FFmpeg: libavcodec/libxvidff.c Source File

00001 /*
00002  * Interface to xvidcore for mpeg4 encoding
00003  * Copyright (c) 2004 Adam Thayer <krevnik@comcast.net>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #include <xvid.h>
00029 #include <unistd.h>
00030 #include "avcodec.h"
00031 #include "libavutil/intreadwrite.h"
00032 #include "libxvid_internal.h"
00033 
00037 #define BUFFER_SIZE                 1024
00038 #define BUFFER_REMAINING(x)         (BUFFER_SIZE - strlen(x))
00039 #define BUFFER_CAT(x)               (&((x)[strlen(x)]))
00040 
00041 /* For PPC Use */
00042 int has_altivec(void);
00043 
00048 struct xvid_context {
00049     void *encoder_handle;          
00050     int xsize, ysize;              
00051     int vop_flags;                 
00052     int vol_flags;                 
00053     int me_flags;                  
00054     int qscale;                    
00055     int quicktime_format;          
00056     AVFrame encoded_picture;       
00057     char *twopassbuffer;           
00058     char *old_twopassbuffer;       
00059     char *twopassfile;             
00060     unsigned char *intra_matrix;   
00061     unsigned char *inter_matrix;   
00062 };
00063 
00067 struct xvid_ff_pass1 {
00068     int     version;                
00069     struct xvid_context *context;        
00070 };
00071 
00072 /* Prototypes - See function implementation for details */
00073 int xvid_strip_vol_header(AVCodecContext *avctx, unsigned char *frame, unsigned int header_len, unsigned int frame_len);
00074 int xvid_ff_2pass(void *ref, int opt, void *p1, void *p2);
00075 void xvid_correct_framerate(AVCodecContext *avctx);
00076 
00085 av_cold int ff_xvid_encode_init(AVCodecContext *avctx)  {
00086     int xerr, i;
00087     int xvid_flags = avctx->flags;
00088     struct xvid_context *x = avctx->priv_data;
00089     uint16_t *intra, *inter;
00090     int fd;
00091 
00092     xvid_plugin_single_t single;
00093     struct xvid_ff_pass1 rc2pass1;
00094     xvid_plugin_2pass2_t rc2pass2;
00095     xvid_gbl_init_t xvid_gbl_init;
00096     xvid_enc_create_t xvid_enc_create;
00097     xvid_enc_plugin_t plugins[7];
00098 
00099     /* Bring in VOP flags from ffmpeg command-line */
00100     x->vop_flags = XVID_VOP_HALFPEL; /* Bare minimum quality */
00101     if( xvid_flags & CODEC_FLAG_4MV )
00102         x->vop_flags |= XVID_VOP_INTER4V; /* Level 3 */
00103     if( avctx->trellis
00104         )
00105         x->vop_flags |= XVID_VOP_TRELLISQUANT; /* Level 5 */
00106     if( xvid_flags & CODEC_FLAG_AC_PRED )
00107         x->vop_flags |= XVID_VOP_HQACPRED; /* Level 6 */
00108     if( xvid_flags & CODEC_FLAG_GRAY )
00109         x->vop_flags |= XVID_VOP_GREYSCALE;
00110 
00111     /* Decide which ME quality setting to use */
00112     x->me_flags = 0;
00113     switch( avctx->me_method ) {
00114        case ME_FULL:   /* Quality 6 */
00115            x->me_flags |=  XVID_ME_EXTSEARCH16
00116                        |   XVID_ME_EXTSEARCH8;
00117 
00118        case ME_EPZS:   /* Quality 4 */
00119            x->me_flags |=  XVID_ME_ADVANCEDDIAMOND8
00120                        |   XVID_ME_HALFPELREFINE8
00121                        |   XVID_ME_CHROMA_PVOP
00122                        |   XVID_ME_CHROMA_BVOP;
00123 
00124        case ME_LOG:    /* Quality 2 */
00125        case ME_PHODS:
00126        case ME_X1:
00127            x->me_flags |=  XVID_ME_ADVANCEDDIAMOND16
