yading@11: /*
yading@11:  * AIFF/AIFF-C demuxer
yading@11:  * Copyright (c) 2006  Patrick Guimond
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/mathematics.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "pcm.h"
yading@11: #include "aiff.h"
yading@11: #include "isom.h"
yading@11: #include "id3v2.h"
yading@11: #include "mov_chan.h"
yading@11: 
yading@11: #define AIFF                    0
yading@11: #define AIFF_C_VERSION1         0xA2805140
yading@11: 
yading@11: typedef struct {
yading@11:     int64_t data_end;
yading@11:     int block_duration;
yading@11: } AIFFInputContext;
yading@11: 
yading@11: static enum AVCodecID aiff_codec_get_id(int bps)
yading@11: {
yading@11:     if (bps <= 8)
yading@11:         return AV_CODEC_ID_PCM_S8;
yading@11:     if (bps <= 16)
yading@11:         return AV_CODEC_ID_PCM_S16BE;
yading@11:     if (bps <= 24)
yading@11:         return AV_CODEC_ID_PCM_S24BE;
yading@11:     if (bps <= 32)
yading@11:         return AV_CODEC_ID_PCM_S32BE;
yading@11: 
yading@11:     /* bigger than 32 isn't allowed  */
yading@11:     return AV_CODEC_ID_NONE;
yading@11: }
yading@11: 
yading@11: /* returns the size of the found tag */
yading@11: static int get_tag(AVIOContext *pb, uint32_t * tag)
yading@11: {
yading@11:     int size;
yading@11: 
yading@11:     if (url_feof(pb))
yading@11:         return AVERROR(EIO);
yading@11: 
yading@11:     *tag = avio_rl32(pb);
yading@11:     size = avio_rb32(pb);
yading@11: 
yading@11:     if (size < 0)
yading@11:         size = 0x7fffffff;
yading@11: 
yading@11:     return size;
yading@11: }
yading@11: 
yading@11: /* Metadata string read */
yading@11: static void get_meta(AVFormatContext *s, const char *key, int size)
yading@11: {
yading@11:     uint8_t *str = av_malloc(size+1);
yading@11: 
yading@11:     if (str) {
yading@11:         int res = avio_read(s->pb, str, size);
yading@11:         if (res < 0){
yading@11:             av_free(str);
yading@11:             return;
yading@11:         }
yading@11:         size += (size&1)-res;
yading@11:         str[res] = 0;
yading@11:         av_dict_set(&s->metadata, key, str, AV_DICT_DONT_STRDUP_VAL);
yading@11:     }else
yading@11:         size+= size&1;
yading@11: 
yading@11:     avio_skip(s->pb, size);
yading@11: }
yading@11: 
yading@11: /* Returns the number of sound data frames or negative on error */
yading@11: static unsigned int get_aiff_header(AVFormatContext *s, int size,
yading@11:                                     unsigned version)
yading@11: {
yading@11:     AVIOContext *pb        = s->pb;
yading@11:     AVCodecContext *codec  = s->streams[0]->codec;
yading@11:     AIFFInputContext *aiff = s->priv_data;
yading@11:     int exp;
yading@11:     uint64_t val;
yading@11:     double sample_rate;
yading@11:     unsigned int num_frames;
yading@11: 
yading@11:     if (size & 1)
yading@11:         size++;
yading@11:     codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     codec->channels = avio_rb16(pb);
yading@11:     num_frames = avio_rb32(pb);
yading@11:     codec->bits_per_coded_sample = avio_rb16(pb);
yading@11: 
yading@11:     exp = avio_rb16(pb);
yading@11:     val = avio_rb64(pb);
yading@11:     sample_rate = ldexp(val, exp - 16383 - 63);
yading@11:     codec->sample_rate = sample_rate;
yading@11:     size -= 18;
yading@11: 
yading@11:     /* get codec id for AIFF-C */
yading@11:     if (version == AIFF_C_VERSION1) {
yading@11:         codec->codec_tag = avio_rl32(pb);
yading@11:         codec->codec_id  = ff_codec_get_id(ff_codec_aiff_tags, codec->codec_tag);
yading@11:         size -= 4;
yading@11:     }
yading@11: 
yading@11:     if (version != AIFF_C_VERSION1 || codec->codec_id == AV_CODEC_ID_PCM_S16BE) {
yading@11:         codec->codec_id = aiff_codec_get_id(codec->bits_per_coded_sample);
yading@11:         codec->bits_per_coded_sample = av_get_bits_per_sample(codec->codec_id);
yading@11:         aiff->block_duration = 1;
yading@11:     } else {
yading@11:         switch (codec->codec_id) {
yading@11:         case AV_CODEC_ID_PCM_F32BE:
yading@11:         case AV_CODEC_ID_PCM_F64BE:
yading@11:         case AV_CODEC_ID_PCM_S16LE:
yading@11:         case AV_CODEC_ID_PCM_ALAW:
yading@11:         case AV_CODEC_ID_PCM_MULAW:
yading@11:             aiff->block_duration = 1;
yading@11:             break;
yading@11:         case AV_CODEC_ID_ADPCM_IMA_QT:
yading@11:             codec->block_align = 34*codec->channels;
yading@11:             break;
yading@11:         case AV_CODEC_ID_MACE3:
yading@11:             codec->block_align = 2*codec->channels;
yading@11:             break;
yading@11:         case AV_CODEC_ID_MACE6:
yading@11:             codec->block_align = 1*codec->channels;
yading@11:             break;
yading@11:         case AV_CODEC_ID_GSM:
