/* * 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;    int nblocks;    int size;    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" %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 / 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 * 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;    }    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: %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);    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",};