C++ (Cpp) av_float2int Examples

Example #1

File: ircamenc.c Project: r-type/vice-libretro

static int ircam_write_header(AVFormatContext *s)
{
    AVCodecContext *codec = s->streams[0]->codec;
    uint32_t tag;

    if (s->nb_streams != 1) {
        av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
        return AVERROR(EINVAL);
    }

    tag = ff_codec_get_tag(ff_codec_ircam_le_tags, codec->codec_id);
    if (!tag) {
        av_log(s, AV_LOG_ERROR, "unsupported codec\n");
        return AVERROR(EINVAL);
    }

    avio_wl32(s->pb, 0x0001A364);
    avio_wl32(s->pb, av_float2int(codec->sample_rate));
    avio_wl32(s->pb, codec->channels);
    avio_wl32(s->pb, tag);
    ffio_fill(s->pb, 0, 1008);
    return 0;
}

Example #2

File: vf_tonemap.c Project: DeHackEd/FFmpeg

static int filter_frame(AVFilterLink *link, AVFrame *in)
{
    TonemapContext *s = link->dst->priv;
    AVFilterLink *outlink = link->dst->outputs[0];
    AVFrame *out;
    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
    const AVPixFmtDescriptor *odesc = av_pix_fmt_desc_get(outlink->format);
    int ret, x, y;
    double peak = s->peak;

    if (!desc || !odesc) {
        av_frame_free(&in);
        return AVERROR_BUG;
    }

    out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
    if (!out) {
        av_frame_free(&in);
        return AVERROR(ENOMEM);
    }

    ret = av_frame_copy_props(out, in);
    if (ret < 0) {
        av_frame_free(&in);
        av_frame_free(&out);
        return ret;
    }

    /* input and output transfer will be linear */
    if (in->color_trc == AVCOL_TRC_UNSPECIFIED) {
        av_log(s, AV_LOG_WARNING, "Untagged transfer, assuming linear light\n");
        out->color_trc = AVCOL_TRC_LINEAR;
    } else if (in->color_trc != AVCOL_TRC_LINEAR)
        av_log(s, AV_LOG_WARNING, "Tonemapping works on linear light only\n");

    /* read peak from side data if not passed in */
    if (!peak) {
        peak = ff_determine_signal_peak(in);
        av_log(s, AV_LOG_DEBUG, "Computed signal peak: %f\n", peak);
    }

    /* load original color space even if pixel format is RGB to compute overbrights */
    s->coeffs = &luma_coefficients[in->colorspace];
    if (s->desat > 0 && (in->colorspace == AVCOL_SPC_UNSPECIFIED || !s->coeffs)) {
        if (in->colorspace == AVCOL_SPC_UNSPECIFIED)
            av_log(s, AV_LOG_WARNING, "Missing color space information, ");
        else if (!s->coeffs)
            av_log(s, AV_LOG_WARNING, "Unsupported color space '%s', ",
                   av_color_space_name(in->colorspace));
        av_log(s, AV_LOG_WARNING, "desaturation is disabled\n");
        s->desat = 0;
    }

    /* do the tone map */
    for (y = 0; y < out->height; y++)
        for (x = 0; x < out->width; x++)
            tonemap(s, out, in, desc, x, y, peak);

    /* copy/generate alpha if needed */
    if (desc->flags & AV_PIX_FMT_FLAG_ALPHA && odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
        av_image_copy_plane(out->data[3], out->linesize[3],
                            in->data[3], in->linesize[3],
                            out->linesize[3], outlink->h);
    } else if (odesc->flags & AV_PIX_FMT_FLAG_ALPHA) {
        for (y = 0; y < out->height; y++) {
            for (x = 0; x < out->width; x++) {
                AV_WN32(out->data[3] + x * odesc->comp[3].step + y * out->linesize[3],
                        av_float2int(1.0f));
            }
        }
    }

    av_frame_free(&in);

    ff_update_hdr_metadata(out, peak);

    return ff_filter_frame(outlink, out);
}