PeerStreamer

/*

 * "Real" compatible mux and demux.

 * Copyright (c) 2000, 2001 Fabrice Bellard.

 *

 * This library 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 of the License, or (at your option) any later version.

 *

 * This library 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 this library; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#include "avformat.h"

/* in ms */

#define BUFFER_DURATION 0

typedef struct {

    int nb_packets;

    int packet_total_size;

    int packet_max_size;

    /* codec related output */

    int bit_rate;

    float frame_rate;

    int nb_frames;    /* current frame number */

    int total_frames; /* total number of frames */

    int num;

    AVCodecContext *enc;

} StreamInfo;

typedef struct {

    StreamInfo streams[2];

    StreamInfo *audio_stream, *video_stream;

    int data_pos; /* position of the data after the header */

    int nb_packets;

    int old_format;

    int current_stream;

    int remaining_len;

    /// Audio descrambling matrix parameters

    uint8_t *audiobuf; ///< place to store reordered audio data

    int64_t audiotimestamp; ///< Audio packet timestamp

    int sub_packet_cnt; // Subpacket counter, used while reading

    int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container

    int audio_stream_num; ///< Stream number for audio packets

    int audio_pkt_cnt; ///< Output packet counter

    int audio_framesize; /// Audio frame size from container

} RMContext;

#ifdef CONFIG_MUXERS

static void put_str(ByteIOContext *s, const char *tag)

{

    put_be16(s,strlen(tag));

    while (*tag) {

        put_byte(s, *tag++);

    }

}

static void put_str8(ByteIOContext *s, const char *tag)

{

    put_byte(s, strlen(tag));

    while (*tag) {

        put_byte(s, *tag++);

    }

}

static void rv10_write_header(AVFormatContext *ctx,

                              int data_size, int index_pos)

{

    RMContext *rm = ctx->priv_data;

    ByteIOContext *s = &ctx->pb;

    StreamInfo *stream;

    unsigned char *data_offset_ptr, *start_ptr;

    const char *desc, *mimetype;

    int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;

    int bit_rate, v, duration, flags, data_pos;

    start_ptr = s->buf_ptr;

    put_tag(s, ".RMF");

    put_be32(s,18); /* header size */

    put_be16(s,0);

    put_be32(s,0);

    put_be32(s,4 + ctx->nb_streams); /* num headers */

    put_tag(s,"PROP");

    put_be32(s, 50);

    put_be16(s, 0);

    packet_max_size = 0;

    packet_total_size = 0;

    nb_packets = 0;

    bit_rate = 0;

    duration = 0;

    for(i=0;i<ctx->nb_streams;i++) {

        StreamInfo *stream = &rm->streams[i];

        bit_rate += stream->bit_rate;

        if (stream->packet_max_size > packet_max_size)

            packet_max_size = stream->packet_max_size;

        nb_packets += stream->nb_packets;

        packet_total_size += stream->packet_total_size;

        /* select maximum duration */

        v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);

        if (v > duration)

            duration = v;

    }

    put_be32(s, bit_rate); /* max bit rate */

    put_be32(s, bit_rate); /* avg bit rate */

    put_be32(s, packet_max_size);        /* max packet size */

    if (nb_packets > 0)

        packet_avg_size = packet_total_size / nb_packets;

    else

        packet_avg_size = 0;

    put_be32(s, packet_avg_size);        /* avg packet size */

    put_be32(s, nb_packets);  /* num packets */

    put_be32(s, duration); /* duration */

    put_be32(s, BUFFER_DURATION);           /* preroll */

    put_be32(s, index_pos);           /* index offset */

    /* computation of data the data offset */

    data_offset_ptr = s->buf_ptr;

    put_be32(s, 0);           /* data offset : will be patched after */

    put_be16(s, ctx->nb_streams);    /* num streams */

    flags = 1 | 2; /* save allowed & perfect play */

    if (url_is_streamed(s))

        flags |= 4; /* live broadcast */

    put_be16(s, flags);

    /* comments */

    put_tag(s,"CONT");

    size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) +

        strlen(ctx->comment) + 4 * 2 + 10;

    put_be32(s,size);

    put_be16(s,0);

    put_str(s, ctx->title);

    put_str(s, ctx->author);

    put_str(s, ctx->copyright);

    put_str(s, ctx->comment);

    for(i=0;i<ctx->nb_streams;i++) {

        int codec_data_size;

        stream = &rm->streams[i];

