asfdec: fallback to binary search internally
[ffmpeg.git] / libavformat / rmdec.c
index e8ecc92..843706d 100644 (file)
@@ -1,37 +1,38 @@
 /*
  * "Real" compatible demuxer.
- * Copyright (c) 2000, 2001 Fabrice Bellard.
+ * Copyright (c) 2000, 2001 Fabrice Bellard
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavutil/avstring.h"
+#include "libavutil/intreadwrite.h"
 #include "avformat.h"
+#include "riff.h"
 #include "rm.h"
 
 struct RMStream {
-    uint8_t *videobuf; ///< place to store merged video frame
+    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
-    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
@@ -48,28 +49,63 @@ typedef struct {
     int audio_pkt_cnt; ///< Output packet counter
 } RMDemuxContext;
 
-static inline void get_strl(ByteIOContext *pb, char *buf, int buf_size, int len)
+static const unsigned char sipr_swaps[38][2] = {
+    {  0, 63 }, {  1, 22 }, {  2, 44 }, {  3, 90 },
+    {  5, 81 }, {  7, 31 }, {  8, 86 }, {  9, 58 },
+    { 10, 36 }, { 12, 68 }, { 13, 39 }, { 14, 73 },
+    { 15, 53 }, { 16, 69 }, { 17, 57 }, { 19, 88 },
+    { 20, 34 }, { 21, 71 }, { 24, 46 }, { 25, 94 },
+    { 26, 54 }, { 28, 75 }, { 29, 50 }, { 32, 70 },
+    { 33, 92 }, { 35, 74 }, { 38, 85 }, { 40, 56 },
+    { 42, 87 }, { 43, 65 }, { 45, 59 }, { 48, 79 },
+    { 49, 93 }, { 51, 89 }, { 55, 95 }, { 61, 76 },
+    { 67, 83 }, { 77, 80 }
+};
+
+const unsigned char ff_sipr_subpk_size[4] = { 29, 19, 37, 20 };
+
+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 = get_byte(pb);
+        r = avio_r8(pb);
         if (i < buf_size - 1)
             *q++ = r;
     }
     if (buf_size > 0) *q = '\0';
 }
 
-static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
+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)
 {
-    get_strl(pb, buf, buf_size, get_be16(pb));
+    if (size >= 1<<24)
+        return -1;
+    avctx->extradata = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+    avctx->extradata_size = avio_read(pb, avctx->extradata, size);
+    memset(avctx->extradata + avctx->extradata_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+    if (avctx->extradata_size != size)
+        return AVERROR(EIO);
+    return 0;
 }
 
-static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
+static void rm_read_metadata(AVFormatContext *s, int wide)
 {
-    get_strl(pb, buf, buf_size, get_byte(pb));
+    char buf[1024];
+    int i;
+    for (i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
+        int len = wide ? avio_rb16(s->pb) : avio_r8(s->pb);
+        get_strl(s->pb, buf, sizeof(buf), len);
+        av_metadata_set2(&s->metadata, ff_rm_metadata[i], buf, 0);
+    }
 }
 
 RMStream *ff_rm_alloc_rmstream (void)
@@ -81,74 +117,76 @@ RMStream *ff_rm_alloc_rmstream (void)
 
 void ff_rm_free_rmstream (RMStream *rms)
 {
-    av_free(rms->videobuf);
-    av_free(rms->audiobuf);
-    av_free(rms);
+    av_free_packet(&rms->pkt);
 }
 
