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ffmpeg-rockchip/libavformat/asfdec_o.c
Michael Niedermayer 1f1a368169 avformat/asfdec_o: limit recursion depth in asf_read_unknown() 
The threshold of 5 is arbitrary, both smaller and larger should work fine

Fixes: Stack overflow
Fixes: 50603/clusterfuzz-testcase-minimized-ffmpeg_dem_ASF_O_fuzzer-6049302564175872

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2022-08-31 18:03:55 +02:00

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/*
* Microsoft Advanced Streaming Format demuxer
* Copyright (c) 2014 Alexandra Hájková
*
* 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/attributes.h"
#include "libavutil/common.h"
#include "libavutil/dict.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/time_internal.h"
#include "avformat.h"
#include "avlanguage.h"
#include "demux.h"
#include "internal.h"
#include "riff.h"
#include "asf.h"
#include "asfcrypt.h"
#define ASF_BOOL 0x2
#define ASF_WORD 0x5
#define ASF_GUID 0x6
#define ASF_DWORD 0x3
#define ASF_QWORD 0x4
#define ASF_UNICODE 0x0
#define ASF_FLAG_BROADCAST 0x1
#define ASF_BYTE_ARRAY 0x1
#define ASF_TYPE_AUDIO 0x2
#define ASF_TYPE_VIDEO 0x1
#define ASF_STREAM_NUM 0x7F
#define ASF_MAX_STREAMS 128
#define BMP_HEADER_SIZE 40
#define ASF_NUM_OF_PAYLOADS 0x3F
#define ASF_ERROR_CORRECTION_LENGTH_TYPE 0x60
#define ASF_PACKET_ERROR_CORRECTION_DATA_SIZE 0x2
typedef struct GUIDParseTable {
const char *name;
ff_asf_guid guid;
int (*read_object)(AVFormatContext *, const struct GUIDParseTable *);
int is_subobject;
} GUIDParseTable;
typedef struct ASFPacket {
AVPacket *avpkt;
int64_t dts;
uint32_t frame_num; // ASF payloads with the same number are parts of the same frame
int flags;
int data_size;
int duration;
int size_left;
uint8_t stream_index;
} ASFPacket;
typedef struct ASFStream {
uint8_t stream_index; // from packet header
int index; // stream index in AVFormatContext, set in asf_read_stream_properties
int type;
int indexed; // added index entries from the Simple Index Object or not
int8_t span; // for deinterleaving
uint16_t virtual_pkt_len;
uint16_t virtual_chunk_len;
int16_t lang_idx;
ASFPacket pkt;
} ASFStream;
typedef struct ASFStreamData{
char langs[32];
AVDictionary *asf_met; // for storing per-stream metadata
AVRational aspect_ratio;
} ASFStreamData;
typedef struct ASFContext {
int data_reached;
int is_simple_index; // is simple index present or not 1/0
int is_header;
uint64_t preroll;
uint64_t nb_packets; // ASF packets
uint32_t packet_size;
int64_t send_time;
int duration;
uint32_t b_flags; // flags with broadcast flag
uint32_t prop_flags; // file properties object flags
uint64_t data_size; // data object size
uint64_t unknown_size; // size of the unknown object
int64_t offset; // offset of the current object
int64_t data_offset;
int64_t first_packet_offset; // packet offset
int64_t unknown_offset; // for top level header objects or subobjects without specified behavior
int in_asf_read_unknown;
// ASF file must not contain more than 128 streams according to the specification
ASFStream *asf_st[ASF_MAX_STREAMS];
ASFStreamData asf_sd[ASF_MAX_STREAMS];
int nb_streams;
int stream_index; // from packet header, for the subpayload case
// packet parameters
uint64_t sub_header_offset; // offset of subpayload header
int64_t sub_dts;
uint8_t dts_delta; // for subpayloads
uint32_t packet_size_internal; // packet size stored inside ASFPacket, can be 0
int64_t packet_offset; // offset of the current packet inside Data Object
uint32_t pad_len; // padding after payload
uint32_t rep_data_len;
// packet state
uint64_t sub_left; // subpayloads left or not
unsigned int nb_sub; // number of subpayloads read so far from the current ASF packet
uint16_t mult_sub_len; // total length of subpayloads array inside multiple payload
uint64_t nb_mult_left; // multiple payloads left
int return_subpayload;
enum {
PARSE_PACKET_HEADER,
READ_SINGLE,
READ_MULTI,
READ_MULTI_SUB
} state;
} ASFContext;
static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size);
static const GUIDParseTable *find_guid(ff_asf_guid guid);
static int asf_probe(const AVProbeData *pd)
{
/* check file header */
if (!ff_guidcmp(pd->buf, &ff_asf_header))
return AVPROBE_SCORE_MAX/2;
else
return 0;
}
static void swap_guid(ff_asf_guid guid)
{
FFSWAP(unsigned char, guid[0], guid[3]);
FFSWAP(unsigned char, guid[1], guid[2]);
FFSWAP(unsigned char, guid[4], guid[5]);
FFSWAP(unsigned char, guid[6], guid[7]);
}
static void align_position(AVIOContext *pb, int64_t offset, uint64_t size)
{
if (size < INT64_MAX - offset && avio_tell(pb) != offset + size)
avio_seek(pb, offset + size, SEEK_SET);
}
static int asf_read_unknown(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t size = avio_rl64(pb);
int ret;
if (size > INT64_MAX || asf->in_asf_read_unknown > 5)
return AVERROR_INVALIDDATA;
if (asf->is_header)
asf->unknown_size = size;
asf->is_header = 0;
if (!g->is_subobject) {
if (!(ret = strcmp(g->name, "Header Extension")))
avio_skip(pb, 22); // skip reserved fields and Data Size
asf->in_asf_read_unknown ++;
ret = detect_unknown_subobject(s, asf->unknown_offset,
asf->unknown_size);
asf->in_asf_read_unknown --;
if (ret < 0)
return ret;
} else {
if (size < 24) {
av_log(s, AV_LOG_ERROR, "Too small size %"PRIu64" (< 24).\n", size);
return AVERROR_INVALIDDATA;
}
avio_skip(pb, size - 24);
}
return 0;
}
static int get_asf_string(AVIOContext *pb, int maxlen, char *buf, int buflen)
{
char *q = buf;
int ret = 0;
if (buflen <= 0)
return AVERROR(EINVAL);
while (ret + 1 < maxlen) {
uint8_t tmp;
uint32_t ch;
GET_UTF16(ch, (ret += 2) <= maxlen ? avio_rl16(pb) : 0, break;);
PUT_UTF8(ch, tmp, if (q - buf < buflen - 1) *q++ = tmp;)
}
*q = 0;
return ret;
}
static int asf_read_marker(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t size = avio_rl64(pb);
int i, nb_markers, ret;
size_t len;
char name[1024];
avio_skip(pb, 8);
avio_skip(pb, 8); // skip reserved GUID