        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {

            desc = "The Audio Stream";

            mimetype = "audio/x-pn-realaudio";

            codec_data_size = 73;

        } else {

            desc = "The Video Stream";

            mimetype = "video/x-pn-realvideo";

            codec_data_size = 34;

        }

        put_tag(s,"MDPR");

        size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;

        put_be32(s, size);

        put_be16(s, 0);

        put_be16(s, i); /* stream number */

        put_be32(s, stream->bit_rate); /* max bit rate */

        put_be32(s, stream->bit_rate); /* avg bit rate */

        put_be32(s, stream->packet_max_size);        /* max packet size */

        if (stream->nb_packets > 0)

            packet_avg_size = stream->packet_total_size /

                stream->nb_packets;

        else

            packet_avg_size = 0;

        put_be32(s, packet_avg_size);        /* avg packet size */

        put_be32(s, 0);           /* start time */

        put_be32(s, BUFFER_DURATION);           /* preroll */

        /* duration */

        if (url_is_streamed(s) || !stream->total_frames)

            put_be32(s, (int)(3600 * 1000));

        else

            put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));

        put_str8(s, desc);

        put_str8(s, mimetype);

        put_be32(s, codec_data_size);

        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {

            int coded_frame_size, fscode, sample_rate;

            sample_rate = stream->enc->sample_rate;

            coded_frame_size = (stream->enc->bit_rate *

                                stream->enc->frame_size) / (8 * sample_rate);

            /* audio codec info */

            put_tag(s, ".ra");

            put_byte(s, 0xfd);

            put_be32(s, 0x00040000); /* version */

            put_tag(s, ".ra4");

            put_be32(s, 0x01b53530); /* stream length */

            put_be16(s, 4); /* unknown */

            put_be32(s, 0x39); /* header size */

            switch(sample_rate) {

            case 48000:

            case 24000:

            case 12000:

                fscode = 1;

                break;

            default:

            case 44100:

            case 22050:

            case 11025:

                fscode = 2;

                break;

            case 32000:

            case 16000:

            case 8000:

                fscode = 3;

            }

            put_be16(s, fscode); /* codec additional info, for AC3, seems

                                     to be a frequency code */

            /* special hack to compensate rounding errors... */

            if (coded_frame_size == 557)

                coded_frame_size--;

            put_be32(s, coded_frame_size); /* frame length */

            put_be32(s, 0x51540); /* unknown */

            put_be32(s, 0x249f0); /* unknown */

            put_be32(s, 0x249f0); /* unknown */

            put_be16(s, 0x01);

            /* frame length : seems to be very important */

            put_be16(s, coded_frame_size);

            put_be32(s, 0); /* unknown */

            put_be16(s, stream->enc->sample_rate); /* sample rate */

            put_be32(s, 0x10); /* unknown */

            put_be16(s, stream->enc->channels);

            put_str8(s, "Int0"); /* codec name */

            put_str8(s, "dnet"); /* codec name */

            put_be16(s, 0); /* title length */

            put_be16(s, 0); /* author length */

            put_be16(s, 0); /* copyright length */

            put_byte(s, 0); /* end of header */

        } else {

            /* video codec info */

            put_be32(s,34); /* size */

            if(stream->enc->codec_id == CODEC_ID_RV10)

                put_tag(s,"VIDORV10");

            else

                put_tag(s,"VIDORV20");

            put_be16(s, stream->enc->width);

            put_be16(s, stream->enc->height);

            put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */

            put_be32(s,0);     /* unknown meaning */

            put_be16(s, (int) stream->frame_rate);  /* unknown meaning */

            put_be32(s,0);     /* unknown meaning */

            put_be16(s, 8);    /* unknown meaning */

            /* Seems to be the codec version: only use basic H263. The next

               versions seems to add a diffential DC coding as in

               MPEG... nothing new under the sun */

            if(stream->enc->codec_id == CODEC_ID_RV10)

                put_be32(s,0x10000000);

            else

                put_be32(s,0x20103001);

            //put_be32(s,0x10003000);

        }

    }

    /* patch data offset field */

    data_pos = s->buf_ptr - start_ptr;

    rm->data_pos = data_pos;

    data_offset_ptr[0] = data_pos >> 24;

    data_offset_ptr[1] = data_pos >> 16;

    data_offset_ptr[2] = data_pos >> 8;

    data_offset_ptr[3] = data_pos;

