FFmpeg: libavfilter/avfiltergraph.c Source File

00001 /*
00002  * filter graphs
00003  * Copyright (c) 2008 Vitor Sessak
00004  * Copyright (c) 2007 Bobby Bingham
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include <ctype.h>
00024 #include <string.h>
00025 
00026 #include "libavutil/audioconvert.h"
00027 #include "libavutil/avassert.h"
00028 #include "libavutil/pixdesc.h"
00029 #include "libavcodec/avcodec.h" // avcodec_find_best_pix_fmt_of_2()
00030 #include "avfilter.h"
00031 #include "avfiltergraph.h"
00032 #include "formats.h"
00033 #include "internal.h"
00034 
00035 #include "libavutil/audioconvert.h"
00036 #include "libavutil/avassert.h"
00037 #include "libavutil/common.h"
00038 #include "libavutil/log.h"
00039 
00040 static const AVClass filtergraph_class = {
00041     .class_name = "AVFilterGraph",
00042     .item_name  = av_default_item_name,
00043     .version    = LIBAVUTIL_VERSION_INT,
00044     .category   = AV_CLASS_CATEGORY_FILTER,
00045 };
00046 
00047 AVFilterGraph *avfilter_graph_alloc(void)
00048 {
00049     AVFilterGraph *ret = av_mallocz(sizeof(AVFilterGraph));
00050     if (!ret)
00051         return NULL;
00052     ret->av_class = &filtergraph_class;
00053     return ret;
00054 }
00055 
00056 void avfilter_graph_free(AVFilterGraph **graph)
00057 {
00058     if (!*graph)
00059         return;
00060     for (; (*graph)->filter_count > 0; (*graph)->filter_count--)
00061         avfilter_free((*graph)->filters[(*graph)->filter_count - 1]);
00062     av_freep(&(*graph)->sink_links);
00063     av_freep(&(*graph)->scale_sws_opts);
00064     av_freep(&(*graph)->filters);
00065     av_freep(graph);
00066 }
00067 
00068 int avfilter_graph_add_filter(AVFilterGraph *graph, AVFilterContext *filter)
00069 {
00070     AVFilterContext **filters = av_realloc(graph->filters,
00071                                            sizeof(AVFilterContext*) * (graph->filter_count+1));
00072     if (!filters)
00073         return AVERROR(ENOMEM);
00074 
00075     graph->filters = filters;
00076     graph->filters[graph->filter_count++] = filter;
00077 
00078     return 0;
00079 }
00080 
00081 int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,
00082                                  const char *name, const char *args, void *opaque,
00083                                  AVFilterGraph *graph_ctx)
00084 {
00085     int ret;
00086 
00087     if ((ret = avfilter_open(filt_ctx, filt, name)) < 0)
00088         goto fail;
00089     if ((ret = avfilter_init_filter(*filt_ctx, args, opaque)) < 0)
00090         goto fail;
00091     if ((ret = avfilter_graph_add_filter(graph_ctx, *filt_ctx)) < 0)
00092         goto fail;
00093     return 0;
00094 
00095 fail:
00096     if (*filt_ctx)
00097         avfilter_free(*filt_ctx);
00098     *filt_ctx = NULL;
00099     return ret;
00100 }
00101 
00102 void avfilter_graph_set_auto_convert(AVFilterGraph *graph, unsigned flags)
00103 {
00104     graph->disable_auto_convert = flags;
00105 }
00106 
00115 static int graph_check_validity(AVFilterGraph *graph, AVClass *log_ctx)
00116 {
00117     AVFilterContext *filt;
00118     int i, j;
00119 
00120     for (i = 0; i < graph->filter_count; i++) {
00121         filt = graph->filters[i];
00122 
00123         for (j = 0; j < filt->nb_inputs; j++) {
00124             if (!filt->inputs[j] || !filt->inputs[j]->src) {
00125                 av_log(log_ctx, AV_LOG_ERROR,
00126                        "Input pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any source\n",
00127                        filt->input_pads[j].name, filt->name, filt->filter->name);
00128                 return AVERROR(EINVAL);
00129             }
00130         }
00131 
00132         for (j = 0; j < filt->nb_outputs; j++) {
00133             if (!filt->outputs[j] || !filt->outputs[j]->dst) {
00134                 av_log(log_ctx, AV_LOG_ERROR,
00135                        "Output pad \"%s\" for the filter \"%s\" of type \"%s\" not connected to any destination\n",
00136                        filt->output_pads[j].name, filt->name, filt->filter->name);
00137                 return AVERROR(EINVAL);
00138             }
00139         }
00140     }
00141 
00142     return 0;
00143 }
00144 
00150 static int graph_config_links(AVFilterGraph *graph, AVClass *log_ctx)
00151 {
00152     AVFilterContext *filt;
00153     int i, ret;
00154 
00155     for (i=0; i < graph->filter_count; i++) {
00156         filt = graph->filters[i];
00157 
00158         if (!filt->nb_outputs) {
