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vf_signature.c
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/*
* Copyright (c) 2017 Gerion Entrup
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU 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
* MPEG-7 video signature calculation and lookup filter
* @see http://epubs.surrey.ac.uk/531590/1/MPEG-7%20Video%20Signature%20Author%27s%20Copy.pdf
*/
#include "libavcodec/put_bits.h"
#include "libavformat/avformat.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/avstring.h"
#include "libavutil/file_open.h"
#include "avfilter.h"
#include "filters.h"
#include "signature.h"
#include "signature_lookup.c"
#define OFFSET(x) offsetof(SignatureContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM
#define BLOCK_LCM (int64_t) 476985600
static const AVOption signature_options[] = {
{ "detectmode", "set the detectmode",
OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_OFF}, 0, NB_LOOKUP_MODE-1, FLAGS, .unit = "mode" },
{ "off", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_OFF}, 0, 0, .flags = FLAGS, .unit = "mode" },
{ "full", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_FULL}, 0, 0, .flags = FLAGS, .unit = "mode" },
{ "fast", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = MODE_FAST}, 0, 0, .flags = FLAGS, .unit = "mode" },
{ "nb_inputs", "number of inputs",
OFFSET(nb_inputs), AV_OPT_TYPE_INT, {.i64 = 1}, 1, INT_MAX, FLAGS },
{ "filename", "filename for output files",
OFFSET(filename), AV_OPT_TYPE_STRING, {.str = ""}, 0, NB_FORMATS-1, FLAGS },
{ "format", "set output format",
OFFSET(format), AV_OPT_TYPE_INT, {.i64 = FORMAT_BINARY}, 0, 1, FLAGS , .unit = "format" },
{ "binary", 0, 0, AV_OPT_TYPE_CONST, {.i64=FORMAT_BINARY}, 0, 0, FLAGS, .unit = "format" },
{ "xml", 0, 0, AV_OPT_TYPE_CONST, {.i64=FORMAT_XML}, 0, 0, FLAGS, .unit = "format" },
{ "th_d", "threshold to detect one word as similar",
OFFSET(thworddist), AV_OPT_TYPE_INT, {.i64 = 9000}, 1, INT_MAX, FLAGS },
{ "th_dc", "threshold to detect all words as similar",
OFFSET(thcomposdist), AV_OPT_TYPE_INT, {.i64 = 60000}, 1, INT_MAX, FLAGS },
{ "th_xh", "threshold to detect frames as similar",
OFFSET(thl1), AV_OPT_TYPE_INT, {.i64 = 116}, 1, INT_MAX, FLAGS },
{ "th_di", "minimum length of matching sequence in frames",
OFFSET(thdi), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS },
{ "th_it", "threshold for relation of good to all frames",
OFFSET(thit), AV_OPT_TYPE_DOUBLE, {.dbl = 0.5}, 0.0, 1.0, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(signature);
/* all formats with a separate gray value */
static const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_GRAY8,
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P,
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
AV_PIX_FMT_YUVJ440P,
AV_PIX_FMT_NV12, AV_PIX_FMT_NV21,
AV_PIX_FMT_NONE
};
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
SignatureContext *sic = ctx->priv;
StreamContext *sc = &(sic->streamcontexts[FF_INLINK_IDX(inlink)]);
sc->time_base = inlink->time_base;
/* test for overflow */
sc->divide = (((uint64_t) inlink->w/32) * (inlink->w/32 + 1) * (inlink->h/32 * inlink->h/32 + 1) > INT64_MAX / (BLOCK_LCM * 255));
