diff options
Diffstat (limited to 'libavfilter/vf_telecine.c')
-rw-r--r-- | libavfilter/vf_telecine.c | 285 |
1 files changed, 285 insertions, 0 deletions
diff --git a/libavfilter/vf_telecine.c b/libavfilter/vf_telecine.c new file mode 100644 index 0000000..a0f28d4 --- /dev/null +++ b/libavfilter/vf_telecine.c @@ -0,0 +1,285 @@ +/* + * Copyright (c) 2012 Rudolf Polzer + * Copyright (c) 2013 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 telecine filter, heavily based from mpv-player:TOOLS/vf_dlopen/telecine.c by + * Rudolf Polzer. + */ + +#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; + unsigned int pattern_pos; + + AVRational pts; + double ts_unit; + int out_cnt; + int occupied; + + int nb_planes; + int planeheight[4]; + int stride[4]; + + AVFrame *frame[5]; + AVFrame *temp; +} TelecineContext; + +#define OFFSET(x) offsetof(TelecineContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption telecine_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}, + {NULL} +}; + +AVFILTER_DEFINE_CLASS(telecine); + +static av_cold int init(AVFilterContext *ctx) +{ + TelecineContext *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 += 2; + s->pts.den += *p - '0'; + } + + s->out_cnt = (max + 1) / 2; + av_log(ctx, AV_LOG_INFO, "Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n", + s->pattern, s->out_cnt, 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); + } + + ff_set_common_formats(ctx, pix_fmts); + return 0; +} + +static int config_input(AVFilterLink *inlink) +{ + TelecineContext *s = inlink->dst->priv; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); + int i, ret; + + s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h); + if (!s->temp) + return AVERROR(ENOMEM); + for (i = 0; i < s->out_cnt; i++) { + s->frame[i] = ff_get_video_buffer(inlink, inlink->w, inlink->h); + if (!s->frame[i]) + 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; + TelecineContext *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_q2d(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]; + TelecineContext *s = ctx->priv; + int i, len, ret = 0, nout = 0; + + 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 from this frame + av_frame_free(&inpicref); + return 0; + } + + if (s->occupied) { + for (i = 0; i < s->nb_planes; i++) { + // fill in the EARLIER field from the buffered pic + av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * s->first_field, + s->frame[nout]->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); + // fill in the LATER field from the new pic + av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * !s->first_field, + s->frame[nout]->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); + } + nout++; + len--; + s->occupied = 0; + } + + while (len >= 2) { + // output THIS image as-is + for (i = 0; i < s->nb_planes; i++) + av_image_copy_plane(s->frame[nout]->data[i], s->frame[nout]->linesize[i], + inpicref->data[i], inpicref->linesize[i], + s->stride[i], + s->planeheight[i]); + nout++; + len -= 2; + } + + if (len >= 1) { + // copy THIS image to the buffer, we need it later + 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; + } + + for (i = 0; i < nout; i++) { + AVFrame *frame = av_frame_clone(s->frame[i]); + + if (!frame) { + av_frame_free(&inpicref); + return AVERROR(ENOMEM); + } + + frame->pts = outlink->frame_count * s->ts_unit; + ret = ff_filter_frame(outlink, frame); + } + av_frame_free(&inpicref); + + return ret; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + TelecineContext *s = ctx->priv; + int i; + + av_frame_free(&s->temp); + for (i = 0; i < s->out_cnt; i++) + av_frame_free(&s->frame[i]); +} + +static const AVFilterPad telecine_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_input, + }, + { NULL } +}; + +static const AVFilterPad telecine_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output, + }, + { NULL } +}; + +AVFilter ff_vf_telecine = { + .name = "telecine", + .description = NULL_IF_CONFIG_SMALL("Apply a telecine pattern."), + .priv_size = sizeof(TelecineContext), + .priv_class = &telecine_class, + .init = init, + .uninit = uninit, + .query_formats = query_formats, + .inputs = telecine_inputs, + .outputs = telecine_outputs, +}; |