-static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
+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 = get_be32(pb); /* version */
-    if (((version >> 16) & 0xff) == 3) {
-        int64_t startpos = url_ftell(pb);
-        url_fskip(pb, 14);
-        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) {
+    version = avio_rb16(pb); /* version */
+    if (version == 3) {
+        int header_size = avio_rb16(pb);
+        int64_t startpos = avio_tell(pb);
+        avio_skip(pb, 14);
+        rm_read_metadata(s, 0);
+        if ((startpos + header_size) >= avio_tell(pb) + 2) {
             // fourcc (should always be "lpcJ")
-            get_byte(pb);
+            avio_r8(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));
+        if ((startpos + header_size) > avio_tell(pb))
+            avio_skip(pb, header_size + startpos - avio_tell(pb));
         st->codec->sample_rate = 8000;
         st->codec->channels = 1;
-        st->codec->codec_type = CODEC_TYPE_AUDIO;
+        st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
         st->codec->codec_id = CODEC_ID_RA_144;
     } else {
         int flavor, sub_packet_h, coded_framesize, sub_packet_size;
+        int codecdata_length;
         /* 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 */
-        ast->coded_framesize = coded_framesize = get_be32(pb); /* coded frame size */
-        get_be32(pb); /* ??? */
-        get_be32(pb); /* ??? */
-        get_be32(pb); /* ??? */
-        ast->sub_packet_h = sub_packet_h = get_be16(pb); /* 1 */
-        st->codec->block_align= get_be16(pb); /* frame size */
-        ast->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);
+        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); /* ??? */
+        avio_rb32(pb); /* ??? */
+        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 = get_be16(pb);
-        get_be32(pb);
-        st->codec->channels = get_be16(pb);
-        if (((version >> 16) & 0xff) == 5) {
-            get_be32(pb);
-            get_buffer(pb, buf, 4);
+        st->codec->sample_rate = avio_rb16(pb);
+        avio_rb32(pb);
+        st->codec->channels = avio_rb16(pb);
+        if (version == 5) {
+            avio_rb32(pb);
+            avio_read(pb, buf, 4);
             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;
+        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 CODEC_ID_AC3:
             st->need_parsing = AVSTREAM_PARSE_FULL;
-        } else if (!strcmp(buf, "28_8")) {
-            st->codec->codec_id = CODEC_ID_RA_288;
+            break;
+        case CODEC_ID_RA_288:
             st->codec->extradata_size= 0;
             ast->audio_framesize = st->codec->block_align;
             st->codec->block_align = coded_framesize;
@@ -158,143 +196,179 @@ static int rm_read_audio_stream_info(AVFormatContext *s, ByteIOContext *pb,
                 return -1;
             }
 
-            ast->audiobuf = av_malloc(ast->audio_framesize * sub_packet_h);
-        } else if ((!strcmp(buf, "cook")) || (!strcmp(buf, "atrc")) || (!strcmp(buf, "sipr"))) {
-            int codecdata_length;
-            get_be16(pb); get_byte(pb);
-            if (((version >> 16) & 0xff) == 5)
-                get_byte(pb);
-            codecdata_length = get_be32(pb);
+            av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
+            break;
+        case CODEC_ID_COOK:
+        case CODEC_ID_ATRAC3:
+        case CODEC_ID_SIPR:
+            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(sub_packet_size <= 0){
-                av_log(s, AV_LOG_ERROR, "sub_packet_size is invalid\n");
-                return -1;
-            }
-
-            if (!strcmp(buf, "cook")) st->codec->codec_id = CODEC_ID_COOK;
-            else if (!strcmp(buf, "sipr")) st->codec->codec_id = CODEC_ID_SIPR;
-            else st->codec->codec_id = CODEC_ID_ATRAC3;
-            st->codec->extradata_size= codecdata_length;
-            st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
-            get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
             ast->audio_framesize = st->codec->block_align;
-            st->codec->block_align = ast->sub_packet_size;
+            if (st->codec->codec_id == 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;
 
             if(ast->audio_framesize >= UINT_MAX / sub_packet_h){
                 av_log(s, AV_LOG_ERROR, "rm->audio_framesize * sub_packet_h too large\n");
                 return -1;
             }
 
