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ffmpeg / libavformat / ape.c @ 0ab1ebea

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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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/* The earliest and latest file formats supported by this library */
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#define APE_MIN_VERSION 3970
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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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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 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;
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}
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static void ape_dumpinfo(APEContext * ape_ctx)
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{
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    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 {
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        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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            }
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        }
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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);
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}
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static int ape_read_header(AVFormatContext * s, AVFormatParameters * ap)
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{
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    ByteIOContext *pb = &s->pb;
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    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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    /* TODO: Skip any leading junk such as id3v2 tags */
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    ape->junklength = 0;
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    tag = get_le32(pb);
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    if (tag != MKTAG('M', 'A', 'C', ' '))
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        return -1;
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    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);
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        return -1;
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    }
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    if (ape->fileversion >= 3980) {
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        ape->padding1             = get_le16(pb);
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        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.
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           This is for future compatibility */
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        if (ape->descriptorlength > 52)
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            url_fseek(pb, ape->descriptorlength - 52, SEEK_CUR);
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        /* Read header data */
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        ape->compressiontype      = get_le16(pb);
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        ape->formatflags          = get_le16(pb);
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        ape->blocksperframe       = get_le32(pb);
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        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);
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        ape->samplerate           = get_le32(pb);
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    } else {
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        ape->descriptorlength = 0;
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        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);
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        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) {
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            url_fseek(pb, 4, SEEK_CUR); /* Skip the peak level */
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            ape->headerlength += 4;
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        }
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        if (ape->formatflags & MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS) {
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            ape->seektablelength = get_le32(pb);
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            ape->headerlength += 4;
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            ape->seektablelength *= sizeof(int32_t);
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        } else
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            ape->seektablelength = ape->totalframes * sizeof(int32_t);
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        if (ape->formatflags & MAC_FORMAT_FLAG_8_BIT)
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            ape->bps = 8;
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        else if (ape->formatflags & MAC_FORMAT_FLAG_24_BIT)
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            ape->bps = 24;
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        else
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            ape->bps = 16;
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        if (ape->fileversion >= 3950)
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            ape->blocksperframe = 73728 * 4;
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        else if (ape->fileversion >= 3900 || (ape->fileversion >= 3800  && ape->compressiontype >= 4000))
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            ape->blocksperframe = 73728;
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        else
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            ape->blocksperframe = 9216;
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        /* Skip any stored wav header */
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        if (!(ape->formatflags & MAC_FORMAT_FLAG_CREATE_WAV_HEADER))
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            url_fskip(pb, ape->wavheaderlength);
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    }
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    if(ape->totalframes > UINT_MAX / sizeof(APEFrame)){
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        av_log(s, AV_LOG_ERROR, "Too many frames: %d\n", ape->totalframes);
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        return -1;
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    }
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    ape->frames       = av_malloc(ape->totalframes * sizeof(APEFrame));
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    if(!ape->frames)
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        return AVERROR_NOMEM;
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    ape->firstframe   = ape->junklength + ape->descriptorlength + ape->headerlength + ape->seektablelength + ape->wavheaderlength;
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    ape->currentframe = 0;
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    ape->totalsamples = ape->finalframeblocks;
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    if (ape->totalframes > 1)
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        ape->totalsamples += ape->blocksperframe * (ape->totalframes - 1);
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    if (ape->seektablelength > 0) {
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        ape->seektable = av_malloc(ape->seektablelength);
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        for (i = 0; i < ape->seektablelength / sizeof(uint32_t); i++)
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            ape->seektable[i] = get_le32(pb);
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    }
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    ape->frames[0].pos     = ape->firstframe;
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    ape->frames[0].nblocks = ape->blocksperframe;
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    ape->frames[0].skip    = 0;
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    for (i = 1; i < ape->totalframes; i++) {
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        ape->frames[i].pos      = ape->seektable[i]; //ape->frames[i-1].pos + ape->blocksperframe;
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        ape->frames[i].nblocks  = ape->blocksperframe;
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        ape->frames[i - 1].size = ape->frames[i].pos - ape->frames[i - 1].pos;
