/*

 * AIFF/AIFF-C demuxer

 * Copyright (c) 2006  Patrick Guimond

 *

 * 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/mem.h"

#include "avformat.h"

#include "demux.h"

#include "internal.h"

#include "pcm.h"

#include "aiff.h"

#include "id3v2.h"

#include "mov_chan.h"

#include "replaygain.h"

#define AIFF                    0

#define AIFF_C_VERSION1         0xA2805140

typedef struct AIFFInputContext {

    int64_t data_end;

    int block_duration;

} AIFFInputContext;

static enum AVCodecID aiff_codec_get_id(int bps)

{

    if (bps <= 8)

        return AV_CODEC_ID_PCM_S8;

    if (bps <= 16)

        return AV_CODEC_ID_PCM_S16BE;

    if (bps <= 24)

        return AV_CODEC_ID_PCM_S24BE;

    if (bps <= 32)

        return AV_CODEC_ID_PCM_S32BE;

    /* bigger than 32 isn't allowed  */

    return AV_CODEC_ID_NONE;

}

/* returns the size of the found tag */

static int64_t get_tag(AVIOContext *pb, uint32_t * tag)

{

    int64_t size;

    if (avio_feof(pb))

        return AVERROR_INVALIDDATA;

    *tag = avio_rl32(pb);

    size = avio_rb32(pb);

    return size;

}

/* Metadata string read */

static void get_meta(AVFormatContext *s, const char *key, int64_t size)

{

    uint8_t *str = NULL;

    if (size < SIZE_MAX)

        str = av_malloc(size+1);

    if (str) {

        int res = avio_read(s->pb, str, size);

        if (res < 0){

            av_free(str);

            return;

        }

        size -= res;

        str[res] = 0;

        av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);

    }

    avio_skip(s->pb, size);

}

/* Returns the number of sound data frames or negative on error */

static int get_aiff_header(AVFormatContext *s, int64_t size,

                                    unsigned version)

{

    AVIOContext *pb        = s->pb;

    AVCodecParameters *par = s->streams[0]->codecpar;

    AIFFInputContext *aiff = s->priv_data;

    int exp;

    uint64_t val;

    int sample_rate;

    unsigned int num_frames;

    int channels;

    if (size & 1)

        size++;

    par->codec_type = AVMEDIA_TYPE_AUDIO;

    channels = avio_rb16(pb);

    if (par->ch_layout.nb_channels && par->ch_layout.nb_channels != channels)

        return AVERROR_INVALIDDATA;

    par->ch_layout.nb_channels = channels;

    num_frames = avio_rb32(pb);

    par->bits_per_coded_sample = avio_rb16(pb);

    exp = avio_rb16(pb) - 16383 - 63;

    val = avio_rb64(pb);

    if (exp <-63 || exp >63) {

        av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);

        return AVERROR_INVALIDDATA;

    }

    if (exp >= 0)

        sample_rate = val << exp;

    else

        sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;

    if (sample_rate <= 0)

        return AVERROR_INVALIDDATA;

    par->sample_rate = sample_rate;

    if (size < 18)

        return AVERROR_INVALIDDATA;

    size -= 18;

    /* get codec id for AIFF-C */

    if (size < 4) {

        version = AIFF;

    } else if (version == AIFF_C_VERSION1) {

        par->codec_tag = avio_rl32(pb);

        par->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, par->codec_tag);

        if (par->codec_id == AV_CODEC_ID_NONE)

            avpriv_request_sample(s, "unknown or unsupported codec tag: %s",

                                  av_fourcc2str(par->codec_tag));

        size -= 4;

    }

    if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) {

        par->codec_id = aiff_codec_get_id(par->bits_per_coded_sample);

        par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id);

        aiff->block_duration = 1;

    } else {

        switch (par->codec_id) {

        case AV_CODEC_ID_PCM_F32BE:

        case AV_CODEC_ID_PCM_F64BE:

        case AV_CODEC_ID_PCM_S16LE:

        case AV_CODEC_ID_PCM_ALAW:

        case AV_CODEC_ID_PCM_MULAW:

            aiff->block_duration = 1;

            break;

        case AV_CODEC_ID_ADPCM_IMA_QT:

            par->block_align = 34 * channels;

            break;

        case AV_CODEC_ID_MACE3:

            par->block_align = 2 * channels;

            break;

        case AV_CODEC_ID_ADPCM_G726LE:

            par->bits_per_coded_sample = 5;

        case AV_CODEC_ID_ADPCM_IMA_WS:

        case AV_CODEC_ID_ADPCM_G722:

        case AV_CODEC_ID_MACE6:

        case AV_CODEC_ID_CBD2_DPCM:

        case AV_CODEC_ID_SDX2_DPCM:

            par->block_align = 1 * channels;

            break;

        case AV_CODEC_ID_GSM:

            par->block_align = 33;

            break;

        case AV_CODEC_ID_G728:

            par->block_align = 5;

            break;

        case AV_CODEC_ID_ADPCM_N64:

            par->block_align = 9;

            break;

        default:

            aiff->block_duration = 1;

            break;

