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Diffstat (limited to 'libavfilter/vf_tinterlace.c')
| -rw-r--r-- | libavfilter/vf_tinterlace.c | 382 |
1 files changed, 382 insertions, 0 deletions
diff --git a/libavfilter/vf_tinterlace.c b/libavfilter/vf_tinterlace.c new file mode 100644 index 0000000000..1f4de81fc7 --- /dev/null +++ b/libavfilter/vf_tinterlace.c @@ -0,0 +1,382 @@ +/* + * Copyright (c) 2011 Stefano Sabatini + * Copyright (c) 2010 Baptiste Coudurier + * Copyright (c) 2003 Michael Zucchi <notzed@ximian.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 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 + * temporal field interlace filter, ported from MPlayer/libmpcodecs + */ + +#include "libavutil/opt.h" +#include "libavutil/imgutils.h" +#include "libavutil/avassert.h" +#include "avfilter.h" +#include "internal.h" + +enum TInterlaceMode { + MODE_MERGE = 0, + MODE_DROP_EVEN, + MODE_DROP_ODD, + MODE_PAD, + MODE_INTERLEAVE_TOP, + MODE_INTERLEAVE_BOTTOM, + MODE_INTERLACEX2, + MODE_NB, +}; + +typedef struct { + const AVClass *class; + enum TInterlaceMode mode; ///< interlace mode selected + int flags; ///< flags affecting interlacing algorithm + int frame; ///< number of the output frame + int vsub; ///< chroma vertical subsampling + AVFrame *cur; + AVFrame *next; + uint8_t *black_data[4]; ///< buffer used to fill padded lines + int black_linesize[4]; +} TInterlaceContext; + +#define OFFSET(x) offsetof(TInterlaceContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM +#define TINTERLACE_FLAG_VLPF 01 + +static const AVOption tinterlace_options[] = { + {"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"}, + {"merge", "merge fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGE}, INT_MIN, INT_MAX, FLAGS, "mode"}, + {"drop_even", "drop even fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_EVEN}, INT_MIN, INT_MAX, FLAGS, "mode"}, + {"drop_odd", "drop odd fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_ODD}, INT_MIN, INT_MAX, FLAGS, "mode"}, + {"pad", "pad alternate lines with black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PAD}, INT_MIN, INT_MAX, FLAGS, "mode"}, + {"interleave_top", "interleave top and bottom fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_TOP}, INT_MIN, INT_MAX, FLAGS, "mode"}, + {"interleave_bottom", "interleave bottom and top fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "mode"}, + {"interlacex2", "interlace fields from two consecutive frames", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLACEX2}, INT_MIN, INT_MAX, FLAGS, "mode"}, + + {"flags", "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, 0, "flags" }, + {"low_pass_filter", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" }, + {"vlpf", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" }, + + {NULL} +}; + +AVFILTER_DEFINE_CLASS(tinterlace); + +#define FULL_SCALE_YUVJ_FORMATS \ + AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P + +static enum AVPixelFormat full_scale_yuvj_pix_fmts[] = { + FULL_SCALE_YUVJ_FORMATS, AV_PIX_FMT_NONE +}; + +static int query_formats(AVFilterContext *ctx) +{ + static const enum AVPixelFormat pix_fmts[] = { + AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, + AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P, + AV_PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS, + AV_PIX_FMT_NONE + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + TInterlaceContext *tinterlace = ctx->priv; + + av_frame_free(&tinterlace->cur ); + av_frame_free(&tinterlace->next); + av_freep(&tinterlace->black_data[0]); +} + +static int config_out_props(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + AVFilterLink *inlink = outlink->src->inputs[0]; + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format); + TInterlaceContext *tinterlace = ctx->priv; + + tinterlace->vsub = desc->log2_chroma_h; + outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; + outlink->w = inlink->w; + outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD ? + inlink->h*2 : inlink->h; + + if (tinterlace->mode == MODE_PAD) { + uint8_t black[4] = { 16, 128, 128, 16 }; + int i, ret; + if (ff_fmt_is_in(outlink->format, full_scale_yuvj_pix_fmts)) + black[0] = black[3] = 0; + ret = av_image_alloc(tinterlace->black_data, tinterlace->black_linesize, + outlink->w, outlink->h, outlink->format, 1); + if (ret < 0) + return ret; + + /* fill black picture with black */ + for (i = 0; i < 4 && tinterlace->black_data[i]; i++) { + int h = i == 1 || i == 2 ? FF_CEIL_RSHIFT(outlink->h, desc->log2_chroma_h) : outlink->h; + memset(tinterlace->black_data[i], black[i], + tinterlace->black_linesize[i] * h); + } + } + if ((tinterlace->flags & TINTERLACE_FLAG_VLPF) + && !