diff options
Diffstat (limited to 'libavfilter/vf_stack.c')
| -rw-r--r-- | libavfilter/vf_stack.c | 281 |
1 files changed, 281 insertions, 0 deletions
diff --git a/libavfilter/vf_stack.c b/libavfilter/vf_stack.c new file mode 100644 index 0000000000..03643b6f96 --- /dev/null +++ b/libavfilter/vf_stack.c @@ -0,0 +1,281 @@ +/* + * Copyright (c) 2015 Paul B. Mahol + * + * 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 + */ + +#include "libavutil/avstring.h" +#include "libavutil/imgutils.h" +#include "libavutil/opt.h" +#include "libavutil/pixdesc.h" + +#include "avfilter.h" +#include "formats.h" +#include "internal.h" +#include "framesync.h" +#include "video.h" + +typedef struct StackContext { + const AVClass *class; + const AVPixFmtDescriptor *desc; + int nb_inputs; + int shortest; + int is_vertical; + int nb_planes; + + AVFrame **frames; + FFFrameSync fs; +} StackContext; + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *pix_fmts = NULL; + int fmt, ret; + + for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); + if (!(desc->flags & AV_PIX_FMT_FLAG_PAL || + desc->flags & AV_PIX_FMT_FLAG_HWACCEL || + desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) && + (ret = ff_add_format(&pix_fmts, fmt)) < 0) + return ret; + } + + return ff_set_common_formats(ctx, pix_fmts); +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + StackContext *s = inlink->dst->priv; + return ff_framesync_filter_frame(&s->fs, inlink, in); +} + +static av_cold int init(AVFilterContext *ctx) +{ + StackContext *s = ctx->priv; + int i, ret; + + if (!strcmp(ctx->filter->name, "vstack")) + s->is_vertical = 1; + + s->frames = av_calloc(s->nb_inputs, sizeof(*s->frames)); + if (!s->frames) + return AVERROR(ENOMEM); + + for (i = 0; i < s->nb_inputs; i++) { + AVFilterPad pad = { 0 }; + + pad.type = AVMEDIA_TYPE_VIDEO; + pad.name = av_asprintf("input%d", i); + if (!pad.name) + return AVERROR(ENOMEM); + pad.filter_frame = filter_frame; + + if ((ret = ff_insert_inpad(ctx, i, &pad)) < 0) { + av_freep(&pad.name); + return ret; + } + } + + return 0; +} + +static int process_frame(FFFrameSync *fs) +{ + AVFilterContext *ctx = fs->parent; + AVFilterLink *outlink = ctx->outputs[0]; + StackContext *s = fs->opaque; + AVFrame **in = s->frames; + AVFrame *out; + int i, p, ret, offset[4] = { 0 }; + + for (i = 0; i < s->nb_inputs; i++) { + if ((ret = ff_framesync_get_frame(&s->fs, i, &in[i], 0)) < 0) + return ret; + } + + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) + return AVERROR(ENOMEM); + out->pts = av_rescale_q(s->fs.pts, s->fs.time_base, outlink->time_base); + + for (i = 0; i < s->nb_inputs; i++) { + AVFilterLink *inlink = ctx->inputs[i]; + int linesize[4]; + int height[4]; + + if ((ret = av_image_fill_linesizes(linesize, inlink->format, inlink->w)) < 0) { + av_frame_free(&out); + return ret; + } + + height[1] = height[2] = AV_CEIL_RSHIFT(inlink->h, s->desc->log2_chroma_h); + height[0] = height[3] = inlink->h; + + for (p = 0; p < s->nb_planes; p++) { + if (s->is_vertical) { + av_image_copy_plane(out->data[p] + offset[p] * out->linesize[p], + out->linesize[p], + in[i]->data[p], + in[i]->linesize[p], + linesize[p], height[p]); + offset[p] += height[p]; + } else { + av_image_copy_plane(out->data[p] + offset[p], + out->linesize[p], + in[i]->data[p], + in[i]->linesize[p], + linesize[p], height[p]); + offset[p] += linesize[p]; + } + } + } + + return ff_filter_frame(outlink, out); +} + +static int config_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + StackContext *s = ctx->priv; + AVRational time_base = ctx->inputs[0]->time_base; + AVRational frame_rate = ctx->inputs[0]->frame_rate; + int height = ctx->inputs[0]->h; + int width = ctx->inputs[0]->w; + FFFrameSyncIn *in; + int i, ret; + + if (s->is_vertical) { + for (i = 1; i < s->nb_inputs; i++) { + if (ctx->inputs[i]->w != width) { + av_log(ctx, AV_LOG_ERROR, "Input %d width %d does not match input %d width %d.