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ffmpeg / libavfilter / avfilter.c @ 7fce481a

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/*
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 * filter layer
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 * copyright (c) 2007 Bobby Bingham
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/* #define DEBUG */
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#include "libavcodec/imgconvert.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
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#include "internal.h"
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unsigned avfilter_version(void) {
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    return LIBAVFILTER_VERSION_INT;
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}
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const char *avfilter_configuration(void)
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{
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    return FFMPEG_CONFIGURATION;
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}
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const char *avfilter_license(void)
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{
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#define LICENSE_PREFIX "libavfilter license: "
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    return LICENSE_PREFIX FFMPEG_LICENSE + sizeof(LICENSE_PREFIX) - 1;
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}
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/** helper macros to get the in/out pad on the dst/src filter */
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#define link_dpad(link)     link->dst-> input_pads[link->dstpad]
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#define link_spad(link)     link->src->output_pads[link->srcpad]
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AVFilterBufferRef *avfilter_ref_buffer(AVFilterBufferRef *ref, int pmask)
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{
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    AVFilterBufferRef *ret = av_malloc(sizeof(AVFilterBufferRef));
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    *ret = *ref;
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    ret->perms &= pmask;
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    ret->buf->refcount ++;
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    return ret;
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}
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void avfilter_unref_buffer(AVFilterBufferRef *ref)
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{
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    if(!(--ref->buf->refcount))
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        ref->buf->free(ref->buf);
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    av_free(ref);
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}
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void avfilter_insert_pad(unsigned idx, unsigned *count, size_t padidx_off,
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                         AVFilterPad **pads, AVFilterLink ***links,
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                         AVFilterPad *newpad)
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{
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    unsigned i;
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    idx = FFMIN(idx, *count);
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    *pads  = av_realloc(*pads,  sizeof(AVFilterPad)   * (*count + 1));
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    *links = av_realloc(*links, sizeof(AVFilterLink*) * (*count + 1));
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    memmove(*pads +idx+1, *pads +idx, sizeof(AVFilterPad)   * (*count-idx));
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    memmove(*links+idx+1, *links+idx, sizeof(AVFilterLink*) * (*count-idx));
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    memcpy(*pads+idx, newpad, sizeof(AVFilterPad));
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    (*links)[idx] = NULL;
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    (*count) ++;
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    for(i = idx+1; i < *count; i ++)
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        if(*links[i])
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            (*(unsigned *)((uint8_t *) *links[i] + padidx_off)) ++;
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}
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int avfilter_link(AVFilterContext *src, unsigned srcpad,
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                  AVFilterContext *dst, unsigned dstpad)
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{
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    AVFilterLink *link;
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    if(src->output_count <= srcpad || dst->input_count <= dstpad ||
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       src->outputs[srcpad]        || dst->inputs[dstpad])
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        return -1;
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    src->outputs[srcpad] =
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    dst-> inputs[dstpad] = link = av_mallocz(sizeof(AVFilterLink));
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    link->src     = src;
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    link->dst     = dst;
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    link->srcpad  = srcpad;
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    link->dstpad  = dstpad;
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    link->type    = src->output_pads[srcpad].type;
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    assert(PIX_FMT_NONE == -1 && SAMPLE_FMT_NONE == -1);
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    link->format  = -1;
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    return 0;
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}
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int avfilter_insert_filter(AVFilterLink *link, AVFilterContext *filt,
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                           unsigned in, unsigned out)
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{
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    av_log(link->dst, AV_LOG_INFO, "auto-inserting filter '%s' "
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           "between the filter '%s' and the filter '%s'\n",
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           filt->name, link->src->name, link->dst->name);
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    link->dst->inputs[link->dstpad] = NULL;
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    if(avfilter_link(filt, out, link->dst, link->dstpad)) {
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        /* failed to link output filter to new filter */
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        link->dst->inputs[link->dstpad] = link;
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        return -1;
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    }
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    /* re-hookup the link to the new destination filter we inserted */
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    link->dst = filt;
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    link->dstpad = in;
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    filt->inputs[in] = link;
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    /* if any information on supported media formats already exists on the
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     * link, we need to preserve that */
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    if(link->out_formats)
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        avfilter_formats_changeref(&link->out_formats,
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                                   &filt->outputs[out]->out_formats);
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    return 0;
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}
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int avfilter_config_links(AVFilterContext *filter)
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{
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    int (*config_link)(AVFilterLink *);
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    unsigned i;
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    for(i = 0; i < filter->input_count; i ++) {
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        AVFilterLink *link = filter->inputs[i];
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        if(!link) continue;
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        switch(link->init_state) {
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        case AVLINK_INIT:
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            continue;
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        case AVLINK_STARTINIT:
