145 lines
4.3 KiB
C
145 lines
4.3 KiB
C
/*
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* Memory buffer source filter
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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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#include "avfilter.h"
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#include "vsrc_buffer.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, 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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if(args && sscanf(args, "%d:%d:%d", &c->w, &c->h, &c->pix_fmt) == 3)
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return 0;
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av_log(ctx, AV_LOG_ERROR, "init() expected 3 arguments:'%s'\n", args);
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return -1;
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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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{
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.name = "buffer",
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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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};
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