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FFmpeg/libavformat/asfdec.c
Vittorio Giovara 0af3b65880 asf: do not export XMP metadata by default 
Similarly to what has been done for MOV, display XMP metadata only when
users explicitly require it.

The Extensible Metadata Platform tag can contain various kind of data
which are not strictly related to the video file, such as history of
edits and saves from the project file.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
2015-03-03 15:30:52 +00:00

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/*
* ASF compatible demuxer
* Copyright (c) 2000, 2001 Fabrice Bellard
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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/opt.h"
#include "avformat.h"
#include "avio_internal.h"
#include "avlanguage.h"
#include "id3v2.h"
#include "internal.h"
#include "riff.h"
#include "asf.h"
#include "asfcrypt.h"
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 packet_multi_size;
int packet_obj_size;
int packet_time_delta;
int packet_time_start;
int64_t packet_pos;
int stream_index;
ASFStream *asf_st; ///< currently decoded stream
int no_resync_search;
int export_xmp;
} 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_INT, { .i64 = 0 }, 0, 1, AV_OPT_FLAG_DECODING_PARAM },
{ "export_xmp", "Export full XMP metadata", offsetof(ASFContext, export_xmp), AV_OPT_TYPE_INT, { .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 17
// Fix Me! FRAME_HEADER_SIZE may be different.
static const ff_asf_guid index_guid = {
0x90, 0x08, 0x00, 0x33, 0xb1, 0xe5, 0xcf, 0x11, 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb
};
#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
};
#define PRINT_IF_GUID(g, cmp) \
if (!ff_guidcmp(g, &cmp)) \
av_dlog(NULL, "(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, ff_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, index_guid);
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_dlog(NULL, "(GUID: unknown) ");
for (i = 0; i < 16; i++)
av_dlog(NULL, " 0x%02x,", (*g)[i]);
av_dlog(NULL, "}\n");
}
#undef PRINT_IF_GUID
#else
#define print_guid(g)
#endif
static int asf_probe(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 2:
return (type2_size == 32) ? avio_rl32(pb) : avio_rl16(pb);
case 3:
return avio_rl32(pb);
case 4:
return avio_rl64(pb);
case 5:
return avio_rl16(pb);
default:
return INT_MIN;
}
}
/* MSDN claims that this should be "compatible with the ID3 frame, APIC",
* but in reality this is only loosely similar */
static int asf_read_picture(AVFormatContext *s, int len)
{
AVPacket pkt = { 0 };
const CodecMime *mime = ff_id3v2_mime_tags;
enum AVCodecID id = AV_CODEC_ID_NONE;
char mimetype[64];
uint8_t *desc = NULL;
AVStream *st = NULL;
int ret, type, picsize, desc_len;
/* type + picsize + mime + desc */
if (len < 1 + 4 + 2 + 2) {
av_log(s, AV_LOG_ERROR, "Invalid attached picture size: %d.\n", len);
return AVERROR_INVALIDDATA;
}
/* picture type */
type = avio_r8(s->pb);
len--;
if (type >= FF_ARRAY_ELEMS(ff_id3v2_picture_types) || type < 0) {
av_log(s, AV_LOG_WARNING, "Unknown attached picture type: %d.\n", type);
type = 0;
}
/* picture data size */
picsize = avio_rl32(s->pb);
len -= 4;
/* picture MIME type */
len -= avio_get_str16le(s->pb, len, mimetype, sizeof(mimetype));
