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ffmpeg / libavformat / ape.c @ 7e1720de

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1 bf4a1f17 Kostya Shishkov
/*
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 * Monkey's Audio APE demuxer
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 * Copyright (c) 2007 Benjamin Zores <ben@geexbox.org>
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 *  based upon libdemac from Dave Chapman.
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <stdio.h>
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#include "avformat.h"
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27 7f559eb1 Aurelien Jacobs
#define ENABLE_DEBUG 0
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29 bf4a1f17 Kostya Shishkov
/* The earliest and latest file formats supported by this library */
30 c1f3c630 Kostya Shishkov
#define APE_MIN_VERSION 3950
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#define APE_MAX_VERSION 3990
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#define MAC_FORMAT_FLAG_8_BIT                 1 // is 8-bit [OBSOLETE]
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#define MAC_FORMAT_FLAG_CRC                   2 // uses the new CRC32 error detection [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL        4 // uint32 nPeakLevel after the header [OBSOLETE]
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#define MAC_FORMAT_FLAG_24_BIT                8 // is 24-bit [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS    16 // has the number of seek elements after the peak level
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#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER    32 // create the wave header on decompression (not stored)
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#define MAC_SUBFRAME_SIZE 4608
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#define APE_EXTRADATA_SIZE 6
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44 781ad2f5 Benjamin Zores
/* APE tags */
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#define APE_TAG_VERSION               2000
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#define APE_TAG_FOOTER_BYTES          32
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#define APE_TAG_FLAG_CONTAINS_HEADER  (1 << 31)
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#define APE_TAG_FLAG_IS_HEADER        (1 << 29)
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#define TAG(name, field)  {name, offsetof(AVFormatContext, field), sizeof(((AVFormatContext *)0)->field)}
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static const struct {
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    char *name;
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    int offset;
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    int size;
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} tags[] = {
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    TAG("Title"    , title    ),
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    TAG("Artist"   , author   ),
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    TAG("Copyright", copyright),
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    TAG("Comment"  , comment  ),
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    TAG("Album"    , album    ),
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    TAG("Year"     , year     ),
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    TAG("Track"    , track    ),
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    TAG("Genre"    , genre    ),
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    { NULL }
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};
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typedef struct {
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    int64_t pos;
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    int nblocks;
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    int size;
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    int skip;
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    int64_t pts;
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} APEFrame;
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typedef struct {
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    /* Derived fields */
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    uint32_t junklength;
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    uint32_t firstframe;
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    uint32_t totalsamples;
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    int currentframe;
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    APEFrame *frames;
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    /* Info from Descriptor Block */
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    char magic[4];
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    int16_t fileversion;
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    int16_t padding1;
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    uint32_t descriptorlength;
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    uint32_t headerlength;
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    uint32_t seektablelength;
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    uint32_t wavheaderlength;
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    uint32_t audiodatalength;
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    uint32_t audiodatalength_high;
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    uint32_t wavtaillength;
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    uint8_t md5[16];
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    /* Info from Header Block */
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    uint16_t compressiontype;
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    uint16_t formatflags;
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    uint32_t blocksperframe;
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    uint32_t finalframeblocks;
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    uint32_t totalframes;
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    uint16_t bps;
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    uint16_t channels;
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    uint32_t samplerate;
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    /* Seektable */
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    uint32_t *seektable;
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} APEContext;
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static void ape_tag_read_field(AVFormatContext *s)
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{
113 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
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    uint8_t buf[1024];
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    uint32_t size;
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    int i;
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    memset(buf, 0, 1024);
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    size = get_le32(pb);  /* field size */
