yading@10: /*
yading@10:  * filter layer
yading@10:  * Copyright (c) 2007 Bobby Bingham
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/avstring.h"
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/rational.h"
yading@10: #include "libavutil/samplefmt.h"
yading@10: 
yading@10: #include "audio.h"
yading@10: #include "avfilter.h"
yading@10: #include "formats.h"
yading@10: #include "internal.h"
yading@10: #include "audio.h"
yading@10: 
yading@10: static int ff_filter_frame_framed(AVFilterLink *link, AVFrame *frame);
yading@10: 
yading@10: void ff_tlog_ref(void *ctx, AVFrame *ref, int end)
yading@10: {
yading@10:     av_unused char buf[16];
yading@10:     ff_tlog(ctx,
yading@10:             "ref[%p buf:%p data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,
yading@10:             ref, ref->buf, ref->data[0],
yading@10:             ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],
yading@10:             ref->pts, av_frame_get_pkt_pos(ref));
yading@10: 
yading@10:     if (ref->width) {
yading@10:         ff_tlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",
yading@10:                 ref->sample_aspect_ratio.num, ref->sample_aspect_ratio.den,
yading@10:                 ref->width, ref->height,
yading@10:                 !ref->interlaced_frame     ? 'P' :         /* Progressive  */
yading@10:                 ref->top_field_first ? 'T' : 'B',    /* Top / Bottom */
yading@10:                 ref->key_frame,
yading@10:                 av_get_picture_type_char(ref->pict_type));
yading@10:     }
yading@10:     if (ref->nb_samples) {
yading@10:         ff_tlog(ctx, " cl:%"PRId64"d n:%d r:%d",
yading@10:                 ref->channel_layout,
yading@10:                 ref->nb_samples,
yading@10:                 ref->sample_rate);
yading@10:     }
yading@10: 
yading@10:     ff_tlog(ctx, "]%s", end ? "\n" : "");
yading@10: }
yading@10: 
yading@10: unsigned avfilter_version(void) {
yading@10:     av_assert0(LIBAVFILTER_VERSION_MICRO >= 100);
yading@10:     return LIBAVFILTER_VERSION_INT;
yading@10: }
yading@10: 
yading@10: const char *avfilter_configuration(void)
yading@10: {
yading@10:     return FFMPEG_CONFIGURATION;
yading@10: }
yading@10: 
yading@10: const char *avfilter_license(void)
yading@10: {
yading@10: #define LICENSE_PREFIX "libavfilter license: "
yading@10:     return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
yading@10: }
yading@10: 
yading@10: void ff_command_queue_pop(AVFilterContext *filter)
yading@10: {
yading@10:     AVFilterCommand *c= filter->command_queue;
yading@10:     av_freep(&c->arg);
yading@10:     av_freep(&c->command);
yading@10:     filter->command_queue= c->next;
yading@10:     av_free(c);
yading@10: }
yading@10: 
yading@10: void ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
yading@10:                    AVFilterPad **pads, AVFilterLink ***links,
yading@10:                    AVFilterPad *newpad)
yading@10: {
yading@10:     unsigned i;
yading@10: 
yading@10:     idx = FFMIN(idx, *count);
yading@10: 
yading@10:     *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
yading@10:     *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
yading@10:     memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
yading@10:     memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
yading@10:     memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
yading@10:     (*links)[idx] = NULL;
yading@10: 
yading@10:     (*count)++;
yading@10:     for (i = idx+1; i < *count; i++)
yading@10:         if (*links[i])
yading@10:             (*(unsigned *)((uint8_t *) *links[i] + padidx_off))++;
yading@10: }
yading@10: 
yading@10: int avfilter_link(AVFilterContext *src, unsigned srcpad,
yading@10:                   AVFilterContext *dst, unsigned dstpad)
yading@10: {
yading@10:     AVFilterLink *link;
yading@10: 
yading@10:     if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||
yading@10:         src->outputs[srcpad]      || dst->inputs[dstpad])
yading@10:         return -1;
yading@10: 
yading@10:     if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {
yading@10:         av_log(src, AV_LOG_ERROR,
yading@10:                "Media type mismatch between the '%s' filter output pad %d (%s) and the '%s' filter input pad %d (%s)\n",
yading@10:                src->name, srcpad, (char *)av_x_if_null(av_get_media_type_string(src->output_pads[srcpad].type), "?"),
yading@10:                dst->name, dstpad, (char *)av_x_if_null(av_get_media_type_string(dst-> input_pads[dstpad].type), "?"));
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     src->outputs[srcpad] =
yading@10:     dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
yading@10: 
yading@10:     link->src     = src;
yading@10:     link->dst     = dst;
yading@10:     link->srcpad  = &src->output_pads[srcpad];
yading@10:     link->dstpad  = &dst->input_pads[dstpad];
yading@10:     link->type    = src->output_pads[srcpad].type;