nb_markers = avio_rl32(pb);
avio_skip(pb, 2); // skip reserved field
len = avio_rl16(pb);
for (i = 0; i < len; i++)
avio_skip(pb, 1);
for (i = 0; i < nb_markers; i++) {
int64_t pts;
avio_skip(pb, 8);
pts = avio_rl64(pb);
pts -= asf->preroll * 10000;
avio_skip(pb, 2); // entry length
avio_skip(pb, 4); // send time
avio_skip(pb, 4); // flags
len = avio_rl32(pb);
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
if ((ret = avio_get_str16le(pb, len, name,
sizeof(name))) < len)
avio_skip(pb, len - ret);
avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pts,
AV_NOPTS_VALUE, name);
}
align_position(pb, asf->offset, size);
return 0;
}
static int asf_read_metadata(AVFormatContext *s, const char *title, uint16_t len,
unsigned char *ch, uint16_t buflen)
{
AVIOContext *pb = s->pb;
avio_get_str16le(pb, len, ch, buflen);
if (ch[0]) {
if (av_dict_set(&s->metadata, title, ch, 0) < 0)
av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
}
return 0;
}
static int asf_read_value(AVFormatContext *s, const uint8_t *name,
uint16_t val_len, int type, AVDictionary **met)
{
int ret;
uint8_t *value;
uint16_t buflen = 2 * val_len + 1;
AVIOContext *pb = s->pb;
value = av_malloc(buflen);
if (!value)
return AVERROR(ENOMEM);
if (type == ASF_UNICODE) {
// get_asf_string reads UTF-16 and converts it to UTF-8 which needs longer buffer
if ((ret = get_asf_string(pb, val_len, value, buflen)) < 0)
goto failed;
if (av_dict_set(met, name, value, 0) < 0)
av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
} else {
char buf[256];
if (val_len > sizeof(buf)) {
ret = AVERROR_INVALIDDATA;
goto failed;
}
if ((ret = avio_read(pb, value, val_len)) < 0)
goto failed;
if (ret < 2 * val_len)
value[ret] = '\0';
else
value[2 * val_len - 1] = '\0';
snprintf(buf, sizeof(buf), "%s", value);
if (av_dict_set(met, name, buf, 0) < 0)
av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
}
av_freep(&value);
return 0;
failed:
av_freep(&value);
return ret;
}
static int asf_read_generic_value(AVIOContext *pb, int type, uint64_t *value)
{
switch (type) {
case ASF_BOOL:
*value = avio_rl16(pb);
break;
case ASF_DWORD:
*value = avio_rl32(pb);
break;
case ASF_QWORD:
*value = avio_rl64(pb);
break;
case ASF_WORD:
*value = avio_rl16(pb);
break;
default:
return AVERROR_INVALIDDATA;
}
return 0;
}
static int asf_set_metadata(AVFormatContext *s, const uint8_t *name,
int type, AVDictionary **met)
{
AVIOContext *pb = s->pb;
uint64_t value;
char buf[32];
int ret;
ret = asf_read_generic_value(pb, type, &value);
if (ret < 0)
return ret;
snprintf(buf, sizeof(buf), "%"PRIu64, value);
if (av_dict_set(met, name, buf, 0) < 0)
av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
return 0;
}
static int process_metadata(AVFormatContext *s, const uint8_t *name, uint16_t name_len,
uint16_t val_len, uint16_t type, AVDictionary **met)
{
int ret;
ff_asf_guid guid;
if (val_len) {
switch (type) {
case ASF_UNICODE:
asf_read_value(s, name, val_len, type, met);
break;
case ASF_BYTE_ARRAY:
if (ff_asf_handle_byte_array(s, name, val_len) > 0)
asf_read_value(s, name, val_len, type, met);
break;
case ASF_GUID:
ff_get_guid(s->pb, &guid);
break;
default:
if ((ret = asf_set_metadata(s, name, type, met)) < 0)
return ret;
break;
}
}
return 0;
}
static int asf_read_ext_content(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t size = avio_rl64(pb);
uint16_t nb_desc = avio_rl16(pb);
int i, ret;
for (i = 0; i < nb_desc; i++) {
uint16_t name_len, type, val_len;
uint8_t *name = NULL;
name_len = avio_rl16(pb);
if (!name_len)
return AVERROR_INVALIDDATA;
name = av_malloc(name_len);
if (!name)
return AVERROR(ENOMEM);
avio_get_str16le(pb, name_len, name,
name_len);
type = avio_rl16(pb);
// BOOL values are 16 bits long in the Metadata Object
// but 32 bits long in the Extended Content Description Object
if (type == ASF_BOOL)
type = ASF_DWORD;
val_len = avio_rl16(pb);
ret = process_metadata(s, name, name_len, val_len, type, &s->metadata);
av_freep(&name);
if (ret < 0)
return ret;
}
align_position(pb, asf->offset, size);
return 0;
}
static AVStream *find_stream(AVFormatContext *s, uint16_t st_num)
{
AVStream *st = NULL;
ASFContext *asf = s->priv_data;
int i;
for (i = 0; i < asf->nb_streams; i++) {
if (asf->asf_st[i]->stream_index == st_num) {
st = s->streams[asf->asf_st[i]->index];
break;
}
}
return st;
}
static int asf_store_aspect_ratio(AVFormatContext *s, uint8_t st_num, uint8_t *name, int type)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t value = 0;
int ret;
ret = asf_read_generic_value(pb, type, &value);
if (ret < 0)
return ret;
if (st_num < ASF_MAX_STREAMS) {
if (!strcmp(name, "AspectRatioX"))
asf->asf_sd[st_num].aspect_ratio.num = value;
else
asf->asf_sd[st_num].aspect_ratio.den = value;
}
return 0;
}
static int asf_read_metadata_obj(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t size = avio_rl64(pb);
uint16_t nb_recs = avio_rl16(pb); // number of records in the Description Records list
int i, ret;
for (i = 0; i < nb_recs; i++) {
uint16_t name_len, buflen, type, val_len, st_num;
uint8_t *name = NULL;
avio_skip(pb, 2); // skip reserved field
st_num = avio_rl16(pb);
name_len = avio_rl16(pb);
buflen = 2 * name_len + 1;
if (!name_len)
break;
type = avio_rl16(pb);
val_len = avio_rl32(pb);
name = av_malloc(buflen);
if (!name)
return AVERROR(ENOMEM);
avio_get_str16le(pb, name_len, name,
buflen);
if (!strcmp(name, "AspectRatioX") || !strcmp(name, "AspectRatioY")) {
ret = asf_store_aspect_ratio(s, st_num, name, type);
if (ret < 0) {
av_freep(&name);
break;
}
} else {
if (st_num < ASF_MAX_STREAMS) {
if ((ret = process_metadata(s, name, name_len, val_len, type,
st_num ? &asf->asf_sd[st_num].asf_met
: &s->metadata)) < 0) {
av_freep(&name);
break;
}
}
}
av_freep(&name);
}
align_position(pb, asf->offset, size);
return 0;
}
static int asf_read_content_desc(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int i;
static const char *const titles[] =
{ "Title", "Author", "Copyright", "Description", "Rate" };