00128                        |   XVID_ME_HALFPELREFINE16;
00129 
00130        case ME_ZERO:   /* Quality 0 */
00131        default:
00132            break;
00133     }
00134 
00135     /* Decide how we should decide blocks */
00136     switch( avctx->mb_decision ) {
00137        case 2:
00138            x->vop_flags |= XVID_VOP_MODEDECISION_RD;
00139            x->me_flags |=  XVID_ME_HALFPELREFINE8_RD
00140                        |   XVID_ME_QUARTERPELREFINE8_RD
00141                        |   XVID_ME_EXTSEARCH_RD
00142                        |   XVID_ME_CHECKPREDICTION_RD;
00143        case 1:
00144            if( !(x->vop_flags & XVID_VOP_MODEDECISION_RD) )
00145                x->vop_flags |= XVID_VOP_FAST_MODEDECISION_RD;
00146            x->me_flags |=  XVID_ME_HALFPELREFINE16_RD
00147                        |   XVID_ME_QUARTERPELREFINE16_RD;
00148 
00149        default:
00150            break;
00151     }
00152 
00153     /* Bring in VOL flags from ffmpeg command-line */
00154     x->vol_flags = 0;
00155     if( xvid_flags & CODEC_FLAG_GMC ) {
00156         x->vol_flags |= XVID_VOL_GMC;
00157         x->me_flags |= XVID_ME_GME_REFINE;
00158     }
00159     if( xvid_flags & CODEC_FLAG_QPEL ) {
00160         x->vol_flags |= XVID_VOL_QUARTERPEL;
00161         x->me_flags |= XVID_ME_QUARTERPELREFINE16;
00162         if( x->vop_flags & XVID_VOP_INTER4V )
00163             x->me_flags |= XVID_ME_QUARTERPELREFINE8;
00164     }
00165 
00166     memset(&xvid_gbl_init, 0, sizeof(xvid_gbl_init));
00167     xvid_gbl_init.version = XVID_VERSION;
00168     xvid_gbl_init.debug = 0;
00169 
00170 #if ARCH_PPC
00171     /* Xvid's PPC support is borked, use libavcodec to detect */
00172 #if HAVE_ALTIVEC
00173     if( has_altivec() ) {
00174         xvid_gbl_init.cpu_flags = XVID_CPU_FORCE | XVID_CPU_ALTIVEC;
00175     } else
00176 #endif
00177         xvid_gbl_init.cpu_flags = XVID_CPU_FORCE;
00178 #else
00179     /* Xvid can detect on x86 */
00180     xvid_gbl_init.cpu_flags = 0;
00181 #endif
00182 
00183     /* Initialize */
00184     xvid_global(NULL, XVID_GBL_INIT, &xvid_gbl_init, NULL);
00185 
00186     /* Create the encoder reference */
00187     memset(&xvid_enc_create, 0, sizeof(xvid_enc_create));
00188     xvid_enc_create.version = XVID_VERSION;
00189 
00190     /* Store the desired frame size */
00191     xvid_enc_create.width = x->xsize = avctx->width;
00192     xvid_enc_create.height = x->ysize = avctx->height;
00193 
00194     /* Xvid can determine the proper profile to use */
00195     /* xvid_enc_create.profile = XVID_PROFILE_S_L3; */
00196 
00197     /* We don't use zones */
00198     xvid_enc_create.zones = NULL;
00199     xvid_enc_create.num_zones = 0;
00200 
00201     xvid_enc_create.num_threads = avctx->thread_count;
00202 
00203     xvid_enc_create.plugins = plugins;
00204     xvid_enc_create.num_plugins = 0;
00205 
00206     /* Initialize Buffers */
00207     x->twopassbuffer = NULL;
00208     x->old_twopassbuffer = NULL;
00209     x->twopassfile = NULL;
00210 
00211     if( xvid_flags & CODEC_FLAG_PASS1 ) {
00212         memset(&rc2pass1, 0, sizeof(struct xvid_ff_pass1));
00213         rc2pass1.version = XVID_VERSION;
00214         rc2pass1.context = x;
00215         x->twopassbuffer = av_malloc(BUFFER_SIZE);
00216         x->old_twopassbuffer = av_malloc(BUFFER_SIZE);
00217         if( x->twopassbuffer == NULL || x->old_twopassbuffer == NULL ) {
00218             av_log(avctx, AV_LOG_ERROR,