\n", i, ctx->inputs[i]->w, 0, width); + return AVERROR(EINVAL); + } + height += ctx->inputs[i]->h; + } + } else { + for (i = 1; i < s->nb_inputs; i++) { + if (ctx->inputs[i]->h != height) { + av_log(ctx, AV_LOG_ERROR, "Input %d height %d does not match input %d height %d.\n", i, ctx->inputs[i]->h, 0, height); + return AVERROR(EINVAL); + } + width += ctx->inputs[i]->w; + } + } + + s->desc = av_pix_fmt_desc_get(outlink->format); + if (!s->desc) + return AVERROR_BUG; + s->nb_planes = av_pix_fmt_count_planes(outlink->format); + + outlink->w = width; + outlink->h = height; + outlink->time_base = time_base; + outlink->frame_rate = frame_rate; + + if ((ret = ff_framesync_init(&s->fs, ctx, s->nb_inputs)) < 0) + return ret; + + in = s->fs.in; + s->fs.opaque = s; + s->fs.on_event = process_frame; + + for (i = 0; i < s->nb_inputs; i++) { + AVFilterLink *inlink = ctx->inputs[i]; + + in[i].time_base = inlink->time_base; + in[i].sync = 1; + in[i].before = EXT_STOP; + in[i].after = s->shortest ? EXT_STOP : EXT_INFINITY; + } + + return ff_framesync_configure(&s->fs); +} + +static int request_frame(AVFilterLink *outlink) +{ + StackContext *s = outlink->src->priv; + return ff_framesync_request_frame(&s->fs, outlink); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + StackContext *s = ctx->priv; + int i; + + ff_framesync_uninit(&s->fs); + av_freep(&s->frames); + + for (i = 0; i < ctx->nb_inputs; i++) + av_freep(&ctx->input_pads[i].name); +} + +#define OFFSET(x) offsetof(StackContext, x) +#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_FILTERING_PARAM +static const AVOption stack_options[] = { + { "inputs", "set number of inputs", OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64=2}, 2, INT_MAX, .flags = FLAGS }, + { "shortest", "force termination when the shortest input terminates", OFFSET(shortest), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, .flags = FLAGS }, + { NULL }, +}; + +static const AVFilterPad outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output, + .request_frame = request_frame, + }, + { NULL } +}; + +#if CONFIG_HSTACK_FILTER + +#define hstack_options stack_options +AVFILTER_DEFINE_CLASS(hstack); + +AVFilter ff_vf_hstack = { + .name = "hstack", + .description = NULL_IF_CONFIG_SMALL("Stack video inputs horizontally."), + .priv_size = sizeof(StackContext), + .priv_class = &hstack_class, + .query_formats = query_formats, + .outputs = outputs, + .init = init, + .uninit = uninit, + .flags = AVFILTER_FLAG_DYNAMIC_INPUTS, +}; + +#endif /* CONFIG_HSTACK_FILTER */ + +#if CONFIG_VSTACK_FILTER + +#define vstack_options stack_options +AVFILTER_DEFINE_CLASS(vstack); + +AVFilter ff_vf_vstack = { + .name = "vstack", + .description = NULL_IF_CONFIG_SMALL("Stack video inputs vertically."), + .priv_size = sizeof(StackContext), + .priv_class = &vstack_class, + .query_formats = query_formats, + .outputs = outputs, + .init = init, + .uninit = uninit, + .flags = AVFILTER_FLAG_DYNAMIC_INPUTS, +}; + +#endif /* CONFIG_VSTACK_FILTER */ |