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asfdec_f.c
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/*
* ASF compatible demuxer
* 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 <inttypes.h>
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/avstring.h"
#include "libavutil/bswap.h"
#include "libavutil/common.h"
#include "libavutil/dict.h"
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "avio_internal.h"
#include "avlanguage.h"
#include "demux.h"
#include "internal.h"
#include "riff.h"
#include "asf.h"
#include "asfcrypt.h"
typedef struct ASFPayload {
uint8_t type;
uint16_t size;
} ASFPayload;
typedef struct ASFStream {
int num;
unsigned char seq;
/* use for reading */
AVPacket pkt;
int frag_offset;
int packet_obj_size;
int timestamp;
int64_t duration;
int skip_to_key;
int pkt_clean;
int ds_span; /* descrambling */
int ds_packet_size;
int ds_chunk_size;
int64_t packet_pos;
uint16_t stream_language_index;
int palette_changed;
uint32_t palette[256];
int payload_ext_ct;
ASFPayload payload[8];
} ASFStream;
typedef struct ASFContext {
const AVClass *class;
int asfid2avid[128]; ///< conversion table from asf ID 2 AVStream ID
ASFStream streams[128]; ///< it's max number and it's not that big
uint32_t stream_bitrates[128]; ///< max number of streams, bitrate for each (for streaming)
AVRational dar[128];
char stream_languages[128][6]; ///< max number of streams, language for each (RFC1766, e.g. en-US)
/* non streamed additonnal info */
/* packet filling */
int packet_size_left;
/* only for reading */
uint64_t data_offset; ///< beginning of the first data packet
uint64_t data_object_offset; ///< data object offset (excl. GUID & size)
uint64_t data_object_size; ///< size of the data object
int index_read;
ASFMainHeader hdr;
int packet_flags;
int packet_property;
int packet_timestamp;
int packet_segsizetype;
int packet_segments;
int packet_seq;
int packet_replic_size;
int packet_key_frame;
int packet_padsize;
unsigned int packet_frag_offset;
unsigned int packet_frag_size;
int64_t packet_frag_timestamp;
int ts_is_pts;
int packet_multi_size;
int packet_time_delta;
int64_t packet_time_start;
int64_t packet_pos;
int stream_index;
ASFStream *asf_st; ///< currently decoded stream
int no_resync_search;
int export_xmp;
int uses_std_ecc;
} ASFContext;
static const AVOption options[] = {
{ "no_resync_search", "Don't try to resynchronize by looking for a certain optional start code", offsetof(ASFContext, no_resync_search), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "export_xmp", "Export full XMP metadata", offsetof(ASFContext, export_xmp), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ NULL },
};
static const AVClass asf_class = {
.class_name = "asf demuxer",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
#undef NDEBUG
#include <assert.h>
#define ASF_MAX_STREAMS 127
#define FRAME_HEADER_SIZE 6
// Fix Me! FRAME_HEADER_SIZE may be different.
// (7 is known to be too large for GipsyGuitar.wmv)
#ifdef DEBUG
static const ff_asf_guid stream_bitrate_guid = { /* (http://get.to/sdp) */
0xce, 0x75, 0xf8, 0x7b, 0x8d, 0x46, 0xd1, 0x11, 0x8d, 0x82, 0x00, 0x60, 0x97, 0xc9, 0xa2, 0xb2
};
static const ff_asf_guid asf_audio_conceal_none = {
