/*
  * Raw v210 video demuxer
  * Copyright (c) 2015 Tiancheng "Timothy" Gu
  *
  * 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/imgutils.h"
 #include "libavutil/parseutils.h"
 #include "libavutil/pixdesc.h"
 #include "libavutil/opt.h"
 #include "internal.h"
 #include "avformat.h"
 
 typedef struct V210DemuxerContext {
     const AVClass *class;     /**< Class for private options. */
     int width, height;        /**< Integers describing video size, set by a private option. */
     AVRational framerate;     /**< AVRational describing framerate, set by a private option. */
 } V210DemuxerContext;
 
 // v210 frame width is padded to multiples of 48
 #define GET_PACKET_SIZE(w, h) (((w + 47) / 48) * 48 * h * 8 / 3)
 
 static int v210_read_header(AVFormatContext *ctx)
 {
     V210DemuxerContext *s = ctx->priv_data;
     AVStream *st;

     int ret;

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

     ret = av_image_check_size(s->width, s->height, 0, ctx);
     if (ret < 0)
         return ret;

     st->codec->width    = s->width;
     st->codec->height   = s->height;
     st->codec->pix_fmt  = ctx->iformat->raw_codec_id == AV_CODEC_ID_V210 ?
                           AV_PIX_FMT_YUV422P10 : AV_PIX_FMT_YUV422P16;

     ctx->packet_size    = GET_PACKET_SIZE(s->width, s->height);
     st->codec->bit_rate = av_rescale_q(ctx->packet_size,

                                        (AVRational){8,1}, st->time_base);
 
     return 0;
 }
 
 
 static int v210_read_packet(AVFormatContext *s, AVPacket *pkt)
 {

     int ret;

     ret = av_get_packet(s->pb, pkt, s->packet_size);
     pkt->pts = pkt->dts = pkt->pos / s->packet_size;

 
     pkt->stream_index = 0;
     if (ret < 0)
         return ret;
     return 0;
 }
 
 #define OFFSET(x) offsetof(V210DemuxerContext, x)
 #define DEC AV_OPT_FLAG_DECODING_PARAM
 static const AVOption v210_options[] = {
     { "video_size", "set frame size", OFFSET(width), AV_OPT_TYPE_IMAGE_SIZE, {.str = NULL}, 0, 0, DEC },
     { "framerate", "set frame rate", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, 0, DEC },
     { NULL },
 };
 
 #if CONFIG_V210_DEMUXER
 static const AVClass v210_demuxer_class = {
     .class_name = "v210 demuxer",
     .item_name  = av_default_item_name,
     .option     = v210_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 AVInputFormat ff_v210_demuxer = {
     .name           = "v210",
     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
     .priv_data_size = sizeof(V210DemuxerContext),
     .read_header    = v210_read_header,
     .read_packet    = v210_read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
     .extensions     = "v210",
     .raw_codec_id   = AV_CODEC_ID_V210,
     .priv_class     = &v210_demuxer_class,
 };
 #endif // CONFIG_V210_DEMUXER
 
 #if CONFIG_V210X_DEMUXER
 static const AVClass v210x_demuxer_class = {
     .class_name = "v210x demuxer",
     .item_name  = av_default_item_name,
     .option     = v210_options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 
 AVInputFormat ff_v210x_demuxer = {
     .name           = "v210x",
     .long_name      = NULL_IF_CONFIG_SMALL("Uncompressed 4:2:2 10-bit"),
     .priv_data_size = sizeof(V210DemuxerContext),
     .read_header    = v210_read_header,
     .read_packet    = v210_read_packet,
     .flags          = AVFMT_GENERIC_INDEX,
     .extensions     = "yuv10",
     .raw_codec_id   = AV_CODEC_ID_V210X,
     .priv_class     = &v210x_demuxer_class,
 };
 #endif // CONFIG_V210X_DEMUXER