-            ast->audiobuf = av_malloc(ast->audio_framesize * sub_packet_h);
-        } else if (!strcmp(buf, "raac") || !strcmp(buf, "racp")) {
-            int codecdata_length;
-            get_be16(pb); get_byte(pb);
-            if (((version >> 16) & 0xff) == 5)
-                get_byte(pb);
-            st->codec->codec_id = CODEC_ID_AAC;
-            codecdata_length = get_be32(pb);
+            av_new_packet(&ast->pkt, ast->audio_framesize * sub_packet_h);
+            break;
+        case 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) {
-                st->codec->extradata_size = codecdata_length - 1;
-                st->codec->extradata = av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
-                get_byte(pb);
-                get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
+                avio_r8(pb);
+                if ((ret = rm_read_extradata(pb, st->codec, codecdata_length - 1)) < 0)
+                    return ret;
             }
-        } else {
-            st->codec->codec_id = CODEC_ID_NONE;
+            break;
+        default:
             av_strlcpy(st->codec->codec_name, buf, sizeof(st->codec->codec_name));
         }
         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));
+            avio_r8(pb);
+            avio_r8(pb);
+            avio_r8(pb);
+            rm_read_metadata(s, 0);
         }
     }
     return 0;
 }
 
 int
-ff_rm_read_mdpr_codecdata (AVFormatContext *s, ByteIOContext *pb,
+ff_rm_read_mdpr_codecdata (AVFormatContext *s, AVIOContext *pb,
                            AVStream *st, RMStream *rst, int codec_data_size)
 {
     unsigned int v;
     int size;
     int64_t codec_pos;
+    int ret;
 
     av_set_pts_info(st, 64, 1, 1000);
-    codec_pos = url_ftell(pb);
-    v = get_be32(pb);
+    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 {
         int fps, fps2;
-        if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
+        if (avio_rl32(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')
-            && st->codec->codec_tag != MKTAG('R', 'V', 'T', 'R'))
+        st->codec->codec_tag = avio_rl32(pb);
+        st->codec->codec_id  = ff_codec_get_id(ff_rm_codec_tags,
+                                               st->codec->codec_tag);
+//        av_log(s, AV_LOG_DEBUG, "%X %X\n", st->codec->codec_tag, MKTAG('R', 'V', '2', '0'));
+        if (st->codec->codec_id == CODEC_ID_NONE)
             goto fail1;
-        st->codec->width = get_be16(pb);
-        st->codec->height = get_be16(pb);
+        st->codec->width = avio_rb16(pb);
+        st->codec->height = avio_rb16(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);
+        fps= avio_rb16(pb);
+        st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
+        avio_rb32(pb);
+        fps2= avio_rb16(pb);
+        avio_rb16(pb);
 
-        st->codec->extradata_size= codec_data_size - (url_ftell(pb) - codec_pos);
-
-        if(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE <= (unsigned)st->codec->extradata_size){
-            //check is redundant as get_buffer() will catch this
-            av_log(s, AV_LOG_ERROR, "st->codec->extradata_size too large\n");
-            return -1;
-        }
-        st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
-        if (!st->codec->extradata)
-            return AVERROR(ENOMEM);
-        get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
+        if ((ret = rm_read_extradata(pb, st->codec, codec_data_size - (avio_tell(pb) - codec_pos))) < 0)
+            return ret;
 
-//        av_log(NULL, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
+//        av_log(s, AV_LOG_DEBUG, "fps= %d fps2= %d\n", fps, fps2);
         st->codec->time_base.den = fps * st->codec->time_base.num;
-        switch(((uint8_t*)st->codec->extradata)[4]>>4){
+        //XXX: do we really need that?
+        switch(st->codec->extradata[4]>>4){
         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;
+        default:
+            av_log(st->codec, AV_LOG_ERROR, "extra:%02X %02X %02X %02X %02X\n", st->codec->extradata[0], st->codec->extradata[1], st->codec->extradata[2], st->codec->extradata[3], st->codec->extradata[4]);
+            goto fail1;
         }
     }
 
 skip:
     /* skip codec info */
-    size = url_ftell(pb) - codec_pos;
-    url_fskip(pb, codec_data_size - size);
+    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)
+            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)
+            return -1;
+    } while (next_off);
+
+    return 0;
+}
 
