libavformat/wv.c

   1 /*
   2  * WavPack demuxer
   3  * Copyright (c) 2006 Konstantin Shishkov
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "libavutil/intreadwrite.h"
  23 #include "avformat.h"
  24 #include "apetag.h"
  25 #include "id3v1.h"
  26
  27 // specs say that maximum block size is 1Mb
  28 #define WV_BLOCK_LIMIT 1047576
  29
  30 #define WV_EXTRA_SIZE 12
  31
  32 enum WV_FLAGS{
  33     WV_MONO   = 0x0004,
  34     WV_HYBRID = 0x0008,
  35     WV_JOINT  = 0x0010,
  36     WV_CROSSD = 0x0020,
  37     WV_HSHAPE = 0x0040,
  38     WV_FLOAT  = 0x0080,
  39     WV_INT32  = 0x0100,
  40     WV_HBR    = 0x0200,
  41     WV_HBAL   = 0x0400,
  42     WV_MCINIT = 0x0800,
  43     WV_MCEND  = 0x1000,
  44 };
  45
  46 static const int wv_rates[16] = {
  47      6000,  8000,  9600, 11025, 12000, 16000, 22050, 24000,
  48     32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
  49 };
  50
  51 typedef struct{
  52     uint32_t blksize, flags;
  53     int rate, chan, bpp;
  54     uint32_t samples, soff;
  55     int block_parsed;
  56     uint8_t extra[WV_EXTRA_SIZE];
  57     int64_t pos;
  58 }WVContext;
  59
  60 static int wv_probe(AVProbeData *p)
  61 {
  62     /* check file header */
  63     if (p->buf_size <= 32)
  64         return 0;
  65     if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
  66         p->buf[2] == 'p' && p->buf[3] == 'k')
  67         return AVPROBE_SCORE_MAX;
  68     else
  69         return 0;
  70 }
  71
  72 static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
  73 {
  74     WVContext *wc = ctx->priv_data;
  75     uint32_t tag, ver;
  76     int size;
  77     int rate, bpp, chan;
  78
  79     wc->pos = url_ftell(pb);
  80     tag = get_le32(pb);
  81     if (tag != MKTAG('w', 'v', 'p', 'k'))
  82         return -1;
  83     size = get_le32(pb);
  84     if(size < 24 || size > WV_BLOCK_LIMIT){
  85         av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
  86         return -1;
  87     }
  88     wc->blksize = size;
  89     ver = get_le16(pb);
  90     if(ver < 0x402 || ver > 0x410){
  91         av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
  92         return -1;
  93     }
  94     get_byte(pb); // track no
  95     get_byte(pb); // track sub index
  96     wc->samples = get_le32(pb); // total samples in file
  97     wc->soff = get_le32(pb); // offset in samples of current block
  98     get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
  99     wc->flags = AV_RL32(wc->extra + 4);
 100     //parse flags
 101     bpp = ((wc->flags & 3) + 1) << 3;
 102     chan = 1 + !(wc->flags & WV_MONO);
 103     rate = wv_rates[(wc->flags >> 23) & 0xF];
 104     if(rate == -1 && !wc->block_parsed){
 105         int64_t block_end = url_ftell(pb) + wc->blksize - 24;
 106         if(url_is_streamed(pb)){
 107             av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
 108             return -1;
 109         }
 110         while(url_ftell(pb) < block_end){
 111             int id, size;
 112             id = get_byte(pb);
 113             size = (id & 0x80) ? get_le24(pb) : get_byte(pb);
 114             size <<= 1;
 115             if(id&0x40)
 116                 size--;
 117             if((id&0x3F) == 0x27){
 118                 rate = get_le24(pb);
 119                 break;
 120             }else{
 121                 url_fskip(pb, size);
 122             }
 123         }
 124         if(rate == -1){
 125             av_log(ctx, AV_LOG_ERROR, "Cannot determine custom sampling rate\n");
 126             return -1;
 127         }
 128         url_fseek(pb, block_end - wc->blksize + 24, SEEK_SET);
 129     }
 130     if(!wc->bpp) wc->bpp = bpp;
 131     if(!wc->chan) wc->chan = chan;
 132     if(!wc->rate) wc->rate = rate;
 133
 134     if(wc->flags && bpp != wc->bpp){
