split rm muxer and demuxer in their own files

Originally committed as revision 9156 to svn://svn.ffmpeg.org/ffmpeg/trunk

4 files changed, 503 insertions, 456 deletions

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 009d1635bc..a2de37d425 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -113,8 +113,8 @@ OBJS-$(CONFIG_PSP_MUXER)                 += movenc.o riff.o isom.o
 OBJS-$(CONFIG_RAWVIDEO_DEMUXER)          += raw.o
 OBJS-$(CONFIG_RAWVIDEO_MUXER)            += raw.o
 OBJS-$(CONFIG_REDIR_DEMUXER)             += rtsp.o
-OBJS-$(CONFIG_RM_DEMUXER)                += rm.o
-OBJS-$(CONFIG_RM_MUXER)                  += rm.o
+OBJS-$(CONFIG_RM_DEMUXER)                += rmdec.o
+OBJS-$(CONFIG_RM_MUXER)                  += rmenc.o
 OBJS-$(CONFIG_ROQ_DEMUXER)               += idroq.o
 OBJS-$(CONFIG_ROQ_MUXER)                 += raw.o
 OBJS-$(CONFIG_RTP_MUXER)                 += rtp.o rtp_h264.o
diff --git a/libavformat/rm.h b/libavformat/rm.h
new file mode 100644
index 0000000000..2e307c2125
--- /dev/null
+++ b/libavformat/rm.h
@@ -0,0 +1,60 @@
+/*
+ * "Real" compatible muxer and 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
+ */
+
+#ifndef RM_H
+#define RM_H
+
+#include "avformat.h"
+
+
+typedef struct {
+    int nb_packets;
+    int packet_total_size;
+    int packet_max_size;
+    /* codec related output */
+    int bit_rate;
+    float frame_rate;
+    int nb_frames;    /* current frame number */
+    int total_frames; /* total number of frames */
+    int num;
+    AVCodecContext *enc;
+} StreamInfo;
+
+typedef struct {
+    StreamInfo streams[2];
+    StreamInfo *audio_stream, *video_stream;
+    int data_pos; /* position of the data after the header */
+    int nb_packets;
+    int old_format;
+    int current_stream;
+    int remaining_len;
+    /// Audio descrambling matrix parameters
+    uint8_t *audiobuf; ///< place to store reordered audio data
+    int64_t audiotimestamp; ///< Audio packet timestamp
+    int sub_packet_cnt; // Subpacket counter, used while reading
+    int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
+    int audio_stream_num; ///< Stream number for audio packets
+    int audio_pkt_cnt; ///< Output packet counter
+    int audio_framesize; /// Audio frame size from container
+    int sub_packet_lengths[16]; /// Length of each aac subpacket
+} RMContext;
+
+#endif /* RM_H */
diff --git a/libavformat/rm.c b/libavformat/rmdec.c
index 96752f225f..39219b17e0 100644
--- a/libavformat/rm.c
+++ b/libavformat/rmdec.c
@@ -1,5 +1,5 @@
 /*
- * "Real" compatible muxer and demuxer.
+ * "Real" compatible demuxer.
  * Copyright (c) 2000, 2001 Fabrice Bellard.
  *
  * This file is part of FFmpeg.
