/*

  * WAV muxer and demuxer

  * Copyright (c) 2001, 2002 Fabrice Bellard

  *

  * Sony Wave64 demuxer

  * RF64 demuxer

  * Copyright (c) 2009 Daniel Verkamp
  *

  * 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/avassert.h"
 #include "libavutil/dict.h"

 #include "libavutil/log.h"

 #include "libavutil/mathematics.h"

 #include "libavutil/opt.h"

 #include "avformat.h"

 #include "internal.h"

 #include "avio_internal.h"

 #include "pcm.h"

 #include "riff.h"

 #include "avio.h"

 #include "metadata.h"

 typedef struct {

     const AVClass *class;

     int64_t data;
     int64_t data_end;

     int64_t minpts;
     int64_t maxpts;
     int last_duration;

     int w64;

     int write_bext;

     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;

 } WAVContext;
 

 #if CONFIG_WAV_MUXER

 static inline void bwf_write_bext_string(AVFormatContext *s, const char *key, int maxlen)
 {
     AVDictionaryEntry *tag;
     int len = 0;
 
     if (tag = av_dict_get(s->metadata, key, NULL, 0)) {
         len = strlen(tag->value);
         len = FFMIN(len, maxlen);
         avio_write(s->pb, tag->value, len);
     }
 
     ffio_fill(s->pb, 0, maxlen - len);
 }
 
 static void bwf_write_bext_chunk(AVFormatContext *s)
 {
     AVDictionaryEntry *tmp_tag;
     uint64_t time_reference = 0;
     int64_t bext = ff_start_tag(s->pb, "bext");
 
     bwf_write_bext_string(s, "description", 256);
     bwf_write_bext_string(s, "originator", 32);
     bwf_write_bext_string(s, "originator_reference", 32);
     bwf_write_bext_string(s, "origination_date", 10);
     bwf_write_bext_string(s, "origination_time", 8);
 
     if (tmp_tag = av_dict_get(s->metadata, "time_reference", NULL, 0))
         time_reference = strtoll(tmp_tag->value, NULL, 10);
     avio_wl64(s->pb, time_reference);
     avio_wl16(s->pb, 1);  // set version to 1
 
     if (tmp_tag = av_dict_get(s->metadata, "umid", NULL, 0)) {
         unsigned char umidpart_str[17] = {0};
         int i;
         uint64_t umidpart;
         int len = strlen(tmp_tag->value+2);
 
         for (i = 0; i < len/16; i++) {
             memcpy(umidpart_str, tmp_tag->value + 2 + (i*16), 16);
             umidpart = strtoll(umidpart_str, NULL, 16);
             avio_wb64(s->pb, umidpart);
         }
         ffio_fill(s->pb, 0, 64 - i*8);
     } else
         ffio_fill(s->pb, 0, 64); // zero UMID
 
     ffio_fill(s->pb, 0, 190); // Reserved
 
     if (tmp_tag = av_dict_get(s->metadata, "coding_history", NULL, 0))
         avio_put_str(s->pb, tmp_tag->value);
 
     ff_end_tag(s->pb, bext);
 }
 

 static int wav_write_header(AVFormatContext *s)
 {

     WAVContext *wav = s->priv_data;

     AVIOContext *pb = s->pb;

     int64_t fmt, fact;

     ffio_wfourcc(pb, "RIFF");

     avio_wl32(pb, 0); /* file length */

     ffio_wfourcc(pb, "WAVE");

 
     /* format header */

     fmt = ff_start_tag(pb, "fmt ");
     if (ff_put_wav_header(pb, s->streams[0]->codec) < 0) {

         av_log(s, AV_LOG_ERROR, "%s codec not supported in WAVE format\n",

                s->streams[0]->codec->codec ? s->streams[0]->codec->codec->name : "NONE");

         return -1;
     }

     ff_end_tag(pb, fmt);

     if (s->streams[0]->codec->codec_tag != 0x01 /* hence for all other than PCM */

         && s->pb->seekable) {

         fact = ff_start_tag(pb, "fact");

         avio_wl32(pb, 0);

         ff_end_tag(pb, fact);