while (mime->id != AV_CODEC_ID_NONE) {
if (!strncmp(mime->str, mimetype, sizeof(mimetype))) {
id = mime->id;
break;
}
mime++;
}
if (id == AV_CODEC_ID_NONE) {
av_log(s, AV_LOG_ERROR, "Unknown attached picture mimetype: %s.\n",
mimetype);
return 0;
}
if (picsize >= len) {
av_log(s, AV_LOG_ERROR, "Invalid attached picture data size: %d >= %d.\n",
picsize, len);
return AVERROR_INVALIDDATA;
}
/* picture description */
desc_len = (len - picsize) * 2 + 1;
desc = av_malloc(desc_len);
if (!desc)
return AVERROR(ENOMEM);
len -= avio_get_str16le(s->pb, len - picsize, desc, desc_len);
ret = av_get_packet(s->pb, &pkt, picsize);
if (ret < 0)
goto fail;
st = avformat_new_stream(s, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto fail;
}
st->disposition |= AV_DISPOSITION_ATTACHED_PIC;
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
st->codec->codec_id = id;
st->attached_pic = pkt;
st->attached_pic.stream_index = st->index;
st->attached_pic.flags |= AV_PKT_FLAG_KEY;
if (*desc)
av_dict_set(&st->metadata, "title", desc, AV_DICT_DONT_STRDUP_VAL);
else
av_freep(&desc);
av_dict_set(&st->metadata, "comment", ff_id3v2_picture_types[type], 0);
return 0;
fail:
av_freep(&desc);
av_free_packet(&pkt);
return ret;
}
static void get_id3_tag(AVFormatContext *s, int len)
{
ID3v2ExtraMeta *id3v2_extra_meta = NULL;
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
if (id3v2_extra_meta)
ff_id3v2_parse_apic(s, &id3v2_extra_meta);
ff_id3v2_free_extra_meta(&id3v2_extra_meta);
}
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);
if ((unsigned)len >= (UINT_MAX - 1) / 2)
return;
if (!asf->export_xmp && !strncmp(key, "xmp", 3))
goto finish;
value = av_malloc(2 * len + 1);
if (!value)
goto finish;
if (type == 0) { // UTF16-LE
avio_get_str16le(s->pb, len, value, 2 * len + 1);
} else if (type == 1) { // byte array
if (!strcmp(key, "WM/Picture")) { // handle cover art
asf_read_picture(s, len);
} else if (!strcmp(key, "ID3")) { // handle ID3 tag
get_id3_tag(s, len);
} else {
av_log(s, AV_LOG_VERBOSE, "Unsupported byte array in tag %s.\n", key);
}
goto finish;
} else if (type > 1 && type <= 5) { // boolean or DWORD or QWORD or WORD
uint64_t num = get_value(s->pb, type, type2_size);
snprintf(value, len, "%"PRIu64, num);
} else if (type == 6) { // (don't) handle GUID
av_log(s, AV_LOG_DEBUG, "Unsupported GUID value in tag %s.\n", key);
goto finish;
} else {
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, int64_t size)
{
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;
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);
avpriv_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
asf_st = av_mallocz(sizeof(ASFStream));
if (!asf_st)
return AVERROR(ENOMEM);
st->priv_data = asf_st;
st->start_time = 0;
start_time = asf->hdr.preroll;
asf_st->stream_language_index = 128; // invalid stream index means no language info
if (!(asf->hdr.flags & 0x01)) { // if we aren't streaming...
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->codec->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;
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->codec->codec_type = type;
if (type == AVMEDIA_TYPE_AUDIO) {
int ret = ff_get_wav_header(pb, st->codec, type_specific_size);
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.