uint16_t len[5], buflen[5] = { 0 };
uint8_t *ch;
uint64_t size = avio_rl64(pb);
for (i = 0; i < 5; i++) {
len[i] = avio_rl16(pb);
// utf8 string should be <= 2 * utf16 string, extra byte for the terminator
buflen[i] = 2 * len[i] + 1;
}
for (i = 0; i < 5; i++) {
ch = av_malloc(buflen[i]);
if (!ch)
return(AVERROR(ENOMEM));
asf_read_metadata(s, titles[i], len[i], ch, buflen[i]);
av_freep(&ch);
}
align_position(pb, asf->offset, size);
return 0;
}
static int asf_read_properties(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
time_t creation_time;
avio_rl64(pb); // read object size
avio_skip(pb, 16); // skip File ID
avio_skip(pb, 8); // skip File size
creation_time = avio_rl64(pb);
if (!(asf->b_flags & ASF_FLAG_BROADCAST)) {
struct tm tmbuf;
struct tm *tm;
char buf[64];
// creation date is in 100 ns units from 1 Jan 1601, conversion to s
creation_time /= 10000000;
// there are 11644473600 seconds between 1 Jan 1601 and 1 Jan 1970
creation_time -= 11644473600;
tm = gmtime_r(&creation_time, &tmbuf);
if (tm) {
if (!strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm))
buf[0] = '\0';
} else
buf[0] = '\0';
if (buf[0]) {
if (av_dict_set(&s->metadata, "creation_time", buf, 0) < 0)
av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
}
}
asf->nb_packets = avio_rl64(pb);
asf->duration = avio_rl64(pb) / 10000; // stream duration
avio_skip(pb, 8); // skip send duration
asf->preroll = avio_rl64(pb);
asf->duration -= asf->preroll;
asf->b_flags = avio_rl32(pb);
avio_skip(pb, 4); // skip minimal packet size
asf->packet_size = avio_rl32(pb);
avio_skip(pb, 4); // skip max_bitrate
return 0;
}
static int parse_video_info(AVFormatContext *avfmt, AVIOContext *pb, AVStream *st)
{
uint16_t size_asf; // ASF-specific Format Data size
uint32_t size_bmp; // BMP_HEADER-specific Format Data size
unsigned int tag;
st->codecpar->width = avio_rl32(pb);
st->codecpar->height = avio_rl32(pb);
avio_skip(pb, 1); // skip reserved flags
size_asf = avio_rl16(pb);
tag = ff_get_bmp_header(pb, st, &size_bmp);
st->codecpar->codec_tag = tag;
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag);
size_bmp = FFMAX(size_asf, size_bmp);
if (size_bmp > BMP_HEADER_SIZE) {
int ret = ff_get_extradata(avfmt, st->codecpar, pb, size_bmp - BMP_HEADER_SIZE);
if (ret < 0)
return ret;
}
return 0;
}
static int asf_read_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t size;
uint32_t err_data_len, ts_data_len; // type specific data length
uint16_t flags;
ff_asf_guid stream_type;
enum AVMediaType type;
int i, ret;
uint8_t stream_index;
AVStream *st;
ASFStream *asf_st;
// ASF file must not contain more than 128 streams according to the specification
if (asf->nb_streams >= ASF_MAX_STREAMS)
return AVERROR_INVALIDDATA;
size = avio_rl64(pb);
ff_get_guid(pb, &stream_type);
if (!ff_guidcmp(&stream_type, &ff_asf_audio_stream))
type = AVMEDIA_TYPE_AUDIO;
else if (!ff_guidcmp(&stream_type, &ff_asf_video_stream))
type = AVMEDIA_TYPE_VIDEO;
else if (!ff_guidcmp(&stream_type, &ff_asf_jfif_media))
type = AVMEDIA_TYPE_VIDEO;
else if (!ff_guidcmp(&stream_type, &ff_asf_command_stream))
type = AVMEDIA_TYPE_DATA;
else if (!ff_guidcmp(&stream_type,
&ff_asf_ext_stream_embed_stream_header))
type = AVMEDIA_TYPE_UNKNOWN;
else
return AVERROR_INVALIDDATA;
ff_get_guid(pb, &stream_type); // error correction type
avio_skip(pb, 8); // skip the time offset
ts_data_len = avio_rl32(pb);
err_data_len = avio_rl32(pb);
flags = avio_rl16(pb); // bit 15 - Encrypted Content
stream_index = flags & ASF_STREAM_NUM;
for (i = 0; i < asf->nb_streams; i++)
if (stream_index == asf->asf_st[i]->stream_index) {
av_log(s, AV_LOG_WARNING,
"Duplicate stream found, this stream will be ignored.\n");
align_position(pb, asf->offset, size);
return 0;
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 32, 1, 1000); // pts should be dword, in milliseconds
st->codecpar->codec_type = type;
asf->asf_st[asf->nb_streams] = av_mallocz(sizeof(*asf_st));
if (!asf->asf_st[asf->nb_streams])
return AVERROR(ENOMEM);
asf_st = asf->asf_st[asf->nb_streams];
asf->nb_streams++;
asf_st->stream_index = stream_index;
asf_st->index = st->index;
asf_st->indexed = 0;
st->id = flags & ASF_STREAM_NUM;
asf_st->pkt.data_size = 0;
asf_st->pkt.avpkt = av_packet_alloc();
if (!asf_st->pkt.avpkt)
return AVERROR(ENOMEM);
avio_skip(pb, 4); // skip reserved field
switch (type) {
case AVMEDIA_TYPE_AUDIO:
asf_st->type = AVMEDIA_TYPE_AUDIO;
if ((ret = ff_get_wav_header(s, pb, st->codecpar, ts_data_len, 0)) < 0)
return ret;
break;
case AVMEDIA_TYPE_VIDEO:
asf_st->type = AVMEDIA_TYPE_VIDEO;
if ((ret = parse_video_info(s, pb, st)) < 0)
return ret;
break;
default:
avio_skip(pb, ts_data_len);
break;
}
if (err_data_len) {
if (type == AVMEDIA_TYPE_AUDIO) {
uint8_t span = avio_r8(pb);
if (span > 1) {
asf_st->span = span;
asf_st->virtual_pkt_len = avio_rl16(pb);
asf_st->virtual_chunk_len = avio_rl16(pb);
if (!asf_st->virtual_chunk_len || !asf_st->virtual_pkt_len)
return AVERROR_INVALIDDATA;
avio_skip(pb, err_data_len - 5);
} else
avio_skip(pb, err_data_len - 1);
} else
avio_skip(pb, err_data_len);
}
align_position(pb, asf->offset, size);
return 0;
}
static void set_language(AVFormatContext *s, const char *rfc1766, AVDictionary **met)
{
// language abbr should contain at least 2 chars
if (rfc1766 && strlen(rfc1766) > 1) {
const char primary_tag[3] = { rfc1766[0], rfc1766[1], '\0' }; // ignore country code if any
const char *iso6392 = ff_convert_lang_to(primary_tag,
AV_LANG_ISO639_2_BIBL);
if (iso6392)
if (av_dict_set(met, "language", iso6392, 0) < 0)
av_log(s, AV_LOG_WARNING, "av_dict_set failed.\n");
}
}
static int asf_read_ext_stream_properties(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = NULL;
ff_asf_guid guid;
uint16_t nb_st_name, nb_pay_exts, st_num, lang_idx;
int i, ret;
uint32_t bitrate;
uint64_t start_time, end_time, time_per_frame;
uint64_t size = avio_rl64(pb);
start_time = avio_rl64(pb);
end_time = avio_rl64(pb);
