LCOV - code coverage report
Current view: top level - libavformat - wsddec.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 3 94 3.2 %
Date: 2017-12-18 13:19:42 Functions: 1 5 20.0 %

          Line data    Source code
       1             : /*
       2             :  * Wideband Single-bit Data (WSD) demuxer
       3             :  * Copyright (c) 2014 Peter Ross
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include "libavutil/intreadwrite.h"
      23             : #include "libavutil/timecode.h"
      24             : #include "avformat.h"
      25             : #include "internal.h"
      26             : #include "rawdec.h"
      27             : 
      28        6130 : static int wsd_probe(AVProbeData *p)
      29             : {
      30        6130 :     if (p->buf_size < 45 || memcmp(p->buf, "1bit", 4) ||
      31           0 :         !AV_RB32(p->buf + 36) || !p->buf[44] ||
      32           0 :         (p->buf[0] >= 0x10 && (AV_RB32(p->buf + 20) < 0x80 || AV_RB32(p->buf + 24) < 0x80)))
      33        6130 :        return 0;
      34           0 :     return AVPROBE_SCORE_MAX;
      35             : }
      36             : 
      37           0 : static int empty_string(const char *buf, unsigned size)
      38             : {
      39           0 :     while (size--) {
      40           0 :        if (*buf++ != ' ')
      41           0 :            return 0;
      42             :     }
      43           0 :     return 1;
      44             : }
      45             : 
      46           0 : static int wsd_to_av_channel_layoyt(AVFormatContext *s, int bit)
      47             : {
      48           0 :     switch (bit) {
      49           0 :     case 2: return AV_CH_BACK_RIGHT;
      50           0 :     case 3:
      51           0 :         avpriv_request_sample(s, "Rr-middle");
      52           0 :         break;
      53           0 :     case 4: return AV_CH_BACK_CENTER;
      54           0 :     case 5:
      55           0 :         avpriv_request_sample(s, "Lr-middle");
      56           0 :         break;
      57           0 :     case 6: return AV_CH_BACK_LEFT;
      58           0 :     case 24: return AV_CH_LOW_FREQUENCY;
      59           0 :     case 26: return AV_CH_FRONT_RIGHT;
      60           0 :     case 27: return AV_CH_FRONT_RIGHT_OF_CENTER;
      61           0 :     case 28: return AV_CH_FRONT_CENTER;
      62           0 :     case 29: return AV_CH_FRONT_LEFT_OF_CENTER;
      63           0 :     case 30: return AV_CH_FRONT_LEFT;
      64           0 :     default:
      65           0 :         av_log(s, AV_LOG_WARNING, "reserved channel assignment\n");
      66           0 :         break;
      67             :     }
      68           0 :     return 0;
      69             : }
      70             : 
      71           0 : static int get_metadata(AVFormatContext *s, const char *const tag, const unsigned size)
      72             : {
      73             :     uint8_t *buf;
      74           0 :     if (!(size + 1))
      75           0 :         return AVERROR(ENOMEM);
      76             : 
      77           0 :     buf = av_malloc(size + 1);
      78           0 :     if (!buf)
      79           0 :         return AVERROR(ENOMEM);
      80             : 
      81           0 :     if (avio_read(s->pb, buf, size) != size) {
      82           0 :         av_free(buf);
      83           0 :         return AVERROR(EIO);
      84             :     }
      85             : 
      86           0 :     if (empty_string(buf, size)) {
      87           0 :         av_free(buf);
      88           0 :         return 0;
      89             :     }
      90             : 
      91           0 :     buf[size] = 0;
      92           0 :     av_dict_set(&s->metadata, tag, buf, AV_DICT_DONT_STRDUP_VAL);
      93           0 :     return 0;
      94             : }
      95             : 
      96           0 : static int wsd_read_header(AVFormatContext *s)
      97             : {
      98           0 :     AVIOContext *pb = s->pb;
      99             :     AVStream *st;
     100             :     int version;