    /* data stream */

    put_tag(s,"DATA");

    put_be32(s,data_size + 10 + 8);

    put_be16(s,0);

    put_be32(s, nb_packets); /* number of packets */

    put_be32(s,0); /* next data header */

}

static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,

                                int length, int key_frame)

{

    int timestamp;

    ByteIOContext *s = &ctx->pb;

    stream->nb_packets++;

    stream->packet_total_size += length;

    if (length > stream->packet_max_size)

        stream->packet_max_size =  length;

    put_be16(s,0); /* version */

    put_be16(s,length + 12);

    put_be16(s, stream->num); /* stream number */

    timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;

    put_be32(s, timestamp); /* timestamp */

    put_byte(s, 0); /* reserved */

    put_byte(s, key_frame ? 2 : 0); /* flags */

}

static int rm_write_header(AVFormatContext *s)

{

    RMContext *rm = s->priv_data;

    StreamInfo *stream;

    int n;

    AVCodecContext *codec;

    for(n=0;n<s->nb_streams;n++) {

        s->streams[n]->id = n;

        codec = s->streams[n]->codec;

        stream = &rm->streams[n];

        memset(stream, 0, sizeof(StreamInfo));

        stream->num = n;

        stream->bit_rate = codec->bit_rate;

        stream->enc = codec;

        switch(codec->codec_type) {

        case CODEC_TYPE_AUDIO:

            rm->audio_stream = stream;

            stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;

            /* XXX: dummy values */

            stream->packet_max_size = 1024;

            stream->nb_packets = 0;

            stream->total_frames = stream->nb_packets;

            break;

        case CODEC_TYPE_VIDEO:

            rm->video_stream = stream;

            stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;

            /* XXX: dummy values */

            stream->packet_max_size = 4096;

            stream->nb_packets = 0;

            stream->total_frames = stream->nb_packets;

            break;

        default:

            return -1;

        }

    }

    rv10_write_header(s, 0, 0);

    put_flush_packet(&s->pb);

    return 0;

}

static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)

{

    uint8_t *buf1;

    RMContext *rm = s->priv_data;

    ByteIOContext *pb = &s->pb;

    StreamInfo *stream = rm->audio_stream;

    int i;

    /* XXX: suppress this malloc */

    buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );

    write_packet_header(s, stream, size, !!(flags & PKT_FLAG_KEY));

    /* for AC3, the words seems to be reversed */

    for(i=0;i<size;i+=2) {

        buf1[i] = buf[i+1];

        buf1[i+1] = buf[i];

    }

    put_buffer(pb, buf1, size);

    put_flush_packet(pb);

    stream->nb_frames++;

    av_free(buf1);

    return 0;

}

static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)

{

    RMContext *rm = s->priv_data;

    ByteIOContext *pb = &s->pb;

    StreamInfo *stream = rm->video_stream;

    int key_frame = !!(flags & PKT_FLAG_KEY);

    /* XXX: this is incorrect: should be a parameter */

    /* Well, I spent some time finding the meaning of these bits. I am

       not sure I understood everything, but it works !! */

#if 1

    write_packet_header(s, stream, size + 7, key_frame);

    /* bit 7: '1' if final packet of a frame converted in several packets */

    put_byte(pb, 0x81);

    /* bit 7: '1' if I frame. bits 6..0 : sequence number in current

       frame starting from 1 */

    if (key_frame) {

        put_byte(pb, 0x81);

    } else {

        put_byte(pb, 0x01);

    }

    put_be16(pb, 0x4000 + (size)); /* total frame size */

    put_be16(pb, 0x4000 + (size));              /* offset from the start or the end */

#else

    /* full frame */

    write_packet_header(s, size + 6);

    put_byte(pb, 0xc0);

    put_be16(pb, 0x4000 + size); /* total frame size */

    put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */

#endif

    put_byte(pb, stream->nb_frames & 0xff);

    put_buffer(pb, buf, size);

    put_flush_packet(pb);

    stream->nb_frames++;

    return 0;

}

static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)

{

    if (s->streams[pkt->stream_index]->codec->codec_type ==

        CODEC_TYPE_AUDIO)

        return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);

    else

        return rm_write_video(s, pkt->data, pkt->size, pkt->flags);

}

static int rm_write_trailer(AVFormatContext *s)

{

    RMContext *rm = s->priv_data;

    int data_size, index_pos, i;

    ByteIOContext *pb = &s->pb;

    if (!url_is_streamed(&s->pb)) {

        /* end of file: finish to write header */

        index_pos = url_fseek(pb, 0, SEEK_CUR);

        data_size = index_pos - rm->data_pos;