st->codec->codec_id = AV_CODEC_ID_PROBE;
st->codec->codec_tag = 0;
}
if (st->codec->codec_id == AV_CODEC_ID_AAC)
st->need_parsing = AVSTREAM_PARSE_NONE;
else
st->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->codec->width = avio_rl32(pb);
st->codec->height = avio_rl32(pb);
/* not available for asf */
avio_rl16(pb); /* panes */
st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
tag1 = avio_rl32(pb);
avio_skip(pb, 20);
if (sizeX > 40) {
st->codec->extradata_size = sizeX - 40;
st->codec->extradata = av_mallocz(st->codec->extradata_size +
FF_INPUT_BUFFER_PADDING_SIZE);
avio_read(pb, st->codec->extradata, st->codec->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->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
#if HAVE_BIGENDIAN
int i;
for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE) / 4; i++)
asf_st->palette[i] = av_bswap32(((uint32_t *)st->codec->extradata)[i]);
#else
memcpy(asf_st->palette, st->codec->extradata,
FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
#endif
asf_st->palette_changed = 1;
}
st->codec->codec_tag = tag1;
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
if (tag1 == MKTAG('D', 'V', 'R', ' ')) {
st->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->codec->width =
st->codec->height = 0;
av_freep(&st->codec->extradata);
st->codec->extradata_size = 0;
}
if (st->codec->codec_id == AV_CODEC_ID_H264)
st->need_parsing = AVSTREAM_PARSE_FULL_ONCE;
}
pos2 = avio_tell(pb);
avio_skip(pb, size - (pos2 - pos1 + 24));
return 0;
}
static int asf_read_ext_stream_properties(AVFormatContext *s, int64_t size)
{
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;
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++) {
ff_get_guid(pb, &g);
avio_skip(pb, 2);
ext_len = avio_rl32(pb);
avio_skip(pb, ext_len);
}
return 0;
}
static int asf_read_content_desc(AVFormatContext *s, int64_t size)
{
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, int64_t size)
{
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, int64_t size)
{
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, int64_t size)
{
AVIOContext *pb = s->pb;
ASFContext *asf = s->priv_data;
int n, stream_num, name_len, value_len;
int ret, i;
n = avio_rl16(pb);
for (i = 0; i < n; i++) {
char name[1024];
int value_type;
avio_rl16(pb); // lang_list_index
stream_num = avio_rl16(pb);
name_len = avio_rl16(pb);
value_type = avio_rl16(pb); /* value_type */
value_len = avio_rl32(pb);
if ((ret = avio_get_str16le(pb, name_len, name, sizeof(name))) < name_len)
avio_skip(pb, name_len - ret);
av_dlog(s, "%d stream %d name_len %2d type %d len %4d <%s>\n",
i, stream_num, name_len, 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);
}
}
return 0;
}
static int asf_read_marker(AVFormatContext *s, int64_t size)
{
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
for (i = 0; i < name_len; i++)
avio_r8(pb); // skip the name
for (i = 0; i < count; i++) {
int64_t pres_time;
int name_len;
avio_rl64(pb); // offset, 8 bytes
pres_time = avio_rl64(pb); // presentation time
pres_time -= asf->hdr.preroll * 10000;
avio_rl16(pb); // entry length
avio_rl32(pb); // send time
avio_rl32(pb); // flags
name_len = avio_rl32(pb); // name length
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 -1;
avio_rl64(pb);
avio_rl32(pb);
avio_r8(pb);
avio_r8(pb);
memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
for (;;) {
uint64_t gpos = avio_tell(pb);
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 -1;
if (!ff_guidcmp(&g, &ff_asf_file_header)) {
int ret = asf_read_file_properties(s, gsize);
if (ret < 0)
return ret;
} else if (!ff_guidcmp(&g, &ff_asf_stream_header)) {
int ret = asf_read_stream_properties(s, gsize);
if (ret < 0)
return ret;
} else if (!ff_guidcmp(&g, &ff_asf_comment_header)) {
asf_read_content_desc(s, gsize);
} else if (!ff_guidcmp(&g, &ff_asf_language_guid)) {
asf_read_language_list(s, gsize);
} else if (!ff_guidcmp(&g, &ff_asf_extended_content_header)) {
asf_read_ext_content_desc(s, gsize);
} else if (!ff_guidcmp(&g, &ff_asf_metadata_header)) {
asf_read_metadata(s, gsize);
} else if (!ff_guidcmp(&g, &ff_asf_metadata_library_header)) {
asf_read_metadata(s, gsize);
} else if (!ff_guidcmp(&g, &ff_asf_ext_stream_header)) {
asf_read_ext_stream_properties(s, gsize);
// there could be a 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, gsize);
} else if (pb->eof_reached) {
return -1;
} else {
if (!s->keylen) {
