/* * filter layer * Copyright (c) 2007 Bobby Bingham * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/atomic.h"#include "libavutil/avassert.h"#include "libavutil/avstring.h"#include "libavutil/channel_layout.h"#include "libavutil/common.h"#include "libavutil/eval.h"#include "libavutil/imgutils.h"#include "libavutil/internal.h"#include "libavutil/opt.h"#include "libavutil/pixdesc.h"#include "libavutil/rational.h"#include "libavutil/samplefmt.h" #include "audio.h"#include "avfilter.h"#include "formats.h"#include "internal.h" static int ff_filter_frame_framed(AVFilterLink *link, AVFrame *frame); void ff_tlog_ref(void *ctx, AVFrame *ref, int end){    av_unused char buf[16];    ff_tlog(ctx,            "ref[%p buf:%p data:%p linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64,            ref, ref->buf, ref->data[0],            ref->linesize[0], ref->linesize[1], ref->linesize[2], ref->linesize[3],            ref->pts, av_frame_get_pkt_pos(ref));     if (ref->width) {        ff_tlog(ctx, " a:%d/%d s:%dx%d i:%c iskey:%d type:%c",                ref->sample_aspect_ratio.num, ref->sample_aspect_ratio.den,                ref->width, ref->height,                !ref->interlaced_frame     ? 'P' :         /* Progressive  */                ref->top_field_first ? 'T' : 'B',    /* Top / Bottom */                ref->key_frame,                av_get_picture_type_char(ref->pict_type));    }    if (ref->nb_samples) {        ff_tlog(ctx, " cl:%"PRId64"d n:%d r:%d",                ref->channel_layout,                ref->nb_samples,                ref->sample_rate);    }     ff_tlog(ctx, "]%s", end ? "\n" : "");} unsigned avfilter_version(void){    av_assert0(LIBAVFILTER_VERSION_MICRO >= 100);    return LIBAVFILTER_VERSION_INT;} const char *avfilter_configuration(void){    return FFMPEG_CONFIGURATION;} const char *avfilter_license(void){#define LICENSE_PREFIX "libavfilter license: "    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;} void ff_command_queue_pop(AVFilterContext *filter){    AVFilterCommand *c= filter->command_queue;    av_freep(&c->arg);    av_freep(&c->command);    filter->command_queue= c->next;    av_free(c);} int ff_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,                   AVFilterPad **pads, AVFilterLink ***links,                   AVFilterPad *newpad){    AVFilterLink **newlinks;    AVFilterPad *newpads;    unsigned i;     idx = FFMIN(idx, *count);     newpads  = av_realloc_array(*pads,  *count + 1, sizeof(AVFilterPad));    newlinks = av_realloc_array(*links, *count + 1, sizeof(AVFilterLink*));    if (newpads)        *pads  = newpads;    if (newlinks)        *links = newlinks;    if (!newpads || !newlinks)        return AVERROR(ENOMEM);     memmove(*pads  + idx + 1, *pads  + idx, sizeof(AVFilterPad)   * (*count - idx));    memmove(*links + idx + 1, *links + idx, sizeof(AVFilterLink*) * (*count - idx));    memcpy(*pads + idx, newpad, sizeof(AVFilterPad));    (*links)[idx] = NULL;     (*count)++;    for (i = idx + 1; i < *count; i++)        if ((*links)[i])            (*(unsigned *)((uint8_t *) (*links)[i] + padidx_off))++;     return 0;} int avfilter_link(AVFilterContext *src, unsigned srcpad,                  AVFilterContext *dst, unsigned dstpad){    AVFilterLink *link;     if (src->nb_outputs <= srcpad || dst->nb_inputs <= dstpad ||        src->outputs[srcpad]      || dst->inputs[dstpad])        return -1;     if (src->output_pads[srcpad].type != dst->input_pads[dstpad].type) {        av_log(src, AV_LOG_ERROR,               "Media type mismatch between the '%s' filter output pad %d (%s) and the '%s' filter input pad %d (%s)\n",               src->name, srcpad, (char *)av_x_if_null(av_get_media_type_string(src->output_pads[srcpad].type), "?"),               dst->name, dstpad, (char *)av_x_if_null(av_get_media_type_string(dst-> input_pads[dstpad].type), "?"));        return AVERROR(EINVAL);    }     link = av_mallocz(sizeof(*link));    if (!link)        return AVERROR(ENOMEM);     src->outputs[srcpad] = dst->inputs[dstpad] = link;     link->src     = src;    link->dst     = dst;    link->srcpad  = &src->output_pads[srcpad];    link->dstpad  = &dst->input_pads[dstpad];    link->type    = src->output_pads[srcpad].type;    av_assert0(AV_PIX_FMT_NONE == -1 && AV_SAMPLE_FMT_NONE == -1);    link->format  = -1;     return 0;} void avfilter_link_free(AVFilterLink **link){    if (!