chasing indexing error

1 files changed, 0 insertions, 1066 deletions

diff --git a/ffmpeg/libavformat/rmdec.c b/ffmpeg/libavformat/rmdec.c
deleted file mode 100644
index 8feef54..0000000
--- a/ffmpeg/libavformat/rmdec.c
+++ /dev/null
@@ -1,1066 +0,0 @@
-/*
- * "Real" 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 "libavutil/avassert.h"
-#include "libavutil/avstring.h"
-#include "libavutil/channel_layout.h"
-#include "libavutil/internal.h"
-#include "libavutil/intreadwrite.h"
-#include "libavutil/dict.h"
-#include "avformat.h"
-#include "avio_internal.h"
-#include "internal.h"
-#include "rmsipr.h"
-#include "rm.h"
-
-#define DEINT_ID_GENR MKTAG('g', 'e', 'n', 'r') ///< interleaving for Cooker/ATRAC
-#define DEINT_ID_INT0 MKTAG('I', 'n', 't', '0') ///< no interleaving needed
-#define DEINT_ID_INT4 MKTAG('I', 'n', 't', '4') ///< interleaving for 28.8
-#define DEINT_ID_SIPR MKTAG('s', 'i', 'p', 'r') ///< interleaving for Sipro
-#define DEINT_ID_VBRF MKTAG('v', 'b', 'r', 'f') ///< VBR case for AAC
-#define DEINT_ID_VBRS MKTAG('v', 'b', 'r', 's') ///< VBR case for AAC
-
-struct RMStream {
-    AVPacket pkt;      ///< place to store merged video frame / reordered audio data
-    int videobufsize;  ///< current assembled frame size
-    int videobufpos;   ///< position for the next slice in the video buffer
-    int curpic_num;    ///< picture number of current frame
-    int cur_slice, slices;
-    int64_t pktpos;    ///< first slice position in file
-    /// Audio descrambling matrix parameters
-    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_framesize; /// Audio frame size from container
-    int sub_packet_lengths[16]; /// Length of each subpacket
-    int32_t deint_id;  ///< deinterleaver used in audio stream
-};
-
-typedef struct {
-    int nb_packets;
-    int old_format;
-    int current_stream;
-    int remaining_len;
-    int audio_stream_num; ///< Stream number for audio packets
-    int audio_pkt_cnt; ///< Output packet counter
-} RMDemuxContext;
-
-static inline void get_strl(AVIOContext *pb, char *buf, int buf_size, int len)
-{
-    int i;
-    char *q, r;
-
-    q = buf;
-    for(i=0;i<len;i++) {
-        r = avio_r8(pb);
-        if (i < buf_size - 1)
-            *q++ = r;
-    }
-    if (buf_size > 0) *q = '\0';
-}
-
-static void get_str8(AVIOContext *pb, char *buf, int buf_size)
-{
-    get_strl(pb, buf, buf_size, avio_r8(pb));
-}
-
-static int rm_read_extradata(AVIOContext *pb, AVCodecContext *avctx, unsigned size)
-{
-    if (size >= 1<<24)
-        return -1;
-    if (ff_get_extradata(avctx, pb, size) < 0)
-        return AVERROR(ENOMEM);
-    return 0;
-}
-
-static void rm_read_metadata(AVFormatContext *s, AVIOContext *pb, int wide)
-{
-    char buf[1024];
-    int i;
-
-    for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
-        int len = wide ? avio_rb16(pb) : avio_r8(pb);
-        get_strl(pb, buf, sizeof(buf), len);
-        av_dict_set(&s->metadata, ff_rm_metadata[i], buf, 0);
-    }
-}
-
-RMStream *ff_rm_alloc_rmstream (void)
-{
-    RMStream *rms = av_mallocz(sizeof(RMStream));
-    rms->curpic_num = -1;
-    return rms;
-}
-
-void ff_rm_free_rmstream (RMStream *rms)
-{
-    av_free_packet(&rms->pkt);
-}
-
-static int rm_read_audio_stream_info(AVFormatContext *s, AVIOContext *pb,
-                                     AVStream *st, RMStream *ast, int read_all)
-{
-    char buf[256];
-    uint32_t version;
-    int ret;
-
-    /* ra type header */
-    version = avio_rb16(pb); /* version */
-    if (version == 3) {
-        unsigned bytes_per_minute;
-        int header_size = avio_rb16(pb);
-        int64_t startpos = avio_tell(pb);
-        avio_skip(pb, 8);
-        bytes_per_minute = avio_rb16(pb);
-        avio_skip(pb, 4);
-        rm_read_metadata(s, pb, 0);
-        if ((startpos + header_size) >= avio_tell(pb) + 2) {
-            // fourcc (should always be "lpcJ")
-            avio_r8(pb);
-            get_str8(pb, buf, sizeof(buf));
-        }
-        // Skip extra header crap (this should never happen)
-        if ((startpos + header_size) > avio_tell(pb))
-            avio_skip(pb, header_size + startpos - avio_tell(pb));
-        if (bytes_per_minute)
-            st->codec->bit_rate = 8LL * bytes_per_minute / 60;
-        st->codec->sample_rate = 8000;
-        st->codec->channels = 1;
-        st->codec->channel_layout = AV_CH_LAYOUT_MONO;
-        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
-        st->codec->codec_id = AV_CODEC_ID_RA_144;