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    url_fskip(pb, 4);     /* skip field flags */
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    for (i=0; pb->buf_ptr[i]!='0' && pb->buf_ptr[i]>=0x20 && pb->buf_ptr[i]<=0x7E; i++);
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    get_buffer(pb, buf, FFMIN(i, 1024));
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    url_fskip(pb, 1);
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    for (i=0; tags[i].name; i++)
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        if (!strcmp (buf, tags[i].name)) {
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            if (tags[i].size == sizeof(int)) {
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                char tmp[16];
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                get_buffer(pb, tmp, FFMIN(sizeof(tmp), size));
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                *(int *)(((char *)s)+tags[i].offset) = atoi(tmp);
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            } else {
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                get_buffer(pb, ((char *)s) + tags[i].offset,
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                           FFMIN(tags[i].size, size));
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            }
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            break;
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        }
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    if (!tags[i].name)
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        url_fskip(pb, size);
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}
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static void ape_parse_tag(AVFormatContext *s)
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{
146 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
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    int file_size = url_fsize(pb);
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    uint32_t val, fields, tag_bytes;
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    uint8_t buf[8];
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    int i;
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    if (file_size < APE_TAG_FOOTER_BYTES)
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        return;
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    url_fseek(pb, file_size - APE_TAG_FOOTER_BYTES, SEEK_SET);
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    get_buffer(pb, buf, 8);    /* APETAGEX */
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    if (strncmp(buf, "APETAGEX", 8)) {
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        av_log(NULL, AV_LOG_ERROR, "Invalid APE Tags\n");
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        return;
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    }
162
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    val = get_le32(pb);        /* APE tag version */
164
    if (val > APE_TAG_VERSION) {
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        av_log(NULL, AV_LOG_ERROR, "Unsupported tag version. (>=%d)\n", APE_TAG_VERSION);
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        return;
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    }
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169
    tag_bytes = get_le32(pb);  /* tag size */
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    if (tag_bytes - APE_TAG_FOOTER_BYTES > (1024 * 1024 * 16)) {
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        av_log(NULL, AV_LOG_ERROR, "Tag size is way too big\n");
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        return;
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    }
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    fields = get_le32(pb);     /* number of fields */
176
    if (fields > 65536) {
177
        av_log(NULL, AV_LOG_ERROR, "Too many tag fields (%d)\n", fields);
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        return;
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    }
180
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    val = get_le32(pb);        /* flags */
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    if (val & APE_TAG_FLAG_IS_HEADER) {
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        av_log(NULL, AV_LOG_ERROR, "APE Tag is a header\n");
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        return;
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    }
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    if (val & APE_TAG_FLAG_CONTAINS_HEADER)
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        tag_bytes += 2*APE_TAG_FOOTER_BYTES;
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    url_fseek(pb, file_size - tag_bytes, SEEK_SET);
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    for (i=0; i<fields; i++)
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        ape_tag_read_field(s);
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195 7f559eb1 Aurelien Jacobs
#if ENABLE_DEBUG
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    av_log(NULL, AV_LOG_DEBUG, "\nAPE Tags:\n\n");
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    av_log(NULL, AV_LOG_DEBUG, "title     = %s\n", s->title);
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    av_log(NULL, AV_LOG_DEBUG, "author    = %s\n", s->author);
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    av_log(NULL, AV_LOG_DEBUG, "copyright = %s\n", s->copyright);
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    av_log(NULL, AV_LOG_DEBUG, "comment   = %s\n", s->comment);
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    av_log(NULL, AV_LOG_DEBUG, "album     = %s\n", s->album);
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    av_log(NULL, AV_LOG_DEBUG, "year      = %d\n", s->year);
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    av_log(NULL, AV_LOG_DEBUG, "track     = %d\n", s->track);
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    av_log(NULL, AV_LOG_DEBUG, "genre     = %s\n", s->genre);
205 7f559eb1 Aurelien Jacobs
#endif
206 781ad2f5 Benjamin Zores
}
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static int ape_probe(AVProbeData * p)
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{
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    if (p->buf[0] == 'M' && p->buf[1] == 'A' && p->buf[2] == 'C' && p->buf[3] == ' ')
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        return AVPROBE_SCORE_MAX;
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    return 0;
214
}
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static void ape_dumpinfo(APEContext * ape_ctx)
217
{
218 7f559eb1 Aurelien Jacobs
#if ENABLE_DEBUG
219 bf4a1f17 Kostya Shishkov
    int i;
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    av_log(NULL, AV_LOG_DEBUG, "Descriptor Block:\n\n");
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    av_log(NULL, 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]);
