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/bswap.h"
  23 #include "avformat.h"
  24
  25 // specs say that maximum block size is 1Mb
  26 #define WV_BLOCK_LIMIT 1047576
  27
  28 #define WV_EXTRA_SIZE 12
  29
  30 enum WV_FLAGS{
  31     WV_MONO   = 0x0004,
  32     WV_HYBRID = 0x0008,
  33     WV_JOINT  = 0x0010,
  34     WV_CROSSD = 0x0020,
  35     WV_HSHAPE = 0x0040,
  36     WV_FLOAT  = 0x0080,
  37     WV_INT32  = 0x0100,
  38     WV_HBR    = 0x0200,
  39     WV_HBAL   = 0x0400,
  40     WV_MCINIT = 0x0800,
  41     WV_MCEND  = 0x1000,
  42 };
  43
  44 static const int wv_rates[16] = {
  45      6000,  8000,  9600, 11025, 12000, 16000, 22050, 24000,
  46     32000, 44100, 48000, 64000, 88200, 96000, 192000, -1
  47 };
  48
  49 typedef struct{
  50     uint32_t blksize, flags;
  51     int rate, chan, bpp;
  52     uint32_t samples, soff;
  53     int block_parsed;
  54     uint8_t extra[WV_EXTRA_SIZE];
  55     int64_t pos;
  56 }WVContext;
  57
  58 static int wv_probe(AVProbeData *p)
  59 {
  60     /* check file header */
  61     if (p->buf_size <= 32)
  62         return 0;
  63     if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
  64         p->buf[2] == 'p' && p->buf[3] == 'k')
  65         return AVPROBE_SCORE_MAX;
  66     else
  67         return 0;
  68 }
  69
  70 static int wv_read_block_header(AVFormatContext *ctx, ByteIOContext *pb)
  71 {
  72     WVContext *wc = ctx->priv_data;
  73     uint32_t tag, ver;
  74     int size;
  75     int rate, bpp, chan;
  76
  77     wc->pos = url_ftell(pb);
  78     tag = get_le32(pb);
  79     if (tag != MKTAG('w', 'v', 'p', 'k'))
  80         return -1;
  81     size = get_le32(pb);
  82     if(size < 24 || size > WV_BLOCK_LIMIT){
  83         av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
  84         return -1;
  85     }
  86     wc->blksize = size;
  87     ver = get_le16(pb);
  88     if(ver < 0x402 || ver > 0x410){
  89         av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
  90         return -1;
  91     }
  92     get_byte(pb); // track no
  93     get_byte(pb); // track sub index
  94     wc->samples = get_le32(pb); // total samples in file
  95     wc->soff = get_le32(pb); // offset in samples of current block
  96     get_buffer(pb, wc->extra, WV_EXTRA_SIZE);
  97     wc->flags = AV_RL32(wc->extra + 4);
  98     //parse flags
  99     if(wc->flags & WV_FLOAT){
 100         av_log(ctx, AV_LOG_ERROR, "Floating point data is not supported\n");
 101         return -1;
 102     }
 103     if(wc->flags & WV_HYBRID){
 104         av_log(ctx, AV_LOG_ERROR, "Hybrid coding mode is not supported\n");
 105         return -1;
 106     }
 107
 108     bpp = ((wc->flags & 3) + 1) << 3;
 109     chan = 1 + !(wc->flags & WV_MONO);
 110     rate = wv_rates[(wc->flags >> 23) & 0xF];
 111     if(rate == -1){
 112         av_log(ctx, AV_LOG_ERROR, "Unknown sampling rate\n");
 113         return -1;
 114     }
 115     if(!wc->bpp) wc->bpp = bpp;
 116     if(!wc->chan) wc->chan = chan;
 117     if(!wc->rate) wc->rate = rate;
 118
 119     if(wc->flags && bpp != wc->bpp){
 120         av_log(ctx, AV_LOG_ERROR, "Bits per sample differ, this block: %i, header block: %i\n", bpp, wc->bpp);
 121         return -1;
 122     }
 123     if(wc->flags && chan != wc->chan){
 124         av_log(ctx, AV_LOG_ERROR, "Channels differ, this block: %i, header block: %i\n", chan, wc->chan);
 125         return -1;
