wvdec.c 9.78 KB
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/*
 * WavPack demuxer
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 * Copyright (c) 2006,2011 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * 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
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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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#include "libavutil/channel_layout.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/dict.h"
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#include "avformat.h"
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#include "internal.h"
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#include "apetag.h"
#include "id3v1.h"
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#include "wv.h"
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enum WV_FLAGS {
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    WV_MONO   = 0x0004,
    WV_HYBRID = 0x0008,
    WV_JOINT  = 0x0010,
    WV_CROSSD = 0x0020,
    WV_HSHAPE = 0x0040,
    WV_FLOAT  = 0x0080,
    WV_INT32  = 0x0100,
    WV_HBR    = 0x0200,
    WV_HBAL   = 0x0400,
    WV_MCINIT = 0x0800,
    WV_MCEND  = 0x1000,
};

static const int wv_rates[16] = {
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     6000,  8000,  9600, 11025, 12000, 16000,  22050, 24000,
    32000, 44100, 48000, 64000, 88200, 96000, 192000,    -1
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};

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typedef struct WVContext {
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    uint8_t block_header[WV_HEADER_SIZE];
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    WvHeader header;
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    int rate, chan, bpp;
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    uint32_t chmask;
    int multichannel;
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    int block_parsed;
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    int64_t pos;
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    int64_t apetag_start;
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} WVContext;
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static int wv_probe(AVProbeData *p)
{
    /* check file header */
    if (p->buf_size <= 32)
        return 0;
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    if (AV_RL32(&p->buf[0]) == MKTAG('w', 'v', 'p', 'k') &&
        AV_RL32(&p->buf[4]) >= 24 &&
        AV_RL32(&p->buf[4]) <= WV_BLOCK_LIMIT &&
        AV_RL16(&p->buf[8]) >= 0x402 &&
        AV_RL16(&p->buf[8]) <= 0x410)
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        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

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static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)
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{
    WVContext *wc = ctx->priv_data;
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    int ret;
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    int rate, bpp, chan;
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    uint32_t chmask, flags;
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    wc->pos = avio_tell(pb);
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    /* don't return bogus packets with the ape tag data */
    if (wc->apetag_start && wc->pos >= wc->apetag_start)
        return AVERROR_EOF;

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    ret = avio_read(pb, wc->block_header, WV_HEADER_SIZE);
    if (ret != WV_HEADER_SIZE)
        return (ret < 0) ? ret : AVERROR_EOF;

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    ret = ff_wv_parse_header(&wc->header, wc->block_header);
    if (ret < 0) {
        av_log(ctx, AV_LOG_ERROR, "Invalid block header.\n");
        return ret;
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    }
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    if (wc->header.version < 0x402 || wc->header.version > 0x410) {
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        avpriv_report_missing_feature(ctx, "WV version 0x%03X",
                                      wc->header.version);
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        return AVERROR_PATCHWELCOME;
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    }
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    /* Blocks with zero samples don't contain actual audio information
     * and should be ignored */
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    if (!wc->header.samples)
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        return 0;
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    // parse flags
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    flags  = wc->header.flags;
    bpp    = ((flags & 3) + 1) << 3;
    chan   = 1 + !(flags & WV_MONO);
    chmask = flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
    rate   = wv_rates[(flags >> 23) & 0xF];
    wc->multichannel = !(wc->header.initial && wc->header.final);
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    if (wc->multichannel) {
        chan   = wc->chan;
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        chmask = wc->chmask;
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    }
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    if ((rate == -1 || !chan) && !wc->block_parsed) {
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        int64_t block_end = avio_tell(pb) + wc->header.blocksize;
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        if (!(pb->seekable & AVIO_SEEKABLE_NORMAL)) {
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            av_log(ctx, AV_LOG_ERROR,
                   "Cannot determine additional parameters\n");
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            return AVERROR_INVALIDDATA;
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        }
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        while (avio_tell(pb) < block_end && !avio_feof(pb)) {
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            int id, size;
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            id   = avio_r8(pb);
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            size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
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            size <<= 1;
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            if (id & 0x40)
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                size--;
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            switch (id & 0x3F) {
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            case 0xD:
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                if (size <= 1) {
                    av_log(ctx, AV_LOG_ERROR,
                           "Insufficient channel information\n");
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                    return AVERROR_INVALIDDATA;
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                }
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                chan = avio_r8(pb);
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                switch (size - 2) {
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                case 0:
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                    chmask = avio_r8(pb);
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                    break;
                case 1:
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                    chmask = avio_rl16(pb);
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                    break;
                case 2:
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                    chmask = avio_rl24(pb);
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                    break;
                case 3:
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                    chmask = avio_rl32(pb);
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                    break;
                case 5:
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                    avio_skip(pb, 1);
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                    chan  |= (avio_r8(pb) & 0xF) << 8;
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                    chmask = avio_rl24(pb);
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                    break;
                default:
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                    av_log(ctx, AV_LOG_ERROR,
                           "Invalid channel info size %d\n", size);
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                    return AVERROR_INVALIDDATA;
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                }
                break;
            case 0x27:
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                rate = avio_rl24(pb);
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                break;
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            default:
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                avio_skip(pb, size);
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            }
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            if (id & 0x40)
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                avio_skip(pb, 1);
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        }
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        if (rate == -1) {
            av_log(ctx, AV_LOG_ERROR,
                   "Cannot determine custom sampling rate\n");
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            return AVERROR_INVALIDDATA;
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        }
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        avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);
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    }
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    if (!wc->bpp)
        wc->bpp    = bpp;
    if (!wc->chan)
        wc->chan   = chan;
    if (!wc->chmask)
        wc->chmask = chmask;
    if (!wc->rate)
        wc->rate   = rate;
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    if (flags && bpp != wc->bpp) {
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        av_log(ctx, AV_LOG_ERROR,
               "Bits per sample differ, this block: %i, header block: %i\n",
               bpp, wc->bpp);
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        return AVERROR_INVALIDDATA;
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    }
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    if (flags && !wc->multichannel && chan != wc->chan) {
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        av_log(ctx, AV_LOG_ERROR,
               "Channels differ, this block: %i, header block: %i\n",
               chan, wc->chan);
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        return AVERROR_INVALIDDATA;
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    }
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    if (flags && rate != -1 && rate != wc->rate) {
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        av_log(ctx, AV_LOG_ERROR,
               "Sampling rate differ, this block: %i, header block: %i\n",
               rate, wc->rate);
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        return AVERROR_INVALIDDATA;
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    }
    return 0;
}