if (!ff_guidcmp(&g, &ff_asf_content_encryption)) {
av_log(s, AV_LOG_WARNING,
"DRM protected stream detected, decoding will likely fail!\n");
} 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");
} else if (!ff_guidcmp(&g, &ff_asf_digital_signature)) {
av_log(s, AV_LOG_WARNING,
"Digital signature detected, decoding will likely fail!\n");
}
}
}
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 (pb->eof_reached)
return -1;
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->codec->bit_rate)
st->codec->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->codec->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_dlog(s, "i=%d, st->codec->codec_type:%d, asf->dar %d:%d sar=%d:%d\n",
i, st->codec->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 = av_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 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)
off = (avio_tell(pb) - s->internal->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 (!pb->eof_reached)
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 (!pb->eof_reached)
av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
return -1;
}
c = avio_r8(pb);
d = avio_r8(pb);
rsize += 3;
} else if (!pb->eof_reached) {
avio_seek(pb, -1, SEEK_CUR); // FIXME
}
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 -1;
}
if (padsize >= packet_length) {
av_log(s, AV_LOG_ERROR,
"invalid padsize %"PRIu32" at:%"PRId64"\n", padsize, avio_tell(pb));
return -1;
}
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 -1;
}
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_dlog(s, "packet: size=%d padsize=%d left=%d\n",
s->packet_size, asf->packet_padsize, asf->packet_size_left);
return 0;
}
/**
*
* @return <0 if error
*/
static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)
{
ASFContext *asf = s->priv_data;
int rsize = 1;
int num = avio_r8(pb);
int64_t ts0;
asf->packet_segments--;
asf->packet_key_frame = num >> 7;
asf->stream_index = asf->asfid2avid[num & 0x7f];
// sequence should be ignored!
DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
av_dlog(asf, "key:%d stream:%d seq:%d offset:%d replic_size:%d\n",
asf->packet_key_frame, asf->stream_index, asf->packet_seq,
asf->packet_frag_offset, asf->packet_replic_size);
if (asf->packet_replic_size >= 8) {
asf->packet_obj_size = avio_rl32(pb);
if (asf->packet_obj_size >= (1 << 24) || asf->packet_obj_size <= 0) {
av_log(s, AV_LOG_ERROR, "packet_obj_size invalid\n");
return -1;
}
asf->packet_frag_timestamp = avio_rl32(pb); // timestamp
if (asf->packet_replic_size >= 8 + 38 + 4) {
avio_skip(pb, 10);
ts0 = avio_rl64(pb);
avio_skip(pb, 8);
avio_skip(pb, 12);
avio_rl32(pb);
avio_skip(pb, asf->packet_replic_size - 8 - 38 - 4);
if (ts0 != -1)
asf->packet_frag_timestamp = ts0 / 10000;
else
asf->packet_frag_timestamp = AV_NOPTS_VALUE;
} else
avio_skip(pb, asf->packet_replic_size - 8);
rsize += asf->packet_replic_size; // FIXME - check validity
} else if (asf->packet_replic_size == 1) {
// multipacket - frag_offset is beginning timestamp
asf->packet_time_start = asf->packet_frag_offset;
asf->packet_frag_offset = 0;
asf->packet_frag_timestamp = asf->packet_timestamp;
asf->packet_time_delta = avio_r8(pb);
rsize++;
} else if (asf->packet_replic_size != 0) {
av_log(s, AV_LOG_ERROR, "unexpected packet_replic_size of %d\n",
asf->packet_replic_size);
return -1;
}
if (asf->packet_flags & 0x01) {
DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
if (rsize > asf->packet_size_left) {
av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
return -1;
} else if (asf->packet_frag_size > asf->packet_size_left - rsize) {
if (asf->packet_frag_size > asf->packet_size_left - rsize + asf->packet_padsize) {
av_log(s, AV_LOG_ERROR, "packet_frag_size is invalid (%d-%d)\n",
asf->packet_size_left, rsize);
return -1;
} else {
int diff = asf->packet_frag_size - (asf->packet_size_left - rsize);
asf->packet_size_left += diff;
asf->packet_padsize -= diff;
}
}
} else {
if (rsize > asf->packet_size_left) {
av_log(s, AV_LOG_ERROR, "packet_replic_size is invalid\n");
return -1;
}
asf->packet_frag_size = asf->packet_size_left - rsize;
}
if (asf->packet_replic_size == 1) {
asf->packet_multi_size = asf->packet_frag_size;
if (asf->packet_multi_size > asf->packet_size_left)
return -1;
}
asf->packet_size_left -= rsize;
return 0;
}
/**
* Parse data from individual ASF packets (which were previously loaded
* with asf_get_packet()).
