Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | RSS feed

  1. /*
  2.  * Copyright (C) 2005  Michael Ahlberg, Måns Rullgård
  3.  *
  4.  * Permission is hereby granted, free of charge, to any person
  5.  * obtaining a copy of this software and associated documentation
  6.  * files (the "Software"), to deal in the Software without
  7.  * restriction, including without limitation the rights to use, copy,
  8.  * modify, merge, publish, distribute, sublicense, and/or sell copies
  9.  * of the Software, and to permit persons to whom the Software is
  10.  * furnished to do so, subject to the following conditions:
  11.  *
  12.  *  The above copyright notice and this permission notice shall be
  13.  *  included in all copies or substantial portions of the Software.
  14.  *
  15.  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16.  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17.  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18.  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  19.  *  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20.  *  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21.  *  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22.  *  DEALINGS IN THE SOFTWARE.
  23.  */
  24.  
  25. #include <stdlib.h>
  26.  
  27. #include "libavutil/avstring.h"
  28. #include "libavutil/base64.h"
  29. #include "libavutil/bswap.h"
  30. #include "libavutil/dict.h"
  31. #include "libavcodec/bytestream.h"
  32. #include "libavcodec/get_bits.h"
  33. #include "libavcodec/vorbis_parser.h"
  34. #include "avformat.h"
  35. #include "flac_picture.h"
  36. #include "internal.h"
  37. #include "oggdec.h"
  38. #include "vorbiscomment.h"
  39.  
  40. static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val)
  41. {
  42.     int i, cnum, h, m, s, ms, keylen = strlen(key);
  43.     AVChapter *chapter = NULL;
  44.  
  45.     if (keylen < 9 || sscanf(key, "CHAPTER%03d", &cnum) != 1)
  46.         return 0;
  47.  
  48.     if (keylen <= 10) {
  49.         if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
  50.             return 0;
  51.  
  52.         avpriv_new_chapter(as, cnum, (AVRational) { 1, 1000 },
  53.                            ms + 1000 * (s + 60 * (m + 60 * h)),
  54.                            AV_NOPTS_VALUE, NULL);
  55.         av_free(val);
  56.     } else if (!strcmp(key + keylen - 4, "NAME")) {
  57.         for (i = 0; i < as->nb_chapters; i++)
  58.             if (as->chapters[i]->id == cnum) {
  59.                 chapter = as->chapters[i];
  60.                 break;
  61.             }
  62.         if (!chapter)
  63.             return 0;
  64.  
  65.         av_dict_set(&chapter->metadata, "title", val, AV_DICT_DONT_STRDUP_VAL);
  66.     } else
  67.         return 0;
  68.  
  69.     av_free(key);
  70.     return 1;
  71. }
  72.  
  73. int ff_vorbis_comment(AVFormatContext *as, AVDictionary **m,
  74.                       const uint8_t *buf, int size)
  75. {
  76.     const uint8_t *p   = buf;
  77.     const uint8_t *end = buf + size;
  78.     unsigned n, j;
  79.     int s;
  80.  
  81.     /* must have vendor_length and user_comment_list_length */
  82.     if (size < 8)
  83.         return AVERROR_INVALIDDATA;
  84.  
  85.     s = bytestream_get_le32(&p);
  86.  
  87.     if (end - p - 4 < s || s < 0)
  88.         return AVERROR_INVALIDDATA;
  89.  
  90.     p += s;
  91.  
  92.     n = bytestream_get_le32(&p);
  93.  
  94.     while (end - p >= 4 && n > 0) {
  95.         const char *t, *v;
  96.         int tl, vl;
  97.  
  98.         s = bytestream_get_le32(&p);
  99.  
  100.         if (end - p < s || s < 0)
  101.             break;
  102.  
  103.         t  = p;
  104.         p += s;
  105.         n--;
  106.  
  107.         v = memchr(t, '=', s);
  108.         if (!v)
  109.             continue;
  110.  
  111.         tl = v - t;
  112.         vl = s - tl - 1;
  113.         v++;
  114.  
  115.         if (tl && vl) {
  116.             char *tt, *ct;
  117.  
