Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

602 lines (516 sloc) 20.154 kb
/*
* Ogg muxer
* Copyright (c) 2007 Baptiste Coudurier <baptiste dot coudurier at free dot fr>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/crc.h"
#include "libavutil/opt.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavutil/random_seed.h"
#include "libavcodec/xiph.h"
#include "libavcodec/bytestream.h"
#include "libavcodec/flac.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "vorbiscomment.h"
#define MAX_PAGE_SIZE 65025
typedef struct {
int64_t granule;
int stream_index;
uint8_t flags;
uint8_t segments_count;
uint8_t segments[255];
uint8_t data[MAX_PAGE_SIZE];
uint16_t size;
} OGGPage;
typedef struct {
unsigned page_counter;
uint8_t *header[3];
int header_len[3];
/** for theora granule */
int kfgshift;
int64_t last_kf_pts;
int vrev;
int eos;
unsigned page_count; ///< number of page buffered
OGGPage page; ///< current page
unsigned serial_num; ///< serial number
int64_t last_granule; ///< last packet granule
} OGGStreamContext;
typedef struct OGGPageList {
OGGPage page;
struct OGGPageList *next;
} OGGPageList;
typedef struct {
const AVClass *class;
OGGPageList *page_list;
int pref_size; ///< preferred page size (0 => fill all segments)
} OGGContext;
#define OFFSET(x) offsetof(OGGContext, x)
#define PARAM AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "oggpagesize", "Set preferred Ogg page size.",
offsetof(OGGContext, pref_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, MAX_PAGE_SIZE, AV_OPT_FLAG_ENCODING_PARAM},
{ "pagesize", "preferred page size in bytes",
OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM },
{ NULL },
};
static const AVClass ogg_muxer_class = {
.class_name = "Ogg muxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
static void ogg_update_checksum(AVFormatContext *s, AVIOContext *pb, int64_t crc_offset)
{
int64_t pos = avio_tell(pb);
uint32_t checksum = ffio_get_checksum(pb);
avio_seek(pb, crc_offset, SEEK_SET);
avio_wb32(pb, checksum);
avio_seek(pb, pos, SEEK_SET);
}
static int ogg_write_page(AVFormatContext *s, OGGPage *page, int extra_flags)
{
OGGStreamContext *oggstream = s->streams[page->stream_index]->priv_data;
AVIOContext *pb;
int64_t crc_offset;
int ret, size;
uint8_t *buf;
ret = avio_open_dyn_buf(&pb);
if (ret < 0)
return ret;
ffio_init_checksum(pb, ff_crc04C11DB7_update, 0);
ffio_wfourcc(pb, "OggS");
avio_w8(pb, 0);
avio_w8(pb, page->flags | extra_flags);
avio_wl64(pb, page->granule);
avio_wl32(pb, oggstream->serial_num);
avio_wl32(pb, oggstream->page_counter++);
crc_offset = avio_tell(pb);
avio_wl32(pb, 0); // crc
avio_w8(pb, page->segments_count);
avio_write(pb, page->segments, page->segments_count);
avio_write(pb, page->data, page->size);
ogg_update_checksum(s, pb, crc_offset);
avio_flush(pb);
size = avio_close_dyn_buf(pb, &buf);
if (size < 0)
return size;
avio_write(s->pb, buf, size);
avio_flush(s->pb);
av_free(buf);
oggstream->page_count--;
return 0;
}
static int ogg_key_granule(OGGStreamContext *oggstream, int64_t granule)
{
return oggstream->kfgshift && !(granule & ((1<<oggstream->kfgshift)-1));
}