if (sc->divide) {
av_log(ctx, AV_LOG_WARNING, "Input dimension too high for precise calculation, numbers will be rounded.\n");
}
sc->w = inlink->w;
sc->h = inlink->h;
return 0;
}
static int get_block_size(const Block *b)
{
return (b->to.y - b->up.y + 1) * (b->to.x - b->up.x + 1);
}
static uint64_t get_block_sum(StreamContext *sc, uint64_t intpic[32][32], const Block *b)
{
uint64_t sum = 0;
int x0, y0, x1, y1;
x0 = b->up.x;
y0 = b->up.y;
x1 = b->to.x;
y1 = b->to.y;
if (x0-1 >= 0 && y0-1 >= 0) {
sum = intpic[y1][x1] + intpic[y0-1][x0-1] - intpic[y1][x0-1] - intpic[y0-1][x1];
} else if (x0-1 >= 0) {
sum = intpic[y1][x1] - intpic[y1][x0-1];
} else if (y0-1 >= 0) {
sum = intpic[y1][x1] - intpic[y0-1][x1];
} else {
sum = intpic[y1][x1];
}
return sum;
}
static int cmp(const void *x, const void *y)
{
const uint64_t *a = x, *b = y;
return *a < *b ? -1 : ( *a > *b ? 1 : 0 );
}
/**
* sets the bit at position pos to 1 in data
*/
static void set_bit(uint8_t* data, size_t pos)
{
uint8_t mask = 1 << 7-(pos%8);
data[pos/8] |= mask;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
{
AVFilterContext *ctx = inlink->dst;
SignatureContext *sic = ctx->priv;
StreamContext *sc = &(sic->streamcontexts[FF_INLINK_IDX(inlink)]);
FineSignature* fs;
static const uint8_t pot3[5] = { 3*3*3*3, 3*3*3, 3*3, 3, 1 };
/* indexes of words : 210,217,219,274,334 44,175,233,270,273 57,70,103,237,269 100,285,295,337,354 101,102,111,275,296
s2usw = sorted to unsorted wordvec: 44 is at index 5, 57 at index 10...
*/
static const unsigned int wordvec[25] = {44,57,70,100,101,102,103,111,175,210,217,219,233,237,269,270,273,274,275,285,295,296,334,337,354};
static const uint8_t s2usw[25] = { 5,10,11, 15, 20, 21, 12, 22, 6, 0, 1, 2, 7, 13, 14, 8, 9, 3, 23, 16, 17, 24, 4, 18, 19};
uint8_t wordt2b[5] = { 0, 0, 0, 0, 0 }; /* word ternary to binary */
uint64_t intpic[32][32];
uint64_t rowcount;
uint8_t *p = picref->data[0];
int inti, intj;
int *intjlut;
uint64_t conflist[DIFFELEM_SIZE];
int f = 0, g = 0, w = 0;
int32_t dh1 = 1, dh2 = 1, dw1 = 1, dw2 = 1, a, b;
int64_t denom;
int i, j, k, ternary;
uint64_t blocksum;
int blocksize;
int64_t th; /* threshold */
int64_t sum;
int64_t precfactor = (sc->divide) ? 65536 : BLOCK_LCM;
/* initialize fs */
if (sc->curfinesig) {
fs = av_mallocz(sizeof(FineSignature));
if (!fs)
return AVERROR(ENOMEM);
sc->curfinesig->next = fs;
fs->prev = sc->curfinesig;
sc->curfinesig = fs;
} else {
fs = sc->curfinesig = sc->finesiglist;
sc->curcoarsesig1->first = fs;
}
fs->pts = picref->pts;
fs->index = sc->lastindex++;
memset(intpic, 0, sizeof(uint64_t)*32*32);
intjlut = av_malloc_array(inlink->w, sizeof(int));
if (!intjlut)
return AVERROR(ENOMEM);
for (i = 0; i < inlink->w; i++) {
intjlut[i] = (i*32)/inlink->w;
}
for (i = 0; i < inlink->h; i++) {
inti = (i*32)/inlink->h;
for (j = 0; j < inlink->w; j++) {
intj = intjlut[j];
intpic[inti][intj] += p[j];
}
p += picref->linesize[0];
}
av_freep(&intjlut);
/* The following calculates a summed area table (intpic) and brings the numbers
* in intpic to the same denominator.
* So you only have to handle the numinator in the following sections.
