FFmpeg/libavformat/options.c

/*
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
#include "avformat.h"
#include "libavutil/opt.h"

/**
 * @file
 * Options definition for AVFormatContext.
 */

static const char* format_to_name(void* ptr)
{
    AVFormatContext* fc = (AVFormatContext*) ptr;
    if(fc->iformat) return fc->iformat->name;
    else if(fc->oformat) return fc->oformat->name;
    else return "NULL";
}

static const AVOption *opt_find(void *obj, const char *name, const char *unit, int opt_flags, int search_flags)
{
    AVFormatContext   *s = obj;
    AVInputFormat  *ifmt = NULL;
    AVOutputFormat *ofmt = NULL;
    if (s->priv_data) {
        if ((s->iformat && !s->iformat->priv_class) ||
            (s->oformat && !s->oformat->priv_class))
            return NULL;
        return av_opt_find(s->priv_data, name, unit, opt_flags, search_flags);
    }

    while ((ifmt = av_iformat_next(ifmt))) {
        const AVOption *o;

        if (ifmt->priv_class && (o = av_opt_find(&ifmt->priv_class, name, unit, opt_flags, search_flags)))
            return o;
    }
    while ((ofmt = av_oformat_next(ofmt))) {
        const AVOption *o;

        if (ofmt->priv_class && (o = av_opt_find(&ofmt->priv_class, name, unit, opt_flags, search_flags)))
            return o;
    }
    return NULL;
}

#define OFFSET(x) offsetof(AVFormatContext,x)
#define DEFAULT 0 //should be NAN but it does not work as it is not a constant in glibc as required by ANSI/ISO C
//these names are too long to be readable
#define E AV_OPT_FLAG_ENCODING_PARAM
#define D AV_OPT_FLAG_DECODING_PARAM

static const AVOption options[]={
{"probesize", "set probing size", OFFSET(probesize), FF_OPT_TYPE_INT, {.dbl = 5000000 }, 32, INT_MAX, D},
{"muxrate", "set mux rate", OFFSET(mux_rate), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E},
{"packetsize", "set packet size", OFFSET(packet_size), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E},
{"fflags", NULL, OFFSET(flags), FF_OPT_TYPE_FLAGS, {.dbl = DEFAULT }, INT_MIN, INT_MAX, D|E, "fflags"},
{"ignidx", "ignore index", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNIDX }, INT_MIN, INT_MAX, D, "fflags"},
{"genpts", "generate pts", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_GENPTS }, INT_MIN, INT_MAX, D, "fflags"},
{"nofillin", "do not fill in missing values that can be exactly calculated", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOFILLIN }, INT_MIN, INT_MAX, D, "fflags"},
{"noparse", "disable AVParsers, this needs nofillin too", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_NOPARSE }, INT_MIN, INT_MAX, D, "fflags"},
{"igndts", "ignore dts", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_IGNDTS }, INT_MIN, INT_MAX, D, "fflags"},
#if FF_API_FLAG_RTP_HINT
{"rtphint", "add rtp hinting (deprecated, use the -movflags rtphint option instead)", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_RTP_HINT }, INT_MIN, INT_MAX, E, "fflags"},
#endif
{"discardcorrupt", "discard corrupted frames", 0, FF_OPT_TYPE_CONST, {.dbl = AVFMT_FLAG_DISCARD_CORRUPT }, INT_MIN, INT_MAX, D, "fflags"},
{"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, {.dbl = 5*AV_TIME_BASE }, 0, INT_MAX, D},
{"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, {.dbl = 0}, 0, 0, D},
{"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, {.dbl = 1<<20 }, 0, INT_MAX, D},
{"rtbufsize", "max memory used for buffering real-time frames", OFFSET(max_picture_buffer), FF_OPT_TYPE_INT, {.dbl = 3041280 }, 0, INT_MAX, D}, /* defaults to 1s of 15fps 352x288 YUYV422 video */
{"fdebug", "print specific debug info", OFFSET(debug), FF_OPT_TYPE_FLAGS, {.dbl = DEFAULT }, 0, INT_MAX, E|D, "fdebug"},
{"ts", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_FDEBUG_TS }, INT_MIN, INT_MAX, E|D, "fdebug"},
{"max_delay", "maximum muxing or demuxing delay in microseconds", OFFSET(max_delay), FF_OPT_TYPE_INT, {.dbl = DEFAULT }, 0, INT_MAX, E|D},
{"fer", "set error detection aggressivity", OFFSET(error_recognition), FF_OPT_TYPE_INT, {.dbl = FF_ER_CAREFUL }, INT_MIN, INT_MAX, D, "fer"},
{"careful", NULL, 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_CAREFUL }, INT_MIN, INT_MAX, D, "fer"},
{"explode", "abort decoding on error recognition", 0, FF_OPT_TYPE_CONST, {.dbl = FF_ER_EXPLODE }, INT_MIN, INT_MAX, D, "fer"},
{"fpsprobesize", "number of frames used to probe fps", OFFSET(fps_probe_size), FF_OPT_TYPE_INT, {.dbl = -1}, -1, INT_MAX-1, D},
{NULL},
};

#undef E
#undef D
#undef DEFAULT

static const AVClass av_format_context_class = {
    .class_name     = "AVFormatContext",
    .item_name      = format_to_name,
    .option         = options,
    .version        = LIBAVUTIL_VERSION_INT,
    .opt_find       = opt_find,
};

static void avformat_get_context_defaults(AVFormatContext *s)
{
    memset(s, 0, sizeof(AVFormatContext));

    s->av_class = &av_format_context_class;

    av_opt_set_defaults(s);
}

AVFormatContext *avformat_alloc_context(void)
{
    AVFormatContext *ic;
    ic = av_malloc(sizeof(AVFormatContext));
    if (!ic) return ic;
    avformat_get_context_defaults(ic);
    return ic;
}