lavfi: add framepack filter

Changelog

@@ -54,6 +54,7 @@ version 10:
 - png standalone parser
 - WebP encoding via libwebp
 - ATRAC3+ decoder
+- framepack filter
 
 
 version 9:

doc/filters.texi

@@ -1252,6 +1252,51 @@ frames with a negative PTS.
 
 @end table
 
+@section framepack
+
+Pack two different video streams into a stereoscopic video, setting proper
+metadata on supported codecs. The two views should have the same size and
+framerate and processing will stop when the shorter video ends. Please note
+that you may conveniently adjust view properties with the @ref{scale} and
+@ref{fps} filters.
+
+This filter accepts the following named parameters:
+@table @option
+
+@item format
+Desired packing format. Supported values are:
+
+@table @option
+
+@item sbs
+Views are next to each other (default).
+
+@item tab
+Views are on top of each other.
+
+@item lines
+Views are packed by line.
+
+@item columns
+Views are eacked by column.
+
+@item frameseq
+Views are temporally interleaved.
+
+@end table
+
+@end table
+
+Some examples follow:
+
+@example
+# Convert left and right views into a frame sequential video.
+avconv -i LEFT -i RIGHT -filter_complex framepack=frameseq OUTPUT
+
+# Convert views into a side-by-side video with the same output resolution as the input.
+avconv -i LEFT -i RIGHT -filter_complex [0:v]scale=w=iw/2[left],[1:v]scale=w=iw/2[right],[left][right]framepack=sbs OUTPUT
+@end example
+
 @anchor{frei0r}
 @section frei0r
 

libavfilter/Makefile

@@ -54,6 +54,7 @@ OBJS-$(CONFIG_FADE_FILTER)                   += vf_fade.o
 OBJS-$(CONFIG_FIELDORDER_FILTER)             += vf_fieldorder.o
 OBJS-$(CONFIG_FORMAT_FILTER)                 += vf_format.o
 OBJS-$(CONFIG_FPS_FILTER)                    += vf_fps.o
+OBJS-$(CONFIG_FRAMEPACK_FILTER)              += vf_framepack.o
 OBJS-$(CONFIG_FREI0R_FILTER)                 += vf_frei0r.o
 OBJS-$(CONFIG_GRADFUN_FILTER)                += vf_gradfun.o
 OBJS-$(CONFIG_HFLIP_FILTER)                  += vf_hflip.o

libavfilter/allfilters.c

@@ -74,6 +74,7 @@ void avfilter_register_all(void)
     REGISTER_FILTER(FIELDORDER,     fieldorder,     vf);
     REGISTER_FILTER(FORMAT,         format,         vf);
     REGISTER_FILTER(FPS,            fps,            vf);
+    REGISTER_FILTER(FRAMEPACK,      framepack,      vf);
     REGISTER_FILTER(FREI0R,         frei0r,         vf);
     REGISTER_FILTER(GRADFUN,        gradfun,        vf);
     REGISTER_FILTER(HFLIP,          hflip,          vf);

libavfilter/version.h

@@ -30,7 +30,7 @@
 #include "libavutil/version.h"
 
 #define LIBAVFILTER_VERSION_MAJOR  4
-#define LIBAVFILTER_VERSION_MINOR  0
+#define LIBAVFILTER_VERSION_MINOR  1
 #define LIBAVFILTER_VERSION_MICRO  0
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

