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ffmpeg/libavformat/oggparsevorbis.c

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/*
* 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/bytestream.h"
#include "libavcodec/get_bits.h"
#include "libavcodec/vorbis_parser.h"
#include "avformat.h"
#include "flac_picture.h"
#include "internal.h"
#include "oggdec.h"
#include "vorbiscomment.h"
#include "replaygain.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%03d", &cnum) != 1)
return 0;
if (keylen <= 10) {
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 + keylen - 4, "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_stream_comment(AVFormatContext *as, AVStream *st,
const uint8_t *buf, int size)
{
int updates = ff_vorbis_comment(as, &st->metadata, buf, size, 1);
if (updates > 0) {
st->event_flags |= AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
}
return updates;
}
int ff_vorbis_comment(AVFormatContext *as, AVDictionary **m,
const uint8_t *buf, int size,
int parse_picture)
{
const uint8_t *p = buf;
const uint8_t *end = buf + size;
int updates = 0;
unsigned n, j;
int s;
/* must have vendor_length and user_comment_list_length */
if (size < 8)
return AVERROR_INVALIDDATA;
s = bytestream_get_le32(&p);
if (end - p - 4 < s || s < 0)
return AVERROR_INVALIDDATA;
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);
return AVERROR(ENOMEM);
}
for (j = 0; j < tl; j++)
tt[j] = av_toupper(t[j]);
tt[tl] = 0;
memcpy(ct, v, vl);
ct[vl] = 0;
/* The format in which the pictures are stored is the FLAC format.
* Xiph says: "The binary FLAC picture structure is base64 encoded
* and placed within a VorbisComment with the tag name
* 'METADATA_BLOCK_PICTURE'. This is the preferred and
* recommended way of embedding cover art within VorbisComments."
*/
if (!strcmp(tt, "METADATA_BLOCK_PICTURE") && parse_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(&tt);
av_freep(&ct);
av_freep(&pict);
if (ret < 0) {
av_log(as, AV_LOG_WARNING, "Failed to parse cover art block.\n");
continue;
}
} else if (!ogm_chapter(as, tt, ct)) {
updates++;
if (av_dict_get(*m, tt, NULL, 0)) {
av_dict_set(m, tt, ";", AV_DICT_APPEND);
}
av_dict_set(m, tt, ct,
AV_DICT_DONT_STRDUP_KEY |
AV_DICT_APPEND);
av_freep(&ct);
}
}
}
if (p != end)
av_log(as, AV_LOG_INFO,
"%"PTRDIFF_SPECIFIER" 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 updates;
}
/*
* 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 int fixup_vorbis_headers(AVFormatContext *as,
struct oggvorbis_private *priv,
uint8_t **buf)
{
int i, offset, len, err;
int 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 (!ptr)
return AVERROR(ENOMEM);
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]);
}
if ((err = av_reallocp(buf, offset + FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
return err;
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_update_metadata(AVFormatContext *s, int idx)
{
struct ogg *ogg = s->priv_data;
struct ogg_stream *os = ogg->streams + idx;
AVStream *st = s->streams[idx];
int ret;
if (os->psize <= 8)
return 0;
/* New metadata packet; release old data. */
av_dict_free(&st->metadata);
ret = ff_vorbis_stream_comment(s, st, os->buf + os->pstart + 7,
os->psize - 8);
if (ret < 0)
return ret;
/* Update the metadata if possible. */
av_freep(&os->new_metadata);
if (st->metadata) {
os->new_metadata = av_packet_pack_dictionary(st->metadata, &os->new_metadata_size);
/* Send an empty dictionary to indicate that metadata has been cleared. */
} else {
os->new_metadata = av_malloc(1);
os->new_metadata_size = 0;
}
return ret;
}
static int vorbis_header(AVFormatContext *s, int idx)
{
struct ogg *ogg = s->priv_data;
AVStream *st = s->streams[idx];
struct ogg_stream *os = ogg->streams + idx;
struct oggvorbis_private *priv;
int pkt_type = os->buf[os->pstart];
if (!os->private) {
os->private = av_mallocz(sizeof(struct oggvorbis_private));
if (!os->private)
return AVERROR(ENOMEM);
}
if (!(pkt_type & 1))
return 0;
if (os->psize < 1 || pkt_type > 5)
return AVERROR_INVALIDDATA;
priv = os->private;
if (priv->packet[pkt_type >> 1])
return AVERROR_INVALIDDATA;
if (pkt_type > 1 && !priv->packet[0] || pkt_type > 3 && !priv->packet[1])
return AVERROR_INVALIDDATA;
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 AVERROR_INVALIDDATA;
if (bytestream_get_le32(&p) != 0) /* vorbis_version */
return AVERROR_INVALIDDATA;
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 AVERROR_INVALIDDATA;
if (bs0 < 6 || bs1 > 13)
return AVERROR_INVALIDDATA;
if (bytestream_get_byte(&p) != 1) /* framing_flag */
return AVERROR_INVALIDDATA;
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 (vorbis_update_metadata(s, idx) >= 0 && priv->len[1] > 10) {
unsigned new_len;
int ret = ff_replaygain_export(st, st->metadata);
if (ret < 0)
return ret;
// drop all metadata we parsed and which is not required by libvorbis
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 = fixup_vorbis_headers(s, priv, &st->codec->extradata);
if (ret < 0) {
st->codec->extradata_size = 0;
return ret;
}
st->codec->extradata_size = ret;
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, flags = 0;
/* 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) && (int64_t)os->granule>=0) {
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_flags(&priv->vp, last_pkt, 1, &flags);
if (d < 0) {
os->pflags |= AV_PKT_FLAG_CORRUPT;
return 0;
} else if (flags & VORBIS_FLAG_COMMENT) {
vorbis_update_metadata(s, idx);
flags = 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_flags(&priv->vp, last_pkt, 1, &flags);
if (d < 0) {
duration = os->granule;
break;
} else if (flags & VORBIS_FLAG_COMMENT) {
vorbis_update_metadata(s, idx);
flags = 0;
}
duration += d;
last_pkt = next_pkt + os->segments[seg];
}
next_pkt += os->segments[seg];
}
os->lastpts =
os->lastdts = os->granule - duration;
if (!os->granule && duration) //hack to deal with broken files (Ticket3710)
os->lastpts = os->lastdts = AV_NOPTS_VALUE;
if (s->streams[idx]->start_time == AV_NOPTS_VALUE) {
s->streams[idx]->start_time = FFMAX(os->lastpts, 0);
if (s->streams[idx]->duration != AV_NOPTS_VALUE)
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_flags(&priv->vp, os->buf + os->pstart, 1, &flags);
if (duration < 0) {
os->pflags |= AV_PKT_FLAG_CORRUPT;
return 0;
} else if (flags & VORBIS_FLAG_COMMENT) {
vorbis_update_metadata(s, idx);
flags = 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,
};
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