(tinterlace->mode == MODE_INTERLEAVE_TOP + || tinterlace->mode == MODE_INTERLEAVE_BOTTOM)) { + av_log(ctx, AV_LOG_WARNING, "low_pass_filter flag ignored with mode %d\n", + tinterlace->mode); + tinterlace->flags &= ~TINTERLACE_FLAG_VLPF; + } + av_log(ctx, AV_LOG_VERBOSE, "mode:%d filter:%s h:%d -> h:%d\n", + tinterlace->mode, (tinterlace->flags & TINTERLACE_FLAG_VLPF) ? "on" : "off", + inlink->h, outlink->h); + + return 0; +} + +#define FIELD_UPPER 0 +#define FIELD_LOWER 1 +#define FIELD_UPPER_AND_LOWER 2 + +/** + * Copy picture field from src to dst. + * + * @param src_field copy from upper, lower field or both + * @param interleave leave a padding line between each copied line + * @param dst_field copy to upper or lower field, + * only meaningful when interleave is selected + * @param flags context flags + */ +static inline +void copy_picture_field(uint8_t *dst[4], int dst_linesize[4], + const uint8_t *src[4], int src_linesize[4], + enum AVPixelFormat format, int w, int src_h, + int src_field, int interleave, int dst_field, + int flags) +{ + const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format); + int plane, vsub = desc->log2_chroma_h; + int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2; + int h, i; + + for (plane = 0; plane < desc->nb_components; plane++) { + int lines = plane == 1 || plane == 2 ? FF_CEIL_RSHIFT(src_h, vsub) : src_h; + int linesize = av_image_get_linesize(format, w, plane); + uint8_t *dstp = dst[plane]; + const uint8_t *srcp = src[plane]; + + if (linesize < 0) + return; + + lines = (lines + (src_field == FIELD_UPPER)) / k; + if (src_field == FIELD_LOWER) + srcp += src_linesize[plane]; + if (interleave && dst_field == FIELD_LOWER) + dstp += dst_linesize[plane]; + if (flags & TINTERLACE_FLAG_VLPF) { + // Low-pass filtering is required when creating an interlaced destination from + // a progressive source which contains high-frequency vertical detail. + // Filtering will reduce interlace 'twitter' and Moire patterning. + int srcp_linesize = src_linesize[plane] * k; + int dstp_linesize = dst_linesize[plane] * (interleave ? 2 : 1); + for (h = lines; h > 0; h--) { + const uint8_t *srcp_above = srcp - src_linesize[plane]; + const uint8_t *srcp_below = srcp + src_linesize[plane]; + if (h == lines) srcp_above = srcp; // there is no line above + if (h == 1) srcp_below = srcp; // there is no line below + for (i = 0; i < linesize; i++) { + // this calculation is an integer representation of + // '0.5 * current + 0.25 * above + 0.25 * below' + // '1 +' is for rounding. */ + dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2; + } + dstp += dstp_linesize; + srcp += srcp_linesize; + } + } else { + av_image_copy_plane(dstp, dst_linesize[plane] * (interleave ? 2 : 1), + srcp, src_linesize[plane]*k, linesize, lines); + } + } +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *picref) +{ + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = ctx->outputs[0]; + TInterlaceContext *tinterlace = ctx->priv; + AVFrame *cur, *next, *out; + int field, tff, ret; + + av_frame_free(&tinterlace->cur); + tinterlace->cur = tinterlace->next; + tinterlace->next = picref; + + cur = tinterlace->cur; + next = tinterlace->next; + /* we need at least two frames */ + if (!tinterlace->cur) + return 0; + + switch (tinterlace->mode) { + case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into + * the lower field, generating a double-height video at half framerate */ + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) + return AVERROR(ENOMEM); + av_frame_copy_props(out, cur); + out->height = outlink->h; + out->interlaced_frame = 1; + out->top_field_first = 1; + + /* write odd frame lines into the upper field of the new frame */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)cur->data, cur->linesize, + inlink->format, inlink->w, inlink->h, + FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER, tinterlace->flags); + /* write