libavfilter/vf_framepack.c

+/*
+ * Copyright (c) 2013 Vittorio Giovara
+ *
+ * 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
+ * Generate a frame packed video, by combining two views in a single surface.
+ */
+
+#include <string.h>
+
+#include "libavutil/imgutils.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/rational.h"
+#include "libavutil/stereo3d.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define LEFT  0
+#define RIGHT 1
+
+typedef struct FramepackContext {
+    const AVClass *class;
+
+    const AVPixFmtDescriptor *pix_desc; ///< agreed pixel format
+
+    enum AVStereo3DType format;         ///< frame pack type output
+
+    AVFrame *input_views[2];            ///< input frames
+
+    int64_t double_pts;                 ///< new pts for frameseq mode
+} FramepackContext;
+
+static const enum AVPixelFormat formats_supported[] = {
+    AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
+    AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVJ420P,
+    AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P,
+    AV_PIX_FMT_NONE
+};
+
+static int query_formats(AVFilterContext *ctx)
+{
+    // this will ensure that formats are the same on all pads
+    ff_set_common_formats(ctx, ff_make_format_list(formats_supported));
+    return 0;
+}
+
+static av_cold void framepack_uninit(AVFilterContext *ctx)
+{
+    FramepackContext *s = ctx->priv;
+
+    // clean any leftover frame
+    av_frame_free(&s->input_views[LEFT]);
+    av_frame_free(&s->input_views[RIGHT]);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    FramepackContext *s  = outlink->src->priv;
+
+    int width            = ctx->inputs[LEFT]->w;
+    int height           = ctx->inputs[LEFT]->h;
+    AVRational time_base = ctx->inputs[LEFT]->time_base;
+
+    // check size and fps match on the other input
+    if (width  != ctx->inputs[RIGHT]->w ||
+        height != ctx->inputs[RIGHT]->h) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Left and right sizes differ (%dx%d vs %dx%d).\n",
+               width, height,
+               ctx->inputs[RIGHT]->w, ctx->inputs[RIGHT]->h);
+        return AVERROR_INVALIDDATA;
+    } else if (av_cmp_q(time_base, ctx->inputs[RIGHT]->time_base) != 0) {
+        av_log(ctx, AV_LOG_ERROR,
+               "Left and right framerates differ (%d/%d vs %d/%d).\n",
+               time_base.num, time_base.den,
+               ctx->inputs[RIGHT]->time_base.num,
+               ctx->inputs[RIGHT]->time_base.den);
+        return AVERROR_INVALIDDATA;
+    }
+
+    s->pix_desc = av_pix_fmt_desc_get(outlink->format);
+    if (!s->pix_desc)
+        return AVERROR_BUG;
+
+    // modify output properties as needed
+    switch (s->format) {
+    case AV_STEREO3D_FRAMESEQUENCE:
+        time_base.den *= 2;
+        s->double_pts = AV_NOPTS_VALUE;
+        break;
+    case AV_STEREO3D_COLUMNS:
+    case AV_STEREO3D_SIDEBYSIDE:
+        width *= 2;
+        break;
+    case AV_STEREO3D_LINES:
+    case AV_STEREO3D_TOPBOTTOM:
+        height *= 2;
+        break;
+    default:
+        av_log(ctx, AV_LOG_ERROR, "Unknown packing mode.");
+        return AVERROR_INVALIDDATA;
+    }
+
+    outlink->w         = width;
+    outlink->h         = height;
+    outlink->time_base = time_base;
+
+    return 0;
+}
+
+static void horizontal_frame_pack(FramepackContext *s,
+                                  AVFrame *dst,
+                                  int interleaved)
+{
+    int plane, i;
+    int length = dst->width / 2;
+    int lines  = dst->height;
+
+    for (plane = 0; plane < s->pix_desc->nb_components; plane++) {
+        const uint8_t *leftp  = s->input_views[LEFT]->data[plane];
+        const uint8_t *rightp = s->input_views[RIGHT]->data[plane];
+        uint8_t *dstp         = dst->data[plane];
+
+        if (plane == 1 || plane == 2) {
+            length = -(-(dst->width / 2) >> s->pix_desc->log2_chroma_w);
+            lines  = -(-(dst->height)    >> s->pix_desc->log2_chroma_h);
+        }
+
+        if (interleaved) {
+            for (i = 0; i < lines; i++) {
+                int j;
+                int k = 0;
+
+                for (j = 0; j < length; j++) {
+                    dstp[k++] = leftp[j];
+                    dstp[k++] = rightp[j];
+                }
+
+                dstp   += dst->linesize[plane];
+                leftp  += s->input_views[LEFT]->linesize[plane];
+                rightp += s->input_views[RIGHT]->linesize[plane];
+            }
+        } else {
+            av_image_copy_plane(dst->data[plane], dst->linesize[plane],
+                                leftp, s->input_views[LEFT]->linesize[plane],
+                                length, lines);
+            av_image_copy_plane(dst->data[plane] + length, dst->linesize[plane],
+                                rightp, s->input_views[RIGHT]->linesize[plane],
+                                length, lines);
+        }
+    }
+}
+
+static void vertical_frame_pack(FramepackContext *s,
+                                AVFrame *dst,
+                                int interleaved)
+{
+    int plane, offset;
+    int length = dst->width;
+    int lines  = dst->height / 2;
+
+    for (plane = 0; plane < s->pix_desc->nb_components; plane++) {
+        if (plane == 1 || plane == 2) {
+            length = -(-(dst->width)      >> s->pix_desc->log2_chroma_w);
+            lines  = -(-(dst->height / 2) >> s->pix_desc->log2_chroma_h);
+        }
+
+        offset = interleaved ? dst->linesize[plane] : dst->linesize[plane] * lines;
+
+        av_image_copy_plane(dst->data[plane],
+                            dst->linesize[plane] << interleaved,
