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