bitrate = avio_rl32(pb);
avio_skip(pb, 28); // skip some unused values
st_num = avio_rl16(pb);
st_num &= ASF_STREAM_NUM;
lang_idx = avio_rl16(pb); // Stream Language ID Index
if (lang_idx >= ASF_MAX_STREAMS)
return AVERROR_INVALIDDATA;
for (i = 0; i < asf->nb_streams; i++) {
if (st_num == asf->asf_st[i]->stream_index) {
st = s->streams[asf->asf_st[i]->index];
asf->asf_st[i]->lang_idx = lang_idx;
break;
}
}
time_per_frame = avio_rl64(pb); // average time per frame
if (st) {
st->start_time = start_time;
st->duration = end_time - start_time;
st->codecpar->bit_rate = bitrate;
st->avg_frame_rate.num = 10000000;
st->avg_frame_rate.den = time_per_frame;
}
nb_st_name = avio_rl16(pb);
nb_pay_exts = avio_rl16(pb);
for (i = 0; i < nb_st_name; i++) {
uint16_t len;
avio_rl16(pb); // Language ID Index
len = avio_rl16(pb);
avio_skip(pb, len);
}
for (i = 0; i < nb_pay_exts; i++) {
uint32_t len;
avio_skip(pb, 16); // Extension System ID
avio_skip(pb, 2); // Extension Data Size
len = avio_rl32(pb);
avio_skip(pb, len);
}
if ((ret = ff_get_guid(pb, &guid)) < 0) {
align_position(pb, asf->offset, size);
return 0;
}
g = find_guid(guid);
if (g && !(strcmp(g->name, "Stream Properties"))) {
if ((ret = g->read_object(s, g)) < 0)
return ret;
}
align_position(pb, asf->offset, size);
return 0;
}
static int asf_read_language_list(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int i, ret;
uint64_t size = avio_rl64(pb);
uint16_t nb_langs = avio_rl16(pb);
if (nb_langs < ASF_MAX_STREAMS) {
for (i = 0; i < nb_langs; i++) {
size_t len;
len = avio_r8(pb);
if (!len)
len = 6;
if ((ret = get_asf_string(pb, len, asf->asf_sd[i].langs,
sizeof(asf->asf_sd[i].langs))) < 0) {
return ret;
}
}
}
align_position(pb, asf->offset, size);
return 0;
}
// returns data object offset when reading this object for the first time
static int asf_read_data(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t size = asf->data_size = avio_rl64(pb);
int i;
if (!asf->data_reached) {
asf->data_reached = 1;
asf->data_offset = asf->offset;
}
for (i = 0; i < asf->nb_streams; i++) {
if (!(asf->b_flags & ASF_FLAG_BROADCAST))
s->streams[i]->duration = asf->duration;
}
asf->nb_mult_left = 0;
asf->sub_left = 0;
asf->state = PARSE_PACKET_HEADER;
asf->return_subpayload = 0;
asf->packet_size_internal = 0;
avio_skip(pb, 16); // skip File ID
size = avio_rl64(pb); // Total Data Packets
if (size != asf->nb_packets)
av_log(s, AV_LOG_WARNING,
"Number of Packets from File Properties Object is not equal to Total"
"Datapackets value! num of packets %"PRIu64" total num %"PRIu64".\n",
size, asf->nb_packets);
avio_skip(pb, 2); // skip reserved field
asf->first_packet_offset = avio_tell(pb);
if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(asf->b_flags & ASF_FLAG_BROADCAST))
align_position(pb, asf->offset, asf->data_size);
return 0;
}
static int asf_read_simple_index(AVFormatContext *s, const GUIDParseTable *g)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = NULL;
uint64_t interval; // index entry time interval in 100 ns units, usually it's 1s
uint32_t pkt_num, nb_entries;
int32_t prev_pkt_num = -1;
int i;
int64_t offset;
uint64_t size = avio_rl64(pb);
// simple index objects should be ordered by stream number, this loop tries to find
// the first not indexed video stream
for (i = 0; i < asf->nb_streams; i++) {
if ((asf->asf_st[i]->type == AVMEDIA_TYPE_VIDEO) && !asf->asf_st[i]->indexed) {
asf->asf_st[i]->indexed = 1;
st = s->streams[asf->asf_st[i]->index];
break;
}
}
if (!st) {
avio_skip(pb, size - 24); // if there's no video stream, skip index object
return 0;
}
avio_skip(pb, 16); // skip File ID
interval = avio_rl64(pb);
avio_skip(pb, 4);
nb_entries = avio_rl32(pb);
for (i = 0; i < nb_entries; i++) {
pkt_num = avio_rl32(pb);
offset = avio_skip(pb, 2);
if (offset < 0) {
av_log(s, AV_LOG_ERROR, "Skipping failed in asf_read_simple_index.\n");
return offset;
}
if (prev_pkt_num != pkt_num) {
av_add_index_entry(st, asf->first_packet_offset + asf->packet_size *
pkt_num, av_rescale(interval, i, 10000),
asf->packet_size, 0, AVINDEX_KEYFRAME);
prev_pkt_num = pkt_num;
}
}
asf->is_simple_index = 1;
align_position(pb, asf->offset, size);
return 0;
}
static const GUIDParseTable gdef[] = {
{ "Data", { 0x75, 0xB2, 0x26, 0x36, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_data, 1 },
{ "Simple Index", { 0x33, 0x00, 0x08, 0x90, 0xE5, 0xB1, 0x11, 0xCF, 0x89, 0xF4, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xCB }, asf_read_simple_index, 1 },
{ "Content Description", { 0x75, 0xB2, 0x26, 0x33, 0x66 ,0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_content_desc, 1 },
{ "Extended Content Description", { 0xD2, 0xD0, 0xA4, 0x40, 0xE3, 0x07, 0x11, 0xD2, 0x97, 0xF0, 0x00, 0xA0, 0xC9, 0x5e, 0xA8, 0x50 }, asf_read_ext_content, 1 },
{ "Stream Bitrate Properties", { 0x7B, 0xF8, 0x75, 0xCE, 0x46, 0x8D, 0x11, 0xD1, 0x8D, 0x82, 0x00, 0x60, 0x97, 0xC9, 0xA2, 0xB2 }, asf_read_unknown, 1 },
{ "File Properties", { 0x8C, 0xAB, 0xDC, 0xA1, 0xA9, 0x47, 0x11, 0xCF, 0x8E, 0xE4, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_properties, 1 },
{ "Header Extension", { 0x5F, 0xBF, 0x03, 0xB5, 0xA9, 0x2E, 0x11, 0xCF, 0x8E, 0xE3, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_unknown, 0 },
{ "Stream Properties", { 0xB7, 0xDC, 0x07, 0x91, 0xA9, 0xB7, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_stream_properties, 1 },
{ "Codec List", { 0x86, 0xD1, 0x52, 0x40, 0x31, 0x1D, 0x11, 0xD0, 0xA3, 0xA4, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
{ "Marker", { 0xF4, 0x87, 0xCD, 0x01, 0xA9, 0x51, 0x11, 0xCF, 0x8E, 0xE6, 0x00, 0xC0, 0x0C, 0x20, 0x53, 0x65 }, asf_read_marker, 1 },
{ "Script Command", { 0x1E, 0xFB, 0x1A, 0x30, 0x0B, 0x62, 0x11, 0xD0, 0xA3, 0x9B, 0x00, 0xA0, 0xC9, 0x03, 0x48, 0xF6 }, asf_read_unknown, 1 },
{ "Language List", { 0x7C, 0x43, 0x46, 0xa9, 0xef, 0xe0, 0x4B, 0xFC, 0xB2, 0x29, 0x39, 0x3e, 0xde, 0x41, 0x5c, 0x85 }, asf_read_language_list, 1},