-        ast->deint_id = DEINT_ID_INT0;
-    } else {
-        int flavor, sub_packet_h, coded_framesize, sub_packet_size;
-        int codecdata_length;
-        unsigned bytes_per_minute;
-        /* old version (4) */
-        avio_skip(pb, 2); /* unused */
-        avio_rb32(pb); /* .ra4 */
-        avio_rb32(pb); /* data size */
-        avio_rb16(pb); /* version2 */
-        avio_rb32(pb); /* header size */
-        flavor= avio_rb16(pb); /* add codec info / flavor */
-        ast->coded_framesize = coded_framesize = avio_rb32(pb); /* coded frame size */
-        avio_rb32(pb); /* ??? */
-        bytes_per_minute = avio_rb32(pb);
-        if (version == 4) {
-            if (bytes_per_minute)
-                st->codec->bit_rate = 8LL * bytes_per_minute / 60;
-        }
-        avio_rb32(pb); /* ??? */
-        ast->sub_packet_h = sub_packet_h = avio_rb16(pb); /* 1 */
-        st->codec->block_align= avio_rb16(pb); /* frame size */
-        ast->sub_packet_size = sub_packet_size = avio_rb16(pb); /* sub packet size */
-        avio_rb16(pb); /* ??? */
-        if (version == 5) {
-            avio_rb16(pb); avio_rb16(pb); avio_rb16(pb);
-        }
-        st->codec->sample_rate = avio_rb16(pb);
-        avio_rb32(pb);
-        st->codec->channels = avio_rb16(pb);
-        if (version == 5) {
-            ast->deint_id = avio_rl32(pb);
-            avio_read(pb, buf, 4);
-            buf[4] = 0;
-        } else {
-            AV_WL32(buf, 0);
-            get_str8(pb, buf, sizeof(buf)); /* desc */
-            ast->deint_id = AV_RL32(buf);
-            get_str8(pb, buf, sizeof(buf)); /* desc */
-        }
-        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
-        st->codec->codec_tag  = AV_RL32(buf);
-        st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
-                                                st->codec->codec_tag);
-
-        switch (st->codec->codec_id) {
-        case AV_CODEC_ID_AC3:
-            st->need_parsing = AVSTREAM_PARSE_FULL;
-            break;
-        case AV_CODEC_ID_RA_288:
-            st->codec->extradata_size= 0;
-            ast->audio_framesize = st->codec->block_align;
-            st->codec->block_align = coded_framesize;
-            break;
-        case AV_CODEC_ID_COOK:
-            st->need_parsing = AVSTREAM_PARSE_HEADERS;
-        case AV_CODEC_ID_ATRAC3:
-        case AV_CODEC_ID_SIPR:
-            if (read_all) {
-                codecdata_length = 0;
-            } else {
-                avio_rb16(pb); avio_r8(pb);
-                if (version == 5)
-                    avio_r8(pb);
-                codecdata_length = avio_rb32(pb);
-                if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
-                    av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
-                    return -1;
-                }
-            }
-
-            ast->audio_framesize = st->codec->block_align;
-            if (st->codec->codec_id == AV_CODEC_ID_SIPR) {
-                if (flavor > 3) {
-                    av_log(s, AV_LOG_ERROR, "bad SIPR file flavor %d\n",
-                           flavor);
-                    return -1;
-                }
-                st->codec->block_align = ff_sipr_subpk_size[flavor];
-            } else {
-                if(sub_packet_size <= 0){
-                    av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
-                    return -1;
-                }
-                st->codec->block_align = ast->sub_packet_size;
-            }
-            if ((ret = rm_read_extradata(pb, st->codec, codecdata_length)) < 0)
-                return ret;
-
-            break;
-        case AV_CODEC_ID_AAC:
-            avio_rb16(pb); avio_r8(pb);
-            if (version == 5)
-                avio_r8(pb);
-            codecdata_length = avio_rb32(pb);
-            if(codecdata_length + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)codecdata_length){
-                av_log(s, AV_LOG_ERROR, "codecdata_length too large\n");
-                return -1;
-            }
-            if (codecdata_length >= 1) {
-                avio_r8(pb);
-                if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
-                    return ret;
-            }
-            break;
-        default:
-            av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
-        }
-        switch (ast->deint_id) {
-        case DEINT_ID_INT4:
