/* * Copyright (c) 2008 Vitor Sessak * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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 "buffersrc.h"#include "vsrc_buffer.h"#include "libavutil/imgutils.h" typedef struct {    AVFilterBufferRef *buf;    int               h, w;    enum PixelFormat  pix_fmt;    AVRational        time_base;     ///< time_base to set in the output link    AVRational        pixel_aspect;} BufferSourceContext; #define CHECK_PARAM_CHANGE(s, c, width, height, format)\    if (c->w != width || c->h != height || c->pix_fmt != format) {\        av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\        return AVERROR(EINVAL);\    } int av_vsrc_buffer_add_frame(AVFilterContext *buffer_filter, AVFrame *frame,                             int64_t pts, AVRational pixel_aspect){    BufferSourceContext *c = buffer_filter->priv;     if (c->buf) {        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;    }     CHECK_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height, frame->format);     c->buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,                                       c->w, c->h);    av_image_copy(c->buf->data, c->buf->linesize, frame->data, frame->linesize,                  c->pix_fmt, c->w, c->h);     avfilter_copy_frame_props(c->buf, frame);    c->buf->pts                    = pts;    c->buf->video->pixel_aspect    = pixel_aspect;     return 0;} int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf){    BufferSourceContext *c = s->priv;     if (c->buf) {        av_log(s, AV_LOG_ERROR,               "Buffering several frames is not supported. "               "Please consume all available frames before adding a new one.\n"            );        return AVERROR(EINVAL);    }     CHECK_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);     c->buf = buf;     return 0;} 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->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {        av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %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\n", c->w, c->h, av_pix_fmt_descriptors[c->pix_fmt].name);    return 0;} static av_cold void uninit(AVFilterContext *ctx){    BufferSourceContext *s = ctx->priv;    if (s->buf)        avfilter_unref_buffer(s->buf);    s->buf = NULL;} 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->pixel_aspect;    link->time_base = c->time_base;     return 0;} static int request_frame(AVFilterLink *link){    BufferSourceContext *c = link->src->priv;     if (!c->buf) {        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->buf, ~0));    avfilter_draw_slice(link, 0, link->h, 1);    avfilter_end_frame(link);    avfilter_unref_buffer(c->buf);    c->buf = NULL;     return 0;} static int poll_frame(AVFilterLink *link){    BufferSourceContext *c = link->src->priv;    return !!c->buf;} 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,    .uninit    = uninit,     .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}},};