FFmpeg/libavcodec/v4l2_fmt.c

/*
 * V4L2 format helper functions
 *
 * Copyright (C) 2017 Alexis Ballier <aballier@gentoo.org>
 * Copyright (C) 2017 Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>
 *
 * 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 <linux/videodev2.h>
#include <search.h>
#include "v4l2_fmt.h"

#define V4L2_FMT(x) V4L2_PIX_FMT_##x
#define AV_CODEC(x) AV_CODEC_ID_##x
#define AV_FMT(x)   AV_PIX_FMT_##x

static const struct fmt_conversion {
    enum AVPixelFormat avfmt;
    enum AVCodecID avcodec;
    uint32_t v4l2_fmt;
} fmt_map[] = {
    { AV_FMT(RGB555LE),    AV_CODEC(RAWVIDEO),    V4L2_FMT(RGB555) },
    { AV_FMT(RGB555BE),    AV_CODEC(RAWVIDEO),    V4L2_FMT(RGB555X) },
    { AV_FMT(RGB565LE),    AV_CODEC(RAWVIDEO),    V4L2_FMT(RGB565) },
    { AV_FMT(RGB565BE),    AV_CODEC(RAWVIDEO),    V4L2_FMT(RGB565X) },
    { AV_FMT(BGR24),       AV_CODEC(RAWVIDEO),    V4L2_FMT(BGR24) },
    { AV_FMT(RGB24),       AV_CODEC(RAWVIDEO),    V4L2_FMT(RGB24) },
    { AV_FMT(BGR0),        AV_CODEC(RAWVIDEO),    V4L2_FMT(BGR32) },
    { AV_FMT(0RGB),        AV_CODEC(RAWVIDEO),    V4L2_FMT(RGB32) },
    { AV_FMT(GRAY8),       AV_CODEC(RAWVIDEO),    V4L2_FMT(GREY) },
    { AV_FMT(YUV420P),     AV_CODEC(RAWVIDEO),    V4L2_FMT(YUV420) },
    { AV_FMT(YUYV422),     AV_CODEC(RAWVIDEO),    V4L2_FMT(YUYV) },
    { AV_FMT(UYVY422),     AV_CODEC(RAWVIDEO),    V4L2_FMT(UYVY) },
    { AV_FMT(YUV422P),     AV_CODEC(RAWVIDEO),    V4L2_FMT(YUV422P) },
    { AV_FMT(YUV411P),     AV_CODEC(RAWVIDEO),    V4L2_FMT(YUV411P) },
    { AV_FMT(YUV410P),     AV_CODEC(RAWVIDEO),    V4L2_FMT(YUV410) },
    { AV_FMT(YUV410P),     AV_CODEC(RAWVIDEO),    V4L2_FMT(YVU410) },
    { AV_FMT(NV12),        AV_CODEC(RAWVIDEO),    V4L2_FMT(NV12) },
    { AV_FMT(NONE),        AV_CODEC(MJPEG),       V4L2_FMT(MJPEG) },
    { AV_FMT(NONE),        AV_CODEC(MJPEG),       V4L2_FMT(JPEG) },
#ifdef V4L2_PIX_FMT_SRGGB8
    { AV_FMT(BAYER_BGGR8), AV_CODEC(RAWVIDEO),    V4L2_FMT(SBGGR8) },
    { AV_FMT(BAYER_GBRG8), AV_CODEC(RAWVIDEO),    V4L2_FMT(SGBRG8) },
    { AV_FMT(BAYER_GRBG8), AV_CODEC(RAWVIDEO),    V4L2_FMT(SGRBG8) },
    { AV_FMT(BAYER_RGGB8), AV_CODEC(RAWVIDEO),    V4L2_FMT(SRGGB8) },
#endif
#ifdef V4L2_PIX_FMT_Y16
    { AV_FMT(GRAY16LE),    AV_CODEC(RAWVIDEO),    V4L2_FMT(Y16) },
#endif
#ifdef V4L2_PIX_FMT_NV12M
    { AV_FMT(NV12),        AV_CODEC(RAWVIDEO),    V4L2_FMT(NV12M) },
#endif
#ifdef V4L2_PIX_FMT_NV21M
    { AV_FMT(NV21),        AV_CODEC(RAWVIDEO),    V4L2_FMT(NV21M) },
#endif
#ifdef V4L2_PIX_FMT_YUV420M
    { AV_FMT(YUV420P),     AV_CODEC(RAWVIDEO),    V4L2_FMT(YUV420M) },
#endif
#ifdef V4L2_PIX_FMT_NV16M
    { AV_FMT(NV16),        AV_CODEC(RAWVIDEO),    V4L2_FMT(NV16M) },
#endif
#ifdef V4L2_PIX_FMT_H263
    { AV_FMT(NONE),        AV_CODEC(H263),        V4L2_FMT(H263) },
#endif
#ifdef V4L2_PIX_FMT_H264
    { AV_FMT(NONE),        AV_CODEC(H264),        V4L2_FMT(H264) },
#endif
#ifdef V4L2_PIX_FMT_MPEG4
    { AV_FMT(NONE),        AV_CODEC(MPEG4),       V4L2_FMT(MPEG4) },
#endif
#ifdef V4L2_PIX_FMT_CPIA1
    { AV_FMT(NONE),        AV_CODEC(CPIA),        V4L2_FMT(CPIA1) },
#endif
#ifdef V4L2_PIX_FMT_DV
    { AV_FMT(NONE),        AV_CODEC(DVVIDEO),     V4L2_FMT(DV) },
#endif
#ifdef V4L2_PIX_FMT_MPEG1
    { AV_FMT(NONE),        AV_CODEC(MPEG1VIDEO),  V4L2_FMT(MPEG1) },
#endif
#ifdef V4L2_PIX_FMT_MPEG2
    { AV_FMT(NONE),        AV_CODEC(MPEG2VIDEO),  V4L2_FMT(MPEG2) },
#endif
#ifdef V4L2_PIX_FMT_VP8
    { AV_FMT(NONE),        AV_CODEC(VP8),         V4L2_FMT(VP8) },
#endif
#ifdef V4L2_PIX_FMT_VP9
    { AV_FMT(NONE),        AV_CODEC(VP9),         V4L2_FMT(VP9) },
#endif
#ifdef V4L2_PIX_FMT_HEVC
    { AV_FMT(NONE),        AV_CODEC(HEVC),        V4L2_FMT(HEVC) },
#endif
#ifdef V4L2_PIX_FMT_VC1_ANNEX_G
    { AV_FMT(NONE),        AV_CODEC(VC1),         V4L2_FMT(VC1_ANNEX_G) },
#endif
};

