diff options
Diffstat (limited to 'libavfilter/avf_showwaves.c')
| -rw-r--r-- | libavfilter/avf_showwaves.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/libavfilter/avf_showwaves.c b/libavfilter/avf_showwaves.c new file mode 100644 index 0000000000..30a8e1e62f --- /dev/null +++ b/libavfilter/avf_showwaves.c @@ -0,0 +1,259 @@ +/* + * 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, +}; |