forked from guardianproject/android-ffmpeg
/
redact-plugins.patch
1102 lines (1102 loc) · 36.7 KB
/
redact-plugins.patch
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cd ~/code/eighthave/ffmpeg
git diff n0.11.1..redact-0.11.1 > ~/code/guardianproject/android-ffmpeg/redact-plugins.patch
diff --git a/ffmpeg/libavfilter/Makefile b/ffmpeg/libavfilter/Makefile
index 29345fc..9812a94 100644
--- a/ffmpeg/libavfilter/Makefile
+++ b/ffmpeg/libavfilter/Makefile
@@ -49,6 +49,7 @@ OBJS-$(CONFIG_AFORMAT_FILTER) += af_aformat.o
OBJS-$(CONFIG_AMERGE_FILTER) += af_amerge.o
OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o
OBJS-$(CONFIG_ANULL_FILTER) += af_anull.o
+OBJS-$(CONFIG_AREDACT_FILTER) += af_aredact.o
OBJS-$(CONFIG_ARESAMPLE_FILTER) += af_aresample.o
OBJS-$(CONFIG_ASHOWINFO_FILTER) += af_ashowinfo.o
OBJS-$(CONFIG_ASPLIT_FILTER) += split.o
@@ -101,6 +102,7 @@ OBJS-$(CONFIG_OCV_FILTER) += vf_libopencv.o
OBJS-$(CONFIG_OVERLAY_FILTER) += vf_overlay.o
OBJS-$(CONFIG_PAD_FILTER) += vf_pad.o
OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
+OBJS-$(CONFIG_REDACT_FILTER) += vf_redact.o
OBJS-$(CONFIG_REMOVELOGO_FILTER) += bbox.o lswsutils.o lavfutils.o vf_removelogo.o
OBJS-$(CONFIG_SELECT_FILTER) += vf_select.o
OBJS-$(CONFIG_SETDAR_FILTER) += vf_aspect.o
diff --git a/ffmpeg/libavfilter/af_aredact.c b/ffmpeg/libavfilter/af_aredact.c
new file mode 100644
index 0000000..ae77b0f
--- /dev/null
+++ b/ffmpeg/libavfilter/af_aredact.c
@@ -0,0 +1,408 @@
+/*
+ * Copyright (c) 2011 Hans-Christoph Steiner
+ * Copyright (c) 2011 Stefano Sabatini
+ *
+ * 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
+ * audio redaction filter
+ * based on af_volume.c and vf_redact.c code
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/audioconvert.h"
+#include "libavutil/eval.h"
+#include "audio.h"
+#include "avfilter.h"
+#include "formats.h"
+
+/* for lazy char* allocation */
+#define BUFLEN 1000
+
+typedef enum {redact_none,
+ redact_mute,
+ redact_noise,
+ redact_resample,
+ redact_buzzer
+} redaction_method;
+
+typedef struct {
+ double start, end;
+ redaction_method method;
+} BoxTrack;
+
+typedef struct {
+ int numtracks;
+ double time_seconds;
+ BoxTrack **boxtracks;
+} RedactionContext;
+
+static BoxTrack *box_track_from_string(const char *track_def,
+ AVFilterContext *ctx) {
+ BoxTrack *boxtrack = NULL;
+ int rv = 0;
+ char methodbuf[BUFLEN];
+ double start, end;
+
+ // Allow comments, empty lines.
+ if (track_def[0] == '#' || track_def[0] == '\0')
+ return NULL;
+
+ rv = sscanf(track_def, "%lf,%lf,%s", &start,&end,methodbuf);
+ if (rv != 3) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to parse boxtrack '%s' .\n", track_def);
+ return NULL;
+ }
+ boxtrack = (BoxTrack *)av_malloc(sizeof(BoxTrack));
+ boxtrack->start = start;
+ boxtrack->end = end;
+
+ if (av_strncasecmp(methodbuf, "mute", 4) == 0)
+ boxtrack->method = redact_mute;
+ else if (av_strncasecmp(methodbuf, "noise", 5) == 0)
+ boxtrack->method = redact_noise;
+ else if (av_strncasecmp(methodbuf, "resample", 8) == 0)
+ boxtrack->method = redact_resample;
+ else if (av_strncasecmp(methodbuf, "buzzer", 6) == 0)
+ boxtrack->method = redact_buzzer;
+ else if (av_strncasecmp(methodbuf, "none", 4) == 0)
+ boxtrack->method = redact_none;
+ else {
+ boxtrack->method = redact_mute;
+ av_log(ctx, AV_LOG_ERROR, "Unknown audio redaction method '%s', using 'mute'.\n",
+ methodbuf);
+ }
+
+ return boxtrack;
+}
+
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ RedactionContext *redaction = ctx->priv;
+ FILE *file = NULL;
+ char buf[BUFLEN];
+
+ redaction->boxtracks = NULL;
+ redaction->time_seconds = 0.0;
+ if (!args) {
+ av_log(ctx, AV_LOG_ERROR, "No arguments given to redact.\n");
+ return 1;
+ }
+ file = fopen(args, "r");
+ if (!file) {
+ av_log(ctx, AV_LOG_ERROR, "Can't open redaction file: '%s'\n", args);
+ return 2;
+ }
+ redaction->numtracks = 0;
+ // Parse the config file.
