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- /*
- * Copyright (c) 2008 Vitor Sessak
- *
- * 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
- */
- /**
- * @file
- * memory buffer source filter
- */
- #include "avfilter.h"
- #include "avcodec.h"
- #include "vsrc_buffer.h"
- #include "libavutil/imgutils.h"
- typedef struct {
- AVFilterBufferRef *picref;
- int h, w;
- enum PixelFormat pix_fmt;
- AVRational time_base; ///< time_base to set in the output link
- AVRational sample_aspect_ratio;
- char sws_param[256];
- } BufferSourceContext;
- int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter,
- AVFilterBufferRef *picref, int flags)
- {
- BufferSourceContext *c = buffer_filter->priv;
- AVFilterLink *outlink = buffer_filter->outputs[0];
- int ret;
- if (c->picref) {
- if (flags & AV_VSRC_BUF_FLAG_OVERWRITE) {
- avfilter_unref_buffer(c->picref);
- c->picref = NULL;
- } else {
- av_log(buffer_filter, AV_LOG_ERROR,
- "Buffering several frames is not supported. "
- "Please consume all available frames before adding a new one.\n");
- return AVERROR(EINVAL);
- }
- }
- if (picref->video->w != c->w || picref->video->h != c->h || picref->format != c->pix_fmt) {
- AVFilterContext *scale = buffer_filter->outputs[0]->dst;
- AVFilterLink *link;
- char scale_param[1024];
- av_log(buffer_filter, AV_LOG_INFO,
- "Buffer video input changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
- c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
- picref->video->w, picref->video->h, av_pix_fmt_descriptors[picref->format].name);
- if (!scale || strcmp(scale->filter->name, "scale")) {
- AVFilter *f = avfilter_get_by_name("scale");
- av_log(buffer_filter, AV_LOG_INFO, "Inserting scaler filter\n");
- if ((ret = avfilter_open(&scale, f, "Input equalizer")) < 0)
- return ret;
- snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s", c->w, c->h, c->sws_param);
- if ((ret = avfilter_init_filter(scale, scale_param, NULL)) < 0) {
- avfilter_free(scale);
- return ret;
- }
- if ((ret = avfilter_insert_filter(buffer_filter->outputs[0], scale, 0, 0)) < 0) {
- avfilter_free(scale);
- return ret;
- }
- scale->outputs[0]->time_base = scale->inputs[0]->time_base;
- scale->outputs[0]->format= c->pix_fmt;
- } else if (!strcmp(scale->filter->name, "scale")) {
- snprintf(scale_param, sizeof(scale_param)-1, "%d:%d:%s",
- scale->outputs[0]->w, scale->outputs[0]->h, c->sws_param);
- scale->filter->init(scale, scale_param, NULL);
- }
- c->pix_fmt = scale->inputs[0]->format = picref->format;
- c->w = scale->inputs[0]->w = picref->video->w;
- c->h = scale->inputs[0]->h = picref->video->h;
- link = scale->outputs[0];
- if ((ret = link->srcpad->config_props(link)) < 0)
- return ret;
- }
- c->picref = avfilter_get_video_buffer(outlink, AV_PERM_WRITE,
- picref->video->w, picref->video->h);
- av_image_copy(c->picref->data, c->picref->linesize,
- picref->data, picref->linesize,
- picref->format, picref->video->w, picref->video->h);
- avfilter_copy_buffer_ref_props(c->picref, picref);
- return 0;
- }
- #if CONFIG_AVCODEC
- #include "avcodec.h"
- int av_vsrc_buffer_add_frame(AVFilterContext *buffer_src,
- const AVFrame *frame, int flags)
- {
- int ret;
- AVFilterBufferRef *picref =
- avfilter_get_video_buffer_ref_from_frame(frame, AV_PERM_WRITE);
- if (!picref)
- return AVERROR(ENOMEM);
- ret = av_vsrc_buffer_add_video_buffer_ref(buffer_src, picref, flags);
- picref->buf->data[0] = NULL;
- avfilter_unref_buffer(picref);
- return ret;
- }
- #endif
- static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
- {
- BufferSourceContext *c = ctx->priv;
- char pix_fmt_str[128];
- int n = 0;
- *c->sws_param = 0;
- if (!args ||
- (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d:%255c", &c->w, &c->h, pix_fmt_str,
- &c->time_base.num, &c->time_base.den,
- &c->sample_aspect_ratio.num, &c->sample_aspect_ratio.den, c->sws_param)) < 7) {
- av_log(ctx, AV_LOG_ERROR, "Expected at least 7 arguments, but only %d found in '%s'\n", n, args);
- return AVERROR(EINVAL);
- }
- if ((c->pix_fmt = av_get_pix_fmt(pix_fmt_str)) == PIX_FMT_NONE) {
- char *tail;
- c->pix_fmt = strtol(pix_fmt_str, &tail, 10);
- if (*tail || c->pix_fmt < 0 || c->pix_fmt >= PIX_FMT_NB) {
- av_log(ctx, AV_LOG_ERROR, "Invalid pixel format string '%s'\n", pix_fmt_str);
- return AVERROR(EINVAL);
- }
- }
- av_log(ctx, AV_LOG_INFO, "w:%d h:%d pixfmt:%s tb:%d/%d sar:%d/%d sws_param:%s\n",
- c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name,
- c->time_base.num, c->time_base.den,
- c->sample_aspect_ratio.num, c->sample_aspect_ratio.den, c->sws_param);
- return 0;
- }
- static int query_formats(AVFilterContext *ctx)
- {
- BufferSourceContext *c = ctx->priv;
- enum PixelFormat pix_fmts[] = { c->pix_fmt, PIX_FMT_NONE };
- avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
- return 0;
- }
- static int config_props(AVFilterLink *link)
- {
- BufferSourceContext *c = link->src->priv;
- link->w = c->w;
- link->h = c->h;
- link->sample_aspect_ratio = c->sample_aspect_ratio;
- link->time_base = c->time_base;
- return 0;
- }
- static int request_frame(AVFilterLink *link)
- {
- BufferSourceContext *c = link->src->priv;
- if (!c->picref) {
- av_log(link->src, AV_LOG_WARNING,
- "request_frame() called with no available frame!\n");
- return AVERROR(EINVAL);
- }
- avfilter_start_frame(link, avfilter_ref_buffer(c->picref, ~0));
- avfilter_draw_slice(link, 0, link->h, 1);
- avfilter_end_frame(link);
- avfilter_unref_buffer(c->picref);
- c->picref = NULL;
- return 0;
- }
- static int poll_frame(AVFilterLink *link)
- {
- BufferSourceContext *c = link->src->priv;
- return !!(c->picref);
- }
- AVFilter avfilter_vsrc_buffer = {
- .name = "buffer",
- .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
- .priv_size = sizeof(BufferSourceContext),
- .query_formats = query_formats,
- .init = init,
- .inputs = (AVFilterPad[]) {{ .name = NULL }},
- .outputs = (AVFilterPad[]) {{ .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .request_frame = request_frame,
- .poll_frame = poll_frame,
- .config_props = config_props, },
- { .name = NULL}},
- };
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