00159             if ((ret = avfilter_config_links(filt)))
00160                 return ret;
00161         }
00162     }
00163 
00164     return 0;
00165 }
00166 
00167 AVFilterContext *avfilter_graph_get_filter(AVFilterGraph *graph, char *name)
00168 {
00169     int i;
00170 
00171     for (i = 0; i < graph->filter_count; i++)
00172         if (graph->filters[i]->name && !strcmp(name, graph->filters[i]->name))
00173             return graph->filters[i];
00174 
00175     return NULL;
00176 }
00177 
00178 static int filter_query_formats(AVFilterContext *ctx)
00179 {
00180     int ret;
00181     AVFilterFormats *formats;
00182     AVFilterChannelLayouts *chlayouts;
00183     AVFilterFormats *samplerates;
00184     enum AVMediaType type = ctx->inputs  && ctx->inputs [0] ? ctx->inputs [0]->type :
00185                             ctx->outputs && ctx->outputs[0] ? ctx->outputs[0]->type :
00186                             AVMEDIA_TYPE_VIDEO;
00187 
00188     if ((ret = ctx->filter->query_formats(ctx)) < 0)
00189         return ret;
00190 
00191     formats = ff_all_formats(type);
00192     if (!formats)
00193         return AVERROR(ENOMEM);
00194     ff_set_common_formats(ctx, formats);
00195     if (type == AVMEDIA_TYPE_AUDIO) {
00196         samplerates = ff_all_samplerates();
00197         if (!samplerates)
00198             return AVERROR(ENOMEM);
00199         ff_set_common_samplerates(ctx, samplerates);
00200         chlayouts = ff_all_channel_layouts();
00201         if (!chlayouts)
00202             return AVERROR(ENOMEM);
00203         ff_set_common_channel_layouts(ctx, chlayouts);
00204     }
00205     return 0;
00206 }
00207 
00208 static int insert_conv_filter(AVFilterGraph *graph, AVFilterLink *link,
00209                               const char *filt_name, const char *filt_args)
00210 {
00211     static int auto_count = 0, ret;
00212     char inst_name[32];
00213     AVFilterContext *filt_ctx;
00214 
00215     if (graph->disable_auto_convert) {
00216         av_log(NULL, AV_LOG_ERROR,
00217                "The filters '%s' and '%s' do not have a common format "
00218                "and automatic conversion is disabled.\n",
00219                link->src->name, link->dst->name);
00220         return AVERROR(EINVAL);
00221     }
00222 
00223     snprintf(inst_name, sizeof(inst_name), "auto-inserted %s %d",
00224             filt_name, auto_count++);
00225 
00226     if ((ret = avfilter_graph_create_filter(&filt_ctx,
00227                                             avfilter_get_by_name(filt_name),
00228                                             inst_name, filt_args, NULL, graph)) < 0)
00229         return ret;
00230     if ((ret = avfilter_insert_filter(link, filt_ctx, 0, 0)) < 0)
00231         return ret;
00232 
00233     filter_query_formats(filt_ctx);
00234 
00235     if ( ((link = filt_ctx-> inputs[0]) &&
00236            !ff_merge_formats(link->in_formats, link->out_formats)) ||
00237          ((link = filt_ctx->outputs[0]) &&
00238            !ff_merge_formats(link->in_formats, link->out_formats))
00239        ) {
00240         av_log(NULL, AV_LOG_ERROR,
00241                "Impossible to convert between the formats supported by the filter "
00242                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
00243         return AVERROR(EINVAL);
00244     }
00245 
00246     if (link->type == AVMEDIA_TYPE_AUDIO &&
00247          (((link = filt_ctx-> inputs[0]) &&
00248            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)) ||
00249          ((link = filt_ctx->outputs[0]) &&
00250            !ff_merge_channel_layouts(link->in_channel_layouts, link->out_channel_layouts)))
00251        ) {
00252         av_log(NULL, AV_LOG_ERROR,
00253                "Impossible to convert between the channel layouts formats supported by the filter "
00254                "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
00255         return AVERROR(EINVAL);
00256     }
00257 
00258     return 0;
00259 }
00260 
00261 static int query_formats(AVFilterGraph *graph, AVClass *log_ctx)
00262 {
00263     int i, j, ret;
00264     char filt_args[128];
00265     AVFilterFormats *formats;
00266     AVFilterChannelLayouts *chlayouts;
00267     AVFilterFormats *samplerates;
00268     int scaler_count = 0, resampler_count = 0;
00269 
00270     for (j = 0; j < 2; j++) {
00271     /* ask all the sub-filters for their supported media formats */
00272     for (i = 0; i < graph->filter_count; i++) {
00273         /* Call query_formats on sources first.
