avconv_filter.c

/*
 * avconv filter configuration
 *
 * 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 "avconv.h"

#include "libavfilter/avfilter.h"
#include "libavfilter/avfiltergraph.h"

#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/pixdesc.h"
#include "libavutil/pixfmt.h"
#include "libavutil/samplefmt.h"

/**
 * Define a function for building a string containing a list of
 * allowed formats,
 */
#define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
static char *choose_ ## var ## s(OutputStream *ost)                            \
{                                                                              \
    if (ost->st->codec->var != none) {                                         \
        get_name(ost->st->codec->var);                                         \
        return av_strdup(name);                                                \
    } else if (ost->enc->supported_list) {                                     \
        const type *p;                                                         \
        AVIOContext *s = NULL;                                                 \
        uint8_t *ret;                                                          \
        int len;                                                               \
                                                                               \
        if (avio_open_dyn_buf(&s) < 0)                                         \
            exit_program(1);                                                   \
                                                                               \
        for (p = ost->enc->supported_list; *p != none; p++) {                  \
            get_name(*p);                                                      \
            avio_printf(s, "%s" separator, name);                              \
        }                                                                      \
        len = avio_close_dyn_buf(s, &ret);                                     \
        ret[len - 1] = 0;                                                      \
        return ret;                                                            \
    } else                                                                     \
        return NULL;                                                           \
}

DEF_CHOOSE_FORMAT(enum PixelFormat, pix_fmt, pix_fmts, PIX_FMT_NONE,
                  GET_PIX_FMT_NAME, ":")

DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
                  AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")

DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
                  GET_SAMPLE_RATE_NAME, ",")