*/
dh1 = inlink->h / 32;
if (inlink->h % 32)
dh2 = dh1 + 1;
dw1 = inlink->w / 32;
if (inlink->w % 32)
dw2 = dw1 + 1;
denom = (sc->divide) ? dh1 * (int64_t)dh2 * dw1 * dw2 : 1;
for (i = 0; i < 32; i++) {
rowcount = 0;
a = 1;
if (dh2 > 1) {
a = ((inlink->h*(i+1))%32 == 0) ? (inlink->h*(i+1))/32 - 1 : (inlink->h*(i+1))/32;
a -= ((inlink->h*i)%32 == 0) ? (inlink->h*i)/32 - 1 : (inlink->h*i)/32;
a = (a == dh1)? dh2 : dh1;
}
for (j = 0; j < 32; j++) {
b = 1;
if (dw2 > 1) {
b = ((inlink->w*(j+1))%32 == 0) ? (inlink->w*(j+1))/32 - 1 : (inlink->w*(j+1))/32;
b -= ((inlink->w*j)%32 == 0) ? (inlink->w*j)/32 - 1 : (inlink->w*j)/32;
b = (b == dw1)? dw2 : dw1;
}
rowcount += intpic[i][j] * a * b * precfactor / denom;
if (i > 0) {
intpic[i][j] = intpic[i-1][j] + rowcount;
} else {
intpic[i][j] = rowcount;
}
}
}
denom = (sc->divide) ? 1 : dh1 * (int64_t)dh2 * dw1 * dw2;
for (i = 0; i < ELEMENT_COUNT; i++) {
const ElemCat* elemcat = elements[i];
int64_t* elemsignature;
uint64_t* sortsignature;
elemsignature = av_malloc_array(elemcat->elem_count, 2 * sizeof(int64_t));
if (!elemsignature)
return AVERROR(ENOMEM);
sortsignature = elemsignature + elemcat->elem_count;
for (j = 0; j < elemcat->elem_count; j++) {
blocksum = 0;
blocksize = 0;
for (k = 0; k < elemcat->left_count; k++) {
blocksum += get_block_sum(sc, intpic, &elemcat->blocks[j*elemcat->block_count+k]);
blocksize += get_block_size(&elemcat->blocks[j*elemcat->block_count+k]);
}
sum = blocksum / blocksize;
if (elemcat->av_elem) {
sum -= 128 * precfactor * denom;
} else {
blocksum = 0;
blocksize = 0;
for (; k < elemcat->block_count; k++) {
blocksum += get_block_sum(sc, intpic, &elemcat->blocks[j*elemcat->block_count+k]);
blocksize += get_block_size(&elemcat->blocks[j*elemcat->block_count+k]);
}
sum -= blocksum / blocksize;
conflist[g++] = FFABS(sum * 8 / (precfactor * denom));
}
elemsignature[j] = sum;
sortsignature[j] = FFABS(sum);
}
/* get threshold */
qsort(sortsignature, elemcat->elem_count, sizeof(uint64_t), cmp);
th = sortsignature[(int) (elemcat->elem_count*0.333)];
/* ternarize */
for (j = 0; j < elemcat->elem_count; j++) {
if (elemsignature[j] < -th) {
ternary = 0;
} else if (elemsignature[j] <= th) {
ternary = 1;
} else {
ternary = 2;
}
fs->framesig[f/5] += ternary * pot3[f%5];
if (f == wordvec[w]) {
fs->words[s2usw[w]/5] += ternary * pot3[wordt2b[s2usw[w]/5]++];
if (w < 24)
w++;
}
f++;
}
av_freep(&elemsignature);
}
/* confidence */
qsort(conflist, DIFFELEM_SIZE, sizeof(uint64_t), cmp);
fs->confidence = FFMIN(conflist[DIFFELEM_SIZE/2], 255);
/* coarsesignature */
if (sc->coarsecount == 0) {
if (sc->curcoarsesig2) {
sc->curcoarsesig1 = av_mallocz(sizeof(CoarseSignature));
if (!sc->curcoarsesig1)
return AVERROR(ENOMEM);
sc->curcoarsesig1->first = fs;
sc->curcoarsesig2->next = sc->curcoarsesig1;
sc->coarseend = sc->curcoarsesig1;
}
}
if (sc->coarsecount == 45) {
sc->midcoarse = 1;
sc->curcoarsesig2 = av_mallocz(sizeof(CoarseSignature));
if (!sc->curcoarsesig2)
return AVERROR(ENOMEM);
sc->curcoarsesig2->first = fs;