yading@10:     av_assert0(AV_PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);
yading@10:     link->format  = -1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void avfilter_link_free(AVFilterLink **link)
yading@10: {
yading@10:     if (!*link)
yading@10:         return;
yading@10: 
yading@10:     av_frame_free(&(*link)->partial_buf);
yading@10: 
yading@10:     av_freep(link);
yading@10: }
yading@10: 
yading@10: int avfilter_link_get_channels(AVFilterLink *link)
yading@10: {
yading@10:     return link->channels;
yading@10: }
yading@10: 
yading@10: void avfilter_link_set_closed(AVFilterLink *link, int closed)
yading@10: {
yading@10:     link->closed = closed;
yading@10: }
yading@10: 
yading@10: int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
yading@10:                            unsigned filt_srcpad_idx, unsigned filt_dstpad_idx)
yading@10: {
yading@10:     int ret;
yading@10:     unsigned dstpad_idx = link->dstpad - link->dst->input_pads;
yading@10: 
yading@10:     av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "
yading@10:            "between the filter '%s' and the filter '%s'\n",
yading@10:            filt->name, link->src->name, link->dst->name);
yading@10: 
yading@10:     link->dst->inputs[dstpad_idx] = NULL;
yading@10:     if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {
yading@10:         /* failed to link output filter to new filter */
yading@10:         link->dst->inputs[dstpad_idx] = link;
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     /* re-hookup the link to the new destination filter we inserted */
yading@10:     link->dst = filt;
yading@10:     link->dstpad = &filt->input_pads[filt_srcpad_idx];
yading@10:     filt->inputs[filt_srcpad_idx] = link;
yading@10: 
yading@10:     /* if any information on supported media formats already exists on the
yading@10:      * link, we need to preserve that */
yading@10:     if (link->out_formats)
yading@10:         ff_formats_changeref(&link->out_formats,
yading@10:                                    &filt->outputs[filt_dstpad_idx]->out_formats);
yading@10: 
yading@10:     if (link->out_samplerates)
yading@10:         ff_formats_changeref(&link->out_samplerates,
yading@10:                                    &filt->outputs[filt_dstpad_idx]->out_samplerates);
yading@10:     if (link->out_channel_layouts)
yading@10:         ff_channel_layouts_changeref(&link->out_channel_layouts,
yading@10:                                      &filt->outputs[filt_dstpad_idx]->out_channel_layouts);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int avfilter_config_links(AVFilterContext *filter)
yading@10: {
yading@10:     int (*config_link)(AVFilterLink *);
yading@10:     unsigned i;
yading@10:     int ret;
yading@10: 
yading@10:     for (i = 0; i < filter->nb_inputs; i ++) {
yading@10:         AVFilterLink *link = filter->inputs[i];
yading@10:         AVFilterLink *inlink;
yading@10: 
yading@10:         if (!link) continue;
yading@10: 
yading@10:         inlink = link->src->nb_inputs ? link->src->inputs[0] : NULL;
yading@10:         link->current_pts = AV_NOPTS_VALUE;
yading@10: 
yading@10:         switch (link->init_state) {
yading@10:         case AVLINK_INIT:
yading@10:             continue;
yading@10:         case AVLINK_STARTINIT:
yading@10:             av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
yading@10:             return 0;
yading@10:         case AVLINK_UNINIT:
yading@10:             link->init_state = AVLINK_STARTINIT;
yading@10: 
yading@10:             if ((ret = avfilter_config_links(link->src)) < 0)
yading@10:                 return ret;
yading@10: 
yading@10:             if (!(config_link = link->srcpad->config_props)) {
yading@10:                 if (link->src->nb_inputs != 1) {
yading@10:                     av_log(link->src, AV_LOG_ERROR, "Source filters and filters "
yading@10:                                                     "with more than one input "
yading@10:                                                     "must set config_props() "
yading@10:                                                     "callbacks on all outputs\n");
yading@10:                     return AVERROR(EINVAL);
yading@10:                 }
yading@10:             } else if ((ret = config_link(link)) < 0) {
yading@10:                 av_log(link->src, AV_LOG_ERROR,
yading@10:                        "Failed to configure output pad on %s\n",
yading@10:                        link->src->name);
yading@10:                 return ret;
yading@10:             }
yading@10: 
yading@10:             switch (link->type) {
yading@10:             case AVMEDIA_TYPE_VIDEO:
yading@10:                 if (!link->time_base.num && !link->time_base.den)
yading@10:                     link->time_base = inlink ? inlink->time_base : AV_TIME_BASE_Q;
yading@10: 
yading@10:                 if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)
yading@10:                     link->sample_aspect_ratio = inlink ?
