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FFmpeg/libavformat/asfenc.c

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/*
* ASF muxer
* Copyright (c) 2000, 2001 Fabrice Bellard
*
* 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 "config_components.h"
#include "libavutil/avassert.h"
#include "libavutil/dict.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
#include "libavcodec/codec_desc.h"
#include "avformat.h"
#include "avlanguage.h"
#include "avio_internal.h"
#include "internal.h"
#include "mux.h"
#include "riff.h"
#include "asf.h"
#define ASF_INDEXED_INTERVAL 10000000
#define ASF_INDEX_BLOCK (1<<9)
#define ASF_PAYLOADS_PER_PACKET 63
#define ASF_PACKET_ERROR_CORRECTION_DATA_SIZE 0x2
#define ASF_PACKET_ERROR_CORRECTION_FLAGS \
(ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT | \
ASF_PACKET_ERROR_CORRECTION_DATA_SIZE)
#if (ASF_PACKET_ERROR_CORRECTION_FLAGS != 0)
# define ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE 1
#else
# define ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE 0
#endif
#define ASF_PPI_PROPERTY_FLAGS \
(ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE | \
ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD | \
ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE | \
ASF_PL_FLAG_STREAM_NUMBER_LENGTH_FIELD_IS_BYTE)
#define ASF_PPI_LENGTH_TYPE_FLAGS 0
#define ASF_PAYLOAD_FLAGS ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD
#if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
# define ASF_PPI_SEQUENCE_FIELD_SIZE 1
#endif
#if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
# define ASF_PPI_SEQUENCE_FIELD_SIZE 2
#endif
#if (ASF_PPI_FLAG_SEQUENCE_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE))
# define ASF_PPI_SEQUENCE_FIELD_SIZE 4
#endif
#ifndef ASF_PPI_SEQUENCE_FIELD_SIZE
# define ASF_PPI_SEQUENCE_FIELD_SIZE 0
#endif
#if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
# define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 1
#endif
#if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
# define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 2
#endif
#if (ASF_PPI_FLAG_PACKET_LENGTH_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE))
# define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 4
#endif
#ifndef ASF_PPI_PACKET_LENGTH_FIELD_SIZE
# define ASF_PPI_PACKET_LENGTH_FIELD_SIZE 0
#endif
#if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
# define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 1
#endif
#if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
# define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 2
#endif
#if (ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_DWORD == (ASF_PPI_LENGTH_TYPE_FLAGS & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE))
# define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 4
#endif
#ifndef ASF_PPI_PADDING_LENGTH_FIELD_SIZE
# define ASF_PPI_PADDING_LENGTH_FIELD_SIZE 0
#endif
#if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 1
#endif
#if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 2
#endif
#if (ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 4
#endif
#ifndef ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE
# define ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE 0
#endif
#if (ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 1
#endif
#if (ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 2
#endif
#if (ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 4
#endif
#ifndef ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE
# define ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE 0
#endif
#if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_BYTE == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 1
#endif
#if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_WORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 2
#endif
#if (ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_IS_DWORD == (ASF_PPI_PROPERTY_FLAGS & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 4
#endif
#ifndef ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE
# define ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE 0
#endif
#if (ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_BYTE == (ASF_PAYLOAD_FLAGS & ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_LENGTH_FIELD_SIZE 1
#endif
#if (ASF_PL_FLAG_PAYLOAD_LENGTH_FIELD_IS_WORD == (ASF_PAYLOAD_FLAGS & ASF_PL_MASK_PAYLOAD_LENGTH_FIELD_SIZE))
# define ASF_PAYLOAD_LENGTH_FIELD_SIZE 2
#endif
#ifndef ASF_PAYLOAD_LENGTH_FIELD_SIZE
# define ASF_PAYLOAD_LENGTH_FIELD_SIZE 0
#endif
#define PACKET_HEADER_MIN_SIZE \
(ASF_PACKET_ERROR_CORRECTION_FLAGS_FIELD_SIZE + \
ASF_PACKET_ERROR_CORRECTION_DATA_SIZE + \
1 + /* Length Type Flags */ \
1 + /* Property Flags */ \
ASF_PPI_PACKET_LENGTH_FIELD_SIZE + \
ASF_PPI_SEQUENCE_FIELD_SIZE + \
ASF_PPI_PADDING_LENGTH_FIELD_SIZE + \
4 + /* Send Time Field */ \
2) /* Duration Field */
// Replicated Data shall be at least 8 bytes long.