00219                 "Xvid: Cannot allocate 2-pass log buffers\n");
00220             return -1;
00221         }
00222         x->twopassbuffer[0] = x->old_twopassbuffer[0] = 0;
00223 
00224         plugins[xvid_enc_create.num_plugins].func = xvid_ff_2pass;
00225         plugins[xvid_enc_create.num_plugins].param = &rc2pass1;
00226         xvid_enc_create.num_plugins++;
00227     } else if( xvid_flags & CODEC_FLAG_PASS2 ) {
00228         memset(&rc2pass2, 0, sizeof(xvid_plugin_2pass2_t));
00229         rc2pass2.version = XVID_VERSION;
00230         rc2pass2.bitrate = avctx->bit_rate;
00231 
00232         fd = av_tempfile("xvidff.", &(x->twopassfile));
00233         if( fd == -1 ) {
00234             av_log(avctx, AV_LOG_ERROR,
00235                 "Xvid: Cannot write 2-pass pipe\n");
00236             return -1;
00237         }
00238 
00239         if( avctx->stats_in == NULL ) {
00240             av_log(avctx, AV_LOG_ERROR,
00241                 "Xvid: No 2-pass information loaded for second pass\n");
00242             return -1;
00243         }
00244 
00245         if( strlen(avctx->stats_in) >
00246               write(fd, avctx->stats_in, strlen(avctx->stats_in)) ) {
00247             close(fd);
00248             av_log(avctx, AV_LOG_ERROR,
00249                 "Xvid: Cannot write to 2-pass pipe\n");
00250             return -1;
00251         }
00252 
00253         close(fd);
00254         rc2pass2.filename = x->twopassfile;
00255         plugins[xvid_enc_create.num_plugins].func = xvid_plugin_2pass2;
00256         plugins[xvid_enc_create.num_plugins].param = &rc2pass2;
00257         xvid_enc_create.num_plugins++;
00258     } else if( !(xvid_flags & CODEC_FLAG_QSCALE) ) {
00259         /* Single Pass Bitrate Control! */
00260         memset(&single, 0, sizeof(xvid_plugin_single_t));
00261         single.version = XVID_VERSION;
00262         single.bitrate = avctx->bit_rate;
00263 
00264         plugins[xvid_enc_create.num_plugins].func = xvid_plugin_single;
00265         plugins[xvid_enc_create.num_plugins].param = &single;
00266         xvid_enc_create.num_plugins++;
00267     }
00268 
00269     /* Luminance Masking */
00270     if( 0.0 != avctx->lumi_masking ) {
00271         plugins[xvid_enc_create.num_plugins].func = xvid_plugin_lumimasking;
00272         plugins[xvid_enc_create.num_plugins].param = NULL;
00273         xvid_enc_create.num_plugins++;
00274     }
00275 
00276     /* Frame Rate and Key Frames */
00277     xvid_correct_framerate(avctx);
00278     xvid_enc_create.fincr = avctx->time_base.num;
00279     xvid_enc_create.fbase = avctx->time_base.den;
00280     if( avctx->gop_size > 0 )
00281         xvid_enc_create.max_key_interval = avctx->gop_size;
00282     else
00283         xvid_enc_create.max_key_interval = 240; /* Xvid's best default */
00284 
00285     /* Quants */
00286     if( xvid_flags & CODEC_FLAG_QSCALE ) x->qscale = 1;
00287     else x->qscale = 0;
00288 
00289     xvid_enc_create.min_quant[0] = avctx->qmin;
00290     xvid_enc_create.min_quant[1] = avctx->qmin;
00291     xvid_enc_create.min_quant[2] = avctx->qmin;
00292     xvid_enc_create.max_quant[0] = avctx->qmax;
00293     xvid_enc_create.max_quant[1] = avctx->qmax;
00294     xvid_enc_create.max_quant[2] = avctx->qmax;
00295 
00296     /* Quant Matrices */
00297     x->intra_matrix = x->inter_matrix = NULL;
00298     if( avctx->mpeg_quant )
00299        x->vol_flags |= XVID_VOL_MPEGQUANT;
