| /* |
| * 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/mathematics.h" |
| #include "libavutil/dict.h" |
| #include "avformat.h" |
| #include "internal.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) |
| { |
| int exp; |
| uint64_t val; |
| 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); |
| |
| exp = avio_rb16(pb); |
| val = avio_rb64(pb); |
| sample_rate = ldexp(val, exp - 16383 - 63); |
| 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 = avformat_new_stream(s, NULL); |
| 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); |
| } |
| } |
| |
| got_sound: |
| if (!st->codec->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->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 = { |
| .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 = pcm_read_seek, |
| .codec_tag= (const AVCodecTag* const []){ff_codec_aiff_tags, 0}, |
| }; |
