> From: Eoff, Ullysses A
> +static av_cold int rawdump_init(AVFilterContext *avctx)
> +{
> + RawDumpContext *ctx = avctx->priv;
> + static char *mode = "w";
For the record, this "static" is a problem if multiple rawdump filters are
specified in the graph. The initial reason for this was to open the file for
writing on the first init (to overwrite any pre-existing file), then open for
appending on successive reinit's (e.g. frame resolution changes). Thus,
would need a better solution to achieve the same result without
influencing other instances of the filter.
> +
> + ctx->rawdump_file = fopen(ctx->rawdump_file_str, mode);
> +
> + if (ctx->rawdump_file == NULL) {
> + int err = AVERROR(errno);
> + char buf[128];
> + av_strerror(err, buf, sizeof(buf));
> + av_log(ctx, AV_LOG_ERROR, "Failed to open %s for dumping: %s\n",
> + ctx->rawdump_file_str, buf);
> + return err;
> + }
> +
> + av_log(ctx, AV_LOG_DEBUG, "Opened %s (mode:%s) for dumping.\n",
> + ctx->rawdump_file_str, mode);
> +
> + mode = "a";
> +
> + return 0;
> +}
> +
> +static av_cold void rawdump_uninit(AVFilterContext *avctx)
> +{
> + RawDumpContext *ctx = avctx->priv;
> +
> + if (ctx->rawdump_file != NULL)
> + fclose(ctx->rawdump_file);
> +}
> +
> +#define OFFSET(x) offsetof(RawDumpContext, x)
> +#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
> +static const AVOption rawdump_options[] = {
> + {"file", "Set file where to dump raw frames", OFFSET(rawdump_file_str),
> AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
> + { NULL }
> +};
> +
> +AVFILTER_DEFINE_CLASS(rawdump);
> +
> +static const AVFilterPad rawdump_inputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + .filter_frame = rawdump_filter_frame,
> + },
> + { NULL }
> +};
> +
> +static const AVFilterPad rawdump_outputs[] = {
> + {
> + .name = "default",
> + .type = AVMEDIA_TYPE_VIDEO,
> + },
> + { NULL }
> +};
> +
> +AVFilter ff_vf_rawdump = {
> + .name = "rawdump",
> + .description = NULL_IF_CONFIG_SMALL("Dump frames to file"),
> + .init = rawdump_init,
> + .uninit = rawdump_uninit,
> + .query_formats = rawdump_query_formats,
> + .priv_size = sizeof(RawDumpContext),
> + .priv_class = &rawdump_class,
> + .inputs = rawdump_inputs,
> + .outputs = rawdump_outputs,
> +};
> --
> 2.20.1
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