-            if (ast->coded_framesize > ast->audio_framesize ||
-                sub_packet_h <= 1 ||
-                ast->coded_framesize * sub_packet_h > (2 + (sub_packet_h & 1)) * ast->audio_framesize)
-                return AVERROR_INVALIDDATA;
-            if (ast->coded_framesize * sub_packet_h != 2*ast->audio_framesize) {
-                avpriv_request_sample(s, "mismatching interleaver parameters");
-                return AVERROR_INVALIDDATA;
-            }
-            break;
-        case DEINT_ID_GENR:
-            if (ast->sub_packet_size <= 0 ||
-                ast->sub_packet_size > ast->audio_framesize)
-                return AVERROR_INVALIDDATA;
-            break;
-        case DEINT_ID_SIPR:
-        case DEINT_ID_INT0:
-        case DEINT_ID_VBRS:
-        case DEINT_ID_VBRF:
-            break;
-        default:
-            av_log(s, AV_LOG_ERROR, "Unknown interleaver %X\n", ast->deint_id);
-            return AVERROR_INVALIDDATA;
-        }
-        if (ast->deint_id == DEINT_ID_INT4 ||
-            ast->deint_id == DEINT_ID_GENR ||
-            ast->deint_id == DEINT_ID_SIPR) {
-            if (st->codec->block_align <= 0 ||
-                ast->audio_framesize * sub_packet_h > (unsigned)INT_MAX ||
-                ast->audio_framesize * sub_packet_h < st->codec->block_align)
-                return AVERROR_INVALIDDATA;
-            if (av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h) < 0)
-                return AVERROR(ENOMEM);
-        }
-
-        if (read_all) {
-            avio_r8(pb);
-            avio_r8(pb);
-            avio_r8(pb);
-            rm_read_metadata(s, pb, 0);
-        }
-    }
-    return 0;
-}
-
-int
-ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
-                           AVStream *st, RMStream *rst, int codec_data_size, const uint8_t *mime)
-{
-    unsigned int v;
-    int size;
-    int64_t codec_pos;
-    int ret;
-
-    avpriv_set_pts_info(st, 64, 1, 1000);
-    codec_pos = avio_tell(pb);
-    v = avio_rb32(pb);
-    if (v == MKTAG(0xfd, 'a', 'r', '.')) {
-        /* ra type header */
-        if (rm_read_audio_stream_info(s, pb, st, rst, 0))
-            return -1;
-    } else if (v == MKBETAG('L', 'S', 'D', ':')) {
-        avio_seek(pb, -4, SEEK_CUR);
-        if ((ret = rm_read_extradata(pb, st->codec, codec_data_size)) < 0)
-            return ret;
-
-        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
-        st->codec->codec_tag  = AV_RL32(st->codec->extradata);
-        st->codec->codec_id   = ff_codec_get_id(ff_rm_codec_tags,
-                                                st->codec->codec_tag);
-    } else if(mime && !strcmp(mime, "logical-fileinfo")){
-        int stream_count, rule_count, property_count, i;
-        ff_free_stream(s, st);
-        if (avio_rb16(pb) != 0) {
-            av_log(s, AV_LOG_WARNING, "Unsupported version\n");
-            goto skip;
-        }
-        stream_count = avio_rb16(pb);
-        avio_skip(pb, 6*stream_count);
-        rule_count = avio_rb16(pb);
-        avio_skip(pb, 2*rule_count);
-        property_count = avio_rb16(pb);
-        for(i=0; i<property_count; i++){
-            uint8_t name[128], val[128];
-            avio_rb32(pb);
-            if (avio_rb16(pb) != 0) {
-                av_log(s, AV_LOG_WARNING, "Unsupported Name value property version\n");
-                goto skip; //FIXME skip just this one
-            }
-            get_str8(pb, name, sizeof(name));
-            switch(avio_rb32(pb)) {
-            case 2: get_strl(pb, val, sizeof(val), avio_rb16(pb));
-                av_dict_set(&s->metadata, name, val, 0);
-                break;
-            default: avio_skip(pb, avio_rb16(pb));
-            }
-        }
-    } else {
-        int fps;
-        if (avio_rl32(pb) != MKTAG('V', 'I', 'D', 'O')) {
-        fail1:
-            av_log(s, AV_LOG_WARNING, "Unsupported stream type %08x\n", v);
-            goto skip;
-        }
-        st->codec->codec_tag = avio_rl32(pb);
-        st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
-                                               st->codec->codec_tag);
-        av_dlog(s, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
-        if (st->codec->codec_id == AV_CODEC_ID_NONE)
-            goto fail1;
-        st->codec->width  = avio_rb16(pb);
-        st->codec->height = avio_rb16(pb);
-        avio_skip(pb, 2); // looks like bits per sample
-        avio_skip(pb, 4); // always zero?