        /* index */

        put_tag(pb, "INDX");

        put_be32(pb, 10 + 10 * s->nb_streams);

        put_be16(pb, 0);

        for(i=0;i<s->nb_streams;i++) {

            put_be32(pb, 0); /* zero indices */

            put_be16(pb, i); /* stream number */

            put_be32(pb, 0); /* next index */

        }

        /* undocumented end header */

        put_be32(pb, 0);

        put_be32(pb, 0);

        url_fseek(pb, 0, SEEK_SET);

        for(i=0;i<s->nb_streams;i++)

            rm->streams[i].total_frames = rm->streams[i].nb_frames;

        rv10_write_header(s, data_size, index_pos);

    } else {

        /* undocumented end header */

        put_be32(pb, 0);

        put_be32(pb, 0);

    }

    put_flush_packet(pb);

    return 0;

}

#endif //CONFIG_MUXERS

/***************************************************/

static void get_str(ByteIOContext *pb, char *buf, int buf_size)

{

    int len, i;

    char *q;

    len = get_be16(pb);

    q = buf;

    for(i=0;i<len;i++) {

        if (i < buf_size - 1)

            *q++ = get_byte(pb);

    }

    *q = '\0';

}

static void get_str8(ByteIOContext *pb, char *buf, int buf_size)

{

    int len, i;

    char *q;

    len = get_byte(pb);

    q = buf;

    for(i=0;i<len;i++) {

        if (i < buf_size - 1)

            *q++ = get_byte(pb);

    }

    *q = '\0';

}

static void rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,

                                      int read_all)

{

    RMContext *rm = s->priv_data;

    ByteIOContext *pb = &s->pb;

    char buf[256];

    uint32_t version;

    int i;

    /* ra type header */

    version = get_be32(pb); /* version */

    if (((version >> 16) & 0xff) == 3) {

        int64_t startpos = url_ftell(pb);

        /* very old version */

        for(i = 0; i < 14; i++)

            get_byte(pb);

        get_str8(pb, s->title, sizeof(s->title));

        get_str8(pb, s->author, sizeof(s->author));

        get_str8(pb, s->copyright, sizeof(s->copyright));

        get_str8(pb, s->comment, sizeof(s->comment));

        if ((startpos + (version & 0xffff)) >= url_ftell(pb) + 2) {

        // fourcc (should always be "lpcJ")

        get_byte(pb);

        get_str8(pb, buf, sizeof(buf));

        }

        // Skip extra header crap (this should never happen)

        if ((startpos + (version & 0xffff)) > url_ftell(pb))

            url_fskip(pb, (version & 0xffff) + startpos - url_ftell(pb));

        st->codec->sample_rate = 8000;

        st->codec->channels = 1;

        st->codec->codec_type = CODEC_TYPE_AUDIO;

        st->codec->codec_id = CODEC_ID_RA_144;

    } else {

        int flavor, sub_packet_h, coded_framesize, sub_packet_size;

        /* old version (4) */

        get_be32(pb); /* .ra4 */

        get_be32(pb); /* data size */

        get_be16(pb); /* version2 */

        get_be32(pb); /* header size */

        flavor= get_be16(pb); /* add codec info / flavor */

        rm->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */

        get_be32(pb); /* ??? */

        get_be32(pb); /* ??? */

        get_be32(pb); /* ??? */

        rm->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */

        st->codec->block_align= get_be16(pb); /* frame size */

        rm->sub_packet_size = sub_packet_size = get_be16(pb); /* sub packet size */

        get_be16(pb); /* ??? */

        if (((version >> 16) & 0xff) == 5) {

            get_be16(pb); get_be16(pb); get_be16(pb); }

        st->codec->sample_rate = get_be16(pb);

        get_be32(pb);

        st->codec->channels = get_be16(pb);

        if (((version >> 16) & 0xff) == 5) {

            get_be32(pb);

            buf[0] = get_byte(pb);

            buf[1] = get_byte(pb);

            buf[2] = get_byte(pb);

            buf[3] = get_byte(pb);

            buf[4] = 0;

        } else {

        get_str8(pb, buf, sizeof(buf)); /* desc */

        get_str8(pb, buf, sizeof(buf)); /* desc */

        }

        st->codec->codec_type = CODEC_TYPE_AUDIO;

        if (!strcmp(buf, "dnet")) {

            st->codec->codec_id = CODEC_ID_AC3;

