text: /*
   * WAV demuxer
   * Copyright (c) 2001, 2002 Fabrice Bellard
   *
   * Sony Wave64 demuxer
   * RF64 demuxer
   * Copyright (c) 2009 Daniel Verkamp
   *
   * BW64 demuxer
   *
   * 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 <stdint.h>
  
  #include "libavutil/avassert.h"
  #include "libavutil/dict.h"
  #include "libavutil/intreadwrite.h"
  #include "libavutil/log.h"
  #include "libavutil/mathematics.h"
  #include "libavutil/opt.h"
  #include "avformat.h"
  #include "avio.h"
  #include "avio_internal.h"
  #include "id3v2.h"
  #include "internal.h"
  #include "metadata.h"
  #include "pcm.h"
  #include "riff.h"
  #include "w64.h"
  #include "spdif.h"
  
  typedef struct WAVDemuxContext {
      const AVClass *class;
      int64_t data_end;
      int w64;
      int64_t smv_data_ofs;
      int smv_block_size;
      int smv_frames_per_jpeg;
      int smv_block;
      int smv_last_stream;
      int smv_eof;
      int audio_eof;
      int ignore_length;
      int max_size;
      int spdif;
      int smv_cur_pt;
      int smv_given_first;
      int unaligned; // e.g. if an odd number of bytes ID3 tag was prepended
      int rifx; // RIFX: integer byte order for parameters is big endian
  } WAVDemuxContext;
  
  static void set_spdif(AVFormatContext *s, WAVDemuxContext *wav)
  {
      if (CONFIG_SPDIF_DEMUXER && s->streams[0]->codecpar->codec_tag == 1) {
          enum AVCodecID codec;
          int len = 1<<16;
          int ret = ffio_ensure_seekback(s->pb, len);
  
          if (ret >= 0) {
              uint8_t *buf = av_malloc(len);
              if (!buf) {
                  ret = AVERROR(ENOMEM);
              } else {
                  int64_t pos = avio_tell(s->pb);
                  len = ret = avio_read(s->pb, buf, len);
                  if (len >= 0) {
                      ret = ff_spdif_probe(buf, len, &codec);
                      if (ret > AVPROBE_SCORE_EXTENSION) {
                          s->streams[0]->codecpar->codec_id = codec;
                          wav->spdif = 1;
                      }
                  }
                  avio_seek(s->pb, pos, SEEK_SET);
                  av_free(buf);
              }
          }
  
          if (ret < 0)
              av_log(s, AV_LOG_WARNING, "Cannot check for SPDIF\n");
      }
  }
  
  #if CONFIG_WAV_DEMUXER
  
  static int64_t next_tag(AVIOContext *pb, uint32_t *tag, int big_endian)
  {
      *tag = avio_rl32(pb);
      if (!big_endian) {
          return avio_rl32(pb);
      } else {
          return avio_rb32(pb);
      }
  }
  
  /* RIFF chunks are always at even offsets relative to where they start. */
  static int64_t wav_seek_tag(WAVDemuxContext * wav, AVIOContext *s, int64_t offset, int whence)
  {
      offset += offset < INT64_MAX && offset + wav->unaligned & 1;
  
      return avio_seek(s, offset, whence);
  }
  
  /* return the size of the found tag */
  static int64_t find_tag(WAVDemuxContext * wav, AVIOContext *pb, uint32_t tag1)
  {
      unsigned int tag;
      int64_t size;
  
      for (;;) {
          if (avio_feof(pb))
              return AVERROR_EOF;
          size = next_tag(pb, &tag, wav->rifx);
          if (tag == tag1)
              break;
          wav_seek_tag(wav, pb, size, SEEK_CUR);
      }
      return size;
  }
  