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static int wv_read_header(AVFormatContext *s)
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{
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    AVIOContext *pb = s->pb;
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    WVContext *wc = s->priv_data;
    AVStream *st;
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    int ret;
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    wc->block_parsed = 0;
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    for (;;) {
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        if ((ret = wv_read_block_header(s, pb)) < 0)
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            return ret;
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        if (!wc->header.samples)
            avio_skip(pb, wc->header.blocksize);
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        else
            break;
    }
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    /* now we are ready: build format streams */
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    st = avformat_new_stream(s, NULL);
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    if (!st)
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        return AVERROR(ENOMEM);
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    st->codecpar->codec_type            = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_id              = AV_CODEC_ID_WAVPACK;
    st->codecpar->channels              = wc->chan;
    st->codecpar->channel_layout        = wc->chmask;
    st->codecpar->sample_rate           = wc->rate;
    st->codecpar->bits_per_coded_sample = wc->bpp;
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    avpriv_set_pts_info(st, 64, 1, wc->rate);
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    st->start_time = 0;
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    if (wc->header.total_samples != 0xFFFFFFFFu)
        st->duration = wc->header.total_samples;
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    if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
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        int64_t cur = avio_tell(s->pb);
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        wc->apetag_start = ff_ape_parse_tag(s);
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        if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
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            ff_id3v1_read(s);
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        avio_seek(s->pb, cur, SEEK_SET);
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    }

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    return 0;
}

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static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
    WVContext *wc = s->priv_data;
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    int ret;
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    int off;
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    int64_t pos;
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    uint32_t block_samples;
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    if (avio_feof(s->pb))
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        return AVERROR_EOF;
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    if (wc->block_parsed) {
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        if ((ret = wv_read_block_header(s, s->pb)) < 0)
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            return ret;
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    }

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    pos = wc->pos;
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    if (av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE) < 0)
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        return AVERROR(ENOMEM);
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    memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);
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    ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
    if (ret != wc->header.blocksize) {
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        av_packet_unref(pkt);
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        return AVERROR(EIO);
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    }
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    while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {
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        if ((ret = wv_read_block_header(s, s->pb)) < 0) {
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            av_packet_unref(pkt);
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            return ret;
        }

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        off = pkt->size;
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        if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {
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            av_packet_unref(pkt);
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            return ret;
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        }
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        memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);

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        ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
        if (ret != wc->header.blocksize) {
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            av_packet_unref(pkt);
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            return (ret < 0) ? ret : AVERROR_EOF;
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        }
    }
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    pkt->stream_index = 0;
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    pkt->pos          = pos;
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    wc->block_parsed  = 1;
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    pkt->pts          = wc->header.block_idx;
    block_samples     = wc->header.samples;
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    if (block_samples > INT32_MAX)
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        av_log(s, AV_LOG_WARNING,
               "Too many samples in block: %"PRIu32"\n", block_samples);
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    else
        pkt->duration = block_samples;

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    return 0;
}

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AVInputFormat ff_wv_demuxer = {
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    .name           = "wv",
    .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),
    .priv_data_size = sizeof(WVContext),
    .read_probe     = wv_probe,
    .read_header    = wv_read_header,
    .read_packet    = wv_read_packet,
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    .flags          = AVFMT_GENERIC_INDEX,
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};