@@ -19,444 +19,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 #include "avformat.h"
+#include "rm.h"
 
-/* in ms */
-#define BUFFER_DURATION 0
-
-typedef struct {
-    int nb_packets;
-    int packet_total_size;
-    int packet_max_size;
-    /* codec related output */
-    int bit_rate;
-    float frame_rate;
-    int nb_frames;    /* current frame number */
-    int total_frames; /* total number of frames */
-    int num;
-    AVCodecContext *enc;
-} StreamInfo;
-
-typedef struct {
-    StreamInfo streams[2];
-    StreamInfo *audio_stream, *video_stream;
-    int data_pos; /* position of the data after the header */
-    int nb_packets;
-    int old_format;
-    int current_stream;
-    int remaining_len;
-    /// Audio descrambling matrix parameters
-    uint8_t *audiobuf; ///< place to store reordered audio data
-    int64_t audiotimestamp; ///< Audio packet timestamp
-    int sub_packet_cnt; // Subpacket counter, used while reading
-    int sub_packet_size, sub_packet_h, coded_framesize; ///< Descrambling parameters from container
-    int audio_stream_num; ///< Stream number for audio packets
-    int audio_pkt_cnt; ///< Output packet counter
-    int audio_framesize; /// Audio frame size from container
-    int sub_packet_lengths[16]; /// Length of each aac subpacket
-} RMContext;
-
-#ifdef CONFIG_MUXERS
-static void put_str(ByteIOContext *s, const char *tag)
-{
-    put_be16(s,strlen(tag));
-    while (*tag) {
-        put_byte(s, *tag++);
-    }
-}
-
-static void put_str8(ByteIOContext *s, const char *tag)
-{
-    put_byte(s, strlen(tag));
-    while (*tag) {
-        put_byte(s, *tag++);
-    }
-}
-
-static void rv10_write_header(AVFormatContext *ctx,
-                              int data_size, int index_pos)
-{
-    RMContext *rm = ctx->priv_data;
-    ByteIOContext *s = &ctx->pb;
-    StreamInfo *stream;
-    unsigned char *data_offset_ptr, *start_ptr;
-    const char *desc, *mimetype;
-    int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
-    int bit_rate, v, duration, flags, data_pos;
-
-    start_ptr = s->buf_ptr;
-
-    put_tag(s, ".RMF");
-    put_be32(s,18); /* header size */
-    put_be16(s,0);
-    put_be32(s,0);
-    put_be32(s,4 + ctx->nb_streams); /* num headers */
-
-    put_tag(s,"PROP");
-    put_be32(s, 50);
-    put_be16(s, 0);
-    packet_max_size = 0;
-    packet_total_size = 0;
-    nb_packets = 0;
-    bit_rate = 0;
-    duration = 0;
-    for(i=0;i<ctx->nb_streams;i++) {
-        StreamInfo *stream = &rm->streams[i];
-        bit_rate += stream->bit_rate;
-        if (stream->packet_max_size > packet_max_size)
-            packet_max_size = stream->packet_max_size;
-        nb_packets += stream->nb_packets;
-        packet_total_size += stream->packet_total_size;
-        /* select maximum duration */
-        v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
-        if (v > duration)
-            duration = v;
-    }
-    put_be32(s, bit_rate); /* max bit rate */
-    put_be32(s, bit_rate); /* avg bit rate */
-    put_be32(s, packet_max_size);        /* max packet size */
-    if (nb_packets > 0)
-        packet_avg_size = packet_total_size / nb_packets;
-    else
-        packet_avg_size = 0;
-    put_be32(s, packet_avg_size);        /* avg packet size */
-    put_be32(s, nb_packets);  /* num packets */
-    put_be32(s, duration); /* duration */
-    put_be32(s, BUFFER_DURATION);           /* preroll */
-    put_be32(s, index_pos);           /* index offset */
-    /* computation of data the data offset */
-    data_offset_ptr = s->buf_ptr;
-    put_be32(s, 0);           /* data offset : will be patched after */
-    put_be16(s, ctx->nb_streams);    /* num streams */
-    flags = 1 | 2; /* save allowed & perfect play */
-    if (url_is_streamed(s))
-        flags |= 4; /* live broadcast */
-    put_be16(s, flags);
-
-    /* comments */
-
-    put_tag(s,"CONT");
-    size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) +
-        strlen(ctx->comment) + 4 * 2 + 10;
-    put_be32(s,size);
-    put_be16(s,0);
-    put_str(s, ctx->title);
-    put_str(s, ctx->author);
-    put_str(s, ctx->copyright);
-    put_str(s, ctx->comment);
-
-    for(i=0;i<ctx->nb_streams;i++) {
-        int codec_data_size;
-
-        stream = &rm->streams[i];
-
