| /* |
| * Copyright (c) 2012 Stefano Sabatini |
| * |
| * 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 |
| * audio to video multimedia filter |
| */ |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/opt.h" |
| #include "libavutil/parseutils.h" |
| #include "avfilter.h" |
| #include "formats.h" |
| #include "audio.h" |
| #include "video.h" |
| #include "internal.h" |
| |
| enum ShowWavesMode { |
| MODE_POINT, |
| MODE_LINE, |
| MODE_P2P, |
| MODE_CENTERED_LINE, |
| MODE_NB, |
| }; |
| |
| typedef struct { |
| const AVClass *class; |
| int w, h; |
| AVRational rate; |
| int buf_idx; |
| int16_t *buf_idy; /* y coordinate of previous sample for each channel */ |
| AVFrame *outpicref; |
| int req_fullfilled; |
| int n; |
| int sample_count_mod; |
| enum ShowWavesMode mode; |
| int split_channels; |
| void (*draw_sample)(uint8_t *buf, int height, int linesize, |
| int16_t sample, int16_t *prev_y, int intensity); |
| } ShowWavesContext; |
| |
| #define OFFSET(x) offsetof(ShowWavesContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption showwaves_options[] = { |
| { "size", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS }, |
| { "s", "set video size", OFFSET(w), AV_OPT_TYPE_IMAGE_SIZE, {.str = "600x240"}, 0, 0, FLAGS }, |
| { "mode", "select display mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_POINT}, 0, MODE_NB-1, FLAGS, "mode"}, |
| { "point", "draw a point for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_POINT}, .flags=FLAGS, .unit="mode"}, |
| { "line", "draw a line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_LINE}, .flags=FLAGS, .unit="mode"}, |
| { "p2p", "draw a line between samples", 0, AV_OPT_TYPE_CONST, {.i64=MODE_P2P}, .flags=FLAGS, .unit="mode"}, |
| { "cline", "draw a centered line for each sample", 0, AV_OPT_TYPE_CONST, {.i64=MODE_CENTERED_LINE}, .flags=FLAGS, .unit="mode"}, |
| { "n", "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS }, |
| { "rate", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS }, |
| { "r", "set video rate", OFFSET(rate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, FLAGS }, |
| { "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS }, |
| { NULL } |
| }; |
| |
| AVFILTER_DEFINE_CLASS(showwaves); |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| ShowWavesContext *showwaves = ctx->priv; |
| |
| av_frame_free(&showwaves->outpicref); |
| av_freep(&showwaves->buf_idy); |
| } |
| |
| static int query_formats(AVFilterContext *ctx) |
| { |
| AVFilterFormats *formats = NULL; |
| AVFilterChannelLayouts *layouts = NULL; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| static const enum AVSampleFormat sample_fmts[] = { AV_SAMPLE_FMT_S16, AV_SAMPLE_FMT_NONE }; |
| static const enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE }; |
| |
| /* set input audio formats */ |
| formats = ff_make_format_list(sample_fmts); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ff_formats_ref(formats, &inlink->out_formats); |
| |
| layouts = ff_all_channel_layouts(); |
| if (!layouts) |
| return AVERROR(ENOMEM); |
| ff_channel_layouts_ref(layouts, &inlink->out_channel_layouts); |
| |
| formats = ff_all_samplerates(); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ff_formats_ref(formats, &inlink->out_samplerates); |
| |
| /* set output video format */ |
| formats = ff_make_format_list(pix_fmts); |
| if (!formats) |
| return AVERROR(ENOMEM); |
| ff_formats_ref(formats, &outlink->in_formats); |
| |
| return 0; |
| } |
| |
| static int config_output(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| ShowWavesContext *showwaves = ctx->priv; |
| int nb_channels = inlink->channels; |
| |
| if (!showwaves->n) |
| showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5); |
| |
| showwaves->buf_idx = 0; |
| if (!(showwaves->buf_idy = av_mallocz_array(nb_channels, sizeof(*showwaves->buf_idy)))) { |
| av_log(ctx, AV_LOG_ERROR, "Could not allocate showwaves buffer\n"); |
| return AVERROR(ENOMEM); |
| } |
| outlink->w = showwaves->w; |
| outlink->h = showwaves->h; |
| outlink->sample_aspect_ratio = (AVRational){1,1}; |
| |
| outlink->frame_rate = av_div_q((AVRational){inlink->sample_rate,showwaves->n}, |
| (AVRational){showwaves->w,1}); |
| |
| av_log(ctx, AV_LOG_VERBOSE, "s:%dx%d r:%f n:%d\n", |
| showwaves->w, showwaves->h, av_q2d(outlink->frame_rate), showwaves->n); |
| return 0; |
| } |
| |
| inline static int push_frame(AVFilterLink *outlink) |
| { |
| AVFilterContext *ctx = outlink->src; |
| AVFilterLink *inlink = ctx->inputs[0]; |
| ShowWavesContext *showwaves = outlink->src->priv; |
| int nb_channels = inlink->channels; |
| int ret, i; |
| |
| if ((ret = ff_filter_frame(outlink, showwaves->outpicref)) >= 0) |
| showwaves->req_fullfilled = 1; |
| showwaves->outpicref = NULL; |
| showwaves->buf_idx = 0; |
| for (i = 0; i < nb_channels; i++) |
| showwaves->buf_idy[i] = 0; |
| return ret; |
| } |
| |
| static int request_frame(AVFilterLink *outlink) |
| { |
| ShowWavesContext *showwaves = outlink->src->priv; |