-        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
-        st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
-        fps = avio_rb32(pb);
-
-        if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
-            return ret;
-
-        if (fps > 0) {
-            av_reduce(&st->avg_frame_rate.den, &st->avg_frame_rate.num,
-                      0x10000, fps, (1 << 30) - 1);
-#if FF_API_R_FRAME_RATE
-            st->r_frame_rate = st->avg_frame_rate;
-#endif
-        } else if (s->error_recognition & AV_EF_EXPLODE) {
-            av_log(s, AV_LOG_ERROR, "Invalid framerate\n");
-            return AVERROR_INVALIDDATA;
-        }
-    }
-
-skip:
-    /* skip codec info */
-    size = avio_tell(pb) - codec_pos;
-    avio_skip(pb, codec_data_size - size);
-
-    return 0;
-}
-
-/** this function assumes that the demuxer has already seeked to the start
- * of the INDX chunk, and will bail out if not. */
-static int rm_read_index(AVFormatContext *s)
-{
-    AVIOContext *pb = s->pb;
-    unsigned int size, n_pkts, str_id, next_off, n, pos, pts;
-    AVStream *st;
-
-    do {
-        if (avio_rl32(pb) != MKTAG('I','N','D','X'))
-            return -1;
-        size     = avio_rb32(pb);
-        if (size < 20)
-            return -1;
-        avio_skip(pb, 2);
-        n_pkts   = avio_rb32(pb);
-        str_id   = avio_rb16(pb);
-        next_off = avio_rb32(pb);
-        for (n = 0; n < s->nb_streams; n++)
-            if (s->streams[n]->id == str_id) {
-                st = s->streams[n];
-                break;
-            }
-        if (n == s->nb_streams) {
-            av_log(s, AV_LOG_ERROR,
-                   "Invalid stream index %d for index at pos %"PRId64"\n",
-                   str_id, avio_tell(pb));
-            goto skip;
-        } else if ((avio_size(pb) - avio_tell(pb)) / 14 < n_pkts) {
-            av_log(s, AV_LOG_ERROR,
-                   "Nr. of packets in packet index for stream index %d "
-                   "exceeds filesize (%"PRId64" at %"PRId64" = %"PRId64")\n",
-                   str_id, avio_size(pb), avio_tell(pb),
-                   (avio_size(pb) - avio_tell(pb)) / 14);
-            goto skip;
-        }
-
-        for (n = 0; n < n_pkts; n++) {
-            avio_skip(pb, 2);
-            pts = avio_rb32(pb);
-            pos = avio_rb32(pb);
-            avio_skip(pb, 4); /* packet no. */
-
-            av_add_index_entry(st, pos, pts, 0, 0, AVINDEX_KEYFRAME);
-        }
-
-skip:
-        if (next_off && avio_tell(pb) < next_off &&
-            avio_seek(pb, next_off, SEEK_SET) < 0) {
-            av_log(s, AV_LOG_ERROR,
-                   "Non-linear index detected, not supported\n");
-            return -1;
-        }
-    } while (next_off);
-
-    return 0;
-}
-
-static int rm_read_header_old(AVFormatContext *s)
-{
-    RMDemuxContext *rm = s->priv_data;
-    AVStream *st;
-
-    rm->old_format = 1;
-    st = avformat_new_stream(s, NULL);
-    if (!st)
-        return -1;
-    st->priv_data = ff_rm_alloc_rmstream();
-    return rm_read_audio_stream_info(s, s->pb, st, st->priv_data, 1);
-}
-
-static int rm_read_header(AVFormatContext *s)
-{
-    RMDemuxContext *rm = s->priv_data;
-    AVStream *st;
-    AVIOContext *pb = s->pb;
-    unsigned int tag;
-    int tag_size;
-    unsigned int start_time, duration;
-    unsigned int data_off = 0, indx_off = 0;
-    char buf[128], mime[128];
-    int flags = 0;
-
-    tag = avio_rl32(pb);
-    if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
-        /* very old .ra format */
-        return rm_read_header_old(s);
-    } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
-        return AVERROR(EIO);
-    }
-
-    tag_size = avio_rb32(pb);
-    avio_skip(pb, tag_size - 8);
-
-    for(;;) {
-        if (url_feof(pb))
-            return -1;
-        tag = avio_rl32(pb);
-        tag_size = avio_rb32(pb);
-        avio_rb16(pb);
-        av_dlog(s, "tag=%c%c%c%c (%08x) size=%d\n",
-                (tag      ) & 0xff,
-                (tag >>  8) & 0xff,
-                (tag >> 16) & 0xff,
-                (tag >> 24) & 0xff,
-                tag,
-                tag_size);
-        if (tag_size < 10 && tag != MKTAG('D', 'A', 'T', 'A'))
-            return -1;
-        switch(tag) {
-        case MKTAG('P', 'R', 'O', 'P'):