+ while (!feof(file)) {
+ BoxTrack **boxtracks = NULL;
+ BoxTrack *new_track = NULL;
+
+ if (fgets(buf, BUFLEN, file) == NULL) break; // EOF
+ new_track = box_track_from_string(buf, ctx);
+ if (new_track == NULL)
+ continue;
+ // Resize the array and add the new track.
+ boxtracks = (BoxTrack **)av_malloc((redaction->numtracks + 1) *
+ sizeof(BoxTrack *));
+ for (int i = 0; i < redaction->numtracks; ++i)
+ boxtracks[i] = redaction->boxtracks[i];
+ boxtracks[redaction->numtracks++] = new_track;
+ av_free(redaction->boxtracks);
+ redaction->boxtracks = boxtracks;
+ }
+ fclose(file);
+ // Sort the tracks so the earliest-starting are at the end of the array.
+ for (int j = 0; j < redaction->numtracks -1; ++j)
+ for (int k = j + 1; k < redaction->numtracks; ++k)
+ if (redaction->boxtracks[j]->start < redaction->boxtracks[k]->start) {
+ BoxTrack *temp = redaction->boxtracks[j];
+ redaction->boxtracks[j] = redaction->boxtracks[k];
+ redaction->boxtracks[k] = temp;
+ }
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *formats = NULL;
+ AVFilterChannelLayouts *layouts;
+ enum AVSampleFormat sample_fmts[] = {
+ AV_SAMPLE_FMT_U8,
+ AV_SAMPLE_FMT_S16,
+ AV_SAMPLE_FMT_S32,
+ AV_SAMPLE_FMT_FLT,
+ AV_SAMPLE_FMT_DBL,
+ AV_SAMPLE_FMT_NONE
+ };
+
+ layouts = ff_all_channel_layouts();
+ if (!layouts)
+ return AVERROR(ENOMEM);
+ ff_set_common_channel_layouts(ctx, layouts);
+
+ formats = avfilter_make_format_list(sample_fmts);
+ if (!formats)
+ return AVERROR(ENOMEM);
+ avfilter_set_common_sample_formats(ctx, formats);
+
+ formats = ff_all_samplerates();
+ if (!formats)
+ return AVERROR(ENOMEM);
+ ff_set_common_samplerates(ctx, formats);
+
+ return 0;
+}
+
+static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *insamples)
+{
+ RedactionContext *redaction = inlink->dst->priv;
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ const int nb_samples = insamples->audio->nb_samples *
+ av_get_channel_layout_nb_channels(insamples->audio->channel_layout);
+ int i, box;
+ BoxTrack *boxtrack;
+ redaction_method method = redact_none;
+
+ redaction->time_seconds = redaction->time_seconds +
+ (((double) nb_samples) / inlink->sample_rate);
+
+ for (box = redaction->numtracks -1; box >= 0; --box) {
+ boxtrack = redaction->boxtracks[box];
+ // Tracks are sorted by start time, so if this one starts in the future
+ // all remaining ones will.
+ if (boxtrack->start > redaction->time_seconds)
+ goto finished;
+ if (boxtrack->end < redaction->time_seconds) {
+ // Delete any tracks we've passed.
+ av_free(redaction->boxtracks[box]);
+ // Shuffle down any still-active tracks higher in the array.
+ // (We've already processed them this frame.)
+ for (int t = box + 1; t < redaction->numtracks; ++t)
+ redaction->boxtracks[t - 1] = redaction->boxtracks[t];
+ // Reduce the count.