        } else if (!strcmp(buf, "28_8")) {

            st->codec->codec_id = CODEC_ID_RA_288;

            st->codec->extradata_size= 0;

            rm->audio_framesize = st->codec->block_align;

            st->codec->block_align = coded_framesize;

            rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);

        } else if (!strcmp(buf, "cook")) {

            int codecdata_length, i;

            get_be16(pb); get_byte(pb);

            if (((version >> 16) & 0xff) == 5)

                get_byte(pb);

            codecdata_length = get_be32(pb);

            st->codec->codec_id = CODEC_ID_COOK;

            st->codec->extradata_size= codecdata_length;

            st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

            for(i = 0; i < codecdata_length; i++)

                ((uint8_t*)st->codec->extradata)[i] = get_byte(pb);

            rm->audio_framesize = st->codec->block_align;

            st->codec->block_align = rm->sub_packet_size;

            rm->audiobuf = av_malloc(rm->audio_framesize * sub_packet_h);

        } else {

            st->codec->codec_id = CODEC_ID_NONE;

            pstrcpy(st->codec->codec_name, sizeof(st->codec->codec_name),

                    buf);

        }

        if (read_all) {

            get_byte(pb);

            get_byte(pb);

            get_byte(pb);

            get_str8(pb, s->title, sizeof(s->title));

            get_str8(pb, s->author, sizeof(s->author));

            get_str8(pb, s->copyright, sizeof(s->copyright));

            get_str8(pb, s->comment, sizeof(s->comment));

        }

    }

}

static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)

{

    RMContext *rm = s->priv_data;

    AVStream *st;

    rm->old_format = 1;

    st = av_new_stream(s, 0);

    if (!st)

        goto fail;

    rm_read_audio_stream_info(s, st, 1);

    return 0;

 fail:

    return -1;

}

static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)

{

    RMContext *rm = s->priv_data;

    AVStream *st;

    ByteIOContext *pb = &s->pb;

    unsigned int tag, v;

    int tag_size, size, codec_data_size, i;

    int64_t codec_pos;

    unsigned int h263_hack_version, start_time, duration;

    char buf[128];

    int flags = 0;

    tag = get_le32(pb);

    if (tag == MKTAG('.', 'r', 'a', 0xfd)) {

        /* very old .ra format */

        return rm_read_header_old(s, ap);

    } else if (tag != MKTAG('.', 'R', 'M', 'F')) {

        return AVERROR_IO;

    }

    get_be32(pb); /* header size */

    get_be16(pb);

    get_be32(pb);

    get_be32(pb); /* number of headers */

    for(;;) {

        if (url_feof(pb))

            goto fail;

        tag = get_le32(pb);

        tag_size = get_be32(pb);

        get_be16(pb);

#if 0

        printf("tag=%c%c%c%c (%08x) size=%d\n",

               (tag) & 0xff,

               (tag >> 8) & 0xff,

               (tag >> 16) & 0xff,

               (tag >> 24) & 0xff,

               tag,

               tag_size);

#endif

        if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))

            goto fail;

        switch(tag) {

        case MKTAG('P', 'R', 'O', 'P'):

            /* file header */

            get_be32(pb); /* max bit rate */

            get_be32(pb); /* avg bit rate */

            get_be32(pb); /* max packet size */

            get_be32(pb); /* avg packet size */

            get_be32(pb); /* nb packets */

            get_be32(pb); /* duration */

            get_be32(pb); /* preroll */

            get_be32(pb); /* index offset */

            get_be32(pb); /* data offset */

            get_be16(pb); /* nb streams */

            flags = get_be16(pb); /* flags */

            break;

        case MKTAG('C', 'O', 'N', 'T'):

            get_str(pb, s->title, sizeof(s->title));

            get_str(pb, s->author, sizeof(s->author));

            get_str(pb, s->copyright, sizeof(s->copyright));

            get_str(pb, s->comment, sizeof(s->comment));

            break;

        case MKTAG('M', 'D', 'P', 'R'):

            st = av_new_stream(s, 0);

            if (!st)

                goto fail;

            st->id = get_be16(pb);

            get_be32(pb); /* max bit rate */

            st->codec->bit_rate = get_be32(pb); /* bit rate */

            get_be32(pb); /* max packet size */

            get_be32(pb); /* avg packet size */

            start_time = get_be32(pb); /* start time */

            get_be32(pb); /* preroll */

            duration = get_be32(pb); /* duration */

            st->start_time = start_time;

            st->duration = duration;

            get_str8(pb, buf, sizeof(buf)); /* desc */

            get_str8(pb, buf, sizeof(buf)); /* mimetype */

            codec_data_size = get_be32(pb);

            codec_pos = url_ftell(pb);

            st->codec->codec_type = CODEC_TYPE_DATA;

            av_set_pts_info(st, 64, 1, 1000);

            v = get_be32(pb);

            if (v == MKTAG(0xfd, 'a', 'r', '.')) {

                /* ra type header */

                rm_read_audio_stream_info(s, st, 0);