#define ASF_PAYLOAD_REPLICATED_DATA_LENGTH 0x08
#define PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD \
(1 + /* Stream Number */ \
ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE + \
ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE + \
ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE + \
ASF_PAYLOAD_REPLICATED_DATA_LENGTH)
#define PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS \
(1 + /* Stream Number */ \
ASF_PAYLOAD_MEDIA_OBJECT_NUMBER_FIELD_SIZE + \
ASF_PAYLOAD_OFFSET_INTO_MEDIA_OBJECT_FIELD_SIZE + \
ASF_PAYLOAD_REPLICATED_DATA_LENGTH_FIELD_SIZE + \
ASF_PAYLOAD_REPLICATED_DATA_LENGTH + \
ASF_PAYLOAD_LENGTH_FIELD_SIZE)
#define SINGLE_PAYLOAD_HEADERS \
(PACKET_HEADER_MIN_SIZE + \
PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD)
#define MULTI_PAYLOAD_HEADERS \
(PACKET_HEADER_MIN_SIZE + \
1 + /* Payload Flags */ \
2 * PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS)
#define DATA_HEADER_SIZE 50
#define PACKET_SIZE_MAX 65536
#define PACKET_SIZE_MIN 100
typedef struct ASFStream {
int num;
unsigned char seq;
uint16_t stream_language_index;
} ASFStream;
typedef struct ASFContext {
AVClass *av_class;
uint32_t seqno;
int is_streamed;
ASFStream streams[128]; ///< it's max number and it's not that big
const char *languages[128];
int nb_languages;
int64_t creation_time;
/* non-streamed additional info */
uint64_t nb_packets; ///< how many packets are there in the file, invalid if broadcasting
int64_t duration; ///< in 100ns units
/* packet filling */
unsigned char multi_payloads_present;
int packet_size_left;
int64_t packet_timestamp_start;
int64_t packet_timestamp_end;
unsigned int packet_nb_payloads;
uint8_t packet_buf[PACKET_SIZE_MAX];
FFIOContext pb;
/* only for reading */
uint64_t data_offset; ///< beginning of the first data packet
ASFIndex *index_ptr;
uint32_t nb_index_memory_alloc;
uint16_t maximum_packet;
uint32_t next_packet_number;
uint16_t next_packet_count;
uint64_t next_packet_offset;
int next_start_sec;
int end_sec;
int packet_size;
} ASFContext;
static const AVCodecTag codec_asf_bmp_tags[] = {
{ AV_CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
{ AV_CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
{ AV_CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
{ AV_CODEC_ID_NONE, 0 },
};
static const AVCodecTag *const asf_codec_tags[] = {
codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, NULL
};
#define PREROLL_TIME 3100
static void put_str16(AVIOContext *s, AVIOContext *dyn_buf, const char *tag)
{
uint8_t *buf;
int len;
avio_put_str16le(dyn_buf, tag);
len = avio_get_dyn_buf(dyn_buf, &buf);
avio_wl16(s, len);
avio_write(s, buf, len);
ffio_reset_dyn_buf(dyn_buf);
}
static int64_t put_header(AVIOContext *pb, const ff_asf_guid *g)
{
int64_t pos;
pos = avio_tell(pb);
ff_put_guid(pb, g);
avio_wl64(pb, 24);
return pos;
}
/* update header size */
static void end_header(AVIOContext *pb, int64_t pos)
{
int64_t pos1;
pos1 = avio_tell(pb);
avio_seek(pb, pos + 16, SEEK_SET);
avio_wl64(pb, pos1 - pos);
avio_seek(pb, pos1, SEEK_SET);
}
/* write an asf chunk (only used in streaming case) */
static void put_chunk(AVFormatContext *s, int type,
int payload_length, int flags)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int length;
length = payload_length + 8;
avio_wl16(pb, type);
avio_wl16(pb, length); // size
avio_wl32(pb, asf->seqno); // sequence number
avio_wl16(pb, flags); // unknown bytes
avio_wl16(pb, length); // size_confirm
asf->seqno++;
}
/* convert from av time to windows time */
static int64_t unix_to_file_time(int64_t ti)
{
int64_t t;
t = ti * INT64_C(10);
t += INT64_C(116444736000000000);
return t;
}
static int32_t get_send_time(ASFContext *asf, int64_t pres_time, uint64_t *offset)
{
int32_t send_time = 0;
*offset = asf->data_offset + DATA_HEADER_SIZE;
for (int i = 0; i < asf->next_start_sec; i++) {
if (pres_time <= asf->index_ptr[i].send_time)
break;
send_time = asf->index_ptr[i].send_time;
*offset = asf->index_ptr[i].offset;
}
return send_time / 10000;
}
static void asf_write_markers(AVFormatContext *s, AVIOContext *dyn_buf)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
AVRational scale = {1, 10000000};
int64_t hpos = put_header(pb, &ff_asf_marker_header);
ff_put_guid(pb, &ff_asf_reserved_4);// ASF spec mandates this reserved value
avio_wl32(pb, s->nb_chapters); // markers count
avio_wl16(pb, 0); // ASF spec mandates 0 for this
avio_wl16(pb, 0); // name length 0, no name given
for (unsigned i = 0; i < s->nb_chapters; i++) {
AVChapter *c = s->chapters[i];
AVDictionaryEntry *t = av_dict_get(c->metadata, "title", NULL, 0);
int64_t pres_time = av_rescale_q(c->start, c->time_base, scale);
uint64_t offset;
int32_t send_time = get_send_time(asf, pres_time, &offset);
int len = 0;
uint8_t *buf;
if (t) {
avio_put_str16le(dyn_buf, t->value);
len = avio_get_dyn_buf(dyn_buf, &buf);
}
avio_wl64(pb, offset); // offset of the packet with send_time
avio_wl64(pb, pres_time + PREROLL_TIME * 10000); // presentation time
avio_wl16(pb, 12 + len); // entry length
avio_wl32(pb, send_time); // send time
avio_wl32(pb, 0); // flags, should be 0
avio_wl32(pb, len / 2); // marker desc length in WCHARS!
