diff options
Diffstat (limited to 'libavfilter/vf_tinterlace.c')
| -rw-r--r-- | libavfilter/vf_tinterlace.c | 391 |
1 files changed, 391 insertions, 0 deletions
diff --git a/libavfilter/vf_tinterlace.c b/libavfilter/vf_tinterlace.c new file mode 100644 index 0000000..5b03b81 --- /dev/null +++ b/libavfilter/vf_tinterlace.c @@ -0,0 +1,391 @@ +/* + * 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 "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, +}; + +static const char *tinterlace_mode_str[] = { + "merge", + "drop_even", + "drop_odd", + "pad", + "interleave_top", + "interleave_bottom", + "interlacex2", + NULL +}; + +typedef struct { + enum TInterlaceMode 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 + }; + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + return 0; +} + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + TInterlaceContext *tinterlace = ctx->priv; + int i; + char c; + + tinterlace->mode = MODE_MERGE; + + if (args) { + if (sscanf(args, "%d%c", (int *)&tinterlace->mode, &c) == 1) { + if (tinterlace->mode > 6) { + av_log(ctx, AV_LOG_ERROR, + "Invalid mode '%s', use an integer between 0 and 6\n", args); + return AVERROR(EINVAL); + } + + av_log(ctx, AV_LOG_WARNING, + "Using numeric constant is deprecated, use symbolic values\n"); + } else { + for (i = 0; tinterlace_mode_str[i]; i++) { + if (!strcmp(tinterlace_mode_str[i], args)) { + tinterlace->mode = i; + break; + } + } + if (!tinterlace_mode_str[i]) { + av_log(ctx, AV_LOG_ERROR, "Invalid argument '%s'\n", args); + return AVERROR(EINVAL); + } + } + } + + return 0; +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + TInterlaceContext *tinterlace = ctx->priv; + + if (tinterlace->cur ) avfilter_unref_bufferp(&tinterlace->cur ); + if (tinterlace->next) avfilter_unref_bufferp(&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 == 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 ? 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_VERBOSE, "mode:%s h:%d -> h:%d\n", + tinterlace_mode_str[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 line + * @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 int start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref) +{ + AVFilterContext *ctx = inlink->dst; + TInterlaceContext *tinterlace = ctx->priv; + + avfilter_unref_buffer(tinterlace->cur); + tinterlace->cur = tinterlace->next; + tinterlace->next = picref; + return 0; +} + +static int 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 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, 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_bufferp(&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 = avfilter_ref_buffer(tinterlace->mode == MODE_DROP_EVEN ? cur : next, AV_PERM_READ); + avfilter_unref_bufferp(&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, 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 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, 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_bufferp(&tinterlace->next); + break; + case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */ + /* output current frame first */ + out = avfilter_ref_buffer(cur, ~AV_PERM_WRITE); + out->video->interlaced = 1; + + ff_start_frame(outlink, out); + ff_draw_slice(outlink, 0, outlink->h, 1); + ff_end_frame(outlink); + + /* output mix of current and next frame */ + tff = next->video->top_field_first; + out = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h); + avfilter_copy_buffer_ref_props(out, next); + out->video->interlaced = 1; + + /* write current frame second field lines into the second field of the new frame */ + copy_picture_field(out->data, out->linesize, + cur->data, cur->linesize, + inlink->format, inlink->w, inlink->h, + tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER); + /* write next frame first field lines into the first field of the new frame */ + copy_picture_field(out->data, out->linesize, + next->data, next->linesize, + inlink->format, inlink->w, inlink->h, + tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER); + break; + } + + ff_start_frame(outlink, out); + ff_draw_slice(outlink, 0, outlink->h, 1); + ff_end_frame(outlink); + + tinterlace->frame++; + + return 0; +} + +static int poll_frame(AVFilterLink *outlink) +{ + TInterlaceContext *tinterlace = outlink->src->priv; + AVFilterLink *inlink = outlink->src->inputs[0]; + int ret, val; + + val = ff_poll_frame(inlink); + + if (val == 1 && !tinterlace->next) { + if ((ret = ff_request_frame(inlink)) < 0) + return ret; + val = ff_poll_frame(inlink); + } + av_assert0(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 = ff_request_frame(inlink)) < 0) + return ret; + } while (!tinterlace->cur); + + return 0; +} + +static int null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir) { return 0; } + +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} + }, +}; |
