yading@11: /*
yading@11:  * WavPack demuxer
yading@11:  * Copyright (c) 2006,2011 Konstantin Shishkov
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/dict.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "apetag.h"
yading@11: #include "id3v1.h"
yading@11: 
yading@11: // specs say that maximum block size is 1Mb
yading@11: #define WV_BLOCK_LIMIT 1047576
yading@11: 
yading@11: #define WV_EXTRA_SIZE 12
yading@11: 
yading@11: #define WV_START_BLOCK  0x0800
yading@11: #define WV_END_BLOCK    0x1000
yading@11: #define WV_SINGLE_BLOCK (WV_START_BLOCK | WV_END_BLOCK)
yading@11: 
yading@11: enum WV_FLAGS {
yading@11:     WV_MONO   = 0x0004,
yading@11:     WV_HYBRID = 0x0008,
yading@11:     WV_JOINT  = 0x0010,
yading@11:     WV_CROSSD = 0x0020,
yading@11:     WV_HSHAPE = 0x0040,
yading@11:     WV_FLOAT  = 0x0080,
yading@11:     WV_INT32  = 0x0100,
yading@11:     WV_HBR    = 0x0200,
yading@11:     WV_HBAL   = 0x0400,
yading@11:     WV_MCINIT = 0x0800,
yading@11:     WV_MCEND  = 0x1000,
yading@11: };
yading@11: 
yading@11: static const int wv_rates[16] = {
yading@11:      6000,  8000,  9600, 11025, 12000, 16000,  22050, 24000,
yading@11:     32000, 44100, 48000, 64000, 88200, 96000, 192000,    -1
yading@11: };
yading@11: 
yading@11: typedef struct {
yading@11:     uint32_t blksize, flags;
yading@11:     int rate, chan, bpp;
yading@11:     uint32_t chmask;
yading@11:     uint32_t samples, soff;
yading@11:     int multichannel;
yading@11:     int block_parsed;
yading@11:     uint8_t extra[WV_EXTRA_SIZE];
yading@11:     int64_t pos;
yading@11: 
yading@11:     int64_t apetag_start;
yading@11: } WVContext;
yading@11: 
yading@11: static int wv_probe(AVProbeData *p)
yading@11: {
yading@11:     /* check file header */
yading@11:     if (p->buf_size <= 32)
yading@11:         return 0;
yading@11:     if (p->buf[0] == 'w' && p->buf[1] == 'v' &&
yading@11:         p->buf[2] == 'p' && p->buf[3] == 'k')
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     else
yading@11:         return 0;
yading@11: }
yading@11: 
yading@11: static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb,
yading@11:                                 int append)
yading@11: {
yading@11:     WVContext *wc = ctx->priv_data;
yading@11:     uint32_t tag, ver;
yading@11:     int size;
yading@11:     int rate, bpp, chan;
yading@11:     uint32_t chmask;
yading@11: 
yading@11:     wc->pos = avio_tell(pb);
yading@11: 
yading@11:     /* don't return bogus packets with the ape tag data */
yading@11:     if (wc->apetag_start && wc->pos >= wc->apetag_start)
yading@11:         return AVERROR_EOF;
yading@11: 
yading@11:     if (!append) {
yading@11:         tag = avio_rl32(pb);
yading@11:         if (tag != MKTAG('w', 'v', 'p', 'k'))
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         size = avio_rl32(pb);
yading@11:         if (size < 24 || size > WV_BLOCK_LIMIT) {
yading@11:             av_log(ctx, AV_LOG_ERROR, "Incorrect block size %i\n", size);
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         wc->blksize = size;
yading@11:         ver = avio_rl16(pb);
yading@11:         if (ver < 0x402 || ver > 0x410) {
yading@11:             av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
yading@11:             return AVERROR_PATCHWELCOME;
yading@11:         }
yading@11:         avio_r8(pb); // track no
yading@11:         avio_r8(pb); // track sub index
yading@11:         wc->samples = avio_rl32(pb); // total samples in file
yading@11:         wc->soff    = avio_rl32(pb); // offset in samples of current block
yading@11:         avio_read(pb, wc->extra, WV_EXTRA_SIZE);
yading@11:     } else {
yading@11:         size = wc->blksize;
yading@11:     }
yading@11:     wc->flags = AV_RL32(wc->extra + 4);
yading@11:     /* Blocks with zero samples don't contain actual audio information