 135         av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
 136         return -1;
 137     }
 138     if(wc->flags && chan != wc->chan){
 139         av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
 140         return -1;
 141     }
 142     if(wc->flags && rate != -1 && rate != wc->rate){
 143         av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
 144         return -1;
 145     }
 146     wc->blksize = size - 24;
 147     return 0;
 148 }
 149
 150 static int wv_read_header(AVFormatContext *s,
 151                           AVFormatParameters *ap)
 152 {
 153     ByteIOContext *pb = s->pb;
 154     WVContext *wc = s->priv_data;
 155     AVStream *st;
 156
 157     wc->block_parsed = 0;
 158     if(wv_read_block_header(s, pb) < 0)
 159         return -1;
 160
 161     /* now we are ready: build format streams */
 162     st = av_new_stream(s, 0);
 163     if (!st)
 164         return -1;
 165     st->codec->codec_type = CODEC_TYPE_AUDIO;
 166     st->codec->codec_id = CODEC_ID_WAVPACK;
 167     st->codec->channels = wc->chan;
 168     st->codec->sample_rate = wc->rate;
 169     st->codec->bits_per_coded_sample = wc->bpp;
 170     av_set_pts_info(st, 64, 1, wc->rate);
 171     s->start_time = 0;
 172     s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
 173
 174     if(!url_is_streamed(s->pb)) {
 175         int64_t cur = url_ftell(s->pb);
 176         ff_ape_parse_tag(s);
 177         if(!av_metadata_get(s->metadata, "", NULL, AV_METADATA_IGNORE_SUFFIX))
 178             ff_id3v1_read(s);
 179         url_fseek(s->pb, cur, SEEK_SET);
 180     }
 181
 182     return 0;
 183 }
 184
 185 static int wv_read_packet(AVFormatContext *s,
 186                           AVPacket *pkt)
 187 {
 188     WVContext *wc = s->priv_data;
 189     int ret;
 190
 191     if (url_feof(s->pb))
 192         return AVERROR(EIO);
 193     if(wc->block_parsed){
 194         if(wv_read_block_header(s, s->pb) < 0)
 195             return -1;
 196     }
 197
 198     if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
 199         return AVERROR(ENOMEM);
 200     memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
 201     ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
 202     if(ret != wc->blksize){
 203         av_free_packet(pkt);
 204         return AVERROR(EIO);
 205     }
 206     pkt->stream_index = 0;
 207     wc->block_parsed = 1;
 208     pkt->size = ret + WV_EXTRA_SIZE;
 209     pkt->pts = wc->soff;
 210     av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
 211     return 0;
 212 }
 213
 214 static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 215 {
 216     AVStream *st = s->streams[stream_index];
 217     WVContext *wc = s->priv_data;
 218     AVPacket pkt1, *pkt = &pkt1;
 219     int ret;
 220     int index = av_index_search_timestamp(st, timestamp, flags);
 221     int64_t pos, pts;
 222
 223     /* if found, seek there */
 224     if (index >= 0){
 225         wc->block_parsed = 1;
 226         url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
 227         return 0;
 228     }
 229     /* if timestamp is out of bounds, return error */
 230     if(timestamp < 0 || timestamp >= s->duration)
 231         return -1;
 232
 233     pos = url_ftell(s->pb);
 234     do{
 235         ret = av_read_frame(s, pkt);
 236         if (ret < 0){
 237             url_fseek(s->pb, pos, SEEK_SET);
 238             return -1;
 239         }
 240         pts = pkt->pts;
 241         av_free_packet(pkt);
 242     }while(pts < timestamp);
 243     return 0;
 244 }
 245
 246 AVInputFormat wv_demuxer = {
 247     "wv",
 248     NULL_IF_CONFIG_SMALL("WavPack"),
 249     sizeof(WVContext),
 250     wv_probe,
 251     wv_read_header,
 252     wv_read_packet,
 253     NULL,
 254     wv_read_seek,
 255 };