diff options
Diffstat (limited to 'ffmpeg/libavformat/ape.c')
| -rw-r--r-- | ffmpeg/libavformat/ape.c | 443 |
1 files changed, 443 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/ape.c b/ffmpeg/libavformat/ape.c new file mode 100644 index 0000000..09ed9c5 --- /dev/null +++ b/ffmpeg/libavformat/ape.c @@ -0,0 +1,443 @@ +/* + * 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 3930 +#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 { + int64_t pos; + int nblocks; + int size; + int skip; + int64_t pts; +} APEFrame; + +typedef struct { + /* Derived fields */ + uint32_t junklength; + uint32_t firstframe; + uint32_t totalsamples; + int currentframe; + APEFrame *frames; + + /* Info from Descriptor Block */ + char magic[4]; + 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; +} APEContext; + +static int ape_probe(AVProbeData * p) +{ + if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ') + return AVPROBE_SCORE_MAX; + + return 0; +} + +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, "magic = \"%c%c%c%c\"\n", ape_ctx->magic[0], ape_ctx->magic[1], ape_ctx->magic[2], ape_ctx->magic[3]); + 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)\n", + i, ape_ctx->seektable[i], + ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]); + } 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" %8d (%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, 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 && (ape->seektablelength / sizeof(*ape->seektable)) < ape->totalframes) { + av_log(s, AV_LOG_ERROR, + "Number of seek entries is less than number of frames: %zu vs. %"PRIu32"\n", + ape->seektablelength / sizeof(*ape->seektable), ape->totalframes); + return AVERROR_INVALIDDATA; + } + ape->frames = av_malloc(ape->totalframes * sizeof(APEFrame)); + if(!ape->frames) + return AVERROR(ENOMEM); + ape->firstframe = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength; + 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_malloc(ape->seektablelength); + if (!ape->seektable) + return AVERROR(ENOMEM); + for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++) + ape->seektable[i] = avio_rl32(pb); + }else{ + av_log(s, AV_LOG_ERROR, "Missing seektable\n"); + return AVERROR_INVALIDDATA; + } + + 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 * 8; + 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; + } + ape->frames[i].size = (ape->frames[i].size + 3) & ~3; + } + + + ape_dumpinfo(s, ape); + + av_log(s, AV_LOG_DEBUG, "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->codec->codec_type = AVMEDIA_TYPE_AUDIO; + st->codec->codec_id = AV_CODEC_ID_APE; + st->codec->codec_tag = MKTAG('A', 'P', 'E', ' '); + st->codec->channels = ape->channels; + st->codec->sample_rate = ape->samplerate; + st->codec->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); + + st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE); + st->codec->extradata_size = APE_EXTRADATA_SIZE; + AV_WL16(st->codec->extradata + 0, ape->fileversion); + AV_WL16(st->codec->extradata + 2, ape->compressiontype); + AV_WL16(st->codec->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) { + 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 (url_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: %d\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); + + 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); + 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", +}; 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