mirror of https://git.ffmpeg.org/ffmpeg.git
200 lines
6.2 KiB
C
200 lines
6.2 KiB
C
/*
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* Copyright (c) 2008 Vitor Sessak
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "buffersrc.h"
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#include "vsrc_buffer.h"
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#include "libavutil/fifo.h"
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#include "libavutil/imgutils.h"
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typedef struct {
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AVFifoBuffer *fifo;
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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 pixel_aspect;
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} BufferSourceContext;
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#define CHECK_PARAM_CHANGE(s, c, width, height, format)\
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if (c->w != width || c->h != height || c->pix_fmt != format) {\
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av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
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return AVERROR(EINVAL);\
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}
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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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AVFilterBufferRef *buf;
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int ret;
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if (!av_fifo_space(c->fifo) &&
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(ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
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sizeof(buf))) < 0)
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return ret;
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CHECK_PARAM_CHANGE(buffer_filter, c, frame->width, frame->height, frame->format);
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buf = avfilter_get_video_buffer(buffer_filter->outputs[0], AV_PERM_WRITE,
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c->w, c->h);
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av_image_copy(buf->data, buf->linesize, frame->data, frame->linesize,
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c->pix_fmt, c->w, c->h);
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avfilter_copy_frame_props(buf, frame);
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buf->pts = pts;
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buf->video->pixel_aspect = pixel_aspect;
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if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0) {
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avfilter_unref_buffer(buf);
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return ret;
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}
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return 0;
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}
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int av_buffersrc_buffer(AVFilterContext *s, AVFilterBufferRef *buf)
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{
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BufferSourceContext *c = s->priv;
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int ret;
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if (!av_fifo_space(c->fifo) &&
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(ret = av_fifo_realloc2(c->fifo, av_fifo_size(c->fifo) +
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sizeof(buf))) < 0)
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return ret;
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CHECK_PARAM_CHANGE(s, c, buf->video->w, buf->video->h, buf->format);
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if ((ret = av_fifo_generic_write(c->fifo, &buf, sizeof(buf), NULL)) < 0)
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return ret;
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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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char pix_fmt_str[128];
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int n = 0;
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if (!args ||
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(n = sscanf(args, "%d:%d:%127[^:]:%d:%d:%d:%d", &c->w, &c->h, pix_fmt_str,
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&c->time_base.num, &c->time_base.den,
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&c->pixel_aspect.num, &c->pixel_aspect.den)) != 7) {
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av_log(ctx, AV_LOG_ERROR, "Expected 7 arguments, but %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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if (!(c->fifo = av_fifo_alloc(sizeof(AVFilterBufferRef*))))
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return AVERROR(ENOMEM);
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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);
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return 0;
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BufferSourceContext *s = ctx->priv;
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while (av_fifo_size(s->fifo)) {
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AVFilterBufferRef *buf;
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av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
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avfilter_unref_buffer(buf);
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}
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av_fifo_free(s->fifo);
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s->fifo = NULL;
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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->pixel_aspect;
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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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AVFilterBufferRef *buf;
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if (!av_fifo_size(c->fifo)) {
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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 AVERROR(EINVAL);
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}
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av_fifo_generic_read(c->fifo, &buf, sizeof(buf), NULL);
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avfilter_start_frame(link, avfilter_ref_buffer(buf, ~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(buf);
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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 !!av_fifo_size(c->fifo);
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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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.uninit = uninit,
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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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