static int64_t ogg_granule_to_timestamp(OGGStreamContext *oggstream, int64_t granule)
{
if (oggstream->kfgshift)
return (granule>>oggstream->kfgshift) +
(granule & ((1<<oggstream->kfgshift)-1));
else
return granule;
}
static int ogg_compare_granule(AVFormatContext *s, OGGPage *next, OGGPage *page)
{
AVStream *st2 = s->streams[next->stream_index];
AVStream *st = s->streams[page->stream_index];
int64_t next_granule, cur_granule;
if (next->granule == -1 || page->granule == -1)
return 0;
next_granule = av_rescale_q(ogg_granule_to_timestamp(st2->priv_data, next->granule),
st2->time_base, AV_TIME_BASE_Q);
cur_granule = av_rescale_q(ogg_granule_to_timestamp(st->priv_data, page->granule),
st ->time_base, AV_TIME_BASE_Q);
return next_granule > cur_granule;
}
static int ogg_reset_cur_page(OGGStreamContext *oggstream)
{
oggstream->page.granule = -1;
oggstream->page.flags = 0;
oggstream->page.segments_count = 0;
oggstream->page.size = 0;
return 0;
}
static int ogg_buffer_page(AVFormatContext *s, OGGStreamContext *oggstream)
{
OGGContext *ogg = s->priv_data;
OGGPageList **p = &ogg->page_list;
OGGPageList *l = av_mallocz(sizeof(*l));
if (!l)
return AVERROR(ENOMEM);
l->page = oggstream->page;
oggstream->page_count++;
ogg_reset_cur_page(oggstream);
while (*p) {
if (ogg_compare_granule(s, &(*p)->page, &l->page))
break;
p = &(*p)->next;
}
l->next = *p;
*p = l;
return 0;
}
static int ogg_buffer_data(AVFormatContext *s, AVStream *st,
uint8_t *data, unsigned size, int64_t granule,
int header)
{
OGGStreamContext *oggstream = st->priv_data;
OGGContext *ogg = s->priv_data;
int total_segments = size / 255 + 1;
uint8_t *p = data;
int i, segments, len, flush = 0;
// Handles VFR by flushing page because this frame needs to have a timestamp
// For theora, keyframes also need to have a timestamp to correctly mark
// them as such, otherwise seeking will not work correctly at the very
// least with old libogg versions.
// Do not try to flush header packets though, that will create broken files.
if (st->codec->codec_id == AV_CODEC_ID_THEORA && !header &&
(ogg_granule_to_timestamp(oggstream, granule) >
ogg_granule_to_timestamp(oggstream, oggstream->last_granule) + 1 ||
ogg_key_granule(oggstream, granule))) {
if (oggstream->page.granule != -1)
ogg_buffer_page(s, oggstream);
flush = 1;
}
for (i = 0; i < total_segments; ) {
OGGPage *page = &oggstream->page;
segments = FFMIN(total_segments - i, 255 - page->segments_count);
if (i && !page->segments_count)
page->flags |= 1; // continued packet
memset(page->segments+page->segments_count, 255, segments - 1);
page->segments_count += segments - 1;
len = FFMIN(size, segments*255);
page->segments[page->segments_count++] = len - (segments-1)*255;
memcpy(page->data+page->size, p, len);
p += len;
size -= len;
i += segments;
page->size += len;
if (i == total_segments)
page->granule = granule;
if (!header && (page->segments_count == 255 ||
(ogg->pref_size > 0 && page->size >= ogg->pref_size))) {
ogg_buffer_page(s, oggstream);
}
}
if (flush && oggstream->page.granule != -1)
ogg_buffer_page(s, oggstream);
return 0;
}
static uint8_t *ogg_write_vorbiscomment(int offset, int bitexact,