+ redaction->boxtracks[--redaction->numtracks] = NULL;
+ } else {
+ method = boxtrack->method;
+ break; // use the first redaction time found for this timeslice
+ }
+ }
+
+ if (method != redact_none) {
+ switch (insamples->format) {
+ case AV_SAMPLE_FMT_U8:
+ {
+ uint8_t *p = (void *)insamples->data[0];
+ switch (method) {
+ case redact_mute:
+ {
+ for (i = 0; i < nb_samples; i++)
+ *p++ = 0;
+ break;
+ }
+ case redact_buzzer:
+ {
+ uint8_t state = 0;
+ for (i = 0; i < nb_samples; i++) {
+ *p++ = state / 2;
+ state = state*1664525+1013904223;
+ }
+ break;
+ }
+ case redact_resample:
+ {
+ uint8_t sample = *p;
+ int modval = inlink->sample_rate / 1500;
+ for (i = 0; i < nb_samples; i++) {
+ if (i % modval == 0)
+ sample = *p;
+ *p++ = sample;
+ }
+ break;
+ }
+ }
+ break;
+ }
+ case AV_SAMPLE_FMT_S16:
+ {
+ int16_t *p = (void *)insamples->data[0];
+ switch (method) {
+ case redact_mute:
+ {
+ for (i = 0; i < nb_samples; i++)
+ *p++ = 0;
+ break;
+ }
+ case redact_buzzer:
+ {
+ int16_t state = 0;
+ for (i = 0; i < nb_samples; i++) {
+ *p++ = state / 2;
+ state = state*1664525+1013904223;
+ }
+ break;
+ }
+ case redact_resample:
+ {
+ int16_t sample = *p;
+ int modval = inlink->sample_rate / 1500;
+ for (i = 0; i < nb_samples; i++) {
+ if (i % modval == 0)
+ sample = *p;
+ *p++ = sample;
+ }
+ break;
+ }
+ }
+ break;
+ }
+ case AV_SAMPLE_FMT_S32:
+ {
+ int32_t *p = (void *)insamples->data[0];
+ switch (method) {
+ case redact_mute:
+ {
+ for (i = 0; i < nb_samples; i++)
+ *p++ = 0;
+ break;
+ }
+ case redact_buzzer:
+ {
+ int32_t state = 0;
+ for (i = 0; i < nb_samples; i++) {
+ *p++ = state / 2;
+ state = state*1664525+1013904223;
+ }
+ break;
+ }
+ case redact_resample:
+ {
+ int32_t sample = *p;
+ int modval = inlink->sample_rate / 1500;
+ for (i = 0; i < nb_samples; i++) {
+ if (i % modval == 0)
+ sample = *p;
+ *p++ = sample;
+ }
+ break;
+ }
+ }
+ break;
+ }
+ case AV_SAMPLE_FMT_FLT:
+ {
+ float *p = (void *)insamples->data[0];
+ switch (method) {
+ case redact_mute:
+ {
+ for (i = 0; i < nb_samples; i++)
+ *p++ = 0.0;
+ break;
+ }
+ case redact_buzzer:
+ {
+ int32_t state = 0;
+ for (i = 0; i < nb_samples; i++) {
+ *p++ = (float)state / 4294967296;
+ state = state*1664525+1013904223;
+ }
+ break;
+ }
+ case redact_resample:
+ {
+ float sample = *p;
+ int modval = inlink->sample_rate / 1500;
+ for (i = 0; i < nb_samples; i++) {
+ if (i % modval == 0)
+ sample = *p;
+ *p++ = sample;
+ }
+ break;
+ }
+ }
+ break;
+ }
+ case AV_SAMPLE_FMT_DBL:
+ {
+ double *p = (void *)insamples->data[0];
+ switch (method) {
+ case redact_mute:
+ {
+ for (i = 0; i < nb_samples; i++)
+ *p++ = 0.0;
+ break;
+ }
+ case redact_buzzer:
+ {
+ int32_t state = 0;
+ for (i = 0; i < nb_samples; i++) {
+ *p++ = (double)state / 4294967296;
+ state = state*1664525+1013904223;
+ }
+ break;
+ }
+ case redact_resample:
+ {
+ double sample = *p;
+ int modval = inlink->sample_rate / 1500;
+ for (i = 0; i < nb_samples; i++) {
+ if (i % modval == 0)
+ sample = *p;
+ *p++ = sample;
+ }
+ break;
+ }
+ }
+ break;
+ }
+ }
+ }
+finished:
+ ff_filter_samples(outlink, insamples);
+}
+
+ static av_cold void uninit(AVFilterContext *ctx)
+ {
+ RedactionContext *redaction= ctx->priv;
+ for (int i = 0; i < redaction->numtracks; ++i) {
+ av_free(redaction->boxtracks[i]);
+ }
+ av_free(redaction->boxtracks);
+ }
+
+AVFilter avfilter_af_aredact = {
+ .name = "aredact",
+ .description = NULL_IF_CONFIG_SMALL("Redact the input audio according to a track file."),
