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  1. /*
  2.  * WAV demuxer
  3.  * Copyright (c) 2001, 2002 Fabrice Bellard
  4.  *
  5.  * Sony Wave64 demuxer
  6.  * RF64 demuxer
  7.  * Copyright (c) 2009 Daniel Verkamp
  8.  *
  9.  * This file is part of FFmpeg.
  10.  *
  11.  * FFmpeg is free software; you can redistribute it and/or
  12.  * modify it under the terms of the GNU Lesser General Public
  13.  * License as published by the Free Software Foundation; either
  14.  * version 2.1 of the License, or (at your option) any later version.
  15.  *
  16.  * FFmpeg is distributed in the hope that it will be useful,
  17.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19.  * Lesser General Public License for more details.
  20.  *
  21.  * You should have received a copy of the GNU Lesser General Public
  22.  * License along with FFmpeg; if not, write to the Free Software
  23.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  24.  */
  25.  
  26. #include <stdint.h>
  27.  
  28. #include "libavutil/avassert.h"
  29. #include "libavutil/dict.h"
  30. #include "libavutil/intreadwrite.h"
  31. #include "libavutil/log.h"
  32. #include "libavutil/mathematics.h"
  33. #include "libavutil/opt.h"
  34. #include "avformat.h"
  35. #include "avio.h"
  36. #include "avio_internal.h"
  37. #include "internal.h"
  38. #include "metadata.h"
  39. #include "pcm.h"
  40. #include "riff.h"
  41. #include "w64.h"
  42. #include "spdif.h"
  43.  
  44. typedef struct WAVDemuxContext {
  45.     const AVClass *class;
  46.     int64_t data_end;
  47.     int w64;
  48.     int64_t smv_data_ofs;
  49.     int smv_block_size;
  50.     int smv_frames_per_jpeg;
  51.     int smv_block;
  52.     int smv_last_stream;
  53.     int smv_eof;
  54.     int audio_eof;
  55.     int ignore_length;
  56.     int spdif;
  57.     int smv_cur_pt;
  58.     int smv_given_first;
  59.     int unaligned; // e.g. if an odd number of bytes ID3 tag was prepended
  60.     int rifx; // RIFX: integer byte order for parameters is big endian
  61. } WAVDemuxContext;
  62.  
  63. #if CONFIG_WAV_DEMUXER
  64.  
  65. static int64_t next_tag(AVIOContext *pb, uint32_t *tag, int big_endian)
  66. {
  67.     *tag = avio_rl32(pb);
  68.     if (!big_endian) {
  69.         return avio_rl32(pb);
  70.     } else {
  71.         return avio_rb32(pb);
  72.     }
  73. }
  74.  
  75. /* RIFF chunks are always at even offsets relative to where they start. */
  76. static int64_t wav_seek_tag(WAVDemuxContext * wav, AVIOContext *s, int64_t offset, int whence)
  77. {
  78.     offset += offset < INT64_MAX && offset + wav->unaligned & 1;
  79.  
  80.     return avio_seek(s, offset, whence);
  81. }
  82.  
  83. /* return the size of the found tag */
  84. static int64_t find_tag(WAVDemuxContext * wav, AVIOContext *pb, uint32_t tag1)
  85. {
  86.     unsigned int tag;
  87.     int64_t size;
  88.  
  89.     for (;;) {
  90.         if (avio_feof(pb))
  91.             return AVERROR_EOF;
  92.         size = next_tag(pb, &tag, wav->rifx);
  93.         if (tag == tag1)
  94.             break;
  95.         wav_seek_tag(wav, pb, size, SEEK_CUR);
  96.     }
  97.     return size;
  98. }
  99.  
  100. static int wav_probe(AVProbeData *p)
  101. {
  102.     /* check file header */
  103.     if (p->buf_size <= 32)
  104.         return 0;
  105.     if (!memcmp(p->buf + 8, "WAVE", 4)) {
  106.         if (!memcmp(p->buf, "RIFF", 4) || !memcmp(p->buf, "RIFX", 4))
  107.             /* Since the ACT demuxer has a standard WAV header at the top of
  108.              * its own, the returned score is decreased to avoid a probe
  109.              * conflict between ACT and WAV. */
  110.             return AVPROBE_SCORE_MAX - 1;
  111.         else if (!memcmp(p->buf,      "RF64", 4) &&
  112.                  !memcmp(p->buf + 12, "ds64", 4))
  113.             return AVPROBE_SCORE_MAX;
  114.     }
  115.     return 0;
  116. }
  117.  
