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  1. /*
  2.  * AIFF/AIFF-C demuxer
  3.  * Copyright (c) 2006  Patrick Guimond
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "libavutil/intreadwrite.h"
  23. #include "libavutil/mathematics.h"
  24. #include "libavutil/dict.h"
  25. #include "avformat.h"
  26. #include "internal.h"
  27. #include "pcm.h"
  28. #include "aiff.h"
  29. #include "isom.h"
  30. #include "id3v2.h"
  31. #include "mov_chan.h"
  32.  
  33. #define AIFF                    0
  34. #define AIFF_C_VERSION1         0xA2805140
  35.  
  36. typedef struct AIFFInputContext {
  37.     int64_t data_end;
  38.     int block_duration;
  39. } AIFFInputContext;
  40.  
  41. static enum AVCodecID aiff_codec_get_id(int bps)
  42. {
  43.     if (bps <= 8)
  44.         return AV_CODEC_ID_PCM_S8;
  45.     if (bps <= 16)
  46.         return AV_CODEC_ID_PCM_S16BE;
  47.     if (bps <= 24)
  48.         return AV_CODEC_ID_PCM_S24BE;
  49.     if (bps <= 32)
  50.         return AV_CODEC_ID_PCM_S32BE;
  51.  
  52.     /* bigger than 32 isn't allowed  */
  53.     return AV_CODEC_ID_NONE;
  54. }
  55.  
  56. /* returns the size of the found tag */
  57. static int get_tag(AVIOContext *pb, uint32_t * tag)
  58. {
  59.     int size;
  60.  
  61.     if (avio_feof(pb))
  62.         return AVERROR(EIO);
  63.  
  64.     *tag = avio_rl32(pb);
  65.     size = avio_rb32(pb);
  66.  
  67.     if (size < 0)
  68.         size = 0x7fffffff;
  69.  
  70.     return size;
  71. }
  72.  
  73. /* Metadata string read */
  74. static void get_meta(AVFormatContext *s, const char *key, int size)
  75. {
  76.     uint8_t *str = av_malloc(size+1);
  77.  
  78.     if (str) {
  79.         int res = avio_read(s->pb, str, size);
  80.         if (res < 0){
  81.             av_free(str);
  82.             return;
  83.         }
  84.         size += (size&1)-res;
  85.         str[res] = 0;
  86.         av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
  87.     }else
  88.         size+= size&1;
  89.  
  90.     avio_skip(s->pb, size);
  91. }
  92.  
  93. /* Returns the number of sound data frames or negative on error */
  94. static int get_aiff_header(AVFormatContext *s, int size,
  95.                                     unsigned version)
  96. {
  97.     AVIOContext *pb        = s->pb;
  98.     AVCodecContext *codec  = s->streams[0]->codec;
  99.     AIFFInputContext *aiff = s->priv_data;
  100.     int exp;
  101.     uint64_t val;
  102.     int sample_rate;
  103.     unsigned int num_frames;
  104.  
  105.     if (size & 1)
  106.         size++;
  107.     codec->codec_type = AVMEDIA_TYPE_AUDIO;
  108.     codec->channels = avio_rb16(pb);
  109.     num_frames = avio_rb32(pb);
  110.     codec->bits_per_coded_sample = avio_rb16(pb);
  111.  
  112.     exp = avio_rb16(pb) - 16383 - 63;
  113.     val = avio_rb64(pb);
  114.     if (exp <-63 || exp >63) {
  115.         av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp);
  116.         return AVERROR_INVALIDDATA;
  117.     }
  118.     if (exp >= 0)
  119.         sample_rate = val << exp;
  120.     else
  121.         sample_rate = (val + (1ULL<<(-exp-1))) >> -exp;
  122.     codec->sample_rate = sample_rate;
  123.     size -= 18;
  124.  
  125.     /* get codec id for AIFF-C */
  126.     if (size < 4) {
  127.         version = AIFF;
  128.     } else if (version == AIFF_C_VERSION1) {
  129.         codec->codec_tag = avio_rl32(pb);
  130.         codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
  131.         size -= 4;
  132.     }
  133.  