* @param s demux context
* @param pb context to read data from
* @param pkt pointer to store packet data into
* @return 0 if data was stored in pkt, <0 on error or 1 if more ASF
* packets need to be loaded (through asf_get_packet())
*/
static int asf_parse_packet(AVFormatContext *s, AVIOContext *pb, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
ASFStream *asf_st = 0;
for (;;) {
int ret;
if (pb->eof_reached)
return AVERROR_EOF;
if (asf->packet_size_left < FRAME_HEADER_SIZE ||
asf->packet_segments < 1) {
int ret = asf->packet_size_left + asf->packet_padsize;
assert(ret >= 0);
/* fail safe */
avio_skip(pb, ret);
asf->packet_pos = avio_tell(pb);
if (asf->data_object_size != (uint64_t)-1 &&
(asf->packet_pos - asf->data_object_offset >= asf->data_object_size))
return AVERROR_EOF; /* Do not exceed the size of the data object */
return 1;
}
if (asf->packet_time_start == 0) {
if (asf_read_frame_header(s, pb) < 0) {
asf->packet_segments = 0;
continue;
}
if (asf->stream_index < 0 ||
s->streams[asf->stream_index]->discard >= AVDISCARD_ALL ||
(!asf->packet_key_frame &&
s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)) {
asf->packet_time_start = 0;
/* unhandled packet (should not happen) */
avio_skip(pb, asf->packet_frag_size);
asf->packet_size_left -= asf->packet_frag_size;
if (asf->stream_index < 0)
av_log(s, AV_LOG_ERROR, "ff asf skip %d (unknown stream)\n",
asf->packet_frag_size);
continue;
}
asf->asf_st = s->streams[asf->stream_index]->priv_data;
}
asf_st = asf->asf_st;
av_assert0(asf_st);
if (!asf_st->frag_offset && asf->packet_frag_offset) {
av_dlog(s, "skipping asf data pkt with fragment offset for "
"stream:%d, expected:%d but got %d from pkt)\n",
asf->stream_index, asf_st->frag_offset,
asf->packet_frag_offset);
avio_skip(pb, asf->packet_frag_size);
asf->packet_size_left -= asf->packet_frag_size;
continue;
}
if (asf->packet_replic_size == 1) {
// frag_offset is here used as the beginning timestamp
asf->packet_frag_timestamp = asf->packet_time_start;
asf->packet_time_start += asf->packet_time_delta;
asf->packet_obj_size = asf->packet_frag_size = avio_r8(pb);
asf->packet_size_left--;
asf->packet_multi_size--;
if (asf->packet_multi_size < asf->packet_obj_size) {
asf->packet_time_start = 0;
avio_skip(pb, asf->packet_multi_size);
asf->packet_size_left -= asf->packet_multi_size;
continue;
}
asf->packet_multi_size -= asf->packet_obj_size;
}
if (asf_st->frag_offset + asf->packet_frag_size <= asf_st->pkt.size &&
asf_st->frag_offset + asf->packet_frag_size > asf->packet_obj_size) {
av_log(s, AV_LOG_INFO, "ignoring invalid packet_obj_size (%d %d %d %d)\n",
asf_st->frag_offset, asf->packet_frag_size,
asf->packet_obj_size, asf_st->pkt.size);
asf->packet_obj_size = asf_st->pkt.size;
}
if (asf_st->pkt.size != asf->packet_obj_size ||
// FIXME is this condition sufficient?