  118. static void handle_stream_probing(AVStream *st)
  119. {
  120.     if (st->codec->codec_id == AV_CODEC_ID_PCM_S16LE) {
  121.         st->request_probe = AVPROBE_SCORE_EXTENSION;
  122.         st->probe_packets = FFMIN(st->probe_packets, 32);
  123.     }
  124. }
  125.  
  126. static int wav_parse_fmt_tag(AVFormatContext *s, int64_t size, AVStream **st)
  127. {
  128.     AVIOContext *pb = s->pb;
  129.     WAVDemuxContext *wav = s->priv_data;
  130.     int ret;
  131.  
  132.     /* parse fmt header */
  133.     *st = avformat_new_stream(s, NULL);
  134.     if (!*st)
  135.         return AVERROR(ENOMEM);
  136.  
  137.     ret = ff_get_wav_header(s, pb, (*st)->codec, size, wav->rifx);
  138.     if (ret < 0)
  139.         return ret;
  140.     handle_stream_probing(*st);
  141.  
  142.     (*st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  143.  
  144.     avpriv_set_pts_info(*st, 64, 1, (*st)->codec->sample_rate);
  145.  
  146.     return 0;
  147. }
  148.  
  149. static inline int wav_parse_bext_string(AVFormatContext *s, const char *key,
  150.                                         int length)
  151. {
  152.     char temp[257];
  153.     int ret;
  154.  
  155.     av_assert0(length <= sizeof(temp));
  156.     if ((ret = avio_read(s->pb, temp, length)) < 0)
  157.         return ret;
  158.  
  159.     temp[length] = 0;
  160.  
  161.     if (strlen(temp))
  162.         return av_dict_set(&s->metadata, key, temp, 0);
  163.  
  164.     return 0;
  165. }
  166.  
  167. static int wav_parse_bext_tag(AVFormatContext *s, int64_t size)
  168. {
  169.     char temp[131], *coding_history;
  170.     int ret, x;
  171.     uint64_t time_reference;
  172.     int64_t umid_parts[8], umid_mask = 0;
  173.  
  174.     if ((ret = wav_parse_bext_string(s, "description", 256)) < 0 ||
  175.         (ret = wav_parse_bext_string(s, "originator", 32)) < 0 ||
  176.         (ret = wav_parse_bext_string(s, "originator_reference", 32)) < 0 ||
  177.         (ret = wav_parse_bext_string(s, "origination_date", 10)) < 0 ||
  178.         (ret = wav_parse_bext_string(s, "origination_time", 8)) < 0)
  179.         return ret;
  180.  
  181.     time_reference = avio_rl64(s->pb);
  182.     snprintf(temp, sizeof(temp), "%"PRIu64, time_reference);
  183.     if ((ret = av_dict_set(&s->metadata, "time_reference", temp, 0)) < 0)
  184.         return ret;
  185.  
  186.     /* check if version is >= 1, in which case an UMID may be present */
  187.     if (avio_rl16(s->pb) >= 1) {
  188.         for (x = 0; x < 8; x++)
  189.             umid_mask |= umid_parts[x] = avio_rb64(s->pb);
  190.  
  191.         if (umid_mask) {
  192.             /* the string formatting below is per SMPTE 330M-2004 Annex C */
  193.             if (umid_parts[4] == 0 && umid_parts[5] == 0 &&
  194.                 umid_parts[6] == 0 && umid_parts[7] == 0) {
  195.                 /* basic UMID */
  196.                 snprintf(temp, sizeof(temp),
  197.                          "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
  198.                          umid_parts[0], umid_parts[1],
  199.                          umid_parts[2], umid_parts[3]);
  200.             } else {
  201.                 /* extended UMID */
  202.                 snprintf(temp, sizeof(temp),
  203.                          "0x%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64
  204.                          "%016"PRIX64"%016"PRIX64"%016"PRIX64"%016"PRIX64,
  205.                          umid_parts[0], umid_parts[1],
  206.                          umid_parts[2], umid_parts[3],
  207.                          umid_parts[4], umid_parts[5],
  208.                          umid_parts[6], umid_parts[7]);
  209.             }
  210.  