// 0x40, 0xa4, 0xf1, 0x49, 0x4ece, 0x11d0, 0xa3, 0xac, 0x00, 0xa0, 0xc9, 0x03, 0x48, 0xf6
// New value lifted from avifile
0x00, 0x57, 0xfb, 0x20, 0x55, 0x5B, 0xCF, 0x11, 0xa8, 0xfd, 0x00, 0x80, 0x5f, 0x5c, 0x44, 0x2b
};
#define PRINT_IF_GUID(g, cmp) \
if (!ff_guidcmp(g, &(cmp))) \
av_log(NULL, AV_LOG_TRACE, "(GUID: %s) ", # cmp)
static void print_guid(ff_asf_guid *g)
{
int i;
PRINT_IF_GUID(g, ff_asf_header);
else PRINT_IF_GUID(g, ff_asf_file_header);
else PRINT_IF_GUID(g, ff_asf_stream_header);
else PRINT_IF_GUID(g, ff_asf_audio_stream);
else PRINT_IF_GUID(g, asf_audio_conceal_none);
else PRINT_IF_GUID(g, ff_asf_video_stream);
else PRINT_IF_GUID(g, ff_asf_video_conceal_none);
else PRINT_IF_GUID(g, ff_asf_command_stream);
else PRINT_IF_GUID(g, ff_asf_comment_header);
else PRINT_IF_GUID(g, ff_asf_codec_comment_header);
else PRINT_IF_GUID(g, ff_asf_codec_comment1_header);
else PRINT_IF_GUID(g, ff_asf_data_header);
else PRINT_IF_GUID(g, ff_asf_simple_index_header);
else PRINT_IF_GUID(g, ff_asf_head1_guid);
else PRINT_IF_GUID(g, ff_asf_head2_guid);
else PRINT_IF_GUID(g, ff_asf_my_guid);
else PRINT_IF_GUID(g, ff_asf_ext_stream_header);
else PRINT_IF_GUID(g, ff_asf_extended_content_header);
else PRINT_IF_GUID(g, ff_asf_ext_stream_embed_stream_header);
else PRINT_IF_GUID(g, ff_asf_ext_stream_audio_stream);
else PRINT_IF_GUID(g, ff_asf_metadata_header);
else PRINT_IF_GUID(g, ff_asf_metadata_library_header);
else PRINT_IF_GUID(g, ff_asf_marker_header);
else PRINT_IF_GUID(g, stream_bitrate_guid);
else PRINT_IF_GUID(g, ff_asf_language_guid);
else
av_log(NULL, AV_LOG_TRACE, "(GUID: unknown) ");
for (i = 0; i < 16; i++)
av_log(NULL, AV_LOG_TRACE, " 0x%02x,", (*g)[i]);
av_log(NULL, AV_LOG_TRACE, "}\n");
}
#undef PRINT_IF_GUID
#else
#define print_guid(g) while(0)
#endif
static int asf_probe(const AVProbeData *pd)
{
/* check file header */
if (!ff_guidcmp(pd->buf, &ff_asf_header))
return AVPROBE_SCORE_MAX;
else
return 0;
}
/* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"
* but 16 bit for "Metadata Object" and "Metadata Library Object" */
static int get_value(AVIOContext *pb, int type, int type2_size)
{
switch (type) {
case ASF_BOOL:
return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
case ASF_DWORD:
return avio_rl32(pb);
case ASF_QWORD:
return avio_rl64(pb);
case ASF_WORD:
return avio_rl16(pb);
default:
return INT_MIN;
}
}
static void get_tag(AVFormatContext *s, const char *key, int type, int len, int type2_size)
{
ASFContext *asf = s->priv_data;
char *value = NULL;
int64_t off = avio_tell(s->pb);
#define LEN 22
av_assert0((unsigned)len < (INT_MAX - LEN) / 2);
if (!asf->export_xmp && !strncmp(key, "xmp", 3))
goto finish;
value = av_malloc(2 * len + LEN);
if (!value)
goto finish;
switch (type) {
case ASF_UNICODE:
avio_get_str16le(s->pb, len, value, 2 * len + 1);
break;
case -1: // ASCI
avio_read(s->pb, value, len);
value[len]=0;
break;
case ASF_BYTE_ARRAY:
if (ff_asf_handle_byte_array(s, key, len) > 0)
av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
goto finish;
case ASF_BOOL:
case ASF_DWORD:
case ASF_QWORD:
case ASF_WORD: {
uint64_t num = get_value(s->pb, type, type2_size);
snprintf(value, LEN, "%"PRIu64, num);
break;
}
case ASF_GUID:
av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
goto finish;
default:
av_log(s, AV_LOG_DEBUG,
"Unsupported value type %d in tag %s.\n", type, key);
goto finish;
}
if (*value)
av_dict_set(&s->metadata, key, value, 0);
finish:
av_freep(&value);
avio_seek(s->pb, off + len, SEEK_SET);
}
static int asf_read_file_properties(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
ff_get_guid(pb, &asf->hdr.guid);
asf->hdr.file_size = avio_rl64(pb);
asf->hdr.create_time = avio_rl64(pb);
avio_rl64(pb); /* number of packets */
asf->hdr.play_time = avio_rl64(pb);
asf->hdr.send_time = avio_rl64(pb);
asf->hdr.preroll = avio_rl32(pb);
asf->hdr.ignore = avio_rl32(pb);
asf->hdr.flags = avio_rl32(pb);
asf->hdr.min_pktsize = avio_rl32(pb);
asf->hdr.max_pktsize = avio_rl32(pb);
if (asf->hdr.min_pktsize >= (1U << 29))
return AVERROR_INVALIDDATA;
asf->hdr.max_bitrate = avio_rl32(pb);
s->packet_size = asf->hdr.max_pktsize;
return 0;
}
static int asf_read_stream_properties(AVFormatContext *s, int64_t size)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st;
FFStream *sti;
ASFStream *asf_st;
ff_asf_guid g;
enum AVMediaType type;
int type_specific_size, sizeX;
unsigned int tag1;
int64_t pos1, pos2, start_time;
int test_for_ext_stream_audio, is_dvr_ms_audio = 0;
if (s->nb_streams == ASF_MAX_STREAMS) {
av_log(s, AV_LOG_ERROR, "too many streams\n");
return AVERROR(EINVAL);
}
pos1 = avio_tell(pb);
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
sti = ffstream(st);
avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
start_time = asf->hdr.preroll;
if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
int64_t fsize = avio_size(pb);
if (fsize <= 0 || (int64_t)asf->hdr.file_size <= 0 ||
FFABS(fsize - (int64_t)asf->hdr.file_size) < FFMIN(fsize, asf->hdr.file_size)/20)
st->duration = asf->hdr.play_time /
(10000000 / 1000) - start_time;
}
ff_get_guid(pb, &g);
test_for_ext_stream_audio = 0;
if (!ff_guidcmp(&g, &ff_asf_audio_stream)) {
type = AVMEDIA_TYPE_AUDIO;
} else if (!ff_guidcmp(&g, &ff_asf_video_stream)) {
type = AVMEDIA_TYPE_VIDEO;
} else if (!ff_guidcmp(&g, &ff_asf_jfif_media)) {
type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_MJPEG;
} else if (!ff_guidcmp(&g, &ff_asf_command_stream)) {
type = AVMEDIA_TYPE_DATA;
} else if (!ff_guidcmp(&g, &ff_asf_ext_stream_embed_stream_header)) {
test_for_ext_stream_audio = 1;
type = AVMEDIA_TYPE_UNKNOWN;
} else {
return -1;
}
ff_get_guid(pb, &g);
avio_skip(pb, 8); /* total_size */
type_specific_size = avio_rl32(pb);
avio_rl32(pb);
st->id = avio_rl16(pb) & 0x7f; /* stream id */
// mapping of asf ID to AV stream ID;
asf->asfid2avid[st->id] = s->nb_streams - 1;
asf_st = &asf->streams[st->id];
avio_rl32(pb);
if (test_for_ext_stream_audio) {
ff_get_guid(pb, &g);
if (!ff_guidcmp(&g, &ff_asf_ext_stream_audio_stream)) {
type = AVMEDIA_TYPE_AUDIO;
is_dvr_ms_audio = 1;
ff_get_guid(pb, &g);
avio_rl32(pb);
avio_rl32(pb);
avio_rl32(pb);
ff_get_guid(pb, &g);
avio_rl32(pb);
}
}
st->codecpar->codec_type = type;
if (type == AVMEDIA_TYPE_AUDIO) {
int ret = ff_get_wav_header(s, pb, st->codecpar, type_specific_size, 0);
if (ret < 0)
return ret;
if (is_dvr_ms_audio) {
// codec_id and codec_tag are unreliable in dvr_ms
// files. Set them later by probing stream.
