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ffmpeg/libav/asf.c
Philip Gladstone f80c1ac01b * Many, many changes to make it work (mostly). Information snagged from 
staring at headers of real ASF files. ASFRecorder and avifile were
  other useful sources.

Originally committed as revision 457 to svn://svn.ffmpeg.org/ffmpeg/trunk
2002-05-09 01:13:43 +00:00

1037 lines
30 KiB
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/*
* ASF compatible encoder and decoder.
* Copyright (c) 2000, 2001 Gerard Lantau.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "avformat.h"
#include "avi.h"
#include "tick.h"
#include "mpegaudio.h"
#define PACKET_SIZE 3200
#define PACKET_HEADER_SIZE 12
#define FRAME_HEADER_SIZE 17
typedef struct {
int num;
int seq;
Ticker pts_ticker;
/* use for reading */
AVPacket pkt;
int frag_offset;
INT64 duration;
} ASFStream;
typedef struct {
int seqno;
int packet_size;
ASFStream streams[2];
/* non streamed additonnal info */
int data_offset;
INT64 nb_packets;
INT64 duration; /* in 100ns units */
/* packet filling */
int packet_size_left;
int packet_timestamp_start;
int packet_timestamp_end;
int packet_nb_frames;
UINT8 packet_buf[PACKET_SIZE];
ByteIOContext pb;
/* only for reading */
int packet_padsize;
} ASFContext;
typedef struct {
UINT32 v1;
UINT16 v2;
UINT16 v3;
UINT8 v4[8];
} GUID;
static const GUID asf_header = {
0x75B22630, 0x668E, 0x11CF, { 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C },
};
static const GUID file_header = {
0x8CABDCA1, 0xA947, 0x11CF, { 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },
};
static const GUID stream_header = {
0xB7DC0791, 0xA9B7, 0x11CF, { 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 },
};
static const GUID audio_stream = {
0xF8699E40, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
};
static const GUID audio_conceal_none = {
// 0x49f1a440, 0x4ece, 0x11d0, { 0xa3, 0xac, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },
// New value lifted from avifile
0x20fb5700, 0x5b55, 0x11cf, { 0xa8, 0xfd, 0x00, 0x80, 0x5f, 0x5c, 0x44, 0x2b },
};
static const GUID video_stream = {
0xBC19EFC0, 0x5B4D, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
};
static const GUID video_conceal_none = {
0x20FB5700, 0x5B55, 0x11CF, { 0xA8, 0xFD, 0x00, 0x80, 0x5F, 0x5C, 0x44, 0x2B },
};
static const GUID comment_header = {
0x75b22633, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },
};
static const GUID codec_comment_header = {
0x86D15240, 0x311D, 0x11D0, { 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 },
};
static const GUID codec_comment1_header = {
0x86d15241, 0x311d, 0x11d0, { 0xa3, 0xa4, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6 },
};
static const GUID data_header = {
0x75b22636, 0x668e, 0x11cf, { 0xa6, 0xd9, 0x00, 0xaa, 0x00, 0x62, 0xce, 0x6c },
};
static const GUID index_guid = {
0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
};
static const GUID head1_guid = {
0x5fbf03b5, 0xa92e, 0x11cf, { 0x8e, 0xe3, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },
};
static const GUID head2_guid = {
0xabd3d211, 0xa9ba, 0x11cf, { 0x8e, 0xe6, 0x00, 0xc0, 0x0c, 0x20, 0x53, 0x65 },
};
/* I am not a number !!! This GUID is the one found on the PC used to