if (t) {
avio_write(pb, buf, len); // marker desc
ffio_reset_dyn_buf(dyn_buf);
}
}
end_header(pb, hpos);
}
/* write the header (used two times if non streamed) */
static int asf_write_header1(AVFormatContext *s, int64_t file_size,
int64_t data_chunk_size)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb, *dyn_buf;
AVDictionaryEntry *tags[5];
int header_size, extra_size, extra_size2, wav_extra_size;
int has_title, has_aspect_ratio = 0;
int metadata_count;
int64_t header_offset, cur_pos, hpos;
int bit_rate, ret;
int64_t duration;
int audio_language_counts[128] = { 0 };
ff_metadata_conv(&s->metadata, ff_asf_metadata_conv, NULL);
tags[0] = av_dict_get(s->metadata, "title", NULL, 0);
tags[1] = av_dict_get(s->metadata, "author", NULL, 0);
tags[2] = av_dict_get(s->metadata, "copyright", NULL, 0);
tags[3] = av_dict_get(s->metadata, "comment", NULL, 0);
tags[4] = av_dict_get(s->metadata, "rating", NULL, 0);
duration = asf->duration + PREROLL_TIME * 10000;
has_title = tags[0] || tags[1] || tags[2] || tags[3] || tags[4];
if (!file_size) {
if (ff_parse_creation_time_metadata(s, &asf->creation_time, 0) != 0)
av_dict_set(&s->metadata, "creation_time", NULL, 0);
}
metadata_count = av_dict_count(s->metadata);
bit_rate = 0;
for (unsigned n = 0; n < s->nb_streams; n++) {
AVStream *const st = s->streams[n];
AVCodecParameters *const par = st->codecpar;
AVDictionaryEntry *entry;
avpriv_set_pts_info(s->streams[n], 32, 1, 1000); /* 32 bit pts in ms */
bit_rate += par->bit_rate;
if ( par->codec_type == AVMEDIA_TYPE_VIDEO
&& par->sample_aspect_ratio.num > 0
&& par->sample_aspect_ratio.den > 0)
has_aspect_ratio++;
entry = av_dict_get(s->streams[n]->metadata, "language", NULL, 0);
if (entry) {
const char *iso6391lang = ff_convert_lang_to(entry->value, AV_LANG_ISO639_1);
if (iso6391lang) {
int i;
for (i = 0; i < asf->nb_languages; i++) {
if (!strcmp(asf->languages[i], iso6391lang)) {
asf->streams[n].stream_language_index = i;
break;
}
}
if (i >= asf->nb_languages) {
asf->languages[asf->nb_languages] = iso6391lang;
asf->streams[n].stream_language_index = asf->nb_languages;
asf->nb_languages++;
}
if (par->codec_type == AVMEDIA_TYPE_AUDIO)
audio_language_counts[asf->streams[n].stream_language_index]++;
}
} else {
asf->streams[n].stream_language_index = 128;
}
}
if (asf->is_streamed) {
put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */
}
ff_put_guid(pb, &ff_asf_header);
avio_wl64(pb, -1); /* header length, will be patched after */
avio_wl32(pb, 3 + has_title + !!metadata_count + s->nb_streams); /* number of chunks in header */
avio_w8(pb, 1); /* ??? */
avio_w8(pb, 2); /* ??? */
/* file header */
header_offset = avio_tell(pb);
hpos = put_header(pb, &ff_asf_file_header);
ff_put_guid(pb, &ff_asf_my_guid);
avio_wl64(pb, file_size);
avio_wl64(pb, unix_to_file_time(asf->creation_time));
avio_wl64(pb, asf->nb_packets); /* number of packets */
avio_wl64(pb, duration); /* end time stamp (in 100ns units) */
avio_wl64(pb, asf->duration); /* duration (in 100ns units) */
avio_wl64(pb, PREROLL_TIME); /* start time stamp */
avio_wl32(pb, (asf->is_streamed || !(pb->seekable & AVIO_SEEKABLE_NORMAL)) ? 3 : 2); /* ??? */
avio_wl32(pb, s->packet_size); /* packet size */
avio_wl32(pb, s->packet_size); /* packet size */
avio_wl32(pb, bit_rate ? bit_rate : -1); /* Maximum data rate in bps */
end_header(pb, hpos);
/* header_extension */
hpos = put_header(pb, &ff_asf_head1_guid);
ff_put_guid(pb, &ff_asf_head2_guid);
avio_wl16(pb, 6);
avio_wl32(pb, 0); /* length, to be filled later */
if (asf->nb_languages) {
int64_t hpos2;
int nb_audio_languages = 0;
hpos2 = put_header(pb, &ff_asf_language_guid);
avio_wl16(pb, asf->nb_languages);
for (int i = 0; i < asf->nb_languages; i++) {
avio_w8(pb, 6);
avio_put_str16le(pb, asf->languages[i]);
}
end_header(pb, hpos2);
for (int i = 0; i < asf->nb_languages; i++)
if (audio_language_counts[i])
nb_audio_languages++;
if (nb_audio_languages > 1) {
