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/*

 * RAW video demuxer

 * Copyright (c) 2001 Fabrice Bellard

 *

 * 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 "libavutil/parseutils.h"

#include "libavutil/pixdesc.h"

#include "libavutil/opt.h"

#include "internal.h"

#include "avformat.h"

typedef struct RawVideoDemuxerContext {

    const AVClass *class;     /**< Class for private options. */

    int width, height;        /**< Integers describing video size, set by a private option. */

    char *pixel_format;       /**< Set by a private option. */

    AVRational framerate;     /**< AVRational describing framerate, set by a private option. */

} RawVideoDemuxerContext;

static int rawvideo_read_header(AVFormatContext *ctx)

{

    RawVideoDemuxerContext *s = ctx->priv_data;

    enum AVPixelFormat pix_fmt;

    AVStream *st;

    st = avformat_new_stream(ctx, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    st->codec->codec_type = AVMEDIA_TYPE_VIDEO;

    st->codec->codec_id = ctx->iformat->raw_codec_id;

    if ((pix_fmt = av_get_pix_fmt(s->pixel_format)) == AV_PIX_FMT_NONE) {

        av_log(ctx, AV_LOG_ERROR, "No such pixel format: %s.\n",

               s->pixel_format);

        return AVERROR(EINVAL);

    }

    avpriv_set_pts_info(st, 64, s->framerate.den, s->framerate.num);

    st->codec->width  = s->width;

    st->codec->height = s->height;

    st->codec->pix_fmt = pix_fmt;

    st->codec->bit_rate = av_rescale_q(avpicture_get_size(st->codec->pix_fmt, s->width, s->height),

                                       (AVRational){8,1}, st->time_base);

    return 0;

}

static int rawvideo_read_packet(AVFormatContext *s, AVPacket *pkt)

{

    int packet_size, ret, width, height;

    AVStream *st = s->streams[0];

    width = st->codec->width;

    height = st->codec->height;

    packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);

    if (packet_size < 0)

        return -1;

    ret = av_get_packet(s->pb, pkt, packet_size);

    pkt->pts = pkt->dts = pkt->pos / packet_size;

    pkt->stream_index = 0;

    if (ret < 0)

        return ret;

    return 0;

}

#define OFFSET(x) offsetof(RawVideoDemuxerContext, x)

#define DEC AV_OPT_FLAG_DECODING_PARAM

static const AVOption rawvideo_options[] = {

    { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },

    { "pixel_format", "set pixel format", OFFSET(pixel_format), AV_OPT_TYPE_STRING, {.str = "yuv420p"}, 0, 0, DEC },

    { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },

    { NULL },

};

static const AVClass rawvideo_demuxer_class = {

    .class_name = "rawvideo demuxer",

    .item_name  = av_default_item_name,

    .option     = rawvideo_options,

    .version    = LIBAVUTIL_VERSION_INT,

};

AVInputFormat ff_rawvideo_demuxer = {

    .name           = "rawvideo",

    .long_name      = NULL_IF_CONFIG_SMALL("raw video"),

    .priv_data_size = sizeof(RawVideoDemuxerContext),

    .read_header    = rawvideo_read_header,

    .read_packet    = rawvideo_read_packet,

    .flags          = AVFMT_GENERIC_INDEX,

    .extensions     = "yuv,cif,qcif,rgb",

    .raw_codec_id   = AV_CODEC_ID_RAWVIDEO,

    .priv_class     = &rawvideo_demuxer_class,

};