00274            This is a temporary workaround for amerge,
00275            until format renegociation is implemented. */
00276         if (!graph->filters[i]->nb_inputs == j)
00277             continue;
00278         if (graph->filters[i]->filter->query_formats)
00279             ret = filter_query_formats(graph->filters[i]);
00280         else
00281             ret = ff_default_query_formats(graph->filters[i]);
00282         if (ret < 0)
00283             return ret;
00284     }
00285     }
00286 
00287     /* go through and merge as many format lists as possible */
00288     for (i = 0; i < graph->filter_count; i++) {
00289         AVFilterContext *filter = graph->filters[i];
00290 
00291         for (j = 0; j < filter->nb_inputs; j++) {
00292             AVFilterLink *link = filter->inputs[j];
00293 #if 0
00294             if (!link) continue;
00295 
00296             if (!link->in_formats || !link->out_formats)
00297                 return AVERROR(EINVAL);
00298 
00299             if (link->type == AVMEDIA_TYPE_VIDEO &&
00300                 !ff_merge_formats(link->in_formats, link->out_formats)) {
00301 
00302                 /* couldn't merge format lists, auto-insert scale filter */
00303                 snprintf(filt_args, sizeof(filt_args), "0:0:%s",
00304                          graph->scale_sws_opts);
00305                 if (ret = insert_conv_filter(graph, link, "scale", filt_args))
00306                     return ret;
00307             }
00308             else if (link->type == AVMEDIA_TYPE_AUDIO) {
00309                 if (!link->in_channel_layouts || !link->out_channel_layouts)
00310                     return AVERROR(EINVAL);
00311 
00312                 /* Merge all three list before checking: that way, in all
00313                  * three categories, aconvert will use a common format
00314                  * whenever possible. */
00315                 formats     = ff_merge_formats(link->in_formats,   link->out_formats);
00316                 chlayouts   = ff_merge_channel_layouts(link->in_channel_layouts  , link->out_channel_layouts);
00317                 samplerates = ff_merge_samplerates    (link->in_samplerates, link->out_samplerates);
00318 
00319                 if (!formats || !chlayouts || !samplerates)
00320                     if (ret = insert_conv_filter(graph, link, "aresample", NULL))
00321                        return ret;
00322 #else
00323             int convert_needed = 0;
00324 
00325             if (!link)
00326                 continue;
00327 
00328             if (link->in_formats != link->out_formats &&
00329                 !ff_merge_formats(link->in_formats,
00330                                         link->out_formats))
00331                 convert_needed = 1;
00332             if (link->type == AVMEDIA_TYPE_AUDIO) {
00333                 if (link->in_channel_layouts != link->out_channel_layouts &&
00334                     !ff_merge_channel_layouts(link->in_channel_layouts,
00335                                               link->out_channel_layouts))
00336                     convert_needed = 1;
00337                 if (link->in_samplerates != link->out_samplerates &&
00338                     !ff_merge_samplerates(link->in_samplerates,
00339                                           link->out_samplerates))
00340                     convert_needed = 1;
00341             }
00342 
00343             if (convert_needed) {
00344                 AVFilterContext *convert;
00345                 AVFilter *filter;
00346                 AVFilterLink *inlink, *outlink;
00347                 char scale_args[256];
00348                 char inst_name[30];
00349 
00350                 /* couldn't merge format lists. auto-insert conversion filter */
00351                 switch (link->type) {
00352                 case AVMEDIA_TYPE_VIDEO:
00353                     if (!(filter = avfilter_get_by_name("scale"))) {
00354                         av_log(log_ctx, AV_LOG_ERROR, "'scale' filter "
00355                                "not present, cannot convert pixel formats.\n");
00356                         return AVERROR(EINVAL);
00357                     }
00358 
00359                     snprintf(inst_name, sizeof(inst_name), "auto-inserted scaler %d",
00360                              scaler_count++);
00361                     snprintf(scale_args, sizeof(scale_args), "0:0:%s", graph->scale_sws_opts);
00362                     if ((ret = avfilter_graph_create_filter(&convert, filter,
00363                                                             inst_name, scale_args, NULL,
00364                                                             graph)) < 0)
00365                         return ret;
00366                     break;
00367                 case AVMEDIA_TYPE_AUDIO:
00368                     if (!(filter = avfilter_get_by_name("aresample"))) {
00369                         av_log(log_ctx, AV_LOG_ERROR, "'aresample' filter "
00370                                "not present, cannot convert audio formats.\n");
00371                         return AVERROR(EINVAL);
00372                     }
00373 
00374                     snprintf(inst_name, sizeof(inst_name), "auto-inserted resampler %d",
00375                              resampler_count++);
00376                     if ((ret = avfilter_graph_create_filter(&convert, filter,
00377                                                             inst_name, NULL, NULL, graph)) < 0)
00378                         return ret;
00379                     break;
00380                 default:
00381                     return AVERROR(EINVAL);
00382                 }