sti->request_probe = 1;
st->codecpar->codec_tag = 0;
}
if (st->codecpar->codec_id == AV_CODEC_ID_AAC)
sti->need_parsing = AVSTREAM_PARSE_NONE;
else
sti->need_parsing = AVSTREAM_PARSE_FULL;
/* We have to init the frame size at some point .... */
pos2 = avio_tell(pb);
if (size >= (pos2 + 8 - pos1 + 24)) {
asf_st->ds_span = avio_r8(pb);
asf_st->ds_packet_size = avio_rl16(pb);
asf_st->ds_chunk_size = avio_rl16(pb);
avio_rl16(pb); // ds_data_size
avio_r8(pb); // ds_silence_data
}
if (asf_st->ds_span > 1) {
if (!asf_st->ds_chunk_size ||
(asf_st->ds_packet_size / asf_st->ds_chunk_size <= 1) ||
asf_st->ds_packet_size % asf_st->ds_chunk_size)
asf_st->ds_span = 0; // disable descrambling
}
} else if (type == AVMEDIA_TYPE_VIDEO &&
size - (avio_tell(pb) - pos1 + 24) >= 51) {
avio_rl32(pb);
avio_rl32(pb);
avio_r8(pb);
avio_rl16(pb); /* size */
sizeX = avio_rl32(pb); /* size */
st->codecpar->width = avio_rl32(pb);
st->codecpar->height = avio_rl32(pb);
/* not available for asf */
avio_rl16(pb); /* panes */
st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
tag1 = avio_rl32(pb);
avio_skip(pb, 20);
if (sizeX > 40) {
if (size < sizeX - 40 || sizeX - 40 > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE)
return AVERROR_INVALIDDATA;
st->codecpar->extradata_size = ffio_limit(pb, sizeX - 40);
st->codecpar->extradata = av_mallocz(st->codecpar->extradata_size +
AV_INPUT_BUFFER_PADDING_SIZE);
if (!st->codecpar->extradata)
return AVERROR(ENOMEM);
avio_read(pb, st->codecpar->extradata, st->codecpar->extradata_size);
}
/* Extract palette from extradata if bpp <= 8 */
/* This code assumes that extradata contains only palette */
/* This is true for all paletted codecs implemented in libavcodec */
if (st->codecpar->extradata_size && (st->codecpar->bits_per_coded_sample <= 8)) {
#if HAVE_BIGENDIAN
int i;
for (i = 0; i < FFMIN(st->codecpar->extradata_size, AVPALETTE_SIZE) / 4; i++)
asf_st->palette[i] = av_bswap32(((uint32_t *)st->codecpar->extradata)[i]);
#else
memcpy(asf_st->palette, st->codecpar->extradata,
FFMIN(st->codecpar->extradata_size, AVPALETTE_SIZE));
#endif
asf_st->palette_changed = 1;
}
st->codecpar->codec_tag = tag1;
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
if (!st->codecpar->codec_id)
st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1);
if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
sti->need_parsing = AVSTREAM_PARSE_FULL;
/* issue658 contains wrong w/h and MS even puts a fake seq header
* with wrong w/h in extradata while a correct one is in the stream.
* maximum lameness */
st->codecpar->width =
st->codecpar->height = 0;
av_freep(&st->codecpar->extradata);
st->codecpar->extradata_size = 0;
}
if (st->codecpar->codec_id == AV_CODEC_ID_H264)
sti->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4)
sti->need_parsing = AVSTREAM_PARSE_FULL;
if (st->codecpar->codec_id == AV_CODEC_ID_HEVC)
sti->need_parsing = AVSTREAM_PARSE_FULL;
}
pos2 = avio_tell(pb);
avio_skip(pb, size - (pos2 - pos1 + 24));
return 0;
}
static int asf_read_ext_stream_properties(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
AVIOContext *pb = s->pb;
ff_asf_guid g;
int ext_len, payload_ext_ct, stream_ct, i;
uint32_t leak_rate, stream_num;
unsigned int stream_languageid_index;
avio_rl64(pb); // starttime
avio_rl64(pb); // endtime
leak_rate = avio_rl32(pb); // leak-datarate
avio_rl32(pb); // bucket-datasize
avio_rl32(pb); // init-bucket-fullness
avio_rl32(pb); // alt-leak-datarate
avio_rl32(pb); // alt-bucket-datasize
