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Diffstat (limited to 'libavfilter/vf_histogram.c')
| -rw-r--r-- | libavfilter/vf_histogram.c | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/libavfilter/vf_histogram.c b/libavfilter/vf_histogram.c new file mode 100644 index 0000000..34656b5 --- /dev/null +++ b/libavfilter/vf_histogram.c @@ -0,0 +1,376 @@ +/* + * Copyright (c) 2012-2013 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 + */ + +#include "libavutil/avassert.h" +#include "libavutil/opt.h" +#include "libavutil/parseutils.h" +#include "libavutil/pixdesc.h" +#include "avfilter.h" +#include "formats.h" +#include "internal.h" +#include "video.h" + +enum HistogramMode { + MODE_LEVELS, + MODE_WAVEFORM, + MODE_COLOR, + MODE_COLOR2, + MODE_NB +}; + +typedef struct HistogramContext { + const AVClass *class; ///< AVClass context for log and options purpose + enum HistogramMode mode; + unsigned histogram[256]; + int ncomp; + const uint8_t *bg_color; + const uint8_t *fg_color; + int level_height; + int scale_height; + int step; + int waveform_mode; + int waveform_mirror; + int display_mode; + int levels_mode; + const AVPixFmtDescriptor *desc; +} HistogramContext; + +#define OFFSET(x) offsetof(HistogramContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption histogram_options[] = { + { "mode", "set histogram mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_LEVELS}, 0, MODE_NB-1, FLAGS, "mode"}, + { "levels", "standard histogram", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LEVELS}, 0, 0, FLAGS, "mode" }, + { "waveform", "per row/column luminance graph", 0, AV_OPT_TYPE_CONST, {.i64=MODE_WAVEFORM}, 0, 0, FLAGS, "mode" }, + { "color", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR}, 0, 0, FLAGS, "mode" }, + { "color2", "chroma values in vectorscope", 0, AV_OPT_TYPE_CONST, {.i64=MODE_COLOR2}, 0, 0, FLAGS, "mode" }, + { "level_height", "set level height", OFFSET(level_height), AV_OPT_TYPE_INT, {.i64=200}, 50, 2048, FLAGS}, + { "scale_height", "set scale height", OFFSET(scale_height), AV_OPT_TYPE_INT, {.i64=12}, 0, 40, FLAGS}, + { "step", "set waveform step value", OFFSET(step), AV_OPT_TYPE_INT, {.i64=10}, 1, 255, FLAGS}, + { "waveform_mode", "set waveform mode", OFFSET(waveform_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "waveform_mode"}, + { "row", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "waveform_mode" }, + { "column", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "waveform_mode" }, + { "waveform_mirror", "set waveform mirroring", OFFSET(waveform_mirror), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "waveform_mirror"}, + { "display_mode", "set display mode", OFFSET(display_mode), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "display_mode"}, + { "parade", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "display_mode" }, + { "overlay", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "display_mode" }, + { "levels_mode", "set levels mode", OFFSET(levels_mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "levels_mode"}, + { "linear", NULL, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "levels_mode" }, + { "logarithmic", NULL, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "levels_mode" }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(histogram); + +static const enum AVPixelFormat color_pix_fmts[] = { + AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P, + AV_PIX_FMT_NONE +}; + +static const enum AVPixelFormat levels_pix_fmts[] = { + AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVJ444P, + AV_PIX_FMT_GRAY8, AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_NONE +}; + +static const enum AVPixelFormat