-        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
-            desc = "The Audio Stream";
-            mimetype = "audio/x-pn-realaudio";
-            codec_data_size = 73;
-        } else {
-            desc = "The Video Stream";
-            mimetype = "video/x-pn-realvideo";
-            codec_data_size = 34;
-        }
-
-        put_tag(s,"MDPR");
-        size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
-        put_be32(s, size);
-        put_be16(s, 0);
-
-        put_be16(s, i); /* stream number */
-        put_be32(s, stream->bit_rate); /* max bit rate */
-        put_be32(s, stream->bit_rate); /* avg bit rate */
-        put_be32(s, stream->packet_max_size);        /* max packet size */
-        if (stream->nb_packets > 0)
-            packet_avg_size = stream->packet_total_size /
-                stream->nb_packets;
-        else
-            packet_avg_size = 0;
-        put_be32(s, packet_avg_size);        /* avg packet size */
-        put_be32(s, 0);           /* start time */
-        put_be32(s, BUFFER_DURATION);           /* preroll */
-        /* duration */
-        if (url_is_streamed(s) || !stream->total_frames)
-            put_be32(s, (int)(3600 * 1000));
-        else
-            put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
-        put_str8(s, desc);
-        put_str8(s, mimetype);
-        put_be32(s, codec_data_size);
-
-        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
-            int coded_frame_size, fscode, sample_rate;
-            sample_rate = stream->enc->sample_rate;
-            coded_frame_size = (stream->enc->bit_rate *
-                                stream->enc->frame_size) / (8 * sample_rate);
-            /* audio codec info */
-            put_tag(s, ".ra");
-            put_byte(s, 0xfd);
-            put_be32(s, 0x00040000); /* version */
-            put_tag(s, ".ra4");
-            put_be32(s, 0x01b53530); /* stream length */
-            put_be16(s, 4); /* unknown */
-            put_be32(s, 0x39); /* header size */
-
-            switch(sample_rate) {
-            case 48000:
-            case 24000:
-            case 12000:
-                fscode = 1;
-                break;
-            default:
-            case 44100:
-            case 22050:
-            case 11025:
-                fscode = 2;
-                break;
-            case 32000:
-            case 16000:
-            case 8000:
-                fscode = 3;
-            }
-            put_be16(s, fscode); /* codec additional info, for AC3, seems
-                                     to be a frequency code */
-            /* special hack to compensate rounding errors... */
-            if (coded_frame_size == 557)
-                coded_frame_size--;
-            put_be32(s, coded_frame_size); /* frame length */
-            put_be32(s, 0x51540); /* unknown */
-            put_be32(s, 0x249f0); /* unknown */
-            put_be32(s, 0x249f0); /* unknown */
-            put_be16(s, 0x01);
-            /* frame length : seems to be very important */
-            put_be16(s, coded_frame_size);
-            put_be32(s, 0); /* unknown */
-            put_be16(s, stream->enc->sample_rate); /* sample rate */
-            put_be32(s, 0x10); /* unknown */
-            put_be16(s, stream->enc->channels);
-            put_str8(s, "Int0"); /* codec name */
-            put_str8(s, "dnet"); /* codec name */
-            put_be16(s, 0); /* title length */
-            put_be16(s, 0); /* author length */
-            put_be16(s, 0); /* copyright length */
-            put_byte(s, 0); /* end of header */
-        } else {
-            /* video codec info */
-            put_be32(s,34); /* size */
-            if(stream->enc->codec_id == CODEC_ID_RV10)
-                put_tag(s,"VIDORV10");
-            else
-                put_tag(s,"VIDORV20");
-            put_be16(s, stream->enc->width);
-            put_be16(s, stream->enc->height);
-            put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */
-            put_be32(s,0);     /* unknown meaning */
-            put_be16(s, (int) stream->frame_rate);  /* unknown meaning */
-            put_be32(s,0);     /* unknown meaning */
-            put_be16(s, 8);    /* unknown meaning */