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            av_log(filter, AV_LOG_INFO, "circular filter chain detected\n");
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            return 0;
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        case AVLINK_UNINIT:
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            link->init_state = AVLINK_STARTINIT;
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            if(avfilter_config_links(link->src))
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                return -1;
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            if(!(config_link = link_spad(link).config_props))
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                config_link  = avfilter_default_config_output_link;
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            if(config_link(link))
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                return -1;
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            if((config_link = link_dpad(link).config_props))
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                if(config_link(link))
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                    return -1;
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            link->init_state = AVLINK_INIT;
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        }
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    }
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    return 0;
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}
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void ff_dprintf_picref(void *ctx, AVFilterBufferRef *picref, int end)
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{
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    dprintf(ctx,
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            "picref[%p data[%p, %p, %p, %p] linesize[%d, %d, %d, %d] pts:%"PRId64" pos:%"PRId64" a:%d/%d s:%dx%d]%s",
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            picref,
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            picref->data    [0], picref->data    [1], picref->data    [2], picref->data    [3],
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            picref->linesize[0], picref->linesize[1], picref->linesize[2], picref->linesize[3],
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            picref->pts, picref->pos,
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            picref->pixel_aspect.num, picref->pixel_aspect.den, picref->w, picref->h,
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            end ? "\n" : "");
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}
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void ff_dprintf_link(void *ctx, AVFilterLink *link, int end)
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{
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    dprintf(ctx,
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            "link[%p s:%dx%d fmt:%-16s %-16s->%-16s]%s",
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            link, link->w, link->h,
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            av_pix_fmt_descriptors[link->format].name,
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            link->src ? link->src->filter->name : "",
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            link->dst ? link->dst->filter->name : "",
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            end ? "\n" : "");
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}
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AVFilterBufferRef *avfilter_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
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{
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    AVFilterBufferRef *ret = NULL;
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    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " perms:%d w:%d h:%d\n", perms, w, h);
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    if(link_dpad(link).get_video_buffer)
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        ret = link_dpad(link).get_video_buffer(link, perms, w, h);
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    if(!ret)
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        ret = avfilter_default_get_video_buffer(link, perms, w, h);
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    FF_DPRINTF_START(NULL, get_video_buffer); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " returning "); ff_dprintf_picref(NULL, ret, 1);
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    return ret;
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}
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int avfilter_request_frame(AVFilterLink *link)
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{
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    FF_DPRINTF_START(NULL, request_frame); ff_dprintf_link(NULL, link, 1);
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    if(link_spad(link).request_frame)
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        return link_spad(link).request_frame(link);
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    else if(link->src->inputs[0])
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        return avfilter_request_frame(link->src->inputs[0]);
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    else return -1;
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}
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int avfilter_poll_frame(AVFilterLink *link)
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{
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    int i, min=INT_MAX;
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    if(link_spad(link).poll_frame)
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        return link_spad(link).poll_frame(link);
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    for (i=0; i<link->src->input_count; i++) {
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        int val;
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        if(!link->src->inputs[i])
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            return -1;
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        val = avfilter_poll_frame(link->src->inputs[i]);
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        min = FFMIN(min, val);
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    }
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    return min;
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}
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/* XXX: should we do the duplicating of the picture ref here, instead of
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 * forcing the source filter to do it? */
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void avfilter_start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
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{
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    void (*start_frame)(AVFilterLink *, AVFilterBufferRef *);
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    AVFilterPad *dst = &link_dpad(link);
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    FF_DPRINTF_START(NULL, start_frame); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " "); ff_dprintf_picref(NULL, picref, 1);
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    if(!(start_frame = dst->start_frame))
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        start_frame = avfilter_default_start_frame;
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    /* prepare to copy the picture if it has insufficient permissions */
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    if((dst->min_perms & picref->perms) != dst->min_perms ||
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        dst->rej_perms & picref->perms) {
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        /*
259
        av_log(link->dst, AV_LOG_INFO,
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                "frame copy needed (have perms %x, need %x, reject %x)\n",
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                picref->perms,
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                link_dpad(link).min_perms, link_dpad(link).rej_perms);
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        */
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265
        link->cur_pic = avfilter_default_get_video_buffer(link, dst->min_perms, link->w, link->h);
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        link->srcpic = picref;
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        avfilter_copy_buffer_ref_props(link->cur_pic, link->srcpic);
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    }
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    else
270
        link->cur_pic = picref;
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    start_frame(link, link->cur_pic);
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}
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void avfilter_end_frame(AVFilterLink *link)
276
{
277
    void (*end_frame)(AVFilterLink *);
278