  118.             tt = av_malloc(tl + 1);
  119.             ct = av_malloc(vl + 1);
  120.             if (!tt || !ct) {
  121.                 av_freep(&tt);
  122.                 av_freep(&ct);
  123.                 return AVERROR(ENOMEM);
  124.             }
  125.  
  126.             for (j = 0; j < tl; j++)
  127.                 tt[j] = av_toupper(t[j]);
  128.             tt[tl] = 0;
  129.  
  130.             memcpy(ct, v, vl);
  131.             ct[vl] = 0;
  132.  
  133.             /* The format in which the pictures are stored is the FLAC format.
  134.              * Xiph says: "The binary FLAC picture structure is base64 encoded
  135.              * and placed within a VorbisComment with the tag name
  136.              * 'METADATA_BLOCK_PICTURE'. This is the preferred and
  137.              * recommended way of embedding cover art within VorbisComments."
  138.              */
  139.             if (!strcmp(tt, "METADATA_BLOCK_PICTURE")) {
  140.                 int ret;
  141.                 char *pict = av_malloc(vl);
  142.  
  143.                 if (!pict) {
  144.                     av_log(as, AV_LOG_WARNING, "out-of-memory error. Skipping cover art block.\n");
  145.                     av_freep(&tt);
  146.                     av_freep(&ct);
  147.                     continue;
  148.                 }
  149.                 if ((ret = av_base64_decode(pict, ct, vl)) > 0)
  150.                     ret = ff_flac_parse_picture(as, pict, ret);
  151.                 av_freep(&tt);
  152.                 av_freep(&ct);
  153.                 av_freep(&pict);
  154.                 if (ret < 0) {
  155.                     av_log(as, AV_LOG_WARNING, "Failed to parse cover art block.\n");
  156.                     continue;
  157.                 }
  158.             } else if (!ogm_chapter(as, tt, ct))
  159.                 av_dict_set(m, tt, ct,
  160.                             AV_DICT_DONT_STRDUP_KEY |
  161.                             AV_DICT_DONT_STRDUP_VAL);
  162.         }
  163.     }
  164.  
  165.     if (p != end)
  166.         av_log(as, AV_LOG_INFO,
  167.                "%ti bytes of comment header remain\n", end - p);
  168.     if (n > 0)
  169.         av_log(as, AV_LOG_INFO,
  170.                "truncated comment header, %i comments not found\n", n);
  171.  
  172.     ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);
  173.  
  174.     return 0;
  175. }
  176.  
  177. /*
  178.  * Parse the vorbis header
  179.  *
  180.  * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
  181.  * [vorbis_version] = read 32 bits as unsigned integer | Not used
  182.  * [audio_channels] = read 8 bit integer as unsigned | Used
  183.  * [audio_sample_rate] = read 32 bits as unsigned integer | Used
  184.  * [bitrate_maximum] = read 32 bits as signed integer | Not used yet
  185.  * [bitrate_nominal] = read 32 bits as signed integer | Not used yet
  186.  * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
  187.  * [blocksize_0] = read 4 bits as unsigned integer | Not Used
  188.  * [blocksize_1] = read 4 bits as unsigned integer | Not Used
  189.  * [framing_flag] = read one bit | Not Used
  190.  */
  191.  
  192. struct oggvorbis_private {
  193.     unsigned int len[3];
  194.     unsigned char *packet[3];
  195.     VorbisParseContext vp;
  196.     int64_t final_pts;
  197.     int final_duration;
  198. };
  199.  
  200. static int fixup_vorbis_headers(AVFormatContext *as,
  201.                                 struct oggvorbis_private *priv,
  202.                                 uint8_t **buf)
  203. {
  204.     int i, offset, len, err;
  205.     int buf_len;
  206.     unsigned char *ptr;
  207.  
  208.     len = priv->len[0] + priv->len[1] + priv->len[2];
  209.     buf_len = len + len / 255 + 64;
  210.     ptr = *buf = av_realloc(NULL, buf_len);
  211.     if (!ptr)
  212.         return AVERROR(ENOMEM);
  213.     memset(*buf, '\0', buf_len);
  214.  