-            /* Seems to be the codec version: only use basic H263. The next
-               versions seems to add a diffential DC coding as in
-               MPEG... nothing new under the sun */
-            if(stream->enc->codec_id == CODEC_ID_RV10)
-                put_be32(s,0x10000000);
-            else
-                put_be32(s,0x20103001);
-            //put_be32(s,0x10003000);
-        }
-    }
-
-    /* patch data offset field */
-    data_pos = s->buf_ptr - start_ptr;
-    rm->data_pos = data_pos;
-    data_offset_ptr[0] = data_pos >> 24;
-    data_offset_ptr[1] = data_pos >> 16;
-    data_offset_ptr[2] = data_pos >> 8;
-    data_offset_ptr[3] = data_pos;
-
-    /* data stream */
-    put_tag(s,"DATA");
-    put_be32(s,data_size + 10 + 8);
-    put_be16(s,0);
-
-    put_be32(s, nb_packets); /* number of packets */
-    put_be32(s,0); /* next data header */
-}
-
-static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
-                                int length, int key_frame)
-{
-    int timestamp;
-    ByteIOContext *s = &ctx->pb;
-
-    stream->nb_packets++;
-    stream->packet_total_size += length;
-    if (length > stream->packet_max_size)
-        stream->packet_max_size =  length;
-
-    put_be16(s,0); /* version */
-    put_be16(s,length + 12);
-    put_be16(s, stream->num); /* stream number */
-    timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
-    put_be32(s, timestamp); /* timestamp */
-    put_byte(s, 0); /* reserved */
-    put_byte(s, key_frame ? 2 : 0); /* flags */
-}
-
-static int rm_write_header(AVFormatContext *s)
-{
-    RMContext *rm = s->priv_data;
-    StreamInfo *stream;
-    int n;
-    AVCodecContext *codec;
-
-    for(n=0;n<s->nb_streams;n++) {
-        s->streams[n]->id = n;
-        codec = s->streams[n]->codec;
-        stream = &rm->streams[n];
-        memset(stream, 0, sizeof(StreamInfo));
-        stream->num = n;
-        stream->bit_rate = codec->bit_rate;
-        stream->enc = codec;
-
-        switch(codec->codec_type) {
-        case CODEC_TYPE_AUDIO:
-            rm->audio_stream = stream;
-            stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
-            /* XXX: dummy values */
-            stream->packet_max_size = 1024;
-            stream->nb_packets = 0;
-            stream->total_frames = stream->nb_packets;
-            break;
-        case CODEC_TYPE_VIDEO:
-            rm->video_stream = stream;
-            stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
-            /* XXX: dummy values */
-            stream->packet_max_size = 4096;
-            stream->nb_packets = 0;
-            stream->total_frames = stream->nb_packets;
-            break;
-        default:
-            return -1;
-        }
-    }
-
-    rv10_write_header(s, 0, 0);
-    put_flush_packet(&s->pb);
-    return 0;
-}
-
-static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
-{
-    uint8_t *buf1;
-    RMContext *rm = s->priv_data;
-    ByteIOContext *pb = &s->pb;
-    StreamInfo *stream = rm->audio_stream;
-    int i;
-
-    /* XXX: suppress this malloc */
-    buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );
-
-    write_packet_header(s, stream, size, !!(flags & PKT_FLAG_KEY));
-
-    /* for AC3, the words seems to be reversed */
-    for(i=0;i<size;i+=2) {
-        buf1[i] = buf[i+1];
-        buf1[i+1] = buf[i];
-    }
-    put_buffer(pb, buf1, size);
-    put_flush_packet(pb);
-    stream->nb_frames++;
-    av_free(buf1);
-    return 0;
-}
-
-static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
-{
-    RMContext *rm = s->priv_data;
-    ByteIOContext *pb = &s->pb;
-    StreamInfo *stream = rm->video_stream;
-    int key_frame = !!(flags & PKT_FLAG_KEY);
-
-    /* XXX: this is incorrect: should be a parameter */
-
-    /* Well, I spent some time finding the meaning of these bits. I am
-       not sure I understood everything, but it works !! */
-#if 1
-    write_packet_header(s, stream, size + 7, key_frame);
-    /* bit 7: '1' if final packet of a frame converted in several packets */
-    put_byte(pb, 0x81);
-    /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
-       frame starting from 1 */
-    if (key_frame) {
-        put_byte(pb, 0x81);
-    } else {
-        put_byte(pb, 0x01);
-    }
