/*
  * RAW demuxers
  * Copyright (c) 2001 Fabrice Bellard
  * Copyright (c) 2005 Alex Beregszaszi
  *
  * 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 "avformat.h"

 #include "internal.h"

 #include "avio_internal.h"

 #include "rawdec.h"

 #include "libavutil/opt.h"

 #include "libavutil/parseutils.h"

 #include "libavutil/pixdesc.h"

 #include "libavutil/avassert.h"

 #include "libavutil/intreadwrite.h"

 
 #define RAW_PACKET_SIZE 1024
 
 int ff_raw_read_partial_packet(AVFormatContext *s, AVPacket *pkt)
 {
     int ret, size;
 
     size = RAW_PACKET_SIZE;
 
     if (av_new_packet(pkt, size) < 0)
         return AVERROR(ENOMEM);
 

     pkt->pos= avio_tell(s->pb);

     pkt->stream_index = 0;

     ret = avio_read_partial(s->pb, pkt->data, size);

     if (ret < 0) {

         av_packet_unref(pkt);

         return ret;
     }

     av_shrink_packet(pkt, ret);

     return ret;
 }
 

 int ff_raw_audio_read_header(AVFormatContext *s)

 {

     AVStream *st = avformat_new_stream(s, NULL);

     if (!st)
         return AVERROR(ENOMEM);

     st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codecpar->codec_id = s->iformat->raw_codec_id;

     st->need_parsing = AVSTREAM_PARSE_FULL_RAW;

     st->start_time = 0;

     /* the parameters will be extracted from the compressed bitstream */
 
     return 0;
 }
 
 /* MPEG-1/H.263 input */

 int ff_raw_video_read_header(AVFormatContext *s)

 {
     AVStream *st;

     FFRawVideoDemuxerContext *s1 = s->priv_data;
     int ret = 0;
 

     st = avformat_new_stream(s, NULL);

     if (!st) {
         ret = AVERROR(ENOMEM);
         goto fail;
     }

     st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codecpar->codec_id = s->iformat->raw_codec_id;

     st->need_parsing = AVSTREAM_PARSE_FULL_RAW;

     st->internal->avctx->framerate = s1->framerate;

     avpriv_set_pts_info(st, 64, 1, 1200000);

 fail:
     return ret;

 }
 

 int ff_raw_data_read_header(AVFormatContext *s)

 {
     AVStream *st = avformat_new_stream(s, NULL);
     if (!st)
         return AVERROR(ENOMEM);

     st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
     st->codecpar->codec_id = s->iformat->raw_codec_id;

     st->start_time = 0;
     return 0;
 }
 

 /* Note: Do not forget to add new entries to the Makefile as well. */
 

 #define OFFSET(x) offsetof(FFRawVideoDemuxerContext, x)
 #define DEC AV_OPT_FLAG_DECODING_PARAM

 const AVOption ff_rawvideo_options[] = {

     { "framerate", "", OFFSET(framerate), AV_OPT_TYPE_VIDEO_RATE, {.str = "25"}, 0, INT_MAX, DEC},

     { NULL },
 };
 

 #if CONFIG_DATA_DEMUXER
 AVInputFormat ff_data_demuxer = {
     .name           = "data",
     .long_name      = NULL_IF_CONFIG_SMALL("raw data"),
     .read_header    = ff_raw_data_read_header,
     .read_packet    = ff_raw_read_partial_packet,
     .raw_codec_id   = AV_CODEC_ID_NONE,

     .flags          = AVFMT_NOTIMESTAMPS,

 };
 #endif
 

 #if CONFIG_MJPEG_DEMUXER

 static int mjpeg_probe(AVProbeData *p)
 {
     int i;
     int state = -1;
     int nb_invalid = 0;
     int nb_frames = 0;
 

     for (i = 0; i < p->buf_size - 1; i++) {

         int c;
         if (p->buf[i] != 0xFF)
             continue;
         c = p->buf[i+1];
         switch (c) {
         case 0xD8:
             state = 0xD8;
             break;
         case 0xC0:
         case 0xC1:
         case 0xC2:
         case 0xC3:
         case 0xC5:
         case 0xC6:
         case 0xC7:
         case 0xF7:
             if (state == 0xD8) {
                 state = 0xC0;
             } else
                 nb_invalid++;
             break;
         case 0xDA:
             if (state == 0xC0) {
                 state = 0xDA;
             } else
                 nb_invalid++;
             break;
         case 0xD9:
             if (state == 0xDA) {
                 state = 0xD9;
                 nb_frames++;
             } else
                 nb_invalid++;
             break;
         default:
             if (  (c >= 0x02 && c <= 0xBF)
                 || c == 0xC8) {
                 nb_invalid++;
             }
         }
     }
 

     if (nb_invalid*4 + 1 < nb_frames) {

         static const char ct_jpeg[] = "\r\nContent-Type: image/jpeg\r\n";

         int i;
 

         for (i=0; i<FFMIN(p->buf_size - (int)sizeof(ct_jpeg), 100); i++)

             if (!memcmp(p->buf + i, ct_jpeg, sizeof(ct_jpeg) - 1))
                 return AVPROBE_SCORE_EXTENSION;
 
         if (nb_invalid == 0 && nb_frames > 2)
             return AVPROBE_SCORE_EXTENSION / 2;

         return AVPROBE_SCORE_EXTENSION / 4;

     }

 
     return 0;
 }
 

 FF_DEF_RAWVIDEO_DEMUXER2(mjpeg, "raw MJPEG video", mjpeg_probe, "mjpg,mjpeg,mpo", AV_CODEC_ID_MJPEG, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)

 #endif