+ .query_formats = query_formats,
+ .priv_size = sizeof(RedactionContext),
+ .init = init,
+ .uninit = uninit,
+
+ .inputs = (const AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_samples = filter_samples,
+ .min_perms = AV_PERM_READ|AV_PERM_WRITE},
+ { .name = NULL}},
+
+ .outputs = (const AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO, },
+ { .name = NULL}},
+};
diff --git a/ffmpeg/libavfilter/allfilters.c b/ffmpeg/libavfilter/allfilters.c
index b9d44f2..27c2346 100644
--- a/ffmpeg/libavfilter/allfilters.c
+++ b/ffmpeg/libavfilter/allfilters.c
@@ -39,6 +39,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (AMERGE, amerge, af);
REGISTER_FILTER (AMIX, amix, af);
REGISTER_FILTER (ANULL, anull, af);
+ REGISTER_FILTER (AREDACT, aredact, af);
REGISTER_FILTER (ARESAMPLE, aresample, af);
REGISTER_FILTER (ASHOWINFO, ashowinfo, af);
REGISTER_FILTER (ASPLIT, asplit, af);
@@ -91,6 +92,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (OVERLAY, overlay, vf);
REGISTER_FILTER (PAD, pad, vf);
REGISTER_FILTER (PIXDESCTEST, pixdesctest, vf);
+ REGISTER_FILTER (REDACT, redact, vf);
REGISTER_FILTER (REMOVELOGO, removelogo, vf);
REGISTER_FILTER (SELECT, select, vf);
REGISTER_FILTER (SETDAR, setdar, vf);
diff --git a/ffmpeg/libavfilter/vf_redact.c b/ffmpeg/libavfilter/vf_redact.c
new file mode 100644
index 0000000..e1e2ff5
--- /dev/null
+++ b/ffmpeg/libavfilter/vf_redact.c
@@ -0,0 +1,640 @@
+/*
+ * Copyright (c) 2011 Andrew Senior
+ *
+ * This file is for use with ffmpeg
+ * Version 0.04 - reverting to single output.
+ * No memory leak on linux. Checked with ffmpeg 0.10.4
+ */
+
+/**
+ * @file
+ * Redaction filter. Read a file describing redactions. Wipe boxes in frames
+ * accordingly.
+ */
+
+/* The redactions filename is passed as the sole parameter to the filter.
+ * The file consists of lines describing "boxtracks" which are defined
+ * by 7 comma-separated values: "%lf,%lf,%d,%d,%d,%d,%s"
+ * e.g. "0.5,1.5,50,100,0,1000,green"
+ * First: start and end times (floating point, in seconds, referenced to the
+ * presentation time stamp given by ffmpeg) and left,right, top, bottom
+ * spatial coordinates of the redaction region. (origin is top left,
+ * coordinates increase down and to right.)
+ * finally a redaction method string is given which is either "pixel" for
+ * pixellation, "inverse" for inverse pixellation (not yet implemented)
+ * "blur" for face blurring.
+ * or an ffmpeg color specifier for solid redaction.
+ * The file can contain comments, ie lines beginning with "#".
+ * Based on vf_transpose.
+ */
+
+/* Use:
+ * put this file in the libavfilter directory
+ * add the line
+ REGISTER_FILTER (REDACT, redact, vf);
+ * to avfilter_register_all in libavfilter/allfilters.c,
+ * add
+ OBJS-$(CONFIG_REDACT_FILTER) += vf_redact.o
+ * to libavfilter/Makefile, and
+ CONFIG_REDACT_FILTER=yes
+ * to config.mak
+ */
+
+
+/* todo:
+ * add noise to pixellation to make super-resolution attacks harder.
+ * a more stable-across-time pixellation appearance
+ * inverse pixellation
+ * allow the megapixel size to be specified.
+ * alternative ways to import the specification
+ * (e.g. another input port, or directly in the config string)
+ * doing face detection & tracking on the fly in the filter
+ * preserving redacted information in a separate stream
+ * allow motion specification for tracks (velocity, spline...)
+ * reference megapixels to the top left, rather than absolute grid?