    
279
    if(!(end_frame = link_dpad(link).end_frame))
280
        end_frame = avfilter_default_end_frame;
281

    
282
    end_frame(link);
283

    
284
    /* unreference the source picture if we're feeding the destination filter
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     * a copied version dues to permission issues */
286
    if(link->srcpic) {
287
        avfilter_unref_buffer(link->srcpic);
288
        link->srcpic = NULL;
289
    }
290

    
291
}
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293
void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
294
{
295
    uint8_t *src[4], *dst[4];
296
    int i, j, vsub;
297
    void (*draw_slice)(AVFilterLink *, int, int, int);
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299
    FF_DPRINTF_START(NULL, draw_slice); ff_dprintf_link(NULL, link, 0); dprintf(NULL, " y:%d h:%d dir:%d\n", y, h, slice_dir);
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    /* copy the slice if needed for permission reasons */
302
    if(link->srcpic) {
303
        vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;
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305
        for(i = 0; i < 4; i ++) {
306
            if(link->srcpic->data[i]) {
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                src[i] = link->srcpic-> data[i] +
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                    (y >> (i==0 ? 0 : vsub)) * link->srcpic-> linesize[i];
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                dst[i] = link->cur_pic->data[i] +
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                    (y >> (i==0 ? 0 : vsub)) * link->cur_pic->linesize[i];
311
            } else
312
                src[i] = dst[i] = NULL;
313
        }
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315
        for(i = 0; i < 4; i ++) {
316
            int planew =
317
                ff_get_plane_bytewidth(link->format, link->cur_pic->w, i);
318

    
319
            if(!src[i]) continue;
320

    
321
            for(j = 0; j < h >> (i==0 ? 0 : vsub); j ++) {
322
                memcpy(dst[i], src[i], planew);
323
                src[i] += link->srcpic ->linesize[i];
324
                dst[i] += link->cur_pic->linesize[i];
325
            }
326
        }
327
    }
328

    
329
    if(!(draw_slice = link_dpad(link).draw_slice))
330
        draw_slice = avfilter_default_draw_slice;
331
    draw_slice(link, y, h, slice_dir);
332
}
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334
#define MAX_REGISTERED_AVFILTERS_NB 64
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336
static AVFilter *registered_avfilters[MAX_REGISTERED_AVFILTERS_NB + 1];
337

    
338
static int next_registered_avfilter_idx = 0;
339

    
340
AVFilter *avfilter_get_by_name(const char *name)
341
{
342
    int i;
343

    
344
    for (i = 0; registered_avfilters[i]; i++)
345
        if (!strcmp(registered_avfilters[i]->name, name))
346
            return registered_avfilters[i];
347

    
348
    return NULL;
349
}
350

    
351
int avfilter_register(AVFilter *filter)
352
{
353
    if (next_registered_avfilter_idx == MAX_REGISTERED_AVFILTERS_NB)
354
        return -1;
355

    
356
    registered_avfilters[next_registered_avfilter_idx++] = filter;
357
    return 0;
358
}
359

