_delta;
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if(dq>max_rc_quant_delta)
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dq=max_rc_quant_delta;
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if(m_iCount<20) // no framerate corrections in first frames
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dq=1;
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if(m_pFile)
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fprintf(m_pFile, "Progress: expected %12lld, achieved %12lld, dq %f",
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m_lExpectedBits, m_lEncodedBits, dq);
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q *= dq;
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VbrControl_set_quant(q);
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if(m_pFile)
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fprintf(m_pFile, ", new quant %d\n", m_iQuant);
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}
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void VbrControl_close()
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{
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if(m_pFile)
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{
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fclose(m_pFile);
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m_pFile=NULL;
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}
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free(m_vFrames);
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}
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