  211.             if ((ret = av_dict_set(&s->metadata, "umid", temp, 0)) < 0)
  212.                 return ret;
  213.         }
  214.  
  215.         avio_skip(s->pb, 190);
  216.     } else
  217.         avio_skip(s->pb, 254);
  218.  
  219.     if (size > 602) {
  220.         /* CodingHistory present */
  221.         size -= 602;
  222.  
  223.         if (!(coding_history = av_malloc(size + 1)))
  224.             return AVERROR(ENOMEM);
  225.  
  226.         if ((ret = avio_read(s->pb, coding_history, size)) < 0)
  227.             return ret;
  228.  
  229.         coding_history[size] = 0;
  230.         if ((ret = av_dict_set(&s->metadata, "coding_history", coding_history,
  231.                                AV_DICT_DONT_STRDUP_VAL)) < 0)
  232.             return ret;
  233.     }
  234.  
  235.     return 0;
  236. }
  237.  
  238. static const AVMetadataConv wav_metadata_conv[] = {
  239.     { "description",      "comment"       },
  240.     { "originator",       "encoded_by"    },
  241.     { "origination_date", "date"          },
  242.     { "origination_time", "creation_time" },
  243.     { 0 },
  244. };
  245.  
  246. /* wav input */
  247. static int wav_read_header(AVFormatContext *s)
  248. {
  249.     int64_t size, av_uninit(data_size);
  250.     int64_t sample_count = 0;
  251.     int rf64 = 0;
  252.     char start_code[32];
  253.     uint32_t tag;
  254.     AVIOContext *pb      = s->pb;
  255.     AVStream *st         = NULL;
  256.     WAVDemuxContext *wav = s->priv_data;
  257.     int ret, got_fmt = 0;
  258.     int64_t next_tag_ofs, data_ofs = -1;
  259.  
  260.     wav->unaligned = avio_tell(s->pb) & 1;
  261.  
  262.     wav->smv_data_ofs = -1;
  263.  
  264.     /* read chunk ID */
  265.     tag = avio_rl32(pb);
  266.     switch (tag) {
  267.     case MKTAG('R', 'I', 'F', 'F'):
  268.         break;
  269.     case MKTAG('R', 'I', 'F', 'X'):
  270.         wav->rifx = 1;
  271.         break;
  272.     case MKTAG('R', 'F', '6', '4'):
  273.         rf64 = 1;
  274.         break;
  275.     default:
  276.         av_get_codec_tag_string(start_code, sizeof(start_code), tag);
  277.         av_log(s, AV_LOG_ERROR, "invalid start code %s in RIFF header\n", start_code);
  278.         return AVERROR_INVALIDDATA;
  279.     }
  280.  
  281.     /* read chunk size */
  282.     avio_rl32(pb);
  283.  
  284.     /* read format */
  285.     if (avio_rl32(pb) != MKTAG('W', 'A', 'V', 'E')) {
  286.         av_log(s, AV_LOG_ERROR, "invalid format in RIFF header\n");
  287.         return AVERROR_INVALIDDATA;
  288.     }
  289.  
  290.     if (rf64) {
  291.         if (avio_rl32(pb) != MKTAG('d', 's', '6', '4'))
  292.             return AVERROR_INVALIDDATA;
  293.         size = avio_rl32(pb);
  294.         if (size < 24)
  295.             return AVERROR_INVALIDDATA;
  296.         avio_rl64(pb); /* RIFF size */
  297.  
  298.         data_size    = avio_rl64(pb);
  299.         sample_count = avio_rl64(pb);
  300.  
  301.         if (data_size < 0 || sample_count < 0) {
  302.             av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in "
  303.                    "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n",
  304.                    data_size, sample_count);
  305.             return AVERROR_INVALIDDATA;
  306.         }
  307.         avio_skip(pb, size - 24); /* skip rest of ds64 chunk */
  308.  
  309.     }
  310.  
  311.     for (;;) {
  312.         AVStream *vst;
  313.         size         = next_tag(pb, &tag, wav->rifx);
  314.         next_tag_ofs = avio_tell(pb) + size;
  315.  