{ "Padding", { 0x18, 0x06, 0xD4, 0x74, 0xCA, 0xDF, 0x45, 0x09, 0xA4, 0xBA, 0x9A, 0xAB, 0xCB, 0x96, 0xAA, 0xE8 }, asf_read_unknown, 1 },
{ "DRMv1 Header", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
{ "DRMv2 Header", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9c }, asf_read_unknown, 1 },
{ "Index", { 0xD6, 0xE2, 0x29, 0xD3, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
{ "Media Object Index", { 0xFE, 0xB1, 0x03, 0xF8, 0x12, 0xAD, 0x4C, 0x64, 0x84, 0x0F, 0x2A, 0x1D, 0x2F, 0x7A, 0xD4, 0x8C }, asf_read_unknown, 1 },
{ "Timecode Index", { 0x3C, 0xB7, 0x3F, 0xD0, 0x0C, 0x4A, 0x48, 0x03, 0x95, 0x3D, 0xED, 0xF7, 0xB6, 0x22, 0x8F, 0x0C }, asf_read_unknown, 0 },
{ "Bitrate_Mutual_Exclusion", { 0xD6, 0xE2, 0x29, 0xDC, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
{ "Error Correction", { 0x75, 0xB2, 0x26, 0x35, 0x66, 0x8E, 0x11, 0xCF, 0xA6, 0xD9, 0x00, 0xAA, 0x00, 0x62, 0xCE, 0x6C }, asf_read_unknown, 1 },
{ "Content Branding", { 0x22, 0x11, 0xB3, 0xFA, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
{ "Content Encryption", { 0x22, 0x11, 0xB3, 0xFB, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
{ "Extended Content Encryption", { 0x29, 0x8A, 0xE6, 0x14, 0x26, 0x22, 0x4C, 0x17, 0xB9, 0x35, 0xDA, 0xE0, 0x7E, 0xE9, 0x28, 0x9C }, asf_read_unknown, 1 },
{ "Digital Signature", { 0x22, 0x11, 0xB3, 0xFC, 0xBD, 0x23, 0x11, 0xD2, 0xB4, 0xB7, 0x00, 0xA0, 0xC9, 0x55, 0xFC, 0x6E }, asf_read_unknown, 1 },
{ "Extended Stream Properties", { 0x14, 0xE6, 0xA5, 0xCB, 0xC6, 0x72, 0x43, 0x32, 0x83, 0x99, 0xA9, 0x69, 0x52, 0x06, 0x5B, 0x5A }, asf_read_ext_stream_properties, 1 },
{ "Advanced Mutual Exclusion", { 0xA0, 0x86, 0x49, 0xCF, 0x47, 0x75, 0x46, 0x70, 0x8A, 0x16, 0x6E, 0x35, 0x35, 0x75, 0x66, 0xCD }, asf_read_unknown, 1 },
{ "Group Mutual Exclusion", { 0xD1, 0x46, 0x5A, 0x40, 0x5A, 0x79, 0x43, 0x38, 0xB7, 0x1B, 0xE3, 0x6B, 0x8F, 0xD6, 0xC2, 0x49 }, asf_read_unknown, 1},
{ "Stream Prioritization", { 0xD4, 0xFE, 0xD1, 0x5B, 0x88, 0xD3, 0x45, 0x4F, 0x81, 0xF0, 0xED, 0x5C, 0x45, 0x99, 0x9E, 0x24 }, asf_read_unknown, 1 },
{ "Bandwidth Sharing Object", { 0xA6, 0x96, 0x09, 0xE6, 0x51, 0x7B, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
{ "Metadata", { 0xC5, 0xF8, 0xCB, 0xEA, 0x5B, 0xAF, 0x48, 0x77, 0x84, 0x67, 0xAA, 0x8C, 0x44, 0xFA, 0x4C, 0xCA }, asf_read_metadata_obj, 1 },
{ "Metadata Library", { 0x44, 0x23, 0x1C, 0x94, 0x94, 0x98, 0x49, 0xD1, 0xA1, 0x41, 0x1D, 0x13, 0x4E, 0x45, 0x70, 0x54 }, asf_read_metadata_obj, 1 },
{ "Audio Spread", { 0xBF, 0xC3, 0xCD, 0x50, 0x61, 0x8F, 0x11, 0xCF, 0x8B, 0xB2, 0x00, 0xAA, 0x00, 0xB4, 0xE2, 0x20 }, asf_read_unknown, 1 },
{ "Index Parameters", { 0xD6, 0xE2, 0x29, 0xDF, 0x35, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
{ "Content Encryption System Windows Media DRM Network Devices",
{ 0x7A, 0x07, 0x9B, 0xB6, 0xDA, 0XA4, 0x4e, 0x12, 0xA5, 0xCA, 0x91, 0xD3, 0x8D, 0xC1, 0x1A, 0x8D }, asf_read_unknown, 1 },
{ "Mutex Language", { 0xD6, 0xE2, 0x2A, 0x00, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
{ "Mutex Bitrate", { 0xD6, 0xE2, 0x2A, 0x01, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
{ "Mutex Unknown", { 0xD6, 0xE2, 0x2A, 0x02, 0x25, 0xDA, 0x11, 0xD1, 0x90, 0x34, 0x00, 0xA0, 0xC9, 0x03, 0x49, 0xBE }, asf_read_unknown, 1 },
{ "Bandwidth Sharing Exclusive", { 0xAF, 0x60, 0x60, 0xAA, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
{ "Bandwidth Sharing Partial", { 0xAF, 0x60, 0x60, 0xAB, 0x51, 0x97, 0x11, 0xD2, 0xB6, 0xAF, 0x00, 0xC0, 0x4F, 0xD9, 0x08, 0xE9 }, asf_read_unknown, 1 },
{ "Payload Extension System Timecode", { 0x39, 0x95, 0x95, 0xEC, 0x86, 0x67, 0x4E, 0x2D, 0x8F, 0xDB, 0x98, 0x81, 0x4C, 0xE7, 0x6C, 0x1E }, asf_read_unknown, 1 },
{ "Payload Extension System File Name", { 0xE1, 0x65, 0xEC, 0x0E, 0x19, 0xED, 0x45, 0xD7, 0xB4, 0xA7, 0x25, 0xCB, 0xD1, 0xE2, 0x8E, 0x9B }, asf_read_unknown, 1 },
{ "Payload Extension System Content Type", { 0xD5, 0x90, 0xDC, 0x20, 0x07, 0xBC, 0x43, 0x6C, 0x9C, 0xF7, 0xF3, 0xBB, 0xFB, 0xF1, 0xA4, 0xDC }, asf_read_unknown, 1 },
{ "Payload Extension System Pixel Aspect Ratio", { 0x1, 0x1E, 0xE5, 0x54, 0xF9, 0xEA, 0x4B, 0xC8, 0x82, 0x1A, 0x37, 0x6B, 0x74, 0xE4, 0xC4, 0xB8 }, asf_read_unknown, 1 },
{ "Payload Extension System Sample Duration", { 0xC6, 0xBD, 0x94, 0x50, 0x86, 0x7F, 0x49, 0x07, 0x83, 0xA3, 0xC7, 0x79, 0x21, 0xB7, 0x33, 0xAD }, asf_read_unknown, 1 },
{ "Payload Extension System Encryption Sample ID", { 0x66, 0x98, 0xB8, 0x4E, 0x0A, 0xFA, 0x43, 0x30, 0xAE, 0xB2, 0x1C, 0x0A, 0x98, 0xD7, 0xA4, 0x4D }, asf_read_unknown, 1 },
{ "Payload Extension System Degradable JPEG", { 0x00, 0xE1, 0xAF, 0x06, 0x7B, 0xEC, 0x11, 0xD1, 0xA5, 0x82, 0x00, 0xC0, 0x4F, 0xC2, 0x9C, 0xFB }, asf_read_unknown, 1 },
};
#define READ_LEN(flag, name, len) \
do { \
if ((flag) == name ## IS_BYTE) \
len = avio_r8(pb); \
else if ((flag) == name ## IS_WORD) \
len = avio_rl16(pb); \
else if ((flag) == name ## IS_DWORD) \
len = avio_rl32(pb); \
else \
len = 0; \
} while(0)
static int asf_read_subpayload(AVFormatContext *s, AVPacket *pkt, int is_header)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint8_t sub_len;
int ret, i;
if (is_header) {
asf->dts_delta = avio_r8(pb);
if (asf->nb_mult_left) {
asf->mult_sub_len = avio_rl16(pb); // total
}
asf->sub_header_offset = avio_tell(pb);
asf->nb_sub = 0;
asf->sub_left = 1;
}
sub_len = avio_r8(pb);
if ((ret = av_get_packet(pb, pkt, sub_len)) < 0) // each subpayload is entire frame
return ret;
for (i = 0; i < asf->nb_streams; i++) {
if (asf->stream_index == asf->asf_st[i]->stream_index) {
pkt->stream_index = asf->asf_st[i]->index;
break;
}
}
asf->return_subpayload = 1;
if (!sub_len)
asf->return_subpayload = 0;
if (sub_len)
asf->nb_sub++;
pkt->dts = asf->sub_dts + (asf->nb_sub - 1) * asf->dts_delta - asf->preroll;
if (asf->nb_mult_left && (avio_tell(pb) >=
(asf->sub_header_offset + asf->mult_sub_len))) {
asf->sub_left = 0;
asf->nb_mult_left--;
}
if (avio_tell(pb) >= asf->packet_offset + asf->packet_size - asf->pad_len) {