        }

        if (par->block_align > 0)

            aiff->block_duration = av_get_audio_frame_duration2(par,

                                                                par->block_align);

    }

    /* Block align needs to be computed in all cases, as the definition

     * is specific to applications -> here we use the WAVE format definition */

    if (!par->block_align)

        par->block_align = (av_get_bits_per_sample(par->codec_id) * channels) >> 3;

    if (aiff->block_duration) {

        par->bit_rate = av_rescale(par->sample_rate, par->block_align * 8LL,

                                   aiff->block_duration);

        if (par->bit_rate < 0)

            par->bit_rate = 0;

    }

    /* Chunk is over */

    if (size)

        avio_skip(pb, size);

    return num_frames;

}

static int aiff_probe(const AVProbeData *p)

{

    /* check file header */

    if (AV_RL32(p->buf) == MKTAG('F', 'O', 'R', 'M') &&

        AV_RB32(p->buf + 4) >= 4 &&

        p->buf[8] == 'A' && p->buf[9] == 'I' &&

        p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))

        return AVPROBE_SCORE_MAX;

    else

        return 0;

}

/* aiff input */

static int aiff_read_header(AVFormatContext *s)

{

    int ret;

    int64_t filesize, size;

    int64_t offset = 0, position;

    uint32_t tag;

    unsigned version = AIFF_C_VERSION1;

    AVIOContext *pb = s->pb;

    AVStream * st;

    AIFFInputContext *aiff = s->priv_data;

    ID3v2ExtraMeta *id3v2_extra_meta;

    /* check FORM header */

    filesize = get_tag(pb, &tag);

    if (filesize < 4 || tag != MKTAG('F', 'O', 'R', 'M'))

        return AVERROR_INVALIDDATA;

    /* AIFF data type */

    tag = avio_rl32(pb);

    if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */

        version = AIFF;

    else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */

        return AVERROR_INVALIDDATA;

    filesize -= 4;

    st = avformat_new_stream(s, NULL);

    if (!st)

        return AVERROR(ENOMEM);

    while (filesize > 0) {

        /* parse different chunks */

        size = get_tag(pb, &tag);

        if (size == AVERROR_EOF && offset > 0 && st->codecpar->block_align) {

            av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");

            goto got_sound;

        }

        if (size < 0)

            return size;

        filesize -= size + 8;

        switch (tag) {

        case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */

            /* Then for the complete header info */

            st->nb_frames = get_aiff_header(s, size, version);

            if (st->nb_frames < 0)

                return st->nb_frames;

            if (offset > 0) // COMM is after SSND

                goto got_sound;

            break;

        case MKTAG('I', 'D', '3', ' '):

            position = avio_tell(pb);

            ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);

            if (id3v2_extra_meta)

                if ((ret = ff_id3v2_parse_apic(s, id3v2_extra_meta)) < 0 ||

                    (ret = ff_id3v2_parse_chapters(s, id3v2_extra_meta)) < 0) {

                    ff_id3v2_free_extra_meta(&id3v2_extra_meta);

                    return ret;

                }

            ff_id3v2_free_extra_meta(&id3v2_extra_meta);

            if (position + size > avio_tell(pb))

                avio_skip(pb, position + size - avio_tell(pb));

            break;

        case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */

            version = avio_rb32(pb);

            break;

        case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */

            get_meta(s, "title"    , size);

            break;

        case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */

            get_meta(s, "author"   , size);

            break;

        case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */

            get_meta(s, "copyright", size);

            break;

        case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */

            get_meta(s, "comment"  , size);

            break;

        case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */

            if (size < 8)

                return AVERROR_INVALIDDATA;

            aiff->data_end = avio_tell(pb) + size;

            offset = avio_rb32(pb);      /* Offset of sound data */

            avio_rb32(pb);               /* BlockSize... don't care */

            offset += avio_tell(pb);    /* Compute absolute data offset */

            if (st->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL))    /* Assume COMM already parsed */

                goto got_sound;

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

                av_log(s, AV_LOG_ERROR, "file is not seekable\n");

                return -1;

            }

            avio_skip(pb, size - 8);

            break;

        case MKTAG('w', 'a', 'v', 'e'):

            if ((uint64_t)size > (1<<30))

                return AVERROR_INVALIDDATA;

            if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)

                return ret;

            if (   (st->codecpar->codec_id == AV_CODEC_ID_QDMC || st->codecpar->codec_id == AV_CODEC_ID_QDM2)