00300     if( (avctx->intra_matrix || avctx->inter_matrix) ) {
00301        x->vol_flags |= XVID_VOL_MPEGQUANT;
00302 
00303        if( avctx->intra_matrix ) {
00304            intra = avctx->intra_matrix;
00305            x->intra_matrix = av_malloc(sizeof(unsigned char) * 64);
00306        } else
00307            intra = NULL;
00308        if( avctx->inter_matrix ) {
00309            inter = avctx->inter_matrix;
00310            x->inter_matrix = av_malloc(sizeof(unsigned char) * 64);
00311        } else
00312            inter = NULL;
00313 
00314        for( i = 0; i < 64; i++ ) {
00315            if( intra )
00316                x->intra_matrix[i] = (unsigned char)intra[i];
00317            if( inter )
00318                x->inter_matrix[i] = (unsigned char)inter[i];
00319        }
00320     }
00321 
00322     /* Misc Settings */
00323     xvid_enc_create.frame_drop_ratio = 0;
00324     xvid_enc_create.global = 0;
00325     if( xvid_flags & CODEC_FLAG_CLOSED_GOP )
00326         xvid_enc_create.global |= XVID_GLOBAL_CLOSED_GOP;
00327 
00328     /* Determines which codec mode we are operating in */
00329     avctx->extradata = NULL;
00330     avctx->extradata_size = 0;
00331     if( xvid_flags & CODEC_FLAG_GLOBAL_HEADER ) {
00332         /* In this case, we are claiming to be MPEG4 */
00333         x->quicktime_format = 1;
00334         avctx->codec_id = CODEC_ID_MPEG4;
00335     } else {
00336         /* We are claiming to be Xvid */
00337         x->quicktime_format = 0;
00338         if(!avctx->codec_tag)
00339             avctx->codec_tag = AV_RL32("xvid");
00340     }
00341 
00342     /* Bframes */
00343     xvid_enc_create.max_bframes = avctx->max_b_frames;
00344     xvid_enc_create.bquant_offset = 100 * avctx->b_quant_offset;
00345     xvid_enc_create.bquant_ratio = 100 * avctx->b_quant_factor;
00346     if( avctx->max_b_frames > 0  && !x->quicktime_format ) xvid_enc_create.global |= XVID_GLOBAL_PACKED;
00347 
00348     /* Create encoder context */
00349     xerr = xvid_encore(NULL, XVID_ENC_CREATE, &xvid_enc_create, NULL);
00350     if( xerr ) {
00351         av_log(avctx, AV_LOG_ERROR, "Xvid: Could not create encoder reference\n");
00352         return -1;
00353     }
00354 
00355     x->encoder_handle = xvid_enc_create.handle;
00356     avctx->coded_frame = &x->encoded_picture;
00357 
00358     return 0;
00359 }
00360 
00370 int ff_xvid_encode_frame(AVCodecContext *avctx,
00371                          unsigned char *frame, int buf_size, void *data) {
00372     int xerr, i;
00373     char *tmp;
00374     struct xvid_context *x = avctx->priv_data;
00375     AVFrame *picture = data;
00376     AVFrame *p = &(x->encoded_picture);
00377 
00378     xvid_enc_frame_t xvid_enc_frame;
00379     xvid_enc_stats_t xvid_enc_stats;
00380 
00381     /* Start setting up the frame */
00382     memset(&xvid_enc_frame, 0, sizeof(xvid_enc_frame));
00383     xvid_enc_frame.version = XVID_VERSION;
00384     memset(&xvid_enc_stats, 0, sizeof(xvid_enc_stats));
00385     xvid_enc_stats.version = XVID_VERSION;
00386     *p = *picture;
00387 
00388     /* Let Xvid know where to put the frame. */
00389     xvid_enc_frame.bitstream = frame;
00390     xvid_enc_frame.length = buf_size;
00391 
00392     /* Initialize input image fields */
00393     if( avctx->pix_fmt != PIX_FMT_YUV420P ) {
00394         av_log(avctx, AV_LOG_ERROR, "Xvid: Color spaces other than 420p not supported\n");