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    av_log(NULL, AV_LOG_DEBUG, "fileversion          = %d\n", ape_ctx->fileversion);
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    av_log(NULL, AV_LOG_DEBUG, "descriptorlength     = %d\n", ape_ctx->descriptorlength);
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    av_log(NULL, AV_LOG_DEBUG, "headerlength         = %d\n", ape_ctx->headerlength);
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    av_log(NULL, AV_LOG_DEBUG, "seektablelength      = %d\n", ape_ctx->seektablelength);
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    av_log(NULL, AV_LOG_DEBUG, "wavheaderlength      = %d\n", ape_ctx->wavheaderlength);
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    av_log(NULL, AV_LOG_DEBUG, "audiodatalength      = %d\n", ape_ctx->audiodatalength);
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    av_log(NULL, AV_LOG_DEBUG, "audiodatalength_high = %d\n", ape_ctx->audiodatalength_high);
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    av_log(NULL, AV_LOG_DEBUG, "wavtaillength        = %d\n", ape_ctx->wavtaillength);
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    av_log(NULL, AV_LOG_DEBUG, "md5                  = ");
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    for (i = 0; i < 16; i++)
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         av_log(NULL, AV_LOG_DEBUG, "%02x", ape_ctx->md5[i]);
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    av_log(NULL, AV_LOG_DEBUG, "\n");
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    av_log(NULL, AV_LOG_DEBUG, "\nHeader Block:\n\n");
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    av_log(NULL, AV_LOG_DEBUG, "compressiontype      = %d\n", ape_ctx->compressiontype);
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    av_log(NULL, AV_LOG_DEBUG, "formatflags          = %d\n", ape_ctx->formatflags);
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    av_log(NULL, AV_LOG_DEBUG, "blocksperframe       = %d\n", ape_ctx->blocksperframe);
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    av_log(NULL, AV_LOG_DEBUG, "finalframeblocks     = %d\n", ape_ctx->finalframeblocks);
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    av_log(NULL, AV_LOG_DEBUG, "totalframes          = %d\n", ape_ctx->totalframes);
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    av_log(NULL, AV_LOG_DEBUG, "bps                  = %d\n", ape_ctx->bps);
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    av_log(NULL, AV_LOG_DEBUG, "channels             = %d\n", ape_ctx->channels);
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    av_log(NULL, AV_LOG_DEBUG, "samplerate           = %d\n", ape_ctx->samplerate);
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    av_log(NULL, AV_LOG_DEBUG, "\nSeektable\n\n");
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    if ((ape_ctx->seektablelength / sizeof(uint32_t)) != ape_ctx->totalframes) {
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        av_log(NULL, AV_LOG_DEBUG, "No seektable\n");
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    } else {
251
        for (i = 0; i < ape_ctx->seektablelength / sizeof(uint32_t); i++) {
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            if (i < ape_ctx->totalframes - 1) {
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                av_log(NULL, AV_LOG_DEBUG, "%8d   %d (%d bytes)\n", i, ape_ctx->seektable[i], ape_ctx->seektable[i + 1] - ape_ctx->seektable[i]);
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            } else {
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                av_log(NULL, AV_LOG_DEBUG, "%8d   %d\n", i, ape_ctx->seektable[i]);
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            }
257
        }
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    }
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    av_log(NULL, AV_LOG_DEBUG, "\nFrames\n\n");
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    for (i = 0; i < ape_ctx->totalframes; i++)
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        av_log(NULL, AV_LOG_DEBUG, "%8d   %8lld %8d (%d samples)\n", i, ape_ctx->frames[i].pos, ape_ctx->frames[i].size, ape_ctx->frames[i].nblocks);
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    av_log(NULL, AV_LOG_DEBUG, "\nCalculated information:\n\n");
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    av_log(NULL, AV_LOG_DEBUG, "junklength           = %d\n", ape_ctx->junklength);
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    av_log(NULL, AV_LOG_DEBUG, "firstframe           = %d\n", ape_ctx->firstframe);
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    av_log(NULL, AV_LOG_DEBUG, "totalsamples         = %d\n", ape_ctx->totalsamples);
268 7f559eb1 Aurelien Jacobs
#endif
269 bf4a1f17 Kostya Shishkov
}
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static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
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{
273 899681cd Björn Axelsson
    ByteIOContext *pb = s->pb;
274 bf4a1f17 Kostya Shishkov
    APEContext *ape = s->priv_data;
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    AVStream *st;
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    uint32_t tag;
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    int i;
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    int total_blocks;
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    int64_t pts;
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281
    /* TODO: Skip any leading junk such as id3v2 tags */
282
    ape->junklength = 0;
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    tag = get_le32(pb);
285
    if (tag != MKTAG('M', 'A', 'C', ' '))
286
        return -1;
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288
    ape->fileversion = get_le16(pb);
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    if (ape->fileversion < APE_MIN_VERSION || ape->fileversion > APE_MAX_VERSION) {
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        av_log(s, AV_LOG_ERROR, "Unsupported file version - %d.%02d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10);
292
        return -1;
293
    }
294
295
    if (ape->fileversion >= 3980) {
296
        ape->padding1             = get_le16(pb);
297
        ape->descriptorlength     = get_le32(pb);
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        ape->headerlength         = get_le32(pb);
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        ape->seektablelength      = get_le32(pb);
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        ape->wavheaderlength      = get_le32(pb);
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        ape->audiodatalength      = get_le32(pb);
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        ape->audiodatalength_high = get_le32(pb);
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        ape->wavtaillength        = get_le32(pb);
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        get_buffer(pb, ape->md5, 16);
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        /* Skip any unknown bytes at the end of the descriptor.