generate the stream */
static const GUID my_guid = {
0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 },
};
CodecTag codec_asf_bmp_tags[] = {
{ CODEC_ID_H263, MKTAG('H', '2', '6', '3') },
{ CODEC_ID_H263P, MKTAG('H', '2', '6', '3') },
{ CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* intel h263 */
{ CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
{ CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') },
{ CODEC_ID_MPEG4, MKTAG('d', 'i', 'v', 'x') },
{ CODEC_ID_MPEG4, MKTAG(0x04, 0, 0, 0) }, /* some broken avi use this */
{ CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') }, /* default signature when using MSMPEG4 */
{ CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3') },
{ CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') },
{ CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', '4', '1') },
{ 0, 0 },
};
static void put_guid(ByteIOContext *s, const GUID *g)
{
int i;
put_le32(s, g->v1);
put_le16(s, g->v2);
put_le16(s, g->v3);
for(i=0;i<8;i++)
put_byte(s, g->v4[i]);
}
static void put_str16(ByteIOContext *s, const char *tag)
{
int c;
put_le16(s,strlen(tag) + 1);
for(;;) {
c = (UINT8)*tag++;
put_le16(s, c);
if (c == '\0')
break;
}
}
static void put_str16_nolen(ByteIOContext *s, const char *tag)
{
int c;
for(;;) {
c = (UINT8)*tag++;
put_le16(s, c);
if (c == '\0')
break;
}
}
static INT64 put_header(ByteIOContext *pb, const GUID *g)
{
INT64 pos;
pos = url_ftell(pb);
put_guid(pb, g);
put_le64(pb, 24);
return pos;
}
/* update header size */
static void end_header(ByteIOContext *pb, INT64 pos)
{
INT64 pos1;
pos1 = url_ftell(pb);
url_fseek(pb, pos + 16, SEEK_SET);
put_le64(pb, pos1 - pos);
url_fseek(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;
ByteIOContext *pb = &s->pb;
int length;
length = payload_length + 8;
put_le16(pb, type);
put_le16(pb, length);
put_le32(pb, asf->seqno);
put_le16(pb, flags); /* unknown bytes */
put_le16(pb, length);
asf->seqno++;
}
/* convert from unix to windows time */
static INT64 unix_to_file_time(int ti)
{
INT64 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 file_size, INT64 data_chunk_size)
{
ASFContext *asf = s->priv_data;
ByteIOContext *pb = &s->pb;
int header_size, n, extra_size, extra_size2, wav_extra_size, file_time;
int has_title;
AVCodecContext *enc;
INT64 header_offset, cur_pos, hpos;
int bit_rate;
has_title = (s->title[0] != '\0');
bit_rate = 0;
for(n=0;n<s->nb_streams;n++) {
enc = &s->streams[n]->codec;
bit_rate += enc->bit_rate;
}
if (url_is_streamed(&s->pb)) {
put_chunk(s, 0x4824, 0, 0xc00); /* start of stream (length will be patched later) */
}
put_guid(pb, &asf_header);
put_le64(pb, 0); /* header length, will be patched after */
put_le32(pb, 3 + has_title + s->nb_streams); /* number of chunks in header */
put_byte(pb, 1); /* ??? */
put_byte(pb, 2); /* ??? */
/* file header */
header_offset = url_ftell(pb);
hpos = put_header(pb, &file_header);
put_guid(pb, &my_guid);
put_le64(pb, file_size);
file_time = 0;
put_le64(pb, unix_to_file_time(file_time));
put_le64(pb, asf->nb_packets); /* number of packets */
put_le64(pb, asf->duration); /* end time stamp (in 100ns units) */
put_le64(pb, asf->duration); /* duration (in 100ns units) */
put_le32(pb, 0); /* start time stamp */
put_le32(pb, 0); /* ??? */
put_le32(pb, url_is_streamed(&s->pb) ? 1 : 0); /* ??? */
put_le32(pb, asf->packet_size); /* packet size */
put_le32(pb, asf->packet_size); /* packet size */
put_le32(pb, bit_rate); /* Nominal data rate in bps */
end_header(pb, hpos);
/* unknown headers */
hpos = put_header(pb, &head1_guid);
put_guid(pb, &head2_guid);
put_le32(pb, 6);
put_le16(pb, 0);
end_header(pb, hpos);
/* title and other infos */
if (has_title) {
hpos = put_header(pb, &comment_header);
put_le16(pb, 2 * (strlen(s->title) + 1));
put_le16(pb, 2 * (strlen(s->author) + 1));
put_le16(pb, 2 * (strlen(s->copyright) + 1));
put_le16(pb, 2 * (strlen(s->comment) + 1));
put_le16(pb, 0);
put_str16_nolen(pb, s->title);
put_str16_nolen(pb, s->author);
put_str16_nolen(pb, s->copyright);
put_str16_nolen(pb, s->comment);
end_header(pb, hpos);
}
/* stream headers */
for(n=0;n<s->nb_streams;n++) {
INT64 es_pos;
ASFStream *stream = &asf->streams[n];
enc = &s->streams[n]->codec;
asf->streams[n].num = n + 1;
asf->streams[n].seq = 0;
switch(enc->codec_type) {
case CODEC_TYPE_AUDIO:
wav_extra_size = 0;
extra_size = 18 + wav_extra_size;
extra_size2 = 0;
/* Init the ticker */
ticker_init(&stream->pts_ticker,
enc->sample_rate,
1000 * enc->frame_size);
break;
default:
case CODEC_TYPE_VIDEO:
wav_extra_size = 0;
extra_size = 0x33;
extra_size2 = 0;
/* Init the ticker */
ticker_init(&stream->pts_ticker,
enc->frame_rate,
1000 * FRAME_RATE_BASE);
break;
}
hpos = put_header(pb, &stream_header);
if (enc->codec_type == CODEC_TYPE_AUDIO) {
put_guid(pb, &audio_stream);
put_guid(pb, &audio_conceal_none);
} else {
put_guid(pb, &video_stream);
put_guid(pb, &video_conceal_none);
}
put_le64(pb, 0); /* ??? */
es_pos = url_ftell(pb);
put_le32(pb, extra_size); /* wav header len */
put_le32(pb, extra_size2); /* additional data len */
put_le16(pb, n + 1); /* stream number */
put_le32(pb, 0); /* ??? */
if (enc->codec_type == CODEC_TYPE_AUDIO) {
/* WAVEFORMATEX header */
int wavsize = put_wav_header(pb, enc);
if (wavsize < 0)
return -1;
if (wavsize != extra_size) {
cur_pos = url_ftell(pb);
url_fseek(pb, es_pos, SEEK_SET);
put_le32(pb, wavsize); /* wav header len */
url_fseek(pb, cur_pos, SEEK_SET);
}
} else {
put_le32(pb, enc->width);
put_le32(pb, enc->height);
put_byte(pb, 2); /* ??? */
put_le16(pb, 40); /* size */
/* BITMAPINFOHEADER header */
put_bmp_header(pb, enc, codec_asf_bmp_tags);
}
end_header(pb, hpos);
}
/* media comments */
hpos = put_header(pb, &codec_comment_header);
put_guid(pb, &codec_comment1_header);
put_le32(pb, s->nb_streams);
for(n=0;n<s->nb_streams;n++) {
enc = &s->streams[n]->codec;
put_le16(pb, asf->streams[n].num);
put_str16(pb, enc->codec_name);
put_le16(pb, 0); /* no parameters */
/* id */
if (enc->codec_type == CODEC_TYPE_AUDIO) {
put_le16(pb, 2);
put_le16(pb, codec_get_tag(codec_wav_tags, enc->codec_id));
} else {
put_le16(pb, 4);
put_le32(pb, codec_get_tag(codec_asf_bmp_tags, enc->codec_id));
}
}
end_header(pb, hpos);
/* patch the header size fields */
cur_pos = url_ftell(pb);
header_size = cur_pos - header_offset;
if (url_is_streamed(&s->pb)) {
header_size += 8 + 30 + 50;
url_fseek(pb, header_offset - 10 - 30, SEEK_SET);
put_le16(pb, header_size);
url_fseek(pb, header_offset - 2 - 30, SEEK_SET);
put_le16(pb, header_size);
header_size -= 8 + 30 + 50;
}
header_size += 24 + 6;
url_fseek(pb, header_offset - 14, SEEK_SET);
put_le64(pb, header_size);
url_fseek(pb, cur_pos, SEEK_SET);
/* movie chunk, followed by packets of packet_size */
asf->data_offset = cur_pos;
put_guid(pb, &data_header);
put_le64(pb, data_chunk_size);
put_guid(pb, &my_guid);
put_le64(pb, asf->nb_packets); /* nb packets */
put_byte(pb, 1); /* ??? */
put_byte(pb, 1); /* ??? */
return 0;
}
static int asf_write_header(AVFormatContext *s)
{
ASFContext *asf;
asf = av_mallocz(sizeof(ASFContext));
if (!asf)
return -1;
s->priv_data = asf;
asf->packet_size = PACKET_SIZE;
asf->nb_packets = 0;
if (asf_write_header1(s, 0, 50) < 0) {
free(asf);
return -1;
}
put_flush_packet(&s->pb);
asf->packet_nb_frames = 0;
asf->packet_timestamp_start = -1;
asf->packet_timestamp_end = -1;
asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;
init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,
NULL, NULL, NULL, NULL);
return 0;
}
/* write a fixed size packet */
static int put_packet(AVFormatContext *s,
unsigned int timestamp, unsigned int duration,
int nb_frames, int padsize)
{
ASFContext *asf = s->priv_data;
ByteIOContext *pb = &s->pb;
int flags;
if (url_is_streamed(&s->pb)) {
put_chunk(s, 0x4424, asf->packet_size, 0);
}
put_byte(pb, 0x82);
put_le16(pb, 0);
flags = 0x01; /* nb segments present */
if (padsize > 0) {
if (padsize < 256)
flags |= 0x08;
else
flags |= 0x10;
}
put_byte(pb, flags); /* flags */
put_byte(pb, 0x5d);
if (flags & 0x10)
put_le16(pb, padsize - 2);
if (flags & 0x08)
put_byte(pb, padsize - 1);
put_le32(pb, timestamp);
put_le16(pb, duration);
put_byte(pb, nb_frames | 0x80);
return PACKET_HEADER_SIZE + ((flags & 0x18) >> 3);
}
static void flush_packet(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
int hdr_size, ptr;
hdr_size = put_packet(s, asf->packet_timestamp_start,
asf->packet_timestamp_end - asf->packet_timestamp_start,
asf->packet_nb_frames, asf->packet_size_left);
/* Clear out the padding bytes */
ptr = asf->packet_size - hdr_size - asf->packet_size_left;
memset(asf->packet_buf + ptr, 0, asf->packet_size_left);
put_buffer(&s->pb, asf->packet_buf, asf->packet_size - hdr_size);
put_flush_packet(&s->pb);
asf->nb_packets++;
asf->packet_nb_frames = 0;
asf->packet_timestamp_start = -1;
asf->packet_timestamp_end = -1;
asf->packet_size_left = asf->packet_size - PACKET_HEADER_SIZE;
init_put_byte(&asf->pb, asf->packet_buf, asf->packet_size, 1,
NULL, NULL, NULL, NULL);
}
static void put_frame_header(AVFormatContext *s, ASFStream *stream, int timestamp,
int payload_size, int frag_offset, int frag_len)
{
ASFContext *asf = s->priv_data;
ByteIOContext *pb = &asf->pb;
int val;
val = stream->num;
if (s->streams[val - 1]->codec.key_frame /* && frag_offset == 0 */)
val |= 0x80;
put_byte(pb, val);
put_byte(pb, stream->seq);
put_le32(pb, frag_offset); /* fragment offset */
put_byte(pb, 0x08); /* flags */
put_le32(pb, payload_size);
put_le32(pb, timestamp);
put_le16(pb, frag_len);
}
/* Output a frame. We suppose that payload_size <= PACKET_SIZE.
It is there that you understand that the ASF format is really
crap. They have misread the MPEG Systems spec !