sc->curcoarsesig1->next = sc->curcoarsesig2;
sc->coarseend = sc->curcoarsesig2;
}
for (i = 0; i < 5; i++) {
set_bit(sc->curcoarsesig1->data[i], fs->words[i]);
}
/* assuming the actual frame is the last */
sc->curcoarsesig1->last = fs;
if (sc->midcoarse) {
for (i = 0; i < 5; i++) {
set_bit(sc->curcoarsesig2->data[i], fs->words[i]);
}
sc->curcoarsesig2->last = fs;
}
sc->coarsecount = (sc->coarsecount+1)%90;
/* debug printing finesignature */
if (av_log_get_level() == AV_LOG_DEBUG) {
av_log(ctx, AV_LOG_DEBUG, "input %d, confidence: %d\n", FF_INLINK_IDX(inlink), fs->confidence);
av_log(ctx, AV_LOG_DEBUG, "words:");
for (i = 0; i < 5; i++) {
av_log(ctx, AV_LOG_DEBUG, " %d:", fs->words[i] );
av_log(ctx, AV_LOG_DEBUG, " %d", fs->words[i] / pot3[0] );
for (j = 1; j < 5; j++)
av_log(ctx, AV_LOG_DEBUG, ",%d", fs->words[i] % pot3[j-1] / pot3[j] );
av_log(ctx, AV_LOG_DEBUG, ";");
}
av_log(ctx, AV_LOG_DEBUG, "\n");
av_log(ctx, AV_LOG_DEBUG, "framesignature:");
for (i = 0; i < SIGELEM_SIZE/5; i++) {
av_log(ctx, AV_LOG_DEBUG, " %d", fs->framesig[i] / pot3[0] );
for (j = 1; j < 5; j++)
av_log(ctx, AV_LOG_DEBUG, ",%d", fs->framesig[i] % pot3[j-1] / pot3[j] );
}
av_log(ctx, AV_LOG_DEBUG, "\n");
}
if (FF_INLINK_IDX(inlink) == 0)
return ff_filter_frame(inlink->dst->outputs[0], picref);
return 1;
}
static int xml_export(AVFilterContext *ctx, StreamContext *sc, const char* filename)
{
FineSignature* fs;
CoarseSignature* cs;
int i, j;
FILE* f;
unsigned int pot3[5] = { 3*3*3*3, 3*3*3, 3*3, 3, 1 };
if (!sc->coarseend->last)
return AVERROR(EINVAL); // No frames ?
f = avpriv_fopen_utf8(filename, "w");
if (!f) {
int err = AVERROR(EINVAL);
av_log(ctx, AV_LOG_ERROR, "cannot open xml file %s: %s\n", filename, av_err2str(err));
return err;
}
/* header */
fprintf(f, "<?xml version='1.0' encoding='ASCII' ?>\n");
fprintf(f, "<Mpeg7 xmlns=\"urn:mpeg:mpeg7:schema:2001\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"urn:mpeg:mpeg7:schema:2001 schema/Mpeg7-2001.xsd\">\n");
fprintf(f, " <DescriptionUnit xsi:type=\"DescriptorCollectionType\">\n");
fprintf(f, " <Descriptor xsi:type=\"VideoSignatureType\">\n");
fprintf(f, " <VideoSignatureRegion>\n");
fprintf(f, " <VideoSignatureSpatialRegion>\n");
fprintf(f, " <Pixel>0 0 </Pixel>\n");
fprintf(f, " <Pixel>%d %d </Pixel>\n", sc->w - 1, sc->h - 1);
fprintf(f, " </VideoSignatureSpatialRegion>\n");
fprintf(f, " <StartFrameOfSpatialRegion>0</StartFrameOfSpatialRegion>\n");
/* hoping num is 1, other values are vague */
fprintf(f, " <MediaTimeUnit>%d</MediaTimeUnit>\n", sc->time_base.den / sc->time_base.num);
fprintf(f, " <MediaTimeOfSpatialRegion>\n");
fprintf(f, " <StartMediaTimeOfSpatialRegion>0</StartMediaTimeOfSpatialRegion>\n");
fprintf(f, " <EndMediaTimeOfSpatialRegion>%" PRIu64 "</EndMediaTimeOfSpatialRegion>\n", sc->coarseend->last->pts);
fprintf(f, " </MediaTimeOfSpatialRegion>\n");
/* coarsesignatures */
for (cs = sc->coarsesiglist; cs; cs = cs->next) {
fprintf(f, " <VSVideoSegment>\n");
fprintf(f, " <StartFrameOfSegment>%" PRIu32 "</StartFrameOfSegment>\n", cs->first->index);