00383 
00384                 if ((ret = avfilter_insert_filter(link, convert, 0, 0)) < 0)
00385                     return ret;
00386 
00387                 filter_query_formats(convert);
00388                 inlink  = convert->inputs[0];
00389                 outlink = convert->outputs[0];
00390                 if (!ff_merge_formats( inlink->in_formats,  inlink->out_formats) ||
00391                     !ff_merge_formats(outlink->in_formats, outlink->out_formats))
00392                     ret |= AVERROR(ENOSYS);
00393                 if (inlink->type == AVMEDIA_TYPE_AUDIO &&
00394                     (!ff_merge_samplerates(inlink->in_samplerates,
00395                                            inlink->out_samplerates) ||
00396                      !ff_merge_channel_layouts(inlink->in_channel_layouts,
00397                                                inlink->out_channel_layouts)))
00398                     ret |= AVERROR(ENOSYS);
00399                 if (outlink->type == AVMEDIA_TYPE_AUDIO &&
00400                     (!ff_merge_samplerates(outlink->in_samplerates,
00401                                            outlink->out_samplerates) ||
00402                      !ff_merge_channel_layouts(outlink->in_channel_layouts,
00403                                                outlink->out_channel_layouts)))
00404                     ret |= AVERROR(ENOSYS);
00405 
00406                 if (ret < 0) {
00407                     av_log(log_ctx, AV_LOG_ERROR,
00408                            "Impossible to convert between the formats supported by the filter "
00409                            "'%s' and the filter '%s'\n", link->src->name, link->dst->name);
00410                     return ret;
00411                 }
00412 #endif
00413             }
00414         }
00415     }
00416 
00417     return 0;
00418 }
00419 
00420 static int pick_format(AVFilterLink *link, AVFilterLink *ref)
00421 {
00422     if (!link || !link->in_formats)
00423         return 0;
00424 
00425     if (link->type == AVMEDIA_TYPE_VIDEO) {
00426         if(ref && ref->type == AVMEDIA_TYPE_VIDEO){
00427             int has_alpha= av_pix_fmt_descriptors[ref->format].nb_components % 2 == 0;
00428             enum PixelFormat best= PIX_FMT_NONE;
00429             int i;
00430             for (i=0; i<link->in_formats->format_count; i++) {
00431                 enum PixelFormat p = link->in_formats->formats[i];
00432                 best= avcodec_find_best_pix_fmt_of_2(best, p, ref->format, has_alpha, NULL);
00433             }
00434             av_log(link->src,AV_LOG_DEBUG, "picking %s out of %d ref:%s alpha:%d\n",
00435                    av_get_pix_fmt_name(best), link->in_formats->format_count,
00436                    av_get_pix_fmt_name(ref->format), has_alpha);
00437             link->in_formats->formats[0] = best;
00438         }
00439     }
00440 
00441     link->in_formats->format_count = 1;
00442     link->format = link->in_formats->formats[0];
00443 
00444     if (link->type == AVMEDIA_TYPE_AUDIO) {
00445         if (!link->in_samplerates->format_count) {
00446             av_log(link->src, AV_LOG_ERROR, "Cannot select sample rate for"
00447                    " the link between filters %s and %s.\n", link->src->name,
00448                    link->dst->name);
00449             return AVERROR(EINVAL);
00450         }
00451         link->in_samplerates->format_count = 1;
00452         link->sample_rate = link->in_samplerates->formats[0];
00453 
00454         if (!link->in_channel_layouts->nb_channel_layouts) {
00455             av_log(link->src, AV_LOG_ERROR, "Cannot select channel layout for"
00456                    "the link between filters %s and %s.\n", link->src->name,
00457                    link->dst->name);
00458             return AVERROR(EINVAL);
00459         }
00460         link->in_channel_layouts->nb_channel_layouts = 1;
00461         link->channel_layout = link->in_channel_layouts->channel_layouts[0];
00462     }
00463 
00464     ff_formats_unref(&link->in_formats);
00465     ff_formats_unref(&link->out_formats);
00466     ff_formats_unref(&link->in_samplerates);
00467     ff_formats_unref(&link->out_samplerates);
00468     ff_channel_layouts_unref(&link->in_channel_layouts);
00469     ff_channel_layouts_unref(&link->out_channel_layouts);
00470 
00471     return 0;
00472 }
00473 
00474 #define REDUCE_FORMATS(fmt_type, list_type, list, var, nb, add_format) \
00475 do {                                                                   \
00476     for (i = 0; i < filter->nb_inputs; i++) {                          \
00477         AVFilterLink *link = filter->inputs[i];                        \
00478         fmt_type fmt;                                                  \
00479                                                                        \
00480         if (!link->out_ ## list || link->out_ ## list->nb != 1)        \
00481             continue;                                                  \
00482         fmt = link->out_ ## list->var[0];                              \
00483                                                                        \
00484         for (j = 0; j < filter->nb_outputs; j++) {                     \
00485             AVFilterLink *out_link = filter->outputs[j];               \
00486             list_type *fmts;                                           \
00487                                                                        \
00488             if (link->type != out_link->type ||                        \
00489                 out_link->in_ ## list->nb == 1)                        \