asf_st->frag_offset + asf->packet_frag_size > asf_st->pkt.size) {
if (asf_st->pkt.data) {
av_log(s, AV_LOG_INFO,
"freeing incomplete packet size %d, new %d\n",
asf_st->pkt.size, asf->packet_obj_size);
asf_st->frag_offset = 0;
av_free_packet(&asf_st->pkt);
}
/* new packet */
av_new_packet(&asf_st->pkt, asf->packet_obj_size);
asf_st->seq = asf->packet_seq;
asf_st->pkt.dts = asf->packet_frag_timestamp - asf->hdr.preroll;
asf_st->pkt.stream_index = asf->stream_index;
asf_st->pkt.pos = asf_st->packet_pos = asf->packet_pos;
if (asf_st->pkt.data && asf_st->palette_changed) {
uint8_t *pal;
pal = av_packet_new_side_data(&asf_st->pkt, AV_PKT_DATA_PALETTE,
AVPALETTE_SIZE);
if (!pal) {
av_log(s, AV_LOG_ERROR, "Cannot append palette to packet\n");
} else {
memcpy(pal, asf_st->palette, AVPALETTE_SIZE);
asf_st->palette_changed = 0;
}
}
av_dlog(asf, "new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
asf->stream_index, asf->packet_key_frame,
asf_st->pkt.flags & AV_PKT_FLAG_KEY,
s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO,
asf->packet_obj_size);
if (s->streams[asf->stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
asf->packet_key_frame = 1;
if (asf->packet_key_frame)
asf_st->pkt.flags |= AV_PKT_FLAG_KEY;
}
/* read data */
av_dlog(asf, "READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
s->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
asf->packet_size_left -= asf->packet_frag_size;
if (asf->packet_size_left < 0)
continue;
if (asf->packet_frag_offset >= asf_st->pkt.size ||
asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset) {
av_log(s, AV_LOG_ERROR,
"packet fragment position invalid %u,%u not in %u\n",
asf->packet_frag_offset, asf->packet_frag_size,
asf_st->pkt.size);
continue;
}
ret = avio_read(pb, asf_st->pkt.data + asf->packet_frag_offset,
asf->packet_frag_size);
if (ret != asf->packet_frag_size) {
if (ret < 0 || asf->packet_frag_offset + ret == 0)
return ret < 0 ? ret : AVERROR_EOF;
if (asf_st->ds_span > 1) {
// scrambling, we can either drop it completely or fill the remainder
// TODO: should we fill the whole packet instead of just the current
// fragment?
memset(asf_st->pkt.data + asf->packet_frag_offset + ret, 0,
asf->packet_frag_size - ret);
ret = asf->packet_frag_size;
} else {
// no scrambling, so we can return partial packets
av_shrink_packet(&asf_st->pkt, asf->packet_frag_offset + ret);
}
}
if (s->key && s->keylen == 20)
ff_asfcrypt_dec(s->key, asf_st->pkt.data + asf->packet_frag_offset,
ret);
asf_st->frag_offset += ret;
/* test if whole packet is read */
if (asf_st->frag_offset == asf_st->pkt.size) {
// workaround for macroshit radio DVR-MS files
if (s->streams[asf->stream_index]->codec->codec_id == AV_CODEC_ID_MPEG2VIDEO &&
asf_st->pkt.size > 100) {
int i;
for (i = 0; i < asf_st->pkt.size && !asf_st->pkt.data[i]; i++)
;
if (i == asf_st->pkt.size) {
av_log(s, AV_LOG_DEBUG, "discarding ms fart\n");
asf_st->frag_offset = 0;
av_free_packet(&asf_st->pkt);
continue;
}
}
/* return packet */
if (asf_st->ds_span > 1) {
if (asf_st->pkt.size != asf_st->ds_packet_size * asf_st->ds_span) {
av_log(s, AV_LOG_ERROR,
"pkt.size != ds_packet_size * ds_span (%d %d %d)\n",
asf_st->pkt.size, asf_st->ds_packet_size,
asf_st->ds_span);
} else {
/* packet descrambling */