-    put_be16(pb, 0x4000 + (size)); /* total frame size */
-    put_be16(pb, 0x4000 + (size));              /* offset from the start or the end */
-#else
-    /* full frame */
-    write_packet_header(s, size + 6);
-    put_byte(pb, 0xc0);
-    put_be16(pb, 0x4000 + size); /* total frame size */
-    put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
-#endif
-    put_byte(pb, stream->nb_frames & 0xff);
-
-    put_buffer(pb, buf, size);
-    put_flush_packet(pb);
-
-    stream->nb_frames++;
-    return 0;
-}
-
-static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
-{
-    if (s->streams[pkt->stream_index]->codec->codec_type ==
-        CODEC_TYPE_AUDIO)
-        return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
-    else
-        return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
-}
-
-static int rm_write_trailer(AVFormatContext *s)
-{
-    RMContext *rm = s->priv_data;
-    int data_size, index_pos, i;
-    ByteIOContext *pb = &s->pb;
-
-    if (!url_is_streamed(&s->pb)) {
-        /* end of file: finish to write header */
-        index_pos = url_fseek(pb, 0, SEEK_CUR);
-        data_size = index_pos - rm->data_pos;
-
-        /* index */
-        put_tag(pb, "INDX");
-        put_be32(pb, 10 + 10 * s->nb_streams);
-        put_be16(pb, 0);
-
-        for(i=0;i<s->nb_streams;i++) {
-            put_be32(pb, 0); /* zero indices */
-            put_be16(pb, i); /* stream number */
-            put_be32(pb, 0); /* next index */
-        }
-        /* undocumented end header */
-        put_be32(pb, 0);
-        put_be32(pb, 0);
-
-        url_fseek(pb, 0, SEEK_SET);
-        for(i=0;i<s->nb_streams;i++)
-            rm->streams[i].total_frames = rm->streams[i].nb_frames;
-        rv10_write_header(s, data_size, index_pos);
-    } else {
-        /* undocumented end header */
-        put_be32(pb, 0);
-        put_be32(pb, 0);
-    }
-    put_flush_packet(pb);
-    return 0;
-}
-#endif //CONFIG_MUXERS
-
-/***************************************************/
 
 static void get_str(ByteIOContext *pb, char *buf, int buf_size)
 {
@@ -1119,7 +683,6 @@ static int64_t rm_read_dts(AVFormatContext *s, int stream_index,
     return dts;
 }
 
-#ifdef CONFIG_RM_DEMUXER
 AVInputFormat rm_demuxer = {
     "rm",
     "rm format",
@@ -1131,18 +694,3 @@ AVInputFormat rm_demuxer = {
     NULL,
     rm_read_dts,
 };
-#endif
-#ifdef CONFIG_RM_MUXER
-AVOutputFormat rm_muxer = {
-    "rm",
-    "rm format",
-    "application/vnd.rn-realmedia",
-    "rm,ra",
-    sizeof(RMContext),
-    CODEC_ID_AC3,
-    CODEC_ID_RV10,
-    rm_write_header,
-    rm_write_packet,
-    rm_write_trailer,
-};
-#endif
diff --git a/libavformat/rmenc.c b/libavformat/rmenc.c
new file mode 100644
index 0000000000..74f944317c
--- /dev/null
+++ b/libavformat/rmenc.c
@@ -0,0 +1,439 @@
+/*
+ * "Real" compatible muxer.
+ * 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 "avformat.h"
+#include "rm.h"
+
+/* in ms */
+#define BUFFER_DURATION 0
+
+
+static void put_str(ByteIOContext *s, const char *tag)
+{
+    put_be16(s,strlen(tag));
+    while (*tag) {
+        put_byte(s, *tag++);
+    }
+}
+
+static void put_str8(ByteIOContext *s, const char *tag)
+{
+    put_byte(s, strlen(tag));
+    while (*tag) {
+        put_byte(s, *tag++);
+    }
+}
+
+static void rv10_write_header(AVFormatContext *ctx,
+                              int data_size, int index_pos)
+{
+    RMContext *rm = ctx->priv_data;
+    ByteIOContext *s = &ctx->pb;
+    StreamInfo *stream;
+    unsigned char *data_offset_ptr, *start_ptr;
+    const char *desc, *mimetype;
+    int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
+    int bit_rate, v, duration, flags, data_pos;
+
+    start_ptr = s->buf_ptr;
+
+    put_tag(s, ".RMF");
+    put_be32(s,18); /* header size */
+    put_be16(s,0);
+    put_be32(s,0);
+    put_be32(s,4 + ctx->nb_streams); /* num headers */
+
+    put_tag(s,"PROP");
+    put_be32(s, 50);
+    put_be16(s, 0);
+    packet_max_size = 0;
+    packet_total_size = 0;
+    nb_packets = 0;
+    bit_rate = 0;
+    duration = 0;
+    for(i=0;i<ctx->nb_streams;i++) {
+        StreamInfo *stream = &rm->streams[i];
+        bit_rate += stream->bit_rate;
+        if (stream->packet_max_size > packet_max_size)
+            packet_max_size = stream->packet_max_size;