waveform_pix_fmts[] = { + AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, + AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, + AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, + AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P, + AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ411P, AV_PIX_FMT_YUVJ420P, + AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, + AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P, + AV_PIX_FMT_GRAY8, + AV_PIX_FMT_NONE +}; + +static int query_formats(AVFilterContext *ctx) +{ + HistogramContext *h = ctx->priv; + const enum AVPixelFormat *pix_fmts; + + switch (h->mode) { + case MODE_WAVEFORM: + pix_fmts = waveform_pix_fmts; + break; + case MODE_LEVELS: + pix_fmts = levels_pix_fmts; + break; + case MODE_COLOR: + case MODE_COLOR2: + pix_fmts = color_pix_fmts; + break; + default: + av_assert0(0); + } + + ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); + + return 0; +} + +static const uint8_t black_yuva_color[4] = { 0, 127, 127, 255 }; +static const uint8_t black_gbrp_color[4] = { 0, 0, 0, 255 }; +static const uint8_t white_yuva_color[4] = { 255, 127, 127, 255 }; +static const uint8_t white_gbrp_color[4] = { 255, 255, 255, 255 }; + +static int config_input(AVFilterLink *inlink) +{ + HistogramContext *h = inlink->dst->priv; + + h->desc = av_pix_fmt_desc_get(inlink->format); + h->ncomp = h->desc->nb_components; + + switch (inlink->format) { + case AV_PIX_FMT_GBRAP: + case AV_PIX_FMT_GBRP: + h->bg_color = black_gbrp_color; + h->fg_color = white_gbrp_color; + break; + default: + h->bg_color = black_yuva_color; + h->fg_color = white_yuva_color; + } + + return 0; +} + +static int config_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + HistogramContext *h = ctx->priv; + + switch (h->mode) { + case MODE_LEVELS: + outlink->w = 256; + outlink->h = (h->level_height + h->scale_height) * FFMAX(h->ncomp * h->display_mode, 1); + break; + case MODE_WAVEFORM: + if (h->waveform_mode) + outlink->h = 256 * FFMAX(h->ncomp * h->display_mode, 1); + else + outlink->w = 256 * FFMAX(h->ncomp * h->display_mode, 1); + break; + case MODE_COLOR: + case MODE_COLOR2: + outlink->h = outlink->w = 256; + break; + default: + av_assert0(0); + } + + outlink->sample_aspect_ratio = (AVRational){1,1}; + + return 0; +} + +static void gen_waveform(HistogramContext *h, AVFrame *inpicref, AVFrame *outpicref, + int component, int intensity, int offset, int col_mode) +{ + const int plane = h->desc->comp[component].plane; + const int mirror = h->waveform_mirror; + const int is_chroma = (component == 1 || component == 2); + const int shift_w = (is_chroma ? h->desc->log2_chroma_w : 0); + const int shift_h = (is_chroma ? h->desc->log2_chroma_h : 0); + const int src_linesize = inpicref->linesize[plane]; + const int dst_linesize = outpicref->linesize[plane]; + const int dst_signed_linesize = dst_linesize * (mirror == 1 ? -1 : 1); + uint8_t *src_data = inpicref->data[plane]; + uint8_t *dst_data = outpicref->data[plane] + (col_mode ? (offset >> shift_h) * dst_linesize : offset >> shift_w); + uint8_t * const dst_bottom_line = dst_data + dst_linesize * ((256 >> shift_h) - 1); + uint8_t * const dst_line = (mirror ? dst_bottom_line : dst_data); + const uint8_t max = 255 - intensity; + const int src_h = FF_CEIL_RSHIFT(inpicref->height, shift_h); + const int src_w = FF_CEIL_RSHIFT(inpicref->width, shift_w); + uint8_t *dst, *p; + int y; + + if (!col_mode && mirror) + dst_data += 256 >> shift_w; + for (y = 0; y < src_h; y++) { + const uint8_t *src_data_end = src_data + src_w; + dst = dst_line; + for (p = src_data; p < src_data_end; p++) { + uint8_t *target; + if (col_mode) { + target = dst++ + dst_signed_linesize * (*p >> shift_h); + } else { + if (mirror) + target = dst_data - (*p >> shift_w); + else + target = dst_data + (*p >> shift_w); + } + if (*target <= max) + *target += intensity; + else + *target = 255; + } + src_data += src_linesize; + dst_data += dst_linesize; + } +} + + +static int filter_frame(AVFilterLink *inlink, AVFrame *in) +{ + HistogramContext *h = inlink->dst->priv; + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = ctx->outputs[0]; + AVFrame *out; + const uint8_t *src; + uint8_t *dst; + int i, j, k, l; + + out = ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) { + av_frame_free(&in); + return AVERROR(ENOMEM); + } + + out->pts = in->pts; + + for (k = 0; k < h->ncomp; k++) { + const int is_chroma = (k == 1 || k == 2); + const int dst_h = FF_CEIL_RSHIFT(outlink->h, (is_chroma ? h->desc->log2_chroma_h : 0)); + const int dst_w = FF_CEIL_RSHIFT(outlink->w, (is_chroma ? h->desc->log2_chroma_w : 0)); + for (i = 0; i < dst_h ; i++) + memset(out->data[h->desc->comp[k].plane] + + i * out->linesize[h->desc->comp[k].plane], + h->bg_color[k], dst_w); + } + + switch (h->mode) { + case MODE_LEVELS: + for (k = 0; k < h->ncomp; k++) { + const int p = h->desc->comp[k].plane; + const int start = k * (h->level_height + h->scale_height) * h->display_mode; + double max_hval_log; + unsigned max_hval = 0; + + for (i = 0; i < in->height; i++) { + src = in->data[p] + i * in->linesize[p]; + for (j = 0; j < in->width; j++) + h->histogram[src[j]]++; + } + + for (i = 0; i < 256; i++) + max_hval = FFMAX(max_hval, h->histogram[i]); + max_hval_log = log2(max_hval + 1); + + for (i = 0; i < outlink->w; i++) { + int col_height; + + if (h->levels_mode) + col_height = round(h->level_height * (1. - (log2(h->histogram[i] + 1) / max_hval_log))); + else + col_height = h->level_height - (h->histogram[i] * (int64_t)h->level_height + max_hval - 1) / max_hval; + + for (j = h->level_height - 1; j >= col_height; j--) { + if (h->display_mode) { + for (l = 0; l < h->ncomp; l++) + out->data[l][(j + start) * out->linesize[l] + i] = h->fg_color[l]; + } else { + out->data[p][(j + start) * out->linesize[p] + i] = 255; + } + } + for (j = h->level_height + h->scale_height - 1; j >= h->level_height; j--) + out->data[p][(j + start) * out->linesize[p] + i] = i; + } + + memset(h->histogram, 0, 256 * sizeof(unsigned)); + } + break; + case MODE_WAVEFORM: + for (k = 0; k < h->ncomp; k++) { + const int offset = k * 256 * h->display_mode; + gen_waveform(h, in, out, k, h->step, offset, h->waveform_mode); + } + break; + case MODE_COLOR: + for (i = 0; i < inlink->h; i++) { + const int iw1 = i * in->linesize[1]; + const int iw2 = i * in->linesize[2]; + for (j = 0; j < inlink->w; j++) { + const int pos = in->data[1][iw1 + j] * out->linesize[0] + in->data[2][iw2 + j]; + if (out->data[0][pos] < 255) + out->data[0][pos]++; + } + } + for (i = 0; i < 256; i++) { + dst = out->data[0] + i * out->linesize[0]; + for (j = 0; j < 256; j++) { + if (!dst[j]) { + out->data[1][i * out->linesize[0] + j] = i; + out->data[2][i * out->linesize[0] + j] = j; + } + } + } + break; + case MODE_COLOR2: + for (i = 0; i < inlink->h; i++) { + const int iw1 = i * in->linesize[1]; + const int iw2 = i * in->linesize[2]; + for (j = 0; j < inlink->w; j++) { + const int u = in->data[1][iw1 + j]; + const int v = in->data[2][iw2 + j]; + const int pos = u * out->linesize[0] + v; + if (!out->data[0][pos]) + out->data[0][pos] = FFABS(128 - u) + FFABS(128 - v); + out->data[1][pos] = u; + out->data[2][pos] = v; + } + } + break; + default: + av_assert0(0); + } + + av_frame_free(&in); + return ff_filter_frame(outlink, out); +} + +static const AVFilterPad inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .filter_frame = filter_frame, + .config_props = config_input, + }, + { NULL } +}; + +static const AVFilterPad outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output, + }, + { NULL } +}; + +AVFilter ff_vf_histogram = { + .name = "histogram", + .description = NULL_IF_CONFIG_SMALL("Compute and draw a histogram."), + .priv_size = sizeof(HistogramContext), + .query_formats = query_formats, + .inputs = inputs, + .outputs = outputs, + .priv_class = &histogram_class, +}; |