AVBufferRef *buf = av_buffer_alloc(asf_st->pkt.size +
FF_INPUT_BUFFER_PADDING_SIZE);
if (buf) {
uint8_t *newdata = buf->data;
int offset = 0;
memset(newdata + asf_st->pkt.size, 0,
FF_INPUT_BUFFER_PADDING_SIZE);
while (offset < asf_st->pkt.size) {
int off = offset / asf_st->ds_chunk_size;
int row = off / asf_st->ds_span;
int col = off % asf_st->ds_span;
int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
assert(offset + asf_st->ds_chunk_size <= asf_st->pkt.size);
assert(idx + 1 <= asf_st->pkt.size / asf_st->ds_chunk_size);
memcpy(newdata + offset,
asf_st->pkt.data + idx * asf_st->ds_chunk_size,
asf_st->ds_chunk_size);
offset += asf_st->ds_chunk_size;
}
av_buffer_unref(&asf_st->pkt.buf);
asf_st->pkt.buf = buf;
asf_st->pkt.data = buf->data;
}
}
}
asf_st->frag_offset = 0;
*pkt = asf_st->pkt;
#if FF_API_DESTRUCT_PACKET
FF_DISABLE_DEPRECATION_WARNINGS
asf_st->pkt.destruct = NULL;
FF_ENABLE_DEPRECATION_WARNINGS
#endif
asf_st->pkt.buf = 0;
asf_st->pkt.size = 0;
asf_st->pkt.data = 0;
asf_st->pkt.side_data_elems = 0;
asf_st->pkt.side_data = NULL;
break; // packet completed
}
}
return 0;
}
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
ASFContext *asf = s->priv_data;
for (;;) {
int ret;
/* parse cached packets, if any */
if ((ret = asf_parse_packet(s, s->pb, pkt)) <= 0)
return ret;
if ((ret = asf_get_packet(s, s->pb)) < 0)
assert(asf->packet_size_left < FRAME_HEADER_SIZE ||
asf->packet_segments < 1);
asf->packet_time_start = 0;
}
}
// Added to support seeking after packets have been read
// If information is not reset, read_packet fails due to
// leftover information from previous reads
static void asf_reset_header(AVFormatContext *s)
{
ASFContext *asf = s->priv_data;
ASFStream *asf_st;
int i;
asf->packet_size_left = 0;
asf->packet_segments = 0;
asf->packet_flags = 0;
asf->packet_property = 0;
asf->packet_timestamp = 0;
asf->packet_segsizetype = 0;
asf->packet_segments = 0;
asf->packet_seq = 0;
asf->packet_replic_size = 0;
asf->packet_key_frame = 0;
asf->packet_padsize = 0;
asf->packet_frag_offset = 0;
asf->packet_frag_size = 0;
asf->packet_frag_timestamp = 0;
asf->packet_multi_size = 0;
asf->packet_obj_size = 0;
asf->packet_time_delta = 0;
asf->packet_time_start = 0;
for (i = 0; i < s->nb_streams; i++) {
asf_st = s->streams[i]->priv_data;
if (!asf_st)
continue;
av_free_packet(&asf_st->pkt);
asf_st->frag_offset = 0;
asf_st->seq = 0;
}
asf->asf_st = NULL;
}
static int asf_read_close(AVFormatContext *s)
{
asf_reset_header(s);
return 0;
}
static int64_t asf_read_pts(AVFormatContext *s, int stream_index,
int64_t *ppos, int64_t pos_limit)
{
AVPacket pkt1, *pkt = &pkt1;
ASFStream *asf_st;
int64_t pts;
int64_t pos = *ppos;
int i;
int64_t start_pos[ASF_MAX_STREAMS];
for (i = 0; i < s->nb_streams; i++)
start_pos[i] = pos;
if (s->packet_size > 0)
pos = (pos + s->packet_size - 1 - s->internal->data_offset) /
s->packet_size * s->packet_size +
s->internal->data_offset;
*ppos = pos;
avio_seek(s->pb, pos, SEEK_SET);
asf_reset_header(s);
for (;;) {
if (asf_read_packet(s, pkt) < 0) {
av_log(s, AV_LOG_INFO, "asf_read_pts failed\n");
return AV_NOPTS_VALUE;
}
pts = pkt->dts;
av_free_packet(pkt);
if (pkt->flags & AV_PKT_FLAG_KEY) {
i = pkt->stream_index;
asf_st = s->streams[i]->priv_data;
av_assert0(asf_st);