  316.         if (avio_feof(pb))
  317.             break;
  318.  
  319.         switch (tag) {
  320.         case MKTAG('f', 'm', 't', ' '):
  321.             /* only parse the first 'fmt ' tag found */
  322.             if (!got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) {
  323.                 return ret;
  324.             } else if (got_fmt)
  325.                 av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n");
  326.  
  327.             got_fmt = 1;
  328.             break;
  329.         case MKTAG('d', 'a', 't', 'a'):
  330.             if (!got_fmt) {
  331.                 av_log(s, AV_LOG_ERROR,
  332.                        "found no 'fmt ' tag before the 'data' tag\n");
  333.                 return AVERROR_INVALIDDATA;
  334.             }
  335.  
  336.             if (rf64) {
  337.                 next_tag_ofs = wav->data_end = avio_tell(pb) + data_size;
  338.             } else if (size != 0xFFFFFFFF) {
  339.                 data_size    = size;
  340.                 next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX;
  341.             } else {
  342.                 av_log(s, AV_LOG_WARNING, "Ignoring maximum wav data size, "
  343.                        "file may be invalid\n");
  344.                 data_size    = 0;
  345.                 next_tag_ofs = wav->data_end = INT64_MAX;
  346.             }
  347.  
  348.             data_ofs = avio_tell(pb);
  349.  
  350.             /* don't look for footer metadata if we can't seek or if we don't
  351.              * know where the data tag ends
  352.              */
  353.             if (!pb->seekable || (!rf64 && !size))
  354.                 goto break_loop;
  355.             break;
  356.         case MKTAG('f', 'a', 'c', 't'):
  357.             if (!sample_count)
  358.                 sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb));
  359.             break;
  360.         case MKTAG('b', 'e', 'x', 't'):
  361.             if ((ret = wav_parse_bext_tag(s, size)) < 0)
  362.                 return ret;
  363.             break;
  364.         case MKTAG('S','M','V','0'):
  365.             if (!got_fmt) {
  366.                 av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n");
  367.                 return AVERROR_INVALIDDATA;
  368.             }
  369.             // SMV file, a wav file with video appended.
  370.             if (size != MKTAG('0','2','0','0')) {
  371.                 av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n");
  372.                 goto break_loop;
  373.             }
  374.             av_log(s, AV_LOG_DEBUG, "Found SMV data\n");
  375.             wav->smv_given_first = 0;
  376.             vst = avformat_new_stream(s, NULL);
  377.             if (!vst)
  378.                 return AVERROR(ENOMEM);
  379.             avio_r8(pb);
  380.             vst->id = 1;
  381.             vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
  382.             vst->codec->codec_id = AV_CODEC_ID_SMVJPEG;
  383.             vst->codec->width  = avio_rl24(pb);
  384.             vst->codec->height = avio_rl24(pb);
  385.             if (ff_alloc_extradata(vst->codec, 4)) {
  386.                 av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n");
  387.                 return AVERROR(ENOMEM);
  388.             }
  389.             size = avio_rl24(pb);
  390.             wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3;
  391.             avio_rl24(pb);
  392.             wav->smv_block_size = avio_rl24(pb);
  393.             avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb));
  394.             vst->duration = avio_rl24(pb);
  395.             avio_rl24(pb);
  396.             avio_rl24(pb);
  397.             wav->smv_frames_per_jpeg = avio_rl24(pb);
  398.             if (wav->smv_frames_per_jpeg > 65536) {
  399.                 av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n");
  400.                 return AVERROR_INVALIDDATA;
  401.             }
  402.             AV_WL32(vst->codec->extradata, wav->smv_frames_per_jpeg);
  403.             wav->smv_cur_pt = 0;
  404.             goto break_loop;
  405.         case MKTAG('L', 'I', 'S', 'T'):
  406.             if (size < 4) {
  407.                 av_log(s, AV_LOG_ERROR, "too short LIST tag\n");
  408.                 return AVERROR_INVALIDDATA;
  409.             }
  410.             switch (avio_rl32(pb)) {
  411.             case MKTAG('I', 'N', 'F', 'O'):
  412.                 ff_read_riff_info(s, size - 4);
  413.             }
  414.             break;
  415.         }
  416.  
