| /** |
| Copyright (C) 2005 Michael Ahlberg, Måns Rullgård |
| |
| Permission is hereby granted, free of charge, to any person |
| obtaining a copy of this software and associated documentation |
| files (the "Software"), to deal in the Software without |
| restriction, including without limitation the rights to use, copy, |
| modify, merge, publish, distribute, sublicense, and/or sell copies |
| of the Software, and to permit persons to whom the Software is |
| furnished to do so, subject to the following conditions: |
| |
| The above copyright notice and this permission notice shall be |
| included in all copies or substantial portions of the Software. |
| |
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
| EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
| MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
| NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT |
| HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, |
| WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
| DEALINGS IN THE SOFTWARE. |
| **/ |
| |
| #include <stdlib.h> |
| #include "libavutil/avstring.h" |
| #include "libavutil/base64.h" |
| #include "libavutil/bswap.h" |
| #include "libavutil/dict.h" |
| #include "libavcodec/get_bits.h" |
| #include "libavcodec/bytestream.h" |
| #include "libavcodec/vorbis_parser.h" |
| #include "avformat.h" |
| #include "flacdec.h" |
| #include "internal.h" |
| #include "oggdec.h" |
| #include "vorbiscomment.h" |
| |
| static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val) |
| { |
| int i, cnum, h, m, s, ms, keylen = strlen(key); |
| AVChapter *chapter = NULL; |
| |
| if (keylen < 9 || sscanf(key, "CHAPTER%02d", &cnum) != 1) |
| return 0; |
| |
| if (keylen == 9) { |
| if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4) |
| return 0; |
| |
| avpriv_new_chapter(as, cnum, (AVRational){1,1000}, |
| ms + 1000*(s + 60*(m + 60*h)), |
| AV_NOPTS_VALUE, NULL); |
| av_free(val); |
| } else if (!strcmp(key+9, "NAME")) { |
| for(i = 0; i < as->nb_chapters; i++) |
| if (as->chapters[i]->id == cnum) { |
| chapter = as->chapters[i]; |
| break; |
| } |
| if (!chapter) |
| return 0; |
| |
| av_dict_set(&chapter->metadata, "title", val, |
| AV_DICT_DONT_STRDUP_VAL); |
| } else |
| return 0; |
| |
| av_free(key); |
| return 1; |
| } |
| |
| int |
| ff_vorbis_comment(AVFormatContext * as, AVDictionary **m, const uint8_t *buf, int size) |
| { |
| const uint8_t *p = buf; |
| const uint8_t *end = buf + size; |
| unsigned n, j; |
| int s; |
| |
| if (size < 8) /* must have vendor_length and user_comment_list_length */ |
| return -1; |
| |
| s = bytestream_get_le32(&p); |
| |
| if (end - p - 4 < s || s < 0) |
| return -1; |
| |
| p += s; |
| |
| n = bytestream_get_le32(&p); |
| |
| while (end - p >= 4 && n > 0) { |
| const char *t, *v; |
| int tl, vl; |
| |
| s = bytestream_get_le32(&p); |
| |
| if (end - p < s || s < 0) |
| break; |
| |
| t = p; |
| p += s; |
| n--; |
| |
| v = memchr(t, '=', s); |
| if (!v) |
| continue; |
| |
| tl = v - t; |
| vl = s - tl - 1; |
| v++; |
| |
| if (tl && vl) { |
| char *tt, *ct; |
| |
| tt = av_malloc(tl + 1); |
| ct = av_malloc(vl + 1); |
| if (!tt || !ct) { |
| av_freep(&tt); |
| av_freep(&ct); |
| av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n"); |
| continue; |
| } |
| |
| for (j = 0; j < tl; j++) |
| tt[j] = av_toupper(t[j]); |
| tt[tl] = 0; |
| |
| memcpy(ct, v, vl); |
| ct[vl] = 0; |
| |
| if (!strcmp(tt, "METADATA_BLOCK_PICTURE")) { |
| int ret; |
| char *pict = av_malloc(vl); |
| |
| if (!pict) { |
| av_log(as, AV_LOG_WARNING, "out-of-memory error. Skipping cover art block.\n"); |
| av_freep(&tt); |
| av_freep(&ct); |
| continue; |
| } |
| if ((ret = av_base64_decode(pict, ct, vl)) > 0) |
| ret = ff_flac_parse_picture(as, pict, ret); |
| av_freep(&pict); |
| av_freep(&tt); |
| av_freep(&ct); |
| if (ret < 0) { |
| av_log(as, AV_LOG_WARNING, "Failed to parse cover art block.\n"); |