avio_rl32(pb); // alt-init-bucket-fullness
avio_rl32(pb); // max-object-size
avio_rl32(pb); // flags (reliable,seekable,no_cleanpoints?,resend-live-cleanpoints, rest of bits reserved)
stream_num = avio_rl16(pb); // stream-num
stream_languageid_index = avio_rl16(pb); // stream-language-id-index
if (stream_num < 128)
asf->streams[stream_num].stream_language_index = stream_languageid_index;
avio_rl64(pb); // avg frametime in 100ns units
stream_ct = avio_rl16(pb); // stream-name-count
payload_ext_ct = avio_rl16(pb); // payload-extension-system-count
if (stream_num < 128) {
asf->stream_bitrates[stream_num] = leak_rate;
asf->streams[stream_num].payload_ext_ct = 0;
}
for (i = 0; i < stream_ct; i++) {
avio_rl16(pb);
ext_len = avio_rl16(pb);
avio_skip(pb, ext_len);
}
for (i = 0; i < payload_ext_ct; i++) {
int size;
ff_get_guid(pb, &g);
size = avio_rl16(pb);
ext_len = avio_rl32(pb);
if (ext_len < 0)
return AVERROR_INVALIDDATA;
avio_skip(pb, ext_len);
if (stream_num < 128 && i < FF_ARRAY_ELEMS(asf->streams[stream_num].payload)) {
ASFPayload *p = &asf->streams[stream_num].payload[i];
p->type = g[0];
p->size = size;
av_log(s, AV_LOG_DEBUG, "Payload extension %x %d\n", g[0], p->size );
asf->streams[stream_num].payload_ext_ct ++;
}
}
return 0;
}
static int asf_read_content_desc(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
int len1, len2, len3, len4, len5;
len1 = avio_rl16(pb);
len2 = avio_rl16(pb);
len3 = avio_rl16(pb);
len4 = avio_rl16(pb);
len5 = avio_rl16(pb);
get_tag(s, "title", 0, len1, 32);
get_tag(s, "author", 0, len2, 32);
get_tag(s, "copyright", 0, len3, 32);
get_tag(s, "comment", 0, len4, 32);
avio_skip(pb, len5);
return 0;
}
static int asf_read_ext_content_desc(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
ASFContext *asf = s->priv_data;
int desc_count, i, ret;
desc_count = avio_rl16(pb);
for (i = 0; i < desc_count; i++) {
int name_len, value_type, value_len;
char name[1024];
name_len = avio_rl16(pb);
if (name_len % 2) // must be even, broken lavf versions wrote len-1
name_len += 1;
if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
avio_skip(pb, name_len - ret);
value_type = avio_rl16(pb);
value_len = avio_rl16(pb);
if (!value_type && value_len % 2)
value_len += 1;
/* My sample has that stream set to 0 maybe that mean the container.
* ASF stream count starts at 1. I am using 0 to the container value
* since it's unused. */
if (!strcmp(name, "AspectRatioX"))
asf->dar[0].num = get_value(s->pb, value_type, 32);
else if (!strcmp(name, "AspectRatioY"))
asf->dar[0].den = get_value(s->pb, value_type, 32);
else
get_tag(s, name, value_type, value_len, 32);
}
return 0;
}
static int asf_read_language_list(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
ASFContext *asf = s->priv_data;
int j, ret;
int stream_count = avio_rl16(pb);
for (j = 0; j < stream_count; j++) {
char lang[6];
unsigned int lang_len = avio_r8(pb);
if ((ret = avio_get_str16le(pb, lang_len, lang,
sizeof(lang))) < lang_len)
avio_skip(pb, lang_len - ret);
if (j < 128)
av_strlcpy(asf->stream_languages[j], lang,
sizeof(*asf->stream_languages));
}
return 0;
}
static int asf_read_metadata(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
ASFContext *asf = s->priv_data;
int n, stream_num, name_len_utf16, name_len_utf8, value_len;
int ret, i;
n = avio_rl16(pb);
for (i = 0; i < n; i++) {
uint8_t *name;
int value_type;
avio_rl16(pb); // lang_list_index
stream_num = avio_rl16(pb);
name_len_utf16 = avio_rl16(pb);