     }
 

     if (wav->write_bext)
         bwf_write_bext_chunk(s);
 

     avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);

     wav->maxpts = wav->last_duration = 0;
     wav->minpts = INT64_MAX;

     /* data header */

     wav->data = ff_start_tag(pb, "data");

     avio_flush(pb);

 
     return 0;
 }
 

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

 {

     AVIOContext *pb  = s->pb;

     WAVContext    *wav = s->priv_data;

     avio_write(pb, pkt->data, pkt->size);

     if(pkt->pts != AV_NOPTS_VALUE) {

         wav->minpts        = FFMIN(wav->minpts, pkt->pts);
         wav->maxpts        = FFMAX(wav->maxpts, pkt->pts);

         wav->last_duration = pkt->duration;
     } else
         av_log(s, AV_LOG_ERROR, "wav_write_packet: NOPTS\n");

     return 0;
 }
 
 static int wav_write_trailer(AVFormatContext *s)
 {

     AVIOContext *pb  = s->pb;

     WAVContext    *wav = s->priv_data;

     int64_t file_size;

     avio_flush(pb);

     if (s->pb->seekable) {

         ff_end_tag(pb, wav->data);

 
         /* update file size */

         file_size = avio_tell(pb);

         avio_seek(pb, 4, SEEK_SET);

         avio_wl32(pb, (uint32_t)(file_size - 8));

         avio_seek(pb, file_size, SEEK_SET);

         avio_flush(pb);

 
         if(s->streams[0]->codec->codec_tag != 0x01) {
             /* Update num_samps in fact chunk */
             int number_of_samples;
             number_of_samples = av_rescale(wav->maxpts - wav->minpts + wav->last_duration,
                                            s->streams[0]->codec->sample_rate * (int64_t)s->streams[0]->time_base.num,
                                            s->streams[0]->time_base.den);

             avio_seek(pb, wav->data-12, SEEK_SET);

             avio_wl32(pb, number_of_samples);

             avio_seek(pb, file_size, SEEK_SET);

             avio_flush(pb);

         }

     }
     return 0;
 }

 #define OFFSET(x) offsetof(WAVContext, x)
 #define ENC AV_OPT_FLAG_ENCODING_PARAM
 static const AVOption options[] = {

     { "write_bext", "Write BEXT chunk.", OFFSET(write_bext), AV_OPT_TYPE_INT, { 0 }, 0, 1, ENC },

     { NULL },
 };
 
 static const AVClass wav_muxer_class = {
     .class_name = "WAV muxer",
     .item_name  = av_default_item_name,
     .option     = options,
     .version    = LIBAVUTIL_VERSION_INT,
 };
 

 AVOutputFormat ff_wav_muxer = {

     .name              = "wav",
     .long_name         = NULL_IF_CONFIG_SMALL("WAV format"),
     .mime_type         = "audio/x-wav",
     .extensions        = "wav",
     .priv_data_size    = sizeof(WAVContext),
     .audio_codec       = CODEC_ID_PCM_S16LE,
     .video_codec       = CODEC_ID_NONE,
     .write_header      = wav_write_header,
     .write_packet      = wav_write_packet,
     .write_trailer     = wav_write_trailer,

     .flags             = AVFMT_TS_NONSTRICT,

     .codec_tag         = (const AVCodecTag* const []){ ff_codec_wav_tags, 0 },
     .priv_class        = &wav_muxer_class,

 };

 #endif /* CONFIG_WAV_MUXER */

 
 #if CONFIG_WAV_DEMUXER

 static int64_t next_tag(AVIOContext *pb, uint32_t *tag)

 {

     *tag = avio_rl32(pb);
     return avio_rl32(pb);

 }
 

 /* return the size of the found tag */

 static int64_t find_tag(AVIOContext *pb, uint32_t tag1)

 {
     unsigned int tag;

     int64_t size;

     for (;;) {

         if (url_feof(pb))
             return -1;

         size = next_tag(pb, &tag);

         if (tag == tag1)
             break;

         avio_skip(pb, size);

     }
     return size;
 }
 

 static int wav_probe(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))