*link)        return;     av_frame_free(&(*link)->partial_buf);     av_freep(link);} int avfilter_link_get_channels(AVFilterLink *link){    return link->channels;} void avfilter_link_set_closed(AVFilterLink *link, int closed){    link->closed = closed;} int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,                           unsigned filt_srcpad_idx, unsigned filt_dstpad_idx){    int ret;    unsigned dstpad_idx = link->dstpad - link->dst->input_pads;     av_log(link->dst, AV_LOG_VERBOSE, "auto-inserting filter '%s' "           "between the filter '%s' and the filter '%s'\n",           filt->name, link->src->name, link->dst->name);     link->dst->inputs[dstpad_idx] = NULL;    if ((ret = avfilter_link(filt, filt_dstpad_idx, link->dst, dstpad_idx)) < 0) {        /* failed to link output filter to new filter */        link->dst->inputs[dstpad_idx] = link;        return ret;    }     /* re-hookup the link to the new destination filter we inserted */    link->dst                     = filt;    link->dstpad                  = &filt->input_pads[filt_srcpad_idx];    filt->inputs[filt_srcpad_idx] = link;     /* if any information on supported media formats already exists on the     * link, we need to preserve that */    if (link->out_formats)        ff_formats_changeref(&link->out_formats,                             &filt->outputs[filt_dstpad_idx]->out_formats);    if (link->out_samplerates)        ff_formats_changeref(&link->out_samplerates,                             &filt->outputs[filt_dstpad_idx]->out_samplerates);    if (link->out_channel_layouts)        ff_channel_layouts_changeref(&link->out_channel_layouts,                                     &filt->outputs[filt_dstpad_idx]->out_channel_layouts);     return 0;} int avfilter_config_links(AVFilterContext *filter){    int (*config_link)(AVFilterLink *);    unsigned i;    int ret;     for (i = 0; i < filter->nb_inputs; i ++) {        AVFilterLink *link = filter->inputs[i];        AVFilterLink *inlink;         if (!link) continue;         inlink = link->src->nb_inputs ? link->src->inputs[0] : NULL;        link->current_pts = AV_NOPTS_VALUE;         switch (link->init_state) {        case AVLINK_INIT:            continue;        case AVLINK_STARTINIT:            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");            return 0;        case AVLINK_UNINIT:            link->init_state = AVLINK_STARTINIT;             if ((ret = avfilter_config_links(link->src)) < 0)                return ret;             if (!(config_link = link->srcpad->config_props)) {                if (link->src->nb_inputs != 1) {                    av_log(link->src, AV_LOG_ERROR, "Source filters and filters "                                                    "with more than one input "                                                    "must set config_props() "                                                    "callbacks on all outputs\n");                    return AVERROR(EINVAL);                }            } else if ((ret = config_link(link)) < 0) {                av_log(link->src, AV_LOG_ERROR,                       "Failed to configure output pad on %s\n",                       link->src->name);                return ret;            }             switch (link->type) {            case AVMEDIA_TYPE_VIDEO:                if (!link->time_base.num && !link->time_base.den)                    link->time_base = inlink ? inlink->time_base : AV_TIME_BASE_Q;                 if (!link->sample_aspect_ratio.num && !link->sample_aspect_ratio.den)                    link->sample_aspect_ratio = inlink ?                        inlink->sample_aspect_ratio : (AVRational){1,1};                 if (inlink && !link->frame_rate.num && !link->frame_rate.den)                    link->frame_rate = inlink->frame_rate;                 if (inlink) {                    if (!link->w)                        link->w = inlink->w;                    if (!link->h)                        link->h = inlink->h;                } else if (!link->w || !link->h) {                    av_log(link->src, AV_LOG_ERROR,                           "Video source filters must set their output link's "                           "width and height\n");                    return AVERROR(EINVAL);                }                break;             case AVMEDIA_TYPE_AUDIO:                if (inlink) {                    if (!link->time_base.num && !link->time_base.den)                        link->time_base = inlink->time_base;                }                 if (!link->time_base.num && !link->time_base.den)                    link->time_base = (AVRational) {1, link->sample_rate};            }             if ((config_link = link->dstpad->config_props))                if ((ret = config_link(link)) < 0) {                    av_log(link->dst, AV_LOG_ERROR,                           "Failed to configure input pad on %s\n",                           link->dst->name);                    return ret;                }             link->init_state = AVLINK_INIT;        }    }     return 0;} void ff_tlog_link(void *ctx, AVFilterLink *link, int end){    if (link->type == AVMEDIA_TYPE_VIDEO) {        ff_tlog(ctx,                "link[%p s:%dx%d fmt:%s %s->%s]%s",                link, link->w, link->h,                av_get_pix_fmt_name(link->format),                link->src ? link->src->filter->name : "",                link->dst ? link->dst->filter->name : "",                end ? "\n" : "");    } else {        char buf[128];        av_get_channel_layout_string(buf, sizeof(buf), -1, link->channel_layout);         