| /* |
| * 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/imgutils.h" |
| #include "avfilter.h" |
| #include "internal.h" |
| |
| typedef struct { |
| int mode; ///< interlace mode selected |
| int frame; ///< number of the output frame |
| int vsub; ///< chroma vertical subsampling |
| AVFilterBufferRef *cur; |
| AVFilterBufferRef *next; |
| uint8_t *black_data[4]; ///< buffer used to fill padded lines |
| int black_linesize[4]; |
| } TInterlaceContext; |
| |
| #define FULL_SCALE_YUVJ_FORMATS \ |
| PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUVJ440P |
| |
| static enum PixelFormat full_scale_yuvj_pix_fmts[] = { |
| FULL_SCALE_YUVJ_FORMATS, PIX_FMT_NONE |
| }; |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| static const enum PixelFormat pix_fmts[] = { |
| PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_YUV444P, |
| PIX_FMT_YUV444P, PIX_FMT_YUV410P, PIX_FMT_YUVA420P, |
| PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS, |
| PIX_FMT_NONE |
| }; |
| |
| avfilter_set_common_pixel_formats(ctx, avfilter_make_format_list(pix_fmts)); |
| return 0; |
| } |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) |
| { |
| TInterlaceContext *tinterlace = ctx->priv; |
| int n; |
| tinterlace->mode = 0; |
| |
| if (args) { |
| n = sscanf(args, "%d", &tinterlace->mode); |
| |
| if (n != 1 || tinterlace->mode < 0 || tinterlace->mode > 5) { |
| av_log(ctx, AV_LOG_ERROR, |
| "Invalid mode '%s', use an integer between 0 and 5\n", args); |
| return AVERROR(EINVAL); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| TInterlaceContext *tinterlace = ctx->priv; |
| |
| if (tinterlace->cur ) avfilter_unref_buffer(tinterlace->cur ); |
| if (tinterlace->next) avfilter_unref_buffer(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_descriptors[outlink->format]; |
| TInterlaceContext *tinterlace = ctx->priv; |
| |
| tinterlace->vsub = desc->log2_chroma_h; |
| outlink->w = inlink->w; |
| outlink->h = tinterlace->mode == 0 || tinterlace->mode == 3 ? |
| inlink->h*2 : inlink->h; |
| |
| if (tinterlace->mode == 3) { |
| 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 ? outlink->h >> desc->log2_chroma_h : outlink->h; |
| memset(tinterlace->black_data[i], black[i], |
| tinterlace->black_linesize[i] * h); |
| } |
| } |
| av_log(ctx, AV_LOG_INFO, "mode:%d h:%d -> h:%d\n", |
| tinterlace->mode, 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 field |
| * @param dst_field copy to upper or lower field, |
| * only meaningful when interleave is selected |
| */ |
| static inline |
| void copy_picture_field(uint8_t *dst[4], int dst_linesize[4], |
| uint8_t *src[4], int src_linesize[4], |
| enum PixelFormat format, int w, int src_h, |
| int src_field, int interleave, int dst_field) |
| { |
| const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[format]; |
| int plane, vsub = desc->log2_chroma_h; |
| int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2; |
| |
| for (plane = 0; plane < desc->nb_components; plane++) { |
| int lines = plane == 1 || plane == 2 ? src_h >> vsub : src_h; |
| int linesize = av_image_get_linesize(format, w, plane); |
| uint8_t *dstp = dst[plane]; |
| uint8_t *srcp = src[plane]; |
| lines /= k; |
| if (src_field == FIELD_LOWER) |
| srcp += src_linesize[plane]; |
| if (interleave && dst_field == FIELD_LOWER) |
| dstp += dst_linesize[plane]; |
| av_image_copy_plane(dstp, dst_linesize[plane] * (interleave ? 2 : 1), |
| srcp, src_linesize[plane]*k, linesize, lines); |
| } |
| } |
| |
| static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| TInterlaceContext *tinterlace = ctx->priv; |
| |
| if (tinterlace->cur) |
| avfilter_unref_buffer(tinterlace->cur); |
| tinterlace->cur = tinterlace->next; |
| tinterlace->next = picref; |
| } |
| |
| static void end_frame(AVFilterLink *inlink) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| TInterlaceContext *tinterlace = ctx->priv; |
| AVFilterBufferRef *cur = tinterlace->cur; |
| AVFilterBufferRef *next = tinterlace->next; |
| AVFilterBufferRef *out = NULL; |
| int field, tff; |
| |
| /* we need at least two frames */ |
| if (!tinterlace->cur) |
| return; |
| |
| switch (tinterlace->mode) { |
| case 0: /* 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 = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); |
| avfilter_copy_buffer_ref_props(out, cur); |
| out->video->h = outlink->h; |
| out->video->interlaced = 1; |
