/* * 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_ref2(AVFilterContext *buffer_filter, AVFilterBufferRef *picref, const char *sws_param) { BufferSourceContext *c = buffer_filter->priv; AVFilterLink *outlink = buffer_filter->outputs[0]; int ret; if (c->picref) { 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 -1; } if (!c->sws_param[0]) { snprintf(c->sws_param, 255, "%d:%d:%s", c->w, c->h, sws_param); } 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; 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; if ((ret = avfilter_init_filter(scale, c->sws_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(c->sws_param, 255, "%d:%d:%s", scale->outputs[0]->w, scale->outputs[0]->h, sws_param); scale->filter->init(scale, c->sws_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; } int av_vsrc_buffer_add_video_buffer_ref(AVFilterContext *buffer_filter, AVFilterBufferRef *picref) { return av_vsrc_buffer_add_video_buffer_ref2(buffer_filter, picref, ""); } static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) { BufferSourceContext *c = ctx->priv; char pix_fmt_str[128]; int n = 0; if (!args || (n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &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)) != 7) { av_log(ctx, AV_LOG_ERROR, "Expected 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\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); 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_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_ERROR, "request_frame() called with no available frame!\n"); //return -1; } 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}}, };