  215.     ptr[0]  = 2;
  216.     offset  = 1;
  217.     offset += av_xiphlacing(&ptr[offset], priv->len[0]);
  218.     offset += av_xiphlacing(&ptr[offset], priv->len[1]);
  219.     for (i = 0; i < 3; i++) {
  220.         memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
  221.         offset += priv->len[i];
  222.         av_freep(&priv->packet[i]);
  223.     }
  224.     if ((err = av_reallocp(buf, offset + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
  225.         return err;
  226.     return offset;
  227. }
  228.  
  229. static void vorbis_cleanup(AVFormatContext *s, int idx)
  230. {
  231.     struct ogg *ogg = s->priv_data;
  232.     struct ogg_stream *os = ogg->streams + idx;
  233.     struct oggvorbis_private *priv = os->private;
  234.     int i;
  235.     if (os->private)
  236.         for (i = 0; i < 3; i++)
  237.             av_freep(&priv->packet[i]);
  238. }
  239.  
  240. static int vorbis_header(AVFormatContext *s, int idx)
  241. {
  242.     struct ogg *ogg = s->priv_data;
  243.     AVStream *st    = s->streams[idx];
  244.     struct ogg_stream *os = ogg->streams + idx;
  245.     struct oggvorbis_private *priv;
  246.     int pkt_type = os->buf[os->pstart];
  247.  
  248.     if (!os->private) {
  249.         os->private = av_mallocz(sizeof(struct oggvorbis_private));
  250.         if (!os->private)
  251.             return AVERROR(ENOMEM);
  252.     }
  253.  
  254.     if (!(pkt_type & 1))
  255.         return 0;
  256.  
  257.     if (os->psize < 1 || pkt_type > 5)
  258.         return AVERROR_INVALIDDATA;
  259.  
  260.     priv = os->private;
  261.  
  262.     if (priv->packet[pkt_type >> 1])
  263.         return AVERROR_INVALIDDATA;
  264.     if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
  265.         return AVERROR_INVALIDDATA;
  266.  
  267.     priv->len[pkt_type >> 1]    = os->psize;
  268.     priv->packet[pkt_type >> 1] = av_mallocz(os->psize);
  269.     if (!priv->packet[pkt_type >> 1])
  270.         return AVERROR(ENOMEM);
  271.     memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
  272.     if (os->buf[os->pstart] == 1) {
  273.         const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
  274.         unsigned blocksize, bs0, bs1;
  275.         int srate;
  276.         int channels;
  277.  
  278.         if (os->psize != 30)
  279.             return AVERROR_INVALIDDATA;
  280.  
  281.         if (bytestream_get_le32(&p) != 0) /* vorbis_version */
  282.             return AVERROR_INVALIDDATA;
  283.  
  284.         channels = bytestream_get_byte(&p);
  285.         if (st->codec->channels && channels != st->codec->channels) {
  286.             av_log(s, AV_LOG_ERROR, "Channel change is not supported\n");
  287.             return AVERROR_PATCHWELCOME;
  288.         }
  289.         st->codec->channels = channels;
  290.         srate               = bytestream_get_le32(&p);
  291.         p += 4; // skip maximum bitrate
  292.         st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
  293.         p += 4; // skip minimum bitrate
  294.  
  295.         blocksize = bytestream_get_byte(&p);
  296.         bs0       = blocksize & 15;
  297.         bs1       = blocksize >> 4;
  298.  
  299.         if (bs0 > bs1)
  300.             return AVERROR_INVALIDDATA;
  301.         if (bs0 < 6 || bs1 > 13)
  302.             return AVERROR_INVALIDDATA;
  303.  
  304.         if (bytestream_get_byte(&p) != 1) /* framing_flag */
  305.             return AVERROR_INVALIDDATA;
  306.  
  307.         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
  308.         st->codec->codec_id   = AV_CODEC_ID_VORBIS;
  309.  