  417.         /* seek to next tag unless we know that we'll run into EOF */
  418.         if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) ||
  419.             wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) {
  420.             break;
  421.         }
  422.     }
  423.  
  424. break_loop:
  425.     if (data_ofs < 0) {
  426.         av_log(s, AV_LOG_ERROR, "no 'data' tag found\n");
  427.         return AVERROR_INVALIDDATA;
  428.     }
  429.  
  430.     avio_seek(pb, data_ofs, SEEK_SET);
  431.  
  432.     if (data_size > (INT64_MAX>>3)) {
  433.         av_log(s, AV_LOG_WARNING, "Data size %"PRId64" is too large\n", data_size);
  434.         data_size = 0;
  435.     }
  436.  
  437.     if (   st->codec->bit_rate > 0 && data_size > 0
  438.         && st->codec->sample_rate > 0
  439.         && sample_count > 0 && st->codec->channels > 1
  440.         && sample_count % st->codec->channels == 0) {
  441.         if (fabs(8.0 * data_size * st->codec->channels * st->codec->sample_rate /
  442.             sample_count /st->codec->bit_rate - 1.0) < 0.3)
  443.             sample_count /= st->codec->channels;
  444.     }
  445.  
  446.     if (   data_size > 0 && sample_count && st->codec->channels
  447.         && (data_size << 3) / sample_count / st->codec->channels > st->codec->bits_per_coded_sample  + 1) {
  448.         av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
  449.         sample_count = 0;
  450.     }
  451.  
  452.     /* G.729 hack (for Ticket4577)
  453.      * FIXME: Come up with cleaner, more general solution */
  454.     if (st->codec->codec_id == AV_CODEC_ID_G729 && sample_count && (data_size << 3) > sample_count) {
  455.         av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count);
  456.         sample_count = 0;
  457.     }
  458.  
  459.     if (!sample_count || av_get_exact_bits_per_sample(st->codec->codec_id) > 0)
  460.         if (   st->codec->channels
  461.             && data_size
  462.             && av_get_bits_per_sample(st->codec->codec_id)
  463.             && wav->data_end <= avio_size(pb))
  464.             sample_count = (data_size << 3)
  465.                                   /
  466.                 (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id));
  467.  
  468.     if (sample_count)
  469.         st->duration = sample_count;
  470.  
  471.     ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
  472.     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
  473.  
  474.     return 0;
  475. }
  476.  
  477. /**
  478.  * Find chunk with w64 GUID by skipping over other chunks.
  479.  * @return the size of the found chunk
  480.  */
  481. static int64_t find_guid(AVIOContext *pb, const uint8_t guid1[16])
  482. {
  483.     uint8_t guid[16];
  484.     int64_t size;
  485.  
  486.     while (!avio_feof(pb)) {
  487.         avio_read(pb, guid, 16);
  488.         size = avio_rl64(pb);
  489.         if (size <= 24)
  490.             return AVERROR_INVALIDDATA;
  491.         if (!memcmp(guid, guid1, 16))
  492.             return size;
  493.         avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
  494.     }
  495.     return AVERROR_EOF;
  496. }
  497.  
  498. #define MAX_SIZE 4096
  499.  
  500. static int wav_read_packet(AVFormatContext *s, AVPacket *pkt)
  501. {
  502.     int ret, size;
  503.     int64_t left;
  504.     AVStream *st;
  505.     WAVDemuxContext *wav = s->priv_data;
  506.  
  507.     if (CONFIG_SPDIF_DEMUXER && wav->spdif == 0 &&
  508.         s->streams[0]->codec->codec_tag == 1) {
  509.         enum AVCodecID codec;
  510.         ret = ff_spdif_probe(s->pb->buffer, s->pb->buf_end - s->pb->buffer,
  511.                              &codec);
  512.         if (ret > AVPROBE_SCORE_EXTENSION) {
  513.             s->streams[0]->codec->codec_id = codec;
  514.             wav->spdif = 1;
  515.         } else {
  516.             wav->spdif = -1;
  517.         }
  518.     }
  519.     if (CONFIG_SPDIF_DEMUXER && wav->spdif == 1)
  520.         return ff_spdif_read_packet(s, pkt);
  521.  