  134.     if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
  135.         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
  136.         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
  137.         aiff->block_duration = 1;
  138.     } else {
  139.         switch (codec->codec_id) {
  140.         case AV_CODEC_ID_PCM_F32BE:
  141.         case AV_CODEC_ID_PCM_F64BE:
  142.         case AV_CODEC_ID_PCM_S16LE:
  143.         case AV_CODEC_ID_PCM_ALAW:
  144.         case AV_CODEC_ID_PCM_MULAW:
  145.             aiff->block_duration = 1;
  146.             break;
  147.         case AV_CODEC_ID_ADPCM_IMA_QT:
  148.             codec->block_align = 34*codec->channels;
  149.             break;
  150.         case AV_CODEC_ID_MACE3:
  151.             codec->block_align = 2*codec->channels;
  152.             break;
  153.         case AV_CODEC_ID_ADPCM_G726LE:
  154.             codec->bits_per_coded_sample = 5;
  155.         case AV_CODEC_ID_ADPCM_G722:
  156.         case AV_CODEC_ID_MACE6:
  157.             codec->block_align = 1*codec->channels;
  158.             break;
  159.         case AV_CODEC_ID_GSM:
  160.             codec->block_align = 33;
  161.             break;
  162.         default:
  163.             aiff->block_duration = 1;
  164.             break;
  165.         }
  166.         if (codec->block_align > 0)
  167.             aiff->block_duration = av_get_audio_frame_duration(codec,
  168.                                                                codec->block_align);
  169.     }
  170.  
  171.     /* Block align needs to be computed in all cases, as the definition
  172.      * is specific to applications -> here we use the WAVE format definition */
  173.     if (!codec->block_align)
  174.         codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
  175.  
  176.     if (aiff->block_duration) {
  177.         codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
  178.                           aiff->block_duration;
  179.     }
  180.  
  181.     /* Chunk is over */
  182.     if (size)
  183.         avio_skip(pb, size);
  184.  
  185.     return num_frames;
  186. }
  187.  
  188. static int aiff_probe(AVProbeData *p)
  189. {
  190.     /* check file header */
  191.     if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
  192.         p->buf[2] == 'R' && p->buf[3] == 'M' &&
  193.         p->buf[8] == 'A' && p->buf[9] == 'I' &&
  194.         p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
  195.         return AVPROBE_SCORE_MAX;
  196.     else
  197.         return 0;
  198. }
  199.  
  200. /* aiff input */
  201. static int aiff_read_header(AVFormatContext *s)
  202. {
  203.     int ret, size, filesize;
  204.     int64_t offset = 0, position;
  205.     uint32_t tag;
  206.     unsigned version = AIFF_C_VERSION1;
  207.     AVIOContext *pb = s->pb;
  208.     AVStream * st;
  209.     AIFFInputContext *aiff = s->priv_data;
  210.     ID3v2ExtraMeta *id3v2_extra_meta = NULL;
  211.  
  212.     /* check FORM header */
  213.     filesize = get_tag(pb, &tag);
  214.     if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
  215.         return AVERROR_INVALIDDATA;
  216.  
  217.     /* AIFF data type */
  218.     tag = avio_rl32(pb);
  219.     if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
  220.         version = AIFF;
  221.     else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
  222.         return AVERROR_INVALIDDATA;
  223.  
  224.     filesize -= 4;
  225.  
  226.     st = avformat_new_stream(s, NULL);
  227.     if (!st)
  228.         return AVERROR(ENOMEM);
  229.  
  230.     while (filesize > 0) {
  231.         /* parse different chunks */
  232.         size = get_tag(pb, &tag);
  233.  
  234.         if (size == AVERROR_EOF && offset > 0 && st->codec->block_align) {
  235.             av_log(s, AV_LOG_WARNING, "header parser hit EOF\n");
  236.             goto got_sound;
  237.         }
  238.         if (size < 0)
  239.             return size;
  240.  
  241.         filesize -= size + 8;
  242.  