     101             :     uint32_t text_offset, data_offset, channel_assign;
     102             :     char playback_time[AV_TIMECODE_STR_SIZE];
     103             : 
     104           0 :     st = avformat_new_stream(s, NULL);
     105           0 :     if (!st)
     106           0 :         return AVERROR(ENOMEM);
     107             : 
     108           0 :     avio_skip(pb, 8);
     109           0 :     version = avio_r8(pb);
     110           0 :     av_log(s, AV_LOG_DEBUG, "version: %i.%i\n", version >> 4, version & 0xF);
     111           0 :     avio_skip(pb, 11);
     112             : 
     113           0 :     if (version < 0x10) {
     114           0 :         text_offset = 0x80;
     115           0 :         data_offset = 0x800;
     116           0 :         avio_skip(pb, 8);
     117             :     } else {
     118           0 :         text_offset = avio_rb32(pb);
     119           0 :         data_offset = avio_rb32(pb);
     120             :     }
     121             : 
     122           0 :     avio_skip(pb, 4);
     123           0 :     av_timecode_make_smpte_tc_string(playback_time, avio_rb32(pb), 0);
     124           0 :     av_dict_set(&s->metadata, "playback_time", playback_time, 0);
     125             : 
     126           0 :     st->codecpar->codec_type  = AVMEDIA_TYPE_AUDIO;
     127           0 :     st->codecpar->codec_id    = s->iformat->raw_codec_id;
     128           0 :     st->codecpar->sample_rate = avio_rb32(pb) / 8;
     129           0 :     avio_skip(pb, 4);
     130           0 :     st->codecpar->channels    = avio_r8(pb) & 0xF;
     131           0 :     st->codecpar->bit_rate    = (int64_t)st->codecpar->channels * st->codecpar->sample_rate * 8LL;
     132           0 :     if (!st->codecpar->channels)
     133           0 :         return AVERROR_INVALIDDATA;
     134             : 
     135           0 :     avio_skip(pb, 3);
     136           0 :     channel_assign         = avio_rb32(pb);
     137           0 :     if (!(channel_assign & 1)) {
     138             :         int i;
     139           0 :         for (i = 1; i < 32; i++)
     140           0 :             if (channel_assign & (1 << i))
     141           0 :                 st->codecpar->channel_layout |= wsd_to_av_channel_layoyt(s, i);
     142             :     }
     143             : 
     144           0 :     avio_skip(pb, 16);
     145           0 :     if (avio_rb32(pb))
     146           0 :        avpriv_request_sample(s, "emphasis");
     147             : 
     148           0 :     if (avio_seek(pb, text_offset, SEEK_SET) >= 0) {
     149           0 :         get_metadata(s, "title",       128);
     150           0 :         get_metadata(s, "composer",    128);
     151           0 :         get_metadata(s, "song_writer", 128);
     152           0 :         get_metadata(s, "artist",      128);
     153           0 :         get_metadata(s, "album",       128);
     154           0 :         get_metadata(s, "genre",        32);
     155           0 :         get_metadata(s, "date",         32);
     156           0 :         get_metadata(s, "location",     32);
     157           0 :         get_metadata(s, "comment",     512);
     158           0 :         get_metadata(s, "user",        512);
     159             :     }
     160             : 
     161           0 :     return avio_seek(pb, data_offset, SEEK_SET);
     162             : }
     163             : 
     164             : AVInputFormat ff_wsd_demuxer = {
     165             :     .name         = "wsd",
     166             :     .long_name    = NULL_IF_CONFIG_SMALL("Wideband Single-bit Data (WSD)"),
     167             :     .read_probe   = wsd_probe,
     168             :     .read_header  = wsd_read_header,
     169             :     .read_packet  = ff_raw_read_partial_packet,
     170             :     .extensions   = "wsd",
     171             :     .flags        = AVFMT_GENERIC_INDEX | AVFMT_NO_BYTE_SEEK,
     172             :     .raw_codec_id = AV_CODEC_ID_DSD_MSBF,
     173             : };

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