yading@11:             codec->block_align = 33;
yading@11:             break;
yading@11:         case AV_CODEC_ID_QCELP:
yading@11:             codec->block_align = 35;
yading@11:             break;
yading@11:         default:
yading@11:             aiff->block_duration = 1;
yading@11:             break;
yading@11:         }
yading@11:         if (codec->block_align > 0)
yading@11:             aiff->block_duration = av_get_audio_frame_duration(codec,
yading@11:                                                                codec->block_align);
yading@11:     }
yading@11: 
yading@11:     /* Block align needs to be computed in all cases, as the definition
yading@11:      * is specific to applications -> here we use the WAVE format definition */
yading@11:     if (!codec->block_align)
yading@11:         codec->block_align = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3;
yading@11: 
yading@11:     if (aiff->block_duration) {
yading@11:         codec->bit_rate = codec->sample_rate * (codec->block_align << 3) /
yading@11:                           aiff->block_duration;
yading@11:     }
yading@11: 
yading@11:     /* Chunk is over */
yading@11:     if (size)
yading@11:         avio_skip(pb, size);
yading@11: 
yading@11:     return num_frames;
yading@11: }
yading@11: 
yading@11: static int aiff_probe(AVProbeData *p)
yading@11: {
yading@11:     /* check file header */
yading@11:     if (p->buf[0] == 'F' && p->buf[1] == 'O' &&
yading@11:         p->buf[2] == 'R' && p->buf[3] == 'M' &&
yading@11:         p->buf[8] == 'A' && p->buf[9] == 'I' &&
yading@11:         p->buf[10] == 'F' && (p->buf[11] == 'F' || p->buf[11] == 'C'))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     else
yading@11:         return 0;
yading@11: }
yading@11: 
yading@11: /* aiff input */
yading@11: static int aiff_read_header(AVFormatContext *s)
yading@11: {
yading@11:     int ret, size, filesize;
yading@11:     int64_t offset = 0, position;
yading@11:     uint32_t tag;
yading@11:     unsigned version = AIFF_C_VERSION1;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     AVStream * st;
yading@11:     AIFFInputContext *aiff = s->priv_data;
yading@11:     ID3v2ExtraMeta *id3v2_extra_meta = NULL;
yading@11: 
yading@11:     /* check FORM header */
yading@11:     filesize = get_tag(pb, &tag);
yading@11:     if (filesize < 0 || tag != MKTAG('F', 'O', 'R', 'M'))
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     /* AIFF data type */
yading@11:     tag = avio_rl32(pb);
yading@11:     if (tag == MKTAG('A', 'I', 'F', 'F'))       /* Got an AIFF file */
yading@11:         version = AIFF;
yading@11:     else if (tag != MKTAG('A', 'I', 'F', 'C'))  /* An AIFF-C file then */
yading@11:         return AVERROR_INVALIDDATA;
yading@11: 
yading@11:     filesize -= 4;
yading@11: 
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11: 
yading@11:     while (filesize > 0) {
yading@11:         /* parse different chunks */
yading@11:         size = get_tag(pb, &tag);
yading@11:         if (size < 0)
yading@11:             return size;
yading@11: 
yading@11:         filesize -= size + 8;
yading@11: 
yading@11:         switch (tag) {
yading@11:         case MKTAG('C', 'O', 'M', 'M'):     /* Common chunk */
yading@11:             /* Then for the complete header info */
yading@11:             st->nb_frames = get_aiff_header(s, size, version);
yading@11:             if (st->nb_frames < 0)
yading@11:                 return st->nb_frames;
yading@11:             if (offset > 0) // COMM is after SSND
yading@11:                 goto got_sound;
yading@11:             break;
yading@11:         case MKTAG('I', 'D', '3', ' '):
yading@11:             position = avio_tell(pb);
yading@11:             ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
yading@11:             if (id3v2_extra_meta)
yading@11:                 if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
yading@11:                     ff_id3v2_free_extra_meta(&id3v2_extra_meta);
yading@11:                     return ret;
yading@11:                 }
yading@11:             ff_id3v2_free_extra_meta(&id3v2_extra_meta);
yading@11:             if (position + size > avio_tell(pb))
yading@11:                 avio_skip(pb, position + size - avio_tell(pb));
yading@11:             break;
yading@11:         case MKTAG('F', 'V', 'E', 'R'):     /* Version chunk */
yading@11:             version = avio_rb32(pb);
yading@11:             break;
yading@11:         case MKTAG('N', 'A', 'M', 'E'):     /* Sample name chunk */
yading@11:             get_meta(s, "title"    , size);
yading@11:             break;
yading@11:         case MKTAG('A', 'U', 'T', 'H'):     /* Author chunk */
yading@11:             get_meta(s, "author"   , size);
yading@11:             break;