  522.     if (wav->smv_data_ofs > 0) {
  523.         int64_t audio_dts, video_dts;
  524. smv_retry:
  525.         audio_dts = (int32_t)s->streams[0]->cur_dts;
  526.         video_dts = (int32_t)s->streams[1]->cur_dts;
  527.  
  528.         if (audio_dts != AV_NOPTS_VALUE && video_dts != AV_NOPTS_VALUE) {
  529.             /*We always return a video frame first to get the pixel format first*/
  530.             wav->smv_last_stream = wav->smv_given_first ?
  531.                 av_compare_ts(video_dts, s->streams[1]->time_base,
  532.                               audio_dts, s->streams[0]->time_base) > 0 : 0;
  533.             wav->smv_given_first = 1;
  534.         }
  535.         wav->smv_last_stream = !wav->smv_last_stream;
  536.         wav->smv_last_stream |= wav->audio_eof;
  537.         wav->smv_last_stream &= !wav->smv_eof;
  538.         if (wav->smv_last_stream) {
  539.             uint64_t old_pos = avio_tell(s->pb);
  540.             uint64_t new_pos = wav->smv_data_ofs +
  541.                 wav->smv_block * wav->smv_block_size;
  542.             if (avio_seek(s->pb, new_pos, SEEK_SET) < 0) {
  543.                 ret = AVERROR_EOF;
  544.                 goto smv_out;
  545.             }
  546.             size = avio_rl24(s->pb);
  547.             ret  = av_get_packet(s->pb, pkt, size);
  548.             if (ret < 0)
  549.                 goto smv_out;
  550.             pkt->pos -= 3;
  551.             pkt->pts = wav->smv_block * wav->smv_frames_per_jpeg + wav->smv_cur_pt;
  552.             wav->smv_cur_pt++;
  553.             if (wav->smv_frames_per_jpeg > 0)
  554.                 wav->smv_cur_pt %= wav->smv_frames_per_jpeg;
  555.             if (!wav->smv_cur_pt)
  556.                 wav->smv_block++;
  557.  
  558.             pkt->stream_index = 1;
  559. smv_out:
  560.             avio_seek(s->pb, old_pos, SEEK_SET);
  561.             if (ret == AVERROR_EOF) {
  562.                 wav->smv_eof = 1;
  563.                 goto smv_retry;
  564.             }
  565.             return ret;
  566.         }
  567.     }
  568.  
  569.     st = s->streams[0];
  570.  
  571.     left = wav->data_end - avio_tell(s->pb);
  572.     if (wav->ignore_length)
  573.         left = INT_MAX;
  574.     if (left <= 0) {
  575.         if (CONFIG_W64_DEMUXER && wav->w64)
  576.             left = find_guid(s->pb, ff_w64_guid_data) - 24;
  577.         else
  578.             left = find_tag(wav, s->pb, MKTAG('d', 'a', 't', 'a'));
  579.         if (left < 0) {
  580.             wav->audio_eof = 1;
  581.             if (wav->smv_data_ofs > 0 && !wav->smv_eof)
  582.                 goto smv_retry;
  583.             return AVERROR_EOF;
  584.         }
  585.         wav->data_end = avio_tell(s->pb) + left;
  586.     }
  587.  
  588.     size = MAX_SIZE;
  589.     if (st->codec->block_align > 1) {
  590.         if (size < st->codec->block_align)
  591.             size = st->codec->block_align;
  592.         size = (size / st->codec->block_align) * st->codec->block_align;
  593.     }
  594.     size = FFMIN(size, left);
  595.     ret  = av_get_packet(s->pb, pkt, size);
  596.     if (ret < 0)
  597.         return ret;
  598.     pkt->stream_index = 0;
  599.  
  600.     return ret;
  601. }
  602.  