+                            s->input_views[LEFT]->data[plane],
+                            s->input_views[LEFT]->linesize[plane],
+                            length, lines);
+        av_image_copy_plane(dst->data[plane] + offset,
+                            dst->linesize[plane] << interleaved,
+                            s->input_views[RIGHT]->data[plane],
+                            s->input_views[RIGHT]->linesize[plane],
+                            length, lines);
+    }
+}
+
+static av_always_inline void spatial_frame_pack(FramepackContext *s, AVFrame *dst)
+{
+    switch (s->format) {
+    case AV_STEREO3D_SIDEBYSIDE:
+        horizontal_frame_pack(s, dst, 0);
+        break;
+    case AV_STEREO3D_COLUMNS:
+        horizontal_frame_pack(s, dst, 1);
+        break;
+    case AV_STEREO3D_TOPBOTTOM:
+        vertical_frame_pack(s, dst, 0);
+        break;
+    case AV_STEREO3D_LINES:
+        vertical_frame_pack(s, dst, 1);
+        break;
+    }
+}
+
+static int filter_frame_left(AVFilterLink *inlink, AVFrame *frame)
+{
+    FramepackContext *s = inlink->dst->priv;
+    s->input_views[LEFT] = frame;
+    return 0;
+}
+
+static int filter_frame_right(AVFilterLink *inlink, AVFrame *frame)
+{
+    FramepackContext *s = inlink->dst->priv;
+    s->input_views[RIGHT] = frame;
+    return 0;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    FramepackContext *s = ctx->priv;
+    AVStereo3D *stereo;
+    int ret, i;
+
+    /* get a frame on the either input, stop as soon as a video ends */
+    for (i = 0; i < 2; i++) {
+        if (!s->input_views[i]) {
+            ret = ff_request_frame(ctx->inputs[i]);
+            if (ret < 0)
+                return ret;
+        }
+    }
+
+    if (s->format == AV_STEREO3D_FRAMESEQUENCE) {
+        if (s->double_pts == AV_NOPTS_VALUE)
+            s->double_pts = s->input_views[LEFT]->pts;
+
+        for (i = 0; i < 2; i++) {
+            // set correct timestamps
+            s->input_views[i]->pts = s->double_pts++;
+
+            // set stereo3d side data
+            stereo = av_stereo3d_create_side_data(s->input_views[i]);
+            if (!stereo)
+                return AVERROR(ENOMEM);
+            stereo->type = s->format;
+
+            // filter the frame and immediately relinquish its pointer
+            ret = ff_filter_frame(outlink, s->input_views[i]);
+            s->input_views[i] = NULL;
+            if (ret < 0)
+                return ret;
+        }
+        return ret;
+    } else {
+        AVFrame *dst = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+        if (!dst)
+            return AVERROR(ENOMEM);
+
+        spatial_frame_pack(s, dst);
+
+        // get any property from the original frame
+        ret = av_frame_copy_props(dst, s->input_views[LEFT]);
+        if (ret < 0) {
+            av_frame_free(&dst);
+            return ret;
+        }
+
+        for (i = 0; i < 2; i++)
+            av_frame_free(&s->input_views[i]);
+
+        // set stereo3d side data
+        stereo = av_stereo3d_create_side_data(dst);
+        if (!stereo) {
+            av_frame_free(&dst);
+            return AVERROR(ENOMEM);
+        }
+        stereo->type = s->format;
+
+        return ff_filter_frame(outlink, dst);
+    }
+}
+
+#define OFFSET(x) offsetof(FramepackContext, x)
+#define V AV_OPT_FLAG_VIDEO_PARAM
+static const AVOption options[] = {
+    { "format", "Frame pack output format", OFFSET(format), AV_OPT_TYPE_INT,
+        { .i64 = AV_STEREO3D_SIDEBYSIDE }, 0, INT_MAX, .flags = V, .unit = "format" },
+    { "sbs", "Views are packed next to each other", 0, AV_OPT_TYPE_CONST,
+        { .i64 = AV_STEREO3D_SIDEBYSIDE }, INT_MIN, INT_MAX, .flags = V, .unit = "format" },
+    { "tab", "Views are packed on top of each other", 0, AV_OPT_TYPE_CONST,
+        { .i64 = AV_STEREO3D_TOPBOTTOM }, INT_MIN, INT_MAX, .flags = V, .unit = "format" },
+    { "frameseq", "Views are one after the other", 0, AV_OPT_TYPE_CONST,
+        { .i64 = AV_STEREO3D_FRAMESEQUENCE }, INT_MIN, INT_MAX, .flags = V, .unit = "format" },
+    { "lines", "Views are interleaved by lines", 0, AV_OPT_TYPE_CONST,
+        { .i64 = AV_STEREO3D_LINES }, INT_MIN, INT_MAX, .flags = V, .unit = "format" },
+    { "columns", "Views are interleaved by columns", 0, AV_OPT_TYPE_CONST,
+        { .i64 = AV_STEREO3D_COLUMNS }, INT_MIN, INT_MAX, .flags = V, .unit = "format" },
+    { NULL },
+};
+
+static const AVClass framepack_class = {
+    .class_name = "framepack",
+    .item_name  = av_default_item_name,
+    .option     = options,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVFilterPad framepack_inputs[] = {
+    {
+        .name         = "left",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame_left,
+        .needs_fifo   = 1,
+    },
+    {
+        .name         = "right",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame_right,
+        .needs_fifo   = 1,
+    },
+    { NULL }
+};
+
+static const AVFilterPad framepack_outputs[] = {
+    {
+        .name          = "packed",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .config_props  = config_output,
+        .request_frame = request_frame,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_framepack = {
+    .name          = "framepack",
+    .description   = NULL_IF_CONFIG_SMALL("Generate a frame packed stereoscopic video."),
+    .priv_size     = sizeof(FramepackContext),
+    .priv_class    = &framepack_class,
+    .query_formats = query_formats,
+    .inputs        = framepack_inputs,
+    .outputs       = framepack_outputs,
+    .uninit        = framepack_uninit,
+};