/*
  * WavPack demuxer

  * Copyright (c) 2006,2011 Konstantin Shishkov

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * 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

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 

 #include "libavutil/channel_layout.h"

 #include "libavutil/intreadwrite.h"

 #include "libavutil/dict.h"

 #include "avformat.h"

 #include "internal.h"

 #include "apetag.h"
 #include "id3v1.h"

 #include "wv.h"

 enum WV_FLAGS {

     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] = {

      6000,  8000,  9600, 11025, 12000, 16000,  22050, 24000,
     32000, 44100, 48000, 64000, 88200, 96000, 192000,    -1

 };
 

 typedef struct {

     uint8_t block_header[WV_HEADER_SIZE];

     WvHeader header;

     int rate, chan, bpp;

     uint32_t chmask;
     int multichannel;

     int block_parsed;

     int64_t pos;

 
     int64_t apetag_start;

 } WVContext;

 
 static int wv_probe(AVProbeData *p)
 {
     /* check file header */
     if (p->buf_size <= 32)
         return 0;

     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)

         return AVPROBE_SCORE_MAX;
     else
         return 0;
 }
 

 static int wv_read_block_header(AVFormatContext *ctx, AVIOContext *pb)

 {
     WVContext *wc = ctx->priv_data;

     int ret;

     int rate, bpp, chan;

     uint32_t chmask, flags;

     wc->pos = avio_tell(pb);

 
     /* don't return bogus packets with the ape tag data */
     if (wc->apetag_start && wc->pos >= wc->apetag_start)
         return AVERROR_EOF;
 

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

     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;

     }

 
     if (wc->header.version < 0x402 || wc->header.version > 0x410) {
         av_log(ctx, AV_LOG_ERROR, "Unsupported version %03X\n", wc->header.version);

         return AVERROR_PATCHWELCOME;

     }

     /* Blocks with zero samples don't contain actual audio information
      * and should be ignored */

     if (!wc->header.samples)

         return 0;

     // parse flags

     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);

     if (wc->multichannel) {
         chan   = wc->chan;

         chmask = wc->chmask;

     }

     if ((rate == -1 || !chan) && !wc->block_parsed) {

         int64_t block_end = avio_tell(pb) + wc->header.blocksize;

         if (!pb->seekable) {
             av_log(ctx, AV_LOG_ERROR,
                    "Cannot determine additional parameters\n");

             return AVERROR_INVALIDDATA;

         }

         while (avio_tell(pb) < block_end) {

             int id, size;

             id   = avio_r8(pb);

             size = (id & 0x80) ? avio_rl24(pb) : avio_r8(pb);

             size <<= 1;

             if (id & 0x40)

                 size--;

             switch (id & 0x3F) {

             case 0xD:

                 if (size <= 1) {
                     av_log(ctx, AV_LOG_ERROR,
                            "Insufficient channel information\n");

                     return AVERROR_INVALIDDATA;

                 }

                 chan = avio_r8(pb);

                 switch (size - 2) {

                 case 0:

                     chmask = avio_r8(pb);

                     break;
                 case 1:

                     chmask = avio_rl16(pb);

                     break;
                 case 2:

                     chmask = avio_rl24(pb);

                     break;
                 case 3:

                     chmask = avio_rl32(pb);

                     break;
                 case 5:

                     avio_skip(pb, 1);

                     chan  |= (avio_r8(pb) & 0xF) << 8;

                     chmask = avio_rl24(pb);

                     break;
                 default:

                     av_log(ctx, AV_LOG_ERROR,
                            "Invalid channel info size %d\n", size);

                     return AVERROR_INVALIDDATA;

                 }
                 break;
             case 0x27:

                 rate = avio_rl24(pb);

                 break;

             default:

                 avio_skip(pb, size);

             }

             if (id & 0x40)

                 avio_skip(pb, 1);

         }

         if (rate == -1) {
             av_log(ctx, AV_LOG_ERROR,
                    "Cannot determine custom sampling rate\n");

             return AVERROR_INVALIDDATA;

         }

         avio_seek(pb, block_end - wc->header.blocksize, SEEK_SET);

     }

     if (!wc->bpp)
         wc->bpp    = bpp;
     if (!wc->chan)
         wc->chan   = chan;
     if (!wc->chmask)
         wc->chmask = chmask;
     if (!wc->rate)
         wc->rate   = rate;

     if (flags && bpp != wc->bpp) {

         av_log(ctx, AV_LOG_ERROR,
                "Bits per sample differ, this block: %i, header block: %i\n",
                bpp, wc->bpp);

         return AVERROR_INVALIDDATA;

     }

     if (flags && !wc->multichannel && chan != wc->chan) {

         av_log(ctx, AV_LOG_ERROR,
                "Channels differ, this block: %i, header block: %i\n",
                chan, wc->chan);

         return AVERROR_INVALIDDATA;

     }

     if (flags && rate != -1 && rate != wc->rate) {

         av_log(ctx, AV_LOG_ERROR,
                "Sampling rate differ, this block: %i, header block: %i\n",
                rate, wc->rate);

         return AVERROR_INVALIDDATA;

