/*

  * 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/intfloat_readwrite.h"

 #include "libavutil/dict.h"

 #include "avformat.h"

 #include "pcm.h"

 #include "aiff.h"

 #include "isom.h"

 
 #define AIFF                    0
 #define AIFF_C_VERSION1         0xA2805140
 

 typedef struct {
     int64_t data_end;
 } AIFFInputContext;
 

 static enum CodecID aiff_codec_get_id(int bps)

 {
     if (bps <= 8)
         return CODEC_ID_PCM_S8;
     if (bps <= 16)
         return CODEC_ID_PCM_S16BE;
     if (bps <= 24)
         return CODEC_ID_PCM_S24BE;
     if (bps <= 32)
         return CODEC_ID_PCM_S32BE;
 
     /* bigger than 32 isn't allowed  */

     return CODEC_ID_NONE;

 }
 
 /* returns the size of the found tag */

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

 {
     int size;
 
     if (url_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_METADATA_DONT_STRDUP_VAL);

     }else
         size+= size&1;
 
     avio_skip(s->pb, size);

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

 static unsigned int get_aiff_header(AVIOContext *pb, AVCodecContext *codec,

                              int size, unsigned version)
 {
     AVExtFloat ext;
     double sample_rate;
     unsigned int num_frames;
 
     if (size & 1)
         size++;

     codec->codec_type = AVMEDIA_TYPE_AUDIO;

     codec->channels = avio_rb16(pb);
     num_frames = avio_rb32(pb);
     codec->bits_per_coded_sample = avio_rb16(pb);

     avio_read(pb, (uint8_t*)&ext, sizeof(ext));/* Sample rate is in */

     sample_rate = av_ext2dbl(ext);          /* 80 bits BE IEEE extended float */
     codec->sample_rate = sample_rate;
     size -= 18;
 
     /* Got an AIFF-C? */
     if (version == AIFF_C_VERSION1) {

         codec->codec_tag = avio_rl32(pb);

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

         switch (codec->codec_id) {
         case CODEC_ID_PCM_S16BE:

             codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
             codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);

             break;
         case CODEC_ID_ADPCM_IMA_QT:
             codec->block_align = 34*codec->channels;

             codec->frame_size = 64;

             break;

         case CODEC_ID_MACE3:

             codec->block_align = 2*codec->channels;
             codec->frame_size = 6;
             break;

         case CODEC_ID_MACE6:

             codec->block_align = 1*codec->channels;

             codec->frame_size = 6;
             break;

         case CODEC_ID_GSM:
             codec->block_align = 33;
             codec->frame_size = 160;
             break;

         case CODEC_ID_QCELP:
             codec->block_align = 35;
             codec->frame_size= 160;
             break;

         default:
             break;

         }
         size -= 4;
     } else {
         /* Need the codec type */

         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);

     }
 
     /* Block align needs to be computed in all cases, as the definition
      * is specific to applications -> here we use the WAVE format definition */

     if (!codec->block_align)

         codec->block_align = (codec->bits_per_coded_sample * codec->channels) >> 3;

     codec->bit_rate = (codec->frame_size ? codec->sample_rate/codec->frame_size :
                        codec->sample_rate) * (codec->block_align << 3);

 
     /* 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,
                             AVFormatParameters *ap)
 {

     int size, filesize;

     int64_t offset = 0;

     uint32_t tag;
     unsigned version = AIFF_C_VERSION1;

     AVIOContext *pb = s->pb;

     AVStream * st;

     AIFFInputContext *aiff = s->priv_data;

 
     /* 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 = av_new_stream(s, 0);
     if (!st)

         return AVERROR(ENOMEM);

 
     while (filesize > 0) {
         /* parse different chunks */
         size = get_tag(pb, &tag);
         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(pb, st->codec, size, version);

             if (st->nb_frames < 0)
                 return st->nb_frames;
             if (offset > 0) // COMM is after SSND
                 goto got_sound;
             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->codec->block_align)    /* Assume COMM already parsed */

                 goto got_sound;

             if (!pb->seekable) {

                 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;

             st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
             if (!st->codec->extradata)
                 return AVERROR(ENOMEM);
             st->codec->extradata_size = size;

             avio_read(pb, st->codec->extradata, size);

             break;

         case MKTAG('C','H','A','N'):
             if (size < 12)
                 return AVERROR_INVALIDDATA;

             ff_mov_read_chan(s, size, st->codec);

             break;

         default: /* Jump */
             if (size & 1)   /* Always even aligned */
                 size++;

             avio_skip(pb, size);

         }
     }
 

     if (!st->codec->block_align) {
         av_log(s, AV_LOG_ERROR, "could not find COMM tag\n");
         return -1;
     }

 
 got_sound:
     /* Now positioned, get the sound data start and end */
     if (st->nb_frames)
         s->file_size = st->nb_frames * st->codec->block_align;
 
     av_set_pts_info(st, 64, 1, st->codec->sample_rate);
     st->start_time = 0;

     st->duration = st->codec->frame_size ?
         st->nb_frames * st->codec->frame_size : st->nb_frames;

 
     /* 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;
 

     /* Now for that packet */

     if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
         size = st->codec->block_align;
     else
         size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
     size = FFMIN(max_size, size);
     res = av_get_packet(s->pb, pkt, size);

     if (res < 0)
         return res;
 
     /* Only one stream in an AIFF file */
     pkt->stream_index = 0;
     return 0;
 }
 

 AVInputFormat ff_aiff_demuxer = {

     "aiff",

     NULL_IF_CONFIG_SMALL("Audio IFF"),

     sizeof(AIFFInputContext),

     aiff_probe,
     aiff_read_header,
     aiff_read_packet,

     NULL,

     pcm_read_seek,

     .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0},

 };