| out->video->top_field_first = 1; |
| |
| /* write odd frame lines into the upper field of the new frame */ |
| copy_picture_field(out->data, out->linesize, |
| cur->data, cur->linesize, |
| inlink->format, inlink->w, inlink->h, |
| FIELD_UPPER_AND_LOWER, 1, FIELD_UPPER); |
| /* write even frame lines into the lower field of the new frame */ |
| copy_picture_field(out->data, out->linesize, |
| next->data, next->linesize, |
| inlink->format, inlink->w, inlink->h, |
| FIELD_UPPER_AND_LOWER, 1, FIELD_LOWER); |
| avfilter_unref_buffer(tinterlace->next); |
| tinterlace->next = NULL; |
| break; |
| |
| case 1: /* only output even frames, odd frames are dropped; height unchanged, half framerate */ |
| case 2: /* only output odd frames, even frames are dropped; height unchanged, half framerate */ |
| out = avfilter_ref_buffer(tinterlace->mode == 2 ? cur : next, AV_PERM_READ); |
| avfilter_unref_buffer(tinterlace->next); |
| tinterlace->next = NULL; |
| break; |
| |
| case 3: /* expand each frame to double height, but pad alternate |
| * lines with black; framerate unchanged */ |
| out = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); |
| avfilter_copy_buffer_ref_props(out, cur); |
| out->video->h = outlink->h; |
| |
| field = (1 + tinterlace->frame) & 1 ? FIELD_UPPER : FIELD_LOWER; |
| /* copy upper and lower fields */ |
| copy_picture_field(out->data, out->linesize, |
| cur->data, cur->linesize, |
| inlink->format, inlink->w, inlink->h, |
| FIELD_UPPER_AND_LOWER, 1, field); |
| /* pad with black the other field */ |
| copy_picture_field(out->data, out->linesize, |
| tinterlace->black_data, tinterlace->black_linesize, |
| inlink->format, inlink->w, inlink->h, |
| FIELD_UPPER_AND_LOWER, 1, !field); |
| break; |
| |
| /* interleave upper/lower lines from odd frames with lower/upper lines from even frames, |
| * halving the frame rate and preserving image height */ |
| case 4: /* top field first */ |
| case 5: /* bottom field first */ |
| tff = tinterlace->mode == 4; |
| out = avfilter_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); |
| avfilter_copy_buffer_ref_props(out, cur); |
| out->video->interlaced = 1; |
| out->video->top_field_first = tff; |
| |
| /* copy upper/lower field from cur */ |
| copy_picture_field(out->data, out->linesize, |
| cur->data, cur->linesize, |
| inlink->format, inlink->w, inlink->h, |
| tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER); |
| /* copy lower/upper field from next */ |
| copy_picture_field(out->data, out->linesize, |
| next->data, next->linesize, |
| inlink->format, inlink->w, inlink->h, |
| tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER); |
| avfilter_unref_buffer(tinterlace->next); |
| tinterlace->next = NULL; |
| break; |
| } |
| |
| avfilter_start_frame(outlink, out); |
| avfilter_draw_slice(outlink, 0, outlink->h, 1); |
| avfilter_end_frame(outlink); |
| |
| tinterlace->frame++; |
| } |
| |
| static int poll_frame(AVFilterLink *outlink) |
| { |
| TInterlaceContext *tinterlace = outlink->src->priv; |
| AVFilterLink *inlink = outlink->src->inputs[0]; |
| int ret, val; |
| |
| val = avfilter_poll_frame(inlink); |
| |
| if (val == 1 && !tinterlace->next) { |
| if ((ret = avfilter_request_frame(inlink)) < 0) |
| return ret; |
| val = avfilter_poll_frame(inlink); |
| } |
| assert(tinterlace->next); |
| |
| return val; |
| } |
| |
| static int request_frame(AVFilterLink *outlink) |
| { |
| TInterlaceContext *tinterlace = outlink->src->priv; |
| AVFilterLink *inlink = outlink->src->inputs[0]; |
| |
| do { |
| int ret; |
| |
| if ((ret = avfilter_request_frame(inlink)) < 0) |
| return ret; |
| } while (!tinterlace->cur); |
| |
| return 0; |
| } |
| |
| static void null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { } |
| |
| AVFilter avfilter_vf_tinterlace = { |
| .name = "tinterlace", |
| .description = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."), |
| .priv_size = sizeof(TInterlaceContext), |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| |
| .inputs = (const AVFilterPad[]) { |
| { .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .start_frame = start_frame, |
| .draw_slice = null_draw_slice, |
| .end_frame = end_frame, }, |
| { .name = NULL} |
| }, |
| .outputs = (const AVFilterPad[]) { |
| { .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_out_props, |
| .poll_frame = poll_frame, |
| .request_frame = request_frame }, |
| { .name = NULL} |
| }, |
| }; |