00490                 continue;                                              \
00491             fmts = out_link->in_ ## list;                              \
00492                                                                        \
00493             if (!out_link->in_ ## list->nb) {                          \
00494                 add_format(&out_link->in_ ##list, fmt);                \
00495                 break;                                                 \
00496             }                                                          \
00497                                                                        \
00498             for (k = 0; k < out_link->in_ ## list->nb; k++)            \
00499                 if (fmts->var[k] == fmt) {                             \
00500                     fmts->var[0]  = fmt;                               \
00501                     fmts->nb = 1;                                      \
00502                     ret = 1;                                           \
00503                     break;                                             \
00504                 }                                                      \
00505         }                                                              \
00506     }                                                                  \
00507 } while (0)
00508 
00509 static int reduce_formats_on_filter(AVFilterContext *filter)
00510 {
00511     int i, j, k, ret = 0;
00512 
00513     REDUCE_FORMATS(int,      AVFilterFormats,        formats,         formats,
00514                    format_count, ff_add_format);
00515     REDUCE_FORMATS(int,      AVFilterFormats,        samplerates,     formats,
00516                    format_count, ff_add_format);
00517     REDUCE_FORMATS(uint64_t, AVFilterChannelLayouts, channel_layouts,
00518                    channel_layouts, nb_channel_layouts, ff_add_channel_layout);
00519 
00520     return ret;
00521 }
00522 
00523 static void reduce_formats(AVFilterGraph *graph)
00524 {
00525     int i, reduced;
00526 
00527     do {
00528         reduced = 0;
00529 
00530         for (i = 0; i < graph->filter_count; i++)
00531             reduced |= reduce_formats_on_filter(graph->filters[i]);
00532     } while (reduced);
00533 }
00534 
00535 static void swap_samplerates_on_filter(AVFilterContext *filter)
00536 {
00537     AVFilterLink *link = NULL;
00538     int sample_rate;
00539     int i, j;
00540 
00541     for (i = 0; i < filter->nb_inputs; i++) {
00542         link = filter->inputs[i];
00543 
00544         if (link->type == AVMEDIA_TYPE_AUDIO &&
00545             link->out_samplerates->format_count == 1)
00546             break;
00547     }
00548     if (i == filter->nb_inputs)
00549         return;
00550 
00551     sample_rate = link->out_samplerates->formats[0];
00552 
00553     for (i = 0; i < filter->nb_outputs; i++) {
00554         AVFilterLink *outlink = filter->outputs[i];
00555         int best_idx, best_diff = INT_MAX;
00556 
00557         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
00558             outlink->in_samplerates->format_count < 2)
00559             continue;
00560 
00561         for (j = 0; j < outlink->in_samplerates->format_count; j++) {
00562             int diff = abs(sample_rate - outlink->in_samplerates->formats[j]);
00563 
00564             if (diff < best_diff) {
00565                 best_diff = diff;
00566                 best_idx  = j;
00567             }
00568         }
00569         FFSWAP(int, outlink->in_samplerates->formats[0],
00570                outlink->in_samplerates->formats[best_idx]);
00571     }
00572 }
00573 
00574 static void swap_samplerates(AVFilterGraph *graph)
00575 {
00576     int i;
00577 
00578     for (i = 0; i < graph->filter_count; i++)
00579         swap_samplerates_on_filter(graph->filters[i]);
00580 }
00581 
00582 #define CH_CENTER_PAIR (AV_CH_FRONT_LEFT_OF_CENTER | AV_CH_FRONT_RIGHT_OF_CENTER)
00583 #define CH_FRONT_PAIR  (AV_CH_FRONT_LEFT           | AV_CH_FRONT_RIGHT)
00584 #define CH_STEREO_PAIR (AV_CH_STEREO_LEFT          | AV_CH_STEREO_RIGHT)
00585 #define CH_WIDE_PAIR   (AV_CH_WIDE_LEFT            | AV_CH_WIDE_RIGHT)
00586 #define CH_SIDE_PAIR   (AV_CH_SIDE_LEFT            | AV_CH_SIDE_RIGHT)
00587 #define CH_DIRECT_PAIR (AV_CH_SURROUND_DIRECT_LEFT | AV_CH_SURROUND_DIRECT_RIGHT)
00588 #define CH_BACK_PAIR   (AV_CH_BACK_LEFT            | AV_CH_BACK_RIGHT)
00589 
00590 /* allowable substitutions for channel pairs when comparing layouts,
00591  * ordered by priority for both values */
00592 static const uint64_t ch_subst[][2] = {
00593     { CH_FRONT_PAIR,      CH_CENTER_PAIR     },
00594     { CH_FRONT_PAIR,      CH_WIDE_PAIR       },
00595     { CH_FRONT_PAIR,      AV_CH_FRONT_CENTER },
00596     { CH_CENTER_PAIR,     CH_FRONT_PAIR      },
00597     { CH_CENTER_PAIR,     CH_WIDE_PAIR       },
00598     { CH_CENTER_PAIR,     AV_CH_FRONT_CENTER },
00599     { CH_WIDE_PAIR,       CH_FRONT_PAIR      },
00600     { CH_WIDE_PAIR,       CH_CENTER_PAIR     },
00601     { CH_WIDE_PAIR,       AV_CH_FRONT_CENTER },
00602     { AV_CH_FRONT_CENTER, CH_FRONT_PAIR      },
00603     { AV_CH_FRONT_CENTER, CH_CENTER_PAIR     },
00604     { AV_CH_FRONT_CENTER, CH_WIDE_PAIR       },
00605     { CH_SIDE_PAIR,       CH_DIRECT_PAIR     },
00606     { CH_SIDE_PAIR,       CH_BACK_PAIR       },
00607     { CH_SIDE_PAIR,       AV_CH_BACK_CENTER  },
00608     { CH_BACK_PAIR,       CH_DIRECT_PAIR     },
00609     { CH_BACK_PAIR,       CH_SIDE_PAIR       },
00610     { CH_BACK_PAIR,       AV_CH_BACK_CENTER  },
00611     { AV_CH_BACK_CENTER,  CH_BACK_PAIR       },
00612     { AV_CH_BACK_CENTER,  CH_DIRECT_PAIR     },