  static int wav_probe(const AVProbeData *p)
  {
      /* check file header */
      if (p->buf_size <= 32)
          return 0;
      if (!memcmp(p->buf + 8, "WAVE", 4)) {
          if (!memcmp(p->buf, "RIFF", 4) || !memcmp(p->buf, "RIFX", 4))
              /* Since the ACT demuxer has a standard WAV header at the top of
               * its own, the returned score is decreased to avoid a probe
               * conflict between ACT and WAV. */
              return AVPROBE_SCORE_MAX - 1;
          else if ((!memcmp(p->buf,      "RF64", 4) ||
                    !memcmp(p->buf,      "BW64", 4)) &&
                   !memcmp(p->buf + 12, "ds64", 4))
              return AVPROBE_SCORE_MAX;
      }
      return 0;
  }
  
  static void handle_stream_probing(AVStream *st)
  {
      if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE) {
          st->internal->request_probe = AVPROBE_SCORE_EXTENSION;
          st->probe_packets = FFMIN(st->probe_packets, 32);
      }
  }
  
  static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
  {
      AVIOContext *pb = s->pb;
      WAVDemuxContext *wav = s->priv_data;
      int ret;
  
      /* parse fmt header */
      *st = avformat_new_stream(s, NULL);
      if (!*st)
          return AVERROR(ENOMEM);
  
      ret = ff_get_wav_header(s, pb, (*st)->codecpar, size, wav->rifx);
      if (ret < 0)
          return ret;
      handle_stream_probing(*st);
  
      (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  
      avpriv_set_pts_info(*st, 64, 1, (*st)->codecpar->sample_rate);
  
      return 0;
  }
  
  static int wav_parse_xma2_tag(AVFormatContext *s, int64_t size, AVStream **st)
  {
      AVIOContext *pb = s->pb;
      int version, num_streams, i, channels = 0, ret;
  
      if (size < 36)
          return AVERROR_INVALIDDATA;
  
      *st = avformat_new_stream(s, NULL);
      if (!*st)
          return AVERROR(ENOMEM);
  
      (*st)->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
      (*st)->codecpar->codec_id   = AV_CODEC_ID_XMA2;
      (*st)->need_parsing         = AVSTREAM_PARSE_FULL_RAW;
  
      version = avio_r8(pb);
      if (version != 3 && version != 4)
          return AVERROR_INVALIDDATA;
      num_streams = avio_r8(pb);
      if (size != (32 + ((version==3)?0:8) + 4*num_streams))
          return AVERROR_INVALIDDATA;
      avio_skip(pb, 10);
      (*st)->codecpar->sample_rate = avio_rb32(pb);
      if (version == 4)
          avio_skip(pb, 8);
      avio_skip(pb, 4);
      (*st)->duration = avio_rb32(pb);
      avio_skip(pb, 8);
  
      for (i = 0; i < num_streams; i++) {
          channels += avio_r8(pb);
          avio_skip(pb, 3);
      }
      (*st)->codecpar->channels = channels;
  
      if ((*st)->codecpar->channels <= 0 || (*st)->codecpar->sample_rate <= 0)
          return AVERROR_INVALIDDATA;
  
      avpriv_set_pts_info(*st, 64, 1, (*st)->codecpar->sample_rate);
  
      avio_seek(pb, -size, SEEK_CUR);
      if ((ret = ff_get_extradata(s, (*st)->codecpar, pb, size)) < 0)
          return ret;
  
      return 0;
  }
  
  static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
                                          int length)
  {
      char temp[257];
      int ret;
  
      av_assert0(length < sizeof(temp));
      if ((ret = avio_read(s->pb, temp, length)) != length)
          return ret < 0 ? ret : AVERROR_INVALIDDATA;
  
      temp[length] = 0;
  
      if (strlen(temp))
          return av_dict_set(&s->metadata, key, temp, 0);
  
      return 0;
  }
  
  static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
  {
      char temp[131], *coding_history;
      int ret, x;
      uint64_t time_reference;
      int64_t umid_parts[8], umid_mask = 0;
  
      if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
          (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
          (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
          (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
          (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
          return ret;
  
      time_reference = avio_rl64(s->pb);
      snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
      if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
          return ret;
  