| continue; |
| } |
| } else if (!ogm_chapter(as, tt, ct)) |
| av_dict_set(m, tt, ct, |
| AV_DICT_DONT_STRDUP_KEY | |
| AV_DICT_DONT_STRDUP_VAL); |
| } |
| } |
| |
| if (p != end) |
| av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", end-p); |
| if (n > 0) |
| av_log(as, AV_LOG_INFO, |
| "truncated comment header, %i comments not found\n", n); |
| |
| ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv); |
| |
| return 0; |
| } |
| |
| |
| /** Parse the vorbis header |
| * Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec |
| * [vorbis_version] = read 32 bits as unsigned integer | Not used |
| * [audio_channels] = read 8 bit integer as unsigned | Used |
| * [audio_sample_rate] = read 32 bits as unsigned integer | Used |
| * [bitrate_maximum] = read 32 bits as signed integer | Not used yet |
| * [bitrate_nominal] = read 32 bits as signed integer | Not used yet |
| * [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate |
| * [blocksize_0] = read 4 bits as unsigned integer | Not Used |
| * [blocksize_1] = read 4 bits as unsigned integer | Not Used |
| * [framing_flag] = read one bit | Not Used |
| * */ |
| |
| struct oggvorbis_private { |
| unsigned int len[3]; |
| unsigned char *packet[3]; |
| VorbisParseContext vp; |
| int64_t final_pts; |
| int final_duration; |
| }; |
| |
| |
| static unsigned int |
| fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv, |
| uint8_t **buf) |
| { |
| int i,offset, len, buf_len; |
| unsigned char *ptr; |
| |
| len = priv->len[0] + priv->len[1] + priv->len[2]; |
| buf_len = len + len/255 + 64; |
| ptr = *buf = av_realloc(NULL, buf_len); |
| if (!*buf) |
| return 0; |
| memset(*buf, '\0', buf_len); |
| |
| ptr[0] = 2; |
| offset = 1; |
| offset += av_xiphlacing(&ptr[offset], priv->len[0]); |
| offset += av_xiphlacing(&ptr[offset], priv->len[1]); |
| for (i = 0; i < 3; i++) { |
| memcpy(&ptr[offset], priv->packet[i], priv->len[i]); |
| offset += priv->len[i]; |
| av_freep(&priv->packet[i]); |
| } |
| *buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE); |
| return offset; |
| } |
| |
| static void vorbis_cleanup(AVFormatContext *s, int idx) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os = ogg->streams + idx; |
| struct oggvorbis_private *priv = os->private; |
| int i; |
| if (os->private) |
| for (i = 0; i < 3; i++) |
| av_freep(&priv->packet[i]); |
| } |
| |
| static int |
| vorbis_header (AVFormatContext * s, int idx) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os = ogg->streams + idx; |
| AVStream *st = s->streams[idx]; |
| struct oggvorbis_private *priv; |
| int pkt_type = os->buf[os->pstart]; |
| |
| if (!(pkt_type & 1)) |
| return os->private ? 0 : -1; |
| |
| if (!os->private) { |
| os->private = av_mallocz(sizeof(struct oggvorbis_private)); |
| if (!os->private) |
| return -1; |
| } |
| |
| if (os->psize < 1 || pkt_type > 5) |
| return -1; |
| |
| priv = os->private; |
| |
| if (priv->packet[pkt_type>>1]) |
| return -1; |
| if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1]) |
| return -1; |
| |
| priv->len[pkt_type >> 1] = os->psize; |
| priv->packet[pkt_type >> 1] = av_mallocz(os->psize); |
| if (!priv->packet[pkt_type >> 1]) |
| return AVERROR(ENOMEM); |
| memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize); |
| if (os->buf[os->pstart] == 1) { |
| const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */ |
| unsigned blocksize, bs0, bs1; |
| int srate; |
| int channels; |
| |
| if (os->psize != 30) |
| return -1; |
| |
| if (bytestream_get_le32(&p) != 0) /* vorbis_version */ |
| return -1; |
| |
| channels= bytestream_get_byte(&p); |
| if (st->codec->channels && channels != st->codec->channels) { |
| av_log(s, AV_LOG_ERROR, "Channel change is not supported\n"); |
| return AVERROR_PATCHWELCOME; |
| } |
| st->codec->channels = channels; |
| srate = bytestream_get_le32(&p); |
| p += 4; // skip maximum bitrate |