00395         return -1;
00396     }
00397 
00398     xvid_enc_frame.input.csp = XVID_CSP_PLANAR; /* YUV420P */
00399 
00400     for( i = 0; i < 4; i++ ) {
00401         xvid_enc_frame.input.plane[i] = picture->data[i];
00402         xvid_enc_frame.input.stride[i] = picture->linesize[i];
00403     }
00404 
00405     /* Encoder Flags */
00406     xvid_enc_frame.vop_flags = x->vop_flags;
00407     xvid_enc_frame.vol_flags = x->vol_flags;
00408     xvid_enc_frame.motion = x->me_flags;
00409     xvid_enc_frame.type = XVID_TYPE_AUTO;
00410 
00411     /* Pixel aspect ratio setting */
00412     if (avctx->sample_aspect_ratio.num < 1 || avctx->sample_aspect_ratio.num > 255 ||
00413         avctx->sample_aspect_ratio.den < 1 || avctx->sample_aspect_ratio.den > 255) {
00414         av_log(avctx, AV_LOG_ERROR, "Invalid pixel aspect ratio %i/%i\n",
00415                avctx->sample_aspect_ratio.num, avctx->sample_aspect_ratio.den);
00416         return -1;
00417     }
00418     xvid_enc_frame.par = XVID_PAR_EXT;
00419     xvid_enc_frame.par_width  = avctx->sample_aspect_ratio.num;
00420     xvid_enc_frame.par_height = avctx->sample_aspect_ratio.den;
00421 
00422     /* Quant Setting */
00423     if( x->qscale ) xvid_enc_frame.quant = picture->quality / FF_QP2LAMBDA;
00424     else xvid_enc_frame.quant = 0;
00425 
00426     /* Matrices */
00427     xvid_enc_frame.quant_intra_matrix = x->intra_matrix;
00428     xvid_enc_frame.quant_inter_matrix = x->inter_matrix;
00429 
00430     /* Encode */
00431     xerr = xvid_encore(x->encoder_handle, XVID_ENC_ENCODE,
00432         &xvid_enc_frame, &xvid_enc_stats);
00433 
00434     /* Two-pass log buffer swapping */
00435     avctx->stats_out = NULL;
00436     if( x->twopassbuffer ) {
00437         tmp = x->old_twopassbuffer;
00438         x->old_twopassbuffer = x->twopassbuffer;
00439         x->twopassbuffer = tmp;
00440         x->twopassbuffer[0] = 0;
00441         if( x->old_twopassbuffer[0] != 0 ) {
00442             avctx->stats_out = x->old_twopassbuffer;
00443         }
00444     }
00445 
00446     if( 0 <= xerr ) {
00447         p->quality = xvid_enc_stats.quant * FF_QP2LAMBDA;
00448         if( xvid_enc_stats.type == XVID_TYPE_PVOP )
00449             p->pict_type = FF_P_TYPE;
00450         else if( xvid_enc_stats.type == XVID_TYPE_BVOP )
00451             p->pict_type = FF_B_TYPE;
00452         else if( xvid_enc_stats.type == XVID_TYPE_SVOP )
00453             p->pict_type = FF_S_TYPE;
00454         else
00455             p->pict_type = FF_I_TYPE;
00456         if( xvid_enc_frame.out_flags & XVID_KEYFRAME ) {
00457             p->key_frame = 1;
00458             if( x->quicktime_format )
00459                 return xvid_strip_vol_header(avctx, frame,
00460                     xvid_enc_stats.hlength, xerr);
00461          } else
00462             p->key_frame = 0;
00463 
00464         return xerr;
00465     } else {
00466         av_log(avctx, AV_LOG_ERROR, "Xvid: Encoding Error Occurred: %i\n", xerr);
00467         return -1;
00468     }
00469 }
00470 
00478 av_cold int ff_xvid_encode_close(AVCodecContext *avctx) {
00479     struct xvid_context *x = avctx->priv_data;
00480 
00481     xvid_encore(x->encoder_handle, XVID_ENC_DESTROY, NULL, NULL);
00482 
00483     if( avctx->extradata != NULL )
00484         av_free(avctx->extradata);
00485     if( x->twopassbuffer != NULL ) {
00486         av_free(x->twopassbuffer);
00487         av_free(x->old_twopassbuffer);