-            /* file header */
-            avio_rb32(pb); /* max bit rate */
-            avio_rb32(pb); /* avg bit rate */
-            avio_rb32(pb); /* max packet size */
-            avio_rb32(pb); /* avg packet size */
-            avio_rb32(pb); /* nb packets */
-            duration = avio_rb32(pb); /* duration */
-            s->duration = av_rescale(duration, AV_TIME_BASE, 1000);
-            avio_rb32(pb); /* preroll */
-            indx_off = avio_rb32(pb); /* index offset */
-            data_off = avio_rb32(pb); /* data offset */
-            avio_rb16(pb); /* nb streams */
-            flags = avio_rb16(pb); /* flags */
-            break;
-        case MKTAG('C', 'O', 'N', 'T'):
-            rm_read_metadata(s, pb, 1);
-            break;
-        case MKTAG('M', 'D', 'P', 'R'):
-            st = avformat_new_stream(s, NULL);
-            if (!st)
-                return AVERROR(ENOMEM);
-            st->id = avio_rb16(pb);
-            avio_rb32(pb); /* max bit rate */
-            st->codec->bit_rate = avio_rb32(pb); /* bit rate */
-            avio_rb32(pb); /* max packet size */
-            avio_rb32(pb); /* avg packet size */
-            start_time = avio_rb32(pb); /* start time */
-            avio_rb32(pb); /* preroll */
-            duration = avio_rb32(pb); /* duration */
-            st->start_time = start_time;
-            st->duration = duration;
-            if(duration>0)
-                s->duration = AV_NOPTS_VALUE;
-            get_str8(pb, buf, sizeof(buf)); /* desc */
-            get_str8(pb, mime, sizeof(mime)); /* mimetype */
-            st->codec->codec_type = AVMEDIA_TYPE_DATA;
-            st->priv_data = ff_rm_alloc_rmstream();
-            if (ff_rm_read_mdpr_codecdata(s, s->pb, st, st->priv_data,
-                                          avio_rb32(pb), mime) < 0)
-                return -1;
-            break;
-        case MKTAG('D', 'A', 'T', 'A'):
-            goto header_end;
-        default:
-            /* unknown tag: skip it */
-            avio_skip(pb, tag_size - 10);
-            break;
-        }
-    }
- header_end:
-    rm->nb_packets = avio_rb32(pb); /* number of packets */
-    if (!rm->nb_packets && (flags & 4))
-        rm->nb_packets = 3600 * 25;
-    avio_rb32(pb); /* next data header */
-
-    if (!data_off)
-        data_off = avio_tell(pb) - 18;
-    if (indx_off && pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
-        avio_seek(pb, indx_off, SEEK_SET) >= 0) {
-        rm_read_index(s);
-        avio_seek(pb, data_off + 18, SEEK_SET);
-    }
-
-    return 0;
-}
-
-static int get_num(AVIOContext *pb, int *len)
-{
-    int n, n1;
-
-    n = avio_rb16(pb);
-    (*len)-=2;
-    n &= 0x7FFF;
-    if (n >= 0x4000) {
-        return n - 0x4000;
-    } else {
-        n1 = avio_rb16(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){
-    RMDemuxContext *rm = s->priv_data;
-    AVIOContext *pb = s->pb;
-    AVStream *st;
-    uint32_t state=0xFFFFFFFF;
-
-    while(!url_feof(pb)){
-        int len, num, i;
-        *pos= avio_tell(pb) - 3;
-        if(rm->remaining_len > 0){
-            num= rm->current_stream;
-            len= rm->remaining_len;
-            *timestamp = AV_NOPTS_VALUE;
-            *flags= 0;
-        }else{
-            state= (state<<8) + avio_r8(pb);
-
-            if(state == MKBETAG('I', 'N', 'D', 'X')){
-                int n_pkts, expected_len;
-                len = avio_rb32(pb);
-                avio_skip(pb, 2);
-                n_pkts = avio_rb32(pb);
-                expected_len = 20 + n_pkts * 14;
-                if (len == 20)
-                    /* some files don't add index entries to chunk size... */
-                    len = expected_len;
-                else if (len != expected_len)
-                    av_log(s, AV_LOG_WARNING,
-                           "Index size %d (%d pkts) is wrong, should be %d.\n",
-                           len, n_pkts, expected_len);
-                len -= 14; // we already read part of the index header
-                if(len<0)
-                    continue;
-                goto skip;
-            } else if (state == MKBETAG('D','A','T','A')) {
-                av_log(s, AV_LOG_WARNING,
-                       "DATA tag in middle of chunk, file may be broken.\n");