yading@10:                         inlink->sample_aspect_ratio : (AVRational){1,1};
yading@10: 
yading@10:                 if (inlink && !link->frame_rate.num && !link->frame_rate.den)
yading@10:                     link->frame_rate = inlink->frame_rate;
yading@10: 
yading@10:                 if (inlink) {
yading@10:                     if (!link->w)
yading@10:                         link->w = inlink->w;
yading@10:                     if (!link->h)
yading@10:                         link->h = inlink->h;
yading@10:                 } else if (!link->w || !link->h) {
yading@10:                     av_log(link->src, AV_LOG_ERROR,
yading@10:                            "Video source filters must set their output link's "
yading@10:                            "width and height\n");
yading@10:                     return AVERROR(EINVAL);
yading@10:                 }
yading@10:                 break;
yading@10: 
yading@10:             case AVMEDIA_TYPE_AUDIO:
yading@10:                 if (inlink) {
yading@10:                     if (!link->time_base.num && !link->time_base.den)
yading@10:                         link->time_base = inlink->time_base;
yading@10:                 }
yading@10: 
yading@10:                 if (!link->time_base.num && !link->time_base.den)
yading@10:                     link->time_base = (AVRational) {1, link->sample_rate};
yading@10:             }
yading@10: 
yading@10:             if ((config_link = link->dstpad->config_props))
yading@10:                 if ((ret = config_link(link)) < 0) {
yading@10:                     av_log(link->src, AV_LOG_ERROR,
yading@10:                            "Failed to configure input pad on %s\n",
yading@10:                            link->dst->name);
yading@10:                     return ret;
yading@10:                 }
yading@10: 
yading@10:             link->init_state = AVLINK_INIT;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: void ff_tlog_link(void *ctx, AVFilterLink *link, int end)
yading@10: {
yading@10:     if (link->type == AVMEDIA_TYPE_VIDEO) {
yading@10:         ff_tlog(ctx,
yading@10:                 "link[%p s:%dx%d fmt:%s %s->%s]%s",
yading@10:                 link, link->w, link->h,
yading@10:                 av_get_pix_fmt_name(link->format),
yading@10:                 link->src ? link->src->filter->name : "",
yading@10:                 link->dst ? link->dst->filter->name : "",
yading@10:                 end ? "\n" : "");
yading@10:     } else {
yading@10:         char buf[128];
yading@10:         av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);
yading@10: 
yading@10:         ff_tlog(ctx,
yading@10:                 "link[%p r:%d cl:%s fmt:%s %s->%s]%s",
yading@10:                 link, (int)link->sample_rate, buf,
yading@10:                 av_get_sample_fmt_name(link->format),
yading@10:                 link->src ? link->src->filter->name : "",
yading@10:                 link->dst ? link->dst->filter->name : "",
yading@10:                 end ? "\n" : "");
yading@10:     }
yading@10: }
yading@10: 
yading@10: int ff_request_frame(AVFilterLink *link)
yading@10: {
yading@10:     int ret = -1;
yading@10:     FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);
yading@10: 
yading@10:     if (link->closed)
yading@10:         return AVERROR_EOF;
yading@10:     av_assert0(!link->frame_requested);
yading@10:     link->frame_requested = 1;
yading@10:     while (link->frame_requested) {
yading@10:         if (link->srcpad->request_frame)
yading@10:             ret = link->srcpad->request_frame(link);
yading@10:         else if (link->src->inputs[0])
yading@10:             ret = ff_request_frame(link->src->inputs[0]);
yading@10:         if (ret == AVERROR_EOF && link->partial_buf) {
yading@10:             AVFrame *pbuf = link->partial_buf;
yading@10:             link->partial_buf = NULL;
yading@10:             ret = ff_filter_frame_framed(link, pbuf);
yading@10:         }
yading@10:         if (ret < 0) {
yading@10:             link->frame_requested = 0;
yading@10:             if (ret == AVERROR_EOF)
yading@10:                 link->closed = 1;
yading@10:         } else {
yading@10:             av_assert0(!link->frame_requested ||
yading@10:                        link->flags & FF_LINK_FLAG_REQUEST_LOOP);
yading@10:         }
yading@10:     }
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: int ff_poll_frame(AVFilterLink *link)
yading@10: {
yading@10:     int i, min = INT_MAX;
yading@10: 
yading@10:     if (link->srcpad->poll_frame)
yading@10:         return link->srcpad->poll_frame(link);
yading@10: 
yading@10:     for (i = 0; i < link->src->nb_inputs; i++) {
yading@10:         int val;
yading@10:         if (!link->src->inputs[i])
yading@10:             return -1;
yading@10:         val = ff_poll_frame(link->src->inputs[i]);
yading@10:         min = FFMIN(min, val);
yading@10:     }
yading@10: 
yading@10:     return min;
yading@10: }
yading@10: 
yading@10: void ff_update_link_current_pts(AVFilterLink *link, int64_t pts)
yading@10: {
yading@10:     if (pts == AV_NOPTS_VALUE)
yading@10:         return;
yading@10:     link->current_pts = av_rescale_q(pts, link->time_base, AV_TIME_BASE_Q);