asf->sub_left = 0;
if (!asf->nb_mult_left) {
avio_skip(pb, asf->pad_len);
if (avio_tell(pb) != asf->packet_offset + asf->packet_size) {
if (!asf->packet_size)
return AVERROR_INVALIDDATA;
av_log(s, AV_LOG_WARNING,
"Position %"PRId64" wrong, should be %"PRId64"\n",
avio_tell(pb), asf->packet_offset + asf->packet_size);
avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
}
}
}
return 0;
}
static void reset_packet(ASFPacket *asf_pkt)
{
asf_pkt->size_left = 0;
asf_pkt->data_size = 0;
asf_pkt->duration = 0;
asf_pkt->flags = 0;
asf_pkt->dts = 0;
av_packet_unref(asf_pkt->avpkt);
}
static int asf_read_replicated_data(AVFormatContext *s, ASFPacket *asf_pkt)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int ret, data_size;
if (!asf_pkt->data_size) {
data_size = avio_rl32(pb); // read media object size
if (data_size <= 0)
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(asf_pkt->avpkt, data_size)) < 0)
return ret;
asf_pkt->data_size = asf_pkt->size_left = data_size;
} else
avio_skip(pb, 4); // reading of media object size is already done
asf_pkt->dts = avio_rl32(pb); // read presentation time
if (asf->rep_data_len >= 8)
avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
return 0;
}
static int asf_read_multiple_payload(AVFormatContext *s, AVPacket *pkt,
ASFPacket *asf_pkt)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint16_t pay_len;
unsigned char *p;
int ret;
int skip = 0;
// if replicated length is 1, subpayloads are present
if (asf->rep_data_len == 1) {
asf->sub_left = 1;
asf->state = READ_MULTI_SUB;
pkt->flags = asf_pkt->flags;
if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
return ret;
} else {
if (asf->rep_data_len)
if ((ret = asf_read_replicated_data(s, asf_pkt)) < 0)
return ret;
pay_len = avio_rl16(pb); // payload length should be WORD
if (pay_len > asf->packet_size) {
av_log(s, AV_LOG_ERROR,
"Error: invalid data packet size, pay_len %"PRIu16", "
"asf->packet_size %"PRIu32", offset %"PRId64".\n",
pay_len, asf->packet_size, avio_tell(pb));
return AVERROR_INVALIDDATA;
}
p = asf_pkt->avpkt->data + asf_pkt->data_size - asf_pkt->size_left;
if (pay_len > asf_pkt->size_left) {
av_log(s, AV_LOG_ERROR,
"Error: invalid buffer size, pay_len %d, data size left %d.\n",
pay_len, asf_pkt->size_left);
skip = pay_len - asf_pkt->size_left;
pay_len = asf_pkt->size_left;
}
if (asf_pkt->size_left <= 0)
return AVERROR_INVALIDDATA;
if ((ret = avio_read(pb, p, pay_len)) < 0)
return ret;
if (s->key && s->keylen == 20)
ff_asfcrypt_dec(s->key, p, ret);
avio_skip(pb, skip);
asf_pkt->size_left -= pay_len;
asf->nb_mult_left--;
}
return 0;
}
static int asf_read_single_payload(AVFormatContext *s, ASFPacket *asf_pkt)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int64_t offset;
uint64_t size;
unsigned char *p;
int ret, data_size;
if (!asf_pkt->data_size) {
data_size = avio_rl32(pb); // read media object size
if (data_size <= 0)
return AVERROR_EOF;
if ((ret = av_new_packet(asf_pkt->avpkt, data_size)) < 0)
return ret;
asf_pkt->data_size = asf_pkt->size_left = data_size;
} else
avio_skip(pb, 4); // skip media object size
asf_pkt->dts = avio_rl32(pb); // read presentation time
if (asf->rep_data_len >= 8)
avio_skip(pb, asf->rep_data_len - 8); // skip replicated data
offset = avio_tell(pb);
// size of the payload - size of the packet without header and padding
if (asf->packet_size_internal)
size = asf->packet_size_internal - offset + asf->packet_offset - asf->pad_len;
else
size = asf->packet_size - offset + asf->packet_offset - asf->pad_len;
if (size > asf->packet_size) {
av_log(s, AV_LOG_ERROR,
"Error: invalid data packet size, offset %"PRId64".\n",
avio_tell(pb));
return AVERROR_INVALIDDATA;
}
p = asf_pkt->avpkt->data + asf_pkt->data_size - asf_pkt->size_left;
if (size > asf_pkt->size_left || asf_pkt->size_left <= 0)
return AVERROR_INVALIDDATA;
if (asf_pkt->size_left > size)
asf_pkt->size_left -= size;
else
asf_pkt->size_left = 0;
if ((ret = avio_read(pb, p, size)) < 0)
return ret;
if (s->key && s->keylen == 20)
ff_asfcrypt_dec(s->key, p, ret);
if (asf->packet_size_internal)
avio_skip(pb, asf->packet_size - asf->packet_size_internal);
avio_skip(pb, asf->pad_len); // skip padding
return 0;
}
static int asf_read_payload(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int ret, i;
ASFPacket *asf_pkt = NULL;
if (!asf->sub_left) {
uint32_t off_len, media_len;
uint8_t stream_num;
stream_num = avio_r8(pb);
asf->stream_index = stream_num & ASF_STREAM_NUM;
for (i = 0; i < asf->nb_streams; i++) {
if (asf->stream_index == asf->asf_st[i]->stream_index) {
asf_pkt = &asf->asf_st[i]->pkt;
asf_pkt->stream_index = asf->asf_st[i]->index;
break;
}
}
if (!asf_pkt) {
if (asf->packet_offset + asf->packet_size <= asf->data_offset + asf->data_size) {
if (!asf->packet_size) {
av_log(s, AV_LOG_ERROR, "Invalid packet size 0.\n");
return AVERROR_INVALIDDATA;
}
avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
av_log(s, AV_LOG_WARNING, "Skipping the stream with the invalid stream index %d.\n",
asf->stream_index);
return AVERROR(EAGAIN);
} else
return AVERROR_INVALIDDATA;
}
if (stream_num >> 7)
asf_pkt->flags |= AV_PKT_FLAG_KEY;
READ_LEN(asf->prop_flags & ASF_PL_MASK_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_SIZE,
ASF_PL_FLAG_MEDIA_OBJECT_NUMBER_LENGTH_FIELD_, media_len);
READ_LEN(asf->prop_flags & ASF_PL_MASK_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_SIZE,
ASF_PL_FLAG_OFFSET_INTO_MEDIA_OBJECT_LENGTH_FIELD_, off_len);
READ_LEN(asf->prop_flags & ASF_PL_MASK_REPLICATED_DATA_LENGTH_FIELD_SIZE,
ASF_PL_FLAG_REPLICATED_DATA_LENGTH_FIELD_, asf->rep_data_len);
if (asf_pkt->size_left && (asf_pkt->frame_num != media_len)) {
av_log(s, AV_LOG_WARNING, "Unfinished frame will be ignored\n");
reset_packet(asf_pkt);
}
asf_pkt->frame_num = media_len;
asf->sub_dts = off_len;
if (asf->nb_mult_left) {
if ((ret = asf_read_multiple_payload(s, pkt, asf_pkt)) < 0)
return ret;
} else if (asf->rep_data_len == 1) {