int *header_len, AVDictionary **m, int framing_bit)
{
const char *vendor = bitexact ? "ffmpeg" : LIBAVFORMAT_IDENT;
int size;
uint8_t *p, *p0;
unsigned int count;
ff_metadata_conv(m, ff_vorbiscomment_metadata_conv, NULL);
size = offset + ff_vorbiscomment_length(*m, vendor, &count) + framing_bit;
p = av_mallocz(size);
if (!p)
return NULL;
p0 = p;
p += offset;
ff_vorbiscomment_write(&p, m, vendor, count);
if (framing_bit)
bytestream_put_byte(&p, 1);
*header_len = size;
return p0;
}
static int ogg_build_flac_headers(AVCodecContext *avctx,
OGGStreamContext *oggstream, int bitexact,
AVDictionary **m)
{
enum FLACExtradataFormat format;
uint8_t *streaminfo;
uint8_t *p;
if (!avpriv_flac_is_extradata_valid(avctx, &format, &streaminfo))
return -1;
// first packet: STREAMINFO
oggstream->header_len[0] = 51;
oggstream->header[0] = av_mallocz(51); // per ogg flac specs
p = oggstream->header[0];
if (!p)
return AVERROR(ENOMEM);
bytestream_put_byte(&p, 0x7F);
bytestream_put_buffer(&p, "FLAC", 4);
bytestream_put_byte(&p, 1); // major version
bytestream_put_byte(&p, 0); // minor version
bytestream_put_be16(&p, 1); // headers packets without this one
bytestream_put_buffer(&p, "fLaC", 4);
bytestream_put_byte(&p, 0x00); // streaminfo
bytestream_put_be24(&p, 34);
bytestream_put_buffer(&p, streaminfo, FLAC_STREAMINFO_SIZE);
// second packet: VorbisComment
p = ogg_write_vorbiscomment(4, bitexact, &oggstream->header_len[1], m, 0);
if (!p)
return AVERROR(ENOMEM);
oggstream->header[1] = p;
bytestream_put_byte(&p, 0x84); // last metadata block and vorbis comment
bytestream_put_be24(&p, oggstream->header_len[1] - 4);
return 0;
}
#define SPEEX_HEADER_SIZE 80
static int ogg_build_speex_headers(AVCodecContext *avctx,
OGGStreamContext *oggstream, int bitexact,
AVDictionary **m)
{
uint8_t *p;
if (avctx->extradata_size < SPEEX_HEADER_SIZE)
return -1;
// first packet: Speex header
p = av_mallocz(SPEEX_HEADER_SIZE);
if (!p)
return AVERROR(ENOMEM);
oggstream->header[0] = p;
oggstream->header_len[0] = SPEEX_HEADER_SIZE;
bytestream_put_buffer(&p, avctx->extradata, SPEEX_HEADER_SIZE);
AV_WL32(&oggstream->header[0][68], 0); // set extra_headers to 0
// second packet: VorbisComment
p = ogg_write_vorbiscomment(0, bitexact, &oggstream->header_len[1], m, 0);
if (!p)
return AVERROR(ENOMEM);
oggstream->header[1] = p;
return 0;
}
#define OPUS_HEADER_SIZE 19
static int ogg_build_opus_headers(AVCodecContext *avctx,
OGGStreamContext *oggstream, int bitexact,
AVDictionary **m)
{
uint8_t *p;
if (avctx->extradata_size < OPUS_HEADER_SIZE)
return -1;
/* first packet: Opus header */
p = av_mallocz(avctx->extradata_size);
if (!p)
return AVERROR(ENOMEM);
oggstream->header[0] = p;
oggstream->header_len[0] = avctx->extradata_size;
bytestream_put_buffer(&p, avctx->extradata, avctx->extradata_size);
/* second packet: VorbisComment */
p = ogg_write_vorbiscomment(8, bitexact, &oggstream->header_len[1], m, 0);
if (!p)
return AVERROR(ENOMEM);
oggstream->header[1] = p;
bytestream_put_buffer(&p, "OpusTags", 8);
return 0;
}
static int ogg_write_header(AVFormatContext *s)
{
OGGStreamContext *oggstream;
int i, j;
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