            } else {

                int fps, fps2;

                if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {

                fail1:

                    av_log(st->codec, AV_LOG_ERROR, "Unsupported video codec\n");

                    goto skip;

                }

                st->codec->codec_tag = get_le32(pb);

//                av_log(NULL, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));

                if (   st->codec->codec_tag != MKTAG('R', 'V', '1', '0')

                    && st->codec->codec_tag != MKTAG('R', 'V', '2', '0')

                    && st->codec->codec_tag != MKTAG('R', 'V', '3', '0')

                    && st->codec->codec_tag != MKTAG('R', 'V', '4', '0'))

                    goto fail1;

                st->codec->width = get_be16(pb);

                st->codec->height = get_be16(pb);

                st->codec->time_base.num= 1;

                fps= get_be16(pb);

                st->codec->codec_type = CODEC_TYPE_VIDEO;

                get_be32(pb);

                fps2= get_be16(pb);

                get_be16(pb);

                st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);

                st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);

                get_buffer(pb, st->codec->extradata, st->codec->extradata_size);

//                av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);

                st->codec->time_base.den = fps * st->codec->time_base.num;

                /* modification of h263 codec version (!) */

#ifdef WORDS_BIGENDIAN

                h263_hack_version = ((uint32_t*)st->codec->extradata)[1];

#else

                h263_hack_version = bswap_32(((uint32_t*)st->codec->extradata)[1]);

#endif

                st->codec->sub_id = h263_hack_version;

                switch((h263_hack_version>>28)){

                case 1: st->codec->codec_id = CODEC_ID_RV10; break;

                case 2: st->codec->codec_id = CODEC_ID_RV20; break;

                case 3: st->codec->codec_id = CODEC_ID_RV30; break;

                case 4: st->codec->codec_id = CODEC_ID_RV40; break;

                default: goto fail1;

                }

            }

skip:

            /* skip codec info */

            size = url_ftell(pb) - codec_pos;

            url_fskip(pb, codec_data_size - size);

            break;

        case MKTAG('D', 'A', 'T', 'A'):

            goto header_end;

        default:

            /* unknown tag: skip it */

            url_fskip(pb, tag_size - 10);

            break;

        }

    }

 header_end:

    rm->nb_packets = get_be32(pb); /* number of packets */

    if (!rm->nb_packets && (flags & 4))

        rm->nb_packets = 3600 * 25;

    get_be32(pb); /* next data header */

    return 0;

 fail:

    for(i=0;i<s->nb_streams;i++) {

        av_free(s->streams[i]);

    }

    return AVERROR_IO;

}

static int get_num(ByteIOContext *pb, int *len)

{

    int n, n1;

    n = get_be16(pb);

    (*len)-=2;

    if (n >= 0x4000) {

        return n - 0x4000;

    } else {

        n1 = get_be16(pb);

        (*len)-=2;

        return (n << 16) | n1;

    }

}

/* multiple of 20 bytes for ra144 (ugly) */

#define RAW_PACKET_SIZE 1000

static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){

    RMContext *rm = s->priv_data;

    ByteIOContext *pb = &s->pb;

    int len, num, res, i;

    AVStream *st;

    uint32_t state=0xFFFFFFFF;

    while(!url_feof(pb)){

        *pos= url_ftell(pb);

        if(rm->remaining_len > 0){

            num= rm->current_stream;

            len= rm->remaining_len;

            *timestamp = AV_NOPTS_VALUE;

            *flags= 0;

        }else{

            state= (state<<8) + get_byte(pb);

            if(state == MKBETAG('I', 'N', 'D', 'X')){

                len = get_be16(pb) - 6;

                if(len<0)

                    continue;

                goto skip;

            }

            if(state > (unsigned)0xFFFF || state < 12)

                continue;

            len=state;

            state= 0xFFFFFFFF;

            num = get_be16(pb);

