| /* |
| * 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" |
| |
| typedef struct { |
| const AVClass *class; |
| int w, h; |
| char *rate_str; |
| AVRational rate; |
| int buf_idx; |
| AVFilterBufferRef *outpicref; |
| int req_fullfilled; |
| int n; |
| int sample_count_mod; |
| } ShowWavesContext; |
| |
| #define OFFSET(x) offsetof(ShowWavesContext, x) |
| #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM |
| |
| static const AVOption showwaves_options[] = { |
| { "rate", "set video rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, |
| { "r", "set video rate", OFFSET(rate_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS }, |
| { "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 }, |
| { "n", "set how many samples to show in the same point", OFFSET(n), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, FLAGS }, |
| { NULL }, |
| }; |
| |
| AVFILTER_DEFINE_CLASS(showwaves); |
| |
| static av_cold int init(AVFilterContext *ctx, const char *args) |
| { |
| ShowWavesContext *showwaves = ctx->priv; |
| int err; |
| |
| showwaves->class = &showwaves_class; |
| av_opt_set_defaults(showwaves); |
| showwaves->buf_idx = 0; |
| |
| if ((err = av_set_options_string(showwaves, args, "=", ":")) < 0) |
| return err; |
| |
| return 0; |
| } |
| |
| static av_cold void uninit(AVFilterContext *ctx) |
| { |
| ShowWavesContext *showwaves = ctx->priv; |
| |
| av_freep(&showwaves->rate_str); |
| avfilter_unref_bufferp(&showwaves->outpicref); |
| } |
| |
| 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 err; |
| |
| if (showwaves->n && showwaves->rate_str) { |
| av_log(ctx, AV_LOG_ERROR, "Options 'n' and 'rate' cannot be set at the same time\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| if (!showwaves->n) { |
| if (!showwaves->rate_str) |
| showwaves->rate = (AVRational){25,1}; /* set default value */ |
| else if ((err = av_parse_video_rate(&showwaves->rate, showwaves->rate_str)) < 0) { |
| av_log(ctx, AV_LOG_ERROR, "Invalid frame rate: '%s'\n", showwaves->rate_str); |
| return err; |
| } |
| showwaves->n = FFMAX(1, ((double)inlink->sample_rate / (showwaves->w * av_q2d(showwaves->rate))) + 0.5); |
| } |
| |
| 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 void push_frame(AVFilterLink *outlink) |
| { |
| ShowWavesContext *showwaves = outlink->src->priv; |
| |
| ff_filter_frame(outlink, showwaves->outpicref); |
| showwaves->req_fullfilled = 1; |
| showwaves->outpicref = NULL; |
| showwaves->buf_idx = 0; |
| } |
| |
| 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 int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *insamples) |
| { |
| AVFilterContext *ctx = inlink->dst; |
| AVFilterLink *outlink = ctx->outputs[0]; |
| ShowWavesContext *showwaves = ctx->priv; |
| const int nb_samples = insamples->audio->nb_samples; |
| AVFilterBufferRef *outpicref = showwaves->outpicref; |
| int linesize = outpicref ? outpicref->linesize[0] : 0; |
| int16_t *p = (int16_t *)insamples->data[0]; |
| int nb_channels = av_get_channel_layout_nb_channels(insamples->audio->channel_layout); |
| int i, j, h; |
| const int n = showwaves->n; |
| const int x = 255 / (nb_channels * n); /* multiplication factor, pre-computed to avoid in-loop divisions */ |
| |
| /* draw data in the buffer */ |
| for (i = 0; i < nb_samples; i++) { |
| if (!outpicref) { |
| showwaves->outpicref = outpicref = |
| ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_ALIGN, |
| outlink->w, outlink->h); |
| if (!outpicref) |
| return AVERROR(ENOMEM); |
| outpicref->video->w = outlink->w; |
| outpicref->video->h = 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]; |
| memset(outpicref->data[0], 0, showwaves->h*linesize); |
| } |
| for (j = 0; j < nb_channels; j++) { |
| h = showwaves->h/2 - av_rescale(*p++, showwaves->h/2, MAX_INT16); |
| if (h >= 0 && h < outlink->h) |
| *(outpicref->data[0] + showwaves->buf_idx + h * linesize) += 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) |
| push_frame(outlink); |
| } |
| |
| avfilter_unref_buffer(insamples); |
| return 0; |
| } |
| |
| static const AVFilterPad showwaves_inputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .filter_frame = filter_frame, |
| .min_perms = AV_PERM_READ, |
| }, |
| { NULL } |
| }; |
| |
| static const AVFilterPad showwaves_outputs[] = { |
| { |
| .name = "default", |
| .type = AVMEDIA_TYPE_VIDEO, |
| .config_props = config_output, |
| .request_frame = request_frame, |
| }, |
| { NULL } |
| }; |
| |
| AVFilter avfilter_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, |
| }; |