      /* check if version is >= 1, in which case an UMID may be present */
      if (avio_rl16(s->pb) >= 1) {
          for (x = 0; x < 8; x++)
              umid_mask |= umid_parts[x] = avio_rb64(s->pb);
  
          if (umid_mask) {
              /* the string formatting below is per SMPTE 330M-2004 Annex C */
              if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
                  umid_parts[6] == 0 && umid_parts[7] == 0) {
                  /* basic UMID */
                  snprintf(temp, sizeof(temp),
                           "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
                           umid_parts[0], umid_parts[1],
                           umid_parts[2], umid_parts[3]);
              } else {
                  /* extended UMID */
                  snprintf(temp, sizeof(temp),
                           "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
                           "%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
                           umid_parts[0], umid_parts[1],
                           umid_parts[2], umid_parts[3],
                           umid_parts[4], umid_parts[5],
                           umid_parts[6], umid_parts[7]);
              }
  
              if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
                  return ret;
          }
  
          avio_skip(s->pb, 190);
      } else
          avio_skip(s->pb, 254);
  
      if (size > 602) {
          /* CodingHistory present */
          size -= 602;
  
          if (!(coding_history = av_malloc(size + 1)))
              return AVERROR(ENOMEM);
  
          if ((ret = avio_read(s->pb, coding_history, size)) != size) {
              av_free(coding_history);
              return ret < 0 ? ret : AVERROR_INVALIDDATA;
          }
  
          coding_history[size] = 0;
          if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
                                 AV_DICT_DONT_STRDUP_VAL)) < 0)
              return ret;
      }
  
      return 0;
  }
  
  static const AVMetadataConv wav_metadata_conv[] = {
      { "description",      "comment"       },
      { "originator",       "encoded_by"    },
      { "origination_date", "date"          },
      { "origination_time", "creation_time" },
      { 0 },
  };
  
  /* wav input */
  static int wav_read_header(AVFormatContext *s)
  {
      int64_t size, av_uninit(data_size);
      int64_t sample_count = 0;
      int rf64 = 0, bw64 = 0;
      uint32_t tag;
      AVIOContext *pb      = s->pb;
      AVStream *st         = NULL;
      WAVDemuxContext *wav = s->priv_data;
      int ret, got_fmt = 0, got_xma2 = 0;
      int64_t next_tag_ofs, data_ofs = -1;
  
      wav->unaligned = avio_tell(s->pb) & 1;
  
      wav->smv_data_ofs = -1;
  
      /* read chunk ID */
      tag = avio_rl32(pb);
      switch (tag) {
      case MKTAG('R', 'I', 'F', 'F'):
          break;
      case MKTAG('R', 'I', 'F', 'X'):
          wav->rifx = 1;
          break;
      case MKTAG('R', 'F', '6', '4'):
          rf64 = 1;
          break;
      case MKTAG('B', 'W', '6', '4'):
          bw64 = 1;
          break;
      default:
          av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n",
                 av_fourcc2str(tag));
          return AVERROR_INVALIDDATA;
      }
  
      /* read chunk size */
      avio_rl32(pb);
  
      /* read format */
      if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
          av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
          return AVERROR_INVALIDDATA;
      }
  
      if (rf64 || bw64) {
          if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
              return AVERROR_INVALIDDATA;
          size = avio_rl32(pb);
          if (size < 24)
              return AVERROR_INVALIDDATA;
          avio_rl64(pb); /* RIFF size */
  
          data_size    = avio_rl64(pb);
          sample_count = avio_rl64(pb);
  
          if (data_size < 0 || sample_count < 0) {
              av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
                     "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
                     data_size, sample_count);
              return AVERROR_INVALIDDATA;
          }
          avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
  
