diff options
Diffstat (limited to 'libavfilter/avf_showwaves.c')
-rw-r--r-- | libavfilter/avf_showwaves.c | 535 |
1 files changed, 535 insertions, 0 deletions
diff --git a/libavfilter/avf_showwaves.c b/libavfilter/avf_showwaves.c new file mode 100644 index 0000000..57a6b2e --- /dev/null +++ b/libavfilter/avf_showwaves.c @@ -0,0 +1,535 @@ +/* + * 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/avassert.h" +#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, +}; + +struct frame_node { + AVFrame *frame; + struct frame_node *next; +}; + +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; + int mode; ///< ShowWavesMode + int split_channels; + void (*draw_sample)(uint8_t *buf, int height, int linesize, + int16_t sample, int16_t *prev_y, int intensity); + + /* single picture */ + int single_pic; + struct frame_node *audio_frames; + struct frame_node *last_frame; + int64_t total_samples; + int64_t *sum; /* abs sum of the samples per channel */ +} 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); + + if (showwaves->single_pic) { + struct frame_node *node = showwaves->audio_frames; + while (node) { + struct frame_node *tmp = node; + + node = node->next; + av_frame_free(&tmp->frame); + av_freep(&tmp); + } + av_freep(&showwaves->sum); + showwaves->last_frame = NULL; + } +} + +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 push_single_pic(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + AVFilterLink *inlink = ctx->inputs[0]; + ShowWavesContext *showwaves = ctx->priv; + int64_t n = 0, max_samples = showwaves->total_samples / outlink->w; + AVFrame *out = showwaves->outpicref; + struct frame_node *node; + const int nb_channels = inlink->channels; + const int x = 255 / (showwaves->split_channels ? 1 : nb_channels); + const int ch_height = showwaves->split_channels ? outlink->h / nb_channels : outlink->h; + const int linesize = out->linesize[0]; + int col = 0; + int64_t *sum = showwaves->sum; + + av_log(ctx, AV_LOG_DEBUG, "Create frame averaging %"PRId64" samples per column\n", max_samples); + + memset(sum, 0, nb_channels); + + for (node = showwaves->audio_frames; node; node = node->next) { + int i; + const AVFrame *frame = node->frame; + const int16_t *p = (const int16_t *)frame->data[0]; + + for (i = 0; i < frame->nb_samples; i++) { + int ch; + + for (ch = 0; ch < nb_channels; ch++) + sum[ch] += abs(p[ch + i*nb_channels]) << 1; + if (n++ == max_samples) { + for (ch = 0; ch < nb_channels; ch++) { + int16_t sample = sum[ch] / max_samples; + uint8_t *buf = out->data[0] + col; + if (showwaves->split_channels) + buf += ch*ch_height*linesize; + av_assert0(col < outlink->w); + showwaves->draw_sample(buf, ch_height, linesize, sample, &showwaves->buf_idy[ch], x); + sum[ch] = 0; + } + col++; + n = 0; + } + } + } + + return push_frame(outlink); +} + + +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) { + if (showwaves->single_pic) + push_single_pic(outlink); + else + push_frame(outlink); + } + + return ret; +} + +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, INT16_MAX); + 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, INT16_MAX); + 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, INT16_MAX); + 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, INT16_MAX); + const int start = (height - h) / 2; + const int end = start + h; + for (k = start; k < end; k++) + buf[k * linesize] += intensity; +} + +static int alloc_out_frame(ShowWavesContext *showwaves, const int16_t *p, + const AVFilterLink *inlink, AVFilterLink *outlink, + const AVFrame *in) +{ + if (!showwaves->outpicref) { + int j; + AVFrame *out = showwaves->outpicref = + ff_get_video_buffer(outlink, outlink->w, outlink->h); + if (!out) + return AVERROR(ENOMEM); + out->width = outlink->w; + out->height = outlink->h; + out->pts = in->pts + av_rescale_q((p - (int16_t *)in->data[0]) / inlink->channels, + av_make_q(1, inlink->sample_rate), + outlink->time_base); + for (j = 0; j < outlink->h; j++) + memset(out->data[0] + j*out->linesize[0], 0, outlink->w); + } + return 0; +} + +static av_cold int init(AVFilterContext *ctx) +{ + ShowWavesContext *showwaves = ctx->priv; + + if (!strcmp(ctx->filter->name, "showwavespic")) { + showwaves->single_pic = 1; + showwaves->mode = MODE_CENTERED_LINE; + } + + 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; +} + +#if CONFIG_SHOWWAVES_FILTER + +static int showwaves_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; + 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++) { + + ret = alloc_out_frame(showwaves, p, inlink, outlink, insamples); + if (ret < 0) + goto end; + outpicref = showwaves->outpicref; + + for (j = 0; j < nb_channels; j++) { + uint8_t *buf = outpicref->data[0] + showwaves->buf_idx; + const int linesize = outpicref->linesize[0]; + 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; + } + +end: + av_frame_free(&insamples); + return ret; +} + +static const AVFilterPad showwaves_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_frame = showwaves_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, +}; + +#endif // CONFIG_SHOWWAVES_FILTER + +#if CONFIG_SHOWWAVESPIC_FILTER + +#define OFFSET(x) offsetof(ShowWavesContext, x) +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM + +static const AVOption showwavespic_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 }, + { "split_channels", "draw channels separately", OFFSET(split_channels), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, FLAGS }, + { NULL } +}; + +AVFILTER_DEFINE_CLASS(showwavespic); + +static int showwavespic_config_input(AVFilterLink *inlink) +{ + AVFilterContext *ctx = inlink->dst; + ShowWavesContext *showwaves = ctx->priv; + + if (showwaves->single_pic) { + showwaves->sum = av_mallocz_array(inlink->channels, sizeof(*showwaves->sum)); + if (!showwaves->sum) + return AVERROR(ENOMEM); + } + + return 0; +} + +static int showwavespic_filter_frame(AVFilterLink *inlink, AVFrame *insamples) +{ + AVFilterContext *ctx = inlink->dst; + AVFilterLink *outlink = ctx->outputs[0]; + ShowWavesContext *showwaves = ctx->priv; + int16_t *p = (int16_t *)insamples->data[0]; + int ret = 0; + + if (showwaves->single_pic) { + struct frame_node *f; + + ret = alloc_out_frame(showwaves, p, inlink, outlink, insamples); + if (ret < 0) + goto end; + + /* queue the audio frame */ + f = av_malloc(sizeof(*f)); + if (!f) { + ret = AVERROR(ENOMEM); + goto end; + } + f->frame = insamples; + f->next = NULL; + if (!showwaves->last_frame) { + showwaves->audio_frames = + showwaves->last_frame = f; + } else { + showwaves->last_frame->next = f; + showwaves->last_frame = f; + } + showwaves->total_samples += insamples->nb_samples; + + return 0; + } + +end: + av_frame_free(&insamples); + return ret; +} + +static const AVFilterPad showwavespic_inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .config_props = showwavespic_config_input, + .filter_frame = showwavespic_filter_frame, + }, + { NULL } +}; + +static const AVFilterPad showwavespic_outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .config_props = config_output, + .request_frame = request_frame, + }, + { NULL } +}; + +AVFilter ff_avf_showwavespic = { + .name = "showwavespic", + .description = NULL_IF_CONFIG_SMALL("Convert input audio to a video output single picture."), + .init = init, + .uninit = uninit, + .query_formats = query_formats, + .priv_size = sizeof(ShowWavesContext), + .inputs = showwavespic_inputs, + .outputs = showwavespic_outputs, + .priv_class = &showwavespic_class, +}; + +#endif // CONFIG_SHOWWAVESPIC_FILTER |