asf->sub_left = 1;
asf->state = READ_SINGLE;
pkt->flags = asf_pkt->flags;
if ((ret = asf_read_subpayload(s, pkt, 1)) < 0)
return ret;
} else {
if ((ret = asf_read_single_payload(s, asf_pkt)) < 0)
return ret;
}
} else {
for (i = 0; i <= asf->nb_streams; i++) {
if (asf->stream_index == asf->asf_st[i]->stream_index) {
asf_pkt = &asf->asf_st[i]->pkt;
break;
}
}
if (!asf_pkt)
return AVERROR_INVALIDDATA;
pkt->flags = asf_pkt->flags;
pkt->dts = asf_pkt->dts;
pkt->stream_index = asf->asf_st[i]->index;
if ((ret = asf_read_subpayload(s, pkt, 0)) < 0) // read subpayload without its header
return ret;
}
return 0;
}
static int asf_read_packet_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
uint64_t size;
uint32_t av_unused seq;
unsigned char error_flags, len_flags, pay_flags;
asf->packet_offset = avio_tell(pb);
error_flags = avio_r8(pb); // read Error Correction Flags
if (error_flags & ASF_PACKET_FLAG_ERROR_CORRECTION_PRESENT) {
if (!(error_flags & ASF_ERROR_CORRECTION_LENGTH_TYPE)) {
size = error_flags & ASF_PACKET_ERROR_CORRECTION_DATA_SIZE;
avio_skip(pb, size);
}
len_flags = avio_r8(pb);
} else
len_flags = error_flags;
asf->prop_flags = avio_r8(pb);
READ_LEN(len_flags & ASF_PPI_MASK_PACKET_LENGTH_FIELD_SIZE,
ASF_PPI_FLAG_PACKET_LENGTH_FIELD_, asf->packet_size_internal);
READ_LEN(len_flags & ASF_PPI_MASK_SEQUENCE_FIELD_SIZE,
ASF_PPI_FLAG_SEQUENCE_FIELD_, seq);
READ_LEN(len_flags & ASF_PPI_MASK_PADDING_LENGTH_FIELD_SIZE,
ASF_PPI_FLAG_PADDING_LENGTH_FIELD_, asf->pad_len );
asf->send_time = avio_rl32(pb); // send time
avio_skip(pb, 2); // skip duration
if (len_flags & ASF_PPI_FLAG_MULTIPLE_PAYLOADS_PRESENT) { // Multiple Payloads present
pay_flags = avio_r8(pb);
asf->nb_mult_left = (pay_flags & ASF_NUM_OF_PAYLOADS);
}
return 0;
}
static int asf_deinterleave(AVFormatContext *s, ASFPacket *asf_pkt, int st_num)
{
ASFContext *asf = s->priv_data;
ASFStream *asf_st = asf->asf_st[st_num];
unsigned char *p = asf_pkt->avpkt->data;
uint16_t pkt_len = asf->asf_st[st_num]->virtual_pkt_len;
uint16_t chunk_len = asf->asf_st[st_num]->virtual_chunk_len;
int nchunks = pkt_len / chunk_len;
uint8_t *data;
int pos = 0, j, l, ret;
data = av_malloc(asf_pkt->data_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return AVERROR(ENOMEM);
memset(data + asf_pkt->data_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
while (asf_pkt->data_size >= asf_st->span * pkt_len + pos) {
if (pos >= asf_pkt->data_size) {
break;
}
for (l = 0; l < pkt_len; l++) {
if (pos >= asf_pkt->data_size) {
break;
}
for (j = 0; j < asf_st->span; j++) {
if ((pos + chunk_len) >= asf_pkt->data_size)
break;
memcpy(data + pos,
p + (j * nchunks + l) * chunk_len,
chunk_len);
pos += chunk_len;
}
}
p += asf_st->span * pkt_len;
if (p > asf_pkt->avpkt->data + asf_pkt->data_size)
break;
}
av_packet_unref(asf_pkt->avpkt);
ret = av_packet_from_data(asf_pkt->avpkt, data, asf_pkt->data_size);
if (ret < 0)
av_free(data);
return ret;
}
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
int ret, i;
if ((avio_tell(pb) >= asf->data_offset + asf->data_size) &&
!(asf->b_flags & ASF_FLAG_BROADCAST))
return AVERROR_EOF;
while (!pb->eof_reached) {
if (asf->state == PARSE_PACKET_HEADER) {
asf_read_packet_header(s);
if (pb->eof_reached)
break;
if (!asf->nb_mult_left)
asf->state = READ_SINGLE;
else
asf->state = READ_MULTI;
}
ret = asf_read_payload(s, pkt);
if (ret == AVERROR(EAGAIN)) {
asf->state = PARSE_PACKET_HEADER;
continue;
}
else if (ret < 0)
return ret;
switch (asf->state) {
case READ_SINGLE:
if (!asf->sub_left)
asf->state = PARSE_PACKET_HEADER;
break;
case READ_MULTI_SUB:
if (!asf->sub_left && !asf->nb_mult_left) {
asf->state = PARSE_PACKET_HEADER;
if (!asf->return_subpayload &&
(avio_tell(pb) <= asf->packet_offset +
asf->packet_size - asf->pad_len))
avio_skip(pb, asf->pad_len); // skip padding
if (asf->packet_offset + asf->packet_size > avio_tell(pb))
avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
} else if (!asf->sub_left)
asf->state = READ_MULTI;
break;
case READ_MULTI:
if (!asf->nb_mult_left) {
asf->state = PARSE_PACKET_HEADER;
if (!asf->return_subpayload &&
(avio_tell(pb) <= asf->packet_offset +
asf->packet_size - asf->pad_len))
avio_skip(pb, asf->pad_len); // skip padding
if (asf->packet_offset + asf->packet_size > avio_tell(pb))
avio_seek(pb, asf->packet_offset + asf->packet_size, SEEK_SET);
}
break;
}
if (asf->return_subpayload) {
asf->return_subpayload = 0;
return 0;
}
for (i = 0; i < asf->nb_streams; i++) {
ASFPacket *asf_pkt = &asf->asf_st[i]->pkt;
if (asf_pkt && !asf_pkt->size_left && asf_pkt->data_size) {
if (asf->asf_st[i]->span > 1 &&
asf->asf_st[i]->type == AVMEDIA_TYPE_AUDIO)
if ((ret = asf_deinterleave(s, asf_pkt, i)) < 0)
return ret;
av_packet_move_ref(pkt, asf_pkt->avpkt);
pkt->stream_index = asf->asf_st[i]->index;
pkt->flags = asf_pkt->flags;
pkt->dts = asf_pkt->dts - asf->preroll;
asf_pkt->data_size = 0;
asf_pkt->frame_num = 0;
return 0;
}
}
}
if (pb->eof_reached)
return AVERROR_EOF;
return 0;
}
static int asf_read_close(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
int i;
for (i = 0; i < ASF_MAX_STREAMS; i++) {
av_dict_free(&asf->asf_sd[i].asf_met);
if (i < asf->nb_streams) {
av_packet_free(&asf->asf_st[i]->pkt.avpkt);
av_freep(&asf->asf_st[i]);
}
}
asf->nb_streams = 0;
return 0;
}
static void reset_packet_state(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
int i;
asf->state = PARSE_PACKET_HEADER;
asf->offset = 0;
asf->return_subpayload = 0;
asf->sub_left = 0;
asf->sub_header_offset = 0;
asf->packet_offset = asf->first_packet_offset;
asf->pad_len = 0;
asf->rep_data_len = 0;
asf->dts_delta = 0;
asf->mult_sub_len = 0;
asf->nb_mult_left = 0;
asf->nb_sub = 0;
asf->prop_flags = 0;
asf->sub_dts = 0;
for (i = 0; i < asf->nb_streams; i++) {
ASFPacket *pkt = &asf->asf_st[i]->pkt;
reset_packet(pkt);
}
}
/*
* Find a timestamp for the requested position within the payload
* where the pos (position) is the offset inside the Data Object.