  243.         switch (tag) {
  244.         case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
  245.             /* Then for the complete header info */
  246.             st->nb_frames = get_aiff_header(s, size, version);
  247.             if (st->nb_frames < 0)
  248.                 return st->nb_frames;
  249.             if (offset > 0) // COMM is after SSND
  250.                 goto got_sound;
  251.             break;
  252.         case MKTAG('I', 'D', '3', ' '):
  253.             position = avio_tell(pb);
  254.             ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
  255.             if (id3v2_extra_meta)
  256.                 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
  257.                     ff_id3v2_free_extra_meta(&id3v2_extra_meta);
  258.                     return ret;
  259.                 }
  260.             ff_id3v2_free_extra_meta(&id3v2_extra_meta);
  261.             if (position + size > avio_tell(pb))
  262.                 avio_skip(pb, position + size - avio_tell(pb));
  263.             break;
  264.         case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
  265.             version = avio_rb32(pb);
  266.             break;
  267.         case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
  268.             get_meta(s, "title"    , size);
  269.             break;
  270.         case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
  271.             get_meta(s, "author"   , size);
  272.             break;
  273.         case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
  274.             get_meta(s, "copyright", size);
  275.             break;
  276.         case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
  277.             get_meta(s, "comment"  , size);
  278.             break;
  279.         case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
  280.             aiff->data_end = avio_tell(pb) + size;
  281.             offset = avio_rb32(pb);      /* Offset of sound data */
  282.             avio_rb32(pb);               /* BlockSize... don't care */
  283.             offset += avio_tell(pb);    /* Compute absolute data offset */
  284.             if (st->codec->block_align && !pb->seekable)    /* Assume COMM already parsed */
  285.                 goto got_sound;
  286.             if (!pb->seekable) {
  287.                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
  288.                 return -1;
  289.             }
  290.             avio_skip(pb, size - 8);
  291.             break;
  292.         case MKTAG('w', 'a', 'v', 'e'):
  293.             if ((uint64_t)size > (1<<30))
  294.                 return -1;
  295.             if (ff_get_extradata(st->codec, pb, size) < 0)
  296.                 return AVERROR(ENOMEM);
  297.             if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
  298.                 st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
  299.                 aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
  300.             } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
  301.                 char rate = 0;
  302.                 if (size >= 25)
  303.                     rate = st->codec->extradata[24];
  304.                 switch (rate) {
  305.                 case 'H': // RATE_HALF
  306.                     st->codec->block_align = 17;
  307.                     break;
  308.                 case 'F': // RATE_FULL
  309.                 default:
  310.                     st->codec->block_align = 35;
  311.                 }
  312.                 aiff->block_duration = 160;
  313.                 st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
  314.                                       aiff->block_duration;
  315.             }
  316.             break;
  317.         case MKTAG('C','H','A','N'):
  318.             if(ff_mov_read_chan(s, pb, st, size) < 0)
  319.                 return AVERROR_INVALIDDATA;
  320.             break;
  321.         case 0:
  322.             if (offset > 0 && st->codec->block_align) // COMM && SSND
  323.                 goto got_sound;
  324.         default: /* Jump */
  325.             if (size & 1)   /* Always even aligned */
  326.                 size++;
  327.             avio_skip(pb, size);
  328.         }
  329.     }
  330.  
  331. got_sound:
  332.     if (!st->codec->block_align) {
  333.         av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
  334.         return -1;
  335.     }
  336.  
  337.     /* Now positioned, get the sound data start and end */
  338.     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  339.     st->start_time = 0;
  340.     st->duration = st->nb_frames * aiff->block_duration;
  341.  
  342.     /* Position the stream at the first block */
  343.     avio_seek(pb, offset, SEEK_SET);
  344.  
  345.     return 0;
  346. }
  347.  
  348. #define MAX_SIZE 4096
  349.  
  350. static int aiff_read_packet(AVFormatContext *s,
  351.                             AVPacket *pkt)
  352. {
  353.     AVStream *st = s->streams[0];
  354.     AIFFInputContext *aiff = s->priv_data;
  355.     int64_t max_size;
  356.     int res, size;
  357.  
  358.     /* calculate size of remaining data */
  359.     max_size = aiff->data_end - avio_tell(s->pb);
  360.     if (max_size <= 0)
  361.         return AVERROR_EOF;
  362.  
  363.     /* Now for that packet */
  364.     switch (st->codec->codec_id) {
  365.     case AV_CODEC_ID_ADPCM_IMA_QT:
  366.     case AV_CODEC_ID_GSM:
  367.     case AV_CODEC_ID_QDM2:
  368.     case AV_CODEC_ID_QCELP:
  369.         size = st->codec->block_align;
  370.         break;
  371.     default:
  372.         size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
  373.     }
  374.     size = FFMIN(max_size, size);
  375.     res = av_get_packet(s->pb, pkt, size);
  376.     if (res < 0)
  377.         return res;
  378.  
  379.     if (size >= st->codec->block_align)
  380.         pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
  381.     /* Only one stream in an AIFF file */
  382.     pkt->stream_index = 0;
  383.     pkt->duration     = (res / st->codec->block_align) * aiff->block_duration;
  384.     return 0;
  385. }
  386.  
  387. AVInputFormat ff_aiff_demuxer = {
  388.     .name           = "aiff",
  389.     .long_name      = NULL_IF_CONFIG_SMALL("Audio IFF"),
  390.     .priv_data_size = sizeof(AIFFInputContext),
  391.     .read_probe     = aiff_probe,
  392.     .read_header    = aiff_read_header,
  393.     .read_packet    = aiff_read_packet,
  394.     .read_seek      = ff_pcm_read_seek,
  395.     .codec_tag      = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
  396. };
  397.