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Viewing changes to gst-libs/ext/libav/libavfilter/vf_fade.c

  • Committer: Package Import Robot
  • Author(s): Sebastian Dröge
  • Date: 2013-09-24 17:07:00 UTC
  • mfrom: (1.1.17) (7.1.9 experimental)
  • Revision ID: package-import@ubuntu.com-20130924170700-4dg62s3pwl0pdakz
Tags: 1.2.0-1
* New upstream stable release:
  + debian/control:
    - Build depend on GStreamer and gst-plugins-base >= 1.2.0.

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gst-libs/ext/libav/libavfilter/vf_fade.c
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 * based heavily on vf_negate.c by Bobby Bingham
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 */
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#include "libavutil/common.h"
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#include "libavutil/pixdesc.h"
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#include "avfilter.h"
 
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#include "formats.h"
 
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#include "internal.h"
 
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#include "video.h"
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typedef struct {
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    int factor, fade_per_frame;
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    int hsub, vsub, bpp;
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} FadeContext;
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static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 
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static av_cold int init(AVFilterContext *ctx, const char *args)
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{
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    FadeContext *fade = ctx->priv;
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    unsigned int nb_frames;
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    }
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    fade->stop_frame = fade->start_frame + nb_frames;
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    av_log(ctx, AV_LOG_INFO,
 
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    av_log(ctx, AV_LOG_VERBOSE,
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           "type:%s start_frame:%d nb_frames:%d\n",
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           in_out, fade->start_frame, nb_frames);
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    return 0;
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static int query_formats(AVFilterContext *ctx)
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{
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    static const enum PixelFormat pix_fmts[] = {
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        PIX_FMT_YUV444P,  PIX_FMT_YUV422P,  PIX_FMT_YUV420P,
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        PIX_FMT_YUV411P,  PIX_FMT_YUV410P,
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        PIX_FMT_YUVJ444P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ420P,
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        PIX_FMT_YUV440P,  PIX_FMT_YUVJ440P,
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        PIX_FMT_RGB24,    PIX_FMT_BGR24,
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        PIX_FMT_NONE
 
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    static const enum AVPixelFormat pix_fmts[] = {
 
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        AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV420P,
 
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        AV_PIX_FMT_YUV411P,  AV_PIX_FMT_YUV410P,
 
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        AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P,
 
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        AV_PIX_FMT_YUV440P,  AV_PIX_FMT_YUVJ440P,
 
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        AV_PIX_FMT_RGB24,    AV_PIX_FMT_BGR24,
 
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        AV_PIX_FMT_NONE
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    };
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    avfilter_set_common_formats(ctx, avfilter_make_format_list(pix_fmts));
 
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    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
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    return 0;
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}
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static int config_props(AVFilterLink *inlink)
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{
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    FadeContext *fade = inlink->dst->priv;
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    const AVPixFmtDescriptor *pixdesc = &av_pix_fmt_descriptors[inlink->format];
 
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    const AVPixFmtDescriptor *pixdesc = av_pix_fmt_desc_get(inlink->format);
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    fade->hsub = pixdesc->log2_chroma_w;
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    fade->vsub = pixdesc->log2_chroma_h;
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    return 0;
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}
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static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir)
 
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static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *frame)
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{
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    FadeContext *fade = inlink->dst->priv;
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    AVFilterBufferRef *outpic = inlink->cur_buf;
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    uint8_t *p;
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    int i, j, plane;
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    if (fade->factor < UINT16_MAX) {
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        /* luma or rgb plane */
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        for (i = 0; i < h; i++) {
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            p = outpic->data[0] + (y+i) * outpic->linesize[0];
 
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        for (i = 0; i < frame->video->h; i++) {
 
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            p = frame->data[0] + i * frame->linesize[0];
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            for (j = 0; j < inlink->w * fade->bpp; j++) {
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                /* fade->factor is using 16 lower-order bits for decimal
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                 * places. 32768 = 1 << 15, it is an integer representation
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            }
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        }
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        if (outpic->data[1] && outpic->data[2]) {
 
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        if (frame->data[1] && frame->data[2]) {
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            /* chroma planes */
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            for (plane = 1; plane < 3; plane++) {
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                for (i = 0; i < h; i++) {
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                    p = outpic->data[plane] + ((y+i) >> fade->vsub) * outpic->linesize[plane];
 
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                for (i = 0; i < frame->video->h; i++) {
 
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                    p = frame->data[plane] + (i >> fade->vsub) * frame->linesize[plane];
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                    for (j = 0; j < inlink->w >> fade->hsub; j++) {
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                        /* 8421367 = ((128 << 1) + 1) << 15. It is an integer
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                         * representation of 128.5. The .5 is for rounding
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        }
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    }
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    avfilter_draw_slice(inlink->dst->outputs[0], y, h, slice_dir);
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}
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static void end_frame(AVFilterLink *inlink)
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{
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    FadeContext *fade = inlink->dst->priv;
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    avfilter_end_frame(inlink->dst->outputs[0]);
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    if (fade->frame_index >= fade->start_frame &&
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        fade->frame_index <= fade->stop_frame)
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        fade->factor += fade->fade_per_frame;
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    fade->factor = av_clip_uint16(fade->factor);
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    fade->frame_index++;
 
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    return ff_filter_frame(inlink->dst->outputs[0], frame);
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}
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static const AVFilterPad avfilter_vf_fade_inputs[] = {
 
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    {
 
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        .name             = "default",
 
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        .type             = AVMEDIA_TYPE_VIDEO,
 
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        .config_props     = config_props,
 
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        .get_video_buffer = ff_null_get_video_buffer,
 
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        .filter_frame     = filter_frame,
 
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        .min_perms        = AV_PERM_READ | AV_PERM_WRITE,
 
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        .rej_perms        = AV_PERM_PRESERVE,
 
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    },
 
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    { NULL }
 
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};
 
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static const AVFilterPad avfilter_vf_fade_outputs[] = {
 
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    {
 
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        .name = "default",
 
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        .type = AVMEDIA_TYPE_VIDEO,
 
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    },
 
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    { NULL }
 
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};
 
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AVFilter avfilter_vf_fade = {
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    .name          = "fade",
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    .description   = NULL_IF_CONFIG_SMALL("Fade in/out input video"),
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    .priv_size     = sizeof(FadeContext),
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    .query_formats = query_formats,
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    .inputs    = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO,
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                                    .config_props    = config_props,
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                                    .get_video_buffer = avfilter_null_get_video_buffer,
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                                    .start_frame      = avfilter_null_start_frame,
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                                    .draw_slice      = draw_slice,
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                                    .end_frame       = end_frame,
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                                    .min_perms       = AV_PERM_READ | AV_PERM_WRITE,
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                                    .rej_perms       = AV_PERM_PRESERVE, },
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                                  { .name = NULL}},
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    .outputs   = (AVFilterPad[]) {{ .name            = "default",
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                                    .type            = AVMEDIA_TYPE_VIDEO, },
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                                  { .name = NULL}},
 
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    .inputs    = avfilter_vf_fade_inputs,
 
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    .outputs   = avfilter_vf_fade_outputs,
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};