diff options
Diffstat (limited to 'ffmpeg/libavformat/aiffdec.c')
| -rw-r--r-- | ffmpeg/libavformat/aiffdec.c | 358 |
1 files changed, 358 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/aiffdec.c b/ffmpeg/libavformat/aiffdec.c new file mode 100644 index 0000000..8d466fa --- /dev/null +++ b/ffmpeg/libavformat/aiffdec.c @@ -0,0 +1,358 @@ +/* + * 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/intreadwrite.h" +#include "libavutil/mathematics.h" +#include "libavutil/dict.h" +#include "avformat.h" +#include "internal.h" +#include "pcm.h" +#include "aiff.h" +#include "isom.h" +#include "id3v2.h" +#include "mov_chan.h" + +#define AIFF 0 +#define AIFF_C_VERSION1 0xA2805140 + +typedef struct { + int64_t data_end; + int block_duration; +} AIFFInputContext; + +static enum AVCodecID aiff_codec_get_id(int bps) +{ + if (bps <= 8) + return AV_CODEC_ID_PCM_S8; + if (bps <= 16) + return AV_CODEC_ID_PCM_S16BE; + if (bps <= 24) + return AV_CODEC_ID_PCM_S24BE; + if (bps <= 32) + return AV_CODEC_ID_PCM_S32BE; + + /* bigger than 32 isn't allowed */ + return AV_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_DICT_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(AVFormatContext *s, int size, + unsigned version) +{ + AVIOContext *pb = s->pb; + AVCodecContext *codec = s->streams[0]->codec; + AIFFInputContext *aiff = s->priv_data; + 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; + + /* get codec id for 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); + size -= 4; + } + + if (version != AIFF_C_VERSION1 || codec->codec_id == AV_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); + aiff->block_duration = 1; + } else { + switch (codec->codec_id) { + case AV_CODEC_ID_PCM_F32BE: + case AV_CODEC_ID_PCM_F64BE: + case AV_CODEC_ID_PCM_S16LE: + case AV_CODEC_ID_PCM_ALAW: + case AV_CODEC_ID_PCM_MULAW: + aiff->block_duration = 1; + break; + case AV_CODEC_ID_ADPCM_IMA_QT: + codec->block_align = 34*codec->channels; + break; + case AV_CODEC_ID_MACE3: + codec->block_align = 2*codec->channels; + break; + case AV_CODEC_ID_MACE6: + codec->block_align = 1*codec->channels; + break; + case AV_CODEC_ID_GSM: + codec->block_align = 33; + break; + case AV_CODEC_ID_QCELP: + codec->block_align = 35; + break; + default: + aiff->block_duration = 1; + break; + } + if (codec->block_align > 0) + aiff->block_duration = av_get_audio_frame_duration(codec, + codec->block_align); + } + + /* 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 = (av_get_bits_per_sample(codec->codec_id) * codec->channels) >> 3; + + if (aiff->block_duration) { + codec->bit_rate = codec->sample_rate * (codec->block_align << 3) / + aiff->block_duration; + } + + /* 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) +{ + int ret, 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; + ID3v2ExtraMeta *id3v2_extra_meta = NULL; + + /* 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(s, size, version); + if (st->nb_frames < 0) + return st->nb_frames; + if (offset > 0) // COMM is after SSND + goto got_sound; + break; + case MKTAG('I', 'D', '3', ' '): + ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta); + if (id3v2_extra_meta) + if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) { + ff_id3v2_free_extra_meta(&id3v2_extra_meta); + return ret; + } + ff_id3v2_free_extra_meta(&id3v2_extra_meta); + 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 && !pb->seekable) /* 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); + if (st->codec->codec_id == AV_CODEC_ID_QDM2 && size>=12*4 && !st->codec->block_align) { + st->codec->block_align = AV_RB32(st->codec->extradata+11*4); + aiff->block_duration = AV_RB32(st->codec->extradata+9*4); + } + break; + case MKTAG('C','H','A','N'): + if(ff_mov_read_chan(s, pb, st, size) < 0) + return AVERROR_INVALIDDATA; + 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->nb_frames * aiff->block_duration; + + /* 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; + + if (size >= st->codec->block_align) + pkt->flags &= ~AV_PKT_FLAG_CORRUPT; + /* Only one stream in an AIFF file */ + pkt->stream_index = 0; + pkt->duration = (res / st->codec->block_align) * aiff->block_duration; + 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 = ff_pcm_read_seek, + .codec_tag = (const AVCodecTag* const []){ ff_codec_aiff_tags, 0 }, +}; |