+ */
+
+#include "libavutil/avstring.h"
+#include "libavutil/colorspace.h"
+#include "libavutil/lfg.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/parseutils.h"
+#include "avfilter.h"
+#include <strings.h>
+
+enum { Y, U, V, A };
+static int logging = 0;
+typedef enum {redact_solid,
+ redact_pixellate,
+ redact_inverse_pixellate,
+ redact_blur}
+ redaction_method;
+typedef struct {
+ int l, r, t, b;
+ double start, end;
+ redaction_method method;
+ unsigned char yuv_color[4]; // Used when method is redact_solid
+} BoxTrack;
+
+typedef struct {
+ int vsub, hsub; //< chroma subsampling
+ int numtracks;
+ double time_seconds;
+ BoxTrack **boxtracks;
+ AVLFG random;
+ AVFilterBufferRef *lastredacted; ///< Previous frame
+} RedactionContext;
+
+static void log_box_track(BoxTrack *bt,
+ AVFilterContext *ctx) {
+ av_log(ctx, AV_LOG_INFO, "Box track: %d: (%.1f-%.1fs) %d-%d x %d-%d\n",
+ bt->method, bt->start, bt->end,
+ bt->l, bt->r, bt->t, bt->b);
+}
+
+// memory status stuff from
+// stackoverflow.com/questions/1558402/memory-usage-of-current-process-in-c
+typedef struct {
+ unsigned long size,resident,share,text,lib,data,dt;
+} statm_t;
+
+static void read_off_memory_status(statm_t * result)
+{
+ const char* statm_path = "/proc/self/statm";
+
+ FILE *f = fopen(statm_path,"r");
+ if(!f){
+ abort();
+ }
+ if(7 != fscanf(f,"%ld %ld %ld %ld %ld %ld %ld",
+ &result->size,
+ &result->resident,
+ &result->share,
+ &result->text,
+ &result->lib,
+ &result->data,
+ &result->dt))
+ {
+ abort();
+ }
+ fclose(f);
+}
+
+static BoxTrack *box_track_from_string(const char *track_def,
+ AVFilterContext *ctx) {
+ BoxTrack *boxtrack = NULL;
+ int rv = 0;
+ int l, r, t, b;
+#define BUFLEN 1000
+ char method[BUFLEN];
+ double start, end;
+
+ // Allow comments, empty lines.
+ if (track_def[0] == '#' || track_def[0] == '\0')
+ return NULL;
+
+ rv = sscanf(track_def, "%lf,%lf,%d,%d,%d,%d,%s", &start,&end,
+ &l, &r, &t, &b, method);
+ if (rv != 7) {
+ av_log(ctx, AV_LOG_ERROR, "Failed to parse boxtrack '%s' .\n", track_def);
+ return NULL;
+ }
+ boxtrack = (BoxTrack *)av_malloc(sizeof(BoxTrack));
+ boxtrack->l = l;
+ boxtrack->r = r;
+ boxtrack->t = t;
+ boxtrack->b = b;
+ boxtrack->start = start;
+ boxtrack->end = end;
+ boxtrack->method = redact_pixellate;
+
+ // todo: allow the granularity of the pixellation to be specified.
+ if (av_strncasecmp(method, "pixel", 5) == 0)
+ boxtrack->method = redact_pixellate;
+ else if (av_strncasecmp(method, "inv", 3) == 0)
+ boxtrack->method = redact_inverse_pixellate;
+ else if (av_strncasecmp(method, "blur", 4) == 0)
+ boxtrack->method = redact_blur;
+ else {
+ uint8_t rgba_color[4];
+
+ boxtrack->method = redact_solid;
+
+ if (av_parse_color(rgba_color, method, -1, ctx) < 0)
+ av_log(ctx, AV_LOG_ERROR, "Couldn't parse colour '%s' .\n", method);
+
+ boxtrack->yuv_color[Y] =
+ RGB_TO_Y_CCIR(rgba_color[0], rgba_color[1], rgba_color[2]);
+ boxtrack->yuv_color[U] =
+ RGB_TO_U_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
+ boxtrack->yuv_color[V] =
+ RGB_TO_V_CCIR(rgba_color[0], rgba_color[1], rgba_color[2], 0);
+ boxtrack->yuv_color[A] = rgba_color[3];
+ }
+ return boxtrack;
+}
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ RedactionContext *redaction= ctx->priv;
+ FILE *file = NULL;
+ char buf[BUFLEN];
+ unsigned int seed=298379;
+ redaction->boxtracks = NULL;
+ redaction->lastredacted = NULL;
+ redaction->time_seconds = NAN;
+ if (!args) {
+ av_log(ctx, AV_LOG_ERROR, "No arguments given to redact.\n");
+ return 1;
+ }
+ file = fopen(args, "r");
+ if (!file) {
+ av_log(ctx, AV_LOG_ERROR, "Can't open redaction file: '%s'\n", args);
+ return 2;
+ }
+ redaction->numtracks = 0;
+ // Parse the config file.
+ while (!feof(file)) {
+ BoxTrack **boxtracks = NULL;
+ BoxTrack *new_track = NULL;
+
+ if (fgets(buf, BUFLEN, file) == NULL) break; // EOF
+ if (strncmp(buf, "seed", 4) == 0) {
+ int rv = sscanf(buf, "seed %ud", &seed);
+ if (rv != 1)
+ av_log(ctx, AV_LOG_ERROR, "Didn't parse seed: %s.\n", buf);
+
+ continue;
+ }
+ new_track = box_track_from_string(buf, ctx);
+ if (new_track == NULL)
+ continue;
+ log_box_track(new_track, ctx);
+ // Resize the array and add the new track.
