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n3.4.14
libavformat/ape.c
473 строки
17 KB
Michael Niedermayer
avformat/ape: Use 64bit for final frame size
11 мар 2025, 21:47
Не верифицирован
11 мар 2025, 21:47
3b5e846
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/* * Monkey's Audio APE demuxer * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org> * based upon libdemac from Dave Chapman. * * 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 <stdio.h> #include "libavutil/intreadwrite.h" #include "avformat.h" #include "internal.h" #include "apetag.h" /* The earliest and latest file formats supported by this library */ #define APE_MIN_VERSION 3800 #define APE_MAX_VERSION 3990 #define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE] #define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE] #define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE] #define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE] #define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level #define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored) #define APE_EXTRADATA_SIZE 6 typedef struct APEFrame { int64_t pos; int64_t size; int nblocks; int skip; int64_t pts; } APEFrame; typedef struct APEContext { /* Derived fields */ uint32_t junklength; uint32_t firstframe; uint32_t totalsamples; int currentframe; APEFrame *frames; /* Info from Descriptor Block */ int16_t fileversion; int16_t padding1; uint32_t descriptorlength; uint32_t headerlength; uint32_t seektablelength; uint32_t wavheaderlength; uint32_t audiodatalength; uint32_t audiodatalength_high; uint32_t wavtaillength; uint8_t md5[16]; /* Info from Header Block */ uint16_t compressiontype; uint16_t formatflags; uint32_t blocksperframe; uint32_t finalframeblocks; uint32_t totalframes; uint16_t bps; uint16_t channels; uint32_t samplerate; /* Seektable */ uint32_t *seektable; uint8_t *bittable; } APEContext; static int ape_probe(AVProbeData * p) { int version = AV_RL16(p->buf+4); if (AV_RL32(p->buf) != MKTAG('M', 'A', 'C', ' ')) return 0; if (version < APE_MIN_VERSION || version > APE_MAX_VERSION) return AVPROBE_SCORE_MAX/4; return AVPROBE_SCORE_MAX; } static void ape_dumpinfo(AVFormatContext * s, APEContext * ape_ctx) { #ifdef DEBUG int i; av_log(s, AV_LOG_DEBUG, "Descriptor Block:\n\n"); av_log(s, AV_LOG_DEBUG, "fileversion = %"PRId16"\n", ape_ctx->fileversion); av_log(s, AV_LOG_DEBUG, "descriptorlength = %"PRIu32"\n", ape_ctx->descriptorlength); av_log(s, AV_LOG_DEBUG, "headerlength = %"PRIu32"\n", ape_ctx->headerlength); av_log(s, AV_LOG_DEBUG, "seektablelength = %"PRIu32"\n", ape_ctx->seektablelength); av_log(s, AV_LOG_DEBUG, "wavheaderlength = %"PRIu32"\n", ape_ctx->wavheaderlength); av_log(s, AV_LOG_DEBUG, "audiodatalength = %"PRIu32"\n", ape_ctx->audiodatalength); av_log(s, AV_LOG_DEBUG, "audiodatalength_high = %"PRIu32"\n", ape_ctx->audiodatalength_high); av_log(s, AV_LOG_DEBUG, "wavtaillength = %"PRIu32"\n", ape_ctx->wavtaillength); av_log(s, AV_LOG_DEBUG, "md5 = "); for (i = 0; i < 16; i++) av_log(s, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]); av_log(s, AV_LOG_DEBUG, "\n"); av_log(s, AV_LOG_DEBUG, "\nHeader Block:\n\n"); av_log(s, AV_LOG_DEBUG, "compressiontype = %"PRIu16"\n", ape_ctx->compressiontype); av_log(s, AV_LOG_DEBUG, "formatflags = %"PRIu16"\n", ape_ctx->formatflags); av_log(s, AV_LOG_DEBUG, "blocksperframe = %"PRIu32"\n", ape_ctx->blocksperframe); av_log(s, AV_LOG_DEBUG, "finalframeblocks = %"PRIu32"\n", ape_ctx->finalframeblocks); av_log(s, AV_LOG_DEBUG, "totalframes = %"PRIu32"\n", ape_ctx->totalframes); av_log(s, AV_LOG_DEBUG, "bps = %"PRIu16"\n", ape_ctx->bps); av_log(s, AV_LOG_DEBUG, "channels = %"PRIu16"\n", ape_ctx->channels); av_log(s, AV_LOG_DEBUG, "samplerate = %"PRIu32"\n", ape_ctx->samplerate); av_log(s, AV_LOG_DEBUG, "\nSeektable\n\n"); if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) { av_log(s, AV_LOG_DEBUG, "No seektable\n"); } else { for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) { if (i < ape_ctx->totalframes - 1) { av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32" (%"PRIu32" bytes)", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]); if (ape_ctx->bittable) av_log(s, AV_LOG_DEBUG, " + %2d bits\n", ape_ctx->bittable[i]); av_log(s, AV_LOG_DEBUG, "\n"); } else { av_log(s, AV_LOG_DEBUG, "%8d %"PRIu32"\n", i, ape_ctx->seektable[i]); } } } av_log(s, AV_LOG_DEBUG, "\nFrames\n\n"); for (i = 0; i < ape_ctx->totalframes; i++) av_log(s, AV_LOG_DEBUG, "%8d %8"PRId64" %8"PRId64" (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks); av_log(s, AV_LOG_DEBUG, "\nCalculated information:\n\n"); av_log(s, AV_LOG_DEBUG, "junklength = %"PRIu32"\n", ape_ctx->junklength); av_log(s, AV_LOG_DEBUG, "firstframe = %"PRIu32"\n", ape_ctx->firstframe); av_log(s, AV_LOG_DEBUG, "totalsamples = %"PRIu32"\n", ape_ctx->totalsamples); #endif } static int ape_read_header(AVFormatContext * s) { AVIOContext *pb = s->pb; APEContext *ape = s->priv_data; AVStream *st; uint32_t tag; int i; int total_blocks; int64_t final_size = 0; int64_t pts, file_size; /* Skip any leading junk such as id3v2 tags */ ape->junklength = avio_tell(pb); tag = avio_rl32(pb); if (tag != MKTAG('M', 'A', 'C', ' ')) return AVERROR_INVALIDDATA; ape->fileversion = avio_rl16(pb); if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) { av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10); return AVERROR_PATCHWELCOME; } if (ape->fileversion >= 3980) { ape->padding1 = avio_rl16(pb); ape->descriptorlength = avio_rl32(pb); ape->headerlength = avio_rl32(pb); ape->seektablelength = avio_rl32(pb); ape->wavheaderlength = avio_rl32(pb); ape->audiodatalength = avio_rl32(pb); ape->audiodatalength_high = avio_rl32(pb); ape->wavtaillength = avio_rl32(pb); avio_read(pb, ape->md5, 16); /* Skip any unknown bytes at the end of the descriptor. This is for future compatibility */ if (ape->descriptorlength > 52) avio_skip(pb, ape->descriptorlength - 52); /* Read header data */ ape->compressiontype = avio_rl16(pb); ape->formatflags = avio_rl16(pb); ape->blocksperframe = avio_rl32(pb); ape->finalframeblocks = avio_rl32(pb); ape->totalframes = avio_rl32(pb); ape->bps = avio_rl16(pb); ape->channels = avio_rl16(pb); ape->samplerate = avio_rl32(pb); } else { ape->descriptorlength = 0; ape->headerlength = 32; ape->compressiontype = avio_rl16(pb); ape->formatflags = avio_rl16(pb); ape->channels = avio_rl16(pb); ape->samplerate = avio_rl32(pb); ape->wavheaderlength = avio_rl32(pb); ape->wavtaillength = avio_rl32(pb); ape->totalframes = avio_rl32(pb); ape->finalframeblocks = avio_rl32(pb); if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) { avio_skip(pb, 4); /* Skip the peak level */ ape->headerlength += 4; } if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) { ape->seektablelength = avio_rl32(pb); ape->headerlength += 4; ape->seektablelength *= sizeof(int32_t); } else ape->seektablelength = ape->totalframes * sizeof(int32_t); if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT) ape->bps = 8; else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT) ape->bps = 24; else ape->bps = 16; if (ape->fileversion >= 3950) ape->blocksperframe = 73728 * 4; else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800 && ape->compressiontype >= 4000)) ape->blocksperframe = 73728; else ape->blocksperframe = 9216; /* Skip any stored wav header */ if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER)) avio_skip(pb, ape->wavheaderlength); } if(!ape->totalframes){ av_log(s, AV_LOG_ERROR, "No frames in the file!\n"); return AVERROR(EINVAL); } if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){ av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", ape->totalframes); return AVERROR_INVALIDDATA; } if (ape->seektablelength / sizeof(*ape->seektable) < ape->totalframes) { av_log(s, AV_LOG_ERROR, "Number of seek entries is less than number of frames: %"SIZE_SPECIFIER" vs. %"PRIu32"\n", ape->seektablelength / sizeof(*ape->seektable), ape->totalframes); return AVERROR_INVALIDDATA; } ape->frames = av_malloc_array(ape->totalframes, sizeof(APEFrame)); if(!ape->frames) return AVERROR(ENOMEM); ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength; if (ape->fileversion < 3810) ape->firstframe += ape->totalframes; ape->currentframe = 0; ape->totalsamples = ape->finalframeblocks; if (ape->totalframes > 1) ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1); if (ape->seektablelength > 0) { ape->seektable = av_mallocz(ape->seektablelength); if (!ape->seektable) return AVERROR(ENOMEM); for (i = 0; i < ape->seektablelength / sizeof(uint32_t) && !pb->eof_reached; i++) ape->seektable[i] = avio_rl32(pb); if (ape->fileversion < 3810) { ape->bittable = av_mallocz(ape->totalframes); if (!ape->bittable) return AVERROR(ENOMEM); for (i = 0; i < ape->totalframes && !pb->eof_reached; i++) ape->bittable[i] = avio_r8(pb); } if (pb->eof_reached) av_log(s, AV_LOG_WARNING, "File truncated\n"); } ape->frames[0].pos = ape->firstframe; ape->frames[0].nblocks = ape->blocksperframe; ape->frames[0].skip = 0; for (i = 1; i < ape->totalframes; i++) { ape->frames[i].pos = ape->seektable[i] + ape->junklength; ape->frames[i].nblocks = ape->blocksperframe; ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos; ape->frames[i].skip = (ape->frames[i].pos - ape->frames[0].pos) & 3; } ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks; /* calculate final packet size from total file size, if available */ file_size = avio_size(pb); if (file_size > 0) { final_size = file_size - ape->frames[ape->totalframes - 1].pos - ape->wavtaillength; final_size -= final_size & 3; } if (file_size <= 0 || final_size <= 0) final_size = ape->finalframeblocks * 8LL; ape->frames[ape->totalframes - 1].size = final_size; for (i = 0; i < ape->totalframes; i++) { if(ape->frames[i].skip){ ape->frames[i].pos -= ape->frames[i].skip; ape->frames[i].size += ape->frames[i].skip; } if (ape->frames[i].size > INT_MAX - 3) return AVERROR_INVALIDDATA; ape->frames[i].size = (ape->frames[i].size + 3) & ~3; } if (ape->fileversion < 3810) { for (i = 0; i < ape->totalframes; i++) { if (i < ape->totalframes - 1 && ape->bittable[i + 1]) ape->frames[i].size += 4; ape->frames[i].skip <<= 3; ape->frames[i].skip += ape->bittable[i]; } } ape_dumpinfo(s, ape); av_log(s, AV_LOG_VERBOSE, "Decoding file - v%d.%02d, compression level %"PRIu16"\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype); /* now we are ready: build format streams */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks; st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_APE; st->codecpar->codec_tag = MKTAG('A', 'P', 'E', ' '); st->codecpar->channels = ape->channels; st->codecpar->sample_rate = ape->samplerate; st->codecpar->bits_per_coded_sample = ape->bps; st->nb_frames = ape->totalframes; st->start_time = 0; st->duration = total_blocks; avpriv_set_pts_info(st, 64, 1, ape->samplerate); if (ff_alloc_extradata(st->codecpar, APE_EXTRADATA_SIZE)) return AVERROR(ENOMEM); AV_WL16(st->codecpar->extradata + 0, ape->fileversion); AV_WL16(st->codecpar->extradata + 2, ape->compressiontype); AV_WL16(st->codecpar->extradata + 4, ape->formatflags); pts = 0; for (i = 0; i < ape->totalframes; i++) { ape->frames[i].pts = pts; av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME); pts += ape->blocksperframe; } /* try to read APE tags */ if (pb->seekable & AVIO_SEEKABLE_NORMAL) { ff_ape_parse_tag(s); avio_seek(pb, 0, SEEK_SET); } return 0; } static int ape_read_packet(AVFormatContext * s, AVPacket * pkt) { int ret; int nblocks; APEContext *ape = s->priv_data; uint32_t extra_size = 8; if (avio_feof(s->pb)) return AVERROR_EOF; if (ape->currentframe >= ape->totalframes) return AVERROR_EOF; if (avio_seek(s->pb, ape->frames[ape->currentframe].pos, SEEK_SET) < 0) return AVERROR(EIO); /* Calculate how many blocks there are in this frame */ if (ape->currentframe == (ape->totalframes - 1)) nblocks = ape->finalframeblocks; else nblocks = ape->blocksperframe; if (ape->frames[ape->currentframe].size <= 0 || ape->frames[ape->currentframe].size > INT_MAX - extra_size) { av_log(s, AV_LOG_ERROR, "invalid packet size: %8"PRId64"\n", ape->frames[ape->currentframe].size); ape->currentframe++; return AVERROR(EIO); } if (av_new_packet(pkt, ape->frames[ape->currentframe].size + extra_size) < 0) return AVERROR(ENOMEM); AV_WL32(pkt->data , nblocks); AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip); ret = avio_read(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size); if (ret < 0) { av_packet_unref(pkt); return ret; } pkt->pts = ape->frames[ape->currentframe].pts; pkt->stream_index = 0; /* note: we need to modify the packet size here to handle the last packet */ pkt->size = ret + extra_size; ape->currentframe++; return 0; } static int ape_read_close(AVFormatContext * s) { APEContext *ape = s->priv_data; av_freep(&ape->frames); av_freep(&ape->seektable); av_freep(&ape->bittable); return 0; } static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { AVStream *st = s->streams[stream_index]; APEContext *ape = s->priv_data; int index = av_index_search_timestamp(st, timestamp, flags); if (index < 0) return -1; if (avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET) < 0) return -1; ape->currentframe = index; return 0; } AVInputFormat ff_ape_demuxer = { .name = "ape", .long_name = NULL_IF_CONFIG_SMALL("Monkey's Audio"), .priv_data_size = sizeof(APEContext), .read_probe = ape_probe, .read_header = ape_read_header, .read_packet = ape_read_packet, .read_close = ape_read_close, .read_seek = ape_read_seek, .extensions = "ape,apl,mac", };