0,0 → 1,638 |
/* |
* 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/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 start_granule; |
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) |
int64_t pref_duration; ///< preferred page duration (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 (deprecated)", |
OFFSET(pref_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, MAX_PAGE_SIZE, PARAM }, |
{ "page_duration", "preferred page duration, in microseconds", |
OFFSET(pref_duration), AV_OPT_TYPE_INT64, { .i64 = 1000000 }, 0, INT64_MAX, 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.start_granule = oggstream->page.granule; |
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; |
} |
|
// avoid a continued page |
if (!header && oggstream->page.size > 0 && |
MAX_PAGE_SIZE - oggstream->page.size < size) { |
ogg_buffer_page(s, oggstream); |
} |
|
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) { |
AVStream *st = s->streams[page->stream_index]; |
|
int64_t start = av_rescale_q(page->start_granule, st->time_base, |
AV_TIME_BASE_Q); |
int64_t next = av_rescale_q(page->granule, st->time_base, |
AV_TIME_BASE_Q); |
|
if (page->segments_count == 255 || |
(ogg->pref_size > 0 && page->size >= ogg->pref_size) || |
(ogg->pref_duration > 0 && next - start >= ogg->pref_duration)) { |
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) |
{ |
OGGContext *ogg = s->priv_data; |
OGGStreamContext *oggstream = NULL; |
int i, j; |
|
if (ogg->pref_size) |
av_log(s, AV_LOG_WARNING, "The pagesize option is deprecated\n"); |
|
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; |
|
av_dict_copy(&st->metadata, s->metadata, AV_DICT_DONT_OVERWRITE); |
|
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, |
&st->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, |
&st->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, |
&st->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], &st->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->header_len[i]) |
ogg_buffer_data(s, st, oggstream->header[i], |
oggstream->header_len[i], 0, 1); |
} |
ogg_buffer_page(s, oggstream); |
} |
|
oggstream->page.start_granule = AV_NOPTS_VALUE; |
|
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; |
|
if (oggstream->page.start_granule == AV_NOPTS_VALUE) |
oggstream->page.start_granule = pkt->pts; |
|
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 if needed */ |
for (i = 0; i < s->nb_streams; i++) { |
OGGStreamContext *oggstream = s->streams[i]->priv_data; |
|
if (oggstream->page.size > 0) |
ogg_buffer_page(s, oggstream); |
} |
|
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, |
.flags = AVFMT_TS_NEGATIVE, |
.priv_class = &ogg_muxer_class, |
}; |