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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 {
  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 (url_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 unsigned 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.     double 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);
  113.     val = avio_rb64(pb);
  114.     sample_rate = ldexp(val, exp - 16383 - 63);
  115.     codec->sample_rate = sample_rate;
  116.     size -= 18;
  117.  
  118.     /* get codec id for AIFF-C */
  119.     if (version == AIFF_C_VERSION1) {
  120.         codec->codec_tag = avio_rl32(pb);
  121.         codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
  122.         size -= 4;
  123.     }
  124.  
  125.     if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
  126.         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
  127.         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
  128.         aiff->block_duration = 1;
  129.     } else {
  130.         switch (codec->codec_id) {
  131.         case AV_CODEC_ID_PCM_F32BE:
  132.         case AV_CODEC_ID_PCM_F64BE:
  133.         case AV_CODEC_ID_PCM_S16LE:
  134.         case AV_CODEC_ID_PCM_ALAW:
  135.         case AV_CODEC_ID_PCM_MULAW:
  136.             aiff->block_duration = 1;
  137.             break;
  138.         case AV_CODEC_ID_ADPCM_IMA_QT:
  139.             codec->block_align = 34*codec->channels;
  140.             break;
  141.         case AV_CODEC_ID_MACE3:
  142.             codec->block_align = 2*codec->channels;
  143.             break;
  144.         case AV_CODEC_ID_ADPCM_G726LE:
  145.             codec->bits_per_coded_sample = 5;
  146.         case AV_CODEC_ID_ADPCM_G722:
  147.         case AV_CODEC_ID_MACE6:
  148.             codec->block_align = 1*codec->channels;
  149.             break;
  150.         case AV_CODEC_ID_GSM:
  151.             codec->block_align = 33;
  152.             break;
  153.         default:
  154.             aiff->block_duration = 1;
  155.             break;
  156.         }
  157.         if (codec->block_align > 0)
  158.             aiff->block_duration = av_get_audio_frame_duration(codec,
  159.                                                                codec->block_align);
  160.     }
  161.  
  162.     /* Block align needs to be computed in all cases, as the definition
  163.      * is specific to applications -> here we use the WAVE format definition */
  164.     if (!codec->block_align)
  165.         codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
  166.  
  167.     if (aiff->block_duration) {
  168.         codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
  169.                           aiff->block_duration;
  170.     }
  171.  
  172.     /* Chunk is over */
  173.     if (size)
  174.         avio_skip(pb, size);
  175.  
  176.     return num_frames;
  177. }
  178.  
  179. static int aiff_probe(AVProbeData *p)
  180. {
  181.     /* check file header */
  182.     if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
  183.         p->buf[2] == 'R' && p->buf[3] == 'M' &&
  184.         p->buf[8] == 'A' && p->buf[9] == 'I' &&
  185.         p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
  186.         return AVPROBE_SCORE_MAX;
  187.     else
  188.         return 0;
  189. }
  190.  
  191. /* aiff input */
  192. static int aiff_read_header(AVFormatContext *s)
  193. {
  194.     int ret, size, filesize;
  195.     int64_t offset = 0, position;
  196.     uint32_t tag;
  197.     unsigned version = AIFF_C_VERSION1;
  198.     AVIOContext *pb = s->pb;
  199.     AVStream * st;
  200.     AIFFInputContext *aiff = s->priv_data;
  201.     ID3v2ExtraMeta *id3v2_extra_meta = NULL;
  202.  
  203.     /* check FORM header */
  204.     filesize = get_tag(pb, &tag);
  205.     if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
  206.         return AVERROR_INVALIDDATA;
  207.  
  208.     /* AIFF data type */
  209.     tag = avio_rl32(pb);
  210.     if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
  211.         version = AIFF;
  212.     else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
  213.         return AVERROR_INVALIDDATA;
  214.  
  215.     filesize -= 4;
  216.  
  217.     st = avformat_new_stream(s, NULL);
  218.     if (!st)
  219.         return AVERROR(ENOMEM);
  220.  
  221.     while (filesize > 0) {
  222.         /* parse different chunks */
  223.         size = get_tag(pb, &tag);
  224.         if (size < 0)
  225.             return size;
  226.  
  227.         filesize -= size + 8;
  228.  