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        ape->frames[i].skip     = (ape->frames[i].pos - ape->frames[0].pos) & 3;
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    }
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    ape->frames[ape->totalframes - 1].size    = ape->finalframeblocks * 4;
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    ape->frames[ape->totalframes - 1].nblocks = ape->finalframeblocks;
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    for (i = 0; i < ape->totalframes; i++) {
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        if(ape->frames[i].skip){
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            ape->frames[i].pos  -= ape->frames[i].skip;
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            ape->frames[i].size += ape->frames[i].skip;
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        }
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        ape->frames[i].size = (ape->frames[i].size + 3) & ~3;
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    }
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    ape_dumpinfo(ape);
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    av_log(s, AV_LOG_DEBUG, "Decoding file - v%d.%02d, compression level %d\n", ape->fileversion / 1000, (ape->fileversion % 1000) / 10, ape->compressiontype);
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    /* now we are ready: build format streams */
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    st = av_new_stream(s, 0);
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    if (!st)
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        return -1;
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    total_blocks = (ape->totalframes == 0) ? 0 : ((ape->totalframes - 1) * ape->blocksperframe) + ape->finalframeblocks;
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    st->codec->codec_type      = CODEC_TYPE_AUDIO;
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    st->codec->codec_id        = CODEC_ID_APE;
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    st->codec->codec_tag       = MKTAG('A', 'P', 'E', ' ');
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    st->codec->channels        = ape->channels;
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    st->codec->sample_rate     = ape->samplerate;
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    st->codec->bits_per_sample = ape->bps;
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    st->codec->frame_size      = MAC_SUBFRAME_SIZE;
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    st->nb_frames = ape->totalframes;
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    s->start_time = 0;
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    s->duration   = (int64_t) total_blocks * AV_TIME_BASE / ape->samplerate;
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    av_set_pts_info(st, 64, MAC_SUBFRAME_SIZE, ape->samplerate);
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    st->codec->extradata = av_malloc(APE_EXTRADATA_SIZE);
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    st->codec->extradata_size = APE_EXTRADATA_SIZE;
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    AV_WL16(st->codec->extradata + 0, ape->fileversion);
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    AV_WL16(st->codec->extradata + 2, ape->compressiontype);
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    AV_WL16(st->codec->extradata + 4, ape->formatflags);
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    pts = 0;
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    for (i = 0; i < ape->totalframes; i++) {
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        ape->frames[i].pts = pts;
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        av_add_index_entry(st, ape->frames[i].pos, ape->frames[i].pts, 0, 0, AVINDEX_KEYFRAME);
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        pts += ape->blocksperframe / MAC_SUBFRAME_SIZE;
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    }
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    return 0;
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}
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static int ape_read_packet(AVFormatContext * s, AVPacket * pkt)
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{
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    int ret;
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    int nblocks;
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    APEContext *ape = s->priv_data;
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    uint32_t extra_size = 8;
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    if (url_feof(&s->pb))
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        return AVERROR_IO;
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    if (ape->currentframe > ape->totalframes)
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        return AVERROR_IO;
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    url_fseek (&s->pb, ape->frames[ape->currentframe].pos, SEEK_SET);
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    /* Calculate how many blocks there are in this frame */
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    if (ape->currentframe == (ape->totalframes - 1))
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        nblocks = ape->finalframeblocks;
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    else
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        nblocks = ape->blocksperframe;
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    if (av_new_packet(pkt,  ape->frames[ape->currentframe].size + extra_size) < 0)
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        return AVERROR_NOMEM;
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    AV_WL32(pkt->data    , nblocks);
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    AV_WL32(pkt->data + 4, ape->frames[ape->currentframe].skip);
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    ret = get_buffer(&s->pb, pkt->data + extra_size, ape->frames[ape->currentframe].size);
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    pkt->pts = ape->frames[ape->currentframe].pts;
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    pkt->stream_index = 0;
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    /* note: we need to modify the packet size here to handle the last
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       packet */
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    pkt->size = ret + extra_size;
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    ape->currentframe++;
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    return 0;
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}
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static int ape_read_close(AVFormatContext * s)
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{
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    APEContext *ape = s->priv_data;
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    av_freep(&ape->frames);
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    av_freep(&ape->seektable);
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    return 0;
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}
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static int ape_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
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{
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    AVStream *st = s->streams[stream_index];
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    APEContext *ape = s->priv_data;
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    int index = av_index_search_timestamp(st, timestamp, flags);
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    if (index < 0)
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        return -1;
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    ape->currentframe = index;
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    return 0;
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}
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AVInputFormat ape_demuxer = {
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    "ape",
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    "Monkey's Audio",
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    sizeof(APEContext),
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    ape_probe,
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    ape_read_header,
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    ape_read_packet,
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    ape_read_close,
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    ape_read_seek,
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    .extensions = "ape,apl,mac"
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};