307
           This is for future compatibility */
308
        if (ape->descriptorlength > 52)
309
            url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR);
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        /* Read header data */
312
        ape->compressiontype      = get_le16(pb);
313
        ape->formatflags          = get_le16(pb);
314
        ape->blocksperframe       = get_le32(pb);
315
        ape->finalframeblocks     = get_le32(pb);
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        ape->totalframes          = get_le32(pb);
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        ape->bps                  = get_le16(pb);
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        ape->channels             = get_le16(pb);
319
        ape->samplerate           = get_le32(pb);
320
    } else {
321
        ape->descriptorlength = 0;
322
        ape->headerlength = 32;
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        ape->compressiontype      = get_le16(pb);
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        ape->formatflags          = get_le16(pb);
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        ape->channels             = get_le16(pb);
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        ape->samplerate           = get_le32(pb);
328
        ape->wavheaderlength      = get_le32(pb);
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        ape->wavtaillength        = get_le32(pb);
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        ape->totalframes          = get_le32(pb);
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        ape->finalframeblocks     = get_le32(pb);
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        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_PEAK_LEVEL) {
334
            url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */
335
            ape->headerlength += 4;
336
        }
337
338
        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
339
            ape->seektablelength = get_le32(pb);
340
            ape->headerlength += 4;
341
            ape->seektablelength *= sizeof(int32_t);
342
        } else
343
            ape->seektablelength = ape->totalframes * sizeof(int32_t);
344
345
        if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
346
            ape->bps = 8;
347
        else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
348
            ape->bps = 24;
349
        else
350
            ape->bps = 16;
351
352
        if (ape->fileversion >= 3950)
353
            ape->blocksperframe = 73728 * 4;
354
        else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800  && ape->compressiontype >= 4000))
355
            ape->blocksperframe = 73728;
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        else
357
            ape->blocksperframe = 9216;
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        /* Skip any stored wav header */
360
        if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
361
            url_fskip(pb, ape->wavheaderlength);
362
    }
363
364
    if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
365
        av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes);
366
        return -1;
367
    }
368
    ape->frames       = av_malloc(ape->totalframes * sizeof(APEFrame));
369
    if(!ape->frames)
370
        return AVERROR_NOMEM;
371
    ape->firstframe   = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
372
    ape->currentframe = 0;
373
374
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    ape->totalsamples = ape->finalframeblocks;
376
    if (ape->totalframes > 1)
377
        ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
378
379
    if (ape->seektablelength > 0) {
380
        ape->seektable = av_malloc(ape->seektablelength);
381
        for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
382
            ape->seektable[i] = get_le32(pb);
383
    }
384
385
    ape->frames[0].pos     = ape->firstframe;
386
    ape->frames[0].nblocks = ape->blocksperframe;
387
    ape->frames[0].skip    = 0;
388
    for (i = 1; i < ape->totalframes; i++) {
389
        ape->frames[i].pos      = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
390
        ape->frames[i].nblocks  = ape->blocksperframe;
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        ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