+ boxtracks = (BoxTrack **)av_malloc((redaction->numtracks + 1) *
+ sizeof(BoxTrack *));
+ for (int i = 0; i < redaction->numtracks; ++i)
+ boxtracks[i] = redaction->boxtracks[i];
+ boxtracks[redaction->numtracks++] = new_track;
+ av_free(redaction->boxtracks);
+ redaction->boxtracks = boxtracks;
+ }
+ av_log(ctx, AV_LOG_INFO, "Seed is : '%ud'\n", seed);
+ av_lfg_init(&redaction->random, seed);
+ fclose(file);
+ // Sort the tracks so the earliest-starting are at the end of the array.
+ for (int j = 0; j < redaction->numtracks -1; ++j)
+ for (int k = j + 1; k < redaction->numtracks; ++k)
+ if (redaction->boxtracks[j]->start < redaction->boxtracks[k]->start) {
+ BoxTrack *temp = redaction->boxtracks[j];
+ redaction->boxtracks[j] = redaction->boxtracks[k];
+ redaction->boxtracks[k] = temp;
+ }
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ enum PixelFormat pix_fmts[] = {
+ PIX_FMT_YUV444P, PIX_FMT_YUV422P, PIX_FMT_YUV420P,
+ PIX_FMT_YUV411P, PIX_FMT_YUV410P,
+ PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
+ PIX_FMT_YUV440P, PIX_FMT_YUVJ440P,
+ PIX_FMT_NONE
+ };
+
+ avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts));
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ RedactionContext *redaction = inlink->dst->priv;
+
+ redaction->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
+ redaction->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;
+
+ av_log(inlink->dst, AV_LOG_INFO, "Redaction with %d tracks %d %d\n",
+ redaction->numtracks, redaction->hsub, redaction->vsub);
+
+ return 0;
+}
+
+// Decode the timestamp.
+static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+{
+ AVFilterContext *ctx = inlink->dst;
+ RedactionContext *redaction = inlink->dst->priv;
+ AVFilterLink *outlink0 = inlink->dst->outputs[0];
+
+ redaction->time_seconds = picref->pts * av_q2d(inlink->time_base);
+ outlink0->out_buf = avfilter_get_video_buffer(outlink0, AV_PERM_WRITE,
+ outlink0->w, outlink0->h);
+ outlink0->out_buf->pts = picref->pts;
+ avfilter_start_frame(outlink0,
+ avfilter_ref_buffer(outlink0->out_buf, ~0));
+}
+
+static int noise = 10;
+static void convolve_ny(int t, int b, int maxy,
+ unsigned char *row, int blur, unsigned char *blurbuf,
+ int step,
+ AVLFG *random) {
+ int halfblur = blur/2;
+ int blursum = 0;
+ int i;
+ for (i = 0; i < blur; ++i) {
+ int pos = t + i - halfblur;
+ blurbuf[i] = (pos <= 0) ? row[0] : row[pos * step];
+ blursum += blurbuf[i];
+ }
+ for (int y = t; y < b; ++y, ++i) {
+ int newval = blursum / blur;
+ int newpos = y + (blur + 1)/2;
+ i %= blur;
+ if (noise > 0) {
+ newval += (av_lfg_get(random) % (2 * noise + 1)) - noise;
+ if (newval < 0 ) newval = 0;
+ else if (newval > 255) newval = 255;
+ }
+ row[y*step] = newval;
+ blursum -= blurbuf[i];
+ blurbuf[i] = row[step * ((newpos < maxy) ? newpos : (maxy - 1))];
+ blursum += blurbuf[i];
+ }
+}
+// Keep a rolling buffer of n values and their sum.
+// Store the average in the output vector and update the sum by dropping one
+// value and inserting another.