00488         avctx->stats_out = NULL;
00489     }
00490     if( x->twopassfile != NULL )
00491         av_free(x->twopassfile);
00492     if( x->intra_matrix != NULL )
00493         av_free(x->intra_matrix);
00494     if( x->inter_matrix != NULL )
00495         av_free(x->inter_matrix);
00496 
00497     return 0;
00498 }
00499 
00513 int xvid_strip_vol_header(AVCodecContext *avctx,
00514                   unsigned char *frame,
00515                   unsigned int header_len,
00516                   unsigned int frame_len) {
00517     int vo_len = 0, i;
00518 
00519     for( i = 0; i < header_len - 3; i++ ) {
00520         if( frame[i] == 0x00 &&
00521             frame[i+1] == 0x00 &&
00522             frame[i+2] == 0x01 &&
00523             frame[i+3] == 0xB6 ) {
00524             vo_len = i;
00525             break;
00526         }
00527     }
00528 
00529     if( vo_len > 0 ) {
00530         /* We need to store the header, so extract it */
00531         if( avctx->extradata == NULL ) {
00532             avctx->extradata = av_malloc(vo_len);
00533             memcpy(avctx->extradata, frame, vo_len);
00534             avctx->extradata_size = vo_len;
00535         }
00536         /* Less dangerous now, memmove properly copies the two
00537            chunks of overlapping data */
00538         memmove(frame, &(frame[vo_len]), frame_len - vo_len);
00539         return frame_len - vo_len;
00540     } else
00541         return frame_len;
00542 }
00543 
00553 void xvid_correct_framerate(AVCodecContext *avctx) {
00554     int frate, fbase;
00555     int est_frate, est_fbase;
00556     int gcd;
00557     float est_fps, fps;
00558 
00559     frate = avctx->time_base.den;
00560     fbase = avctx->time_base.num;
00561 
00562     gcd = av_gcd(frate, fbase);
00563     if( gcd > 1 ) {
00564         frate /= gcd;
00565         fbase /= gcd;
00566     }
00567 
00568     if( frate <= 65000 && fbase <= 65000 ) {
00569         avctx->time_base.den = frate;
00570         avctx->time_base.num = fbase;
00571         return;
00572     }
00573 
00574     fps = (float)frate / (float)fbase;
00575     est_fps = roundf(fps * 1000.0) / 1000.0;
00576 
00577     est_frate = (int)est_fps;
00578     if( est_fps > (int)est_fps ) {
00579         est_frate = (est_frate + 1) * 1000;
00580         est_fbase = (int)roundf((float)est_frate / est_fps);
00581     } else
00582         est_fbase = 1;
00583 
00584     gcd = av_gcd(est_frate, est_fbase);
00585     if( gcd > 1 ) {
00586         est_frate /= gcd;
00587         est_fbase /= gcd;
00588     }
00589 
00590     if( fbase > est_fbase ) {
00591         avctx->time_base.den = est_frate;
00592         avctx->time_base.num = est_fbase;
00593         av_log(avctx, AV_LOG_DEBUG,
00594             "Xvid: framerate re-estimated: %.2f, %.3f%% correction\n",
00595             est_fps, (((est_fps - fps)/fps) * 100.0));
00596     } else {
00597         avctx->time_base.den = frate;
00598         avctx->time_base.num = fbase;
00599     }
00600 }
00601 
00602 /*
00603  * Xvid 2-Pass Kludge Section
00604  *
00605  * Xvid's default 2-pass doesn't allow us to create data as we need to, so
00606  * this section spends time replacing the first pass plugin so we can write
00607  * statistic information as libavcodec requests in. We have another kludge
00608  * that allows us to pass data to the second pass in Xvid without a custom
00609  * rate-control plugin.