392
        ape->frames[i].skip     = (ape->frames[i].pos - ape->frames[0].pos) & 3;
393
    }
394
    ape->frames[ape->totalframes - 1].size    = ape->finalframeblocks * 4;
395
    ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
396
397
    for (i = 0; i < ape->totalframes; i++) {
398
        if(ape->frames[i].skip){
399
            ape->frames[i].pos  -= ape->frames[i].skip;
400
            ape->frames[i].size += ape->frames[i].skip;
401
        }
402
        ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
403
    }
404
405
406
    ape_dumpinfo(ape);
407
408 781ad2f5 Benjamin Zores
    /* try to read APE tags */
409
    if (!url_is_streamed(pb)) {
410
        ape_parse_tag(s);
411
        url_fseek(pb, 0, SEEK_SET);
412
    }
413
414 bf4a1f17 Kostya Shishkov
    av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
415
416
    /* now we are ready: build format streams */
417
    st = av_new_stream(s, 0);
418
    if (!st)
419
        return -1;
420
421
    total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
422
423
    st->codec->codec_type      = CODEC_TYPE_AUDIO;
424
    st->codec->codec_id        = CODEC_ID_APE;
425
    st->codec->codec_tag       = MKTAG('A', 'P', 'E', ' ');
426
    st->codec->channels        = ape->channels;
427
    st->codec->sample_rate     = ape->samplerate;
428
    st->codec->bits_per_sample = ape->bps;
429
    st->codec->frame_size      = MAC_SUBFRAME_SIZE;
430
431
    st->nb_frames = ape->totalframes;
432
    s->start_time = 0;
433
    s->duration   = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate;
434
    av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
435
436
    st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
437
    st->codec->extradata_size = APE_EXTRADATA_SIZE;
438
    AV_WL16(st->codec->extradata + 0, ape->fileversion);
439
    AV_WL16(st->codec->extradata + 2, ape->compressiontype);
440
    AV_WL16(st->codec->extradata + 4, ape->formatflags);
441
442
    pts = 0;
443
    for (i = 0; i < ape->totalframes; i++) {
444
        ape->frames[i].pts = pts;
445
        av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
446
        pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
447
    }
448
449
    return 0;
450
}
451
452
static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
453
{
454
    int ret;
455
    int nblocks;
456
    APEContext *ape = s->priv_data;
457
    uint32_t extra_size = 8;
458
459 899681cd Björn Axelsson
    if (url_feof(s->pb))
460 bf4a1f17 Kostya Shishkov
        return AVERROR_IO;
461
    if (ape->currentframe > ape->totalframes)
462
        return AVERROR_IO;
463
464 899681cd Björn Axelsson
    url_fseek (s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
465 bf4a1f17 Kostya Shishkov
466
    /* Calculate how many blocks there are in this frame */
467
    if (ape->currentframe == (ape->totalframes - 1))
468
        nblocks = ape->finalframeblocks;
469
    else
470
        nblocks = ape->blocksperframe;
471
472
    if (av_new_packet(pkt,  ape->frames[ape->currentframe].size + extra_size) < 0)
473
        return AVERROR_NOMEM;
474
475
    AV_WL32(pkt->data    , nblocks);
476
    AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
477 899681cd Björn Axelsson
    ret = get_buffer(s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
478 bf4a1f17 Kostya Shishkov
479
    pkt->pts = ape->frames[ape->currentframe].pts;
480
    pkt->stream_index = 0;
481
482
    /* note: we need to modify the packet size here to handle the last
483
       packet */
484
    pkt->size = ret + extra_size;
485
486
    ape->currentframe++;
487
488
    return 0;
489
}
490
491
static int ape_read_close(AVFormatContext * s)
492
{
493
    APEContext *ape = s->priv_data;
494
495
    av_freep(&ape->frames);
496
    av_freep(&ape->seektable);
497
    return 0;
498
}
499
500
static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
501
{
502
    AVStream *st = s->streams[stream_index];
503
    APEContext *ape = s->priv_data;
504
    int index = av_index_search_timestamp(st, timestamp, flags);
505
506
    if (index < 0)
507
        return -1;
508
509
    ape->currentframe = index;
510
    return 0;
511
}
512
513
AVInputFormat ape_demuxer = {
514
    "ape",
515
    "Monkey's Audio",
516
    sizeof(APEContext),
517
    ape_probe,
518
    ape_read_header,
519
    ape_read_packet,
520
    ape_read_close,
521
    ape_read_seek,
522
    .extensions = "ape,apl,mac"
523
};