/*

 * R3D REDCODE demuxer

 * Copyright (c) 2008 Baptiste Coudurier <baptiste dot coudurier at gmail dot com>

 *

 * 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/intreadwrite.h"

#include "libavutil/dict.h"

#include "libavutil/mathematics.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

typedef struct R3DContext {

    unsigned video_offsets_count;

    unsigned rdvo_offset;

    int audio_channels;

} R3DContext;

typedef struct Atom {

    unsigned size;

    uint32_t tag;

    uint64_t offset;

} Atom;

static int read_atom(AVFormatContext *s, Atom *atom)

{

    atom->offset = avio_tell(s->pb);

    atom->size = avio_rb32(s->pb);

    if (atom->size < 8)

        return -1;

    atom->tag = avio_rl32(s->pb);

    av_log(s, AV_LOG_TRACE, "atom %u %.4s offset %#"PRIx64"\n",

            atom->size, (char*)&atom->tag, atom->offset);

    return atom->size;

}

static int r3d_read_red1(AVFormatContext *s)

{

    AVStream *st = avformat_new_stream(s, NULL);

    R3DContext *r3d = s->priv_data;

    char filename[258];

    int tmp;

    int ret;

    av_unused int tmp2;

    AVRational framerate;

    if (!st)

        return AVERROR(ENOMEM);

    st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;

    st->codecpar->codec_id = AV_CODEC_ID_JPEG2000;

    tmp  = avio_r8(s->pb); // major version

    tmp2 = avio_r8(s->pb); // minor version

    av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

    tmp = avio_rb16(s->pb); // unknown

    av_log(s, AV_LOG_TRACE, "unknown1 %d\n", tmp);

    tmp = avio_rb32(s->pb);

    avpriv_set_pts_info(st, 32, 1, tmp);

    tmp = avio_rb32(s->pb); // filenum

    av_log(s, AV_LOG_TRACE, "filenum %d\n", tmp);

    avio_skip(s->pb, 32); // unknown

    st->codecpar->width  = avio_rb32(s->pb);

    st->codecpar->height = avio_rb32(s->pb);

    tmp = avio_rb16(s->pb); // unknown

    av_log(s, AV_LOG_TRACE, "unknown2 %d\n", tmp);

    framerate.num = avio_rb16(s->pb);

    framerate.den = avio_rb16(s->pb);

    if (framerate.num > 0 && framerate.den > 0) {

#if FF_API_R_FRAME_RATE

        st->r_frame_rate =

#endif

        st->avg_frame_rate = framerate;

    }

    r3d->audio_channels = avio_r8(s->pb); // audio channels

    av_log(s, AV_LOG_TRACE, "audio channels %d\n", tmp);

    ret = avio_read(s->pb, filename, 257);

    if (ret < 257)

        return ret < 0 ? ret : AVERROR_EOF;

    filename[sizeof(filename)-1] = 0;

    av_dict_set(&st->metadata, "filename", filename, 0);

    av_log(s, AV_LOG_TRACE, "filename %s\n", filename);

    av_log(s, AV_LOG_TRACE, "resolution %dx%d\n", st->codecpar->width, st->codecpar->height);

    av_log(s, AV_LOG_TRACE, "timescale %d\n", st->time_base.den);

    av_log(s, AV_LOG_TRACE, "frame rate %d/%d\n",

            framerate.num, framerate.den);

    return 0;

}

static int r3d_read_rdvo(AVFormatContext *s, Atom *atom)

{

    R3DContext *r3d = s->priv_data;

    AVStream *st = s->streams[0];

    int i;

    r3d->video_offsets_count = (atom->size - 8) / 4;

    for (i = 0; i < r3d->video_offsets_count; i++) {

        unsigned video_offset = avio_rb32(s->pb);

        if (!video_offset) {

            r3d->video_offsets_count = i;

            break;

        }

        av_log(s, AV_LOG_TRACE, "video offset %d: %#x\n", i, video_offset);

    }

    if (st->avg_frame_rate.num)

        st->duration = av_rescale_q(r3d->video_offsets_count,

                                    av_inv_q(st->avg_frame_rate),

                                    st->time_base);

    av_log(s, AV_LOG_TRACE, "duration %"PRId64"\n", st->duration);

    return 0;

}

static void r3d_read_reos(AVFormatContext *s)

