mirror of
https://github.com/FFmpeg/FFmpeg.git
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283 lines
8.2 KiB
C
283 lines
8.2 KiB
C
/**
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Copyright (C) 2005 Michael Ahlberg, Måns Rullgård
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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**/
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#include <stdlib.h>
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#include "libavutil/avstring.h"
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#include "libavutil/bswap.h"
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#include "libavutil/dict.h"
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#include "libavcodec/get_bits.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "internal.h"
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#include "oggdec.h"
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#include "vorbiscomment.h"
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static int ogm_chapter(AVFormatContext *as, uint8_t *key, uint8_t *val)
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{
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int i, cnum, h, m, s, ms, keylen = strlen(key);
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AVChapter *chapter = NULL;
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if (keylen < 9 || sscanf(key, "CHAPTER%02d", &cnum) != 1)
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return 0;
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if (keylen == 9) {
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if (sscanf(val, "%02d:%02d:%02d.%03d", &h, &m, &s, &ms) < 4)
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return 0;
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avpriv_new_chapter(as, cnum, (AVRational){1,1000},
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ms + 1000*(s + 60*(m + 60*h)),
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AV_NOPTS_VALUE, NULL);
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av_free(val);
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} else if (!strcmp(key+9, "NAME")) {
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for(i = 0; i < as->nb_chapters; i++)
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if (as->chapters[i]->id == cnum) {
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chapter = as->chapters[i];
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break;
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}
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if (!chapter)
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return 0;
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av_dict_set(&chapter->metadata, "title", val,
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AV_DICT_DONT_STRDUP_VAL);
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} else
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return 0;
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av_free(key);
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return 1;
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}
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int
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ff_vorbis_comment(AVFormatContext * as, AVDictionary **m, const uint8_t *buf, int size)
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{
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const uint8_t *p = buf;
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const uint8_t *end = buf + size;
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unsigned n, j;
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int s;
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if (size < 8) /* must have vendor_length and user_comment_list_length */
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return -1;
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s = bytestream_get_le32(&p);
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if (end - p - 4 < s || s < 0)
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return -1;
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p += s;
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n = bytestream_get_le32(&p);
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while (end - p >= 4 && n > 0) {
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const char *t, *v;
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int tl, vl;
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s = bytestream_get_le32(&p);
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if (end - p < s || s < 0)
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break;
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t = p;
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p += s;
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n--;
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v = memchr(t, '=', s);
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if (!v)
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continue;
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tl = v - t;
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vl = s - tl - 1;
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v++;
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if (tl && vl) {
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char *tt, *ct;
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tt = av_malloc(tl + 1);
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ct = av_malloc(vl + 1);
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if (!tt || !ct) {
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av_freep(&tt);
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av_freep(&ct);
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av_log(as, AV_LOG_WARNING, "out-of-memory error. skipping VorbisComment tag.\n");
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continue;
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}
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for (j = 0; j < tl; j++)
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tt[j] = toupper(t[j]);
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tt[tl] = 0;
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memcpy(ct, v, vl);
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ct[vl] = 0;
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if (!ogm_chapter(as, tt, ct))
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av_dict_set(m, tt, ct,
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AV_DICT_DONT_STRDUP_KEY |
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AV_DICT_DONT_STRDUP_VAL);
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}
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}
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if (p != end)
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av_log(as, AV_LOG_INFO, "%ti bytes of comment header remain\n", end-p);
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if (n > 0)
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av_log(as, AV_LOG_INFO,
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"truncated comment header, %i comments not found\n", n);
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ff_metadata_conv(m, NULL, ff_vorbiscomment_metadata_conv);
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return 0;
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}
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/** Parse the vorbis header
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* Vorbis Identification header from Vorbis_I_spec.html#vorbis-spec-codec
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* [vorbis_version] = read 32 bits as unsigned integer | Not used
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* [audio_channels] = read 8 bit integer as unsigned | Used
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* [audio_sample_rate] = read 32 bits as unsigned integer | Used
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* [bitrate_maximum] = read 32 bits as signed integer | Not used yet
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* [bitrate_nominal] = read 32 bits as signed integer | Not used yet
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* [bitrate_minimum] = read 32 bits as signed integer | Used as bitrate