* When position is not on the packet boundary, asf_read_timestamp tries
* to find the closest packet offset after this position. If this packet
* is a key frame, this packet timestamp is read and an index entry is created
* for the packet. If this packet belongs to the requested stream,
* asf_read_timestamp upgrades pos to the packet beginning offset and
* returns this packet's dts. So returned dts is the dts of the first key frame with
* matching stream number after given position.
*/
static int64_t asf_read_timestamp(AVFormatContext *s, int stream_index,
int64_t *pos, int64_t pos_limit)
{
ASFContext *asf = s->priv_data;
int64_t pkt_pos = *pos, pkt_offset, dts = AV_NOPTS_VALUE, data_end;
AVPacket *pkt = av_packet_alloc();
int n;
if (!pkt)
return AVERROR(ENOMEM);
data_end = asf->data_offset + asf->data_size;
n = (pkt_pos - asf->first_packet_offset + asf->packet_size - 1) /
asf->packet_size;
n = av_clip(n, 0, ((data_end - asf->first_packet_offset) / asf->packet_size - 1));
pkt_pos = asf->first_packet_offset + n * asf->packet_size;
avio_seek(s->pb, pkt_pos, SEEK_SET);
pkt_offset = pkt_pos;
reset_packet_state(s);
while (avio_tell(s->pb) < data_end) {
int i, ret, st_found;
pkt_offset = avio_tell(s->pb);
if ((ret = asf_read_packet(s, pkt)) < 0) {
av_packet_free(&pkt);
dts = AV_NOPTS_VALUE;
return ret;
}
// ASFPacket may contain fragments of packets belonging to different streams,
// pkt_offset is the offset of the first fragment within it.
if ((pkt_offset >= (pkt_pos + asf->packet_size)))
pkt_pos += asf->packet_size;
for (i = 0; i < asf->nb_streams; i++) {
ASFStream *st = asf->asf_st[i];
st_found = 0;
if (pkt->flags & AV_PKT_FLAG_KEY) {
dts = pkt->dts;
if (dts) {
av_add_index_entry(s->streams[pkt->stream_index], pkt_pos,
dts, pkt->size, 0, AVINDEX_KEYFRAME);
if (stream_index == st->index) {
st_found = 1;
break;
}
}
}
}
if (st_found)
break;
av_packet_unref(pkt);
}
*pos = pkt_pos;
av_packet_free(&pkt);
return dts;
}
static int asf_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
ASFContext *asf = s->priv_data;
AVStream *const st = s->streams[stream_index];
FFStream *const sti = ffstream(st);
int idx, ret;
if (sti->nb_index_entries && asf->is_simple_index) {
idx = av_index_search_timestamp(st, timestamp, flags);
if (idx < 0 || idx >= sti->nb_index_entries)
return AVERROR_INVALIDDATA;
avio_seek(s->pb, sti->index_entries[idx].pos, SEEK_SET);
} else {
if ((ret = ff_seek_frame_binary(s, stream_index, timestamp, flags)) < 0)
return ret;
}
reset_packet_state(s);
return 0;
}
static const GUIDParseTable *find_guid(ff_asf_guid guid)
{
int j, ret;
const GUIDParseTable *g;
swap_guid(guid);
g = gdef;
for (j = 0; j < FF_ARRAY_ELEMS(gdef); j++) {
if (!(ret = memcmp(guid, g->guid, sizeof(g->guid))))
return g;
g++;
}
return NULL;
}
static int detect_unknown_subobject(AVFormatContext *s, int64_t offset, int64_t size)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
const GUIDParseTable *g = NULL;
ff_asf_guid guid;
int ret;
if (offset > INT64_MAX - size)
return AVERROR_INVALIDDATA;
while (avio_tell(pb) <= offset + size) {
if (avio_tell(pb) == asf->offset)
break;
asf->offset = avio_tell(pb);
if ((ret = ff_get_guid(pb, &guid)) < 0)
return ret;
g = find_guid(guid);
if (g) {
if ((ret = g->read_object(s, g)) < 0)
return ret;
} else {
GUIDParseTable g2;
g2.name = "Unknown";
g2.is_subobject = 1;
asf_read_unknown(s, &g2);
}
}
return 0;
}
static int asf_read_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
const GUIDParseTable *g = NULL;
ff_asf_guid guid;
int i, ret;
uint64_t size;
asf->preroll = 0;
asf->is_simple_index = 0;
ff_get_guid(pb, &guid);
if (ff_guidcmp(&guid, &ff_asf_header))
return AVERROR_INVALIDDATA;
avio_skip(pb, 8); // skip header object size
avio_skip(pb, 6); // skip number of header objects and 2 reserved bytes
asf->data_reached = 0;
/* 1 is here instead of pb->eof_reached because (when not streaming), Data are skipped
* for the first time,
* Index object is processed and got eof and then seeking back to the Data is performed.
*/
while (1) {
// for the cases when object size is invalid
if (avio_tell(pb) == asf->offset)
break;
asf->offset = avio_tell(pb);
if ((ret = ff_get_guid(pb, &guid)) < 0) {
if (ret == AVERROR_EOF && asf->data_reached)
break;
else
goto failed;
}
g = find_guid(guid);
if (g) {
asf->unknown_offset = asf->offset;
asf->is_header = 1;
if ((ret = g->read_object(s, g)) < 0)
goto failed;
} else {
size = avio_rl64(pb);
align_position(pb, asf->offset, size);
}
if (asf->data_reached &&
(!(pb->seekable & AVIO_SEEKABLE_NORMAL) ||
(asf->b_flags & ASF_FLAG_BROADCAST)))
break;
}
if (!asf->data_reached) {
av_log(s, AV_LOG_ERROR, "Data Object was not found.\n");
ret = AVERROR_INVALIDDATA;
goto failed;
}
if (pb->seekable & AVIO_SEEKABLE_NORMAL)
avio_seek(pb, asf->first_packet_offset, SEEK_SET);
for (i = 0; i < asf->nb_streams; i++) {
const char *rfc1766 = asf->asf_sd[asf->asf_st[i]->lang_idx].langs;
AVStream *st = s->streams[asf->asf_st[i]->index];
set_language(s, rfc1766, &st->metadata);
}
for (i = 0; i < ASF_MAX_STREAMS; i++) {
AVStream *st = NULL;
st = find_stream(s, i);
if (st) {
av_dict_copy(&st->metadata, asf->asf_sd[i].asf_met, AV_DICT_IGNORE_SUFFIX);
if (asf->asf_sd[i].aspect_ratio.num > 0 && asf->asf_sd[i].aspect_ratio.den > 0) {
st->sample_aspect_ratio.num = asf->asf_sd[i].aspect_ratio.num;
st->sample_aspect_ratio.den = asf->asf_sd[i].aspect_ratio.den;
}
}
}
return 0;
failed:
asf_read_close(s);
return ret;
}
const AVInputFormat ff_asf_o_demuxer = {
.name = "asf_o",
.long_name = NULL_IF_CONFIG_SMALL("ASF (Advanced / Active Streaming Format)"),
.priv_data_size = sizeof(ASFContext),
.read_probe = asf_probe,
.read_header = asf_read_header,
.read_packet = asf_read_packet,
.read_close = asf_read_close,
.read_timestamp = asf_read_timestamp,
.read_seek = asf_read_seek,
.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
};
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