[FFmpeg-devel] [PATCH] avfilter: add anoisesrc

[Kyle Swanson]

On Wed, Nov 4, 2015 at 1:10 PM, James Almer <jamrial at gmail.com> wrote:
> On 11/4/2015 3:19 PM, Kyle Swanson wrote:
>> Signed-off-by: Kyle Swanson <k at 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 at 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

Good idea. I'll add this.

>> +
>> +    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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