/* * 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/mathematics.h"#include "libavutil/dict.h"#include "avformat.h"#include "internal.h"#include "pcm.h"#include "aiff.h"#include "isom.h"#include "id3v2.h"#include "mov_chan.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 int get_tag(AVIOContext *pb, uint32_t * tag){    int size;     if (avio_feof(pb))        return AVERROR(EIO);     *tag = avio_rl32(pb);    size = avio_rb32(pb);     if (size < 0)        size = 0x7fffffff;     return size;} /* Metadata string read */static void get_meta(AVFormatContext *s, const char *key, int size){    uint8_t *str = av_malloc(size+1);     if (str) {        int res = avio_read(s->pb, str, size);        if (res < 0){            av_free(str);            return;        }        size += (size&1)-res;        str[res] = 0;        av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);    }else        size+= size&1;     avio_skip(s->pb, size);} /* Returns the number of sound data frames or negative on error */static int get_aiff_header(AVFormatContext *s, int 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;     if (size & 1)        size++;    par->codec_type = AVMEDIA_TYPE_AUDIO;    par->channels = avio_rb16(pb);    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;    par->sample_rate = sample_rate;    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 * par->channels;            break;        case AV_CODEC_ID_MACE3:            par->block_align = 2 * par->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_SDX2_DPCM:            par->block_align = 1 * par->channels;            break;        case AV_CODEC_ID_GSM:            par->block_align = 33;            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) * par->channels) >> 3;     if (aiff->block_duration) {        par->bit_rate = (int64_t)par->sample_rate * (par->block_align << 3) /                        aiff->block_duration;    }     /* Chunk is over */    if (size)        avio_skip(pb, size);     return num_frames;} static int aiff_probe(AVProbeData *p){    /* check file header */    if (p->buf[0] == 'F' && p->buf[1] == 'O' &&        p->buf[2] == 'R' && p->buf[3] == 'M' &&        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, size, filesize;    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 = NULL;     /* check FORM header */    filesize = get_tag(pb, &tag);    if (filesize < 0 || 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) {                    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 */            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 -1;            if (ff_get_extradata(s, st->codecpar, pb, size) < 0)                return AVERROR(ENOMEM);            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(ff_mov_read_chan(s, pb, st, size) < 0)                return AVERROR_INVALIDDATA;            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);        }    } 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) {        av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");        return -1;    }     /* 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;    }    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) * aiff->block_duration;    return 0;} AVInputFormat ff_aiff_demuxer = {    .name           = "aiff",    .long_name      = NULL_IF_CONFIG_SMALL("Audio IFF"),    .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,    .codec_tag      = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },};