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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 "avformat.h"
#include "internal.h"
#include "riff.h"
#include "asf.h"
#include "avio_internal.h"
#include "libavutil/dict.h"
#undef NDEBUG
#include <assert.h>
#define ASF_INDEXED_INTERVAL 10000000
#define ASF_INDEX_BLOCK (1<<9)
#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_DATA_LENGTH (\
PACKET_SIZE - \
PACKET_HEADER_MIN_SIZE - \
PAYLOAD_HEADER_SIZE_SINGLE_PAYLOAD \
)
#define MULTI_PAYLOAD_CONSTANT (\
PACKET_SIZE - \
PACKET_HEADER_MIN_SIZE - \
1 - /*Payload Flags*/ \
2*PAYLOAD_HEADER_SIZE_MULTIPLE_PAYLOADS \
)
typedef struct {
uint32_t seqno;
int is_streamed;
ASFStream streams[128]; ///< it's max number and it's not that big
/* non streamed additonnal 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];
AVIOContext 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;
int next_start_sec;
int end_sec;
} 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 },
};
#define PREROLL_TIME 3100
void ff_put_guid(AVIOContext *s, const ff_asf_guid *g)
{
assert(sizeof(*g) == 16);
avio_write(s, *g, sizeof(*g));
}
static void put_str16(AVIOContext *s, const char *tag)
{
int len;
uint8_t *pb;
AVIOContext *dyn_buf;
if (avio_open_dyn_buf(&dyn_buf) < 0)
return;
avio_put_str16le(dyn_buf, tag);
len = avio_close_dyn_buf(dyn_buf, &pb);
avio_wl16(s, len);
avio_write(s, pb, len);
av_freep(&pb);
}
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 unix to windows time */
static int64_t unix_to_file_time(int ti)
{
int64_t t;
t = ti * INT64_C(10000000);
t += INT64_C(116444736000000000);
return t;
}
/* 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;
AVDictionaryEntry *tags[5];
int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;
int has_title;
int metadata_count;
AVCodecContext *enc;
int64_t header_offset, cur_pos, hpos;
int bit_rate;
int64_t duration;
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];
metadata_count = av_dict_count(s->metadata);
bit_rate = 0;
for(n=0;n<s->nb_streams;n++) {
enc = s->streams[n]->codec;
avpriv_set_pts_info(s->streams[n], 32, 1, 1000); /* 32 bit pts in ms */
bit_rate += enc->bit_rate;
}
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);
file_time = 0;
avio_wl64(pb, unix_to_file_time(file_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 ) ? 3 : 2); /* ??? */
avio_wl32(pb, s->packet_size); /* packet size */
avio_wl32(pb, s->packet_size); /* packet size */
avio_wl32(pb, bit_rate); /* Nominal data rate in bps */
end_header(pb, hpos);
/* unknown headers */
hpos = put_header(pb, &ff_asf_head1_guid);
ff_put_guid(pb, &ff_asf_head2_guid);
avio_wl32(pb, 6);
avio_wl16(pb, 0);
end_header(pb, hpos);
/* title and other infos */
if (has_title) {
int len;
uint8_t *buf;
AVIOContext *dyn_buf;
if (avio_open_dyn_buf(&dyn_buf) < 0)
return AVERROR(ENOMEM);
hpos = put_header(pb, &ff_asf_comment_header);
for (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_close_dyn_buf(dyn_buf, &buf);
avio_write(pb, buf, len);
av_freep(&buf);
end_header(pb, hpos);
}
if (metadata_count) {
AVDictionaryEntry *tag = NULL;
hpos = put_header(pb, &ff_asf_extended_content_header);
avio_wl16(pb, metadata_count);
while ((tag = av_dict_get(s->metadata, "", tag, AV_DICT_IGNORE_SUFFIX))) {
put_str16(pb, tag->key);
avio_wl16(pb, 0);
put_str16(pb, tag->value);
}
end_header(pb, hpos);
}
/* stream headers */
for(n=0;n<s->nb_streams;n++) {
int64_t es_pos;
// ASFStream *stream = &asf->streams[n];
enc = s->streams[n]->codec;
asf->streams[n].num = n + 1;
asf->streams[n].seq = 1;
switch(enc->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 = enc->extradata_size;
extra_size = 0x33 + wav_extra_size;
extra_size2 = 0;
break;
}
hpos = put_header(pb, &ff_asf_stream_header);
if (enc->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 (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
/* WAVEFORMATEX header */
int wavsize = ff_put_wav_header(pb, enc);
if (wavsize < 0)
return -1;
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(enc->codec_id == AV_CODEC_ID_ADPCM_G726 || !enc->block_align){
avio_wl16(pb, 0x0190);
avio_wl16(pb, 0x0190);
}else{
avio_wl16(pb, enc->block_align);
avio_wl16(pb, enc->block_align);
}
avio_wl16(pb, 0x01);
avio_w8(pb, 0x00);
} else {
avio_wl32(pb, enc->width);
avio_wl32(pb, enc->height);
avio_w8(pb, 2); /* ??? */
avio_wl16(pb, 40 + enc->extradata_size); /* size */
/* BITMAPINFOHEADER header */
ff_put_bmp_header(pb, enc, ff_codec_bmp_tags, 1);
}
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(n=0;n<s->nb_streams;n++) {
AVCodec *p;
const char *desc;
int len;
uint8_t *buf;
AVIOContext *dyn_buf;
enc = s->streams[n]->codec;
p = avcodec_find_encoder(enc->codec_id);
if(enc->codec_type == AVMEDIA_TYPE_AUDIO)
avio_wl16(pb, 2);
else if(enc->codec_type == AVMEDIA_TYPE_VIDEO)
avio_wl16(pb, 1);
else
avio_wl16(pb, -1);
if(enc->codec_id == AV_CODEC_ID_WMAV2)
desc = "Windows Media Audio V8";
else
desc = p ? p->name : enc->codec_name;
if ( avio_open_dyn_buf(&dyn_buf) < 0)
return AVERROR(ENOMEM);