value_type = avio_rl16(pb); /* value_type */
value_len = avio_rl32(pb);
if (value_len < 0 || value_len > UINT16_MAX)
return AVERROR_INVALIDDATA;
name_len_utf8 = 2*name_len_utf16 + 1;
name = av_malloc(name_len_utf8);
if (!name)
return AVERROR(ENOMEM);
if ((ret = avio_get_str16le(pb, name_len_utf16, name, name_len_utf8)) < name_len_utf16)
avio_skip(pb, name_len_utf16 - ret);
av_log(s, AV_LOG_TRACE, "%d stream %d name_len %2d type %d len %4d <%s>\n",
i, stream_num, name_len_utf16, value_type, value_len, name);
if (!strcmp(name, "AspectRatioX")){
int aspect_x = get_value(s->pb, value_type, 16);
if(stream_num < 128)
asf->dar[stream_num].num = aspect_x;
} else if(!strcmp(name, "AspectRatioY")){
int aspect_y = get_value(s->pb, value_type, 16);
if(stream_num < 128)
asf->dar[stream_num].den = aspect_y;
} else {
get_tag(s, name, value_type, value_len, 16);
}
av_freep(&name);
}
return 0;
}
static int asf_read_marker(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
ASFContext *asf = s->priv_data;
int i, count, name_len, ret;
char name[1024];
avio_rl64(pb); // reserved 16 bytes
avio_rl64(pb); // ...
count = avio_rl32(pb); // markers count
avio_rl16(pb); // reserved 2 bytes
name_len = avio_rl16(pb); // name length
avio_skip(pb, name_len);
for (i = 0; i < count; i++) {
int64_t pres_time;
int name_len;
if (avio_feof(pb))
return AVERROR_INVALIDDATA;
avio_rl64(pb); // offset, 8 bytes
pres_time = avio_rl64(pb); // presentation time
pres_time = av_sat_sub64(pres_time, asf->hdr.preroll * 10000LL);
avio_rl16(pb); // entry length
avio_rl32(pb); // send time
avio_rl32(pb); // flags
name_len = avio_rl32(pb); // name length
if ((unsigned)name_len > INT_MAX / 2)
return AVERROR_INVALIDDATA;
if ((ret = avio_get_str16le(pb, name_len * 2, name,
sizeof(name))) < name_len)
avio_skip(pb, name_len - ret);
avpriv_new_chapter(s, i, (AVRational) { 1, 10000000 }, pres_time,
AV_NOPTS_VALUE, name);
}
return 0;
}
static int asf_read_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
ff_asf_guid g;
AVIOContext *pb = s->pb;
int i;
int64_t gsize;
ff_get_guid(pb, &g);
if (ff_guidcmp(&g, &ff_asf_header))
return AVERROR_INVALIDDATA;
avio_rl64(pb);
avio_rl32(pb);
avio_r8(pb);
avio_r8(pb);
memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
for (i = 0; i<128; i++)
asf->streams[i].stream_language_index = 128; // invalid stream index means no language info
for (;;) {
uint64_t gpos = avio_tell(pb);
int ret = 0;
ff_get_guid(pb, &g);
gsize = avio_rl64(pb);
print_guid(&g);
if (!ff_guidcmp(&g, &ff_asf_data_header)) {
asf->data_object_offset = avio_tell(pb);
/* If not streaming, gsize is not unlimited (how?),
* and there is enough space in the file.. */
if (!(asf->hdr.flags & 0x01) && gsize >= 100)
asf->data_object_size = gsize - 24;
else
asf->data_object_size = (uint64_t)-1;
break;
}
if (gsize < 24)
return AVERROR_INVALIDDATA;
if (!ff_guidcmp(&g, &ff_asf_file_header)) {
ret = asf_read_file_properties(s);
} else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
ret = asf_read_stream_properties(s, gsize);
} else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
asf_read_content_desc(s);
} else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
asf_read_language_list(s);
} else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
asf_read_ext_content_desc(s);
} else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
asf_read_metadata(s);
} else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
asf_read_metadata(s);
} else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