      }
  
      for (;;) {
          AVStream *vst;
          size         = next_tag(pb, &tag, wav->rifx);
          next_tag_ofs = avio_tell(pb) + size;
  
          if (avio_feof(pb))
              break;
  
          switch (tag) {
          case MKTAG('f', 'm', 't', ' '):
              /* only parse the first 'fmt ' tag found */
              if (!got_xma2 && !got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {
                  return ret;
              } else if (got_fmt)
                  av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
  
              got_fmt = 1;
              break;
          case MKTAG('X', 'M', 'A', '2'):
              /* only parse the first 'XMA2' tag found */
              if (!got_fmt && !got_xma2 && (ret = wav_parse_xma2_tag(s, size, &st)) < 0) {
                  return ret;
              } else if (got_xma2)
                  av_log(s, AV_LOG_WARNING, "found more than one 'XMA2' tag\n");
  
              got_xma2 = 1;
              break;
          case MKTAG('d', 'a', 't', 'a'):
              if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) && !got_fmt && !got_xma2) {
                  av_log(s, AV_LOG_ERROR,
                         "found no 'fmt ' tag before the 'data' tag\n");
                  return AVERROR_INVALIDDATA;
              }
  
              if (rf64 || bw64) {
                  next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
              } else if (size != 0xFFFFFFFF) {
                  data_size    = size;
                  next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
              } else {
                  av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
                         "file may be invalid\n");
                  data_size    = 0;
                  next_tag_ofs = wav->data_end = INT64_MAX;
              }
  
              data_ofs = avio_tell(pb);
  
              /* don't look for footer metadata if we can't seek or if we don't
               * know where the data tag ends
               */
              if (!(pb->seekable & AVIO_SEEKABLE_NORMAL) || (!(rf64 && !bw64) && !size))
                  goto break_loop;
              break;
          case MKTAG('f', 'a', 'c', 't'):
              if (!sample_count)
                  sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));
              break;
          case MKTAG('b', 'e', 'x', 't'):
              if ((ret = wav_parse_bext_tag(s, size)) < 0)
                  return ret;
              break;
          case MKTAG('S','M','V','0'):
              if (!got_fmt) {
                  av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
                  return AVERROR_INVALIDDATA;
              }
              // SMV file, a wav file with video appended.
              if (size != MKTAG('0','2','0','0')) {
                  av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
                  goto break_loop;
              }
              av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
              wav->smv_given_first = 0;
              vst = avformat_new_stream(s, NULL);
              if (!vst)
                  return AVERROR(ENOMEM);
              avio_r8(pb);
              vst->id = 1;
              vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
              vst->codecpar->codec_id = AV_CODEC_ID_SMVJPEG;
              vst->codecpar->width  = avio_rl24(pb);
              vst->codecpar->height = avio_rl24(pb);
              if ((ret = ff_alloc_extradata(vst->codecpar, 4)) < 0) {
                  av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
                  return ret;
              }
              size = avio_rl24(pb);
              wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
              avio_rl24(pb);
              wav->smv_block_size = avio_rl24(pb);
              avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
              vst->duration = avio_rl24(pb);
              avio_rl24(pb);
              avio_rl24(pb);
              wav->smv_frames_per_jpeg = avio_rl24(pb);
              if (wav->smv_frames_per_jpeg > 65536) {
                  av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
                  return AVERROR_INVALIDDATA;
              }
              AV_WL32(vst->codecpar->extradata, wav->smv_frames_per_jpeg);
              wav->smv_cur_pt = 0;
              goto break_loop;
          case MKTAG('L', 'I', 'S', 'T'):
          case MKTAG('l', 'i', 's', 't'):
              if (size < 4) {
                  av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
                  return AVERROR_INVALIDDATA;
              }
              switch (avio_rl32(pb)) {
              case MKTAG('I', 'N', 'F', 'O'):
                  ff_read_riff_info(s, size - 4);
                  break;
              case MKTAG('a', 'd', 't', 'l'):
                  if (s->nb_chapters > 0) {
                      while (avio_tell(pb) < next_tag_ofs &&
                             !avio_feof(pb)) {
                          char cue_label[512];
                          unsigned id, sub_size;
  
