mirror of https://git.ffmpeg.org/ffmpeg.git
219 lines
7.4 KiB
C
219 lines
7.4 KiB
C
/*
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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 "avcodec.h"
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#include "vsrc_buffer.h"
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#include "libavutil/imgutils.h"
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typedef struct {
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AVFilterBufferRef *picref;
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int h, w;
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enum PixelFormat pix_fmt;
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AVRational time_base; ///< time_base to set in the output link
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AVRational sample_aspect_ratio;
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char sws_param[256];
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} BufferSourceContext;
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int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter, AVFilterBufferRef *picref)
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{
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BufferSourceContext *c = buffer_filter->priv;
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AVFilterLink *outlink = buffer_filter->outputs[0];
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int ret;
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if (c->picref) {
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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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if (picref->video->w != c->w || picref->video->h != c->h || picref->format != c->pix_fmt) {
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AVFilterContext *scale = buffer_filter->outputs[0]->dst;
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AVFilterLink *link;
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char scale_param[1024];
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av_log(buffer_filter, AV_LOG_INFO,
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"Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
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c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
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picref->video->w, picref->video->h, av_pix_fmt_descriptors[picref->format].name);
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if (!scale || strcmp(scale->filter->name, "scale")) {
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AVFilter *f = avfilter_get_by_name("scale");
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av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
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if ((ret = avfilter_open(&scale, f, "Input equalizer")) < 0)
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return ret;
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snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s", c->w, c->h, c->sws_param);
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if ((ret = avfilter_init_filter(scale, scale_param, NULL)) < 0) {
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avfilter_free(scale);
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return ret;
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}
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if ((ret = avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0)) < 0) {
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avfilter_free(scale);
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return ret;
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}
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scale->outputs[0]->time_base = scale->inputs[0]->time_base;
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scale->outputs[0]->format= c->pix_fmt;
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} else if (!strcmp(scale->filter->name, "scale")) {
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snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s",
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scale->outputs[0]->w, scale->outputs[0]->h, c->sws_param);
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scale->filter->init(scale, scale_param, NULL);
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}
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c->pix_fmt = scale->inputs[0]->format = picref->format;
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c->w = scale->inputs[0]->w = picref->video->w;
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c->h = scale->inputs[0]->h = picref->video->h;
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link = scale->outputs[0];
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if ((ret = link->srcpad->config_props(link)) < 0)
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return ret;
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}
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c->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
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picref->video->w, picref->video->h);
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av_image_copy(c->picref->data, c->picref->linesize,
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picref->data, picref->linesize,
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picref->format, picref->video->w, picref->video->h);
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avfilter_copy_buffer_ref_props(c->picref, picref);
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return 0;
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}
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#if CONFIG_AVCODEC
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#include "avcodec.h"
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int av_vsrc_buffer_add_frame(AVFilterContext *buffer_src, const AVFrame *frame)
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{
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AVFilterBufferRef *picref =
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avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
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if (!picref)
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return AVERROR(ENOMEM);
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av_vsrc_buffer_add_video_buffer_ref(buffer_src, picref);
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picref->buf->data[0] = NULL;
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avfilter_unref_buffer(picref);
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return 0;
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}
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#endif
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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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char pix_fmt_str[128];
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int n = 0;
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*c->sws_param = 0;
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if (!args ||
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(n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
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&c->time_base.num, &c->time_base.den,
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&c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den, c->sws_param)) < 7) {
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av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
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return AVERROR(EINVAL);
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}
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if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
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char *tail;
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c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
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if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
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av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
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return AVERROR(EINVAL);
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}
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}
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av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",
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c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
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c->time_base.num, c->time_base.den,
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c->sample_aspect_ratio.num, c->sample_aspect_ratio.den, c->sws_param);
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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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link->sample_aspect_ratio = c->sample_aspect_ratio;
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link->time_base = c->time_base;
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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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if (!c->picref) {
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av_log(link->src, AV_LOG_WARNING,
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"request_frame() called with no available frame!\n");
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return AVERROR(EINVAL);
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}
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avfilter_start_frame(link, avfilter_ref_buffer(c->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_buffer(c->picref);
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c->picref = NULL;
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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->picref);
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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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};
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