  603. static int wav_read_seek(AVFormatContext *s,
  604.                          int stream_index, int64_t timestamp, int flags)
  605. {
  606.     WAVDemuxContext *wav = s->priv_data;
  607.     AVStream *st;
  608.     wav->smv_eof = 0;
  609.     wav->audio_eof = 0;
  610.     if (wav->smv_data_ofs > 0) {
  611.         int64_t smv_timestamp = timestamp;
  612.         if (stream_index == 0)
  613.             smv_timestamp = av_rescale_q(timestamp, s->streams[0]->time_base, s->streams[1]->time_base);
  614.         else
  615.             timestamp = av_rescale_q(smv_timestamp, s->streams[1]->time_base, s->streams[0]->time_base);
  616.         if (wav->smv_frames_per_jpeg > 0) {
  617.             wav->smv_block = smv_timestamp / wav->smv_frames_per_jpeg;
  618.             wav->smv_cur_pt = smv_timestamp % wav->smv_frames_per_jpeg;
  619.         }
  620.     }
  621.  
  622.     st = s->streams[0];
  623.     switch (st->codec->codec_id) {
  624.     case AV_CODEC_ID_MP2:
  625.     case AV_CODEC_ID_MP3:
  626.     case AV_CODEC_ID_AC3:
  627.     case AV_CODEC_ID_DTS:
  628.         /* use generic seeking with dynamically generated indexes */
  629.         return -1;
  630.     default:
  631.         break;
  632.     }
  633.     return ff_pcm_read_seek(s, stream_index, timestamp, flags);
  634. }
  635.  
  636. #define OFFSET(x) offsetof(WAVDemuxContext, x)
  637. #define DEC AV_OPT_FLAG_DECODING_PARAM
  638. static const AVOption demux_options[] = {
  639.     { "ignore_length", "Ignore length", OFFSET(ignore_length), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, DEC },
  640.     { NULL },
  641. };
  642.  
  643. static const AVClass wav_demuxer_class = {
  644.     .class_name = "WAV demuxer",
  645.     .item_name  = av_default_item_name,
  646.     .option     = demux_options,
  647.     .version    = LIBAVUTIL_VERSION_INT,
  648. };
  649. AVInputFormat ff_wav_demuxer = {
  650.     .name           = "wav",
  651.     .long_name      = NULL_IF_CONFIG_SMALL("WAV / WAVE (Waveform Audio)"),
  652.     .priv_data_size = sizeof(WAVDemuxContext),
  653.     .read_probe     = wav_probe,
  654.     .read_header    = wav_read_header,
  655.     .read_packet    = wav_read_packet,
  656.     .read_seek      = wav_read_seek,
  657.     .flags          = AVFMT_GENERIC_INDEX,
  658.     .codec_tag      = (const AVCodecTag * const []) { ff_codec_wav_tags,  0 },
  659.     .priv_class     = &wav_demuxer_class,
  660. };
  661. #endif /* CONFIG_WAV_DEMUXER */
  662.  
  663. #if CONFIG_W64_DEMUXER
  664. static int w64_probe(AVProbeData *p)
  665. {
  666.     if (p->buf_size <= 40)
  667.         return 0;
  668.     if (!memcmp(p->buf,      ff_w64_guid_riff, 16) &&
  669.         !memcmp(p->buf + 24, ff_w64_guid_wave, 16))
  670.         return AVPROBE_SCORE_MAX;
  671.     else
  672.         return 0;
  673. }
  674.  
  675. static int w64_read_header(AVFormatContext *s)
  676. {
  677.     int64_t size, data_ofs = 0;
  678.     AVIOContext *pb      = s->pb;
  679.     WAVDemuxContext *wav = s->priv_data;
  680.     AVStream *st;
  681.     uint8_t guid[16];
  682.     int ret;
  683.  
  684.     avio_read(pb, guid, 16);
  685.     if (memcmp(guid, ff_w64_guid_riff, 16))
  686.         return AVERROR_INVALIDDATA;
  687.  
  688.     /* riff + wave + fmt + sizes */
  689.     if (avio_rl64(pb) < 16 + 8 + 16 + 8 + 16 + 8)
  690.         return AVERROR_INVALIDDATA;
  691.  
  692.     avio_read(pb, guid, 16);
  693.     if (memcmp(guid, ff_w64_guid_wave, 16)) {
  694.         av_log(s, AV_LOG_ERROR, "could not find wave guid\n");
  695.         return AVERROR_INVALIDDATA;
  696.     }
  697.  
  698.     wav->w64 = 1;
  699.  
