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https://github.com/FFmpeg/FFmpeg.git
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f63412fc74
Takes encoder delay into account by comparing first the coded page duration with the calculated page duration. Handles last packet duration if needed, also by comparing coded duration with calculated duration. Also does better handling of timestamp generation for packets in the first page for streamed ogg files where the start time is not necessarily zero.
363 lines
11 KiB
C
363 lines
11 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 "libavcodec/vorbis_parser.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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VorbisParseContext vp;
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int64_t final_pts;
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int final_duration;
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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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avpriv_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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int ret;
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st->codec->extradata_size =
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fixup_vorbis_headers(s, priv, &st->codec->extradata);
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if ((ret = avpriv_vorbis_parse_extradata(st->codec, &priv->vp))) {
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av_freep(&st->codec->extradata);
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st->codec->extradata_size = 0;
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return ret;
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}
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}
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return 1;
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}
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static int vorbis_packet(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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struct oggvorbis_private *priv = os->private;
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int duration;
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/* first packet handling
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here we parse the duration of each packet in the first page and compare
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the total duration to the page granule to find the encoder delay and
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set the first timestamp */
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if (!os->lastpts) {
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int seg;
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uint8_t *last_pkt = os->buf + os->pstart;
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uint8_t *next_pkt = last_pkt;
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int first_duration = 0;
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avpriv_vorbis_parse_reset(&priv->vp);
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duration = 0;
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for (seg = 0; seg < os->nsegs; seg++) {
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if (os->segments[seg] < 255) {
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int d = avpriv_vorbis_parse_frame(&priv->vp, last_pkt, 1);
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if (d < 0) {
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duration = os->granule;
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break;
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}
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if (!duration)
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first_duration = d;
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duration += d;
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last_pkt = next_pkt + os->segments[seg];
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}
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next_pkt += os->segments[seg];
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}
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os->lastpts = os->lastdts = os->granule - duration;
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s->streams[idx]->start_time = os->lastpts + first_duration;
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if (s->streams[idx]->duration)
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s->streams[idx]->duration -= s->streams[idx]->start_time;
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s->streams[idx]->cur_dts = AV_NOPTS_VALUE;
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priv->final_pts = AV_NOPTS_VALUE;
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avpriv_vorbis_parse_reset(&priv->vp);
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}
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/* parse packet duration */
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if (os->psize > 0) {
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duration = avpriv_vorbis_parse_frame(&priv->vp, os->buf + os->pstart, 1);
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if (duration <= 0) {
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os->pflags |= AV_PKT_FLAG_CORRUPT;
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return 0;
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}
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os->pduration = duration;
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}
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/* final packet handling
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here we save the pts of the first packet in the final page, sum up all
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packet durations in the final page except for the last one, and compare
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to the page granule to find the duration of the final packet */
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if (os->flags & OGG_FLAG_EOS) {
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if (os->lastpts != AV_NOPTS_VALUE) {
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priv->final_pts = os->lastpts;
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priv->final_duration = 0;
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}
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if (os->segp == os->nsegs)
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os->pduration = os->granule - priv->final_pts - priv->final_duration;
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priv->final_duration += os->pduration;
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}
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return 0;
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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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.packet = vorbis_packet,
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};
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