avio_put_str16le(dyn_buf, desc);
len = avio_close_dyn_buf(dyn_buf, &buf);
avio_wl16(pb, len / 2); // "number of characters" = length in bytes / 2
avio_write(pb, buf, len);
av_freep(&buf);
avio_wl16(pb, 0); /* no parameters */
/* id */
if (enc->codec_type == AVMEDIA_TYPE_AUDIO) {
avio_wl16(pb, 2);
avio_wl16(pb, enc->codec_tag);
} else {
avio_wl16(pb, 4);
avio_wl32(pb, enc->codec_tag);
}
if(!enc->codec_tag)
return -1;
}
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 + 50;
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 + 50;
}
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); /* ??? */
return 0;
}
static int asf_write_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
s->packet_size = PACKET_SIZE;
asf->nb_packets = 0;
asf->index_ptr = av_malloc( sizeof(ASFIndex) * ASF_INDEX_BLOCK );
asf->nb_index_memory_alloc = ASF_INDEX_BLOCK;
asf->maximum_packet = 0;
/* the data-chunk-size has to be 50, which is data_size - asf->data_offset
* at the moment this function is done. It is needed to use asf as
* streamable format. */
if (asf_write_header1(s, 0, 50) < 0) {
//av_free(asf);
return -1;
}
avio_flush(s->pb);
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);
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 int sendtime,
unsigned int duration,
int nb_payloads,
int padsize
)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int ppi_size, i;
int64_t start= avio_tell(pb);
int iLengthTypeFlags = ASF_PPI_LENGTH_TYPE_FLAGS;
padsize -= PACKET_HEADER_MIN_SIZE;
if(asf->multi_payloads_present)
padsize--;
assert(padsize>=0);
avio_w8(pb, ASF_PACKET_ERROR_CORRECTION_FLAGS);
for (i = 0; i < ASF_PACKET_ERROR_CORRECTION_DATA_SIZE; i++){
avio_w8(pb, 0x0);
}
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;
assert(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 = PACKET_SIZE - asf->packet_size_left;
assert(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_flush(s->pb);
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 *pb = &asf->pb;
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) {
asf->multi_payloads_present = (payload_len < MULTI_PAYLOAD_CONSTANT);
asf->packet_size_left = PACKET_SIZE;
if (asf->multi_payloads_present){
frag_len1 = MULTI_PAYLOAD_CONSTANT - 1;
}
else {
frag_len1 = SINGLE_PAYLOAD_DATA_LENGTH;
}
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->codec->codec_type == AVMEDIA_TYPE_AUDIO){
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, 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);
}
stream->seq++;
}
static void update_index(AVFormatContext *s, int start_sec,
uint32_t packet_number, uint16_t packet_count)
{
ASFContext *asf = s->priv_data;
if (start_sec > asf->next_start_sec) {
int i;
if (!asf->next_start_sec) {
asf->next_packet_number = packet_number;
asf->next_packet_count = packet_count;
}
if (start_sec > asf->nb_index_memory_alloc) {
asf->nb_index_memory_alloc = (start_sec + ASF_INDEX_BLOCK) & ~(ASF_INDEX_BLOCK - 1);
asf->index_ptr = av_realloc( asf->index_ptr, sizeof(ASFIndex) * asf->nb_index_memory_alloc );
}
for (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->maximum_packet = FFMAX(asf->maximum_packet, packet_count);
asf->next_packet_number = packet_number;
asf->next_packet_count = packet_count;
asf->next_start_sec = start_sec;
}
static int asf_write_packet(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
ASFStream *stream;
AVCodecContext *codec;
uint32_t packet_number;
int64_t pts;
int start_sec;
int flags= pkt->flags;
codec = s->streams[pkt->stream_index]->codec;
stream = &asf->streams[pkt->stream_index];
if(codec->codec_type == AVMEDIA_TYPE_AUDIO)
flags &= ~AV_PKT_FLAG_KEY;
pts = (pkt->pts != AV_NOPTS_VALUE) ? pkt->pts : pkt->dts;
assert(pts != AV_NOPTS_VALUE);
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;
update_index(s, start_sec, packet_number, packet_count);
}
asf->end_sec = start_sec;
return 0;
}
//
static int asf_write_index(AVFormatContext *s, ASFIndex *index, uint16_t max, uint32_t count)
{
AVIOContext *pb = s->pb;
int i;
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(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;
/* flush the current packet */
if (asf->pb.buf_ptr > asf->pb.buffer)
flush_packet(s);
/* write index */
data_size = avio_tell(s->pb);
if (!asf->is_streamed && asf->next_start_sec) {
update_index(s, asf->end_sec + 1, 0, 0);
asf_write_index(s, asf->index_ptr, asf->maximum_packet, asf->next_start_sec);
}
avio_flush(s->pb);
if (asf->is_streamed || !s->pb->seekable) {
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);
}
avio_flush(s->pb);
av_free(asf->index_ptr);
return 0;
}
#if CONFIG_ASF_MUXER
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 = (const AVCodecTag* const []){
codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0
},
};
#endif
#if CONFIG_ASF_STREAM_MUXER
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 = (const AVCodecTag* const []){
codec_asf_bmp_tags, ff_codec_bmp_tags, ff_codec_wav_tags, 0
},
};
#endif //CONFIG_ASF_STREAM_MUXER
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