fprintf(f, " <EndFrameOfSegment>%" PRIu32 "</EndFrameOfSegment>\n", cs->last->index);
fprintf(f, " <MediaTimeOfSegment>\n");
fprintf(f, " <StartMediaTimeOfSegment>%" PRIu64 "</StartMediaTimeOfSegment>\n", cs->first->pts);
fprintf(f, " <EndMediaTimeOfSegment>%" PRIu64 "</EndMediaTimeOfSegment>\n", cs->last->pts);
fprintf(f, " </MediaTimeOfSegment>\n");
for (i = 0; i < 5; i++) {
fprintf(f, " <BagOfWords>");
for (j = 0; j < 31; j++) {
uint8_t n = cs->data[i][j];
if (j < 30) {
fprintf(f, "%d %d %d %d %d %d %d %d ", (n & 0x80) >> 7,
(n & 0x40) >> 6,
(n & 0x20) >> 5,
(n & 0x10) >> 4,
(n & 0x08) >> 3,
(n & 0x04) >> 2,
(n & 0x02) >> 1,
(n & 0x01));
} else {
/* print only 3 bit in last byte */
fprintf(f, "%d %d %d ", (n & 0x80) >> 7,
(n & 0x40) >> 6,
(n & 0x20) >> 5);
}
}
fprintf(f, "</BagOfWords>\n");
}
fprintf(f, " </VSVideoSegment>\n");
}
/* finesignatures */
for (fs = sc->finesiglist; fs; fs = fs->next) {
fprintf(f, " <VideoFrame>\n");
fprintf(f, " <MediaTimeOfFrame>%" PRIu64 "</MediaTimeOfFrame>\n", fs->pts);
/* confidence */
fprintf(f, " <FrameConfidence>%d</FrameConfidence>\n", fs->confidence);
/* words */
fprintf(f, " <Word>");
for (i = 0; i < 5; i++) {
fprintf(f, "%d ", fs->words[i]);
if (i < 4) {
fprintf(f, " ");
}
}
fprintf(f, "</Word>\n");
/* framesignature */
fprintf(f, " <FrameSignature>");
for (i = 0; i< SIGELEM_SIZE/5; i++) {
if (i > 0) {
fprintf(f, " ");
}
fprintf(f, "%d ", fs->framesig[i] / pot3[0]);
for (j = 1; j < 5; j++)
fprintf(f, " %d ", fs->framesig[i] % pot3[j-1] / pot3[j] );
}
fprintf(f, "</FrameSignature>\n");
fprintf(f, " </VideoFrame>\n");
}
fprintf(f, " </VideoSignatureRegion>\n");
fprintf(f, " </Descriptor>\n");
fprintf(f, " </DescriptionUnit>\n");
fprintf(f, "</Mpeg7>\n");
fclose(f);
return 0;
}
static int binary_export(AVFilterContext *ctx, StreamContext *sc, const char* filename)
{
FILE* f;
FineSignature* fs;
CoarseSignature* cs;
uint32_t numofsegments = (sc->lastindex + 44)/45;
int i, j;
PutBitContext buf;
/* buffer + header + coarsesignatures + finesignature */
int len = (512 + 6 * 32 + 3*16 + 2 +
numofsegments * (4*32 + 1 + 5*243) +
sc->lastindex * (2 + 32 + 6*8 + 608)) / 8;
uint8_t* buffer = av_malloc_array(len, sizeof(uint8_t));
if (!buffer)
return AVERROR(ENOMEM);
f = avpriv_fopen_utf8(filename, "wb");
if (!f) {
int err = AVERROR(EINVAL);
av_log(ctx, AV_LOG_ERROR, "cannot open file %s: %s\n", filename, av_err2str(err));
av_freep(&buffer);
return err;
}
init_put_bits(&buf, buffer, len);
put_bits32(&buf, 1); /* NumOfSpatial Regions, only 1 supported */
put_bits(&buf, 1, 1); /* SpatialLocationFlag, always the whole image */
put_bits32(&buf, 0); /* PixelX,1 PixelY,1, 0,0 */
put_bits(&buf, 16, sc->w-1 & 0xFFFF); /* PixelX,2 */
put_bits(&buf, 16, sc->h-1 & 0xFFFF); /* PixelY,2 */
put_bits32(&buf, 0); /* StartFrameOfSpatialRegion */
put_bits32(&buf, sc->lastindex); /* NumOfFrames */
/* hoping num is 1, other values are vague */
/* den/num might be greater than 16 bit, so cutting it */
put_bits(&buf, 16, 0xFFFF & (sc->time_base.den / sc->time_base.num)); /* MediaTimeUnit */