| AVFilterLink *inlink = outlink->src->inputs[0]; |
| int ret; |
| |
| showwaves->req_fullfilled = 0; |
| do { |
| ret = ff_request_frame(inlink); |
| } while (!showwaves->req_fullfilled && ret >= 0); |
| |
| if (ret == AVERROR_EOF && showwaves->outpicref) |
| push_frame(outlink); |
| return ret; |
| } |
| |
| #define MAX_INT16 ((1<<15) -1) |
| |
| static void draw_sample_point(uint8_t *buf, int height, int linesize, |
| int16_t sample, int16_t *prev_y, int intensity) |
| { |
| const int h = height/2 - av_rescale(sample, height/2, MAX_INT16); |
| if (h >= 0 && h < height) |
| buf[h * linesize] += intensity; |
| } |
| |
| static void draw_sample_line(uint8_t *buf, int height, int linesize, |
| int16_t sample, int16_t *prev_y, int intensity) |
| { |
| int k; |
| const int h = height/2 - av_rescale(sample, height/2, MAX_INT16); |
| int start = height/2; |
| int end = av_clip(h, 0, height-1); |
| if (start > end) |
| FFSWAP(int16_t, start, end); |
| for (k = start; k < end; k++) |
| buf[k * linesize] += intensity; |
| } |
| |
| static void draw_sample_p2p(uint8_t *buf, int height, int linesize, |
| int16_t sample, int16_t *prev_y, int intensity) |
| { |
| int k; |
| const int h = height/2 - av_rescale(sample, height/2, MAX_INT16); |
| if (h >= 0 && h < height) { |
| buf[h * linesize] += intensity; |
| if (*prev_y && h != *prev_y) { |
| int start = *prev_y; |
| int end = av_clip(h, 0, height-1); |
| if (start > end) |
| FFSWAP(int16_t, start, end); |
| for (k = start + 1; k < end; k++) |
| buf[k * linesize] += intensity; |
| } |
| } |
| *prev_y = h; |
| } |
| |
| static void draw_sample_cline(uint8_t *buf, int height, int linesize, |
| int16_t sample, int16_t *prev_y, int intensity) |
| { |
| int k; |
| const int h = av_rescale(abs(sample), height, UINT16_MAX); |
| const int start = (height - h) / 2; |
| const int end = start + h; |
| for (k = start; k < end; k++) |
| buf[k * linesize] += intensity; |
| } |
| |
| static int filter_frame(AVFilterLink *inlink, AVFrame *insamples) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ShowWavesContext *showwaves = ctx->priv; |
| const int nb_samples = insamples->nb_samples; |
| AVFrame *outpicref = showwaves->outpicref; |
| int linesize = outpicref ? outpicref->linesize[0] : 0; |
| int16_t *p = (int16_t *)insamples->data[0]; |
| int nb_channels = inlink->channels; |
| int i, j, ret = 0; |
| const int n = showwaves->n; |
| const int x = 255 / ((showwaves->split_channels ? 1 : nb_channels) * n); /* multiplication factor, pre-computed to avoid in-loop divisions */ |
| const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h; |
| |
| /* draw data in the buffer */ |
| for (i = 0; i < nb_samples; i++) { |
| if (!showwaves->outpicref) { |
| showwaves->outpicref = outpicref = |
| ff_get_video_buffer(outlink, outlink->w, outlink->h); |
| if (!outpicref) |
| return AVERROR(ENOMEM); |
| outpicref->width = outlink->w; |
| outpicref->height = outlink->h; |
| outpicref->pts = insamples->pts + |
| av_rescale_q((p - (int16_t *)insamples->data[0]) / nb_channels, |
| (AVRational){ 1, inlink->sample_rate }, |
| outlink->time_base); |
| linesize = outpicref->linesize[0]; |
| for (j = 0; j < outlink->h; j++) |
| memset(outpicref->data[0] + j * linesize, 0, outlink->w); |
| } |
| for (j = 0; j < nb_channels; j++) { |
| uint8_t *buf = outpicref->data[0] + showwaves->buf_idx; |
| if (showwaves->split_channels) |
| buf += j*ch_height*linesize; |
| showwaves->draw_sample(buf, ch_height, linesize, *p++, |
| &showwaves->buf_idy[j], x); |
| } |
| |
| showwaves->sample_count_mod++; |
| if (showwaves->sample_count_mod == n) { |
| showwaves->sample_count_mod = 0; |
| showwaves->buf_idx++; |
| } |
| if (showwaves->buf_idx == showwaves->w) |
| if ((ret = push_frame(outlink)) < 0) |
| break; |
| outpicref = showwaves->outpicref; |
| } |
| |
| av_frame_free(&insamples); |
| return ret; |
| } |
| |
| static av_cold int init(AVFilterContext *ctx) |
| { |
| ShowWavesContext *showwaves = ctx->priv; |
| |
| switch (showwaves->mode) { |
| case MODE_POINT: showwaves->draw_sample = draw_sample_point; break; |
| case MODE_LINE: showwaves->draw_sample = draw_sample_line; break; |
| case MODE_P2P: showwaves->draw_sample = draw_sample_p2p; break; |
| case MODE_CENTERED_LINE: showwaves->draw_sample = draw_sample_cline; break; |
| default: |
| return AVERROR_BUG; |
| } |
| return 0; |
| } |
| |
| static const AVFilterPad showwaves_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad showwaves_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| .request_frame = request_frame, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter ff_avf_showwaves = { |
| .name = "showwaves", |
| .description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output."), |
| .init = init, |
| .uninit = uninit, |
| .query_formats = query_formats, |
| .priv_size = sizeof(ShowWavesContext), |
| .inputs = showwaves_inputs, |
| .outputs = showwaves_outputs, |
| .priv_class = &showwaves_class, |
| }; |