/* * Copyright (c) 2016 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 */ /** * @file * filter for manipulating frame metadata */ #include <float.h> #include "libavutil/avassert.h"#include "libavutil/avstring.h"#include "libavutil/eval.h"#include "libavutil/internal.h"#include "libavutil/opt.h"#include "libavutil/timestamp.h"#include "libavformat/avio.h"#include "avfilter.h"#include "audio.h"#include "formats.h"#include "internal.h"#include "video.h" enum MetadataMode {    METADATA_SELECT,    METADATA_ADD,    METADATA_MODIFY,    METADATA_DELETE,    METADATA_PRINT,    METADATA_NB}; enum MetadataFunction {    METADATAF_SAME_STR,    METADATAF_STARTS_WITH,    METADATAF_LESS,    METADATAF_EQUAL,    METADATAF_GREATER,    METADATAF_EXPR,    METADATAF_NB}; static const char *const var_names[] = {    "VALUE1",    "VALUE2",    NULL}; enum var_name {    VAR_VALUE1,    VAR_VALUE2,    VAR_VARS_NB}; typedef struct MetadataContext {    const AVClass *class;     int mode;    char *key;    char *value;    int function;     char *expr_str;    AVExpr *expr;    double var_values[VAR_VARS_NB];     AVIOContext* avio_context;    char *file_str;     int (*compare)(struct MetadataContext *s,                   const char *value1, const char *value2);    void (*print)(AVFilterContext *ctx, const char *msg, ...) av_printf_format(2, 3);} MetadataContext; #define OFFSET(x) offsetof(MetadataContext, x)#define DEFINE_OPTIONS(filt_name, FLAGS) \static const AVOption filt_name##_options[] = { \    { "mode", "set a mode of operation", OFFSET(mode),   AV_OPT_TYPE_INT,    {.i64 = 0 }, 0, METADATA_NB-1, FLAGS, "mode" }, \    {   "select", "select frame",        0,              AV_OPT_TYPE_CONST,  {.i64 = METADATA_SELECT }, 0, 0, FLAGS, "mode" }, \    {   "add",    "add new metadata",    0,              AV_OPT_TYPE_CONST,  {.i64 = METADATA_ADD },    0, 0, FLAGS, "mode" }, \    {   "modify", "modify metadata",     0,              AV_OPT_TYPE_CONST,  {.i64 = METADATA_MODIFY }, 0, 0, FLAGS, "mode" }, \    {   "delete", "delete metadata",     0,              AV_OPT_TYPE_CONST,  {.i64 = METADATA_DELETE }, 0, 0, FLAGS, "mode" }, \    {   "print",  "print metadata",      0,              AV_OPT_TYPE_CONST,  {.i64 = METADATA_PRINT },  0, 0, FLAGS, "mode" }, \    { "key",   "set metadata key",       OFFSET(key),    AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \    { "value", "set metadata value",     OFFSET(value),  AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \    { "function", "function for comparing values", OFFSET(function), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, METADATAF_NB-1, FLAGS, "function" }, \    {   "same_str",    NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_SAME_STR },    0, 3, FLAGS, "function" }, \    {   "starts_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_STARTS_WITH }, 0, 0, FLAGS, "function" }, \    {   "less",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_LESS    },     0, 3, FLAGS, "function" }, \    {   "equal",       NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EQUAL   },     0, 3, FLAGS, "function" }, \    {   "greater",     NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_GREATER },     0, 3, FLAGS, "function" }, \    {   "expr",        NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_EXPR    },     0, 3, FLAGS, "function" }, \    { "expr", "set expression for expr function", OFFSET(expr_str), AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \    { "file", "set file where to print metadata information", OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \    { NULL } \} static int same_str(MetadataContext *s, const char *value1, const char *value2){    return !strcmp(value1, value2);} static int starts_with(MetadataContext *s, const char *value1, const char *value2){    return !strncmp(value1, value2, strlen(value2));} static int