/*
  * 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"

 
 /* raw input */
 int ff_raw_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {
     AVStream *st;
     enum CodecID id;
 

     st = avformat_new_stream(s, NULL);

     if (!st)
         return AVERROR(ENOMEM);
 
         id = s->iformat->value;
         if (id == CODEC_ID_RAWVIDEO) {
             st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
         } else {
             st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
         }
         st->codec->codec_id = id;
 
         switch(st->codec->codec_type) {

         case AVMEDIA_TYPE_AUDIO: {
             RawAudioDemuxerContext *s1 = s->priv_data;
 

             st->codec->channels = 1;

             if (id == CODEC_ID_ADPCM_G722)
                 st->codec->sample_rate = 16000;
 
             if (s1 && s1->sample_rate)

                 st->codec->sample_rate = s1->sample_rate;

             if (st->codec->sample_rate <= 0) {

                 av_log(s, AV_LOG_WARNING, "Invalid sample rate %d specified using default of 44100\n",

                        st->codec->sample_rate);

                 st->codec->sample_rate= 44100;

             }
 

             if (s1 && s1->channels)

                 st->codec->channels    = s1->channels;
 

             st->codec->bits_per_coded_sample = av_get_bits_per_sample(st->codec->codec_id);
             assert(st->codec->bits_per_coded_sample > 0);
             st->codec->block_align = st->codec->bits_per_coded_sample*st->codec->channels/8;

             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);

             break;

             }

         case AVMEDIA_TYPE_VIDEO: {
             FFRawVideoDemuxerContext *s1 = s->priv_data;

             int width = 0, height = 0, ret = 0;

             enum PixelFormat pix_fmt;

             AVRational framerate;

 
             if (s1->video_size && (ret = av_parse_video_size(&width, &height, s1->video_size)) < 0) {
                 av_log(s, AV_LOG_ERROR, "Couldn't parse video size.\n");
                 goto fail;
             }
             if ((pix_fmt = av_get_pix_fmt(s1->pixel_format)) == PIX_FMT_NONE) {
                 av_log(s, AV_LOG_ERROR, "No such pixel format: %s.\n", s1->pixel_format);
                 ret = AVERROR(EINVAL);
                 goto fail;

             }

             if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
                 av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
                 goto fail;
             }

             avpriv_set_pts_info(st, 64, framerate.den, framerate.num);

             st->codec->width  = width;
             st->codec->height = height;

             st->codec->pix_fmt = pix_fmt;
 fail:
             return ret;

             }

         default:
             return -1;
         }
     return 0;
 }
 
 #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 = ffio_read_partial(s->pb, pkt->data, size);

     if (ret < 0) {
         av_free_packet(pkt);
         return ret;
     }

     av_shrink_packet(pkt, ret);

     return ret;
 }
 
 int ff_raw_audio_read_header(AVFormatContext *s,
                              AVFormatParameters *ap)
 {

     AVStream *st = avformat_new_stream(s, NULL);

     if (!st)
         return AVERROR(ENOMEM);
     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
     st->codec->codec_id = s->iformat->value;
     st->need_parsing = AVSTREAM_PARSE_FULL;

     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,
                              AVFormatParameters *ap)
 {
     AVStream *st;

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

     st = avformat_new_stream(s, NULL);

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

 
     st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
     st->codec->codec_id = s->iformat->value;
     st->need_parsing = AVSTREAM_PARSE_FULL;
 

     if ((ret = av_parse_video_rate(&framerate, s1->framerate)) < 0) {
         av_log(s, AV_LOG_ERROR, "Could not parse framerate: %s.\n", s1->framerate);
         goto fail;

     }

 
     st->codec->time_base = (AVRational){framerate.den, framerate.num};

     avpriv_set_pts_info(st, 64, 1, 1200000);

 fail:
     return ret;

 }
 
 /* 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_STRING, {.str = "25"}, 0, 0, DEC},

     { NULL },
 };
 

 #if CONFIG_G722_DEMUXER

 AVInputFormat ff_g722_demuxer = {

     .name           = "g722",
     .long_name      = NULL_IF_CONFIG_SMALL("raw G.722"),
     .read_header    = ff_raw_read_header,
     .read_packet    = ff_raw_read_partial_packet,

     .flags= AVFMT_GENERIC_INDEX,
     .extensions = "g722,722",
     .value = CODEC_ID_ADPCM_G722,
 };
 #endif
 

 #if CONFIG_LATM_DEMUXER
 AVInputFormat ff_latm_demuxer = {
     .name           = "latm",
     .long_name      = NULL_IF_CONFIG_SMALL("raw LOAS/LATM"),
     .read_header    = ff_raw_audio_read_header,
     .read_packet    = ff_raw_read_partial_packet,
     .flags= AVFMT_GENERIC_INDEX,
     .extensions = "latm",
     .value = CODEC_ID_AAC_LATM,
 };
 #endif
 

 #if CONFIG_MJPEG_DEMUXER

 FF_DEF_RAWVIDEO_DEMUXER(mjpeg, "raw MJPEG video", NULL, "mjpg,mjpeg,mpo", CODEC_ID_MJPEG)

 #endif
 
 #if CONFIG_MLP_DEMUXER

 AVInputFormat ff_mlp_demuxer = {

     .name           = "mlp",
     .long_name      = NULL_IF_CONFIG_SMALL("raw MLP"),
     .read_header    = ff_raw_audio_read_header,
     .read_packet    = ff_raw_read_partial_packet,

     .flags= AVFMT_GENERIC_INDEX,
     .extensions = "mlp",
     .value = CODEC_ID_MLP,
 };
 #endif
 
 #if CONFIG_TRUEHD_DEMUXER

 AVInputFormat ff_truehd_demuxer = {

     .name           = "truehd",
     .long_name      = NULL_IF_CONFIG_SMALL("raw TrueHD"),
     .read_header    = ff_raw_audio_read_header,
     .read_packet    = ff_raw_read_partial_packet,

     .flags= AVFMT_GENERIC_INDEX,
     .extensions = "thd",
     .value = CODEC_ID_TRUEHD,
 };
 #endif
 
 #if CONFIG_SHORTEN_DEMUXER

 AVInputFormat ff_shorten_demuxer = {

     .name           = "shn",
     .long_name      = NULL_IF_CONFIG_SMALL("raw Shorten"),
     .read_header    = ff_raw_audio_read_header,
     .read_packet    = ff_raw_read_partial_packet,

     .flags          = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,

     .extensions = "shn",
     .value = CODEC_ID_SHORTEN,
 };
 #endif
 
 #if CONFIG_VC1_DEMUXER

 FF_DEF_RAWVIDEO_DEMUXER(vc1, "raw VC-1", NULL, "vc1", CODEC_ID_VC1)

 #endif