00613     { AV_CH_BACK_CENTER,  CH_SIDE_PAIR       },
00614 };
00615 
00616 static void swap_channel_layouts_on_filter(AVFilterContext *filter)
00617 {
00618     AVFilterLink *link = NULL;
00619     int i, j, k;
00620 
00621     for (i = 0; i < filter->nb_inputs; i++) {
00622         link = filter->inputs[i];
00623 
00624         if (link->type == AVMEDIA_TYPE_AUDIO &&
00625             link->out_channel_layouts->nb_channel_layouts == 1)
00626             break;
00627     }
00628     if (i == filter->nb_inputs)
00629         return;
00630 
00631     for (i = 0; i < filter->nb_outputs; i++) {
00632         AVFilterLink *outlink = filter->outputs[i];
00633         int best_idx = -1, best_score = INT_MIN, best_count_diff = INT_MAX;
00634 
00635         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
00636             outlink->in_channel_layouts->nb_channel_layouts < 2)
00637             continue;
00638 
00639         for (j = 0; j < outlink->in_channel_layouts->nb_channel_layouts; j++) {
00640             uint64_t  in_chlayout = link->out_channel_layouts->channel_layouts[0];
00641             uint64_t out_chlayout = outlink->in_channel_layouts->channel_layouts[j];
00642             int  in_channels      = av_get_channel_layout_nb_channels(in_chlayout);
00643             int out_channels      = av_get_channel_layout_nb_channels(out_chlayout);
00644             int count_diff        = out_channels - in_channels;
00645             int matched_channels, extra_channels;
00646             int score = 0;
00647 
00648             /* channel substitution */
00649             for (k = 0; k < FF_ARRAY_ELEMS(ch_subst); k++) {
00650                 uint64_t cmp0 = ch_subst[k][0];
00651                 uint64_t cmp1 = ch_subst[k][1];
00652                 if (( in_chlayout & cmp0) && (!(out_chlayout & cmp0)) &&
00653                     (out_chlayout & cmp1) && (!( in_chlayout & cmp1))) {
00654                     in_chlayout  &= ~cmp0;
00655                     out_chlayout &= ~cmp1;
00656                     /* add score for channel match, minus a deduction for
00657                        having to do the substitution */
00658                     score += 10 * av_get_channel_layout_nb_channels(cmp1) - 2;
00659                 }
00660             }
00661 
00662             /* no penalty for LFE channel mismatch */
00663             if ( (in_chlayout & AV_CH_LOW_FREQUENCY) &&
00664                 (out_chlayout & AV_CH_LOW_FREQUENCY))
00665                 score += 10;
00666             in_chlayout  &= ~AV_CH_LOW_FREQUENCY;
00667             out_chlayout &= ~AV_CH_LOW_FREQUENCY;
00668 
00669             matched_channels = av_get_channel_layout_nb_channels(in_chlayout &
00670                                                                  out_chlayout);
00671             extra_channels   = av_get_channel_layout_nb_channels(out_chlayout &
00672                                                                  (~in_chlayout));
00673             score += 10 * matched_channels - 5 * extra_channels;
00674 
00675             if (score > best_score ||
00676                 (count_diff < best_count_diff && score == best_score)) {
00677                 best_score = score;
00678                 best_idx   = j;
00679                 best_count_diff = count_diff;
00680             }
00681         }
00682         av_assert0(best_idx >= 0);
00683         FFSWAP(uint64_t, outlink->in_channel_layouts->channel_layouts[0],
00684                outlink->in_channel_layouts->channel_layouts[best_idx]);
00685     }
00686 
00687 }
00688 
00689 static void swap_channel_layouts(AVFilterGraph *graph)
00690 {
00691     int i;
00692 
00693     for (i = 0; i < graph->filter_count; i++)
00694         swap_channel_layouts_on_filter(graph->filters[i]);
00695 }
00696 
00697 static void swap_sample_fmts_on_filter(AVFilterContext *filter)
00698 {
00699     AVFilterLink *link = NULL;
00700     int format, bps;
00701     int i, j;
00702 
00703     for (i = 0; i < filter->nb_inputs; i++) {
00704         link = filter->inputs[i];
00705 
00706         if (link->type == AVMEDIA_TYPE_AUDIO &&
00707             link->out_formats->format_count == 1)
00708             break;
00709     }
00710     if (i == filter->nb_inputs)
00711         return;
00712 
00713     format = link->out_formats->formats[0];
00714     bps    = av_get_bytes_per_sample(format);
00715 
00716     for (i = 0; i < filter->nb_outputs; i++) {
00717         AVFilterLink *outlink = filter->outputs[i];
00718         int best_idx = -1, best_score = INT_MIN;
00719 
00720         if (outlink->type != AVMEDIA_TYPE_AUDIO ||
00721             outlink->in_formats->format_count < 2)
00722             continue;
00723 
00724         for (j = 0; j < outlink->in_formats->format_count; j++) {
00725             int out_format = outlink->in_formats->formats[j];
00726             int out_bps    = av_get_bytes_per_sample(out_format);
00727             int score;
00728 
00729             if (av_get_packed_sample_fmt(out_format) == format ||
00730                 av_get_planar_sample_fmt(out_format) == format) {
00731                 best_idx   = j;
00732                 break;
00733             }
00734 
00735             /* for s32 and float prefer double to prevent loss of information */
00736             if (bps == 4 && out_bps == 8) {
00737                 best_idx = j;
00738                 break;
00739             }
00740 
00741             /* prefer closest higher or equal bps */
00742             score = -abs(out_bps - bps);
00743             if (out_bps >= bps)
00744                 score += INT_MAX/2;
00745 
00746             if (score > best_score) {