+static void convolve_nx(int l, int r, int maxx,
+ unsigned char *row, int blur, unsigned char *blurbuf,
+ AVLFG *random) {
+ int halfblur = blur/2;
+ int blursum = 0;
+ int i;
+ for (i = 0; i < blur; ++i) {
+ int pos = l + i - halfblur;
+ blurbuf[i] = (pos <= 0) ? row[0] : row[pos];
+ blursum += blurbuf[i];
+ }
+ for (int x = l; x < r; ++x, ++i) {
+ int newval = blursum / blur;
+ int newpos = x + (blur + 1)/2;
+ i %= blur;
+ if (noise > 0) {
+ newval += (av_lfg_get(random) % (2 * noise + 1)) - noise;
+ if (newval < 0 ) newval = 0;
+ else if (newval > 255) newval = 255;
+ }
+ row[x] = newval;
+ blursum -= blurbuf[i];
+ blurbuf[i] = row[(newpos < maxx) ? newpos : (maxx - 1)];
+ blursum += blurbuf[i];
+ }
+}
+
+static void blur_one_round(AVFilterBufferRef *picref, BoxTrack *boxtrack,
+ int y0, int h, int hsub, int vsub,
+ int blur, unsigned char *blurbuf,
+ AVLFG *random) {
+ int xb = boxtrack->l, yb = boxtrack->t;
+ int hb = boxtrack->b - boxtrack->t;
+ int wb = boxtrack->r - boxtrack->l;
+ int x, y;
+ int xmax, ymax;
+
+#define BLURX
+#define BLURY
+#ifdef BLURX
+ x = FFMAX(xb, 0);
+ blur = wb/2;
+ xmax = FFMIN( (xb + wb), picref->video->w);
+ for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + hb); ++y) {
+ for (int plane = 0; plane < 3; plane++) {
+ int ds = (plane == 0) ? 0 : hsub;
+ unsigned char *row = picref->data[plane] +
+ picref->linesize[plane] * (y >> ((plane == 0) ? 0 : vsub));
+ convolve_nx(x >> ds, (xmax + ((1<<ds) -1))>> ds, picref->video->w >> ds,
+ row,
+ (blur + ((1<<ds) -1))>> ds, blurbuf, random);
+ }
+ }
+#endif
+#ifdef BLURY
+ y = FFMAX(yb, y0);
+ ymax = FFMIN( (yb + hb), (y0 + h));
+ blur = hb/2;
+ for (x = FFMAX(xb, 0); x < (xb + wb) && x < picref->video->w; x++) {
+ for (int plane = 0; plane < 3; plane++) {
+ int ds = (plane == 0) ? 0 : vsub;
+ unsigned char *col = picref->data[plane] + (x >> ((plane == 0) ? 0 : hsub));
+ convolve_ny(y >> ds, (ymax + ((1<<ds) -1)) >> ds,
+ (y0 + h) >> ds,
+ col, (blur + ((1<<ds) -1))>> ds, blurbuf,
+ picref->linesize[plane], random);
+ }
+ }
+#endif
+}
+
+static void copybox_mixold_alpha(AVFilterBufferRef *source,
+ AVFilterBufferRef *picref,
+ AVFilterBufferRef *lastref,
+ BoxTrack *boxtrack,
+ int hsub, int vsub,
+ AVLFG *random) {
+ int xb = boxtrack->l;
+ int yb = boxtrack->t;
+ int hb = boxtrack->b - boxtrack->t;
+ int wb = boxtrack->r - boxtrack->l;
+
+ float blur_boundary = 0.2;
+ for (int y = FFMAX(yb, 0); y < picref->video->h && y < boxtrack->b; y++) {
+ float ynormsq = (y * 2.0 - (boxtrack->b + boxtrack->t)) / hb;
+ ynormsq *= ynormsq;
+ for (int plane = 0; plane < 3; plane++) {
+ int ysub = (y >> ((plane == 0) ? 0 : vsub));
+ unsigned char *row = picref->data[plane] +
+ picref->linesize[plane] * ysub;
+ unsigned char *srcrow = source->data[plane] +
+ picref->linesize[plane] * ysub;
+ unsigned char *lastrow = lastref->data[plane] +
+ picref->linesize[plane] * ysub;
+
+ int thishsub = (plane == 0) ? 0 : hsub;
+ int xmin = FFMAX(xb, 0) >> thishsub;
+ int xmax = FFMIN(boxtrack->r, picref->video->w)
+ >> thishsub;
+ for (int x = xmin; x < xmax; x++) {
+ // TODO: do the alphablending in int.
+ // TODO: allow a flag for alpha blending or not.
+ float xnorm = ((x << thishsub) * 2.0 - (boxtrack->l + boxtrack->r))
+ / wb;
+ float mixlast = ((av_lfg_get(random) % 20) + 10) / 40.0;
+ float alphax = (1 - sqrt(xnorm * xnorm + ynormsq));
+ if (alphax < 0) {
+ row[x] = srcrow[x];
+ continue;
+ }
+ if (alphax > blur_boundary)
+ alphax = 1;
+ else
+ alphax /= blur_boundary;
+ row[x] = (1 - alphax) * srcrow[x] +
+ alphax * ((1 - mixlast) * row[x] + mixlast * lastrow[x]);
+ }
+ }
+ }
+}
+
+// In a picture carry out the obscuration of boxtrack.