hpos2 = put_header(pb, &ff_asf_group_mutual_exclusion_object);
ff_put_guid(pb, &ff_asf_mutex_language);
avio_wl16(pb, nb_audio_languages);
for (int i = 0; i < asf->nb_languages; i++) {
if (audio_language_counts[i]) {
avio_wl16(pb, audio_language_counts[i]);
for (unsigned n = 0; n < s->nb_streams; n++)
if (asf->streams[n].stream_language_index == i && s->streams[n]->codecpar->codec_type == AVMEDIA_TYPE_AUDIO)
avio_wl16(pb, n + 1);
}
}
end_header(pb, hpos2);
}
for (unsigned n = 0; n < s->nb_streams; n++) {
int64_t es_pos;
if (asf->streams[n].stream_language_index > 127)
continue;
es_pos = put_header(pb, &ff_asf_extended_stream_properties_object);
avio_wl64(pb, 0); /* start time */
avio_wl64(pb, 0); /* end time */
avio_wl32(pb, s->streams[n]->codecpar->bit_rate); /* data bitrate bps */
avio_wl32(pb, 5000); /* buffer size ms */
avio_wl32(pb, 0); /* initial buffer fullness */
avio_wl32(pb, s->streams[n]->codecpar->bit_rate); /* peak data bitrate */
avio_wl32(pb, 5000); /* maximum buffer size ms */
avio_wl32(pb, 0); /* max initial buffer fullness */
avio_wl32(pb, 0); /* max object size */
avio_wl32(pb, (!asf->is_streamed && (pb->seekable & AVIO_SEEKABLE_NORMAL)) << 1); /* flags - seekable */
avio_wl16(pb, n + 1); /* stream number */
avio_wl16(pb, asf->streams[n].stream_language_index); /* language id index */
avio_wl64(pb, 0); /* avg time per frame */
avio_wl16(pb, 0); /* stream name count */
avio_wl16(pb, 0); /* payload extension system count */
end_header(pb, es_pos);
}
}
if (has_aspect_ratio) {
int64_t hpos2;
hpos2 = put_header(pb, &ff_asf_metadata_header);
avio_wl16(pb, 2 * has_aspect_ratio);
for (unsigned n = 0; n < s->nb_streams; n++) {
AVCodecParameters *const par = s->streams[n]->codecpar;
if ( par->codec_type == AVMEDIA_TYPE_VIDEO
&& par->sample_aspect_ratio.num > 0
&& par->sample_aspect_ratio.den > 0) {
AVRational sar = par->sample_aspect_ratio;
avio_wl16(pb, 0);
// the stream number is set like this below
avio_wl16(pb, n + 1);
avio_wl16(pb, 26); // name_len
avio_wl16(pb, 3); // value_type
avio_wl32(pb, 4); // value_len
avio_put_str16le(pb, "AspectRatioX");
avio_wl32(pb, sar.num);
avio_wl16(pb, 0);
// the stream number is set like this below
avio_wl16(pb, n + 1);
avio_wl16(pb, 26); // name_len
avio_wl16(pb, 3); // value_type
avio_wl32(pb, 4); // value_len
avio_put_str16le(pb, "AspectRatioY");
avio_wl32(pb, sar.den);
}
}
end_header(pb, hpos2);
}
{
int64_t pos1;
pos1 = avio_tell(pb);
avio_seek(pb, hpos + 42, SEEK_SET);
avio_wl32(pb, pos1 - hpos - 46);
avio_seek(pb, pos1, SEEK_SET);
}
end_header(pb, hpos);
if ((ret = avio_open_dyn_buf(&dyn_buf)) < 0)
return ret;
/* title and other info */
if (has_title) {
uint8_t *buf;
int len;
hpos = put_header(pb, &ff_asf_comment_header);
for (size_t n = 0; n < FF_ARRAY_ELEMS(tags); n++) {
len = tags[n] ? avio_put_str16le(dyn_buf, tags[n]->value) : 0;
avio_wl16(pb, len);
}
len = avio_get_dyn_buf(dyn_buf, &buf);
avio_write(pb, buf, len);
ffio_reset_dyn_buf(dyn_buf);
end_header(pb, hpos);
}
if (metadata_count) {
const AVDictionaryEntry *tag = NULL;
hpos = put_header(pb, &ff_asf_extended_content_header);
avio_wl16(pb, metadata_count);
while ((tag = av_dict_iterate(s->metadata, tag))) {
put_str16(pb, dyn_buf, tag->key);
avio_wl16(pb, 0);
put_str16(pb, dyn_buf, tag->value);
}
end_header(pb, hpos);
}
/* chapters using ASF markers */
if (!asf->is_streamed && s->nb_chapters) {
asf_write_markers(s, dyn_buf);
}
/* stream headers */
for (unsigned n = 0; n < s->nb_streams; n++) {
AVCodecParameters *const par = s->streams[n]->codecpar;
int64_t es_pos;
// ASFStream *stream = &asf->streams[n];
asf->streams[n].num = n + 1;
asf->streams[n].seq = 1;
switch (par->codec_type) {
case AVMEDIA_TYPE_AUDIO:
wav_extra_size = 0;
extra_size = 18 + wav_extra_size;
extra_size2 = 8;
break;
default:
case AVMEDIA_TYPE_VIDEO:
wav_extra_size = par->extradata_size;
extra_size = 0x33 + wav_extra_size;
extra_size2 = 0;
break;
}
hpos = put_header(pb, &ff_asf_stream_header);
