mirror of https://github.com/FFmpeg/FFmpeg.git
Paul B Mahol
10 years ago
parent
494b792441
commit
1bf7bd194b
7 changed files with 183 additions and 1 deletions
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/*
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* Copyright (c) 2015 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <tesseract/capi.h> |
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#include "libavutil/opt.h" |
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#include "avfilter.h" |
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#include "formats.h" |
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#include "internal.h" |
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#include "video.h" |
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typedef struct OCRContext { |
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const AVClass *class; |
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char *datapath; |
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char *language; |
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char *whitelist; |
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char *blacklist; |
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TessBaseAPI *tess; |
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} OCRContext; |
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#define OFFSET(x) offsetof(OCRContext, x) |
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#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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static const AVOption ocr_options[] = { |
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{ "datapath", "set datapath", OFFSET(datapath), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, |
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{ "language", "set language", OFFSET(language), AV_OPT_TYPE_STRING, {.str="eng"}, 0, 0, FLAGS }, |
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{ "whitelist", "set character whitelist", OFFSET(whitelist), AV_OPT_TYPE_STRING, {.str="0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ.:;,-+_!?\"'[]{}()<>|/\\=*&%$#@!~"}, 0, 0, FLAGS }, |
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{ "blacklist", "set character blacklist", OFFSET(blacklist), AV_OPT_TYPE_STRING, {.str=""}, 0, 0, FLAGS }, |
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{ NULL } |
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}; |
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static av_cold int init(AVFilterContext *ctx) |
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{ |
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OCRContext *s = ctx->priv; |
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s->tess = TessBaseAPICreate(); |
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if (TessBaseAPIInit3(s->tess, s->datapath, s->language) == -1) { |
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av_log(ctx, AV_LOG_ERROR, "failed to init tesseract\n"); |
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return AVERROR(EINVAL); |
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} |
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if (!TessBaseAPISetVariable(s->tess, "tessedit_char_whitelist", s->whitelist)) { |
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av_log(ctx, AV_LOG_ERROR, "failed to set whitelist\n"); |
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return AVERROR(EINVAL); |
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} |
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if (!TessBaseAPISetVariable(s->tess, "tessedit_char_blacklist", s->blacklist)) { |
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av_log(ctx, AV_LOG_ERROR, "failed to set blacklist\n"); |
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return AVERROR(EINVAL); |
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} |
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av_log(ctx, AV_LOG_DEBUG, "Tesseract version: %s\n", TessVersion()); |
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return 0; |
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} |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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static const enum AVPixelFormat pix_fmts[] = { |
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AV_PIX_FMT_GRAY8, |
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AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P, |
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AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, |
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AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P, |
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AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, |
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AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ444P, |
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AV_PIX_FMT_YUVJ411P, |
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AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, |
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AV_PIX_FMT_NONE |
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}; |
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AVFilterFormats *fmts_list = ff_make_format_list(pix_fmts); |
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if (!fmts_list) |
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return AVERROR(ENOMEM); |
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ff_set_common_formats(ctx, fmts_list); |
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return 0; |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
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{ |
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AVDictionary **metadata = avpriv_frame_get_metadatap(in); |
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AVFilterContext *ctx = inlink->dst; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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OCRContext *s = ctx->priv; |
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char *result; |
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result = TessBaseAPIRect(s->tess, in->data[0], 1, |
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in->linesize[0], 0, 0, in->width, in->height); |
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av_dict_set(metadata, "lavfi.ocr.text", result, 0); |
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TessDeleteText(result); |
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return ff_filter_frame(outlink, in); |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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OCRContext *s = ctx->priv; |
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TessBaseAPIEnd(s->tess); |
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TessBaseAPIDelete(s->tess); |
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} |
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AVFILTER_DEFINE_CLASS(ocr); |
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static const AVFilterPad ocr_inputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.filter_frame = filter_frame, |
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}, |
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{ NULL } |
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}; |
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static const AVFilterPad ocr_outputs[] = { |
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{ |
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.name = "default", |
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.type = AVMEDIA_TYPE_VIDEO, |
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}, |
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{ NULL } |
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}; |
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AVFilter ff_vf_ocr = { |
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.name = "ocr", |
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.description = NULL_IF_CONFIG_SMALL("Optical Character Recognition."), |
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.priv_size = sizeof(OCRContext), |
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.priv_class = &ocr_class, |
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.query_formats = query_formats, |
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.init = init, |
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.uninit = uninit, |
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.inputs = ocr_inputs, |
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.outputs = ocr_outputs, |
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}; |
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