yading@10:     /* TODO use duration */
yading@10:     if (link->graph && link->age_index >= 0)
yading@10:         ff_avfilter_graph_update_heap(link->graph, link);
yading@10: }
yading@10: 
yading@10: int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags)
yading@10: {
yading@10:     if(!strcmp(cmd, "ping")){
yading@10:         av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);
yading@10:         return 0;
yading@10:     }else if(filter->filter->process_command) {
yading@10:         return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);
yading@10:     }
yading@10:     return AVERROR(ENOSYS);
yading@10: }
yading@10: 
yading@10: static AVFilter *first_filter;
yading@10: 
yading@10: AVFilter *avfilter_get_by_name(const char *name)
yading@10: {
yading@10:     AVFilter *f = NULL;
yading@10: 
yading@10:     if (!name)
yading@10:         return NULL;
yading@10: 
yading@10:     while ((f = avfilter_next(f)))
yading@10:         if (!strcmp(f->name, name))
yading@10:             return f;
yading@10: 
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: int avfilter_register(AVFilter *filter)
yading@10: {
yading@10:     AVFilter **f = &first_filter;
yading@10:     int i;
yading@10: 
yading@10:     for(i=0; filter->inputs && filter->inputs[i].name; i++) {
yading@10:         const AVFilterPad *input = &filter->inputs[i];
yading@10:         av_assert0(     !input->filter_frame
yading@10:                     || (!input->start_frame && !input->end_frame));
yading@10:     }
yading@10: 
yading@10:     while (*f)
yading@10:         f = &(*f)->next;
yading@10:     *f = filter;
yading@10:     filter->next = NULL;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: const AVFilter *avfilter_next(const AVFilter *prev)
yading@10: {
yading@10:     return prev ? prev->next : first_filter;
yading@10: }
yading@10: 
yading@10: #if FF_API_OLD_FILTER_REGISTER
yading@10: AVFilter **av_filter_next(AVFilter **filter)
yading@10: {
yading@10:     return filter ? &(*filter)->next : &first_filter;
yading@10: }
yading@10: 
yading@10: void avfilter_uninit(void)
yading@10: {
yading@10: }
yading@10: #endif
yading@10: 
yading@10: int avfilter_pad_count(const AVFilterPad *pads)
yading@10: {
yading@10:     int count;
yading@10: 
yading@10:     if (!pads)
yading@10:         return 0;
yading@10: 
yading@10:     for(count = 0; pads->name; count ++) pads ++;
yading@10:     return count;
yading@10: }
yading@10: 
yading@10: static const char *default_filter_name(void *filter_ctx)
yading@10: {
yading@10:     AVFilterContext *ctx = filter_ctx;
yading@10:     return ctx->name ? ctx->name : ctx->filter->name;
yading@10: }
yading@10: 
yading@10: static void *filter_child_next(void *obj, void *prev)
yading@10: {
yading@10:     AVFilterContext *ctx = obj;
yading@10:     if (!prev && ctx->filter && ctx->filter->priv_class && ctx->priv)
yading@10:         return ctx->priv;
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: static const AVClass *filter_child_class_next(const AVClass *prev)
yading@10: {
yading@10:     AVFilter *f = NULL;
yading@10: 
yading@10:     /* find the filter that corresponds to prev */
yading@10:     while (prev && (f = avfilter_next(f)))
yading@10:         if (f->priv_class == prev)
yading@10:             break;
yading@10: 
yading@10:     /* could not find filter corresponding to prev */
yading@10:     if (prev && !f)
yading@10:         return NULL;
yading@10: 
yading@10:     /* find next filter with specific options */
yading@10:     while ((f = avfilter_next(f)))
yading@10:         if (f->priv_class)
yading@10:             return f->priv_class;
yading@10: 
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: static const AVClass avfilter_class = {
yading@10:     .class_name = "AVFilter",
yading@10:     .item_name  = default_filter_name,
yading@10:     .version    = LIBAVUTIL_VERSION_INT,
yading@10:     .category   = AV_CLASS_CATEGORY_FILTER,
yading@10:     .child_next = filter_child_next,
yading@10:     .child_class_next = filter_child_class_next,
yading@10: };
yading@10: 
yading@10: AVFilterContext *ff_filter_alloc(const AVFilter *filter, const char *inst_name)
yading@10: {
yading@10:     AVFilterContext *ret;
yading@10: 
yading@10:     if (!filter)
yading@10:         return NULL;
yading@10: 
yading@10:     ret = av_mallocz(sizeof(AVFilterContext));
yading@10:     if (!ret)
yading@10:         return NULL;
yading@10: 
yading@10:     ret->av_class = &avfilter_class;
yading@10:     ret->filter   = filter;
yading@10:     ret->name     = inst_name ? av_strdup(inst_name) : NULL;
yading@10:     if (filter->priv_size) {
yading@10:         ret->priv     = av_mallocz(filter->priv_size);
yading@10:         if (!ret->priv)
yading@10:             goto err;
yading@10:     }
yading@10: 
yading@10:     if (filter->priv_class) {
yading@10:         *(const AVClass**)ret->priv = filter->priv_class;
yading@10:         av_opt_set_defaults(ret->priv);
yading@10:     }
yading@10: 
yading@10:     ret->nb_inputs = avfilter_pad_count(filter->inputs);
yading@10:     if (ret->nb_inputs ) {
yading@10:         ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->nb_inputs);