                          if (avio_rl32(pb) != MKTAG('l', 'a', 'b', 'l'))
                              break;
  
                          sub_size = avio_rl32(pb);
                          if (sub_size < 5)
                              break;
                          id       = avio_rl32(pb);
                          avio_get_str(pb, sub_size - 4, cue_label, sizeof(cue_label));
                          avio_skip(pb, avio_tell(pb) & 1);
  
                          for (int i = 0; i < s->nb_chapters; i++) {
                              if (s->chapters[i]->id == id) {
                                  av_dict_set(&s->chapters[i]->metadata, "title", cue_label, 0);
                                  break;
                              }
                          }
                      }
                  }
                  break;
              }
              break;
          case MKTAG('I', 'D', '3', ' '):
          case MKTAG('i', 'd', '3', ' '): {
              ID3v2ExtraMeta *id3v2_extra_meta = NULL;
              ff_id3v2_read_dict(pb, &s->internal->id3v2_meta, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
              if (id3v2_extra_meta) {
                  ff_id3v2_parse_apic(s, id3v2_extra_meta);
                  ff_id3v2_parse_chapters(s, id3v2_extra_meta);
                  ff_id3v2_parse_priv(s, id3v2_extra_meta);
              }
              ff_id3v2_free_extra_meta(&id3v2_extra_meta);
              }
              break;
          case MKTAG('c', 'u', 'e', ' '):
              if (size >= 4 && got_fmt && st->codecpar->sample_rate > 0) {
                  AVRational tb = {1, st->codecpar->sample_rate};
                  unsigned nb_cues = avio_rl32(pb);
  
                  if (size >= nb_cues * 24LL + 4LL) {
                      for (int i = 0; i < nb_cues; i++) {
                          unsigned offset, id = avio_rl32(pb);
  
                          avio_skip(pb, 16);
                          offset = avio_rl32(pb);
  
                          if (!avpriv_new_chapter(s, id, tb, offset, AV_NOPTS_VALUE, NULL))
                              return AVERROR(ENOMEM);
                      }
                  }
              }
              break;
          }
  
          /* seek to next tag unless we know that we'll run into EOF */
          if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
              wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
              break;
          }
      }
  
  break_loop:
      if (!got_fmt && !got_xma2) {
          av_log(s, AV_LOG_ERROR, "no 'fmt ' or 'XMA2' tag found\n");
          return AVERROR_INVALIDDATA;
      }
  
      if (data_ofs < 0) {
          av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
          return AVERROR_INVALIDDATA;
      }
  
      avio_seek(pb, data_ofs, SEEK_SET);
  
      if (data_size > (INT64_MAX>>3)) {
          av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
          data_size = 0;
      }
  
      if (   st->codecpar->bit_rate > 0 && data_size > 0
          && st->codecpar->sample_rate > 0
          && sample_count > 0 && st->codecpar->channels > 1
          && sample_count % st->codecpar->channels == 0) {
          if (fabs(8.0 * data_size * st->codecpar->channels * st->codecpar->sample_rate /
              sample_count /st->codecpar->bit_rate - 1.0) < 0.3)
              sample_count /= st->codecpar->channels;
      }
  
      if (   data_size > 0 && sample_count && st->codecpar->channels
          && (data_size << 3) / sample_count / st->codecpar->channels > st->codecpar->bits_per_coded_sample  + 1) {
          av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
          sample_count = 0;
      }
  