if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
ff_put_guid(pb, &ff_asf_audio_stream);
ff_put_guid(pb, &ff_asf_audio_conceal_spread);
} else {
ff_put_guid(pb, &ff_asf_video_stream);
ff_put_guid(pb, &ff_asf_video_conceal_none);
}
avio_wl64(pb, 0); /* ??? */
es_pos = avio_tell(pb);
avio_wl32(pb, extra_size); /* wav header len */
avio_wl32(pb, extra_size2); /* additional data len */
avio_wl16(pb, n + 1); /* stream number */
avio_wl32(pb, 0); /* ??? */
if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
/* WAVEFORMATEX header */
int wavsize = ff_put_wav_header(s, pb, par, FF_PUT_WAV_HEADER_FORCE_WAVEFORMATEX);
if (wavsize < 0) {
ret = wavsize;
goto fail;
}
if (wavsize != extra_size) {
cur_pos = avio_tell(pb);
avio_seek(pb, es_pos, SEEK_SET);
avio_wl32(pb, wavsize); /* wav header len */
avio_seek(pb, cur_pos, SEEK_SET);
}
/* ERROR Correction */
avio_w8(pb, 0x01);
if (par->codec_id == AV_CODEC_ID_ADPCM_G726 || !par->block_align) {
avio_wl16(pb, 0x0190);
avio_wl16(pb, 0x0190);
} else {
avio_wl16(pb, par->block_align);
avio_wl16(pb, par->block_align);
}
avio_wl16(pb, 0x01);
avio_w8(pb, 0x00);
} else {
avio_wl32(pb, par->width);
avio_wl32(pb, par->height);
avio_w8(pb, 2); /* ??? */
avio_wl16(pb, 40 + par->extradata_size); /* size */
/* BITMAPINFOHEADER header */
ff_put_bmp_header(pb, par, 1, 0, 0);
}
end_header(pb, hpos);
}
/* media comments */
hpos = put_header(pb, &ff_asf_codec_comment_header);
ff_put_guid(pb, &ff_asf_codec_comment1_header);
avio_wl32(pb, s->nb_streams);
for (unsigned n = 0; n < s->nb_streams; n++) {
AVCodecParameters *const par = s->streams[n]->codecpar;
const AVCodecDescriptor *const codec_desc = avcodec_descriptor_get(par->codec_id);
const char *desc;
if (par->codec_type == AVMEDIA_TYPE_AUDIO)
avio_wl16(pb, 2);
else if (par->codec_type == AVMEDIA_TYPE_VIDEO)
avio_wl16(pb, 1);
else
avio_wl16(pb, -1);
if (par->codec_id == AV_CODEC_ID_WMAV2)
desc = "Windows Media Audio V8";
else
desc = codec_desc ? codec_desc->name : NULL;
if (desc) {
uint8_t *buf;
int len;
avio_put_str16le(dyn_buf, desc);
len = avio_get_dyn_buf(dyn_buf, &buf);
avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
avio_write(pb, buf, len);
ffio_reset_dyn_buf(dyn_buf);
} else
avio_wl16(pb, 0);
avio_wl16(pb, 0); /* no parameters */
/* id */
if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
avio_wl16(pb, 2);
avio_wl16(pb, par->codec_tag);
} else {
avio_wl16(pb, 4);
avio_wl32(pb, par->codec_tag);
}
if (!par->codec_tag) {
ret = AVERROR(EINVAL);
goto fail;
}
}
end_header(pb, hpos);
/* patch the header size fields */
cur_pos = avio_tell(pb);
header_size = cur_pos - header_offset;
if (asf->is_streamed) {
header_size += 8 + 30 + DATA_HEADER_SIZE;
avio_seek(pb, header_offset - 10 - 30, SEEK_SET);
avio_wl16(pb, header_size);
avio_seek(pb, header_offset - 2 - 30, SEEK_SET);
avio_wl16(pb, header_size);
header_size -= 8 + 30 + DATA_HEADER_SIZE;
}
header_size += 24 + 6;
avio_seek(pb, header_offset - 14, SEEK_SET);
avio_wl64(pb, header_size);
avio_seek(pb, cur_pos, SEEK_SET);
/* movie chunk, followed by packets of packet_size */
asf->data_offset = cur_pos;
ff_put_guid(pb, &ff_asf_data_header);
avio_wl64(pb, data_chunk_size);
ff_put_guid(pb, &ff_asf_my_guid);
avio_wl64(pb, asf->nb_packets); /* nb packets */
avio_w8(pb, 1); /* ??? */
avio_w8(pb, 1); /* ??? */
ret = 0;
fail:
ffio_free_dyn_buf(&dyn_buf);
return ret;
}
static int asf_write_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
int ret;
s->packet_size = asf->packet_size;
s->max_interleave_delta = 0;
asf->nb_packets = 0;
if (s->nb_streams > 127) {
av_log(s, AV_LOG_ERROR, "ASF can only handle 127 streams\n");
return AVERROR(EINVAL);
}
asf->index_ptr = av_malloc(sizeof(ASFIndex) * ASF_INDEX_BLOCK);
if (!asf->index_ptr)
return AVERROR(ENOMEM);
asf->nb_index_memory_alloc = ASF_INDEX_BLOCK;
asf->maximum_packet = 0;
/* the data-chunk-size has to be 50 (DATA_HEADER_SIZE), which is
* data_size - asf->data_offset at the moment this function is done.
