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ffmpeg / libavformat / wv.c @ e356fc57

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/*
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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.
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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 "libavutil/audioconvert.h"
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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#include "apetag.h"
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#include "id3v1.h"
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// specs say that maximum block size is 1Mb
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#define WV_BLOCK_LIMIT 1047576
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#define WV_EXTRA_SIZE 12
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#define WV_START_BLOCK  0x0800
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#define WV_END_BLOCK    0x1000
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#define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
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enum WV_FLAGS{
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    WV_MONO   = 0x0004,
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    WV_HYBRID = 0x0008,
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    WV_JOINT  = 0x0010,
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    WV_CROSSD = 0x0020,
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    WV_HSHAPE = 0x0040,
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    WV_FLOAT  = 0x0080,
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    WV_INT32  = 0x0100,
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    WV_HBR    = 0x0200,
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    WV_HBAL   = 0x0400,
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    WV_MCINIT = 0x0800,
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    WV_MCEND  = 0x1000,
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};
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static const int wv_rates[16] = {
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     6000,  8000,  9600, 11025, 12000, 16000, 22050, 24000,
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    32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
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};
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typedef struct{
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    uint32_t blksize, flags;
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    int rate, chan, bpp;
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    uint32_t chmask;
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    uint32_t samples, soff;
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    int multichannel;
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    int block_parsed;
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    uint8_t extra[WV_EXTRA_SIZE];
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    int64_t pos;
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}WVContext;
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static int wv_probe(AVProbeData *p)
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{
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    /* check file header */
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    if (p->buf_size <= 32)
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        return 0;
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    if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
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        p->buf[2] == 'p' && p->buf[3] == 'k')
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        return AVPROBE_SCORE_MAX;
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    else
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        return 0;
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}
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static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb, int append)
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{
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    WVContext *wc = ctx->priv_data;
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    uint32_t tag, ver;
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    int size;
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    int rate, bpp, chan;
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    uint32_t chmask;
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    wc->pos = url_ftell(pb);
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    if(!append){
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        tag = avio_rl32(pb);
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        if (tag != MKTAG('w', 'v', 'p', 'k'))
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            return -1;
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        size = avio_rl32(pb);
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        if(size < 24 || size > WV_BLOCK_LIMIT){
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            av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
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            return -1;
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        }
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        wc->blksize = size;
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        ver = avio_rl16(pb);
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        if(ver < 0x402 || ver > 0x410){
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            av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
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            return -1;
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        }
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        avio_r8(pb); // track no
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        avio_r8(pb); // track sub index
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        wc->samples = avio_rl32(pb); // total samples in file
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        wc->soff = avio_rl32(pb); // offset in samples of current block
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        avio_read(pb, wc->extra, WV_EXTRA_SIZE);
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    }else{
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        size = wc->blksize;
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    }
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    wc->flags = AV_RL32(wc->extra + 4);
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    //parse flags
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    bpp = ((wc->flags & 3) + 1) << 3;
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    chan = 1 + !(wc->flags & WV_MONO);
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    chmask = wc->flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
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    rate = wv_rates[(wc->flags >> 23) & 0xF];
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    wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
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    if(wc->multichannel){
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        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 = url_ftell(pb) + wc->blksize - 24;
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        if(url_is_streamed(pb)){
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            av_log(ctx, AV_LOG_ERROR, "Cannot determine additional parameters\n");
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            return -1;
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        }
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        while(url_ftell(pb) < block_end){
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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){
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                    av_log(ctx, AV_LOG_ERROR, "Insufficient channel information\n");
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                    return -1;
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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;
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                case 1:
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                    chmask = avio_rl16(pb);
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                    break;
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                case 2:
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                    chmask = avio_rl24(pb);
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                    break;
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                case 3:
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                    chmask = avio_rl32(pb);
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                    break;
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                case 5:
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                    avio_seek(pb, 1, SEEK_CUR);
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                    chan |= (avio_r8(pb) & 0xF) << 8;
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                    chmask = avio_rl24(pb);
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                    break;
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                default:
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                    av_log(ctx, AV_LOG_ERROR, "Invalid channel info size %d\n", size);
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                    return -1;
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                }
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                break;
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            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_seek(pb, size, SEEK_CUR);
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            }
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            if(id&0x40)
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                avio_seek(pb, 1, SEEK_CUR);
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        }
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        if(rate == -1){
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            av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
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            return -1;
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        }
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        avio_seek(pb, block_end - wc->blksize + 24, SEEK_SET);
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    }
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    if(!wc->bpp) wc->bpp = bpp;
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    if(!wc->chan) wc->chan = chan;
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    if(!wc->chmask) wc->chmask = chmask;
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    if(!wc->rate) wc->rate = rate;
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    if(wc->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 -1;
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    }