*/
static void put_frame(AVFormatContext *s, ASFStream *stream, int timestamp,
UINT8 *buf, int payload_size)
{
ASFContext *asf = s->priv_data;
int frag_pos, frag_len, frag_len1;
frag_pos = 0;
while (frag_pos < payload_size) {
frag_len = payload_size - frag_pos;
frag_len1 = asf->packet_size_left - FRAME_HEADER_SIZE;
if (frag_len1 > 0) {
if (frag_len > frag_len1)
frag_len = frag_len1;
put_frame_header(s, stream, timestamp, payload_size, frag_pos, frag_len);
put_buffer(&asf->pb, buf, frag_len);
asf->packet_size_left -= (frag_len + FRAME_HEADER_SIZE);
asf->packet_timestamp_end = timestamp;
if (asf->packet_timestamp_start == -1)
asf->packet_timestamp_start = timestamp;
asf->packet_nb_frames++;
} else {
frag_len = 0;
}
frag_pos += frag_len;
buf += frag_len;
/* output the frame if filled */
if (asf->packet_size_left <= FRAME_HEADER_SIZE)
flush_packet(s);
}
stream->seq++;
}
static int asf_write_packet(AVFormatContext *s, int stream_index,
UINT8 *buf, int size, int force_pts)
{
ASFContext *asf = s->priv_data;
ASFStream *stream;
int timestamp;
INT64 duration;
AVCodecContext *codec;
stream = &asf->streams[stream_index];
codec = &s->streams[stream_index]->codec;
stream = &asf->streams[stream_index];
if (codec->codec_type == CODEC_TYPE_AUDIO) {
timestamp = (int)ticker_tick(&stream->pts_ticker, codec->frame_number);
duration = (codec->frame_number * codec->frame_size * INT64_C(10000000)) /
codec->sample_rate;
} else {
timestamp = (int)ticker_tick(&stream->pts_ticker, codec->frame_number);
duration = codec->frame_number *
((INT64_C(10000000) * FRAME_RATE_BASE) / codec->frame_rate);
}
if (duration > asf->duration)
asf->duration = duration;
put_frame(s, stream, timestamp, buf, size);
return 0;
}
static int asf_write_trailer(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
INT64 file_size;
/* flush the current packet */
if (asf->pb.buf_ptr > asf->pb.buffer)
flush_packet(s);
if (url_is_streamed(&s->pb)) {
put_chunk(s, 0x4524, 0, 0); /* end of stream */
} else {
/* rewrite an updated header */
file_size = url_ftell(&s->pb);
url_fseek(&s->pb, 0, SEEK_SET);
asf_write_header1(s, file_size, file_size - asf->data_offset);
}
put_flush_packet(&s->pb);
free(asf);
return 0;
}
/**********************************/
/* decoding */
//#define DEBUG
#ifdef DEBUG
static void print_guid(const GUID *g)
{
int i;
printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
for(i=0;i<8;i++)
printf(" 0x%02x,", g->v4[i]);
printf("}\n");
}
#endif
static void get_guid(ByteIOContext *s, GUID *g)
{
int i;
g->v1 = get_le32(s);
g->v2 = get_le16(s);
g->v3 = get_le16(s);
for(i=0;i<8;i++)
g->v4[i] = get_byte(s);
}
#if 0
static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
{
int len, c;
char *q;
len = get_le16(pb);
q = buf;
while (len > 0) {
c = get_le16(pb);
if ((q - buf) < buf_size - 1)
*q++ = c;
len--;
}
*q = '\0';
}
#endif
static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
{
int c;
char *q;
q = buf;
while (len > 0) {
c = get_le16(pb);
if ((q - buf) < buf_size - 1)
*q++ = c;
len-=2;
}
*q = '\0';
}
static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
ASFContext *asf;
GUID g;
ByteIOContext *pb = &s->pb;
AVStream *st;
ASFStream *asf_st;
int size, i, bps;
INT64 gsize;
asf = av_mallocz(sizeof(ASFContext));
if (!asf)
return -1;
s->priv_data = asf;
get_guid(pb, &g);
if (memcmp(&g, &asf_header, sizeof(GUID)))
goto fail;
get_le64(pb);
get_le32(pb);
get_byte(pb);
get_byte(pb);
for(;;) {
get_guid(pb, &g);
gsize = get_le64(pb);
#ifdef DEBUG
printf("%08Lx: ", url_ftell(pb) - 24);
print_guid(&g);
printf(" size=0x%Lx\n", gsize);
#endif
if (gsize < 24)
goto fail;
if (!memcmp(&g, &file_header, sizeof(GUID))) {
get_guid(pb, &g);
get_le64(pb); /* file size */
get_le64(pb); /* file time */
get_le64(pb); /* nb_packets */
get_le64(pb); /* length 0 in us */
get_le64(pb); /* length 1 in us */
get_le32(pb);
get_le32(pb);
get_le32(pb);
asf->packet_size = get_le32(pb);
get_le32(pb);
get_le32(pb);
} else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
int type, id, total_size;
unsigned int tag1;
INT64 pos1, pos2;
pos1 = url_ftell(pb);
st = av_mallocz(sizeof(AVStream));
if (!st)
goto fail;
s->streams[s->nb_streams++] = st;
asf_st = av_mallocz(sizeof(ASFStream));
if (!asf_st)
goto fail;
st->priv_data = asf_st;
get_guid(pb, &g);
if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
type = CODEC_TYPE_AUDIO;
} else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
type = CODEC_TYPE_VIDEO;
} else {
goto fail;
}
get_guid(pb, &g);
total_size = get_le64(pb);
get_le32(pb);
get_le32(pb);
st->id = get_le16(pb); /* stream id */
get_le32(pb);
st->codec.codec_type = type;
if (type == CODEC_TYPE_AUDIO) {
id = get_le16(pb);
st->codec.codec_tag = id;
st->codec.channels = get_le16(pb);
st->codec.sample_rate = get_le32(pb);
st->codec.bit_rate = get_le32(pb) * 8;
get_le16(pb); /* block align */
bps = get_le16(pb); /* bits per sample */
st->codec.codec_id = wav_codec_get_id(id, bps);
size = get_le16(pb);
url_fskip(pb, size);
/* We have to init the frame size at some point .... */
switch (st->codec.codec_id) {
case CODEC_ID_MP3LAME:
st->codec.frame_size = MPA_FRAME_SIZE;
break;
case CODEC_ID_PCM_S16LE:
case CODEC_ID_PCM_S16BE:
case CODEC_ID_PCM_U16LE:
case CODEC_ID_PCM_U16BE:
case CODEC_ID_PCM_S8:
case CODEC_ID_PCM_U8:
case CODEC_ID_PCM_ALAW:
case CODEC_ID_PCM_MULAW:
st->codec.frame_size = 1;
break;
default:
/* This is probably wrong, but it prevents a crash later */
st->codec.frame_size = 1;
break;
}
} else {
get_le32(pb);
get_le32(pb);
get_byte(pb);
size = get_le16(pb); /* size */
get_le32(pb); /* size */
st->codec.width = get_le32(pb);
st->codec.height = get_le32(pb);
st->codec.frame_rate = 25 * FRAME_RATE_BASE; /* XXX: find it */
get_le16(pb); /* panes */
get_le16(pb); /* depth */
tag1 = get_le32(pb);
st->codec.codec_tag = tag1;
st->codec.codec_id = codec_get_id(codec_asf_bmp_tags, tag1);
url_fskip(pb, size - 5 * 4);
}
pos2 = url_ftell(pb);
url_fskip(pb, gsize - (pos2 - pos1 + 24));
} else if (!memcmp(&g, &data_header, sizeof(GUID))) {
break;
} else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
int len1, len2, len3, len4, len5;
len1 = get_le16(pb);
len2 = get_le16(pb);
len3 = get_le16(pb);
len4 = get_le16(pb);
len5 = get_le16(pb);
get_str16_nolen(pb, len1, s->title, sizeof(s->title));
get_str16_nolen(pb, len2, s->author, sizeof(s->author));
get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
url_fskip(pb, len5);
#if 0
} else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
int v1, v2;
get_guid(pb, &g);
v1 = get_le32(pb);
v2 = get_le16(pb);
} else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
int len, v1, n, num;
char str[256], *q;
char tag[16];
get_guid(pb, &g);
print_guid(&g);
n = get_le32(pb);
for(i=0;i<n;i++) {
num = get_le16(pb); /* stream number */
get_str16(pb, str, sizeof(str));
get_str16(pb, str, sizeof(str));
len = get_le16(pb);
q = tag;
while (len > 0) {
v1 = get_byte(pb);
if ((q - tag) < sizeof(tag) - 1)
*q++ = v1;
len--;
}
*q = '\0';
}
#endif
} else if (url_feof(pb)) {
goto fail;
} else {
url_fseek(pb, gsize - 24, SEEK_CUR);