* It is needed to use asf as a streamable format. */
if ((ret = asf_write_header1(s, 0, DATA_HEADER_SIZE)) < 0)
return ret;
asf->packet_nb_payloads = 0;
asf->packet_timestamp_start = -1;
asf->packet_timestamp_end = -1;
ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
NULL, NULL, NULL, NULL);
if (s->avoid_negative_ts < 0)
s->avoid_negative_ts = 1;
return 0;
}
static int asf_write_stream_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
asf->is_streamed = 1;
return asf_write_header(s);
}
static int put_payload_parsing_info(AVFormatContext *s,
unsigned sendtime, unsigned duration,
int nb_payloads, int padsize)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int ppi_size;
int64_t start = avio_tell(pb);
int iLengthTypeFlags = ASF_PPI_LENGTH_TYPE_FLAGS;
padsize -= PACKET_HEADER_MIN_SIZE;
if (asf->multi_payloads_present)
padsize--;
av_assert0(padsize >= 0);
avio_w8(pb, ASF_PACKET_ERROR_CORRECTION_FLAGS);
ffio_fill(pb, 0x0, ASF_PACKET_ERROR_CORRECTION_DATA_SIZE);
if (asf->multi_payloads_present)
iLengthTypeFlags |= ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT;
if (padsize > 0) {
if (padsize < 256)
iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE;
else
iLengthTypeFlags |= ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD;
}
avio_w8(pb, iLengthTypeFlags);
avio_w8(pb, ASF_PPI_PROPERTY_FLAGS);
if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_WORD)
avio_wl16(pb, padsize - 2);
if (iLengthTypeFlags & ASF_PPI_FLAG_PADDING_LENGTH_FIELD_IS_BYTE)
avio_w8(pb, padsize - 1);
avio_wl32(pb, sendtime);
avio_wl16(pb, duration);
if (asf->multi_payloads_present)
avio_w8(pb, nb_payloads | ASF_PAYLOAD_FLAGS);
ppi_size = avio_tell(pb) - start;
return ppi_size;
}
static void flush_packet(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
int packet_hdr_size, packet_filled_size;
av_assert0(asf->packet_timestamp_end >= asf->packet_timestamp_start);
if (asf->is_streamed)
put_chunk(s, 0x4424, s->packet_size, 0);
packet_hdr_size = put_payload_parsing_info(s,
asf->packet_timestamp_start,
asf->packet_timestamp_end - asf->packet_timestamp_start,
asf->packet_nb_payloads,
asf->packet_size_left);
packet_filled_size = asf->packet_size - asf->packet_size_left;
av_assert0(packet_hdr_size <= asf->packet_size_left);
memset(asf->packet_buf + packet_filled_size, 0, asf->packet_size_left);
avio_write(s->pb, asf->packet_buf, s->packet_size - packet_hdr_size);
avio_write_marker(s->pb, AV_NOPTS_VALUE, AVIO_DATA_MARKER_FLUSH_POINT);
asf->nb_packets++;
asf->packet_nb_payloads = 0;
asf->packet_timestamp_start = -1;
asf->packet_timestamp_end = -1;
ffio_init_context(&asf->pb, asf->packet_buf, s->packet_size, 1,
NULL, NULL, NULL, NULL);
}
static void put_payload_header(AVFormatContext *s, ASFStream *stream,
int64_t presentation_time, int m_obj_size,
int m_obj_offset, int payload_len, int flags)
{
ASFContext *asf = s->priv_data;
AVIOContext *const pb = &asf->pb.pub;
int val;
val = stream->num;
if (flags & AV_PKT_FLAG_KEY)
val |= ASF_PL_FLAG_KEY_FRAME;
avio_w8(pb, val);
avio_w8(pb, stream->seq); // Media object number
avio_wl32(pb, m_obj_offset); // Offset Into Media Object
// Replicated Data shall be at least 8 bytes long.