put_bits(&buf, 1, 1); /* MediaTimeFlagOfSpatialRegion */
put_bits32(&buf, 0); /* StartMediaTimeOfSpatialRegion */
put_bits32(&buf, 0xFFFFFFFF & sc->coarseend->last->pts); /* EndMediaTimeOfSpatialRegion */
put_bits32(&buf, numofsegments); /* NumOfSegments */
/* coarsesignatures */
for (cs = sc->coarsesiglist; cs; cs = cs->next) {
put_bits32(&buf, cs->first->index); /* StartFrameOfSegment */
put_bits32(&buf, cs->last->index); /* EndFrameOfSegment */
put_bits(&buf, 1, 1); /* MediaTimeFlagOfSegment */
put_bits32(&buf, 0xFFFFFFFF & cs->first->pts); /* StartMediaTimeOfSegment */
put_bits32(&buf, 0xFFFFFFFF & cs->last->pts); /* EndMediaTimeOfSegment */
for (i = 0; i < 5; i++) {
/* put 243 bits ( = 7 * 32 + 19 = 8 * 28 + 19) into buffer */
for (j = 0; j < 30; j++) {
put_bits(&buf, 8, cs->data[i][j]);
}
put_bits(&buf, 3, cs->data[i][30] >> 5);
}
}
/* finesignatures */
put_bits(&buf, 1, 0); /* CompressionFlag, only 0 supported */
for (fs = sc->finesiglist; fs; fs = fs->next) {
put_bits(&buf, 1, 1); /* MediaTimeFlagOfFrame */
put_bits32(&buf, 0xFFFFFFFF & fs->pts); /* MediaTimeOfFrame */
put_bits(&buf, 8, fs->confidence); /* FrameConfidence */
for (i = 0; i < 5; i++) {
put_bits(&buf, 8, fs->words[i]); /* Words */
}
/* framesignature */
for (i = 0; i < SIGELEM_SIZE/5; i++) {
put_bits(&buf, 8, fs->framesig[i]);
}
}
flush_put_bits(&buf);
fwrite(buffer, 1, put_bytes_output(&buf), f);
fclose(f);
av_freep(&buffer);
return 0;
}
static int export(AVFilterContext *ctx, StreamContext *sc, int input)
{
SignatureContext* sic = ctx->priv;
char filename[1024];
if (sic->nb_inputs > 1) {
/* error already handled */
av_assert0(av_get_frame_filename(filename, sizeof(filename), sic->filename, input) == 0);
} else {
if (av_strlcpy(filename, sic->filename, sizeof(filename)) >= sizeof(filename))
return AVERROR(EINVAL);
}
if (sic->format == FORMAT_XML) {
return xml_export(ctx, sc, filename);
} else {
return binary_export(ctx, sc, filename);
}
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SignatureContext *sic = ctx->priv;
StreamContext *sc, *sc2;
MatchingInfo match;
int i, j, ret;
int lookup = 1; /* indicates wheather EOF of all files is reached */
/* process all inputs */
for (i = 0; i < sic->nb_inputs; i++){
sc = &(sic->streamcontexts[i]);
ret = ff_request_frame(ctx->inputs[i]);
/* return if unexpected error occurs in input stream */
if (ret < 0 && ret != AVERROR_EOF)
return ret;
/* export signature at EOF */
if (ret == AVERROR_EOF && !sc->exported) {
/* export if wanted */
if (strlen(sic->filename) > 0) {
if (export(ctx, sc, i) < 0)
return ret;
}
sc->exported = 1;
}
lookup &= sc->exported;
}
/* signature lookup */
if (lookup && sic->mode != MODE_OFF) {
/* iterate over every pair */
for (i = 0; i < sic->nb_inputs; i++) {
sc = &(sic->streamcontexts[i]);
for (j = i+1; j < sic->nb_inputs; j++) {
sc2 = &(sic->streamcontexts[j]);
match = lookup_signatures(ctx, sic, sc, sc2, sic->mode);
if (match.score != 0) {
av_log(ctx, AV_LOG_INFO, "matching of video %d at %f and %d at %f, %d frames matching\n",