            *timestamp = get_be32(pb);

            res= get_byte(pb); /* reserved */

            *flags = get_byte(pb); /* flags */

            len -= 12;

        }

        for(i=0;i<s->nb_streams;i++) {

            st = s->streams[i];

            if (num == st->id)

                break;

        }

        if (i == s->nb_streams) {

skip:

            /* skip packet if unknown number */

            url_fskip(pb, len);

            rm->remaining_len -= len;

            continue;

        }

        *stream_index= i;

        return len;

    }

    return -1;

}

static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)

{

    RMContext *rm = s->priv_data;

    ByteIOContext *pb = &s->pb;

    AVStream *st;

    int i, len, tmp, j;

    int64_t timestamp, pos;

    uint8_t *ptr;

    int flags;

    if (rm->audio_pkt_cnt) {

        // If there are queued audio packet return them first

        st = s->streams[rm->audio_stream_num];

        av_new_packet(pkt, st->codec->block_align);

        memcpy(pkt->data, rm->audiobuf + st->codec->block_align *

               (rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),

               st->codec->block_align);

        rm->audio_pkt_cnt--;

        pkt->flags = 0;

        pkt->stream_index = rm->audio_stream_num;

    } else if (rm->old_format) {

        st = s->streams[0];

        if (st->codec->codec_id == CODEC_ID_RA_288) {

            int x, y;

            for (y = 0; y < rm->sub_packet_h; y++)

                for (x = 0; x < rm->sub_packet_h/2; x++)

                    if (get_buffer(pb, rm->audiobuf+x*2*rm->audio_framesize+y*rm->coded_framesize, rm->coded_framesize) <= 0)

                        return AVERROR_IO;

            rm->audio_stream_num = 0;

            rm->audio_pkt_cnt = rm->sub_packet_h * rm->audio_framesize / st->codec->block_align - 1;

            // Release first audio packet

            av_new_packet(pkt, st->codec->block_align);

            memcpy(pkt->data, rm->audiobuf, st->codec->block_align);

            pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe

            pkt->stream_index = 0;

        } else {

            /* just read raw bytes */

            len = RAW_PACKET_SIZE;

            len= av_get_packet(pb, pkt, len);

            pkt->stream_index = 0;

            if (len <= 0) {

                return AVERROR_IO;

            }

            pkt->size = len;

        }

    } else {

        int seq=1;

resync:

        len=sync(s, &timestamp, &flags, &i, &pos);

        if(len<0)

            return AVERROR_IO;

        st = s->streams[i];

        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

            int h, pic_num, len2, pos;

            h= get_byte(pb); len--;

            if(!(h & 0x40)){

                seq = get_byte(pb); len--;

            }

            if((h & 0xc0) == 0x40){

                len2= pos= 0;

            }else{

                len2 = get_num(pb, &len);

                pos = get_num(pb, &len);

            }

            /* picture number */

            pic_num= get_byte(pb); len--;

            rm->remaining_len= len;

            rm->current_stream= st->id;

//            av_log(NULL, AV_LOG_DEBUG, "%X len:%d pos:%d len2:%d pic_num:%d\n",h, len, pos, len2, pic_num);

            if(len2 && len2<len)

                len=len2;

            rm->remaining_len-= len;

            av_get_packet(pb, pkt, len);

        }

        if (st->codec->codec_type == CODEC_TYPE_AUDIO) {

            if ((st->codec->codec_id == CODEC_ID_RA_288) ||

                (st->codec->codec_id == CODEC_ID_COOK)) {

                int x;

                int sps = rm->sub_packet_size;

                int cfs = rm->coded_framesize;

                int h = rm->sub_packet_h;

                int y = rm->sub_packet_cnt;

                int w = rm->audio_framesize;

                if (flags & 2)

                    y = rm->sub_packet_cnt = 0;

                if (!y)

                    rm->audiotimestamp = timestamp;

                switch(st->codec->codec_id) {

                    case CODEC_ID_RA_288:

                        for (x = 0; x < h/2; x++)

                            get_buffer(pb, rm->audiobuf+x*2*w+y*cfs, cfs);

                        break;

                    case CODEC_ID_COOK:

                        for (x = 0; x < w/sps; x++)

                            get_buffer(pb, rm->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);

                        break;

                }

                if (++(rm->sub_packet_cnt) < h)

                    goto resync;

                else {

                    rm->sub_packet_cnt = 0;

                    rm->audio_stream_num = i;

                    rm->audio_pkt_cnt = h * w / st->codec->block_align - 1;

