On 11/4/2015 3:19 PM, Kyle Swanson wrote:
> Signed-off-by: Kyle Swanson <k...@ylo.ph>
> diff --git a/libavfilter/asrc_anoisesrc.c b/libavfilter/asrc_anoisesrc.c
> new file mode 100644
> index 0000000..d008d67
> --- /dev/null
> +++ b/libavfilter/asrc_anoisesrc.c
> @@ -0,0 +1,222 @@
> +/*
> + * Copyright (c) 2015 Kyle Swanson <k...@ylo.ph>.
> + *
> + * 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
> + */
> +
> +#include <float.h>
> +
> +#include "libavutil/opt.h"
> +#include "audio.h"
> +#include "avfilter.h"
> +#include "internal.h"
> +#include "libavutil/lfg.h"
> +
> +typedef struct {
> + const AVClass *class;
> + int sample_rate;
> + double amplitude;
> + int64_t dur;
> + char *color;
> + int seed;
uint32_t.
Also, why not use av_get_random_seed() when no seed is specified?
In that case both this and the AVOptions below should be int64_t, and the
range of values -1 to UINT32_MAX, with -1 as default.
See f_perms.c
> +
> + int infinite;
> + double (*filter)(double white, double *buf);
> + double* buf;
> + int buf_size;
> + AVLFG c;
> +} ANoiseSrcContext;
> +
> +#define OFFSET(x) offsetof(ANoiseSrcContext, x)
> +#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
> +
> +static const AVOption anoisesrc_options[] = {
> + { "sample_rate", "set sample rate", OFFSET(sample_rate),
> AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS },
> + { "r", "set sample rate", OFFSET(sample_rate),
> AV_OPT_TYPE_INT, {.i64 = 48000}, 15, INT_MAX, FLAGS },
> + { "amplitude", "set amplitude", OFFSET(amplitude),
> AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS },
> + { "a", "set amplitude", OFFSET(amplitude),
> AV_OPT_TYPE_DOUBLE, {.dbl = 1.}, 0., 1., FLAGS },
> + { "duration", "set duration", OFFSET(dur),
> AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
> + { "d", "set duration", OFFSET(dur),
> AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, FLAGS },
> + { "color", "set noise color", OFFSET(color),
> AV_OPT_TYPE_STRING, {.str = "white"}, CHAR_MIN, CHAR_MAX, FLAGS },
> + { "colour", "set noise color", OFFSET(color),
> AV_OPT_TYPE_STRING, {.str = "white"}, CHAR_MIN, CHAR_MAX, FLAGS },
> + { "c", "set noise color", OFFSET(color),
> AV_OPT_TYPE_STRING, {.str = "white"}, CHAR_MIN, CHAR_MAX, FLAGS },
> + { "seed", "set random seed", OFFSET(seed),
> AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, FLAGS },
> + { "s", "set random seed", OFFSET(seed),
> AV_OPT_TYPE_INT, {.i64 = 0}, 0, UINT_MAX, FLAGS },
> + {NULL}
> +};
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