even frame lines into the lower field of the new frame */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)next->data, next->linesize, + inlink->format, inlink->w, inlink->h, + FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER, tinterlace->flags); + av_frame_free(&tinterlace->next); + break; + + case MODE_DROP_ODD: /* only output even frames, odd frames are dropped; height unchanged, half framerate */ + case MODE_DROP_EVEN: /* only output odd frames, even frames are dropped; height unchanged, half framerate */ + out = av_frame_clone(tinterlace->mode == MODE_DROP_EVEN ? cur : next); + av_frame_free(&tinterlace->next); + break; + + case MODE_PAD: /* expand each frame to double height, but pad alternate + * lines with black; framerate unchanged */ + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) + return AVERROR(ENOMEM); + av_frame_copy_props(out, cur); + out->height = outlink->h; + + field = (1 + tinterlace->frame) & 1 ? FIELD_UPPER : FIELD_LOWER; + /* copy upper and lower fields */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)cur->data, cur->linesize, + inlink->format, inlink->w, inlink->h, + FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags); + /* pad with black the other field */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)tinterlace->black_data, tinterlace->black_linesize, + inlink->format, inlink->w, inlink->h, + FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags); + break; + + /* interleave upper/lower lines from odd frames with lower/upper lines from even frames, + * halving the frame rate and preserving image height */ + case MODE_INTERLEAVE_TOP: /* top field first */ + case MODE_INTERLEAVE_BOTTOM: /* bottom field first */ + tff = tinterlace->mode == MODE_INTERLEAVE_TOP; + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) + return AVERROR(ENOMEM); + av_frame_copy_props(out, cur); + out->interlaced_frame = 1; + out->top_field_first = tff; + + /* copy upper/lower field from cur */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)cur->data, cur->linesize, + inlink->format, inlink->w, inlink->h, + tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER, + tinterlace->flags); + /* copy lower/upper field from next */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)next->data, next->linesize, + inlink->format, inlink->w, inlink->h, + tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER, + tinterlace->flags); + av_frame_free(&tinterlace->next); + break; + case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */ + /* output current frame first */ + out = av_frame_clone(cur); + if (!out) + return AVERROR(ENOMEM); + out->interlaced_frame = 1; + + if ((ret = ff_filter_frame(outlink, out)) < 0) + return ret; + + /* output mix of current and next frame */ + tff = next->top_field_first; + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) + return AVERROR(ENOMEM); + av_frame_copy_props(out, next); + out->interlaced_frame = 1; + + /* write current frame second field lines into the second field of the new frame */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)cur->data, cur->linesize, + inlink->format, inlink->w, inlink->h, + tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER, + tinterlace->flags); + /* write next frame first field lines into the first field of the new frame */ + copy_picture_field(out->data, out->linesize, + (const uint8_t **)next->data, next->linesize, + inlink->format, inlink->w, inlink->h, + tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER, + tinterlace->flags); + break; + default: + av_assert0(0); + } + + ret = ff_filter_frame(outlink, out); + tinterlace->frame++; + + return ret; +} + +static const AVFilterPad tinterlace_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad tinterlace_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_out_props, + }, + { NULL } +}; + +AVFilter avfilter_vf_tinterlace = { + .name = "tinterlace", + .description = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."), + .priv_size = sizeof(TInterlaceContext), + .uninit = uninit, + .query_formats = query_formats, + .inputs = tinterlace_inputs, + .outputs = tinterlace_outputs, + .priv_class = &tinterlace_class, +}; |