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/*

 * 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 = 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)

{

    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->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->codec->codec_type = AVMEDIA_TYPE_VIDEO;

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

    st->need_parsing = AVSTREAM_PARSE_FULL_RAW;

    st->codec->framerate = s1->framerate;

    st->codec->time_base = av_inv_q(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->codec->codec_type = AVMEDIA_TYPE_DATA;

    st->codec->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, 0, 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_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 | AVFMT_NOTIMESTAMPS,

    .extensions     = "latm",

    .raw_codec_id   = AV_CODEC_ID_AAC_LATM,

};

#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; ibuf_size-2; 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; ibuf_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

#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 | AVFMT_NOTIMESTAMPS,

    .extensions     = "mlp",

    .raw_codec_id   = AV_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 | AVFMT_NOTIMESTAMPS,

    .extensions     = "thd",

    .raw_codec_id   = AV_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|AVFMT_NOTIMESTAMPS,

    .extensions     = "shn",

    .raw_codec_id   = AV_CODEC_ID_SHORTEN,

};

#endif

#if CONFIG_VC1_DEMUXER

FF_DEF_RAWVIDEO_DEMUXER2(vc1, "raw VC-1", NULL, "vc1", AV_CODEC_ID_VC1, AVFMT_GENERIC_INDEX|AVFMT_NOTIMESTAMPS)

#endif