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    if(wc->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 -1;
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    }
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    if(wc->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 -1;
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    }
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    wc->blksize = size - 24;
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    return 0;
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}
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static int wv_read_header(AVFormatContext *s,
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                          AVFormatParameters *ap)
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{
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    AVIOContext *pb = s->pb;
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    WVContext *wc = s->priv_data;
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    AVStream *st;
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    wc->block_parsed = 0;
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    if(wv_read_block_header(s, pb, 0) < 0)
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        return -1;
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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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    st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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    st->codec->codec_id = CODEC_ID_WAVPACK;
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    st->codec->channels = wc->chan;
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    st->codec->channel_layout = wc->chmask;
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    st->codec->sample_rate = wc->rate;
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    st->codec->bits_per_coded_sample = wc->bpp;
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    av_set_pts_info(st, 64, 1, wc->rate);
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    st->start_time = 0;
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    st->duration = wc->samples;
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    if(!url_is_streamed(s->pb)) {
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        int64_t cur = url_ftell(s->pb);
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        ff_ape_parse_tag(s);
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        if(!av_metadata_get(s->metadata, "", NULL, AV_METADATA_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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}
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static int wv_read_packet(AVFormatContext *s,
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                          AVPacket *pkt)
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{
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    WVContext *wc = s->priv_data;
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    int ret;
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    int size, ver, off;
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    if (url_feof(s->pb))
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        return AVERROR(EIO);
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    if(wc->block_parsed){
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        if(wv_read_block_header(s, s->pb, 0) < 0)
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            return -1;
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    }
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    off = wc->multichannel ? 4 : 0;
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    if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0)
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        return AVERROR(ENOMEM);
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    if(wc->multichannel)
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        AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12);
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    memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE);
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    ret = avio_read(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize);
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    if(ret != wc->blksize){
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        av_free_packet(pkt);
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        return AVERROR(EIO);
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    }
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    while(!(wc->flags & WV_END_BLOCK)){
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        if(avio_rl32(s->pb) != MKTAG('w', 'v', 'p', 'k')){
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            av_free_packet(pkt);
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            return -1;
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        }
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        if((ret = av_append_packet(s->pb, pkt, 4)) < 0){
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            av_free_packet(pkt);
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            return ret;
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        }
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        size = AV_RL32(pkt->data + pkt->size - 4);
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        if(size < 24 || size > WV_BLOCK_LIMIT){
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            av_free_packet(pkt);
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            av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size);
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            return -1;
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        }
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        wc->blksize = size;
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        ver = avio_rl16(s->pb);
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        if(ver < 0x402 || ver > 0x410){
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            av_free_packet(pkt);
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            av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
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            return -1;
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        }
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        avio_r8(s->pb); // track no
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        avio_r8(s->pb); // track sub index
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        wc->samples = avio_rl32(s->pb); // total samples in file
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        wc->soff = avio_rl32(s->pb); // offset in samples of current block
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        if((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0){
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            av_free_packet(pkt);
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            return ret;
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        }
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        memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE);
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        if(wv_read_block_header(s, s->pb, 1) < 0){
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            av_free_packet(pkt);
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            return -1;
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        }
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        ret = av_append_packet(s->pb, pkt, wc->blksize);
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        if(ret < 0){
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            av_free_packet(pkt);
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            return ret;
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        }
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    }
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    pkt->stream_index = 0;
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    wc->block_parsed = 1;
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    pkt->pts = wc->soff;
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    av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
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    return 0;
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}
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static int wv_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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    WVContext *wc = s->priv_data;
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    AVPacket pkt1, *pkt = &pkt1;
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    int ret;
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    int index = av_index_search_timestamp(st, timestamp, flags);
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    int64_t pos, pts;
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    /* if found, seek there */
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    if (index >= 0){
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        wc->block_parsed = 1;
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        avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
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        return 0;
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    }
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    /* if timestamp is out of bounds, return error */
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    if(timestamp < 0 || timestamp >= s->duration)
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        return -1;
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    pos = url_ftell(s->pb);
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    do{
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        ret = av_read_frame(s, pkt);
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        if (ret < 0){
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            avio_seek(s->pb, pos, SEEK_SET);
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            return -1;
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        }
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        pts = pkt->pts;
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        av_free_packet(pkt);
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    }while(pts < timestamp);
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    return 0;
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}
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AVInputFormat ff_wv_demuxer = {
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    "wv",
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    NULL_IF_CONFIG_SMALL("WavPack"),
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    sizeof(WVContext),
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    wv_probe,
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    wv_read_header,
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    wv_read_packet,
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    NULL,
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    wv_read_seek,
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};