             /*
               Since ACT demuxer has standard WAV header at top of it's own,
               returning score is decreased to avoid probe conflict
               between ACT and WAV.
             */
             return AVPROBE_SCORE_MAX - 1;

         else if (!memcmp(p->buf,      "RF64", 4) &&
                  !memcmp(p->buf + 12, "ds64", 4))
             return AVPROBE_SCORE_MAX;
     }

     return 0;

 }
 

 static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
 {
     AVIOContext *pb = s->pb;
     int ret;
 
     /* parse fmt header */

     *st = avformat_new_stream(s, NULL);

     if (!*st)
         return AVERROR(ENOMEM);
 

     ret = ff_get_wav_header(pb, (*st)->codec, size);

     if (ret < 0)
         return ret;
     (*st)->need_parsing = AVSTREAM_PARSE_FULL;
 

     avpriv_set_pts_info(*st, 64, 1, (*st)->codec->sample_rate);

 
     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)) < 0)
         return ret;
 
     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)) < 0)
             return ret;
 
         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;

     uint32_t tag, list_type;

     AVIOContext *pb = s->pb;

     AVStream *st = NULL;

     WAVContext *wav = s->priv_data;

     int ret, got_fmt = 0;

     int64_t next_tag_ofs, data_ofs = -1;

     wav->smv_data_ofs = -1;
 

     /* check RIFF header */

     tag = avio_rl32(pb);

     rf64 = tag == MKTAG('R', 'F', '6', '4');
     if (!rf64 && tag != MKTAG('R', 'I', 'F', 'F'))

         return -1;

     avio_rl32(pb); /* file size */
     tag = avio_rl32(pb);

     if (tag != MKTAG('W', 'A', 'V', 'E'))
         return -1;

     if (rf64) {

         if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))

             return -1;

         size = avio_rl32(pb);

         if (size < 24)

             return -1;

         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);

         next_tag_ofs = avio_tell(pb) + size;

         if (url_feof(pb))

             break;
 

         switch (tag) {
         case MKTAG('f', 'm', 't', ' '):

             /* only parse the first 'fmt ' tag found */

             if (!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('d', 'a', 't', 'a'):

             if (!got_fmt) {
                 av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'data' tag\n");
                 return AVERROR_INVALIDDATA;
             }
 

             if (rf64) {
                 next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
             } else {
                 data_size = size;

                 next_tag_ofs = wav->data_end = size ? next_tag_ofs : 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 || (!rf64 && !size))

                 goto break_loop;

             break;

         case MKTAG('f','a','c','t'):

             if (!sample_count)

                 sample_count = avio_rl32(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'):
             // 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");

             vst = avformat_new_stream(s, NULL);

             if (!vst)
                 return AVERROR(ENOMEM);
             avio_r8(pb);

             vst->id = 1;

             vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
             vst->codec->codec_id = CODEC_ID_MJPEG;
             vst->codec->width  = avio_rl24(pb);
             vst->codec->height = avio_rl24(pb);
             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);
             goto break_loop;

         case MKTAG('L', 'I', 'S', 'T'):
             list_type = avio_rl32(pb);

             if (size < 4) {

                 av_log(s, AV_LOG_ERROR, "too short LIST tag\n");

                 return AVERROR_INVALIDDATA;
             }
             switch (list_type) {
             case MKTAG('I', 'N', 'F', 'O'):
                 if ((ret = ff_read_riff_info(s, size - 4)) < 0)
                     return ret;
             }
             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)) ||
             avio_seek(pb, next_tag_ofs, SEEK_SET) < 0) {
             break;
         }

     }

 break_loop:

     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 (!sample_count && st->codec->channels && av_get_bits_per_sample(st->codec->codec_id))

         sample_count = (data_size<<3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));

     if (sample_count)
         st->duration = sample_count;

 
     ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);

     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);

     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 (!url_feof(pb)) {

         avio_read(pb, guid, 16);
         size = avio_rl64(pb);

         if (size <= 24)
             return -1;
         if (!memcmp(guid, guid1, 16))
             return size;

         avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);

     }
     return -1;
 }
 
 static const uint8_t guid_data[16] = { 'd', 'a', 't', 'a',
     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 

 #define MAX_SIZE 4096
 
 static int wav_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {

     int ret, size;
     int64_t left;