equal(MetadataContext *s, const char *value1, const char *value2){    float f1, f2;     if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)        return 0;     return fabsf(f1 - f2) < FLT_EPSILON;} static int less(MetadataContext *s, const char *value1, const char *value2){    float f1, f2;     if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)        return 0;     return (f1 - f2) < FLT_EPSILON;} static int greater(MetadataContext *s, const char *value1, const char *value2){    float f1, f2;     if (sscanf(value1, "%f", &f1) + sscanf(value2, "%f", &f2) != 2)        return 0;     return (f2 - f1) < FLT_EPSILON;} static int parse_expr(MetadataContext *s, const char *value1, const char *value2){    double f1, f2;     if (sscanf(value1, "%lf", &f1) + sscanf(value2, "%lf", &f2) != 2)        return 0;     s->var_values[VAR_VALUE1] = f1;    s->var_values[VAR_VALUE2] = f2;     return av_expr_eval(s->expr, s->var_values, NULL);} static void print_log(AVFilterContext *ctx, const char *msg, ...){    va_list argument_list;     va_start(argument_list, msg);    if (msg)        av_vlog(ctx, AV_LOG_INFO, msg, argument_list);    va_end(argument_list);} static void print_file(AVFilterContext *ctx, const char *msg, ...){    MetadataContext *s = ctx->priv;    va_list argument_list;     va_start(argument_list, msg);    if (msg) {        char buf[128];        vsnprintf(buf, sizeof(buf), msg, argument_list);        avio_write(s->avio_context, buf, av_strnlen(buf, sizeof(buf)));    }    va_end(argument_list);} static av_cold int init(AVFilterContext *ctx){    MetadataContext *s = ctx->priv;    int ret;     if (!s->key && s->mode != METADATA_PRINT && s->mode != METADATA_DELETE) {        av_log(ctx, AV_LOG_WARNING, "Metadata key must be set\n");        return AVERROR(EINVAL);    }     if ((s->mode == METADATA_MODIFY ||        s->mode == METADATA_ADD) && !s->value) {        av_log(ctx, AV_LOG_WARNING, "Missing metadata value\n");        return AVERROR(EINVAL);    }     switch (s->function) {    case METADATAF_SAME_STR:        s->compare = same_str;        break;    case METADATAF_STARTS_WITH:        s->compare = starts_with;        break;    case METADATAF_LESS:        s->compare = less;        break;    case METADATAF_EQUAL:        s->compare = equal;        break;    case METADATAF_GREATER:        s->compare = greater;        break;    case METADATAF_EXPR:        s->compare = parse_expr;        break;    default:        av_assert0(0);    };     if (s->function == METADATAF_EXPR) {        if (!s->expr_str) {            av_log(ctx, AV_LOG_WARNING, "expr option not set\n");            return AVERROR(EINVAL);        }        if ((ret = av_expr_parse(&s->expr, s->expr_str,                                 var_names, NULL, NULL, NULL, NULL, 0, ctx)) < 0) {            av_log(ctx, AV_LOG_ERROR, "Error while parsing expression '%s'\n", s->expr_str);            return ret;        }    }     if (s->mode == METADATA_PRINT && s->file_str) {        s->print = print_file;    } else {        s->print = print_log;    }     s->avio_context = NULL;    if (s->file_str) {        if (!strcmp("-", s->file_str)) {            ret = avio_open(&s->avio_context, "pipe:1", AVIO_FLAG_WRITE);        } else {            ret = avio_open(&s->avio_context, s->file_str, AVIO_FLAG_WRITE);        }         if (ret < 0) {            char buf[128];            av_strerror(ret, buf, sizeof(buf));            av_log(ctx, AV_LOG_ERROR, "Could not open %s: %s\n",                   s->file_str, buf);            return ret;        }    }     return 0;} static av_cold void uninit(AVFilterContext *ctx){    MetadataContext *s = ctx->priv;     if (s->avio_context) {        avio_closep(&s->avio_context);    }} static int filter_frame(AVFilterLink *inlink, AVFrame *frame){    AVFilterContext *ctx = inlink->dst;    AVFilterLink *outlink = ctx->outputs[0];    MetadataContext *s = ctx->priv;    AVDictionary **metadata = avpriv_frame_get_metadatap(frame);    AVDictionaryEntry *e;     if (!