-            }
-
-            if(state > (unsigned)0xFFFF || state <= 12)
-                continue;
-            len=state - 12;
-            state= 0xFFFFFFFF;
-
-            num = avio_rb16(pb);
-            *timestamp = avio_rb32(pb);
-            avio_r8(pb); /* reserved */
-            *flags = avio_r8(pb); /* flags */
-        }
-        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 */
-            avio_skip(pb, len);
-            rm->remaining_len = 0;
-            continue;
-        }
-        *stream_index= i;
-
-        return len;
-    }
-    return -1;
-}
-
-static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
-                                   RMDemuxContext *rm, RMStream *vst,
-                                   AVPacket *pkt, int len, int *pseq,
-                                   int64_t *timestamp)
-{
-    int hdr;
-    int seq = 0, pic_num = 0, len2 = 0, pos = 0; //init to silcense compiler warning
-    int type;
-    int ret;
-
-    hdr = avio_r8(pb); len--;
-    type = hdr >> 6;
-
-    if(type != 3){  // not frame as a part of packet
-        seq = avio_r8(pb); len--;
-    }
-    if(type != 1){  // not whole frame
-        len2 = get_num(pb, &len);
-        pos  = get_num(pb, &len);
-        pic_num = avio_r8(pb); len--;
-    }
-    if(len<0) {
-        av_log(s, AV_LOG_ERROR, "Insufficient data\n");
-        return -1;
-    }
-    rm->remaining_len = len;
-    if(type&1){     // frame, not slice
-        if(type == 3){  // frame as a part of packet
-            len= len2;
-            *timestamp = pos;
-        }
-        if(rm->remaining_len < len) {
-            av_log(s, AV_LOG_ERROR, "Insufficient remaining len\n");
-            return -1;
-        }
-        rm->remaining_len -= len;
-        if(av_new_packet(pkt, len + 9) < 0)
-            return AVERROR(EIO);
-        pkt->data[0] = 0;
-        AV_WL32(pkt->data + 1, 1);
-        AV_WL32(pkt->data + 5, 0);
-        if ((ret = avio_read(pb, pkt->data + 9, len)) != len) {
-            av_free_packet(pkt);
-            av_log(s, AV_LOG_ERROR, "Failed to read %d bytes\n", len);
-            return ret < 0 ? ret : AVERROR(EIO);
-        }
-        return 0;
-    }
-    //now we have to deal with single slice
-
-    *pseq = seq;
-    if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
-        if (len2 > ffio_limit(pb, len2)) {
-            av_log(s, AV_LOG_ERROR, "Impossibly sized packet\n");
-            return AVERROR_INVALIDDATA;
-        }
-        vst->slices = ((hdr & 0x3F) << 1) + 1;
-        vst->videobufsize = len2 + 8*vst->slices + 1;
-        av_free_packet(&vst->pkt); //FIXME this should be output.
-        if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
-            return AVERROR(ENOMEM);
-        memset(vst->pkt.data, 0, vst->pkt.size);
-        vst->videobufpos = 8*vst->slices + 1;
-        vst->cur_slice = 0;
-        vst->curpic_num = pic_num;
-        vst->pktpos = avio_tell(pb);
-    }
-    if(type == 2)
-        len = FFMIN(len, pos);
-
-    if(++vst->cur_slice > vst->slices) {
-        av_log(s, AV_LOG_ERROR, "cur slice %d, too large\n", vst->cur_slice);
-        return 1;
-    }
-    if(!vst->pkt.data)
-        return AVERROR(ENOMEM);
-    AV_WL32(vst->pkt.data - 7 + 8*vst->cur_slice, 1);
-    AV_WL32(vst->pkt.data - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
-    if(vst->videobufpos + len > vst->videobufsize) {
-        av_log(s, AV_LOG_ERROR, "outside videobufsize\n");
-        return 1;
-    }
-    if (avio_read(pb, vst->pkt.data + vst->videobufpos, len) != len)
-        return AVERROR(EIO);
-    vst->videobufpos += len;
-    rm->remaining_len-= len;
-
-    if (type == 2 || vst->videobufpos == vst->videobufsize) {
-        vst->pkt.data[0] = vst->cur_slice-1;
-        *pkt= vst->pkt;
-        vst->pkt.data= NULL;
-        vst->pkt.size= 0;
-        vst->pkt.buf = NULL;
-#if FF_API_DESTRUCT_PACKET
-FF_DISABLE_DEPRECATION_WARNINGS
-        vst->pkt.destruct = NULL;
-FF_ENABLE_DEPRECATION_WARNINGS
-#endif
-        if(vst->slices != vst->cur_slice) //FIXME find out how to set slices correct from the begin
-            memmove(pkt->data + 1 + 8*vst->cur_slice, pkt->data + 1 + 8*vst->slices,
-                vst->videobufpos - 1 - 8*vst->slices);
-        pkt->size = vst->videobufpos + 8*(vst->cur_slice - vst->slices);