     AVStream *st;

     WAVContext *wav = s->priv_data;

     if (wav->smv_data_ofs > 0) {
         int64_t audio_dts, video_dts;
 smv_retry:
         audio_dts = s->streams[0]->cur_dts;
         video_dts = s->streams[1]->cur_dts;
         if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
             audio_dts = av_rescale_q(audio_dts, s->streams[0]->time_base, AV_TIME_BASE_Q);
             video_dts = av_rescale_q(video_dts, s->streams[1]->time_base, AV_TIME_BASE_Q);
             wav->smv_last_stream = video_dts >= audio_dts;
         }
         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_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, guid_data) - 24;

         else
             left = find_tag(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 = MAX_SIZE;

     if (st->codec->block_align > 1) {
         if (size < st->codec->block_align)
             size = st->codec->block_align;
         size = (size / st->codec->block_align) * st->codec->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)

 {

     WAVContext *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);
         wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
     }

 
     st = s->streams[0];

     switch (st->codec->codec_id) {

     case CODEC_ID_MP2:
     case CODEC_ID_MP3:
     case CODEC_ID_AC3:

     case CODEC_ID_DTS:

         /* 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(WAVContext, x)
 #define DEC AV_OPT_FLAG_DECODING_PARAM
 static const AVOption demux_options[] = {
     { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_INT, { 0 }, 0, 1, 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 format"),
     .priv_data_size = sizeof(WAVContext),
     .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 const uint8_t guid_riff[16] = { 'r', 'i', 'f', 'f',
     0x2E, 0x91, 0xCF, 0x11, 0xA5, 0xD6, 0x28, 0xDB, 0x04, 0xC1, 0x00, 0x00 };
 
 static const uint8_t guid_wave[16] = { 'w', 'a', 'v', 'e',
     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 
 static const uint8_t guid_fmt [16] = { 'f', 'm', 't', ' ',
     0xF3, 0xAC, 0xD3, 0x11, 0x8C, 0xD1, 0x00, 0xC0, 0x4F, 0x8E, 0xDB, 0x8A };
 
 static int w64_probe(AVProbeData *p)
 {
     if (p->buf_size <= 40)
         return 0;
     if (!memcmp(p->buf,      guid_riff, 16) &&
         !memcmp(p->buf + 24, guid_wave, 16))
         return AVPROBE_SCORE_MAX;
     else
         return 0;
 }
 

 static int w64_read_header(AVFormatContext *s)

 {
     int64_t size;

     AVIOContext *pb  = s->pb;

     WAVContext    *wav = s->priv_data;
     AVStream *st;
     uint8_t guid[16];

     int ret;

     avio_read(pb, guid, 16);

     if (memcmp(guid, guid_riff, 16))
         return -1;
 

     if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8) /* riff + wave + fmt + sizes */

         return -1;
 

     avio_read(pb, guid, 16);

     if (memcmp(guid, guid_wave, 16)) {
         av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
         return -1;
     }
 
     size = find_guid(pb, guid_fmt);
     if (size < 0) {
         av_log(s, AV_LOG_ERROR, "could not find fmt guid\n");
         return -1;
     }
 

     st = avformat_new_stream(s, NULL);

     if (!st)
         return AVERROR(ENOMEM);
 
     /* subtract chunk header size - normal wav file doesn't count it */

     ret = ff_get_wav_header(pb, st->codec, size - 24);
     if (ret < 0)
         return ret;

     avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);

 
     st->need_parsing = AVSTREAM_PARSE_FULL;
 

     avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);

 
     size = find_guid(pb, guid_data);
     if (size < 0) {
         av_log(s, AV_LOG_ERROR, "could not find data guid\n");
         return -1;
     }

     wav->data_end = avio_tell(pb) + size - 24;

     wav->w64      = 1;
 
     return 0;
 }
 

 AVInputFormat ff_w64_demuxer = {

     .name           = "w64",
     .long_name      = NULL_IF_CONFIG_SMALL("Sony Wave64 format"),
     .priv_data_size = sizeof(WAVContext),
     .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 },

 };

 #endif /* CONFIG_W64_DEMUXER */