// The first 4 bytes of data shall contain the
// Size of the Media Object that the payload belongs to.
// The next 4 bytes of data shall contain the
// Presentation Time for the media object that the payload belongs to.
avio_w8(pb, ASF_PAYLOAD_REPLICATED_DATA_LENGTH);
avio_wl32(pb, m_obj_size); // Replicated Data - Media Object Size
avio_wl32(pb, (uint32_t) presentation_time); // Replicated Data - Presentation Time
if (asf->multi_payloads_present) {
avio_wl16(pb, payload_len); // payload length
}
}
static void put_frame(AVFormatContext *s, ASFStream *stream, AVStream *avst,
int64_t timestamp, const uint8_t *buf,
int m_obj_size, int flags)
{
ASFContext *asf = s->priv_data;
int m_obj_offset, payload_len, frag_len1;
m_obj_offset = 0;
while (m_obj_offset < m_obj_size) {
payload_len = m_obj_size - m_obj_offset;
if (asf->packet_timestamp_start == -1) {
const int multi_payload_constant = (asf->packet_size - MULTI_PAYLOAD_HEADERS);
asf->multi_payloads_present = (payload_len < multi_payload_constant);
asf->packet_size_left = asf->packet_size;
if (asf->multi_payloads_present) {
frag_len1 = multi_payload_constant - 1;
} else {
frag_len1 = asf->packet_size - SINGLE_PAYLOAD_HEADERS;
}
asf->packet_timestamp_start = timestamp;
} else {
// multi payloads
frag_len1 = asf->packet_size_left -
PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS -
PACKET_HEADER_MIN_SIZE - 1;
if (frag_len1 < payload_len &&
avst->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
flush_packet(s);
continue;
}
if (asf->packet_timestamp_start > INT64_MAX - UINT16_MAX ||
timestamp > asf->packet_timestamp_start + UINT16_MAX) {
flush_packet(s);
continue;
}
}
if (frag_len1 > 0) {
if (payload_len > frag_len1)
payload_len = frag_len1;
else if (payload_len == (frag_len1 - 1))
payload_len = frag_len1 - 2; // additional byte need to put padding length
put_payload_header(s, stream, timestamp + PREROLL_TIME,
m_obj_size, m_obj_offset, payload_len, flags);
avio_write(&asf->pb.pub, buf, payload_len);
if (asf->multi_payloads_present)
asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS);
else
asf->packet_size_left -= (payload_len + PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD);
asf->packet_timestamp_end = timestamp;
asf->packet_nb_payloads++;
} else {
payload_len = 0;
}
m_obj_offset += payload_len;
buf += payload_len;
if (!asf->multi_payloads_present)
flush_packet(s);
else if (asf->packet_size_left <= (PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS + PACKET_HEADER_MIN_SIZE + 1))
flush_packet(s);
else if (asf->packet_nb_payloads == ASF_PAYLOADS_PER_PACKET)
flush_packet(s);
}
stream->seq++;
}
static int update_index(AVFormatContext *s, int start_sec,
uint32_t packet_number, uint16_t packet_count,
uint64_t packet_offset)
{
ASFContext *asf = s->priv_data;
if (start_sec > asf->next_start_sec) {
if (!asf->next_start_sec) {
asf->next_packet_number = packet_number;
asf->next_packet_count = packet_count;
asf->next_packet_offset = packet_offset;
}
if (start_sec > asf->nb_index_memory_alloc) {
int err;
asf->nb_index_memory_alloc = (start_sec + ASF_INDEX_BLOCK) & ~(ASF_INDEX_BLOCK - 1);
if ((err = av_reallocp_array(&asf->index_ptr,
asf->nb_index_memory_alloc,
sizeof(*asf->index_ptr))) < 0) {
asf->nb_index_memory_alloc = 0;
return err;
}
}
for (int i = asf->next_start_sec; i < start_sec; i++) {
asf->index_ptr[i].packet_number = asf->next_packet_number;
asf->index_ptr[i].packet_count = asf->next_packet_count;
asf->index_ptr[i].send_time = asf->next_start_sec * INT64_C(10000000);
asf->index_ptr[i].offset = asf->next_packet_offset;
}
}
asf->maximum_packet = FFMAX(asf->maximum_packet, packet_count);
asf->next_packet_number = packet_number;
asf->next_packet_count = packet_count;
asf->next_packet_offset = packet_offset;
asf->next_start_sec = start_sec;
return 0;
}
static int asf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
ASFStream *stream;
AVCodecParameters *par;
uint32_t packet_number;
int64_t pts;
int start_sec;
