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/*

 * PMP demuxer.

 * Copyright (c) 2011 Reimar Döffinger

 *

 * 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 "avformat.h"

#include "internal.h"

typedef struct {

    int cur_stream;

    int num_streams;

    int audio_packets;

    int current_packet;

    uint32_t *packet_sizes;

    int packet_sizes_alloc;

} PMPContext;

static int pmp_probe(AVProbeData *p) {

    if (AV_RN32(p->buf) == AV_RN32("pmpm") &&

        AV_RL32(p->buf + 4) == 1)

        return AVPROBE_SCORE_MAX;

    return 0;

}

static int pmp_header(AVFormatContext *s)

{

    PMPContext *pmp = s->priv_data;

    AVIOContext *pb = s->pb;

    int tb_num, tb_den;

    uint32_t index_cnt;

    int audio_codec_id = AV_CODEC_ID_NONE;

    int srate, channels;

    unsigned i;

    uint64_t pos;

    int64_t fsize = avio_size(pb);

    AVStream *vst = avformat_new_stream(s, NULL);

    if (!vst)

        return AVERROR(ENOMEM);

    vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;

    avio_skip(pb, 8);

    switch (avio_rl32(pb)) {

    case 0:

        vst->codec->codec_id = AV_CODEC_ID_MPEG4;

        break;

    case 1:

        vst->codec->codec_id = AV_CODEC_ID_H264;

        break;

    default:

        av_log(s, AV_LOG_ERROR, "Unsupported video format\n");

        break;

    }

    index_cnt = avio_rl32(pb);

    vst->codec->width  = avio_rl32(pb);

    vst->codec->height = avio_rl32(pb);

    tb_num = avio_rl32(pb);

    tb_den = avio_rl32(pb);

    avpriv_set_pts_info(vst, 32, tb_num, tb_den);

    vst->nb_frames = index_cnt;

    vst->duration = index_cnt;

    switch (avio_rl32(pb)) {

    case 0:

        audio_codec_id = AV_CODEC_ID_MP3;

        break;

    case 1:

        av_log(s, AV_LOG_ERROR, "AAC not yet correctly supported\n");

        audio_codec_id = AV_CODEC_ID_AAC;

        break;

    default:

        av_log(s, AV_LOG_ERROR, "Unsupported audio format\n");

        break;

    }

    pmp->num_streams = avio_rl16(pb) + 1;

    avio_skip(pb, 10);

    srate = avio_rl32(pb);

    channels = avio_rl32(pb) + 1;

    pos = avio_tell(pb) + 4LL*index_cnt;

    for (i = 0; i < index_cnt; i++) {

        uint32_t size = avio_rl32(pb);

        int flags = size & 1 ? AVINDEX_KEYFRAME : 0;

        if (url_feof(pb)) {

            av_log(s, AV_LOG_FATAL, "Encountered EOF while reading index.\n");

            return AVERROR_INVALIDDATA;

        }

        size >>= 1;

        if (size < 9 + 4*pmp->num_streams) {

            av_log(s, AV_LOG_ERROR, "Packet too small\n");

            return AVERROR_INVALIDDATA;

        }

        av_add_index_entry(vst, pos, i, size, 0, flags);

        pos += size;

        if (fsize > 0 && i == 0 && pos > fsize) {

            av_log(s, AV_LOG_ERROR, "File ends before first packet\n");

            return AVERROR_INVALIDDATA;

        }

    }

    for (i = 1; i < pmp->num_streams; i++) {

        AVStream *ast = avformat_new_stream(s, NULL);

        if (!ast)

            return AVERROR(ENOMEM);

        ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;

        ast->codec->codec_id = audio_codec_id;

        ast->codec->channels = channels;

        ast->codec->sample_rate = srate;

        avpriv_set_pts_info(ast, 32, 1, srate);

    }

    return 0;

}

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

{

    PMPContext *pmp = s->priv_data;

    AVIOContext *pb = s->pb;

    int ret = 0;

    int i;

    if (url_feof(pb))

        return AVERROR_EOF;

    if (pmp->cur_stream == 0) {

        int num_packets;

        pmp->audio_packets = avio_r8(pb);

        if (!pmp->audio_packets) {

            avpriv_request_sample(s, "0 audio packets");

            return AVERROR_PATCHWELCOME;

        }

        num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1;

        avio_skip(pb, 8);

        pmp->current_packet = 0;

        av_fast_malloc(&pmp->packet_sizes,

                       &pmp->packet_sizes_alloc,

                       num_packets * sizeof(*pmp->packet_sizes));

        if (!pmp->packet_sizes_alloc) {

            av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n");

            return AVERROR(ENOMEM);

        }

        for (i = 0; i < num_packets; i++)

            pmp->packet_sizes[i] = avio_rl32(pb);

    }

    ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]);

    if (ret >= 0) {

        ret = 0;

        // FIXME: this is a hack that should be removed once

        // compute_pkt_fields() can handle timestamps properly

        if (pmp->cur_stream == 0)

            pkt->dts = s->streams[0]->cur_dts++;

        pkt->stream_index = pmp->cur_stream;

    }

    if (pmp->current_packet % pmp->audio_packets == 0)

        pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams;

    pmp->current_packet++;

    return ret;

}

static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags)

{

    PMPContext *pmp = s->priv_data;

    pmp->cur_stream = 0;

    // fall back on default seek now

    return -1;

}

static int pmp_close(AVFormatContext *s)

{

    PMPContext *pmp = s->priv_data;

    av_freep(&pmp->packet_sizes);

    return 0;

}

AVInputFormat ff_pmp_demuxer = {

    .name           = "pmp",

    .long_name      = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"),

    .priv_data_size = sizeof(PMPContext),

    .read_probe     = pmp_probe,

    .read_header    = pmp_header,

    .read_packet    = pmp_packet,

    .read_seek      = pmp_seek,

    .read_close     = pmp_close,

};