static int match_codec(const void *a, const void *b)
{
    if (*(enum AVCodecID *)a == ((struct fmt_conversion *)b)->avcodec)
        return 0;

    return 1;
}

uint32_t ff_v4l2_format_avcodec_to_v4l2(enum AVCodecID avcodec)
{
    size_t len = FF_ARRAY_ELEMS(fmt_map);
    struct fmt_conversion *item;

    item = lfind(&avcodec, fmt_map, &len, sizeof(fmt_map[0]), match_codec);
    if (item)
        return item->v4l2_fmt;

    return 0;
}

static int match_fmt(const void *a, const void *b)
{
    if ( *(enum AVPixelFormat *)a == ((struct fmt_conversion *)b)->avfmt)
        return 0;

    return 1;
}

uint32_t ff_v4l2_format_avfmt_to_v4l2(enum AVPixelFormat avfmt)
{
    size_t len = FF_ARRAY_ELEMS(fmt_map);
    struct fmt_conversion *item;

    item = lfind(&avfmt, fmt_map, &len, sizeof(fmt_map[0]), match_fmt);
    if (item)
        return item->v4l2_fmt;

    return 0;
}

struct v4l2fmt_avcodec_pair {
    enum AVCodecID avcodec;
    uint32_t v4l2_fmt;
};

static int match_codecfmt(const void *a, const void *b)
{
    struct v4l2fmt_avcodec_pair *key = (struct v4l2fmt_avcodec_pair *) a;
    struct fmt_conversion *item = (struct fmt_conversion *) b;

    if (key->avcodec == item->avcodec && key->v4l2_fmt == item->v4l2_fmt)
        return 0;

    return 1;
}

enum AVPixelFormat ff_v4l2_format_v4l2_to_avfmt(uint32_t v4l2_fmt, enum AVCodecID avcodec)
{
    struct v4l2fmt_avcodec_pair const key = {
        .v4l2_fmt = v4l2_fmt,
        .avcodec = avcodec,
    };
    size_t len = FF_ARRAY_ELEMS(fmt_map);
    struct fmt_conversion *item;

    item = lfind(&key, fmt_map, &len, sizeof(fmt_map[0]), match_codecfmt);
    if (item)
        return item->avfmt;

    return AV_PIX_FMT_NONE;
}