-        pkt->pts = AV_NOPTS_VALUE;
-        pkt->pos = vst->pktpos;
-        vst->slices = 0;
-        return 0;
-    }
-
-    return 1;
-}
-
-static inline void
-rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
-{
-    uint8_t *ptr;
-    int j;
-
-    if (st->codec->codec_id == AV_CODEC_ID_AC3) {
-        ptr = pkt->data;
-        for (j=0;j<pkt->size;j+=2) {
-            FFSWAP(int, ptr[0], ptr[1]);
-            ptr += 2;
-        }
-    }
-}
-
-int
-ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
-                    AVStream *st, RMStream *ast, int len, AVPacket *pkt,
-                    int *seq, int flags, int64_t timestamp)
-{
-    RMDemuxContext *rm = s->priv_data;
-    int ret;
-
-    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
-        rm->current_stream= st->id;
-        ret = rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq, &timestamp);
-        if(ret)
-            return ret < 0 ? ret : -1; //got partial frame or error
-    } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
-        if ((ast->deint_id == DEINT_ID_GENR) ||
-            (ast->deint_id == DEINT_ID_INT4) ||
-            (ast->deint_id == DEINT_ID_SIPR)) {
-            int x;
-            int sps = ast->sub_packet_size;
-            int cfs = ast->coded_framesize;
-            int h = ast->sub_packet_h;
-            int y = ast->sub_packet_cnt;
-            int w = ast->audio_framesize;
-
-            if (flags & 2)
-                y = ast->sub_packet_cnt = 0;
-            if (!y)
-                ast->audiotimestamp = timestamp;
-
-            switch (ast->deint_id) {
-                case DEINT_ID_INT4:
-                    for (x = 0; x < h/2; x++)
-                        avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
-                    break;
-                case DEINT_ID_GENR:
-                    for (x = 0; x < w/sps; x++)
-                        avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
-                    break;
-                case DEINT_ID_SIPR:
-                    avio_read(pb, ast->pkt.data + y * w, w);
-                    break;
-            }
-
-            if (++(ast->sub_packet_cnt) < h)
-                return -1;
-            if (ast->deint_id == DEINT_ID_SIPR)
-                ff_rm_reorder_sipr_data(ast->pkt.data, h, w);
-
-             ast->sub_packet_cnt = 0;
-             rm->audio_stream_num = st->index;
-             rm->audio_pkt_cnt = h * w / st->codec->block_align;
-        } else if ((ast->deint_id == DEINT_ID_VBRF) ||
-                   (ast->deint_id == DEINT_ID_VBRS)) {
-            int x;
-            rm->audio_stream_num = st->index;
-            ast->sub_packet_cnt = (avio_rb16(pb) & 0xf0) >> 4;
-            if (ast->sub_packet_cnt) {
-                for (x = 0; x < ast->sub_packet_cnt; x++)
-                    ast->sub_packet_lengths[x] = avio_rb16(pb);
-                rm->audio_pkt_cnt = ast->sub_packet_cnt;
-                ast->audiotimestamp = timestamp;
-            } else
-                return -1;
-        } else {
-            av_get_packet(pb, pkt, len);
-            rm_ac3_swap_bytes(st, pkt);
-        }
-    } else
-        av_get_packet(pb, pkt, len);
-
-    pkt->stream_index = st->index;
-
-#if 0
-    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
-        if(st->codec->codec_id == AV_CODEC_ID_RV20){
-            int seq= 128*(pkt->data[2]&0x7F) + (pkt->data[3]>>1);
-            av_log(s, AV_LOG_DEBUG, "%d %"PRId64" %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 |= AV_PKT_FLAG_KEY;
-
-    return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
-}
-
-int
-ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
-                      AVStream *st, RMStream *ast, AVPacket *pkt)
-{
-    RMDemuxContext *rm = s->priv_data;
-
-    av_assert0 (rm->audio_pkt_cnt > 0);
-
-    if (ast->deint_id == DEINT_ID_VBRF ||
-        ast->deint_id == DEINT_ID_VBRS)
-        av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
-    else {
-        if(av_new_packet(pkt, st->codec->block_align) < 0)
-            return AVERROR(ENOMEM);
-        memcpy(pkt->data, ast->pkt.data + st->codec->block_align * //FIXME avoid this
-               (ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - rm->audio_pkt_cnt),