00747                 best_score = score;
00748                 best_idx   = j;
00749             }
00750         }
00751         av_assert0(best_idx >= 0);
00752         FFSWAP(int, outlink->in_formats->formats[0],
00753                outlink->in_formats->formats[best_idx]);
00754     }
00755 }
00756 
00757 static void swap_sample_fmts(AVFilterGraph *graph)
00758 {
00759     int i;
00760 
00761     for (i = 0; i < graph->filter_count; i++)
00762         swap_sample_fmts_on_filter(graph->filters[i]);
00763 
00764 }
00765 
00766 static int pick_formats(AVFilterGraph *graph)
00767 {
00768     int i, j, ret;
00769     int change;
00770 
00771     do{
00772         change = 0;
00773         for (i = 0; i < graph->filter_count; i++) {
00774             AVFilterContext *filter = graph->filters[i];
00775             if (filter->nb_inputs){
00776                 for (j = 0; j < filter->nb_inputs; j++){
00777                     if(filter->inputs[j]->in_formats && filter->inputs[j]->in_formats->format_count == 1) {
00778                         pick_format(filter->inputs[j], NULL);
00779                         change = 1;
00780                     }
00781                 }
00782             }
00783             if (filter->nb_outputs){
00784                 for (j = 0; j < filter->nb_outputs; j++){
00785                     if(filter->outputs[j]->in_formats && filter->outputs[j]->in_formats->format_count == 1) {
00786                         pick_format(filter->outputs[j], NULL);
00787                         change = 1;
00788                     }
00789                 }
00790             }
00791             if (filter->nb_inputs && filter->nb_outputs && filter->inputs[0]->format>=0) {
00792                 for (j = 0; j < filter->nb_outputs; j++) {
00793                     if(filter->outputs[j]->format<0) {
00794                         pick_format(filter->outputs[j], filter->inputs[0]);
00795                         change = 1;
00796                     }
00797                 }
00798             }
00799         }
00800     }while(change);
00801 
00802     for (i = 0; i < graph->filter_count; i++) {
00803         AVFilterContext *filter = graph->filters[i];
00804 
00805         for (j = 0; j < filter->nb_inputs; j++)
00806             if ((ret = pick_format(filter->inputs[j], NULL)) < 0)
00807                 return ret;
00808         for (j = 0; j < filter->nb_outputs; j++)
00809             if ((ret = pick_format(filter->outputs[j], NULL)) < 0)
00810                 return ret;
00811     }
00812     return 0;
00813 }
00814 
00818 static int graph_config_formats(AVFilterGraph *graph, AVClass *log_ctx)
00819 {
00820     int ret;
00821 
00822     /* find supported formats from sub-filters, and merge along links */
00823     if ((ret = query_formats(graph, log_ctx)) < 0)
00824         return ret;
00825 
00826     /* Once everything is merged, it's possible that we'll still have
00827      * multiple valid media format choices. We try to minimize the amount
00828      * of format conversion inside filters */
00829     reduce_formats(graph);
00830 
00831     /* for audio filters, ensure the best format, sample rate and channel layout
00832      * is selected */
00833     swap_sample_fmts(graph);
00834     swap_samplerates(graph);
00835     swap_channel_layouts(graph);
00836 
00837     if ((ret = pick_formats(graph)) < 0)
00838         return ret;
00839 
00840     return 0;
00841 }
00842 
00843 static int ff_avfilter_graph_config_pointers(AVFilterGraph *graph,
00844                                              AVClass *log_ctx)
00845 {
00846     unsigned i, j;
00847     int sink_links_count = 0, n = 0;
00848     AVFilterContext *f;
00849     AVFilterLink **sinks;
00850 
00851     for (i = 0; i < graph->filter_count; i++) {
00852         f = graph->filters[i];
00853         for (j = 0; j < f->nb_inputs; j++) {
00854             f->inputs[j]->graph     = graph;
00855             f->inputs[j]->age_index = -1;
00856         }
00857         for (j = 0; j < f->nb_outputs; j++) {
00858             f->outputs[j]->graph    = graph;
00859             f->outputs[j]->age_index= -1;
00860         }
00861         if (!f->nb_outputs) {
00862             if (f->nb_inputs > INT_MAX - sink_links_count)
00863                 return AVERROR(EINVAL);
00864             sink_links_count += f->nb_inputs;
00865         }
00866     }
00867     sinks = av_calloc(sink_links_count, sizeof(*sinks));
00868     if (!sinks)
00869         return AVERROR(ENOMEM);
00870     for (i = 0; i < graph->filter_count; i++) {
00871         f = graph->filters[i];
00872         if (!f->nb_outputs) {
00873             for (j = 0; j < f->nb_inputs; j++) {
00874                 sinks[n] = f->inputs[j];
00875                 f->inputs[j]->age_index = n++;
00876             }
00877         }
00878     }
00879     av_assert0(n == sink_links_count);
00880     graph->sink_links       = sinks;
00881     graph->sink_links_count = sink_links_count;
00882     return 0;
00883 }
00884 
00885 static int graph_insert_fifos(AVFilterGraph *graph, AVClass *log_ctx)
00886 {
00887     AVFilterContext *f;
00888     int i, j, ret;
00889     int fifo_count = 0;
00890 
00891     for (i = 0; i < graph->filter_count; i++) {
00892         f = graph->filters[i];
00893 
00894         for (j = 0; j < f->nb_inputs; j++) {
00895             AVFilterLink *link = f->inputs[j];
00896             AVFilterContext *fifo_ctx;
00897             AVFilter *fifo;
00898             char name[32];
00899 
00900             if (!link->dstpad->needs_fifo)
00901                 continue;
00902 
00903             fifo = f->inputs[j]->type == AVMEDIA_TYPE_VIDEO ?