 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
 {
@@ -313,14 +387,15 @@ static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
 {
     RMDemuxContext *rm = s->priv_data;
     AVStream *st;
-    ByteIOContext *pb = s->pb;
+    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];
     int flags = 0;
 
-    tag = get_le32(pb);
+    tag = avio_rl32(pb);
     if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
         /* very old .ra format */
         return rm_read_header_old(s, ap);
@@ -328,98 +403,102 @@ static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
         return AVERROR(EIO);
     }
 
-    get_be32(pb); /* header size */
-    get_be16(pb);
-    get_be32(pb);
-    get_be32(pb); /* number of headers */
+    avio_rb32(pb); /* header size */
+    avio_rb16(pb);
+    avio_rb32(pb);
+    avio_rb32(pb); /* number of headers */
 
     for(;;) {
-        if (url_feof(pb))
+        if (pb->eof_reached)
             return -1;
-        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
+        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 */
-            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 */
+            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 */
+            avio_rb32(pb); /* duration */
+            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'):
-            get_str16(pb, s->title, sizeof(s->title));
-            get_str16(pb, s->author, sizeof(s->author));
-            get_str16(pb, s->copyright, sizeof(s->copyright));
-            get_str16(pb, s->comment, sizeof(s->comment));
+            rm_read_metadata(s, 1);
             break;
         case MKTAG('M', 'D', 'P', 'R'):
             st = av_new_stream(s, 0);
             if (!st)
                 return AVERROR(ENOMEM);
-            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->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;
             get_str8(pb, buf, sizeof(buf)); /* desc */
             get_str8(pb, buf, sizeof(buf)); /* mimetype */
-            st->codec->codec_type = CODEC_TYPE_DATA;
+            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,
-                                          get_be32(pb)) < 0)
+                                          avio_rb32(pb)) < 0)
                 return -1;
             break;
         case MKTAG('D', 'A', 'T', 'A'):
             goto header_end;
         default:
             /* unknown tag: skip it */
-            url_fskip(pb, tag_size - 10);
+            avio_skip(pb, tag_size - 10);
             break;
         }
     }
  header_end:
-    rm->nb_packets = get_be32(pb); /* number of packets */
+    rm->nb_packets = avio_rb32(pb); /* number of packets */
     if (!rm->nb_packets && (flags & 4))
         rm->nb_packets = 3600 * 25;
-    get_be32(pb); /* next data header */
+    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(ByteIOContext *pb, int *len)
+static int get_num(AVIOContext *pb, int *len)
 {
     int n, n1;
 
-    n = get_be16(pb);
+    n = avio_rb16(pb);
     (*len)-=2;
     n &= 0x7FFF;
     if (n >= 0x4000) {
         return n - 0x4000;
     } else {
-        n1 = get_be16(pb);
+        n1 = avio_rb16(pb);
         (*len)-=2;
         return (n << 16) | n1;
     }
@@ -430,40 +509,52 @@ static int get_num(ByteIOContext *pb, int *len)
 
 static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_index, int64_t *pos){
     RMDemuxContext *rm = s->priv_data;
-    ByteIOContext *pb = s->pb;
-    int len, num, res, i;
+    AVIOContext *pb = s->pb;
     AVStream *st;
     uint32_t state=0xFFFFFFFF;
 
-    while(!url_feof(pb)){
-        *pos= url_ftell(pb) - 3;
+    while(!pb->eof_reached){
+        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) + get_byte(pb);
+            state= (state<<8) + avio_r8(pb);
 
             if(state == MKBETAG('I', 'N', 'D', 'X')){
-                len = get_be16(pb) - 6;
+                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)
+            if(state > (unsigned)0xFFFF || state <= 12)
                 continue;
-            len=state;
+            len=state - 12;
             state= 0xFFFFFFFF;
 