unsigned serial_num = i;
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
if (st->codec->codec_id == AV_CODEC_ID_OPUS)
/* Opus requires a fixed 48kHz clock */
avpriv_set_pts_info(st, 64, 1, 48000);
else
avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO)
avpriv_set_pts_info(st, 64, st->codec->time_base.num, st->codec->time_base.den);
if (st->codec->codec_id != AV_CODEC_ID_VORBIS &&
st->codec->codec_id != AV_CODEC_ID_THEORA &&
st->codec->codec_id != AV_CODEC_ID_SPEEX &&
st->codec->codec_id != AV_CODEC_ID_FLAC &&
st->codec->codec_id != AV_CODEC_ID_OPUS) {
av_log(s, AV_LOG_ERROR, "Unsupported codec id in stream %d\n", i);
return -1;
}
if (!st->codec->extradata || !st->codec->extradata_size) {
av_log(s, AV_LOG_ERROR, "No extradata present\n");
return -1;
}
oggstream = av_mallocz(sizeof(*oggstream));
oggstream->page.stream_index = i;
if (!(st->codec->flags & CODEC_FLAG_BITEXACT))
do {
serial_num = av_get_random_seed();
for (j = 0; j < i; j++) {
OGGStreamContext *sc = s->streams[j]->priv_data;
if (serial_num == sc->serial_num)
break;
}
} while (j < i);
oggstream->serial_num = serial_num;
st->priv_data = oggstream;
if (st->codec->codec_id == AV_CODEC_ID_FLAC) {
int err = ogg_build_flac_headers(st->codec, oggstream,
st->codec->flags & CODEC_FLAG_BITEXACT,
&s->metadata);
if (err) {
av_log(s, AV_LOG_ERROR, "Error writing FLAC headers\n");
av_freep(&st->priv_data);
return err;
}
} else if (st->codec->codec_id == AV_CODEC_ID_SPEEX) {
int err = ogg_build_speex_headers(st->codec, oggstream,
st->codec->flags & CODEC_FLAG_BITEXACT,
&s->metadata);
if (err) {
av_log(s, AV_LOG_ERROR, "Error writing Speex headers\n");
av_freep(&st->priv_data);
return err;
}
} else if (st->codec->codec_id == AV_CODEC_ID_OPUS) {
int err = ogg_build_opus_headers(st->codec, oggstream,
st->codec->flags & CODEC_FLAG_BITEXACT,
&s->metadata);
if (err) {
av_log(s, AV_LOG_ERROR, "Error writing Opus headers\n");
av_freep(&st->priv_data);
return err;
}
} else {
uint8_t *p;
const char *cstr = st->codec->codec_id == AV_CODEC_ID_VORBIS ? "vorbis" : "theora";
int header_type = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 3 : 0x81;
int framing_bit = st->codec->codec_id == AV_CODEC_ID_VORBIS ? 1 : 0;
if (avpriv_split_xiph_headers(st->codec->extradata, st->codec->extradata_size,
st->codec->codec_id == AV_CODEC_ID_VORBIS ? 30 : 42,
oggstream->header, oggstream->header_len) < 0) {
av_log(s, AV_LOG_ERROR, "Extradata corrupted\n");
av_freep(&st->priv_data);
return -1;
}
p = ogg_write_vorbiscomment(7, st->codec->flags & CODEC_FLAG_BITEXACT,
&oggstream->header_len[1], &s->metadata,
framing_bit);
oggstream->header[1] = p;
if (!p)
return AVERROR(ENOMEM);
bytestream_put_byte(&p, header_type);
bytestream_put_buffer(&p, cstr, 6);
if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
/** KFGSHIFT is the width of the less significant section of the granule position
The less significant section is the frame count since the last keyframe */
oggstream->kfgshift = ((oggstream->header[0][40]&3)<<3)|(oggstream->header[0][41]>>5);
oggstream->vrev = oggstream->header[0][9];
av_log(s, AV_LOG_DEBUG, "theora kfgshift %d, vrev %d\n",
