/*

 * 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;

}

static uint64_t get_value(AVIOContext *pb, int type)

{

    switch (type) {

    case ASF_BOOL:

        return 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 0;

    }

}

static void get_tag(AVFormatContext *s, const char *key, int type, int len)

{

    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:; // ASCII

        int ret = ffio_read_size(s->pb, value, len);

        if (ret < 0)

            goto finish;

        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);

        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;

    ff_dict_set_timestamp(&s->metadata, "creation_time", ff_asf_filetime_to_avtime(asf->hdr.create_time));

    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);

    get_tag(s, "author", 0, len2);

    get_tag(s, "copyright", 0, len3);

    get_tag(s, "comment", 0, len4);

    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;

        /* size of type 2 (BOOL) is 32bit for "Extended Content Description Object"

         * but 16 bit for "Metadata Object" and "Metadata Library Object" */

        if (value_type == ASF_BOOL)

            value_type = ASF_DWORD;

        /* 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);

        else if (!strcmp(name, "AspectRatioY"))

            asf->dar[0].den = get_value(s->pb, value_type);

        else

            get_tag(s, name, value_type, value_len);

    }

    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;

    unsigned int 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 >= (INT_MAX - LEN) / 2)

            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);

            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);

            if(stream_num < 128)

                asf->dar[stream_num].den = aspect_y;

        } else {

            get_tag(s, name, value_type, value_len);

        }

        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;

        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);

                    len= avio_rl32(pb);

                    if (len > UINT16_MAX)

                        return AVERROR_INVALIDDATA;

                    get_tag(s, "ASF_Key_ID", -1, len);

                    len= avio_rl32(pb);

                    if (len > UINT16_MAX)

                        return AVERROR_INVALIDDATA;

                    get_tag(s, "ASF_License_URL", -1, len);

                } 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;

}

/**

 *

 * @return <0 if error

 */

static int asf_read_frame_header(AVFormatContext *s, AVIOContext *pb)

{

    ASFContext *asf = s->priv_data;

    ASFStream *asfst;

    int rsize       = 1;

    int num         = avio_r8(pb);

    int i;

    int64_t ts0, ts1 av_unused;

    asf->packet_segments--;

    asf->packet_key_frame = num >> 7;

    asf->stream_index     = asf->asfid2avid[num & 0x7f];

    asfst                 = &asf->streams[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_log(asf, AV_LOG_TRACE, "key:%d stream:%d seq:%d offset:%d replic_size:%d num:%X packet_property %X\n",

            asf->packet_key_frame, asf->stream_index, asf->packet_seq,

            asf->packet_frag_offset, asf->packet_replic_size, num, asf->packet_property);

    if (rsize+(int64_t)asf->packet_replic_size > asf->packet_size_left) {

        av_log(s, AV_LOG_ERROR, "packet_replic_size %d is invalid\n", asf->packet_replic_size);

        return AVERROR_INVALIDDATA;

    }

    if (asf->packet_replic_size >= 8) {

        int64_t end = avio_tell(pb) + asf->packet_replic_size;

        AVRational aspect;

        asfst->packet_obj_size = avio_rl32(pb);

        if (asfst->packet_obj_size >= (1 << 24) || asfst->packet_obj_size < 0) {

            av_log(s, AV_LOG_ERROR, "packet_obj_size %d invalid\n", asfst->packet_obj_size);