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* [blocksize_0] = read 4 bits as unsigned integer | Not Used
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* [blocksize_1] = read 4 bits as unsigned integer | Not Used
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* [framing_flag] = read one bit | Not Used
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* */
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struct oggvorbis_private {
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unsigned int len[3];
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unsigned char *packet[3];
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};
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static unsigned int
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fixup_vorbis_headers(AVFormatContext * as, struct oggvorbis_private *priv,
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uint8_t **buf)
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{
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int i,offset, len;
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unsigned char *ptr;
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len = priv->len[0] + priv->len[1] + priv->len[2];
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ptr = *buf = av_mallocz(len + len/255 + 64);
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ptr[0] = 2;
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offset = 1;
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offset += av_xiphlacing(&ptr[offset], priv->len[0]);
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offset += av_xiphlacing(&ptr[offset], priv->len[1]);
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for (i = 0; i < 3; i++) {
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memcpy(&ptr[offset], priv->packet[i], priv->len[i]);
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offset += priv->len[i];
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av_freep(&priv->packet[i]);
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}
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*buf = av_realloc(*buf, offset + FF_INPUT_BUFFER_PADDING_SIZE);
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return offset;
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}
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static int
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vorbis_header (AVFormatContext * s, int idx)
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{
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struct ogg *ogg = s->priv_data;
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struct ogg_stream *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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struct oggvorbis_private *priv;
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int pkt_type = os->buf[os->pstart];
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if (!(pkt_type & 1))
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return 0;
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if (!os->private) {
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os->private = av_mallocz(sizeof(struct oggvorbis_private));
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if (!os->private)
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return 0;
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}
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if (os->psize < 1 || pkt_type > 5)
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return -1;
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priv = os->private;
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if (priv->packet[pkt_type>>1])
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return -1;
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if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
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return -1;
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priv->len[pkt_type >> 1] = os->psize;
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priv->packet[pkt_type >> 1] = av_mallocz(os->psize);
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memcpy(priv->packet[pkt_type >> 1], os->buf + os->pstart, os->psize);
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if (os->buf[os->pstart] == 1) {
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const uint8_t *p = os->buf + os->pstart + 7; /* skip "\001vorbis" tag */
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unsigned blocksize, bs0, bs1;
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int srate;
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if (os->psize != 30)
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return -1;
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if (bytestream_get_le32(&p) != 0) /* vorbis_version */
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return -1;
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st->codec->channels = bytestream_get_byte(&p);
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srate = bytestream_get_le32(&p);
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p += 4; // skip maximum bitrate
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st->codec->bit_rate = bytestream_get_le32(&p); // nominal bitrate
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p += 4; // skip minimum bitrate
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blocksize = bytestream_get_byte(&p);
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bs0 = blocksize & 15;
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bs1 = blocksize >> 4;
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if (bs0 > bs1)
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return -1;
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if (bs0 < 6 || bs1 > 13)
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return -1;
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if (bytestream_get_byte(&p) != 1) /* framing_flag */
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return -1;
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_VORBIS;
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if (srate > 0) {
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st->codec->sample_rate = srate;
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av_set_pts_info(st, 64, 1, srate);
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}
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} else if (os->buf[os->pstart] == 3) {
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if (os->psize > 8 &&
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ff_vorbis_comment(s, &st->metadata, os->buf + os->pstart + 7, os->psize - 8) >= 0) {
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// drop all metadata we parsed and which is not required by libvorbis
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unsigned new_len = 7 + 4 + AV_RL32(priv->packet[1] + 7) + 4 + 1;
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if (new_len >= 16 && new_len < os->psize) {
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AV_WL32(priv->packet[1] + new_len - 5, 0);
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priv->packet[1][new_len - 1] = 1;
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priv->len[1] = new_len;
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}
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}
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} else {
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st->codec->extradata_size =
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fixup_vorbis_headers(s, priv, &st->codec->extradata);
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}
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return 1;
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}
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const struct ogg_codec ff_vorbis_codec = {
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.magic = "\001vorbis",
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.magicsize = 7,
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.header = vorbis_header
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};
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