/* * Copyright (c) 2015 Himangi Saraogi <himangi774@gmail.com> * * 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 detelecine filter. */ #include "libavutil/avstring.h" #include "libavutil/imgutils.h" #include "libavutil/opt.h" #include "libavutil/pixdesc.h" #include "avfilter.h" #include "formats.h" #include "internal.h" #include "video.h" typedef struct { const AVClass *class; int first_field; char *pattern; int start_frame; unsigned int pattern_pos; unsigned int nskip_fields; int64_t start_time; AVRational pts; AVRational ts_unit; int occupied; int nb_planes; int planeheight[4]; int stride[4]; AVFrame *frame; AVFrame *temp; } DetelecineContext; #define OFFSET(x) offsetof(DetelecineContext, x) #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM static const AVOption detelecine_options[] = { {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"}, {"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"}, {"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"}, {"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"}, {"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"}, {"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS}, {"start_frame", "position of first frame with respect to the pattern if stream is cut", OFFSET(start_frame), AV_OPT_TYPE_INT, {.i64=0}, 0, 13, FLAGS}, {NULL} }; AVFILTER_DEFINE_CLASS(detelecine); static av_cold int init(AVFilterContext *ctx) { DetelecineContext *s = ctx->priv; const char *p; int max = 0; if (!strlen(s->pattern)) { av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n"); return AVERROR_INVALIDDATA; } for (p = s->pattern; *p; p++) { if (!av_isdigit(*p)) { av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n"); return AVERROR_INVALIDDATA; } max = FFMAX(*p - '0', max); s->pts.num += *p - '0'; s->pts.den += 2; } s->nskip_fields = 0; s->pattern_pos = 0; s->start_time = AV_NOPTS_VALUE; if (s->start_frame != 0) { int nfields = 0; for (p = s->pattern; *p; p++) { nfields += *p - '0'; s->pattern_pos++; if (nfields >= 2*s->start_frame) { s->nskip_fields = nfields - 2*s->start_frame; break; } } } av_log(ctx, AV_LOG_INFO, "Detelecine pattern %s removes up to %d frames per frame, pts advance factor: %d/%d\n", s->pattern, (max + 1) / 2, s->pts.num, s->pts.den); return 0; } static int query_formats(AVFilterContext *ctx) { AVFilterFormats *pix_fmts = NULL; int fmt; for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) { const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt); if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL || desc->flags & AV_PIX_FMT_FLAG_PAL || desc->flags & AV_PIX_FMT_FLAG_BITSTREAM)) ff_add_format(&pix_fmts, fmt); } return ff_set_common_formats(ctx, pix_fmts); } static int config_input(AVFilterLink *inlink) { DetelecineContext *s = inlink->dst->priv; const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); int ret; s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h); if (!s->temp) return AVERROR(ENOMEM); s->frame = ff_get_video_buffer(inlink, inlink->w, inlink->h); if (!s->frame) return AVERROR(ENOMEM); if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0) return ret; s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); s->planeheight[0] = s->planeheight[3] = inlink->h; s->nb_planes = av_pix_fmt_count_planes(inlink->format); return 0; } static int config_output(AVFilterLink *outlink) { AVFilterContext *ctx = outlink->src; DetelecineContext *s = ctx->priv; const AVFilterLink *inlink = ctx->inputs[0]; AVRational fps = inlink->frame_rate; if (!fps.num || !fps.den) { av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; " "current rate of %d/%d is invalid\n", fps.num, fps.den); return AVERROR(EINVAL); } fps = av_mul_q(fps, av_inv_q(s->pts)); av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n", inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den); outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; outlink->frame_rate = fps; outlink->time_base = av_mul_q(inlink->time_base, s->pts); av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n", inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den); s->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base)); return 0; } static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref) { AVFilterContext *ctx = inlink->dst; AVFilterLink *outlink = ctx->outputs[0]; DetelecineContext *s = ctx->priv; int i, len = 0, ret = 0, out = 0; if (s->start_time == AV_NOPTS_VALUE) s->start_time = inpicref->pts; if (s->nskip_fields >= 2) { s->nskip_fields -= 2; return 0; } else if (s->nskip_fields >= 1) { if (s->occupied) { s->occupied = 0; s->nskip_fields--; } else { for (i = 0; i < s->nb_planes; i++) { av_image_copy_plane(s->temp->data[i], s->temp->linesize[i], inpicref->data[i], inpicref->linesize[i], s->stride[i], s->planeheight[i]); } s->occupied = 1; s->nskip_fields--; return 0; } } if (s->nskip_fields == 0) { while(!len && s->pattern[s->pattern_pos]) { len = s->pattern[s->pattern_pos] - '0'; s->pattern_pos++; } if (!s->pattern[s->pattern_pos]) s->pattern_pos = 0; if(!len) { // do not output any field as the entire pattern is zero av_frame_free(&inpicref); return 0; } if (s->occupied) { for (i = 0; i < s->nb_planes; i++) { // fill in the EARLIER field from the new pic av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * s->first_field, s->frame->linesize[i] * 2, inpicref->data[i] + inpicref->linesize[i] * s->first_field, inpicref->linesize[i] * 2, s->stride[i], (s->planeheight[i] - s->first_field + 1) / 2); // fill in the LATER field from the buffered pic av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * !s->first_field, s->frame->linesize[i] * 2, s->temp->data[i] + s->temp->linesize[i] * !s->first_field, s->temp->linesize[i] * 2, s->stride[i], (s->planeheight[i] - !s->first_field + 1) / 2); } len -= 2; for (i = 0; i < s->nb_planes; i++) { av_image_copy_plane(s->temp->data[i], s->temp->linesize[i], inpicref->data[i], inpicref->linesize[i], s->stride[i], s->planeheight[i]); } s->occupied = 1; out = 1; } else { if (len >= 2) { // output THIS image as-is for (i = 0; i < s->nb_planes; i++) av_image_copy_plane(s->frame->data[i], s->frame->linesize[i], inpicref->data[i], inpicref->linesize[i], s->stride[i], s->planeheight[i]); len -= 2; out = 1; } else if (len == 1) { // fill in the EARLIER field from the new pic for (i = 0; i < s->nb_planes; i++) { av_image_copy_plane(s->frame->data[i] + s->frame->linesize[i] * s->first_field, s->frame->linesize[i] * 2, inpicref->data[i] + inpicref->linesize[i] * s->first_field, inpicref->linesize[i] * 2, s->stride[i], (s->planeheight[i] - s->first_field + 1) / 2); } // TODO: not sure about the other field len--; out = 1; } } if (len == 1 && s->occupied) { len--; s->occupied = 0; } } s->nskip_fields = len; if (out) { AVFrame *frame = av_frame_clone(s->frame); if (!frame) { av_frame_free(&inpicref); return AVERROR(ENOMEM); } av_frame_copy_props(frame, inpicref); frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) + av_rescale(outlink->frame_count, s->ts_unit.num, s->ts_unit.den); ret = ff_filter_frame(outlink, frame); } av_frame_free(&inpicref); return ret; } static av_cold void uninit(AVFilterContext *ctx) { DetelecineContext *s = ctx->priv; av_frame_free(&s->temp); av_frame_free(&s->frame); } static const AVFilterPad detelecine_inputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .filter_frame = filter_frame, .config_props = config_input, }, { NULL } }; static const AVFilterPad detelecine_outputs[] = { { .name = "default", .type = AVMEDIA_TYPE_VIDEO, .config_props = config_output, }, { NULL } }; AVFilter ff_vf_detelecine = { .name = "detelecine", .description = NULL_IF_CONFIG_SMALL("Apply an inverse telecine pattern."), .priv_size = sizeof(DetelecineContext), .priv_class = &detelecine_class, .init = init, .uninit = uninit, .query_formats = query_formats, .inputs = detelecine_inputs, .outputs = detelecine_outputs, };