*metadata)        return ff_filter_frame(outlink, frame);     e = av_dict_get(*metadata, !s->key ? "" : s->key, NULL,                    !s->key ? AV_DICT_IGNORE_SUFFIX: 0);     switch (s->mode) {    case METADATA_SELECT:        if (!s->value && e && e->value) {            return ff_filter_frame(outlink, frame);        } else if (s->value && e && e->value &&                   s->compare(s, e->value, s->value)) {            return ff_filter_frame(outlink, frame);        }        break;    case METADATA_ADD:        if (e && e->value) {            ;        } else {            av_dict_set(metadata, s->key, s->value, 0);        }        return ff_filter_frame(outlink, frame);        break;    case METADATA_MODIFY:        if (e && e->value) {            av_dict_set(metadata, s->key, s->value, 0);        }        return ff_filter_frame(outlink, frame);        break;    case METADATA_PRINT:        if (!s->key && e) {            s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%-7s\n",                     inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));            s->print(ctx, "%s=%s\n", e->key, e->value);            while ((e = av_dict_get(*metadata, "", e, AV_DICT_IGNORE_SUFFIX)) != NULL) {                s->print(ctx, "%s=%s\n", e->key, e->value);            }        } else if (e && e->value && (!s->value || (e->value && s->compare(s, e->value, s->value)))) {            s->print(ctx, "frame:%-4"PRId64" pts:%-7s pts_time:%-7s\n",                     inlink->frame_count_out, av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));            s->print(ctx, "%s=%s\n", s->key, e->value);        }        return ff_filter_frame(outlink, frame);        break;    case METADATA_DELETE:        if (!s->key) {            av_dict_free(metadata);        } else if (e && e->value && (!s->value || s->compare(s, e->value, s->value))) {            av_dict_set(metadata, s->key, NULL, 0);        }        return ff_filter_frame(outlink, frame);        break;    default:        av_assert0(0);    };     av_frame_free(&frame);     return 0;} #if CONFIG_AMETADATA_FILTER DEFINE_OPTIONS(ametadata, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);AVFILTER_DEFINE_CLASS(ametadata); static const AVFilterPad ainputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_AUDIO,        .filter_frame = filter_frame,    },    { NULL }}; static const AVFilterPad aoutputs[] = {    {        .name = "default",        .type = AVMEDIA_TYPE_AUDIO,    },    { NULL }}; AVFilter ff_af_ametadata = {    .name          = "ametadata",    .description   = NULL_IF_CONFIG_SMALL("Manipulate audio frame metadata."),    .priv_size     = sizeof(MetadataContext),    .priv_class    = &ametadata_class,    .init          = init,    .uninit        = uninit,    .inputs        = ainputs,    .outputs       = aoutputs,    .flags         = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,};#endif /* CONFIG_AMETADATA_FILTER */ #if CONFIG_METADATA_FILTER DEFINE_OPTIONS(metadata, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);AVFILTER_DEFINE_CLASS(metadata); static const AVFilterPad inputs[] = {    {        .name         = "default",        .type         = AVMEDIA_TYPE_VIDEO,        .filter_frame = filter_frame,    },    { NULL }}; static const AVFilterPad outputs[] = {    {        .name = "default",        .type = AVMEDIA_TYPE_VIDEO,    },    { NULL }}; AVFilter ff_vf_metadata = {    .name        = "metadata",    .description = NULL_IF_CONFIG_SMALL("Manipulate video frame metadata."),    .priv_size   = sizeof(MetadataContext),    .priv_class  = &metadata_class,    .init        = init,    .uninit      = uninit,    .inputs      = inputs,    .outputs     = outputs,    .flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,};#endif /* CONFIG_METADATA_FILTER */