  700.     st = avformat_new_stream(s, NULL);
  701.     if (!st)
  702.         return AVERROR(ENOMEM);
  703.  
  704.     while (!avio_feof(pb)) {
  705.         if (avio_read(pb, guid, 16) != 16)
  706.             break;
  707.         size = avio_rl64(pb);
  708.         if (size <= 24 || INT64_MAX - size < avio_tell(pb))
  709.             return AVERROR_INVALIDDATA;
  710.  
  711.         if (!memcmp(guid, ff_w64_guid_fmt, 16)) {
  712.             /* subtract chunk header size - normal wav file doesn't count it */
  713.             ret = ff_get_wav_header(s, pb, st->codec, size - 24, 0);
  714.             if (ret < 0)
  715.                 return ret;
  716.             avio_skip(pb, FFALIGN(size, INT64_C(8)) - size);
  717.  
  718.             avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
  719.         } else if (!memcmp(guid, ff_w64_guid_fact, 16)) {
  720.             int64_t samples;
  721.  
  722.             samples = avio_rl64(pb);
  723.             if (samples > 0)
  724.                 st->duration = samples;
  725.         } else if (!memcmp(guid, ff_w64_guid_data, 16)) {
  726.             wav->data_end = avio_tell(pb) + size - 24;
  727.  
  728.             data_ofs = avio_tell(pb);
  729.             if (!pb->seekable)
  730.                 break;
  731.  
  732.             avio_skip(pb, size - 24);
  733.         } else if (!memcmp(guid, ff_w64_guid_summarylist, 16)) {
  734.             int64_t start, end, cur;
  735.             uint32_t count, chunk_size, i;
  736.  
  737.             start = avio_tell(pb);
  738.             end = start + FFALIGN(size, INT64_C(8)) - 24;
  739.             count = avio_rl32(pb);
  740.  
  741.             for (i = 0; i < count; i++) {
  742.                 char chunk_key[5], *value;
  743.  
  744.                 if (avio_feof(pb) || (cur = avio_tell(pb)) < 0 || cur > end - 8 /* = tag + size */)
  745.                     break;
  746.  
  747.                 chunk_key[4] = 0;
  748.                 avio_read(pb, chunk_key, 4);
  749.                 chunk_size = avio_rl32(pb);
  750.  
  751.                 value = av_mallocz(chunk_size + 1);
  752.                 if (!value)
  753.                     return AVERROR(ENOMEM);
  754.  
  755.                 ret = avio_get_str16le(pb, chunk_size, value, chunk_size);
  756.                 avio_skip(pb, chunk_size - ret);
  757.  
  758.                 av_dict_set(&s->metadata, chunk_key, value, AV_DICT_DONT_STRDUP_VAL);
  759.             }
  760.  
  761.             avio_skip(pb, end - avio_tell(pb));
  762.         } else {
  763.             av_log(s, AV_LOG_DEBUG, "unknown guid: "FF_PRI_GUID"\n", FF_ARG_GUID(guid));
  764.             avio_skip(pb, FFALIGN(size, INT64_C(8)) - 24);
  765.         }
  766.     }
  767.  
  768.     if (!data_ofs)
  769.         return AVERROR_EOF;
  770.  
  771.     ff_metadata_conv_ctx(s, NULL, wav_metadata_conv);
  772.     ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
  773.  
  774.     handle_stream_probing(st);
  775.     st->need_parsing = AVSTREAM_PARSE_FULL_RAW;
  776.  
  777.     avio_seek(pb, data_ofs, SEEK_SET);
  778.  
  779.     return 0;
  780. }
  781.  
  782. AVInputFormat ff_w64_demuxer = {
  783.     .name           = "w64",
  784.     .long_name      = NULL_IF_CONFIG_SMALL("Sony Wave64"),
  785.     .priv_data_size = sizeof(WAVDemuxContext),
  786.     .read_probe     = w64_probe,
  787.     .read_header    = w64_read_header,
  788.     .read_packet    = wav_read_packet,
  789.     .read_seek      = wav_read_seek,
  790.     .flags          = AVFMT_GENERIC_INDEX,
  791.     .codec_tag      = (const AVCodecTag * const []) { ff_codec_wav_tags, 0 },
  792. };
  793. #endif /* CONFIG_W64_DEMUXER */
  794.