asf_read_ext_stream_properties(s);
// there could be an optional stream properties object to follow
// if so the next iteration will pick it up
continue;
} else if (!ff_guidcmp(&g, &ff_asf_head1_guid)) {
ff_get_guid(pb, &g);
avio_skip(pb, 6);
continue;
} else if (!ff_guidcmp(&g, &ff_asf_marker_header)) {
asf_read_marker(s);
} else if (avio_feof(pb)) {
return AVERROR_EOF;
} else {
if (!s->keylen) {
if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
AVPacket *const pkt = ffformatcontext(s)->parse_pkt;
unsigned int len;
av_log(s, AV_LOG_WARNING,
"DRM protected stream detected, decoding will likely fail!\n");
len= avio_rl32(pb);
av_log(s, AV_LOG_DEBUG, "Secret data:\n");
if ((ret = av_get_packet(pb, pkt, len)) < 0)
return ret;
av_hex_dump_log(s, AV_LOG_DEBUG, pkt->data, pkt->size);
av_packet_unref(pkt);
len= avio_rl32(pb);
if (len > UINT16_MAX)
return AVERROR_INVALIDDATA;
get_tag(s, "ASF_Protection_Type", -1, len, 32);
len= avio_rl32(pb);
if (len > UINT16_MAX)
return AVERROR_INVALIDDATA;
get_tag(s, "ASF_Key_ID", -1, len, 32);
len= avio_rl32(pb);
if (len > UINT16_MAX)
return AVERROR_INVALIDDATA;
get_tag(s, "ASF_License_URL", -1, len, 32);
} else if (!ff_guidcmp(&g, &ff_asf_ext_content_encryption)) {
av_log(s, AV_LOG_WARNING,
"Ext DRM protected stream detected, decoding will likely fail!\n");
av_dict_set(&s->metadata, "encryption", "ASF Extended Content Encryption", 0);
} else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
av_log(s, AV_LOG_INFO, "Digital signature detected!\n");
}
}
}
if (ret < 0)
return ret;
if (avio_tell(pb) != gpos + gsize)
av_log(s, AV_LOG_DEBUG,
"gpos mismatch our pos=%"PRIu64", end=%"PRId64"\n",
avio_tell(pb) - gpos, gsize);
avio_seek(pb, gpos + gsize, SEEK_SET);
}
ff_get_guid(pb, &g);
avio_rl64(pb);
avio_r8(pb);
avio_r8(pb);
if (avio_feof(pb))
return AVERROR_EOF;
asf->data_offset = avio_tell(pb);
asf->packet_size_left = 0;
for (i = 0; i < 128; i++) {
int stream_num = asf->asfid2avid[i];
if (stream_num >= 0) {
AVStream *st = s->streams[stream_num];
if (!st->codecpar->bit_rate)
st->codecpar->bit_rate = asf->stream_bitrates[i];
if (asf->dar[i].num > 0 && asf->dar[i].den > 0) {
av_reduce(&st->sample_aspect_ratio.num,
&st->sample_aspect_ratio.den,
asf->dar[i].num, asf->dar[i].den, INT_MAX);
} else if ((asf->dar[0].num > 0) && (asf->dar[0].den > 0) &&
// Use ASF container value if the stream doesn't set AR.
(st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO))
av_reduce(&st->sample_aspect_ratio.num,
&st->sample_aspect_ratio.den,
asf->dar[0].num, asf->dar[0].den, INT_MAX);
av_log(s, AV_LOG_TRACE, "i=%d, st->codecpar->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
i, st->codecpar->codec_type, asf->dar[i].num, asf->dar[i].den,
st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
// copy and convert language codes to the frontend
if (asf->streams[i].stream_language_index < 128) {
const char *rfc1766 = asf->stream_languages[asf->streams[i].stream_language_index];
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)
av_dict_set(&st->metadata, "language", iso6392, 0);
}
}
}
}
ff_metadata_conv(&s->metadata, NULL, ff_asf_metadata_conv);
return 0;
}
#define DO_2BITS(bits, var, defval) \
switch (bits & 3) { \
case 3: \
var = avio_rl32(pb); \
rsize += 4; \
break; \
case 2: \
var = avio_rl16(pb); \
rsize += 2; \
break; \
case 1: \
var = avio_r8(pb); \
rsize++; \
break; \
default: \
var = defval; \
break; \
}
/**
* Load a single ASF packet into the demuxer.