  229.         switch (tag) {
  230.         case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
  231.             /* Then for the complete header info */
  232.             st->nb_frames = get_aiff_header(s, size, version);
  233.             if (st->nb_frames < 0)
  234.                 return st->nb_frames;
  235.             if (offset > 0) // COMM is after SSND
  236.                 goto got_sound;
  237.             break;
  238.         case MKTAG('I', 'D', '3', ' '):
  239.             position = avio_tell(pb);
  240.             ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
  241.             if (id3v2_extra_meta)
  242.                 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
  243.                     ff_id3v2_free_extra_meta(&id3v2_extra_meta);
  244.                     return ret;
  245.                 }
  246.             ff_id3v2_free_extra_meta(&id3v2_extra_meta);
  247.             if (position + size > avio_tell(pb))
  248.                 avio_skip(pb, position + size - avio_tell(pb));
  249.             break;
  250.         case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
  251.             version = avio_rb32(pb);
  252.             break;
  253.         case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
  254.             get_meta(s, "title"    , size);
  255.             break;
  256.         case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
  257.             get_meta(s, "author"   , size);
  258.             break;
  259.         case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
  260.             get_meta(s, "copyright", size);
  261.             break;
  262.         case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
  263.             get_meta(s, "comment"  , size);
  264.             break;
  265.         case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
  266.             aiff->data_end = avio_tell(pb) + size;
  267.             offset = avio_rb32(pb);      /* Offset of sound data */
  268.             avio_rb32(pb);               /* BlockSize... don't care */
  269.             offset += avio_tell(pb);    /* Compute absolute data offset */
  270.             if (st->codec->block_align && !pb->seekable)    /* Assume COMM already parsed */
  271.                 goto got_sound;
  272.             if (!pb->seekable) {
  273.                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
  274.                 return -1;
  275.             }
  276.             avio_skip(pb, size - 8);
  277.             break;
  278.         case MKTAG('w', 'a', 'v', 'e'):
  279.             if ((uint64_t)size > (1<<30))
  280.                 return -1;
  281.             if (ff_alloc_extradata(st->codec, size))
  282.                 return AVERROR(ENOMEM);
  283.             avio_read(pb, st->codec->extradata, size);
  284.             if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
  285.                 st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
  286.                 aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
  287.             } else if (st->codec->codec_id == AV_CODEC_ID_QCELP) {
  288.                 char rate = 0;
  289.                 if (size >= 25)
  290.                     rate = st->codec->extradata[24];
  291.                 switch (rate) {
  292.                 case 'H': // RATE_HALF
  293.                     st->codec->block_align = 17;
  294.                     break;
  295.                 case 'F': // RATE_FULL
  296.                 default:
  297.                     st->codec->block_align = 35;
  298.                 }
  299.                 aiff->block_duration = 160;
  300.                 st->codec->bit_rate = st->codec->sample_rate * (st->codec->block_align << 3) /
  301.                                       aiff->block_duration;
  302.             }
  303.             break;
  304.         case MKTAG('C','H','A','N'):
  305.             if(ff_mov_read_chan(s, pb, st, size) < 0)
  306.                 return AVERROR_INVALIDDATA;
  307.             break;
  308.         default: /* Jump */
  309.             if (size & 1)   /* Always even aligned */
  310.                 size++;
  311.             avio_skip(pb, size);
  312.         }
  313.     }
  314.  
  315. got_sound:
  316.     if (!st->codec->block_align) {
  317.         av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
  318.         return -1;
  319.     }
  320.  
  321.     /* Now positioned, get the sound data start and end */
  322.     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  323.     st->start_time = 0;
  324.     st->duration = st->nb_frames * aiff->block_duration;
  325.  
  326.     /* Position the stream at the first block */
  327.     avio_seek(pb, offset, SEEK_SET);
  328.  
  329.     return 0;
  330. }
  331.  
  332. #define MAX_SIZE 4096
  333.  
  334. static int aiff_read_packet(AVFormatContext *s,
  335.                             AVPacket *pkt)
  336. {
  337.     AVStream *st = s->streams[0];
  338.     AIFFInputContext *aiff = s->priv_data;
  339.     int64_t max_size;
  340.     int res, size;
  341.  
  342.     /* calculate size of remaining data */
  343.     max_size = aiff->data_end - avio_tell(s->pb);
  344.     if (max_size <= 0)
  345.         return AVERROR_EOF;
  346.  
  347.     /* Now for that packet */
  348.     if (st->codec->block_align >= 17) // GSM, QCLP, IMA4
  349.         size = st->codec->block_align;
  350.     else
  351.         size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
  352.     size = FFMIN(max_size, size);
  353.     res = av_get_packet(s->pb, pkt, size);
  354.     if (res < 0)
  355.         return res;
  356.  
  357.     if (size >= st->codec->block_align)
  358.         pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
  359.     /* Only one stream in an AIFF file */
  360.     pkt->stream_index = 0;
  361.     pkt->duration     = (res / st->codec->block_align) * aiff->block_duration;
  362.     return 0;
  363. }
  364.  
  365. AVInputFormat ff_aiff_demuxer = {
  366.     .name           = "aiff",
  367.     .long_name      = NULL_IF_CONFIG_SMALL("Audio IFF"),
  368.     .priv_data_size = sizeof(AIFFInputContext),
  369.     .read_probe     = aiff_probe,
  370.     .read_header    = aiff_read_header,
  371.     .read_packet    = aiff_read_packet,
  372.     .read_seek      = ff_pcm_read_seek,
  373.     .codec_tag      = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
  374. };
  375.