| /** |
| 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/bswap.h" |
| #include "libavcodec/bitstream.h" |
| #include "libavcodec/bytestream.h" |
| #include "avformat.h" |
| #include "oggdec.h" |
| |
| int |
| vorbis_comment(AVFormatContext * as, uint8_t *buf, int size) |
| { |
| const uint8_t *p = buf; |
| const uint8_t *end = buf + size; |
| unsigned s, n, j; |
| |
| if (size < 8) /* must have vendor_length and user_comment_list_length */ |
| return -1; |
| |
| s = bytestream_get_le32(&p); |
| |
| if (end - p < s) |
| return -1; |
| |
| p += s; |
| |
| n = bytestream_get_le32(&p); |
| |
| while (p < end && n > 0) { |
| const char *t, *v; |
| int tl, vl; |
| |
| s = bytestream_get_le32(&p); |
| |
| if (end - p < s) |
| 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; |
| } |
| |
| // DrD: Don't convert to uppercase... |
| // for (j = 0; j < tl; j++) |
| // tt[j] = toupper(t[j]); |
| memcpy(tt, t, tl); |
| tt[tl] = 0; |
| |
| memcpy(ct, v, vl); |
| ct[vl] = 0; |
| |
| av_metadata_set(&as->metadata, tt, ct); |
| |
| av_freep(&tt); |
| av_freep(&ct); |
| } |
| } |
| |
| if (p != end) |
| av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", p-end); |
| if (n > 0) |
| av_log(as, AV_LOG_INFO, |
| "truncated comment header, %i comments not found\n", n); |
| |
| 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]; |
| }; |
| |
| |
| static unsigned int |
| fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv, |
| uint8_t **buf) |
| { |
| int i,offset, len; |
| unsigned char *ptr; |
| |
| len = priv->len[0] + priv->len[1] + priv->len[2]; |
| ptr = *buf = av_mallocz(len + len/255 + 64); |
| |
| 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]; |
| } |
| *buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE); |
| return offset; |
| } |
| |
| |
| 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; |
| |
| if (os->seq > 2) |
| return 0; |
| |
| if (os->seq == 0) { |
| os->private = av_mallocz(sizeof(struct oggvorbis_private)); |
| if (!os->private) |
| return 0; |
| } |
| |
| if (os->psize < 1) |
| return -1; |
| |
| priv = os->private; |
| priv->len[os->seq] = os->psize; |
| priv->packet[os->seq] = av_mallocz(os->psize); |
| memcpy(priv->packet[os->seq], 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; |
| |
| if (os->psize != 30) |
| return -1; |
| |
| if (bytestream_get_le32(&p) != 0) /* vorbis_version */ |
| return -1; |
| |
| st->codec->channels = bytestream_get_byte(&p); |
| st->codec->sample_rate = 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 = CODEC_TYPE_AUDIO; |
| st->codec->codec_id = CODEC_ID_VORBIS; |
| |
| st->time_base.num = 1; |
| st->time_base.den = st->codec->sample_rate; |
| } else if (os->buf[os->pstart] == 3) { |
| if (os->psize > 8) |
| vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8); |
| } else { |
| st->codec->extradata_size = |
| fixup_vorbis_headers(s, priv, &st->codec->extradata); |
| } |
| |
| return os->seq < 3; |
| } |
| |
| const struct ogg_codec ff_vorbis_codec = { |
| .magic = "\001vorbis", |
| .magicsize = 7, |
| .header = vorbis_header |
| }; |