Initial revision

Originally committed as revision 5 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 710 insertions, 0 deletions

diff --git a/libav/rm.c b/libav/rm.c
new file mode 100644
index 0000000000..8c850400e4
--- /dev/null
+++ b/libav/rm.c
@@ -0,0 +1,710 @@
+/*
+ * "Real" compatible mux and demux.
+ * Copyright (c) 2000, 2001 Gerard Lantau.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <errno.h>
+
+#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;
+} RMContext;
+
+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 */
+        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 */
+            put_tag(s,"VIDORV10");
+            put_be16(s, stream->enc->width);
+            put_be16(s, stream->enc->height);
+            put_be16(s, 24); /* frames per seconds ? */
+            put_be32(s,0);     /* unknown meaning */
+            put_be16(s, 12);  /* 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 */
+            put_be32(s,0x10000000); 
+            //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)
+{
+    StreamInfo *stream;
+    RMContext *rm;
+    int n;
+    AVCodecContext *codec;
+
+    rm = malloc(sizeof(RMContext));
+    if (!rm)
+        return -1;
+    memset(rm, 0, sizeof(RMContext));
+    s->priv_data = rm;
+    
+    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->frame_rate / (float)FRAME_RATE_BASE;
+            /* XXX: dummy values */
+            stream->packet_max_size = 4096;
+            stream->nb_packets = 0;
+            stream->total_frames = stream->nb_packets;
+            break;
+        }
+    }
+
+    rv10_write_header(s, 0, 0);
+    put_flush_packet(&s->pb);
+    return 0;
+}
+
+static int rm_write_audio(AVFormatContext *s, UINT8 *buf, int size)
+{
+    UINT8 buf1[size];
+    RMContext *rm = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    StreamInfo *stream = rm->audio_stream;
+    int i;
+
+    write_packet_header(s, stream, size, stream->enc->key_frame);
+    
+    /* 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++;
+    return 0;
+}
+
+static int rm_write_video(AVFormatContext *s, UINT8 *buf, int size)
+{
+    RMContext *rm = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    StreamInfo *stream = rm->video_stream;
+    int key_frame = stream->enc->key_frame;
+    
+    /* 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, int stream_index, 
+                           UINT8 *buf, int size)
+{
+    if (s->streams[stream_index]->codec.codec_type == 
+        CODEC_TYPE_AUDIO)
+        return rm_write_audio(s, buf, size);
+    else
+        return rm_write_video(s, buf, size);
+}
+        
+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);
+
+    free(rm);
+    return 0;
+}
+
+/***************************************************/
+
+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 int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+    RMContext *rm;
+    AVStream *st;
+    ByteIOContext *pb = &s->pb;
+    unsigned int tag, v;
+    int tag_size, size, codec_data_size, i;
+    INT64 codec_pos;
+    unsigned int h263_hack_version;
+    char buf[128];
+
+    if (get_le32(pb) != MKTAG('.', 'R', 'M', 'F'))
+        return -EIO;
+    rm = av_mallocz(sizeof(RMContext));
+    if (!rm)
+        return -ENOMEM;
+    s->priv_data = rm;
+
+    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)
+            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 */
+            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_mallocz(sizeof(AVStream));
+            if (!st)
+                goto fail;
+            s->streams[s->nb_streams++] = st;
+            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 */
+            get_be32(pb); /* start time */
+            get_be32(pb); /* preroll */
+            get_be32(pb); /* 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);
+
+            v = get_be32(pb);
+            if (v == MKTAG(0xfd, 'a', 'r', '.')) {
+                /* ra type header */
+                get_be32(pb); /* version */
+                get_be32(pb); /* .ra4 */
+                get_be32(pb);
+                get_be16(pb);
+                get_be32(pb); /* header size */
+                get_be16(pb); /* add codec info */
+                get_be32(pb); /* coded frame size */
+                get_be32(pb); /* ??? */
+                get_be32(pb); /* ??? */
+                get_be32(pb); /* ??? */
+                get_be16(pb); /* 1 */ 
+                get_be16(pb); /* coded frame size */
+                get_be32(pb);
+                st->codec.sample_rate = get_be16(pb);
+                get_be32(pb);
+                st->codec.channels = get_be16(pb);
+                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 {
+                    st->codec.codec_id = CODEC_ID_NONE;
+                    nstrcpy(st->codec.codec_name, sizeof(st->codec.codec_name),
+                            buf);
+                }
+            } else {
+                if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
+                fail1:
+                    fprintf(stderr, "Unsupported video codec\n");
+                    goto fail;
+                }
+                st->codec.codec_tag = get_le32(pb);
+                if (st->codec.codec_tag != MKTAG('R', 'V', '1', '0'))
+                    goto fail1;
+                st->codec.width = get_be16(pb);
+                st->codec.height = get_be16(pb);
+                st->codec.frame_rate = get_be16(pb) * FRAME_RATE_BASE;
+                st->codec.codec_type = CODEC_TYPE_VIDEO;
+                get_be32(pb);
+                get_be16(pb);
+                get_be32(pb);
+                get_be16(pb);
+                /* modification of h263 codec version (!) */
+                h263_hack_version = get_be32(pb);
+                switch(h263_hack_version) {
+                case 0x10000000:
+                    st->codec.sub_id = 0;
+                    st->codec.codec_id = CODEC_ID_RV10;
+                    break;
+                case 0x10003000:
+                case 0x10003001:
+                    st->codec.sub_id = 3;
+                    st->codec.codec_id = CODEC_ID_RV10;
+                    break;
+                default:
+                    /* not handled */
+                    st->codec.codec_id = CODEC_ID_NONE;
+                    break;
+                }
+            }
+            /* 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 */
+    get_be32(pb); /* next data header */
+    return 0;
+
+ fail:
+    for(i=0;i<s->nb_streams;i++) {
+        free(s->streams[i]);
+    }
+    return -EIO;
+}
+
+static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    RMContext *rm = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    AVStream *st;
+    int len, num, timestamp, i, tmp, j;
+    UINT8 *ptr;
+
+ redo:
+    if (rm->nb_packets == 0)
+        return -EIO;
+    get_be16(pb);
+    len = get_be16(pb);
+    if (len < 12)
+        return -EIO;
+    num = get_be16(pb);
+    timestamp = get_be32(pb);
+    get_byte(pb); /* reserved */
+    get_byte(pb); /* flags */
+    rm->nb_packets--;
+    len -= 12;
+
+    st = NULL;
+    for(i=0;i<s->nb_streams;i++) {
+        st = s->streams[i];
+        if (num == st->id)
+            break;
+    }
+    if (i == s->nb_streams) {
+        /* skip packet if unknown number */
+        url_fskip(pb, len);
+        goto redo;
+    }
+    
+    av_new_packet(pkt, len);
+    pkt->stream_index = i;
+    get_buffer(pb, pkt->data, len);
+    /* 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;
+    free(rm);
+    return 0;
+}
+
+AVFormat rm_format = {
+    "rm",
+    "rm format",
+    "audio/x-pn-realaudio",
+    "rm,ra",
+    CODEC_ID_AC3,
+    CODEC_ID_RV10,
+    rm_write_header,
+    rm_write_packet,
+    rm_write_trailer,
+
+    rm_read_header,
+    rm_read_packet,
+    rm_read_close,
+};