int flags = pkt->flags;
int ret;
uint64_t offset = avio_tell(pb);
par = s->streams[pkt->stream_index]->codecpar;
stream = &asf->streams[pkt->stream_index];
if (par->codec_type == AVMEDIA_TYPE_AUDIO)
flags &= ~AV_PKT_FLAG_KEY;
pts = (pkt->pts != AV_NOPTS_VALUE) ? pkt->pts : pkt->dts;
av_assert0(pts != AV_NOPTS_VALUE);
if ( pts < - PREROLL_TIME
|| pts > (INT_MAX-3)/10000LL * ASF_INDEXED_INTERVAL - PREROLL_TIME) {
av_log(s, AV_LOG_ERROR, "input pts %"PRId64" is invalid\n", pts);
return AVERROR(EINVAL);
}
pts *= 10000;
asf->duration = FFMAX(asf->duration, pts + pkt->duration * 10000);
packet_number = asf->nb_packets;
put_frame(s, stream, s->streams[pkt->stream_index],
pkt->dts, pkt->data, pkt->size, flags);
start_sec = (int)((PREROLL_TIME * 10000 + pts + ASF_INDEXED_INTERVAL - 1)
/ ASF_INDEXED_INTERVAL);
/* check index */
if ((!asf->is_streamed) && (flags & AV_PKT_FLAG_KEY)) {
uint16_t packet_count = asf->nb_packets - packet_number;
ret = update_index(s, start_sec, packet_number, packet_count, offset);
if (ret < 0)
return ret;
}
asf->end_sec = start_sec;
return 0;
}
static int asf_write_index(AVFormatContext *s, const ASFIndex *index,
uint16_t max, uint32_t count)
{
AVIOContext *pb = s->pb;
ff_put_guid(pb, &ff_asf_simple_index_header);
avio_wl64(pb, 24 + 16 + 8 + 4 + 4 + (4 + 2) * count);
ff_put_guid(pb, &ff_asf_my_guid);
avio_wl64(pb, ASF_INDEXED_INTERVAL);
avio_wl32(pb, max);
avio_wl32(pb, count);
for (uint32_t i = 0; i < count; i++) {
avio_wl32(pb, index[i].packet_number);
avio_wl16(pb, index[i].packet_count);
}
return 0;
}
static int asf_write_trailer(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
int64_t file_size, data_size;
int ret;
/* flush the current packet */
if (asf->pb.pub.buf_ptr > asf->pb.pub.buffer)
flush_packet(s);
/* write index */
data_size = avio_tell(s->pb);
if (!asf->is_streamed && asf->next_start_sec) {
if ((ret = update_index(s, asf->end_sec + 1, 0, 0, 0)) < 0)
return ret;
asf_write_index(s, asf->index_ptr, asf->maximum_packet, asf->next_start_sec);
}
if (asf->is_streamed || !(s->pb->seekable & AVIO_SEEKABLE_NORMAL)) {
put_chunk(s, 0x4524, 0, 0); /* end of stream */
} else {
/* rewrite an updated header */
file_size = avio_tell(s->pb);
avio_seek(s->pb, 0, SEEK_SET);
asf_write_header1(s, file_size, data_size - asf->data_offset);
}
return 0;
}
static void asf_deinit(AVFormatContext *s)
{
ASFContext *const asf = s->priv_data;
av_freep(&asf->index_ptr);
}
static const AVOption asf_options[] = {
{ "packet_size", "Packet size", offsetof(ASFContext, packet_size), AV_OPT_TYPE_INT, {.i64 = 3200}, PACKET_SIZE_MIN, PACKET_SIZE_MAX, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};
static const AVClass asf_muxer_class = {
.class_name = "ASF (stream) muxer",
.item_name = av_default_item_name,
.option = asf_options,
.version = LIBAVUTIL_VERSION_INT,
};
#if CONFIG_ASF_MUXER
const AVOutputFormat ff_asf_muxer = {
.name = "asf",
.long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
.mime_type = "video/x-ms-asf",
.extensions = "asf,wmv,wma",
.priv_data_size = sizeof(ASFContext),
.audio_codec = AV_CODEC_ID_WMAV2,
.video_codec = AV_CODEC_ID_MSMPEG4V3,
.write_header = asf_write_header,
.write_packet = asf_write_packet,
.write_trailer = asf_write_trailer,
.flags = AVFMT_GLOBALHEADER,
.codec_tag = asf_codec_tags,
.priv_class = &asf_muxer_class,
.deinit = asf_deinit,
};
#endif /* CONFIG_ASF_MUXER */
#if CONFIG_ASF_STREAM_MUXER
const AVOutputFormat ff_asf_stream_muxer = {
.name = "asf_stream",
.long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
.mime_type = "video/x-ms-asf",
.extensions = "asf,wmv,wma",
.priv_data_size = sizeof(ASFContext),
.audio_codec = AV_CODEC_ID_WMAV2,
.video_codec = AV_CODEC_ID_MSMPEG4V3,
.write_header = asf_write_stream_header,
.write_packet = asf_write_packet,
.write_trailer = asf_write_trailer,
.flags = AVFMT_GLOBALHEADER,
.codec_tag = asf_codec_tags,
.priv_class = &asf_muxer_class,
.deinit = asf_deinit,
};
#endif /* CONFIG_ASF_STREAM_MUXER */