{

    R3DContext *r3d = s->priv_data;

    av_unused int tmp;

    r3d->rdvo_offset = avio_rb32(s->pb);

    avio_rb32(s->pb); // rdvs offset

    avio_rb32(s->pb); // rdao offset

    avio_rb32(s->pb); // rdas offset

    tmp = avio_rb32(s->pb);

    av_log(s, AV_LOG_TRACE, "num video chunks %d\n", tmp);

    tmp = avio_rb32(s->pb);

    av_log(s, AV_LOG_TRACE, "num audio chunks %d\n", tmp);

    avio_skip(s->pb, 6*4);

}

static int r3d_read_header(AVFormatContext *s)

{

    FFFormatContext *const si = ffformatcontext(s);

    R3DContext *r3d = s->priv_data;

    Atom atom;

    int ret;

    if (read_atom(s, &atom) < 0) {

        av_log(s, AV_LOG_ERROR, "error reading atom\n");

        return -1;

    }

    if (atom.tag == MKTAG('R','E','D','1')) {

        if ((ret = r3d_read_red1(s)) < 0) {

            av_log(s, AV_LOG_ERROR, "error parsing 'red1' atom\n");

            return ret;

        }

    } else {

        av_log(s, AV_LOG_ERROR, "could not find 'red1' atom\n");

        return -1;

    }

    /* we cannot create the audio stream now because we do not know the

     * sample rate */

    if (r3d->audio_channels)

        s->ctx_flags |= AVFMTCTX_NOHEADER;

    si->data_offset = avio_tell(s->pb);

    av_log(s, AV_LOG_TRACE, "data offset %#"PRIx64"\n", si->data_offset);

    if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))

        return 0;

    // find REOB/REOF/REOS to load index

    avio_seek(s->pb, avio_size(s->pb)-48-8, SEEK_SET);

    if (read_atom(s, &atom) < 0)

        av_log(s, AV_LOG_ERROR, "error reading end atom\n");

    if (atom.tag != MKTAG('R','E','O','B') &&

        atom.tag != MKTAG('R','E','O','F') &&

        atom.tag != MKTAG('R','E','O','S'))

        goto out;

    r3d_read_reos(s);

    if (r3d->rdvo_offset) {

        avio_seek(s->pb, r3d->rdvo_offset, SEEK_SET);

        if (read_atom(s, &atom) < 0)

            av_log(s, AV_LOG_ERROR, "error reading 'rdvo' atom\n");

        if (atom.tag == MKTAG('R','D','V','O')) {

            if (r3d_read_rdvo(s, &atom) < 0)

                av_log(s, AV_LOG_ERROR, "error parsing 'rdvo' atom\n");

        }

    }

 out:

    avio_seek(s->pb, si->data_offset, SEEK_SET);

    return 0;

}

static int r3d_read_redv(AVFormatContext *s, AVPacket *pkt, Atom *atom)

{

    AVStream *st = s->streams[0];

    int tmp;

    av_unused int tmp2;

    int64_t pos = avio_tell(s->pb);

    unsigned dts;

    int ret;

    dts = avio_rb32(s->pb);

    tmp = avio_rb32(s->pb);

    av_log(s, AV_LOG_TRACE, "frame num %d\n", tmp);

    tmp  = avio_r8(s->pb); // major version

    tmp2 = avio_r8(s->pb); // minor version

    av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

    tmp = avio_rb16(s->pb); // unknown

    av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

    if (tmp > 4) {

        tmp = avio_rb16(s->pb); // unknown

        av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

        tmp = avio_rb16(s->pb); // unknown

        av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

        tmp = avio_rb32(s->pb);

        av_log(s, AV_LOG_TRACE, "width %d\n", tmp);

        tmp = avio_rb32(s->pb);

        av_log(s, AV_LOG_TRACE, "height %d\n", tmp);

        tmp = avio_rb32(s->pb);

        av_log(s, AV_LOG_TRACE, "metadata len %d\n", tmp);

    }

    tmp = atom->size - 8 - (avio_tell(s->pb) - pos);

    if (tmp < 0)

        return -1;

    ret = av_get_packet(s->pb, pkt, tmp);

    if (ret < 0) {

        av_log(s, AV_LOG_ERROR, "error reading video packet\n");

        return -1;

    }

    pkt->stream_index = 0;

    pkt->dts = dts;

    if (st->avg_frame_rate.num)

        pkt->duration = (uint64_t)st->time_base.den*

            st->avg_frame_rate.den/st->avg_frame_rate.num;

    av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64"\n", pkt->dts, pkt->duration);

    return 0;

}

static int r3d_read_reda(AVFormatContext *s, AVPacket *pkt, Atom *atom)

{

    R3DContext *r3d = s->priv_data;