     }
     return 0;
 }
 

 static int wv_read_header(AVFormatContext *s)

 {

     AVIOContext *pb = s->pb;

     WVContext *wc = s->priv_data;
     AVStream *st;

     int ret;

     wc->block_parsed = 0;

     for (;;) {

         if ((ret = wv_read_block_header(s, pb)) < 0)

             return ret;

         if (!wc->header.samples)
             avio_skip(pb, wc->header.blocksize);

         else
             break;
     }

 
     /* now we are ready: build format streams */

     st = avformat_new_stream(s, NULL);

     if (!st)

         return AVERROR(ENOMEM);

     st->codec->codec_type            = AVMEDIA_TYPE_AUDIO;

     st->codec->codec_id              = AV_CODEC_ID_WAVPACK;

     st->codec->channels              = wc->chan;
     st->codec->channel_layout        = wc->chmask;
     st->codec->sample_rate           = wc->rate;

     st->codec->bits_per_coded_sample = wc->bpp;

     avpriv_set_pts_info(st, 64, 1, wc->rate);

     st->start_time = 0;

     if (wc->header.total_samples != 0xFFFFFFFFu)
         st->duration = wc->header.total_samples;

     if (s->pb->seekable) {

         int64_t cur = avio_tell(s->pb);

         wc->apetag_start = ff_ape_parse_tag(s);

         if (!av_dict_get(s->metadata, "", NULL, AV_DICT_IGNORE_SUFFIX))

             ff_id3v1_read(s);

         avio_seek(s->pb, cur, SEEK_SET);

     }
 

     return 0;
 }
 

 static int wv_read_packet(AVFormatContext *s, AVPacket *pkt)

 {
     WVContext *wc = s->priv_data;

     int ret;

     int off;

     int64_t pos;

     uint32_t block_samples;

     if (url_feof(s->pb))

         return AVERROR_EOF;

     if (wc->block_parsed) {

         if ((ret = wv_read_block_header(s, s->pb)) < 0)

             return ret;

     }
 

     pos = wc->pos;

     if (av_new_packet(pkt, wc->header.blocksize + WV_HEADER_SIZE) < 0)

         return AVERROR(ENOMEM);

     memcpy(pkt->data, wc->block_header, WV_HEADER_SIZE);

     ret = avio_read(s->pb, pkt->data + WV_HEADER_SIZE, wc->header.blocksize);
     if (ret != wc->header.blocksize) {

         av_free_packet(pkt);

         return AVERROR(EIO);

     }

     while (!(wc->header.flags & WV_FLAG_FINAL_BLOCK)) {

         if ((ret = wv_read_block_header(s, s->pb)) < 0) {

             av_free_packet(pkt);
             return ret;
         }
 

         off = pkt->size;

         if ((ret = av_grow_packet(pkt, WV_HEADER_SIZE + wc->header.blocksize)) < 0) {

             av_free_packet(pkt);

             return ret;

         }

         memcpy(pkt->data + off, wc->block_header, WV_HEADER_SIZE);
 

         ret = avio_read(s->pb, pkt->data + off + WV_HEADER_SIZE, wc->header.blocksize);
         if (ret != wc->header.blocksize) {

             av_free_packet(pkt);

             return (ret < 0) ? ret : AVERROR_EOF;

         }
     }

     pkt->stream_index = 0;

     wc->block_parsed  = 1;

     pkt->pts          = wc->header.block_idx;
     block_samples     = wc->header.samples;

     if (block_samples > INT32_MAX)

         av_log(s, AV_LOG_WARNING,
                "Too many samples in block: %"PRIu32"\n", block_samples);

     else
         pkt->duration = block_samples;
 

     av_add_index_entry(s->streams[0], pos, pkt->pts, 0, 0, AVINDEX_KEYFRAME);

     return 0;
 }
 

 static int wv_read_seek(AVFormatContext *s, int stream_index,
                         int64_t timestamp, int flags)

 {

     AVStream  *st = s->streams[stream_index];

     WVContext *wc = s->priv_data;
     AVPacket pkt1, *pkt = &pkt1;
     int ret;
     int index = av_index_search_timestamp(st, timestamp, flags);
     int64_t pos, pts;
 
     /* if found, seek there */

     if (index >= 0 &&
         timestamp <= st->index_entries[st->nb_index_entries - 1].timestamp) {

         wc->block_parsed = 1;

         avio_seek(s->pb, st->index_entries[index].pos, SEEK_SET);

         return 0;
     }
     /* if timestamp is out of bounds, return error */

     if (timestamp < 0 || timestamp >= s->duration)

         return AVERROR(EINVAL);

     pos = avio_tell(s->pb);

     do {

         ret = av_read_frame(s, pkt);

         if (ret < 0) {

             avio_seek(s->pb, pos, SEEK_SET);

             return ret;

         }
         pts = pkt->pts;
         av_free_packet(pkt);

     } while(pts < timestamp);

     return 0;
 }
 

 AVInputFormat ff_wv_demuxer = {

     .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,
     .read_seek      = wv_read_seek,

 };