00904                    avfilter_get_by_name("fifo") :
00905                    avfilter_get_by_name("afifo");
00906 
00907             snprintf(name, sizeof(name), "auto-inserted fifo %d", fifo_count++);
00908 
00909             ret = avfilter_graph_create_filter(&fifo_ctx, fifo, name, NULL,
00910                                                NULL, graph);
00911             if (ret < 0)
00912                 return ret;
00913 
00914             ret = avfilter_insert_filter(link, fifo_ctx, 0, 0);
00915             if (ret < 0)
00916                 return ret;
00917         }
00918     }
00919 
00920     return 0;
00921 }
00922 
00923 int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
00924 {
00925     int ret;
00926 
00927     if ((ret = graph_check_validity(graphctx, log_ctx)))
00928         return ret;
00929     if ((ret = graph_insert_fifos(graphctx, log_ctx)) < 0)
00930         return ret;
00931     if ((ret = graph_config_formats(graphctx, log_ctx)))
00932         return ret;
00933     if ((ret = graph_config_links(graphctx, log_ctx)))
00934         return ret;
00935     if ((ret = ff_avfilter_graph_config_pointers(graphctx, log_ctx)))
00936         return ret;
00937 
00938     return 0;
00939 }
00940 
00941 int avfilter_graph_send_command(AVFilterGraph *graph, const char *target, const char *cmd, const char *arg, char *res, int res_len, int flags)
00942 {
00943     int i, r = AVERROR(ENOSYS);
00944 
00945     if(!graph)
00946         return r;
00947 
00948     if((flags & AVFILTER_CMD_FLAG_ONE) && !(flags & AVFILTER_CMD_FLAG_FAST)) {
00949         r=avfilter_graph_send_command(graph, target, cmd, arg, res, res_len, flags | AVFILTER_CMD_FLAG_FAST);
00950         if(r != AVERROR(ENOSYS))
00951             return r;
00952     }
00953 
00954     if(res_len && res)
00955         res[0]= 0;
00956 
00957     for (i = 0; i < graph->filter_count; i++) {
00958         AVFilterContext *filter = graph->filters[i];
00959         if(!strcmp(target, "all") || (filter->name && !strcmp(target, filter->name)) || !strcmp(target, filter->filter->name)){
00960             r = avfilter_process_command(filter, cmd, arg, res, res_len, flags);
00961             if(r != AVERROR(ENOSYS)) {
00962                 if((flags & AVFILTER_CMD_FLAG_ONE) || r<0)
00963                     return r;
00964             }
00965         }
00966     }
00967 
00968     return r;
00969 }
00970 
00971 int avfilter_graph_queue_command(AVFilterGraph *graph, const char *target, const char *command, const char *arg, int flags, double ts)
00972 {
00973     int i;
00974 
00975     if(!graph)
00976         return 0;
00977 
00978     for (i = 0; i < graph->filter_count; i++) {
00979         AVFilterContext *filter = graph->filters[i];
00980         if(filter && (!strcmp(target, "all") || !strcmp(target, filter->name) || !strcmp(target, filter->filter->name))){
00981             AVFilterCommand **que = &filter->command_queue, *next;
00982             while(*que && (*que)->time <= ts)
00983                 que = &(*que)->next;
00984             next= *que;
00985             *que= av_mallocz(sizeof(AVFilterCommand));
00986             (*que)->command = av_strdup(command);
00987             (*que)->arg     = av_strdup(arg);
00988             (*que)->time    = ts;
00989             (*que)->flags   = flags;
00990             (*que)->next    = next;
00991             if(flags & AVFILTER_CMD_FLAG_ONE)
00992                 return 0;
00993         }
00994     }
00995 
00996     return 0;
00997 }
00998 
00999 static void heap_bubble_up(AVFilterGraph *graph,
01000                            AVFilterLink *link, int index)
01001 {
01002     AVFilterLink **links = graph->sink_links;
01003 
01004     while (index) {
01005         int parent = (index - 1) >> 1;
01006         if (links[parent]->current_pts >= link->current_pts)
01007             break;
01008         links[index] = links[parent];
01009         links[index]->age_index = index;
01010         index = parent;
01011     }
01012     links[index] = link;
01013     link->age_index = index;
01014 }
01015 
01016 static void heap_bubble_down(AVFilterGraph *graph,
01017                              AVFilterLink *link, int index)
01018 {
01019     AVFilterLink **links = graph->sink_links;
01020 
01021     while (1) {
01022         int child = 2 * index + 1;
01023         if (child >= graph->sink_links_count)
01024             break;
01025         if (child + 1 < graph->sink_links_count &&
01026             links[child + 1]->current_pts < links[child]->current_pts)
01027             child++;
01028         if (link->current_pts < links[child]->current_pts)
01029             break;
01030         links[index] = links[child];
01031         links[index]->age_index = index;
01032         index = child;
01033     }
01034     links[index] = link;
01035     link->age_index = index;
01036 }
01037 
01038 void ff_avfilter_graph_update_heap(AVFilterGraph *graph, AVFilterLink *link)
01039 {
01040     heap_bubble_up  (graph, link, link->age_index);
01041     heap_bubble_down(graph, link, link->age_index);
01042 }
01043 
01044 
01045 int avfilter_graph_request_oldest(AVFilterGraph *graph)
01046 {
01047     while (graph->sink_links_count) {
01048         AVFilterLink *oldest = graph->sink_links[0];
01049         int r = ff_request_frame(oldest);
01050         if (r != AVERROR_EOF)
01051             return r;
01052         av_log(oldest->dst, AV_LOG_DEBUG, "EOF on sink link %s:%s.\n",
01053                oldest->dst ? oldest->dst->name : "unknown",
01054                oldest->dstpad ? oldest->dstpad->name : "unknown");
01055         /* EOF: remove the link from the heap */
01056         if (oldest->age_index < --graph->sink_links_count)
01057             heap_bubble_down(graph, graph->sink_links[graph->sink_links_count],
01058                              oldest->age_index);
01059         oldest->age_index = -1;
01060     }
01061     return AVERROR_EOF;
01062 }