yading@11:      * and should be ignored */
yading@11:     if (!AV_RN32(wc->extra))
yading@11:         return 0;
yading@11:     // parse flags
yading@11:     bpp    = ((wc->flags & 3) + 1) << 3;
yading@11:     chan   = 1 + !(wc->flags & WV_MONO);
yading@11:     chmask = wc->flags & WV_MONO ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
yading@11:     rate   = wv_rates[(wc->flags >> 23) & 0xF];
yading@11:     wc->multichannel = !!((wc->flags & WV_SINGLE_BLOCK) != WV_SINGLE_BLOCK);
yading@11:     if (wc->multichannel) {
yading@11:         chan   = wc->chan;
yading@11:         chmask = wc->chmask;
yading@11:     }
yading@11:     if ((rate == -1 || !chan) && !wc->block_parsed) {
yading@11:         int64_t block_end = avio_tell(pb) + wc->blksize - 24;
yading@11:         if (!pb->seekable) {
yading@11:             av_log(ctx, AV_LOG_ERROR,
yading@11:                    "Cannot determine additional parameters\n");
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         while (avio_tell(pb) < block_end) {
yading@11:             int id, size;
yading@11:             id   = avio_r8(pb);
yading@11:             size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);
yading@11:             size <<= 1;
yading@11:             if (id & 0x40)
yading@11:                 size--;
yading@11:             switch (id & 0x3F) {
yading@11:             case 0xD:
yading@11:                 if (size <= 1) {
yading@11:                     av_log(ctx, AV_LOG_ERROR,
yading@11:                            "Insufficient channel information\n");
yading@11:                     return AVERROR_INVALIDDATA;
yading@11:                 }
yading@11:                 chan = avio_r8(pb);
yading@11:                 switch (size - 2) {
yading@11:                 case 0:
yading@11:                     chmask = avio_r8(pb);
yading@11:                     break;
yading@11:                 case 1:
yading@11:                     chmask = avio_rl16(pb);
yading@11:                     break;
yading@11:                 case 2:
yading@11:                     chmask = avio_rl24(pb);
yading@11:                     break;
yading@11:                 case 3:
yading@11:                     chmask = avio_rl32(pb);
yading@11:                     break;
yading@11:                 case 5:
yading@11:                     avio_skip(pb, 1);
yading@11:                     chan  |= (avio_r8(pb) & 0xF) << 8;
yading@11:                     chmask = avio_rl24(pb);
yading@11:                     break;
yading@11:                 default:
yading@11:                     av_log(ctx, AV_LOG_ERROR,
yading@11:                            "Invalid channel info size %d\n", size);
yading@11:                     return AVERROR_INVALIDDATA;
yading@11:                 }
yading@11:                 break;
yading@11:             case 0x27:
yading@11:                 rate = avio_rl24(pb);
yading@11:                 break;
yading@11:             default:
yading@11:                 avio_skip(pb, size);
yading@11:             }
yading@11:             if (id & 0x40)
yading@11:                 avio_skip(pb, 1);
yading@11:         }
yading@11:         if (rate == -1) {
yading@11:             av_log(ctx, AV_LOG_ERROR,
yading@11:                    "Cannot determine custom sampling rate\n");
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         avio_seek(pb, block_end - wc->blksize + 24, SEEK_SET);
yading@11:     }
yading@11:     if (!wc->bpp)
yading@11:         wc->bpp    = bpp;
yading@11:     if (!wc->chan)
yading@11:         wc->chan   = chan;
yading@11:     if (!wc->chmask)
yading@11:         wc->chmask = chmask;
yading@11:     if (!wc->rate)
yading@11:         wc->rate   = rate;
yading@11: 
yading@11:     if (wc->flags && bpp != wc->bpp) {
yading@11:         av_log(ctx, AV_LOG_ERROR,
yading@11:                "Bits per sample differ, this block: %i, header block: %i\n",
