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n3.4.14
libavformat/aiffdec.c
429 строк
14 KB
Michael Niedermayer
avformat/aiffdec: Use 64bit for block_duration use
24 сен 2022, 23:47
Не верифицирован
24 сен 2022, 23:47
e628454
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/* * 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 AIFFInputContext { 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 int64_t get_tag(AVIOContext *pb, uint32_t * tag) { int64_t size; if (avio_feof(pb)) return AVERROR(EIO); *tag = avio_rl32(pb); size = avio_rb32(pb); return size; } /* Metadata string read */ static void get_meta(AVFormatContext *s, const char *key, int64_t size) { uint8_t *str = NULL; if (size < SIZE_MAX) 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 int get_aiff_header(AVFormatContext *s, int64_t size, unsigned version) { AVIOContext *pb = s->pb; AVCodecParameters *par = s->streams[0]->codecpar; AIFFInputContext *aiff = s->priv_data; int exp; uint64_t val; int sample_rate; unsigned int num_frames; if (size & 1) size++; par->codec_type = AVMEDIA_TYPE_AUDIO; par->channels = avio_rb16(pb); num_frames = avio_rb32(pb); par->bits_per_coded_sample = avio_rb16(pb); exp = avio_rb16(pb) - 16383 - 63; val = avio_rb64(pb); if (exp <-63 || exp >63) { av_log(s, AV_LOG_ERROR, "exp %d is out of range\n", exp); return AVERROR_INVALIDDATA; } if (exp >= 0) sample_rate = val << exp; else sample_rate = (val + (1ULL<<(-exp-1))) >> -exp; if (sample_rate <= 0) return AVERROR_INVALIDDATA; par->sample_rate = sample_rate; if (size < 18) return AVERROR_INVALIDDATA; size -= 18; /* get codec id for AIFF-C */ if (size < 4) { version = AIFF; } else if (version == AIFF_C_VERSION1) { par->codec_tag = avio_rl32(pb); par->codec_id = ff_codec_get_id(ff_codec_aiff_tags, par->codec_tag); if (par->codec_id == AV_CODEC_ID_NONE) avpriv_request_sample(s, "unknown or unsupported codec tag: %s", av_fourcc2str(par->codec_tag)); size -= 4; } if (version != AIFF_C_VERSION1 || par->codec_id == AV_CODEC_ID_PCM_S16BE) { par->codec_id = aiff_codec_get_id(par->bits_per_coded_sample); par->bits_per_coded_sample = av_get_bits_per_sample(par->codec_id); aiff->block_duration = 1; } else { switch (par->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: par->block_align = 34 * par->channels; break; case AV_CODEC_ID_MACE3: par->block_align = 2 * par->channels; break; case AV_CODEC_ID_ADPCM_G726LE: par->bits_per_coded_sample = 5; case AV_CODEC_ID_ADPCM_IMA_WS: case AV_CODEC_ID_ADPCM_G722: case AV_CODEC_ID_MACE6: case AV_CODEC_ID_SDX2_DPCM: par->block_align = 1 * par->channels; break; case AV_CODEC_ID_GSM: par->block_align = 33; break; default: aiff->block_duration = 1; break; } if (par->block_align > 0) aiff->block_duration = av_get_audio_frame_duration2(par, par->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 (!par->block_align) par->block_align = (av_get_bits_per_sample(par->codec_id) * par->channels) >> 3; if (aiff->block_duration) { par->bit_rate = av_rescale(par->sample_rate, par->block_align * 8LL, aiff->block_duration); if (par->bit_rate < 0) par->bit_rate = 0; } /* 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; int64_t filesize, size; int64_t offset = 0, position; 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 < 4 || 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 == AVERROR_EOF && offset > 0 && st->codecpar->block_align) { av_log(s, AV_LOG_WARNING, "header parser hit EOF\n"); goto got_sound; } 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', ' '): position = avio_tell(pb); ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size); if (id3v2_extra_meta) if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0 || (ret = ff_id3v2_parse_chapters(s, &id3v2_extra_meta)) < 0) { ff_id3v2_free_extra_meta(&id3v2_extra_meta); return ret; } ff_id3v2_free_extra_meta(&id3v2_extra_meta); if (position + size > avio_tell(pb)) avio_skip(pb, position + size - avio_tell(pb)); 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 */ if (size < 8) return AVERROR_INVALIDDATA; 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->codecpar->block_align && !(pb->seekable & AVIO_SEEKABLE_NORMAL)) /* Assume COMM already parsed */ goto got_sound; if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) { 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; if (ff_get_extradata(s, st->codecpar, pb, size) < 0) return AVERROR(ENOMEM); if ( (st->codecpar->codec_id == AV_CODEC_ID_QDMC || st->codecpar->codec_id == AV_CODEC_ID_QDM2) && size>=12*4 && !st->codecpar->block_align) { st->codecpar->block_align = AV_RB32(st->codecpar->extradata+11*4); aiff->block_duration = AV_RB32(st->codecpar->extradata+9*4); } else if (st->codecpar->codec_id == AV_CODEC_ID_QCELP) { char rate = 0; if (size >= 25) rate = st->codecpar->extradata[24]; switch (rate) { case 'H': // RATE_HALF st->codecpar->block_align = 17; break; case 'F': // RATE_FULL default: st->codecpar->block_align = 35; } aiff->block_duration = 160; st->codecpar->bit_rate = (int64_t)st->codecpar->sample_rate * (st->codecpar->block_align << 3) / aiff->block_duration; } break; case MKTAG('C','H','A','N'): if(ff_mov_read_chan(s, pb, st, size) < 0) return AVERROR_INVALIDDATA; break; case 0: if (offset > 0 && st->codecpar->block_align) // COMM && SSND goto got_sound; default: /* Jump */ avio_skip(pb, size); } /* Skip required padding byte for odd-sized chunks. */ if (size & 1) { filesize--; avio_skip(pb, 1); } } got_sound: if (!st->codecpar->block_align && st->codecpar->codec_id == AV_CODEC_ID_QCELP) { av_log(s, AV_LOG_WARNING, "qcelp without wave chunk, assuming full rate\n"); st->codecpar->block_align = 35; } else if (st->codecpar->block_align <= 0) { av_log(s, AV_LOG_ERROR, "could not find COMM tag or invalid block_align value\n"); return -1; } if (aiff->block_duration < 0) return AVERROR_INVALIDDATA; /* Now positioned, get the sound data start and end */ avpriv_set_pts_info(st, 64, 1, st->codecpar->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; if (!st->codecpar->block_align) { av_log(s, AV_LOG_ERROR, "block_align not set\n"); return AVERROR_INVALIDDATA; } /* Now for that packet */ switch (st->codecpar->codec_id) { case AV_CODEC_ID_ADPCM_IMA_QT: case AV_CODEC_ID_GSM: case AV_CODEC_ID_QDM2: case AV_CODEC_ID_QCELP: size = st->codecpar->block_align; break; default: size = st->codecpar->block_align ? (MAX_SIZE / st->codecpar->block_align) * st->codecpar->block_align : MAX_SIZE; if (!size) return AVERROR_INVALIDDATA; } size = FFMIN(max_size, size); res = av_get_packet(s->pb, pkt, size); if (res < 0) return res; if (size >= st->codecpar->block_align) pkt->flags &= ~AV_PKT_FLAG_CORRUPT; /* Only one stream in an AIFF file */ pkt->stream_index = 0; pkt->duration = (res / st->codecpar->block_align) * (int64_t) 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 }, };