 126     }
 127     if(wc->flags && rate != wc->rate){
 128         av_log(ctx, AV_LOG_ERROR, "Sampling rate differ, this block: %i, header block: %i\n", rate, wc->rate);
 129         return -1;
 130     }
 131     wc->blksize = size - 24;
 132     return 0;
 133 }
 134
 135 static int wv_read_header(AVFormatContext *s,
 136                           AVFormatParameters *ap)
 137 {
 138     ByteIOContext *pb = s->pb;
 139     WVContext *wc = s->priv_data;
 140     AVStream *st;
 141
 142     if(wv_read_block_header(s, pb) < 0)
 143         return -1;
 144
 145     wc->block_parsed = 0;
 146     /* now we are ready: build format streams */
 147     st = av_new_stream(s, 0);
 148     if (!st)
 149         return -1;
 150     st->codec->codec_type = CODEC_TYPE_AUDIO;
 151     st->codec->codec_id = CODEC_ID_WAVPACK;
 152     st->codec->channels = wc->chan;
 153     st->codec->sample_rate = wc->rate;
 154     st->codec->bits_per_sample = wc->bpp;
 155     av_set_pts_info(st, 64, 1, wc->rate);
 156     s->start_time = 0;
 157     s->duration = (int64_t)wc->samples * AV_TIME_BASE / st->codec->sample_rate;
 158     return 0;
 159 }
 160
 161 static int wv_read_packet(AVFormatContext *s,
 162                           AVPacket *pkt)
 163 {
 164     WVContext *wc = s->priv_data;
 165     int ret;
 166
 167     if (url_feof(s->pb))
 168         return AVERROR(EIO);
 169     if(wc->block_parsed){
 170         if(wv_read_block_header(s, s->pb) < 0)
 171             return -1;
 172     }
 173
 174     if(av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE) < 0)
 175         return AVERROR(ENOMEM);
 176     memcpy(pkt->data, wc->extra, WV_EXTRA_SIZE);
 177     ret = get_buffer(s->pb, pkt->data + WV_EXTRA_SIZE, wc->blksize);
 178     if(ret != wc->blksize){
 179         av_free_packet(pkt);
 180         return AVERROR(EIO);
 181     }
 182     pkt->stream_index = 0;
 183     wc->block_parsed = 1;
 184     pkt->size = ret + WV_EXTRA_SIZE;
 185     pkt->pts = wc->soff;
 186     av_add_index_entry(s->streams[0], wc->pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
 187     return 0;
 188 }
 189
 190 static int wv_read_close(AVFormatContext *s)
 191 {
 192     return 0;
 193 }
 194
 195 static int wv_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
 196 {
 197     AVStream *st = s->streams[stream_index];
 198     WVContext *wc = s->priv_data;
 199     AVPacket pkt1, *pkt = &pkt1;
 200     int ret;
 201     int index = av_index_search_timestamp(st, timestamp, flags);
 202     int64_t pos, pts;
 203
 204     /* if found, seek there */
 205     if (index >= 0){
 206         wc->block_parsed = 1;
 207         url_fseek(s->pb, st->index_entries[index].pos, SEEK_SET);
 208         return 0;
 209     }
 210     /* if timestamp is out of bounds, return error */
 211     if(timestamp < 0 || timestamp >= s->duration)
 212         return -1;
 213
 214     pos = url_ftell(s->pb);
 215     do{
 216         ret = av_read_frame(s, pkt);
 217         if (ret < 0){
 218             url_fseek(s->pb, pos, SEEK_SET);
 219             return -1;
 220         }
 221         pts = pkt->pts;
 222         av_free_packet(pkt);
 223     }while(pts < timestamp);
 224     return 0;
 225 }
 226
 227 AVInputFormat wv_demuxer = {
 228     "wv",
 229     "WavPack",
 230     sizeof(WVContext),
 231     wv_probe,
 232     wv_read_header,
 233     wv_read_packet,
 234     wv_read_close,
 235     wv_read_seek,
 236 };