| st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate |
| p += 4; // skip minimum bitrate |
| |
| blocksize = bytestream_get_byte(&p); |
| bs0 = blocksize & 15; |
| bs1 = blocksize >> 4; |
| |
| if (bs0 > bs1) |
| return -1; |
| if (bs0 < 6 || bs1 > 13) |
| return -1; |
| |
| if (bytestream_get_byte(&p) != 1) /* framing_flag */ |
| return -1; |
| |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = AV_CODEC_ID_VORBIS; |
| |
| if (srate > 0) { |
| st->codec->sample_rate = srate; |
| avpriv_set_pts_info(st, 64, 1, srate); |
| } |
| } else if (os->buf[os->pstart] == 3) { |
| if (os->psize > 8 && |
| ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8) >= 0) { |
| // drop all metadata we parsed and which is not required by libvorbis |
| unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1; |
| if (new_len >= 16 && new_len < os->psize) { |
| AV_WL32(priv->packet[1] + new_len - 5, 0); |
| priv->packet[1][new_len - 1] = 1; |
| priv->len[1] = new_len; |
| } |
| } |
| } else { |
| int ret; |
| st->codec->extradata_size = |
| fixup_vorbis_headers(s, priv, &st->codec->extradata); |
| if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) { |
| av_freep(&st->codec->extradata); |
| st->codec->extradata_size = 0; |
| return ret; |
| } |
| } |
| |
| return 1; |
| } |
| |
| static int vorbis_packet(AVFormatContext *s, int idx) |
| { |
| struct ogg *ogg = s->priv_data; |
| struct ogg_stream *os = ogg->streams + idx; |
| struct oggvorbis_private *priv = os->private; |
| int duration; |
| |
| /* first packet handling |
| here we parse the duration of each packet in the first page and compare |
| the total duration to the page granule to find the encoder delay and |
| set the first timestamp */ |
| if ((!os->lastpts || os->lastpts == AV_NOPTS_VALUE) && !(os->flags & OGG_FLAG_EOS)) { |
| int seg, d; |
| uint8_t *last_pkt = os->buf + os->pstart; |
| uint8_t *next_pkt = last_pkt; |
| |
| avpriv_vorbis_parse_reset(&priv->vp); |
| duration = 0; |
| seg = os->segp; |
| d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1); |
| if (d < 0) { |
| os->pflags |= AV_PKT_FLAG_CORRUPT; |
| return 0; |
| } |
| duration += d; |
| last_pkt = next_pkt = next_pkt + os->psize; |
| for (; seg < os->nsegs; seg++) { |
| if (os->segments[seg] < 255) { |
| int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1); |
| if (d < 0) { |
| duration = os->granule; |
| break; |
| } |
| duration += d; |
| last_pkt = next_pkt + os->segments[seg]; |
| } |
| next_pkt += os->segments[seg]; |
| } |
| os->lastpts = os->lastdts = os->granule - duration; |
| if(s->streams[idx]->start_time == AV_NOPTS_VALUE) { |
| s->streams[idx]->start_time = FFMAX(os->lastpts, 0); |
| if (s->streams[idx]->duration) |
| s->streams[idx]->duration -= s->streams[idx]->start_time; |
| } |
| priv->final_pts = AV_NOPTS_VALUE; |
| avpriv_vorbis_parse_reset(&priv->vp); |
| } |
| |
| /* parse packet duration */ |
| if (os->psize > 0) { |
| duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1); |
| if (duration < 0) { |
| os->pflags |= AV_PKT_FLAG_CORRUPT; |
| return 0; |
| } |
| os->pduration = duration; |
| } |
| |
| /* final packet handling |
| here we save the pts of the first packet in the final page, sum up all |
| packet durations in the final page except for the last one, and compare |
| to the page granule to find the duration of the final packet */ |
| if (os->flags & OGG_FLAG_EOS) { |
| if (os->lastpts != AV_NOPTS_VALUE) { |
| priv->final_pts = os->lastpts; |
| priv->final_duration = 0; |
| } |
| if (os->segp == os->nsegs) |
| os->pduration = os->granule - priv->final_pts - priv->final_duration; |
| priv->final_duration += os->pduration; |
| } |
| |
| return 0; |
| } |
| |
| const struct ogg_codec ff_vorbis_codec = { |
| .magic = "\001vorbis", |
| .magicsize = 7, |
| .header = vorbis_header, |
| .packet = vorbis_packet, |
| .cleanup= vorbis_cleanup, |
| .nb_header = 3, |
| }; |