yading@10:         if (!ret->input_pads)
yading@10:             goto err;
yading@10:         memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->nb_inputs);
yading@10:         ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->nb_inputs);
yading@10:         if (!ret->inputs)
yading@10:             goto err;
yading@10:     }
yading@10: 
yading@10:     ret->nb_outputs = avfilter_pad_count(filter->outputs);
yading@10:     if (ret->nb_outputs) {
yading@10:         ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->nb_outputs);
yading@10:         if (!ret->output_pads)
yading@10:             goto err;
yading@10:         memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->nb_outputs);
yading@10:         ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->nb_outputs);
yading@10:         if (!ret->outputs)
yading@10:             goto err;
yading@10:     }
yading@10: #if FF_API_FOO_COUNT
yading@10:     ret->output_count = ret->nb_outputs;
yading@10:     ret->input_count  = ret->nb_inputs;
yading@10: #endif
yading@10: 
yading@10:     return ret;
yading@10: 
yading@10: err:
yading@10:     av_freep(&ret->inputs);
yading@10:     av_freep(&ret->input_pads);
yading@10:     ret->nb_inputs = 0;
yading@10:     av_freep(&ret->outputs);
yading@10:     av_freep(&ret->output_pads);
yading@10:     ret->nb_outputs = 0;
yading@10:     av_freep(&ret->priv);
yading@10:     av_free(ret);
yading@10:     return NULL;
yading@10: }
yading@10: 
yading@10: #if FF_API_AVFILTER_OPEN
yading@10: int avfilter_open(AVFilterContext **filter_ctx, AVFilter *filter, const char *inst_name)
yading@10: {
yading@10:     *filter_ctx = ff_filter_alloc(filter, inst_name);
yading@10:     return *filter_ctx ? 0 : AVERROR(ENOMEM);
yading@10: }
yading@10: #endif
yading@10: 
yading@10: void avfilter_free(AVFilterContext *filter)
yading@10: {
yading@10:     int i;
yading@10:     AVFilterLink *link;
yading@10: 
yading@10:     if (!filter)
yading@10:         return;
yading@10: 
yading@10:     if (filter->graph)
yading@10:         ff_filter_graph_remove_filter(filter->graph, filter);
yading@10: 
yading@10:     if (filter->filter->uninit)
yading@10:         filter->filter->uninit(filter);
yading@10: 
yading@10:     for (i = 0; i < filter->nb_inputs; i++) {
yading@10:         if ((link = filter->inputs[i])) {
yading@10:             if (link->src)
yading@10:                 link->src->outputs[link->srcpad - link->src->output_pads] = NULL;
yading@10:             ff_formats_unref(&link->in_formats);
yading@10:             ff_formats_unref(&link->out_formats);
yading@10:             ff_formats_unref(&link->in_samplerates);
yading@10:             ff_formats_unref(&link->out_samplerates);
yading@10:             ff_channel_layouts_unref(&link->in_channel_layouts);
yading@10:             ff_channel_layouts_unref(&link->out_channel_layouts);
yading@10:         }
yading@10:         avfilter_link_free(&link);
yading@10:     }
yading@10:     for (i = 0; i < filter->nb_outputs; i++) {
yading@10:         if ((link = filter->outputs[i])) {
yading@10:             if (link->dst)
yading@10:                 link->dst->inputs[link->dstpad - link->dst->input_pads] = NULL;
yading@10:             ff_formats_unref(&link->in_formats);
yading@10:             ff_formats_unref(&link->out_formats);
yading@10:             ff_formats_unref(&link->in_samplerates);
yading@10:             ff_formats_unref(&link->out_samplerates);
yading@10:             ff_channel_layouts_unref(&link->in_channel_layouts);
yading@10:             ff_channel_layouts_unref(&link->out_channel_layouts);
yading@10:         }
yading@10:         avfilter_link_free(&link);
yading@10:     }
yading@10: 
yading@10:     if (filter->filter->priv_class)
yading@10:         av_opt_free(filter->priv);
yading@10: 
yading@10:     av_freep(&filter->name);
yading@10:     av_freep(&filter->input_pads);
yading@10:     av_freep(&filter->output_pads);
yading@10:     av_freep(&filter->inputs);
yading@10:     av_freep(&filter->outputs);
yading@10:     av_freep(&filter->priv);
yading@10:     while(filter->command_queue){
yading@10:         ff_command_queue_pop(filter);
yading@10:     }
yading@10:     av_free(filter);
yading@10: }
yading@10: 
yading@10: static int process_options(AVFilterContext *ctx, AVDictionary **options,
yading@10:                            const char *args)
yading@10: {
yading@10:     const AVOption *o = NULL;
yading@10:     int ret, count = 0;
yading@10:     char *av_uninit(parsed_key), *av_uninit(value);
yading@10:     const char *key;
yading@10:     int offset= -1;
yading@10: 
yading@10:     if (!args)
yading@10:         return 0;
yading@10: 
yading@10:     while (*args) {
yading@10:         const char *shorthand = NULL;
yading@10: 
yading@10:         o = av_opt_next(ctx->priv, o);
yading@10:         if (o) {
yading@10:             if (o->type == AV_OPT_TYPE_CONST || o->offset == offset)
yading@10:                 continue;
yading@10:             offset = o->offset;
yading@10:             shorthand = o->name;
yading@10:         }
yading@10: 
yading@10:         ret = av_opt_get_key_value(&args, "=", ":",
yading@10:                                    shorthand ? AV_OPT_FLAG_IMPLICIT_KEY : 0,