oggstream->kfgshift, oggstream->vrev);
}
}
}
for (j = 0; j < s->nb_streams; j++) {
OGGStreamContext *oggstream = s->streams[j]->priv_data;
ogg_buffer_data(s, s->streams[j], oggstream->header[0],
oggstream->header_len[0], 0, 1);
oggstream->page.flags |= 2; // bos
ogg_buffer_page(s, oggstream);
}
for (j = 0; j < s->nb_streams; j++) {
AVStream *st = s->streams[j];
OGGStreamContext *oggstream = st->priv_data;
for (i = 1; i < 3; i++) {
if (oggstream && oggstream->header_len[i])
ogg_buffer_data(s, st, oggstream->header[i],
oggstream->header_len[i], 0, 1);
}
ogg_buffer_page(s, oggstream);
}
return 0;
}
static void ogg_write_pages(AVFormatContext *s, int flush)
{
OGGContext *ogg = s->priv_data;
OGGPageList *next, *p;
if (!ogg->page_list)
return;
for (p = ogg->page_list; p; ) {
OGGStreamContext *oggstream =
s->streams[p->page.stream_index]->priv_data;
if (oggstream->page_count < 2 && !flush)
break;
ogg_write_page(s, &p->page,
flush && oggstream->page_count == 1 ? 4 : 0); // eos
next = p->next;
av_freep(&p);
p = next;
}
ogg->page_list = p;
}
static int ogg_write_packet(AVFormatContext *s, AVPacket *pkt)
{
AVStream *st = s->streams[pkt->stream_index];
OGGStreamContext *oggstream = st->priv_data;
int ret;
int64_t granule;
if (st->codec->codec_id == AV_CODEC_ID_THEORA) {
int64_t pts = oggstream->vrev < 1 ? pkt->pts : pkt->pts + pkt->duration;
int pframe_count;
if (pkt->flags & AV_PKT_FLAG_KEY)
oggstream->last_kf_pts = pts;
pframe_count = pts - oggstream->last_kf_pts;
// prevent frame count from overflow if key frame flag is not set
if (pframe_count >= (1<<oggstream->kfgshift)) {
oggstream->last_kf_pts += pframe_count;
pframe_count = 0;
}
granule = (oggstream->last_kf_pts<<oggstream->kfgshift) | pframe_count;
} else if (st->codec->codec_id == AV_CODEC_ID_OPUS)
granule = pkt->pts + pkt->duration + av_rescale_q(st->codec->delay, (AVRational){ 1, st->codec->sample_rate }, st->time_base);
else
granule = pkt->pts + pkt->duration;
ret = ogg_buffer_data(s, st, pkt->data, pkt->size, granule, 0);
if (ret < 0)
return ret;
ogg_write_pages(s, 0);
oggstream->last_granule = granule;
return 0;
}
static int ogg_write_trailer(AVFormatContext *s)
{
int i;
/* flush current page */
for (i = 0; i < s->nb_streams; i++)
ogg_buffer_page(s, s->streams[i]->priv_data);
ogg_write_pages(s, 1);
for (i = 0; i < s->nb_streams; i++) {
AVStream *st = s->streams[i];
OGGStreamContext *oggstream = st->priv_data;
if (st->codec->codec_id == AV_CODEC_ID_FLAC ||
st->codec->codec_id == AV_CODEC_ID_SPEEX ||
st->codec->codec_id == AV_CODEC_ID_OPUS) {
av_freep(&oggstream->header[0]);
}
av_freep(&oggstream->header[1]);
av_freep(&st->priv_data);
}
return 0;
}
AVOutputFormat ff_ogg_muxer = {
.name = "ogg",
.long_name = NULL_IF_CONFIG_SMALL("Ogg"),
.mime_type = "application/ogg",
.extensions = "ogg,ogv,spx,opus",
.priv_data_size = sizeof(OGGContext),
.audio_codec = AV_CODEC_ID_FLAC,
.video_codec = AV_CODEC_ID_THEORA,
.write_header = ogg_write_header,
.write_packet = ogg_write_packet,
.write_trailer = ogg_write_trailer,
.priv_class = &ogg_muxer_class,
};
Jump to Line
Something went wrong with that request. Please try again.