* @param s demux context
* @param pb context to read data from
* @return 0 on success, <0 on error
*/
static int asf_get_packet(AVFormatContext *s, AVIOContext *pb)
{
ASFContext *asf = s->priv_data;
uint32_t packet_length, padsize;
int rsize = 8;
int c, d, e, off;
if (asf->uses_std_ecc > 0) {
// if we do not know packet size, allow skipping up to 32 kB
off = 32768;
if (asf->no_resync_search)
off = 3;
// else if (s->packet_size > 0 && !asf->uses_std_ecc)
// off = (avio_tell(pb) - ffformatcontext(s)->data_offset) % s->packet_size + 3;
c = d = e = -1;
while (off-- > 0) {
c = d;
d = e;
e = avio_r8(pb);
if (c == 0x82 && !d && !e)
break;
}
if (c != 0x82) {
/* This code allows handling of -EAGAIN at packet boundaries (i.e.
* if the packet sync code above triggers -EAGAIN). This does not
* imply complete -EAGAIN handling support at random positions in
* the stream. */
if (pb->error == AVERROR(EAGAIN))
return AVERROR(EAGAIN);
if (!avio_feof(pb))
av_log(s, AV_LOG_ERROR,
"ff asf bad header %x at:%"PRId64"\n", c, avio_tell(pb));
}
if ((c & 0x8f) == 0x82) {
if (d || e) {
if (!avio_feof(pb))
av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
return AVERROR_INVALIDDATA;
}
c = avio_r8(pb);
d = avio_r8(pb);
rsize += 3;
} else if(!avio_feof(pb)) {
avio_seek(pb, -1, SEEK_CUR); // FIXME
}
} else {
c = avio_r8(pb);
if (c & 0x80) {
rsize ++;
if (!(c & 0x60)) {
d = avio_r8(pb);
e = avio_r8(pb);
avio_seek(pb, (c & 0xF) - 2, SEEK_CUR);
rsize += c & 0xF;
}
if (c != 0x82)
avpriv_request_sample(s, "Invalid ECC byte");
if (!asf->uses_std_ecc)
asf->uses_std_ecc = (c == 0x82 && !d && !e) ? 1 : -1;
c = avio_r8(pb);
} else
asf->uses_std_ecc = -1;
d = avio_r8(pb);
}
asf->packet_flags = c;
asf->packet_property = d;
DO_2BITS(asf->packet_flags >> 5, packet_length, s->packet_size);
DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
// the following checks prevent overflows and infinite loops
if (!packet_length || packet_length >= (1U << 29)) {
av_log(s, AV_LOG_ERROR,
"invalid packet_length %"PRIu32" at:%"PRId64"\n",
packet_length, avio_tell(pb));
return AVERROR_INVALIDDATA;
}
if (padsize >= packet_length) {
av_log(s, AV_LOG_ERROR,
"invalid padsize %"PRIu32" at:%"PRId64"\n", padsize, avio_tell(pb));
return AVERROR_INVALIDDATA;
}
asf->packet_timestamp = avio_rl32(pb);
avio_rl16(pb); /* duration */
// rsize has at least 11 bytes which have to be present
if (asf->packet_flags & 0x01) {
asf->packet_segsizetype = avio_r8(pb);
rsize++;
asf->packet_segments = asf->packet_segsizetype & 0x3f;
} else {
asf->packet_segments = 1;
asf->packet_segsizetype = 0x80;
}
if (rsize > packet_length - padsize) {
asf->packet_size_left = 0;
av_log(s, AV_LOG_ERROR,
"invalid packet header length %d for pktlen %"PRIu32"-%"PRIu32" at %"PRId64"\n",
rsize, packet_length, padsize, avio_tell(pb));
return AVERROR_INVALIDDATA;
}
asf->packet_size_left = packet_length - padsize - rsize;
if (packet_length < asf->hdr.min_pktsize)
padsize += asf->hdr.min_pktsize - packet_length;
asf->packet_padsize = padsize;
av_log(s, AV_LOG_TRACE, "packet: size=%d padsize=%d left=%d\n",
s->packet_size, asf->packet_padsize, asf->packet_size_left);
return 0;
}
/**