yading@10:                                    &parsed_key, &value);
yading@10:         if (ret < 0) {
yading@10:             if (ret == AVERROR(EINVAL))
yading@10:                 av_log(ctx, AV_LOG_ERROR, "No option name near '%s'\n", args);
yading@10:             else
yading@10:                 av_log(ctx, AV_LOG_ERROR, "Unable to parse '%s': %s\n", args,
yading@10:                        av_err2str(ret));
yading@10:             return ret;
yading@10:         }
yading@10:         if (*args)
yading@10:             args++;
yading@10:         if (parsed_key) {
yading@10:             key = parsed_key;
yading@10:             while ((o = av_opt_next(ctx->priv, o))); /* discard all remaining shorthand */
yading@10:         } else {
yading@10:             key = shorthand;
yading@10:         }
yading@10: 
yading@10:         av_log(ctx, AV_LOG_DEBUG, "Setting '%s' to value '%s'\n", key, value);
yading@10:         av_dict_set(options, key, value, 0);
yading@10:         if ((ret = av_opt_set(ctx->priv, key, value, 0)) < 0) {
yading@10:             if (!av_opt_find(ctx->priv, key, NULL, 0, AV_OPT_SEARCH_CHILDREN | AV_OPT_SEARCH_FAKE_OBJ)) {
yading@10:             if (ret == AVERROR_OPTION_NOT_FOUND)
yading@10:                 av_log(ctx, AV_LOG_ERROR, "Option '%s' not found\n", key);
yading@10:             av_free(value);
yading@10:             av_free(parsed_key);
yading@10:             return ret;
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         av_free(value);
yading@10:         av_free(parsed_key);
yading@10:         count++;
yading@10:     }
yading@10:     return count;
yading@10: }
yading@10: 
yading@10: #if FF_API_AVFILTER_INIT_FILTER
yading@10: int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
yading@10: {
yading@10:     return avfilter_init_str(filter, args);
yading@10: }
yading@10: #endif
yading@10: 
yading@10: int avfilter_init_dict(AVFilterContext *ctx, AVDictionary **options)
yading@10: {
yading@10:     int ret = 0;
yading@10: 
yading@10:     if (ctx->filter->priv_class) {
yading@10:         ret = av_opt_set_dict(ctx->priv, options);
yading@10:         if (ret < 0) {
yading@10:             av_log(ctx, AV_LOG_ERROR, "Error applying options to the filter.\n");
yading@10:             return ret;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (ctx->filter->init_opaque)
yading@10:         ret = ctx->filter->init_opaque(ctx, NULL);
yading@10:     else if (ctx->filter->init)
yading@10:         ret = ctx->filter->init(ctx);
yading@10:     else if (ctx->filter->init_dict)
yading@10:         ret = ctx->filter->init_dict(ctx, options);
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: int avfilter_init_str(AVFilterContext *filter, const char *args)
yading@10: {
yading@10:     AVDictionary *options = NULL;
yading@10:     AVDictionaryEntry *e;
yading@10:     int ret=0;
yading@10: 
yading@10:     if (args && *args) {
yading@10:         if (!filter->filter->priv_class) {
yading@10:             av_log(filter, AV_LOG_ERROR, "This filter does not take any "
yading@10:                    "options, but options were provided: %s.\n", args);
yading@10:             return AVERROR(EINVAL);
yading@10:         }
yading@10: 
yading@10: #if FF_API_OLD_FILTER_OPTS
yading@10:             if (   !strcmp(filter->filter->name, "format")     ||
yading@10:                    !strcmp(filter->filter->name, "noformat")   ||
yading@10:                    !strcmp(filter->filter->name, "frei0r")     ||
yading@10:                    !strcmp(filter->filter->name, "frei0r_src") ||
yading@10:                    !strcmp(filter->filter->name, "ocv")        ||
yading@10:                    !strcmp(filter->filter->name, "pan")        ||
yading@10:                    !strcmp(filter->filter->name, "pp")         ||
yading@10:                    !strcmp(filter->filter->name, "aevalsrc")) {
yading@10:             /* a hack for compatibility with the old syntax
yading@10:              * replace colons with |s */
yading@10:             char *copy = av_strdup(args);
yading@10:             char *p    = copy;
yading@10:             int nb_leading = 0; // number of leading colons to skip
yading@10:             int deprecated = 0;
yading@10: 
yading@10:             if (!copy) {
yading@10:                 ret = AVERROR(ENOMEM);
yading@10:                 goto fail;
yading@10:             }
yading@10: 
yading@10:             if (!strcmp(filter->filter->name, "frei0r") ||
yading@10:                 !strcmp(filter->filter->name, "ocv"))
yading@10:                 nb_leading = 1;
yading@10:             else if (!strcmp(filter->filter->name, "frei0r_src"))
yading@10:                 nb_leading = 3;
yading@10: 
yading@10:             while (nb_leading--) {
yading@10:                 p = strchr(p, ':');
yading@10:                 if (!p) {
yading@10:                     p = copy + strlen(copy);
yading@10:                     break;
yading@10:                 }
yading@10:                 p++;
yading@10:             }
yading@10: 
yading@10:             deprecated = strchr(p, ':') != NULL;
yading@10: 
yading@10:             if (!strcmp(filter->filter->name, "aevalsrc")) {
