mirror of
https://git.videolan.org/git/ffmpeg.git
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206 lines
6.0 KiB
C
206 lines
6.0 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 "avformat.h"
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#include "bitstream.h"
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#include "bswap.h"
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#include "ogg2.h"
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extern int
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vorbis_comment (AVFormatContext * as, char *buf, int size)
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{
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char *p = buf;
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int s, n, j;
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if (size < 4)
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return -1;
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s = le2me_32 (unaligned32 (p));
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p += 4;
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size -= 4;
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if (size < s + 4)
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return -1;
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p += s;
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size -= s;
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n = le2me_32 (unaligned32 (p));
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p += 4;
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size -= 4;
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while (size >= 4){
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char *t, *v;
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int tl, vl;
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s = le2me_32 (unaligned32 (p));
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p += 4;
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size -= 4;
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if (size < s)
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break;
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t = p;
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p += s;
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size -= 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[tl + 1];
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char ct[vl + 1];
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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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// took from Vorbis_I_spec
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if (!strcmp (tt, "AUTHOR"))
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strncpy (as->author, ct, FFMIN(sizeof (as->author), vl));
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else if (!strcmp (tt, "TITLE"))
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strncpy (as->title, ct, FFMIN(sizeof (as->title), vl));
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else if (!strcmp (tt, "COPYRIGHT"))
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strncpy (as->copyright, ct, FFMIN(sizeof (as->copyright), vl));
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else if (!strcmp (tt, "DESCRIPTION"))
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strncpy (as->comment, ct, FFMIN(sizeof (as->comment), vl));
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else if (!strcmp (tt, "GENRE"))
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strncpy (as->genre, ct, FFMIN(sizeof (as->genre), vl));
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else if (!strcmp (tt, "TRACKNUMBER"))
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as->track = atoi (ct);
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//Too bored to add others for today
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}
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}
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if (size > 0)
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av_log (as, AV_LOG_INFO, "%i bytes of comment header remain\n", size);
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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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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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typedef struct {
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unsigned int len[3];
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unsigned char *packet[3];
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} oggvorbis_private_t;
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static unsigned int
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fixup_vorbis_headers(AVFormatContext * as, oggvorbis_private_t *priv,
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void **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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}
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*buf = av_realloc(*buf, offset);
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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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ogg_t *ogg = s->priv_data;
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ogg_stream_t *os = ogg->streams + idx;
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AVStream *st = s->streams[idx];
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oggvorbis_private_t *priv;
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if (os->seq > 2)
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return 0;
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if(os->seq == 0) {
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os->private = av_mallocz(sizeof(oggvorbis_private_t));
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if(!os->private)
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return 0;
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}
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priv = os->private;
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priv->len[os->seq] = os->psize;
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priv->packet[os->seq] = av_mallocz(os->psize);
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memcpy(priv->packet[os->seq], os->buf + os->pstart, os->psize);
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if (os->buf[os->pstart] == 1) {
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uint8_t *p = os->buf + os->pstart + 11; //skip up to the audio channels
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st->codec->channels = *p++;
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st->codec->sample_rate = le2me_32 (unaligned32 (p));
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p += 8; //skip maximum and and nominal bitrate
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st->codec->bit_rate = le2me_32 (unaligned32 (p)); //Minimum bitrate
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st->codec->codec_type = CODEC_TYPE_AUDIO;
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st->codec->codec_id = CODEC_ID_VORBIS;
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st->time_base.num = 1;
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st->time_base.den = st->codec->sample_rate;
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} else if (os->buf[os->pstart] == 3) {
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vorbis_comment (s, os->buf + os->pstart + 7, os->psize - 8);
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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 os->seq < 3;
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}
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ogg_codec_t 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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