  310.         if (srate > 0) {
  311.             st->codec->sample_rate = srate;
  312.             avpriv_set_pts_info(st, 64, 1, srate);
  313.         }
  314.     } else if (os->buf[os->pstart] == 3) {
  315.         if (os->psize > 8 &&
  316.             ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7,
  317.                               os->psize - 8) >= 0) {
  318.             // drop all metadata we parsed and which is not required by libvorbis
  319.             unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
  320.             if (new_len >= 16 && new_len < os->psize) {
  321.                 AV_WL32(priv->packet[1] + new_len - 5, 0);
  322.                 priv->packet[1][new_len - 1] = 1;
  323.                 priv->len[1]                 = new_len;
  324.             }
  325.         }
  326.     } else {
  327.         int ret = fixup_vorbis_headers(s, priv, &st->codec->extradata);
  328.         if (ret < 0) {
  329.             st->codec->extradata_size = 0;
  330.             return ret;
  331.         }
  332.         st->codec->extradata_size = ret;
  333.         if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
  334.             av_freep(&st->codec->extradata);
  335.             st->codec->extradata_size = 0;
  336.             return ret;
  337.         }
  338.     }
  339.  
  340.     return 1;
  341. }
  342.  
  343. static int vorbis_packet(AVFormatContext *s, int idx)
  344. {
  345.     struct ogg *ogg = s->priv_data;
  346.     struct ogg_stream *os = ogg->streams + idx;
  347.     struct oggvorbis_private *priv = os->private;
  348.     int duration;
  349.  
  350.     /* first packet handling
  351.      * here we parse the duration of each packet in the first page and compare
  352.      * the total duration to the page granule to find the encoder delay and
  353.      * set the first timestamp */
  354.     if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) {
  355.         int seg, d;
  356.         uint8_t *last_pkt  = os->buf + os->pstart;
  357.         uint8_t *next_pkt  = last_pkt;
  358.  
  359.         avpriv_vorbis_parse_reset(&priv->vp);
  360.         duration = 0;
  361.         seg = os->segp;
  362.         d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
  363.         if (d < 0) {
  364.             os->pflags |= AV_PKT_FLAG_CORRUPT;
  365.             return 0;
  366.         }
  367.         duration += d;
  368.         last_pkt = next_pkt =  next_pkt + os->psize;
  369.         for (; seg < os->nsegs; seg++) {
  370.             if (os->segments[seg] < 255) {
  371.                 int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
  372.                 if (d < 0) {
  373.                     duration = os->granule;
  374.                     break;
  375.                 }
  376.                 duration += d;
  377.                 last_pkt  = next_pkt + os->segments[seg];
  378.             }
  379.             next_pkt += os->segments[seg];
  380.         }
  381.         os->lastpts                 =
  382.         os->lastdts                 = os->granule - duration;
  383.         if (s->streams[idx]->start_time == AV_NOPTS_VALUE) {
  384.             s->streams[idx]->start_time = FFMAX(os->lastpts, 0);
  385.             if (s->streams[idx]->duration)
  386.                 s->streams[idx]->duration -= s->streams[idx]->start_time;
  387.         }
  388.         priv->final_pts          = AV_NOPTS_VALUE;
  389.         avpriv_vorbis_parse_reset(&priv->vp);
  390.     }
  391.  
  392.     /* parse packet duration */
  393.     if (os->psize > 0) {
  394.         duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
  395.         if (duration < 0) {
  396.             os->pflags |= AV_PKT_FLAG_CORRUPT;
  397.             return 0;
  398.         }
  399.         os->pduration = duration;
  400.     }
  401.  
  402.     /* final packet handling
  403.      * here we save the pts of the first packet in the final page, sum up all
  404.      * packet durations in the final page except for the last one, and compare
  405.      * to the page granule to find the duration of the final packet */
  406.     if (os->flags & OGG_FLAG_EOS) {
  407.         if (os->lastpts != AV_NOPTS_VALUE) {
  408.             priv->final_pts      = os->lastpts;
  409.             priv->final_duration = 0;
  410.         }
  411.         if (os->segp == os->nsegs)
  412.             os->pduration = os->granule - priv->final_pts - priv->final_duration;
  413.         priv->final_duration += os->pduration;
  414.     }
  415.  
  416.     return 0;
  417. }
  418.  
  419. const struct ogg_codec ff_vorbis_codec = {
  420.     .magic     = "\001vorbis",
  421.     .magicsize = 7,
  422.     .header    = vorbis_header,
  423.     .packet    = vorbis_packet,
  424.     .cleanup   = vorbis_cleanup,
  425.     .nb_header = 3,
  426. };
  427.