    AVStream *st;

    av_unused int tmp, tmp2;

    int samples, size;

    int64_t pos = avio_tell(s->pb);

    unsigned dts;

    int ret;

    if (s->nb_streams < 2) {

        st = avformat_new_stream(s, NULL);

        if (!st)

            return AVERROR(ENOMEM);

        st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;

        st->codecpar->codec_id = AV_CODEC_ID_PCM_S32BE;

        st->codecpar->ch_layout.nb_channels = r3d->audio_channels;

        avpriv_set_pts_info(st, 32, 1, s->streams[0]->time_base.den);

    } else {

        st = s->streams[1];

    }

    dts = avio_rb32(s->pb);

    st->codecpar->sample_rate = avio_rb32(s->pb);

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

        av_log(s, AV_LOG_ERROR, "Bad sample rate\n");

        return AVERROR_INVALIDDATA;

    }

    samples = avio_rb32(s->pb);

    tmp = avio_rb32(s->pb);

    av_log(s, AV_LOG_TRACE, "packet num %d\n", tmp);

    tmp = avio_rb16(s->pb); // unknown

    av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

    tmp  = avio_r8(s->pb); // major version

    tmp2 = avio_r8(s->pb); // minor version

    av_log(s, AV_LOG_TRACE, "version %d.%d\n", tmp, tmp2);

    tmp = avio_rb32(s->pb); // unknown

    av_log(s, AV_LOG_TRACE, "unknown %d\n", tmp);

    size = atom->size - 8 - (avio_tell(s->pb) - pos);

    if (size < 0)

        return -1;

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

    if (ret < 0) {

        av_log(s, AV_LOG_ERROR, "error reading audio packet\n");

        return ret;

    }

    pkt->stream_index = 1;

    pkt->dts = dts;

    if (st->codecpar->sample_rate && samples > 0)

        pkt->duration = av_rescale(samples, st->time_base.den, st->codecpar->sample_rate);

    av_log(s, AV_LOG_TRACE, "pkt dts %"PRId64" duration %"PRId64" samples %d sample rate %d\n",

            pkt->dts, pkt->duration, samples, st->codecpar->sample_rate);

    return 0;

}

static int r3d_read_packet(AVFormatContext *s, AVPacket *pkt)

{

    R3DContext *r3d = s->priv_data;

    Atom atom;

    int err = 0;

    while (!err) {

        if (read_atom(s, &atom) < 0) {

            err = -1;

            break;

        }

        switch (atom.tag) {

        case MKTAG('R','E','D','V'):

            if (s->streams[0]->discard == AVDISCARD_ALL)

                goto skip;

            if (!(err = r3d_read_redv(s, pkt, &atom)))

                return 0;

            break;

        case MKTAG('R','E','D','A'):

            if (!r3d->audio_channels)

                return -1;

            if (s->nb_streams >= 2 && s->streams[1]->discard == AVDISCARD_ALL)

                goto skip;

            if (!(err = r3d_read_reda(s, pkt, &atom)))

                return 0;

            break;

        default:

        skip:

            avio_skip(s->pb, atom.size-8);

        }

    }

    return err;

}

static int r3d_probe(const AVProbeData *p)

{

    if (AV_RL32(p->buf + 4) == MKTAG('R','E','D','1'))

        return AVPROBE_SCORE_MAX;

    return 0;

}

static int r3d_seek(AVFormatContext *s, int stream_index, int64_t sample_time, int flags)

{

    AVStream *st = s->streams[0]; // video stream

    R3DContext *r3d = s->priv_data;

    int frame_num;

    if (!st->avg_frame_rate.num)

        return -1;

    frame_num = av_rescale_q(sample_time, st->time_base,

                             av_inv_q(st->avg_frame_rate));

    av_log(s, AV_LOG_TRACE, "seek frame num %d timestamp %"PRId64"\n",

            frame_num, sample_time);

    if (frame_num < r3d->video_offsets_count) {

        if (avio_seek(s->pb, r3d->video_offsets_count, SEEK_SET) < 0)

            return -1;

    } else {

        av_log(s, AV_LOG_ERROR, "could not seek to frame %d\n", frame_num);

        return -1;

    }

    return 0;

}

const FFInputFormat ff_r3d_demuxer = {

    .p.name         = "r3d",

    .p.long_name    = NULL_IF_CONFIG_SMALL("REDCODE R3D"),

    .priv_data_size = sizeof(R3DContext),

    .read_probe     = r3d_probe,

    .read_header    = r3d_read_header,

    .read_packet    = r3d_read_packet,

    .read_seek      = r3d_seek,

};