yading@11:                bpp, wc->bpp);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     if (wc->flags && !wc->multichannel && chan != wc->chan) {
yading@11:         av_log(ctx, AV_LOG_ERROR,
yading@11:                "Channels differ, this block: %i, header block: %i\n",
yading@11:                chan, wc->chan);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     if (wc->flags && rate != -1 && rate != wc->rate) {
yading@11:         av_log(ctx, AV_LOG_ERROR,
yading@11:                "Sampling rate differ, this block: %i, header block: %i\n",
yading@11:                rate, wc->rate);
yading@11:         return AVERROR_INVALIDDATA;
yading@11:     }
yading@11:     wc->blksize = size - 24;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int wv_read_header(AVFormatContext *s)
yading@11: {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     WVContext *wc = s->priv_data;
yading@11:     AVStream *st;
yading@11:     int ret;
yading@11: 
yading@11:     wc->block_parsed = 0;
yading@11:     for (;;) {
yading@11:         if ((ret = wv_read_block_header(s, pb, 0)) < 0)
yading@11:             return ret;
yading@11:         if (!AV_RN32(wc->extra))
yading@11:             avio_skip(pb, wc->blksize - 24);
yading@11:         else
yading@11:             break;
yading@11:     }
yading@11: 
yading@11:     /* now we are ready: build format streams */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return AVERROR(ENOMEM);
yading@11:     st->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_id              = AV_CODEC_ID_WAVPACK;
yading@11:     st->codec->channels              = wc->chan;
yading@11:     st->codec->channel_layout        = wc->chmask;
yading@11:     st->codec->sample_rate           = wc->rate;
yading@11:     st->codec->bits_per_coded_sample = wc->bpp;
yading@11:     avpriv_set_pts_info(st, 64, 1, wc->rate);
yading@11:     st->start_time = 0;
yading@11:     if (wc->samples != 0xFFFFFFFFu)
yading@11:         st->duration = wc->samples;
yading@11: 
yading@11:     if (s->pb->seekable) {
yading@11:         int64_t cur = avio_tell(s->pb);
yading@11:         wc->apetag_start = ff_ape_parse_tag(s);
yading@11:         if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))
yading@11:             ff_id3v1_read(s);
yading@11:         avio_seek(s->pb, cur, SEEK_SET);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     WVContext *wc = s->priv_data;
yading@11:     int ret;
yading@11:     int size, ver, off;
yading@11:     int64_t pos;
yading@11:     uint32_t block_samples;
yading@11: 
yading@11:     if (url_feof(s->pb))
yading@11:         return AVERROR_EOF;
yading@11:     if (wc->block_parsed) {
yading@11:         if ((ret = wv_read_block_header(s, s->pb, 0)) < 0)
yading@11:             return ret;
yading@11:     }
yading@11: 
yading@11:     pos = wc->pos;
yading@11:     off = wc->multichannel ? 4 : 0;
yading@11:     if (av_new_packet(pkt, wc->blksize + WV_EXTRA_SIZE + off) < 0)
yading@11:         return AVERROR(ENOMEM);
yading@11:     if (wc->multichannel)
yading@11:         AV_WL32(pkt->data, wc->blksize + WV_EXTRA_SIZE + 12);
yading@11:     memcpy(pkt->data + off, wc->extra, WV_EXTRA_SIZE);
yading@11:     ret = avio_read(s->pb, pkt->data + WV_EXTRA_SIZE + off, wc->blksize);
yading@11:     if (ret != wc->blksize) {
yading@11:         av_free_packet(pkt);
yading@11:         return AVERROR(EIO);
yading@11:     }
yading@11:     while (!(wc->flags & WV_END_BLOCK)) {
yading@11:         if (avio_rl32(s->pb) != MKTAG('w', 'v', 'p', 'k')) {
yading@11:             av_free_packet(pkt);
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         if ((ret = av_append_packet(s->pb, pkt, 4)) < 0) {
yading@11:             av_free_packet(pkt);
yading@11:             return ret;
yading@11:         }