00610  */
00611 
00619 static int xvid_ff_2pass_create(xvid_plg_create_t * param,
00620                                 void ** handle) {
00621     struct xvid_ff_pass1 *x = (struct xvid_ff_pass1 *)param->param;
00622     char *log = x->context->twopassbuffer;
00623 
00624     /* Do a quick bounds check */
00625     if( log == NULL )
00626         return XVID_ERR_FAIL;
00627 
00628     /* We use snprintf() */
00629     /* This is because we can safely prevent a buffer overflow */
00630     log[0] = 0;
00631     snprintf(log, BUFFER_REMAINING(log),
00632         "# ffmpeg 2-pass log file, using xvid codec\n");
00633     snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
00634         "# Do not modify. libxvidcore version: %d.%d.%d\n\n",
00635         XVID_VERSION_MAJOR(XVID_VERSION),
00636         XVID_VERSION_MINOR(XVID_VERSION),
00637         XVID_VERSION_PATCH(XVID_VERSION));
00638 
00639     *handle = x->context;
00640     return 0;
00641 }
00642 
00650 static int xvid_ff_2pass_destroy(struct xvid_context *ref,
00651                                 xvid_plg_destroy_t *param) {
00652     /* Currently cannot think of anything to do on destruction */
00653     /* Still, the framework should be here for reference/use */
00654     if( ref->twopassbuffer != NULL )
00655         ref->twopassbuffer[0] = 0;
00656     return 0;
00657 }
00658 
00666 static int xvid_ff_2pass_before(struct xvid_context *ref,
00667                                 xvid_plg_data_t *param) {
00668     int motion_remove;
00669     int motion_replacements;
00670     int vop_remove;
00671 
00672     /* Nothing to do here, result is changed too much */
00673     if( param->zone && param->zone->mode == XVID_ZONE_QUANT )
00674         return 0;
00675 
00676     /* We can implement a 'turbo' first pass mode here */
00677     param->quant = 2;
00678 
00679     /* Init values */
00680     motion_remove = ~XVID_ME_CHROMA_PVOP &
00681                     ~XVID_ME_CHROMA_BVOP &
00682                     ~XVID_ME_EXTSEARCH16 &
00683                     ~XVID_ME_ADVANCEDDIAMOND16;
00684     motion_replacements = XVID_ME_FAST_MODEINTERPOLATE |
00685                           XVID_ME_SKIP_DELTASEARCH |
00686                           XVID_ME_FASTREFINE16 |
00687                           XVID_ME_BFRAME_EARLYSTOP;
00688     vop_remove = ~XVID_VOP_MODEDECISION_RD &
00689                  ~XVID_VOP_FAST_MODEDECISION_RD &
00690                  ~XVID_VOP_TRELLISQUANT &
00691                  ~XVID_VOP_INTER4V &
00692                  ~XVID_VOP_HQACPRED;
00693 
00694     param->vol_flags &= ~XVID_VOL_GMC;
00695     param->vop_flags &= vop_remove;
00696     param->motion_flags &= motion_remove;
00697     param->motion_flags |= motion_replacements;
00698 
00699     return 0;
00700 }
00701 
00709 static int xvid_ff_2pass_after(struct xvid_context *ref,
00710                                 xvid_plg_data_t *param) {
00711     char *log = ref->twopassbuffer;
00712     char *frame_types = " ipbs";
00713     char frame_type;
00714 
00715     /* Quick bounds check */
00716     if( log == NULL )
00717         return XVID_ERR_FAIL;
00718 
00719     /* Convert the type given to us into a character */
00720     if( param->type < 5 && param->type > 0 ) {
00721         frame_type = frame_types[param->type];
00722     } else {
00723         return XVID_ERR_FAIL;
00724     }
00725 
00726     snprintf(BUFFER_CAT(log), BUFFER_REMAINING(log),
00727         "%c %d %d %d %d %d %d\n",
00728         frame_type, param->stats.quant, param->stats.kblks, param->stats.mblks,
00729         param->stats.ublks, param->stats.length, param->stats.hlength);
00730 
00731     return 0;
00732 }
00733 
00745 int xvid_ff_2pass(void *ref, int cmd, void *p1, void *p2) {
00746     switch( cmd ) {
00747         case XVID_PLG_INFO:
00748         case XVID_PLG_FRAME:
00749             return 0;
00750 
00751         case XVID_PLG_BEFORE:
00752             return xvid_ff_2pass_before(ref, p1);
00753 
00754         case XVID_PLG_CREATE:
00755             return xvid_ff_2pass_create(p1, p2);
00756 
00757         case XVID_PLG_AFTER:
00758             return xvid_ff_2pass_after(ref, p1);
00759 
00760         case XVID_PLG_DESTROY:
00761             return xvid_ff_2pass_destroy(ref, p1);
00762 
00763         default:
00764             return XVID_ERR_FAIL;
00765     }
00766 }
00767 
00771 AVCodec libxvid_encoder = {
00772     "libxvid",
00773     CODEC_TYPE_VIDEO,
00774     CODEC_ID_XVID,
00775     sizeof(struct xvid_context),
00776     ff_xvid_encode_init,
00777     ff_xvid_encode_frame,
00778     ff_xvid_encode_close,
00779     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00780     .long_name= NULL_IF_CONFIG_SMALL("libxvidcore MPEG-4 part 2"),
00781 };