}
}
get_guid(pb, &g);
get_le64(pb);
get_byte(pb);
get_byte(pb);
asf->packet_size_left = 0;
return 0;
fail:
for(i=0;i<s->nb_streams;i++) {
AVStream *st = s->streams[i];
if (st)
free(st->priv_data);
free(st);
}
free(asf);
return -1;
}
static int asf_get_packet(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
ByteIOContext *pb = &s->pb;
int c, flags, timestamp, hdr_size;
hdr_size = 12;
c = get_byte(pb);
if (c != 0x82)
return -EIO;
get_le16(pb);
flags = get_byte(pb);
get_byte(pb);
asf->packet_padsize = 0;
if (flags & 0x10) {
asf->packet_padsize = get_le16(pb);
hdr_size += 2;
} else if (flags & 0x08) {
asf->packet_padsize = get_byte(pb);
hdr_size++;
}
timestamp = get_le32(pb);
get_le16(pb); /* duration */
get_byte(pb); /* nb_frames */
#ifdef DEBUG
printf("packet: size=%d padsize=%d\n", asf->packet_size, asf->packet_padsize);
#endif
asf->packet_size_left = asf->packet_size - hdr_size;
return 0;
}
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
AVStream *st;
ASFStream *asf_st;
ByteIOContext *pb = &s->pb;
int ret, num, seq, frag_offset, payload_size, frag_len;
int key_frame;
int timestamp, i;
for(;;) {
if (asf->packet_size_left < FRAME_HEADER_SIZE ||
asf->packet_size_left <= asf->packet_padsize) {
/* fail safe */
if (asf->packet_size_left)
url_fskip(pb, asf->packet_size_left);
ret = asf_get_packet(s);
if (ret < 0)
return -EIO;
}
/* read frame header */
num = get_byte(pb);
if (num & 0x80)
key_frame = 1;
else
key_frame = 0;
num &= 0x7f;
seq = get_byte(pb);
frag_offset = get_le32(pb);
get_byte(pb); /* flags */
payload_size = get_le32(pb);
timestamp = get_le32(pb);
frag_len = get_le16(pb);
#ifdef DEBUG
printf("num=%d seq=%d totsize=%d frag_off=%d frag_size=%d\n",
num, seq, payload_size, frag_offset, frag_len);
#endif
st = NULL;
for(i=0;i<s->nb_streams;i++) {
st = s->streams[i];
if (st->id == num)
break;
}
asf->packet_size_left -= FRAME_HEADER_SIZE + frag_len;
if (i == s->nb_streams) {
/* unhandled packet (should not happen) */
url_fskip(pb, frag_len);
} else {
asf_st = st->priv_data;
if (asf_st->frag_offset == 0) {
/* new packet */
av_new_packet(&asf_st->pkt, payload_size);
asf_st->seq = seq;
if (key_frame)
asf_st->pkt.flags |= PKT_FLAG_KEY;
asf_st->pkt.pts = timestamp;
} else {
if (seq == asf_st->seq &&
frag_offset == asf_st->frag_offset) {
/* continuing packet */
} else {
/* cannot continue current packet: free it */
av_free_packet(&asf_st->pkt);
asf_st->frag_offset = 0;
if (frag_offset != 0) {
/* cannot create new packet */
url_fskip(pb, frag_len);
goto next_frame;
} else {
/* create new packet */
av_new_packet(&asf_st->pkt, payload_size);
asf_st->seq = seq;
}
}
}
/* read data */
get_buffer(pb, asf_st->pkt.data + frag_offset, frag_len);
asf_st->frag_offset += frag_len;
/* test if whole packet read */
if (asf_st->frag_offset == asf_st->pkt.size) {
/* return packet */
asf_st->pkt.stream_index = i;
asf_st->frag_offset = 0;
memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
break;
}
}
next_frame:;
}
return 0;
}
static int asf_read_close(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
int i;
for(i=0;i<s->nb_streams;i++) {
AVStream *st = s->streams[i];
free(st->priv_data);
}
free(asf);
return 0;
}
AVFormat asf_format = {
"asf",
"asf format",
"application/octet-stream",
"asf,wmv",
#ifdef CONFIG_MP3LAME
CODEC_ID_MP3LAME,
#else
CODEC_ID_MP2,
#endif
CODEC_ID_MSMPEG4,
asf_write_header,
asf_write_packet,
asf_write_trailer,
asf_read_header,
asf_read_packet,
asf_read_close,
};
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