/*
  * 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,

 };