      /* G.729 hack (for Ticket4577)
       * FIXME: Come up with cleaner, more general solution */
      if (st->codecpar->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {
          av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
          sample_count = 0;
      }
  
      if (!sample_count || av_get_exact_bits_per_sample(st->codecpar->codec_id) > 0)
          if (   st->codecpar->channels
              && data_size
              && av_get_bits_per_sample(st->codecpar->codec_id)
              && wav->data_end <= avio_size(pb))
              sample_count = (data_size << 3)
                                    /
                  (st->codecpar->channels * (uint64_t)av_get_bits_per_sample(st->codecpar->codec_id));
  
      if (sample_count)
          st->duration = sample_count;
  
      if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S32LE &&
          st->codecpar->block_align == st->codecpar->channels * 4 &&
          st->codecpar->bits_per_coded_sample == 32 &&
          st->codecpar->extradata_size == 2 &&
          AV_RL16(st->codecpar->extradata) == 1) {
          st->codecpar->codec_id = AV_CODEC_ID_PCM_F16LE;
          st->codecpar->bits_per_coded_sample = 16;
      } else if (st->codecpar->codec_id == AV_CODEC_ID_PCM_S24LE &&
                 st->codecpar->block_align == st->codecpar->channels * 4 &&
                 st->codecpar->bits_per_coded_sample == 24) {
          st->codecpar->codec_id = AV_CODEC_ID_PCM_F24LE;
      } else if (st->codecpar->codec_id == AV_CODEC_ID_XMA1 ||
                 st->codecpar->codec_id == AV_CODEC_ID_XMA2) {
          st->codecpar->block_align = 2048;
      } else if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_MS && st->codecpar->channels > 2) {
          st->codecpar->block_align *= st->codecpar->channels;
      }
  
      ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
      ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
  
      set_spdif(s, wav);
  
      return 0;
  }
  
  /**
   * Find chunk with w64 GUID by skipping over other chunks.
   * @return the size of the found chunk
   */
  static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
  {
      uint8_t guid[16];
      int64_t size;
  
      while (!avio_feof(pb)) {
          avio_read(pb, guid, 16);
          size = avio_rl64(pb);
          if (size <= 24)
              return AVERROR_INVALIDDATA;
          if (!memcmp(guid, guid1, 16))
              return size;
          avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
      }
      return AVERROR_EOF;
  }
  
  static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
  {
      int ret, size;
      int64_t left;
      AVStream *st;
      WAVDemuxContext *wav = s->priv_data;
  
      if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
          return ff_spdif_read_packet(s, pkt);
  
      if (wav->smv_data_ofs > 0) {
          int64_t audio_dts, video_dts;
  smv_retry:
          audio_dts = (int32_t)s->streams[0]->cur_dts;
          video_dts = (int32_t)s->streams[1]->cur_dts;
  
          if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
              /*We always return a video frame first to get the pixel format first*/
              wav->smv_last_stream = wav->smv_given_first ?
                  av_compare_ts(video_dts, s->streams[1]->time_base,
                                audio_dts, s->streams[0]->time_base) > 0 : 0;
              wav->smv_given_first = 1;
          }
          wav->smv_last_stream = !wav->smv_last_stream;
          wav->smv_last_stream |= wav->audio_eof;
          wav->smv_last_stream &= !wav->smv_eof;
          if (wav->smv_last_stream) {
              uint64_t old_pos = avio_tell(s->pb);
              uint64_t new_pos = wav->smv_data_ofs +
                  wav->smv_block * wav->smv_block_size;
              if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
                  ret = AVERROR_EOF;
                  goto smv_out;
              }
              size = avio_rl24(s->pb);
              ret  = av_get_packet(s->pb, pkt, size);
              if (ret < 0)
                  goto smv_out;
              pkt->pos -= 3;
              pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
              wav->smv_cur_pt++;
              if (wav->smv_frames_per_jpeg > 0)
                  wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
              if (!wav->smv_cur_pt)
                  wav->smv_block++;
  
              pkt->stream_index = 1;
  smv_out:
              avio_seek(s->pb, old_pos, SEEK_SET);
              if (ret == AVERROR_EOF) {
                  wav->smv_eof = 1;
                  goto smv_retry;
              }
              return ret;
          }
      }
  
      st = s->streams[0];
  