-            num = get_be16(pb);
-            *timestamp = get_be32(pb);
-            res= get_byte(pb); /* reserved */
-            *flags = get_byte(pb); /* flags */
-
-
-            len -= 12;
+            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];
@@ -473,8 +564,8 @@ static int sync(AVFormatContext *s, int64_t *timestamp, int *flags, int *stream_
         if (i == s->nb_streams) {
 skip:
             /* skip packet if unknown number */
-            url_fskip(pb, len);
-            rm->remaining_len -= len;
+            avio_skip(pb, len);
+            rm->remaining_len = 0;
             continue;
         }
         *stream_index= i;
@@ -484,84 +575,82 @@ skip:
     return -1;
 }
 
-static int rm_assemble_video_frame(AVFormatContext *s, ByteIOContext *pb,
+static int rm_assemble_video_frame(AVFormatContext *s, AVIOContext *pb,
                                    RMDemuxContext *rm, RMStream *vst,
-                                   AVPacket *pkt, int len)
+                                   AVPacket *pkt, int len, int *pseq)
 {
     int hdr, seq, pic_num, len2, pos;
     int type;
 
-    hdr = get_byte(pb); len--;
+    hdr = avio_r8(pb); len--;
     type = hdr >> 6;
-    switch(type){
-    case 0: // slice
-    case 2: // last slice
-        seq = get_byte(pb); len--;
+
+    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 = get_byte(pb); len--;
-        rm->remaining_len = len;
-        break;
-    case 1: //whole frame
-        seq = get_byte(pb); len--;
+        pos  = get_num(pb, &len);
+        pic_num = avio_r8(pb); len--;
+    }
+    if(len<0)
+        return -1;
+    rm->remaining_len = len;
+    if(type&1){     // frame, not slice
+        if(type == 3)  // frame as a part of packet
+            len= len2;
+        if(rm->remaining_len < len)
+            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);
-        get_buffer(pb, pkt->data + 9, len);
-        rm->remaining_len = 0;
-        return 0;
-    case 3: //frame as a part of packet
-        len2 = get_num(pb, &len);
-        pos = get_num(pb, &len);
-        pic_num = get_byte(pb); len--;
-        rm->remaining_len = len - len2;
-        if(av_new_packet(pkt, len2 + 9) < 0)
-            return AVERROR(EIO);
-        pkt->data[0] = 0;
-        AV_WL32(pkt->data + 1, 1);
-        AV_WL32(pkt->data + 5, 0);
-        get_buffer(pb, pkt->data + 9, len2);
+        avio_read(pb, pkt->data + 9, len);
         return 0;
     }
     //now we have to deal with single slice
 
+    *pseq = seq;
     if((seq & 0x7F) == 1 || vst->curpic_num != pic_num){
         vst->slices = ((hdr & 0x3F) << 1) + 1;
         vst->videobufsize = len2 + 8*vst->slices + 1;
-        av_free(vst->videobuf);
-        if(!(vst->videobuf = av_malloc(vst->videobufsize)))
+        av_free_packet(&vst->pkt); //FIXME this should be output.
+        if(av_new_packet(&vst->pkt, vst->videobufsize) < 0)
             return AVERROR(ENOMEM);
         vst->videobufpos = 8*vst->slices + 1;
         vst->cur_slice = 0;
         vst->curpic_num = pic_num;
-        vst->pktpos = url_ftell(pb);
+        vst->pktpos = avio_tell(pb);
     }
     if(type == 2)
         len = FFMIN(len, pos);
 
     if(++vst->cur_slice > vst->slices)
         return 1;
-    AV_WL32(vst->videobuf - 7 + 8*vst->cur_slice, 1);
-    AV_WL32(vst->videobuf - 3 + 8*vst->cur_slice, vst->videobufpos - 8*vst->slices - 1);
+    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)
         return 1;
-    if (get_buffer(pb, vst->videobuf + vst->videobufpos, len) != len)
+    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->videobuf[0] = vst->cur_slice-1;
-         if(av_new_packet(pkt, vst->videobufpos - 8*(vst->slices - vst->cur_slice)) < 0)
-             return AVERROR(ENOMEM);
-         memcpy(pkt->data, vst->videobuf, 1 + 8*vst->cur_slice);
-         memcpy(pkt->data + 1 + 8*vst->cur_slice, vst->videobuf + 1 + 8*vst->slices,
+        vst->pkt.data[0] = vst->cur_slice-1;
+        *pkt= vst->pkt;
+        vst->pkt.data= NULL;
+        vst->pkt.size= 0;
+        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->pts = AV_NOPTS_VALUE;
-         pkt->pos = vst->pktpos;
-         return 0;
+        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;
@@ -582,18 +671,44 @@ rm_ac3_swap_bytes (AVStream *st, AVPacket *pkt)
     }
 }
 
+/**
+ * Perform 4-bit block reordering for SIPR data.
+ * @todo This can be optimized, e.g. use memcpy() if data blocks are aligned
+ */
+void ff_rm_reorder_sipr_data(uint8_t *buf, int sub_packet_h, int framesize)
+{
+    int n, bs = sub_packet_h * framesize * 2 / 96; // nibbles per subpacket
+
+    for (n = 0; n < 38; n++) {
+        int j;
+        int i = bs * sipr_swaps[n][0];
+        int o = bs * sipr_swaps[n][1];
+
+        /* swap 4bit-nibbles of block 'i' with 'o' */
+        for (j = 0; j < bs; j++, i++, o++) {
+            int x = (buf[i >> 1] >> (4 * (i & 1))) & 0xF,
+                y = (buf[o >> 1] >> (4 * (o & 1))) & 0xF;
+
+            buf[o >> 1] = (x << (4 * (o & 1))) |
+                (buf[o >> 1] & (0xF << (4 * !(o & 1))));
+            buf[i >> 1] = (y << (4 * (i & 1))) |
+                (buf[i >> 1] & (0xF << (4 * !(i & 1))));
+        }
+    }
+}
+
 int
-ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
+ff_rm_parse_packet (AVFormatContext *s, AVIOContext *pb,
                     AVStream *st, RMStream *ast, int len, AVPacket *pkt,
-                    int *seq, int *flags, int64_t *timestamp)
+                    int *seq, int flags, int64_t timestamp)
 {
     RMDemuxContext *rm = s->priv_data;
 
-    if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+    if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
         rm->current_stream= st->id;
-        if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len) == 1)
+        if(rm_assemble_video_frame(s, pb, rm, ast, pkt, len, seq))
             return -1; //got partial frame
-    } else if (st->codec->codec_type == CODEC_TYPE_AUDIO) {
+    } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
         if ((st->codec->codec_id == CODEC_ID_RA_288) ||
             (st->codec->codec_id == CODEC_ID_COOK) ||
             (st->codec->codec_id == CODEC_ID_ATRAC3) ||
@@ -605,47 +720,45 @@ ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
             int y = ast->sub_packet_cnt;
             int w = ast->audio_framesize;
 
-            if (*flags & 2)
+            if (flags & 2)
                 y = ast->sub_packet_cnt = 0;
             if (!y)
-                ast->audiotimestamp = *timestamp;
+                ast->audiotimestamp = timestamp;
 