                && size>=12*4 && !st->codecpar->block_align) {

                st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4);

                aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4);

            } else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) {

                char rate = 0;

                if (size >= 25)

                    rate = st->codecpar->extradata[24];

                switch (rate) {

                case 'H': // RATE_HALF

                    st->codecpar->block_align = 17;

                    break;

                case 'F': // RATE_FULL

                default:

                    st->codecpar->block_align = 35;

                }

                aiff->block_duration = 160;

                st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) /

                                         aiff->block_duration;

            }

            break;

        case MKTAG('C','H','A','N'):

            if ((ret = ff_mov_read_chan(s, pb, st, size)) < 0)

                return ret;

            break;

        case MKTAG('A','P','C','M'): /* XA ADPCM compressed sound chunk */

            st->codecpar->codec_id = AV_CODEC_ID_ADPCM_XA;

            aiff->data_end = avio_tell(pb) + size;

            offset = avio_tell(pb) + 8;

            /* This field is unknown and its data seems to be irrelevant */

            avio_rb32(pb);

            st->codecpar->block_align = avio_rb32(pb);

            goto got_sound;

            break;

        case MKTAG('A','P','P','L'):

            if (size > 4) {

                uint32_t chunk = avio_rl32(pb);

                size -= 4;

                if (chunk == MKTAG('s','t','o','c')) {

                    int len = avio_r8(pb);

                    size--;

                    if (len == 11 && size > 11) {

                        uint8_t chunk[11];

                        ret = avio_read(pb, chunk, 11);

                        if (ret > 0)

                            size -= ret;

                        if (!memcmp(chunk, "VADPCMCODES", sizeof(chunk))) {

                            if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0)

                                return ret;

                            size -= ret;

                        }

                    }

                }

            }

            avio_skip(pb, size);

            break;

        case 0:

            if (offset > 0 && st->codecpar->block_align) // COMM && SSND

                goto got_sound;

        default: /* Jump */

            avio_skip(pb, size);

        }

        /* Skip required padding byte for odd-sized chunks. */

        if (size & 1) {

            filesize--;

            avio_skip(pb, 1);

        }

    }

    ret = ff_replaygain_export(st, s->metadata);

    if (ret < 0)

        return ret;

got_sound:

    if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) {

        av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n");

        st->codecpar->block_align = 35;

    } else if (st->codecpar->block_align <= 0) {

        av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");

        return AVERROR_INVALIDDATA;

    }

    if (aiff->block_duration < 0)

        return AVERROR_INVALIDDATA;

    /* Now positioned, get the sound data start and end */

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

    st->start_time = 0;

    st->duration = st->nb_frames * aiff->block_duration;

    /* Position the stream at the first block */

    avio_seek(pb, offset, SEEK_SET);

    return 0;

}

#define MAX_SIZE 4096

static int aiff_read_packet(AVFormatContext *s,

                            AVPacket *pkt)

{

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

    AIFFInputContext *aiff = s->priv_data;

    int64_t max_size;

    int res, size;

    /* calculate size of remaining data */

    max_size = aiff->data_end - avio_tell(s->pb);

    if (max_size <= 0)

        return AVERROR_EOF;

    if (!st->codecpar->block_align) {

        av_log(s, AV_LOG_ERROR, "block_align not set\n");

        return AVERROR_INVALIDDATA;

    }

    /* Now for that packet */

    switch (st->codecpar->codec_id) {

    case AV_CODEC_ID_ADPCM_IMA_QT:

    case AV_CODEC_ID_GSM:

    case AV_CODEC_ID_QDM2:

    case AV_CODEC_ID_QCELP:

        size = st->codecpar->block_align;

        break;

    default:

        size = st->codecpar->block_align ? (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align : MAX_SIZE;

        if (!size)

            return AVERROR_INVALIDDATA;

    }

    size = FFMIN(max_size, size);

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

    if (res < 0)

        return res;

    if (size >= st->codecpar->block_align)

        pkt->flags &= ~AV_PKT_FLAG_CORRUPT;

    /* Only one stream in an AIFF file */

    pkt->stream_index = 0;

    pkt->duration     = (res / st->codecpar->block_align) * (int64_t) aiff->block_duration;

    return 0;

}

const FFInputFormat ff_aiff_demuxer = {

    .p.name         = "aiff",

    .p.long_name    = NULL_IF_CONFIG_SMALL("Audio IFF"),

    .p.codec_tag    = ff_aiff_codec_tags_list,

    .priv_data_size = sizeof(AIFFInputContext),

    .read_probe     = aiff_probe,

    .read_header    = aiff_read_header,

    .read_packet    = aiff_read_packet,

    .read_seek      = ff_pcm_read_seek,

};