      left = wav->data_end - avio_tell(s->pb);
      if (wav->ignore_length)
          left = INT_MAX;
      if (left <= 0) {
          if (CONFIG_W64_DEMUXER && wav->w64)
              left = find_guid(s->pb, ff_w64_guid_data) - 24;
          else
              left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
          if (left < 0) {
              wav->audio_eof = 1;
              if (wav->smv_data_ofs > 0 && !wav->smv_eof)
                  goto smv_retry;
              return AVERROR_EOF;
          }
          wav->data_end = avio_tell(s->pb) + left;
      }
  
      size = wav->max_size;
      if (st->codecpar->block_align > 1) {
          if (size < st->codecpar->block_align)
              size = st->codecpar->block_align;
          size = (size / st->codecpar->block_align) * st->codecpar->block_align;
      }
      size = FFMIN(size, left);
      ret  = av_get_packet(s->pb, pkt, size);
      if (ret < 0)
          return ret;
      pkt->stream_index = 0;
  
      return ret;
  }
  
  static int wav_read_seek(AVFormatContext *s,
                           int stream_index, int64_t timestamp, int flags)
  {
      WAVDemuxContext *wav = s->priv_data;
      AVStream *st;
      wav->smv_eof = 0;
      wav->audio_eof = 0;
      if (wav->smv_data_ofs > 0) {
          int64_t smv_timestamp = timestamp;
          if (stream_index == 0)
              smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
          else
              timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);
          if (wav->smv_frames_per_jpeg > 0) {
              wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
              wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
          }
      }
  
      st = s->streams[0];
      switch (st->codecpar->codec_id) {
      case AV_CODEC_ID_MP2:
      case AV_CODEC_ID_MP3:
      case AV_CODEC_ID_AC3:
      case AV_CODEC_ID_DTS:
      case AV_CODEC_ID_XMA2:
          /* use generic seeking with dynamically generated indexes */
          return -1;
      default:
          break;
      }
      return ff_pcm_read_seek(s, stream_index, timestamp, flags);
  }
  
  #define OFFSET(x) offsetof(WAVDemuxContext, x)
  #define DEC AV_OPT_FLAG_DECODING_PARAM
  static const AVOption demux_options[] = {
      { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, DEC },
      { "max_size",      "max size of single packet", OFFSET(max_size), AV_OPT_TYPE_INT, { .i64 = 4096 }, 1024, 1 << 22, DEC },
      { NULL },
  };
  
  static const AVClass wav_demuxer_class = {
      .class_name = "WAV demuxer",
      .item_name  = av_default_item_name,
      .option     = demux_options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  AVInputFormat ff_wav_demuxer = {
      .name           = "wav",
      .long_name      = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
      .priv_data_size = sizeof(WAVDemuxContext),
      .read_probe     = wav_probe,
      .read_header    = wav_read_header,
      .read_packet    = wav_read_packet,
      .read_seek      = wav_read_seek,
      .flags          = AVFMT_GENERIC_INDEX,
      .codec_tag      = (const AVCodecTag * const []) { ff_codec_wav_tags,  0 },
      .priv_class     = &wav_demuxer_class,
  };
  #endif /* CONFIG_WAV_DEMUXER */
  
  #if CONFIG_W64_DEMUXER
  static int w64_probe(const AVProbeData *p)
  {
      if (p->buf_size <= 40)
          return 0;
      if (!memcmp(p->buf,      ff_w64_guid_riff, 16) &&
          !memcmp(p->buf + 24, ff_w64_guid_wave, 16))
          return AVPROBE_SCORE_MAX;
      else
          return 0;
  }
  
  static int w64_read_header(AVFormatContext *s)
  {
      int64_t size, data_ofs = 0;
      AVIOContext *pb      = s->pb;
      WAVDemuxContext *wav = s->priv_data;
      AVStream *st;
      uint8_t guid[16];
      int ret;
  
      avio_read(pb, guid, 16);
      if (memcmp(guid, ff_w64_guid_riff, 16))
          return AVERROR_INVALIDDATA;
  