yading@11:         case MKTAG('(', 'c', ')', ' '):     /* Copyright chunk */
yading@11:             get_meta(s, "copyright", size);
yading@11:             break;
yading@11:         case MKTAG('A', 'N', 'N', 'O'):     /* Annotation chunk */
yading@11:             get_meta(s, "comment"  , size);
yading@11:             break;
yading@11:         case MKTAG('S', 'S', 'N', 'D'):     /* Sampled sound chunk */
yading@11:             aiff->data_end = avio_tell(pb) + size;
yading@11:             offset = avio_rb32(pb);      /* Offset of sound data */
yading@11:             avio_rb32(pb);               /* BlockSize... don't care */
yading@11:             offset += avio_tell(pb);    /* Compute absolute data offset */
yading@11:             if (st->codec->block_align && !pb->seekable)    /* Assume COMM already parsed */
yading@11:                 goto got_sound;
yading@11:             if (!pb->seekable) {
yading@11:                 av_log(s, AV_LOG_ERROR, "file is not seekable\n");
yading@11:                 return -1;
yading@11:             }
yading@11:             avio_skip(pb, size - 8);
yading@11:             break;
yading@11:         case MKTAG('w', 'a', 'v', 'e'):
yading@11:             if ((uint64_t)size > (1<<30))
yading@11:                 return -1;
yading@11:             st->codec->extradata = av_mallocz(size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@11:             if (!st->codec->extradata)
yading@11:                 return AVERROR(ENOMEM);
yading@11:             st->codec->extradata_size = size;
yading@11:             avio_read(pb, st->codec->extradata, size);
yading@11:             if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) {
yading@11:                 st->codec->block_align = AV_RB32(st->codec->extradata+11*4);
yading@11:                 aiff->block_duration = AV_RB32(st->codec->extradata+9*4);
yading@11:             }
yading@11:             break;
yading@11:         case MKTAG('C','H','A','N'):
yading@11:             if(ff_mov_read_chan(s, pb, st, size) < 0)
yading@11:                 return AVERROR_INVALIDDATA;
yading@11:             break;
yading@11:         default: /* Jump */
yading@11:             if (size & 1)   /* Always even aligned */
yading@11:                 size++;
yading@11:             avio_skip(pb, size);
yading@11:         }
yading@11:     }
yading@11: 
yading@11: got_sound:
yading@11:     if (!st->codec->block_align) {
yading@11:         av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n");
yading@11:         return -1;
yading@11:     }
yading@11: 
yading@11:     /* Now positioned, get the sound data start and end */
yading@11:     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
yading@11:     st->start_time = 0;
yading@11:     st->duration = st->nb_frames * aiff->block_duration;
yading@11: 
yading@11:     /* Position the stream at the first block */
yading@11:     avio_seek(pb, offset, SEEK_SET);
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: #define MAX_SIZE 4096
yading@11: 
yading@11: static int aiff_read_packet(AVFormatContext *s,
yading@11:                             AVPacket *pkt)
yading@11: {
yading@11:     AVStream *st = s->streams[0];
yading@11:     AIFFInputContext *aiff = s->priv_data;
yading@11:     int64_t max_size;
yading@11:     int res, size;
yading@11: 
yading@11:     /* calculate size of remaining data */
yading@11:     max_size = aiff->data_end - avio_tell(s->pb);
yading@11:     if (max_size <= 0)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     /* Now for that packet */
yading@11:     if (st->codec->block_align >= 33) // GSM, QCLP, IMA4
yading@11:         size = st->codec->block_align;
yading@11:     else
yading@11:         size = (MAX_SIZE / st->codec->block_align) * st->codec->block_align;
yading@11:     size = FFMIN(max_size, size);
yading@11:     res = av_get_packet(s->pb, pkt, size);
yading@11:     if (res < 0)
yading@11:         return res;
yading@11: 
yading@11:     if (size >= st->codec->block_align)
yading@11:         pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
yading@11:     /* Only one stream in an AIFF file */
yading@11:     pkt->stream_index = 0;
yading@11:     pkt->duration     = (res / st->codec->block_align) * aiff->block_duration;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_aiff_demuxer = {
yading@11:     .name           = "aiff",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Audio IFF"),
yading@11:     .priv_data_size = sizeof(AIFFInputContext),
yading@11:     .read_probe     = aiff_probe,
yading@11:     .read_header    = aiff_read_header,
yading@11:     .read_packet    = aiff_read_packet,
yading@11:     .read_seek      = ff_pcm_read_seek,
yading@11:     .codec_tag      = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 },
yading@11: };