                    // Release first audio packet

                    av_new_packet(pkt, st->codec->block_align);

                    memcpy(pkt->data, rm->audiobuf, st->codec->block_align);

                    timestamp = rm->audiotimestamp;

                    flags = 2; // Mark first packet as keyframe

                }

            } else

                av_get_packet(pb, pkt, len);

        }

        if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))

           || st->discard >= AVDISCARD_ALL){

            av_free_packet(pkt);

            goto resync;

        }

        pkt->stream_index = i;

#if 0

        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

            if(st->codec->codec_id == CODEC_ID_RV20){

                int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);

                av_log(NULL, AV_LOG_DEBUG, "%d %Ld %d\n", timestamp, timestamp*512LL/25, seq);

                seq |= (timestamp&~0x3FFF);

                if(seq - timestamp >  0x2000) seq -= 0x4000;

                if(seq - timestamp < -0x2000) seq += 0x4000;

            }

        }

#endif

        pkt->pts= timestamp;

        if(flags&2){

            pkt->flags |= PKT_FLAG_KEY;

            if((seq&0x7F) == 1)

                av_add_index_entry(st, pos, timestamp, 0, AVINDEX_KEYFRAME);

        }

    }

    /* for AC3, needs to swap bytes */

    if (st->codec->codec_id == CODEC_ID_AC3) {

        ptr = pkt->data;

        for(j=0;j<len;j+=2) {

            tmp = ptr[0];

            ptr[0] = ptr[1];

            ptr[1] = tmp;

                ptr += 2;

        }

    }

    return 0;

}

static int rm_read_close(AVFormatContext *s)

{

    RMContext *rm = s->priv_data;

    av_free(rm->audiobuf);

    return 0;

}

static int rm_probe(AVProbeData *p)

{

    /* check file header */

    if (p->buf_size <= 32)

        return 0;

    if ((p->buf[0] == '.' && p->buf[1] == 'R' &&

         p->buf[2] == 'M' && p->buf[3] == 'F' &&

         p->buf[4] == 0 && p->buf[5] == 0) ||

        (p->buf[0] == '.' && p->buf[1] == 'r' &&

         p->buf[2] == 'a' && p->buf[3] == 0xfd))

        return AVPROBE_SCORE_MAX;

    else

        return 0;

}

static int64_t rm_read_dts(AVFormatContext *s, int stream_index,

                               int64_t *ppos, int64_t pos_limit)

{

    RMContext *rm = s->priv_data;

    int64_t pos, dts;

    int stream_index2, flags, len, h;

    pos = *ppos;

    if(rm->old_format)

        return AV_NOPTS_VALUE;

    url_fseek(&s->pb, pos, SEEK_SET);

    rm->remaining_len=0;

    for(;;){

        int seq=1;

        AVStream *st;

        len=sync(s, &dts, &flags, &stream_index2, &pos);

        if(len<0)

            return AV_NOPTS_VALUE;

        st = s->streams[stream_index2];

        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {

            h= get_byte(&s->pb); len--;

            if(!(h & 0x40)){

                seq = get_byte(&s->pb); len--;

            }

        }

        if((flags&2) && (seq&0x7F) == 1){

//            av_log(s, AV_LOG_DEBUG, "%d %d-%d %Ld %d\n", flags, stream_index2, stream_index, dts, seq);

            av_add_index_entry(st, pos, dts, 0, AVINDEX_KEYFRAME);

            if(stream_index2 == stream_index)

                break;

        }

        url_fskip(&s->pb, len);

    }

    *ppos = pos;

    return dts;

}

static AVInputFormat rm_iformat = {

    "rm",

    "rm format",

    sizeof(RMContext),

    rm_probe,

    rm_read_header,

    rm_read_packet,

    rm_read_close,

    NULL,

    rm_read_dts,

};

#ifdef CONFIG_MUXERS

static AVOutputFormat rm_oformat = {

    "rm",

    "rm format",

    "application/vnd.rn-realmedia",

    "rm,ra",

    sizeof(RMContext),

    CODEC_ID_AC3,

    CODEC_ID_RV10,

    rm_write_header,

    rm_write_packet,

    rm_write_trailer,

};

#endif //CONFIG_MUXERS

int rm_init(void)

{

    av_register_input_format(&rm_iformat);

#ifdef CONFIG_MUXERS

    av_register_output_format(&rm_oformat);

#endif //CONFIG_MUXERS

    return 0;

}