    
360
AVFilter **av_filter_next(AVFilter **filter)
361
{
362
    return filter ? ++filter : &registered_avfilters[0];
363
}
364

    
365
void avfilter_uninit(void)
366
{
367
    memset(registered_avfilters, 0, sizeof(registered_avfilters));
368
    next_registered_avfilter_idx = 0;
369
}
370

    
371
static int pad_count(const AVFilterPad *pads)
372
{
373
    int count;
374

    
375
    for(count = 0; pads->name; count ++) pads ++;
376
    return count;
377
}
378

    
379
static const char *filter_name(void *p)
380
{
381
    AVFilterContext *filter = p;
382
    return filter->filter->name;
383
}
384

    
385
static const AVClass avfilter_class = {
386
    "AVFilter",
387
    filter_name,
388
    NULL,
389
    LIBAVUTIL_VERSION_INT,
390
};
391

    
392
AVFilterContext *avfilter_open(AVFilter *filter, const char *inst_name)
393
{
394
    AVFilterContext *ret;
395

    
396
    if (!filter)
397
        return 0;
398

    
399
    ret = av_mallocz(sizeof(AVFilterContext));
400

    
401
    ret->av_class = &avfilter_class;
402
    ret->filter   = filter;
403
    ret->name     = inst_name ? av_strdup(inst_name) : NULL;
404
    ret->priv     = av_mallocz(filter->priv_size);
405

    
406
    ret->input_count  = pad_count(filter->inputs);
407
    if (ret->input_count) {
408
        ret->input_pads   = av_malloc(sizeof(AVFilterPad) * ret->input_count);
409
        memcpy(ret->input_pads, filter->inputs, sizeof(AVFilterPad) * ret->input_count);
410
        ret->inputs       = av_mallocz(sizeof(AVFilterLink*) * ret->input_count);
411
    }
412

    
413
    ret->output_count = pad_count(filter->outputs);
414
    if (ret->output_count) {
415
        ret->output_pads  = av_malloc(sizeof(AVFilterPad) * ret->output_count);
416
        memcpy(ret->output_pads, filter->outputs, sizeof(AVFilterPad) * ret->output_count);
417
        ret->outputs      = av_mallocz(sizeof(AVFilterLink*) * ret->output_count);
418
    }
419

    
420
    return ret;
421
}
422

    
423
void avfilter_destroy(AVFilterContext *filter)
424
{
425
    int i;
426

    
427
    if(filter->filter->uninit)
428
        filter->filter->uninit(filter);
429

    
430
    for(i = 0; i < filter->input_count; i ++) {
431
        if(filter->inputs[i]) {
432
            if (filter->inputs[i]->src)
433
                filter->inputs[i]->src->outputs[filter->inputs[i]->srcpad] = NULL;
434
            avfilter_formats_unref(&filter->inputs[i]->in_formats);
435
            avfilter_formats_unref(&filter->inputs[i]->out_formats);
436
        }
437
        av_freep(&filter->inputs[i]);
438
    }
439
    for(i = 0; i < filter->output_count; i ++) {
440
        if(filter->outputs[i]) {
441
            if (filter->outputs[i]->dst)
442
                filter->outputs[i]->dst->inputs[filter->outputs[i]->dstpad] = NULL;
443
            avfilter_formats_unref(&filter->outputs[i]->in_formats);
444
            avfilter_formats_unref(&filter->outputs[i]->out_formats);
445
        }
446
        av_freep(&filter->outputs[i]);
447
    }
448

    
449
    av_freep(&filter->name);
450
    av_freep(&filter->input_pads);
451
    av_freep(&filter->output_pads);
452
    av_freep(&filter->inputs);
453
    av_freep(&filter->outputs);
454
    av_freep(&filter->priv);
455
    av_free(filter);
456
}
457

    
458
int avfilter_init_filter(AVFilterContext *filter, const char *args, void *opaque)
459
{
460
    int ret=0;
461

    
462
    if(filter->filter->init)
463
        ret = filter->filter->init(filter, args, opaque);
464
    return ret;
465
}
466