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ffmpeg / libavfilter / vsrc_buffer.c @ e2f48c05

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/*
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 * Copyright (c) 2008 Vitor Sessak
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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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/**
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 * @file
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 * memory buffer source filter
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 */
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#include "avfilter.h"
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#include "vsrc_buffer.h"
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#include "libavutil/pixdesc.h"
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typedef struct {
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    int64_t           pts;
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    AVFrame           frame;
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    int               has_frame;
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    int               h, w;
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    enum PixelFormat  pix_fmt;
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    AVRational        pixel_aspect;
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} BufferSourceContext;
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int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,
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                             int64_t pts, AVRational pixel_aspect)
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{
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    BufferSourceContext *c = buffer_filter->priv;
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    if (c->has_frame) {
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        av_log(buffer_filter, AV_LOG_ERROR,
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               "Buffering several frames is not supported. "
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               "Please consume all available frames before adding a new one.\n"
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            );
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        //return -1;
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    }
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    memcpy(c->frame.data    , frame->data    , sizeof(frame->data));
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    memcpy(c->frame.linesize, frame->linesize, sizeof(frame->linesize));
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    c->frame.interlaced_frame= frame->interlaced_frame;
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    c->frame.top_field_first = frame->top_field_first;
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    c->pts = pts;
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    c->pixel_aspect = pixel_aspect;
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    c->has_frame = 1;
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    return 0;
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}
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
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{
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    BufferSourceContext *c = ctx->priv;
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    int n = 0;
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    if (!args || (n = sscanf(args, "%d:%d:%d", &c->w, &c->h, &c->pix_fmt)) != 3) {
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        av_log(ctx, AV_LOG_ERROR, "Expected 3 arguments, but only %d found in '%s'\n", n, args ? args : "");
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        return AVERROR(EINVAL);
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    }
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    av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);
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    return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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    BufferSourceContext *c = ctx->priv;
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    enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
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    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
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    return 0;
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}
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static int config_props(AVFilterLink *link)
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{
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    BufferSourceContext *c = link->src->priv;
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    link->w = c->w;
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    link->h = c->h;
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    return 0;
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}
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static int request_frame(AVFilterLink *link)
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{
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    BufferSourceContext *c = link->src->priv;
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    AVFilterPicRef *picref;
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    if (!c->has_frame) {
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        av_log(link->src, AV_LOG_ERROR,
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               "request_frame() called with no available frame!\n");
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        //return -1;
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    }
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    /* This picture will be needed unmodified later for decoding the next
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     * frame */
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    picref = avfilter_get_video_buffer(link, AV_PERM_WRITE | AV_PERM_PRESERVE |
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                                       AV_PERM_REUSE2,
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                                       link->w, link->h);
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    av_picture_copy((AVPicture *)&picref->data, (AVPicture *)&c->frame,
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                    picref->pic->format, link->w, link->h);
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    picref->pts             = c->pts;
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    picref->pixel_aspect    = c->pixel_aspect;
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    picref->interlaced      = c->frame.interlaced_frame;
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    picref->top_field_first = c->frame.top_field_first;
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    avfilter_start_frame(link, avfilter_ref_pic(picref, ~0));
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    avfilter_draw_slice(link, 0, link->h, 1);
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    avfilter_end_frame(link);
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    avfilter_unref_pic(picref);
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    c->has_frame = 0;
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    return 0;
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}
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static int poll_frame(AVFilterLink *link)
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{
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    BufferSourceContext *c = link->src->priv;
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    return !!(c->has_frame);
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}
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AVFilter avfilter_vsrc_buffer = {
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    .name      = "buffer",
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    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
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    .priv_size = sizeof(BufferSourceContext),
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    .query_formats = query_formats,
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    .init      = init,
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    .inputs    = (AVFilterPad[]) {{ .name = NULL }},
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    .outputs   = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO,
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                                    .request_frame   = request_frame,
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                                    .poll_frame      = poll_frame,
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                                    .config_props    = config_props, },
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                                  { .name = NULL}},
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};