-               st->codec->block_align);
-    }
-    rm->audio_pkt_cnt--;
-    if ((pkt->pts = ast->audiotimestamp) != AV_NOPTS_VALUE) {
-        ast->audiotimestamp = AV_NOPTS_VALUE;
-        pkt->flags = AV_PKT_FLAG_KEY;
-    } else
-        pkt->flags = 0;
-    pkt->stream_index = st->index;
-
-    return rm->audio_pkt_cnt;
-}
-
-static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
-{
-    RMDemuxContext *rm = s->priv_data;
-    AVStream *st = NULL; // init to silence compiler warning
-    int i, len, res, seq = 1;
-    int64_t timestamp, pos;
-    int flags;
-
-    for (;;) {
-        if (rm->audio_pkt_cnt) {
-            // If there are queued audio packet return them first
-            st = s->streams[rm->audio_stream_num];
-            res = ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
-            if(res < 0)
-                return res;
-            flags = 0;
-        } else {
-            if (rm->old_format) {
-                RMStream *ast;
-
-                st = s->streams[0];
-                ast = st->priv_data;
-                timestamp = AV_NOPTS_VALUE;
-                len = !ast->audio_framesize ? RAW_PACKET_SIZE :
-                    ast->coded_framesize * ast->sub_packet_h / 2;
-                flags = (seq++ == 1) ? 2 : 0;
-                pos = avio_tell(s->pb);
-            } else {
-                len=sync(s, &timestamp, &flags, &i, &pos);
-                if (len > 0)
-                    st = s->streams[i];
-            }
-
-            if(len<0 || url_feof(s->pb))
-                return AVERROR(EIO);
-
-            res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
-                                      &seq, flags, timestamp);
-            if (res < -1)
-                return res;
-            if((flags&2) && (seq&0x7F) == 1)
-                av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
-            if (res)
-                continue;
-        }
-
-        if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
-           || st->discard >= AVDISCARD_ALL){
-            av_free_packet(pkt);
-        } else
-            break;
-    }
-
-    return 0;
-}
-
-static int rm_read_close(AVFormatContext *s)
-{
-    int i;
-
-    for (i=0;i<s->nb_streams;i++)
-        ff_rm_free_rmstream(s->streams[i]->priv_data);
-
-    return 0;
-}
-
-static int rm_probe(AVProbeData *p)
-{
-    /* check file header */
-    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)
-{
-    RMDemuxContext *rm = s->priv_data;
-    int64_t pos, dts;
-    int stream_index2, flags, len, h;
-
-    pos = *ppos;
-
-    if(rm->old_format)
-        return AV_NOPTS_VALUE;
-
-    if (avio_seek(s->pb, pos, SEEK_SET) < 0)
-        return AV_NOPTS_VALUE;
-
-    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 == AVMEDIA_TYPE_VIDEO) {
-            h= avio_r8(s->pb); len--;
-            if(!(h & 0x40)){
-                seq = avio_r8(s->pb); len--;
-            }
-        }
-
-        if((flags&2) && (seq&0x7F) == 1){
-            av_dlog(s, "%d %d-%d %"PRId64" %d\n",
-                    flags, stream_index2, stream_index, dts, seq);
-            av_add_index_entry(st, pos, dts, 0, 0, AVINDEX_KEYFRAME);
-            if(stream_index2 == stream_index)
-                break;
-        }
-
-        avio_skip(s->pb, len);
-    }
-    *ppos = pos;
-    return dts;
-}
-
-static int rm_read_seek(AVFormatContext *s, int stream_index,
-                        int64_t pts, int flags)
-{
-    RMDemuxContext *rm = s->priv_data;
-
-    if (ff_seek_frame_binary(s, stream_index, pts, flags) < 0)
-        return -1;
-    rm->audio_pkt_cnt = 0;
-    return 0;
-}
-
-
-AVInputFormat ff_rm_demuxer = {
-    .name           = "rm",
-    .long_name      = NULL_IF_CONFIG_SMALL("RealMedia"),
-    .priv_data_size = sizeof(RMDemuxContext),
-    .read_probe     = rm_probe,
-    .read_header    = rm_read_header,
-    .read_packet    = rm_read_packet,
-    .read_close     = rm_read_close,
-    .read_timestamp = rm_read_dts,
-    .read_seek      = rm_read_seek,
-};
-
-AVInputFormat ff_rdt_demuxer = {
-    .name           = "rdt",
-    .long_name      = NULL_IF_CONFIG_SMALL("RDT demuxer"),
-    .priv_data_size = sizeof(RMDemuxContext),
-    .read_close     = rm_read_close,
-    .flags          = AVFMT_NOFILE,
-};