             switch(st->codec->codec_id) {
                 case CODEC_ID_RA_288:
                     for (x = 0; x < h/2; x++)
-                        get_buffer(pb, ast->audiobuf+x*2*w+y*cfs, cfs);
+                        avio_read(pb, ast->pkt.data+x*2*w+y*cfs, cfs);
                     break;
                 case CODEC_ID_ATRAC3:
                 case CODEC_ID_COOK:
                     for (x = 0; x < w/sps; x++)
-                        get_buffer(pb, ast->audiobuf+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
+                        avio_read(pb, ast->pkt.data+sps*(h*x+((h+1)/2)*(y&1)+(y>>1)), sps);
+                    break;
+                case CODEC_ID_SIPR:
+                    avio_read(pb, ast->pkt.data + y * w, w);
                     break;
             }
 
             if (++(ast->sub_packet_cnt) < h)
                 return -1;
-            else {
-                ast->sub_packet_cnt = 0;
-                rm->audio_stream_num = st->index;
-                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, ast->audiobuf, st->codec->block_align);
-                *timestamp = ast->audiotimestamp;
-                *flags = 2; // Mark first packet as keyframe
-            }
+            if (st->codec->codec_id == CODEC_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 (st->codec->codec_id == CODEC_ID_AAC) {
             int x;
             rm->audio_stream_num = st->index;
-            ast->sub_packet_cnt = (get_be16(pb) & 0xf0) >> 4;
+            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] = get_be16(pb);
-                // Release first audio packet
-                rm->audio_pkt_cnt = ast->sub_packet_cnt - 1;
-                av_get_packet(pb, pkt, ast->sub_packet_lengths[0]);
-                *flags = 2; // Mark first packet as keyframe
-            }
+                    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);
@@ -653,36 +766,30 @@ ff_rm_parse_packet (AVFormatContext *s, ByteIOContext *pb,
     } else
         av_get_packet(pb, pkt, len);
 
-    if(  (st->discard >= AVDISCARD_NONKEY && !(*flags&2))
-       || st->discard >= AVDISCARD_ALL){
-        av_free_packet(pkt);
-        return -1;
-    }
-
     pkt->stream_index = st->index;
 
 #if 0
-    if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+    if (st->codec->codec_type == AVMEDIA_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 %"PRId64" %d\n", *timestamp, *timestamp*512LL/25, seq);
+            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;
+            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;
+    pkt->pts= timestamp;
+    if (flags & 2)
+        pkt->flags |= AV_PKT_FLAG_KEY;
 
-    return st->codec->codec_type == CODEC_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
+    return st->codec->codec_type == AVMEDIA_TYPE_AUDIO ? rm->audio_pkt_cnt : 0;
 }
 
 int
-ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
+ff_rm_retrieve_cache (AVFormatContext *s, AVIOContext *pb,
                       AVStream *st, RMStream *ast, AVPacket *pkt)
 {
     RMDemuxContext *rm = s->priv_data;
@@ -693,12 +800,16 @@ ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
         av_get_packet(pb, pkt, ast->sub_packet_lengths[ast->sub_packet_cnt - rm->audio_pkt_cnt]);
     else {
         av_new_packet(pkt, st->codec->block_align);
-        memcpy(pkt->data, ast->audiobuf + st->codec->block_align *
+        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--;
-    pkt->flags = 0;
+    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;
@@ -707,60 +818,50 @@ ff_rm_retrieve_cache (AVFormatContext *s, ByteIOContext *pb,
 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     RMDemuxContext *rm = s->priv_data;
-    ByteIOContext *pb = s->pb;
     AVStream *st;
-    int i, len;
+    int i, len, res, seq = 1;
     int64_t timestamp, pos;
     int flags;
 