ff_tlog(ctx,                "link[%p r:%d cl:%s fmt:%s %s->%s]%s",                link, (int)link->sample_rate, buf,                av_get_sample_fmt_name(link->format),                link->src ? link->src->filter->name : "",                link->dst ? link->dst->filter->name : "",                end ? "\n" : "");    }} int ff_request_frame(AVFilterLink *link){    int ret = -1;    FF_TPRINTF_START(NULL, request_frame); ff_tlog_link(NULL, link, 1);     if (link->closed)        return AVERROR_EOF;    av_assert0(!link->frame_requested);    link->frame_requested = 1;    while (link->frame_requested) {        if (link->srcpad->request_frame)            ret = link->srcpad->request_frame(link);        else if (link->src->inputs[0])            ret = ff_request_frame(link->src->inputs[0]);        if (ret == AVERROR_EOF && link->partial_buf) {            AVFrame *pbuf = link->partial_buf;            link->partial_buf = NULL;            ret = ff_filter_frame_framed(link, pbuf);        }        if (ret < 0) {            link->frame_requested = 0;            if (ret == AVERROR_EOF)                link->closed = 1;        } else {            av_assert0(!link->frame_requested ||                       link->flags & FF_LINK_FLAG_REQUEST_LOOP);        }    }    return ret;} int ff_poll_frame(AVFilterLink *link){    int i, min = INT_MAX;     if (link->srcpad->poll_frame)        return link->srcpad->poll_frame(link);     for (i = 0; i < link->src->nb_inputs; i++) {        int val;        if (!link->src->inputs[i])            return -1;        val = ff_poll_frame(link->src->inputs[i]);        min = FFMIN(min, val);    }     return min;} static const char *const var_names[] = {   "t",   "n",   "pos",        NULL };enum                                   { VAR_T, VAR_N, VAR_POS, VAR_VARS_NB }; static int set_enable_expr(AVFilterContext *ctx, const char *expr){    int ret;    char *expr_dup;    AVExpr *old = ctx->enable;     if (!(ctx->filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE)) {        av_log(ctx, AV_LOG_ERROR, "Timeline ('enable' option) not supported "               "with filter '%s'\n", ctx->filter->name);        return AVERROR_PATCHWELCOME;    }     expr_dup = av_strdup(expr);    if (!expr_dup)        return AVERROR(ENOMEM);     if (!ctx->var_values) {        ctx->var_values = av_calloc(VAR_VARS_NB, sizeof(*ctx->var_values));        if (!ctx->var_values) {            av_free(expr_dup);            return AVERROR(ENOMEM);        }    }     ret = av_expr_parse((AVExpr**)&ctx->enable, expr_dup, var_names,                        NULL, NULL, NULL, NULL, 0, ctx->priv);    if (ret < 0) {        av_log(ctx->priv, AV_LOG_ERROR,               "Error when evaluating the expression '%s' for enable\n",               expr_dup);        av_free(expr_dup);        return ret;    }     av_expr_free(old);    av_free(ctx->enable_str);    ctx->enable_str = expr_dup;    return 0;} void ff_update_link_current_pts(AVFilterLink *link, int64_t pts){    if (pts == AV_NOPTS_VALUE)        return;    link->current_pts = av_rescale_q(pts, link->time_base, AV_TIME_BASE_Q);    /* TODO use duration */    if (link->graph && link->age_index >= 0)        ff_avfilter_graph_update_heap(link->graph, link);} int avfilter_process_command(AVFilterContext *filter, const char *cmd, const char *arg, char *res, int res_len, int flags){    if(!strcmp(cmd, "ping")){        char local_res[256] = {0};         if (!res) {            res = local_res;            res_len = sizeof(local_res);        }        av_strlcatf(res, res_len, "pong from:%s %s\n", filter->filter->name, filter->name);        if (res == local_res)            av_log(filter, AV_LOG_INFO, "%s", res);        return 0;    }else if(!strcmp(cmd, "enable")) {        return set_enable_expr(filter, arg);    }else if(filter->filter->process_command) {        return filter->filter->process_command(filter, cmd, arg, res, res_len, flags);    }    return AVERROR(ENOSYS);} static AVFilter *first_filter;static AVFilter **last_filter = &first_filter; #if !FF_API_NOCONST_GET_NAMEconst#endifAVFilter *avfilter_get_by_name(const char *name){    const AVFilter *f = NULL;     if (!name)        return NULL;     while ((f = avfilter_next(f)))        if (!strcmp(f->name, name))            return (AVFilter *)f;     return NULL;} int avfilter_register(AVFilter *filter){    AVFilter **f = last_filter;    int i;     /* the filter must select generic or internal exclusively */    av_assert0((filter->flags & AVFILTER_FLAG_SUPPORT_TIMELINE) != AVFILTER_FLAG_SUPPORT_TIMELINE);     for(i=0; filter->inputs && filter->inputs[i].name; i++) {        const AVFilterPad *input = &filter->inputs[i];        av_assert0(     !input->filter_frame                    || (!input->start_frame && !input->end_frame));    }     filter->next = NULL;     while(*f || avpriv_atomic_ptr_cas((void * volatile *)f, NULL, filter))        f = &(*f)->next;    last_filter = &filter->next;     return 0;} 

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