i, ((double) match.first->pts * sc->time_base.num) / sc->time_base.den,
j, ((double) match.second->pts * sc2->time_base.num) / sc2->time_base.den,
match.matchframes);
if (match.whole)
av_log(ctx, AV_LOG_INFO, "whole video matching\n");
} else {
av_log(ctx, AV_LOG_INFO, "no matching of video %d and %d\n", i, j);
}
}
}
}
return ret;
}
static av_cold int init(AVFilterContext *ctx)
{
SignatureContext *sic = ctx->priv;
StreamContext *sc;
int i, ret;
char tmp[1024];
sic->streamcontexts = av_mallocz(sic->nb_inputs * sizeof(StreamContext));
if (!sic->streamcontexts)
return AVERROR(ENOMEM);
for (i = 0; i < sic->nb_inputs; i++) {
AVFilterPad pad = {
.type = AVMEDIA_TYPE_VIDEO,
.name = av_asprintf("in%d", i),
.config_props = config_input,
.filter_frame = filter_frame,
};
if (!pad.name)
return AVERROR(ENOMEM);
if ((ret = ff_append_inpad_free_name(ctx, &pad)) < 0)
return ret;
sc = &(sic->streamcontexts[i]);
sc->lastindex = 0;
sc->finesiglist = av_mallocz(sizeof(FineSignature));
if (!sc->finesiglist)
return AVERROR(ENOMEM);
sc->curfinesig = NULL;
sc->coarsesiglist = av_mallocz(sizeof(CoarseSignature));
if (!sc->coarsesiglist)
return AVERROR(ENOMEM);
sc->curcoarsesig1 = sc->coarsesiglist;
sc->coarseend = sc->coarsesiglist;
sc->coarsecount = 0;
sc->midcoarse = 0;
}
/* check filename */
if (sic->nb_inputs > 1 && strlen(sic->filename) > 0 && av_get_frame_filename(tmp, sizeof(tmp), sic->filename, 0) == -1) {
av_log(ctx, AV_LOG_ERROR, "The filename must contain %%d or %%0nd, if you have more than one input.\n");
return AVERROR(EINVAL);
}
return 0;
}
static av_cold void uninit(AVFilterContext *ctx)
{
SignatureContext *sic = ctx->priv;
StreamContext *sc;
void* tmp;
FineSignature* finsig;
CoarseSignature* cousig;
int i;
/* free the lists */
if (sic->streamcontexts != NULL) {
for (i = 0; i < sic->nb_inputs; i++) {
sc = &(sic->streamcontexts[i]);
finsig = sc->finesiglist;
cousig = sc->coarsesiglist;
while (finsig) {
tmp = finsig;
finsig = finsig->next;
av_freep(&tmp);
}
sc->finesiglist = NULL;
while (cousig) {
tmp = cousig;
cousig = cousig->next;
av_freep(&tmp);
}
sc->coarsesiglist = NULL;
}
av_freep(&sic->streamcontexts);
}
}
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = ctx->inputs[0];
FilterLink *il = ff_filter_link(inlink);
FilterLink *ol = ff_filter_link(outlink);
outlink->time_base = inlink->time_base;
ol->frame_rate = il->frame_rate;
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
outlink->w = inlink->w;
outlink->h = inlink->h;
return 0;
}
static const AVFilterPad signature_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.request_frame = request_frame,
.config_props = config_output,
},
};
const AVFilter ff_vf_signature = {
.name = "signature",
.description = NULL_IF_CONFIG_SMALL("Calculate the MPEG-7 video signature"),
.priv_size = sizeof(SignatureContext),
.priv_class = &signature_class,
.init = init,
.uninit = uninit,
FILTER_OUTPUTS(signature_outputs),
.inputs = NULL,
FILTER_PIXFMTS_ARRAY(pix_fmts),
.flags = AVFILTER_FLAG_DYNAMIC_INPUTS,
};