// assert((asf_st->packet_pos - s->data_offset) % s->packet_size == 0);
pos = asf_st->packet_pos;
av_add_index_entry(s->streams[i], pos, pts, pkt->size,
pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
start_pos[i] = asf_st->packet_pos + 1;
if (pkt->stream_index == stream_index)
break;
}
}
*ppos = pos;
return pts;
}
static int asf_build_simple_index(AVFormatContext *s, int stream_index)
{
ff_asf_guid g;
ASFContext *asf = s->priv_data;
int64_t current_pos = avio_tell(s->pb);
int i, ret = 0;
avio_seek(s->pb, asf->data_object_offset + asf->data_object_size, SEEK_SET);
if ((ret = ff_get_guid(s->pb, &g)) < 0)
goto end;
/* the data object can be followed by other top-level objects,
* skip them until the simple index object is reached */
while (ff_guidcmp(&g, &index_guid)) {
int64_t gsize = avio_rl64(s->pb);
if (gsize < 24 || s->pb->eof_reached) {
goto end;
}
avio_skip(s->pb, gsize - 24);
if ((ret = ff_get_guid(s->pb, &g)) < 0)
goto end;
}
{
int64_t itime, last_pos = -1;
int pct, ict;
int64_t av_unused gsize = avio_rl64(s->pb);
if ((ret = ff_get_guid(s->pb, &g)) < 0)
goto end;
itime = avio_rl64(s->pb);
pct = avio_rl32(s->pb);
ict = avio_rl32(s->pb);
av_log(s, AV_LOG_DEBUG,
"itime:0x%"PRIx64", pct:%d, ict:%d\n", itime, pct, ict);
for (i = 0; i < ict; i++) {
int pktnum = avio_rl32(s->pb);
int pktct = avio_rl16(s->pb);
int64_t pos = s->internal->data_offset + s->packet_size * (int64_t)pktnum;
int64_t index_pts = FFMAX(av_rescale(itime, i, 10000) - asf->hdr.preroll, 0);
if (pos != last_pos) {
av_log(s, AV_LOG_DEBUG, "pktnum:%d, pktct:%d pts: %"PRId64"\n",
pktnum, pktct, index_pts);
av_add_index_entry(s->streams[stream_index], pos, index_pts,
s->packet_size, 0, AVINDEX_KEYFRAME);
last_pos = pos;
}
}
asf->index_read = ict > 0;
}
end:
if (s->pb->eof_reached)
ret = 0;
avio_seek(s->pb, current_pos, SEEK_SET);
return ret;
}
static int asf_read_seek(AVFormatContext *s, int stream_index,
int64_t pts, int flags)
{
ASFContext *asf = s->priv_data;
AVStream *st = s->streams[stream_index];
int64_t pos;
int index, ret = 0;
if (s->packet_size <= 0)
return -1;
/* Try using the protocol's read_seek if available */
if (s->pb) {
int ret = avio_seek_time(s->pb, stream_index, pts, flags);
if (ret >= 0)
asf_reset_header(s);
if (ret != AVERROR(ENOSYS))
return ret;
}
/* explicitly handle the case of seeking to 0 */
if (!pts) {
asf_reset_header(s);
avio_seek(s->pb, s->internal->data_offset, SEEK_SET);
return 0;
}
if (!asf->index_read)
ret = asf_build_simple_index(s, stream_index);
if (!ret && asf->index_read && st->index_entries) {
index = av_index_search_timestamp(st, pts, flags);
if (index >= 0) {
/* find the position */
pos = st->index_entries[index].pos;
/* do the seek */
av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos);
avio_seek(s->pb, pos, SEEK_SET);
asf_reset_header(s);
return 0;
}
}
/* no index or seeking by index failed */
if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
return -1;
asf_reset_header(s);
return 0;
}
AVInputFormat ff_asf_demuxer = {
.name = "asf",
.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_seek = asf_read_seek,
.read_timestamp = asf_read_pts,
.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH,
.priv_class = &asf_class,
};
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