      /* riff + wave + fmt + sizes */
      if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
          return AVERROR_INVALIDDATA;
  
      avio_read(pb, guid, 16);
      if (memcmp(guid, ff_w64_guid_wave, 16)) {
          av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
          return AVERROR_INVALIDDATA;
      }
  
      wav->w64 = 1;
  
      st = avformat_new_stream(s, NULL);
      if (!st)
          return AVERROR(ENOMEM);
  
      while (!avio_feof(pb)) {
          if (avio_read(pb, guid, 16) != 16)
              break;
          size = avio_rl64(pb);
          if (size <= 24 || INT64_MAX - size < avio_tell(pb))
              return AVERROR_INVALIDDATA;
  
          if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
              /* subtract chunk header size - normal wav file doesn't count it */
              ret = ff_get_wav_header(s, pb, st->codecpar, size - 24, 0);
              if (ret < 0)
                  return ret;
              avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
  
              avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
          } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
              int64_t samples;
  
              samples = avio_rl64(pb);
              if (samples > 0)
                  st->duration = samples;
              avio_skip(pb, FFALIGN(size, INT64_C(8)) - 32);
          } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
              wav->data_end = avio_tell(pb) + size - 24;
  
              data_ofs = avio_tell(pb);
              if (!(pb->seekable & AVIO_SEEKABLE_NORMAL))
                  break;
  
              avio_skip(pb, size - 24);
          } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
              int64_t start, end, cur;
              uint32_t count, chunk_size, i;
              int64_t filesize  = avio_size(s->pb);
  
              start = avio_tell(pb);
              end = start + FFALIGN(size, INT64_C(8)) - 24;
              count = avio_rl32(pb);
  
              for (i = 0; i < count; i++) {
                  char chunk_key[5], *value;
  
                  if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
                      break;
  
                  chunk_key[4] = 0;
                  avio_read(pb, chunk_key, 4);
                  chunk_size = avio_rl32(pb);
                  if (chunk_size == UINT32_MAX || (filesize >= 0 && chunk_size > filesize))
                      return AVERROR_INVALIDDATA;
  
                  value = av_mallocz(chunk_size + 1);
                  if (!value)
                      return AVERROR(ENOMEM);
  
                  ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
                  avio_skip(pb, chunk_size - ret);
  
                  av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
              }
  
              avio_skip(pb, end - avio_tell(pb));
          } else {
              av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
              avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
          }
      }
  
      if (!data_ofs)
          return AVERROR_EOF;
  
      ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
      ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
  
      handle_stream_probing(st);
      st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  
      avio_seek(pb, data_ofs, SEEK_SET);
  
      set_spdif(s, wav);
  
      return 0;
  }
  
  #define OFFSET(x) offsetof(WAVDemuxContext, x)
  #define DEC AV_OPT_FLAG_DECODING_PARAM
  static const AVOption w64_demux_options[] = {
      { "max_size", "max size of single packet", OFFSET(max_size), AV_OPT_TYPE_INT, { .i64 = 4096 }, 1024, 1 << 22, DEC },
      { NULL }
  };
  
  static const AVClass w64_demuxer_class = {
      .class_name = "W64 demuxer",
      .item_name  = av_default_item_name,
      .option     = w64_demux_options,
      .version    = LIBAVUTIL_VERSION_INT,
  };
  
  AVInputFormat ff_w64_demuxer = {
      .name           = "w64",
      .long_name      = NULL_IF_CONFIG_SMALL("Sony Wave64"),
      .priv_data_size = sizeof(WAVDemuxContext),
      .read_probe     = w64_probe,
      .read_header    = w64_read_header,
      .read_packet    = wav_read_packet,
      .read_seek      = wav_read_seek,
      .flags          = AVFMT_GENERIC_INDEX,
      .codec_tag      = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
      .priv_class     = &w64_demuxer_class,
  };
  #endif /* CONFIG_W64_DEMUXER */
  