yading@11:         size = AV_RL32(pkt->data + pkt->size - 4);
yading@11:         if (size < 24 || size > WV_BLOCK_LIMIT) {
yading@11:             av_free_packet(pkt);
yading@11:             av_log(s, AV_LOG_ERROR, "Incorrect block size %d\n", size);
yading@11:             return AVERROR_INVALIDDATA;
yading@11:         }
yading@11:         wc->blksize = size;
yading@11:         ver         = avio_rl16(s->pb);
yading@11:         if (ver < 0x402 || ver > 0x410) {
yading@11:             av_free_packet(pkt);
yading@11:             av_log(s, AV_LOG_ERROR, "Unsupported version %03X\n", ver);
yading@11:             return AVERROR_PATCHWELCOME;
yading@11:         }
yading@11:         avio_r8(s->pb); // track no
yading@11:         avio_r8(s->pb); // track sub index
yading@11:         wc->samples = avio_rl32(s->pb); // total samples in file
yading@11:         wc->soff    = avio_rl32(s->pb); // offset in samples of current block
yading@11:         if ((ret = av_append_packet(s->pb, pkt, WV_EXTRA_SIZE)) < 0) {
yading@11:             av_free_packet(pkt);
yading@11:             return ret;
yading@11:         }
yading@11:         memcpy(wc->extra, pkt->data + pkt->size - WV_EXTRA_SIZE, WV_EXTRA_SIZE);
yading@11: 
yading@11:         if ((ret = wv_read_block_header(s, s->pb, 1)) < 0) {
yading@11:             av_free_packet(pkt);
yading@11:             return ret;
yading@11:         }
yading@11:         ret = av_append_packet(s->pb, pkt, wc->blksize);
yading@11:         if (ret < 0) {
yading@11:             av_free_packet(pkt);
yading@11:             return ret;
yading@11:         }
yading@11:     }
yading@11:     pkt->stream_index = 0;
yading@11:     wc->block_parsed  = 1;
yading@11:     pkt->pts          = wc->soff;
yading@11:     block_samples     = AV_RL32(wc->extra);
yading@11:     if (block_samples > INT32_MAX)
yading@11:         av_log(s, AV_LOG_WARNING,
yading@11:                "Too many samples in block: %"PRIu32"\n", block_samples);
yading@11:     else
yading@11:         pkt->duration = block_samples;
yading@11: 
yading@11:     av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int wv_read_seek(AVFormatContext *s, int stream_index,
yading@11:                         int64_t timestamp, int flags)
yading@11: {
yading@11:     AVStream  *st = s->streams[stream_index];
yading@11:     WVContext *wc = s->priv_data;
yading@11:     AVPacket pkt1, *pkt = &pkt1;
yading@11:     int ret;
yading@11:     int index = av_index_search_timestamp(st, timestamp, flags);
yading@11:     int64_t pos, pts;
yading@11: 
yading@11:     /* if found, seek there */
yading@11:     if (index >= 0 &&
yading@11:         timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {
yading@11:         wc->block_parsed = 1;
yading@11:         avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);
yading@11:         return 0;
yading@11:     }
yading@11:     /* if timestamp is out of bounds, return error */
yading@11:     if (timestamp < 0 || timestamp >= s->duration)
yading@11:         return AVERROR(EINVAL);
yading@11: 
yading@11:     pos = avio_tell(s->pb);
yading@11:     do {
yading@11:         ret = av_read_frame(s, pkt);
yading@11:         if (ret < 0) {
yading@11:             avio_seek(s->pb, pos, SEEK_SET);
yading@11:             return ret;
yading@11:         }
yading@11:         pts = pkt->pts;
yading@11:         av_free_packet(pkt);
yading@11:     } while(pts < timestamp);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_wv_demuxer = {
yading@11:     .name           = "wv",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("WavPack"),
yading@11:     .priv_data_size = sizeof(WVContext),
yading@11:     .read_probe     = wv_probe,
yading@11:     .read_header    = wv_read_header,
yading@11:     .read_packet    = wv_read_packet,
yading@11:     .read_seek      = wv_read_seek,
yading@11: };