| /* |
| * 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}}, |
| }; |