+static void obscure_one_box(AVFilterBufferRef *source,
+ AVFilterBufferRef *picref,
+ AVFilterBufferRef *lastref,
+ BoxTrack *boxtrack,
+ int y0, int h, int hsub, int vsub,
+ AVLFG *random) {
+ unsigned char *row[4];
+ int xb = boxtrack->l, yb = boxtrack->t;
+ int hb = boxtrack->b - boxtrack->t;
+ int wb = boxtrack->r - boxtrack->l;
+ int megapixel_size = 64; // todo: get from file
+ int x, y;
+ if (boxtrack->method == redact_blur) {
+ const int blur = FFMAX(hb, wb);
+ unsigned char *blurbuf = (unsigned char *)av_malloc(blur);
+ blur_one_round(picref, boxtrack, y0, h, hsub, vsub, blur, blurbuf, random);
+ copybox_mixold_alpha(source, picref,
+ ((lastref==NULL)?source:lastref),
+ boxtrack, hsub, vsub, random);
+ av_free(blurbuf);
+ return;
+ }
+
+ for (y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + hb); y++) {
+ row[0] = picref->data[0] + y * picref->linesize[0];
+
+ for (int plane = 1; plane < 3; plane++)
+ row[plane] = picref->data[plane] +
+ picref->linesize[plane] * (y >> vsub);
+
+ for (x = FFMAX(xb, 0); x < (xb + wb) && x < picref->video->w; x++) {
+ double alpha = (double)boxtrack->yuv_color[A] / 255;
+ if (boxtrack->method == redact_solid) {
+ row[0][x] = (1 - alpha) * row[0][x] +
+ alpha * boxtrack->yuv_color[Y];
+ // todo: if hsub is non-zero this will do the same pixel mutliple times.
+ // which is wasteful. Wrong if alpha is != 1
+ row[1][x >> hsub] = (1 - alpha) * row[1][x >> hsub] +
+ alpha * boxtrack->yuv_color[U];
+ row[2][x >> hsub] = (1 - alpha) * row[2][x >> hsub] +
+ alpha * boxtrack->yuv_color[V];
+ } else if (boxtrack->method == redact_pixellate) {
+ int x_quant = (x / megapixel_size) * megapixel_size;
+ int y_quant = (y / megapixel_size) * megapixel_size;
+ row[0][x] = (picref->data[0] + y_quant *
+ picref->linesize[0])[x_quant];
+ row[1][x >> hsub] = (picref->data[1] + picref->linesize[1] *
+ (y_quant >> vsub))[x_quant >> hsub];
+ row[2][x >> hsub] = (picref->data[2] + picref->linesize[2] *
+ (y_quant >> vsub))[x_quant >> hsub];
+ }
+ }
+ }
+}
+
+// Set all elements of planes 0,1,2 to val: 128=grey 0=green
+static void erase_output2(AVFilterBufferRef *outpic,
+ int y0, int h, int hsub, int vsub,
+ unsigned char val) {
+ unsigned char v[] = { 16, 128, 128};
+ for (int y = y0; y < (y0 + h); y++) {
+ for (int plane = 0; plane < 3; plane++) {
+ uint8_t *outrow = outpic->data[plane] +
+ outpic->linesize[plane] * (y >> ((plane == 0)?0:vsub));
+ const int xmax = outpic->video->w >> ((plane == 0)?0:hsub);
+ memset(outrow, v[plane], xmax);
+ } // plane
+ } // y
+}
+
+// Copy all the image data from picref to outpic.
+static void copy_all(AVFilterBufferRef *picref,
+ AVFilterBufferRef *outpic,
+ int hsub, int vsub) {
+ for (int y = 0; y < picref->video->h; y++) {
+ for (int plane = 0; plane < 3; plane++) {
+ uint8_t *row = picref->data[plane] +
+ picref->linesize[plane] * (y >> ((plane == 0)?0:vsub));
+ uint8_t *outrow = outpic->data[plane] +
+ outpic->linesize[plane] * (y >> ((plane == 0)?0:vsub));
+ int xwid = picref->video->w >> ((plane == 0)?0:hsub);
+ memcpy(outrow, row, xwid);
+ } // plane
+ } // y
+}
+
+// Copy one box from the input to the output.
+static void copy_one_box(AVFilterBufferRef *picref,
+ AVFilterBufferRef *outpic,
+ BoxTrack *boxtrack,
+ int y0, int h, int hsub, int vsub) {
+ int xb = boxtrack->l;
+ int yb = boxtrack->t;
+ int hb = boxtrack->b - boxtrack->t;
+ int wb = boxtrack->r - boxtrack->l;
+
+ for (int y = FFMAX(yb, y0); y < (y0 + h) && y < (yb + hb); y++) {
+ for (int plane = 0; plane < 3; plane++) {
+ uint8_t *row = picref->data[plane] +
+ picref->linesize[plane] * (y >> ((plane == 0)?0:vsub));
+ uint8_t *outrow = outpic->data[plane] +
+ outpic->linesize[plane] * (y >> ((plane == 0)?0:vsub));
+ int xmin = FFMAX(xb, 0) >> ((plane == 0)?0:hsub);
+ int xmax = FFMIN((xb + wb), picref->video->w)
+ >> ((plane == 0)?0:hsub);
+ memcpy(outrow + xmin, row + xmin, xmax - xmin);
+ } // plane