yading@10:                 deprecated = 0;
yading@10:                 while ((p = strchr(p, ':')) && p[1] != ':') {
yading@10:                     const char *epos = strchr(p + 1, '=');
yading@10:                     const char *spos = strchr(p + 1, ':');
yading@10:                     const int next_token_is_opt = epos && (!spos || epos < spos);
yading@10:                     if (next_token_is_opt) {
yading@10:                         p++;
yading@10:                         break;
yading@10:                     }
yading@10:                     /* next token does not contain a '=', assume a channel expression */
yading@10:                     deprecated = 1;
yading@10:                     *p++ = '|';
yading@10:                 }
yading@10:                 if (p && *p == ':') { // double sep '::' found
yading@10:                     deprecated = 1;
yading@10:                     memmove(p, p + 1, strlen(p));
yading@10:                 }
yading@10:             } else
yading@10:             while ((p = strchr(p, ':')))
yading@10:                 *p++ = '|';
yading@10: 
yading@10:             if (deprecated)
yading@10:                 av_log(filter, AV_LOG_WARNING, "This syntax is deprecated. Use "
yading@10:                        "'|' to separate the list items.\n");
yading@10: 
yading@10:             av_log(filter, AV_LOG_DEBUG, "compat: called with args=[%s]\n", copy);
yading@10:             ret = process_options(filter, &options, copy);
yading@10:             av_freep(&copy);
yading@10: 
yading@10:             if (ret < 0)
yading@10:                 goto fail;
yading@10: #endif
yading@10:         } else {
yading@10: #if CONFIG_MP_FILTER
yading@10:             if (!strcmp(filter->filter->name, "mp")) {
yading@10:                 char *escaped;
yading@10: 
yading@10:                 if (!strncmp(args, "filter=", 7))
yading@10:                     args += 7;
yading@10:                 ret = av_escape(&escaped, args, ":=", AV_ESCAPE_MODE_BACKSLASH, 0);
yading@10:                 if (ret < 0) {
yading@10:                     av_log(filter, AV_LOG_ERROR, "Unable to escape MPlayer filters arg '%s'\n", args);
yading@10:                     goto fail;
yading@10:                 }
yading@10:                 ret = process_options(filter, &options, escaped);
yading@10:                 av_free(escaped);
yading@10:             } else
yading@10: #endif
yading@10:             ret = process_options(filter, &options, args);
yading@10:             if (ret < 0)
yading@10:                 goto fail;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     ret = avfilter_init_dict(filter, &options);
yading@10:     if (ret < 0)
yading@10:         goto fail;
yading@10: 
yading@10:     if ((e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
yading@10:         av_log(filter, AV_LOG_ERROR, "No such option: %s.\n", e->key);
yading@10:         ret = AVERROR_OPTION_NOT_FOUND;
yading@10:         goto fail;
yading@10:     }
yading@10: 
yading@10: fail:
yading@10:     av_dict_free(&options);
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: const char *avfilter_pad_get_name(const AVFilterPad *pads, int pad_idx)
yading@10: {
yading@10:     return pads[pad_idx].name;
yading@10: }
yading@10: 
yading@10: enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
yading@10: {
yading@10:     return pads[pad_idx].type;
yading@10: }
yading@10: 
yading@10: static int default_filter_frame(AVFilterLink *link, AVFrame *frame)
yading@10: {
yading@10:     return ff_filter_frame(link->dst->outputs[0], frame);
yading@10: }
yading@10: 
yading@10: static int ff_filter_frame_framed(AVFilterLink *link, AVFrame *frame)
yading@10: {
yading@10:     int (*filter_frame)(AVFilterLink *, AVFrame *);
yading@10:     AVFilterPad *dst = link->dstpad;
yading@10:     AVFrame *out;
yading@10:     int ret;
yading@10:     AVFilterCommand *cmd= link->dst->command_queue;
yading@10:     int64_t pts;
yading@10: 
yading@10:     if (link->closed) {
yading@10:         av_frame_free(&frame);
yading@10:         return AVERROR_EOF;
yading@10:     }
yading@10: 
yading@10:     if (!(filter_frame = dst->filter_frame))
yading@10:         filter_frame = default_filter_frame;
yading@10: 
yading@10:     /* copy the frame if needed */
yading@10:     if (dst->needs_writable && !av_frame_is_writable(frame)) {
yading@10:         av_log(link->dst, AV_LOG_DEBUG, "Copying data in avfilter.\n");
yading@10: 
yading@10:         /* Maybe use ff_copy_buffer_ref instead? */
yading@10:         switch (link->type) {
yading@10:         case AVMEDIA_TYPE_VIDEO:
yading@10:             out = ff_get_video_buffer(link, link->w, link->h);
yading@10:             break;
yading@10:         case AVMEDIA_TYPE_AUDIO:
yading@10:             out = ff_get_audio_buffer(link, frame->nb_samples);
yading@10:             break;
yading@10:         default: return AVERROR(EINVAL);
yading@10:         }
yading@10:         if (!out) {
yading@10:             av_frame_free(&frame);
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:         av_frame_copy_props(out, frame);
yading@10: 
yading@10:         switch (link->type) {
yading@10:         case AVMEDIA_TYPE_VIDEO:
yading@10:             av_image_copy(out->data, out->linesize, (const uint8_t **)frame->data, frame->linesize,
yading@10:                           frame->format, frame->width, frame->height);
yading@10:             break;
yading@10:         case AVMEDIA_TYPE_AUDIO:
yading@10:             av_samples_copy(out->extended_data, frame->extended_data,
yading@10:                             0, 0, frame->nb_samples,
yading@10:                             av_get_channel_layout_nb_channels(frame->channel_layout),
yading@10:                             frame->format);
yading@10:             break;
yading@10:         default: return AVERROR(EINVAL);
yading@10:         }
yading@10: 
yading@10:         av_frame_free(&frame);
yading@10:     } else
yading@10:         out = frame;
yading@10: 
yading@10:     while(cmd && cmd->time <= out->pts * av_q2d(link->time_base)){
yading@10:         av_log(link->dst, AV_LOG_DEBUG,
yading@10:                "Processing command time:%f command:%s arg:%s\n",
yading@10:                cmd->time, cmd->command, cmd->arg);
yading@10:         avfilter_process_command(link->dst, cmd->command, cmd->arg, 0, 0, cmd->flags);
yading@10:         ff_command_queue_pop(link->dst);
yading@10:         cmd= link->dst->command_queue;
yading@10:     }
yading@10: 
yading@10:     pts = out->pts;
yading@10:     ret = filter_frame(link, out);
yading@10:     link->frame_requested = 0;
yading@10:     ff_update_link_current_pts(link, pts);
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static int ff_filter_frame_needs_framing(AVFilterLink *link, AVFrame *frame)
yading@10: {
yading@10:     int insamples = frame->nb_samples, inpos = 0, nb_samples;
yading@10:     AVFrame *pbuf = link->partial_buf;
yading@10:     int nb_channels = av_frame_get_channels(frame);
yading@10:     int ret = 0;
yading@10: 
yading@10:     link->flags |= FF_LINK_FLAG_REQUEST_LOOP;
yading@10:     /* Handle framing (min_samples, max_samples) */
yading@10:     while (insamples) {
yading@10:         if (!pbuf) {
yading@10:             AVRational samples_tb = { 1, link->sample_rate };
yading@10:             pbuf = ff_get_audio_buffer(link, link->partial_buf_size);
yading@10:             if (!pbuf) {
yading@10:                 av_log(link->dst, AV_LOG_WARNING,
yading@10:                        "Samples dropped due to memory allocation failure.\n");
yading@10:                 return 0;
yading@10:             }
yading@10:             av_frame_copy_props(pbuf, frame);
yading@10:             pbuf->pts = frame->pts +
yading@10:                         av_rescale_q(inpos, samples_tb, link->time_base);
yading@10:             pbuf->nb_samples = 0;
yading@10:         }
yading@10:         nb_samples = FFMIN(insamples,
yading@10:                            link->partial_buf_size - pbuf->nb_samples);
yading@10:         av_samples_copy(pbuf->extended_data, frame->extended_data,
yading@10:                         pbuf->nb_samples, inpos,
yading@10:                         nb_samples, nb_channels, link->format);
yading@10:         inpos                   += nb_samples;
yading@10:         insamples               -= nb_samples;
yading@10:         pbuf->nb_samples += nb_samples;
yading@10:         if (pbuf->nb_samples >= link->min_samples) {
yading@10:             ret = ff_filter_frame_framed(link, pbuf);
yading@10:             pbuf = NULL;
yading@10:         }
yading@10:     }
yading@10:     av_frame_free(&frame);
yading@10:     link->partial_buf = pbuf;
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: int ff_filter_frame(AVFilterLink *link, AVFrame *frame)
yading@10: {
yading@10:     FF_TPRINTF_START(NULL, filter_frame); ff_tlog_link(NULL, link, 1); ff_tlog(NULL, " "); ff_tlog_ref(NULL, frame, 1);
yading@10: 
yading@10:     /* Consistency checks */
yading@10:     if (link->type == AVMEDIA_TYPE_VIDEO) {
yading@10:         if (strcmp(link->dst->filter->name, "scale")) {
yading@10:             av_assert1(frame->format                 == link->format);
yading@10:             av_assert1(frame->width               == link->w);
yading@10:             av_assert1(frame->height               == link->h);
yading@10:         }
yading@10:     } else {
yading@10:         av_assert1(frame->format                == link->format);
yading@10:         av_assert1(av_frame_get_channels(frame) == link->channels);
yading@10:         av_assert1(frame->channel_layout        == link->channel_layout);
yading@10:         av_assert1(frame->sample_rate           == link->sample_rate);
yading@10:     }
yading@10: 
yading@10:     /* Go directly to actual filtering if possible */
yading@10:     if (link->type == AVMEDIA_TYPE_AUDIO &&
yading@10:         link->min_samples &&
yading@10:         (link->partial_buf ||
yading@10:          frame->nb_samples < link->min_samples ||
yading@10:          frame->nb_samples > link->max_samples)) {
yading@10:         return ff_filter_frame_needs_framing(link, frame);
yading@10:     } else {
yading@10:         return ff_filter_frame_framed(link, frame);
yading@10:     }
yading@10: }
yading@10: 
yading@10: const AVClass *avfilter_get_class(void)
yading@10: {
yading@10:     return &avfilter_class;
yading@10: }