-    if (rm->audio_pkt_cnt) {
-        // If there are queued audio packet return them first
-        st = s->streams[rm->audio_stream_num];
-        ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
-    } else if (rm->old_format) {
-        RMStream *ast;
-
-        st = s->streams[0];
-        ast = st->priv_data;
-        if (st->codec->codec_id == CODEC_ID_RA_288) {
-            int x, y;
-
-            for (y = 0; y < ast->sub_packet_h; y++)
-                for (x = 0; x < ast->sub_packet_h/2; x++)
-                    if (get_buffer(pb, ast->audiobuf+x*2*ast->audio_framesize+y*ast->coded_framesize, ast->coded_framesize) <= 0)
-                        return AVERROR(EIO);
-            rm->audio_stream_num = 0;
-            rm->audio_pkt_cnt = ast->sub_packet_h * ast->audio_framesize / st->codec->block_align - 1;
-            // Release first audio packet
-            av_new_packet(pkt, st->codec->block_align);
-            memcpy(pkt->data, ast->audiobuf, st->codec->block_align);
-            pkt->flags |= PKT_FLAG_KEY; // Mark first packet as keyframe
-            pkt->stream_index = 0;
+    for (;;) {
+        if (rm->audio_pkt_cnt) {
+            // If there are queued audio packet return them first
+            st = s->streams[rm->audio_stream_num];
+            ff_rm_retrieve_cache(s, s->pb, st, st->priv_data, pkt);
+            flags = 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(EIO);
+            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];
             }
-            pkt->size = len;
-        }
-        rm_ac3_swap_bytes(st, pkt);
-    } else {
-        int seq=1;
-resync:
-        len=sync(s, &timestamp, &flags, &i, &pos);
-        if(len<0)
-            return AVERROR(EIO);
-        st = s->streams[i];
 
-        if (ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
-                                &seq, &flags, &timestamp) < 0)
-            goto resync;
+            if(len<0 || s->pb->eof_reached)
+                return AVERROR(EIO);
+
+            res = ff_rm_parse_packet (s, s->pb, st, st->priv_data, len, pkt,
+                                      &seq, flags, timestamp);
+            if((flags&2) && (seq&0x7F) == 1)
+                av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
+            if (res)
+                continue;
+        }
 
-        if((flags&2) && (seq&0x7F) == 1)
-            av_add_index_entry(st, pos, timestamp, 0, 0, AVINDEX_KEYFRAME);
+        if(  (st->discard >= AVDISCARD_NONKEY && !(flags&2))
+           || st->discard >= AVDISCARD_ALL){
+            av_free_packet(pkt);
+        } else
+            break;
     }
 
     return 0;
@@ -801,7 +902,7 @@ static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
     if(rm->old_format)
         return AV_NOPTS_VALUE;
 
-    url_fseek(s->pb, pos, SEEK_SET);
+    avio_seek(s->pb, pos, SEEK_SET);
     rm->remaining_len=0;
     for(;;){
         int seq=1;
@@ -812,10 +913,10 @@ static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
             return AV_NOPTS_VALUE;
 
         st = s->streams[stream_index2];
-        if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
-            h= get_byte(s->pb); len--;
+        if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
+            h= avio_r8(s->pb); len--;
             if(!(h & 0x40)){
-                seq = get_byte(s->pb); len--;
+                seq = avio_r8(s->pb); len--;
             }
         }
 
@@ -826,15 +927,15 @@ static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
                 break;
         }
 
-        url_fskip(s->pb, len);
+        avio_skip(s->pb, len);
     }
     *ppos = pos;
     return dts;
 }
 
-AVInputFormat rm_demuxer = {
+AVInputFormat ff_rm_demuxer = {
     "rm",
-    NULL_IF_CONFIG_SMALL("RM format"),
+    NULL_IF_CONFIG_SMALL("RealMedia format"),
     sizeof(RMDemuxContext),
     rm_probe,
     rm_read_header,
@@ -844,9 +945,12 @@ AVInputFormat rm_demuxer = {
     rm_read_dts,
 };
 
-AVInputFormat rdt_demuxer = {
+AVInputFormat ff_rdt_demuxer = {
     "rdt",
     NULL_IF_CONFIG_SMALL("RDT demuxer"),
     sizeof(RMDemuxContext),
-    NULL, NULL, NULL, rm_read_close, NULL, NULL
+    NULL,
+    NULL,
+    NULL,
+    rm_read_close,
 };