+        nb_packets += stream->nb_packets;
+        packet_total_size += stream->packet_total_size;
+        /* select maximum duration */
+        v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
+        if (v > duration)
+            duration = v;
+    }
+    put_be32(s, bit_rate); /* max bit rate */
+    put_be32(s, bit_rate); /* avg bit rate */
+    put_be32(s, packet_max_size);        /* max packet size */
+    if (nb_packets > 0)
+        packet_avg_size = packet_total_size / nb_packets;
+    else
+        packet_avg_size = 0;
+    put_be32(s, packet_avg_size);        /* avg packet size */
+    put_be32(s, nb_packets);  /* num packets */
+    put_be32(s, duration); /* duration */
+    put_be32(s, BUFFER_DURATION);           /* preroll */
+    put_be32(s, index_pos);           /* index offset */
+    /* computation of data the data offset */
+    data_offset_ptr = s->buf_ptr;
+    put_be32(s, 0);           /* data offset : will be patched after */
+    put_be16(s, ctx->nb_streams);    /* num streams */
+    flags = 1 | 2; /* save allowed & perfect play */
+    if (url_is_streamed(s))
+        flags |= 4; /* live broadcast */
+    put_be16(s, flags);
+
+    /* comments */
+
+    put_tag(s,"CONT");
+    size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) +
+        strlen(ctx->comment) + 4 * 2 + 10;
+    put_be32(s,size);
+    put_be16(s,0);
+    put_str(s, ctx->title);
+    put_str(s, ctx->author);
+    put_str(s, ctx->copyright);
+    put_str(s, ctx->comment);
+
+    for(i=0;i<ctx->nb_streams;i++) {
+        int codec_data_size;
+
+        stream = &rm->streams[i];
+
+        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
+            desc = "The Audio Stream";
+            mimetype = "audio/x-pn-realaudio";
+            codec_data_size = 73;
+        } else {
+            desc = "The Video Stream";
+            mimetype = "video/x-pn-realvideo";
+            codec_data_size = 34;
+        }
+
+        put_tag(s,"MDPR");
+        size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
+        put_be32(s, size);
+        put_be16(s, 0);
+
+        put_be16(s, i); /* stream number */
+        put_be32(s, stream->bit_rate); /* max bit rate */
+        put_be32(s, stream->bit_rate); /* avg bit rate */
+        put_be32(s, stream->packet_max_size);        /* max packet size */
+        if (stream->nb_packets > 0)
+            packet_avg_size = stream->packet_total_size /
+                stream->nb_packets;
+        else
+            packet_avg_size = 0;
+        put_be32(s, packet_avg_size);        /* avg packet size */
+        put_be32(s, 0);           /* start time */
+        put_be32(s, BUFFER_DURATION);           /* preroll */
+        /* duration */
+        if (url_is_streamed(s) || !stream->total_frames)
+            put_be32(s, (int)(3600 * 1000));
+        else
+            put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
+        put_str8(s, desc);
+        put_str8(s, mimetype);
+        put_be32(s, codec_data_size);
+
+        if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
+            int coded_frame_size, fscode, sample_rate;
+            sample_rate = stream->enc->sample_rate;
+            coded_frame_size = (stream->enc->bit_rate *
+                                stream->enc->frame_size) / (8 * sample_rate);
+            /* audio codec info */
+            put_tag(s, ".ra");
+            put_byte(s, 0xfd);
+            put_be32(s, 0x00040000); /* version */
+            put_tag(s, ".ra4");
+            put_be32(s, 0x01b53530); /* stream length */
+            put_be16(s, 4); /* unknown */
+            put_be32(s, 0x39); /* header size */
+
+            switch(sample_rate) {
+            case 48000:
+            case 24000:
+            case 12000:
+                fscode = 1;
+                break;
+            default:
+            case 44100:
+            case 22050:
+            case 11025:
+                fscode = 2;
+                break;
+            case 32000:
+            case 16000:
+            case 8000:
+                fscode = 3;
+            }
+            put_be16(s, fscode); /* codec additional info, for AC3, seems
+                                     to be a frequency code */
+            /* special hack to compensate rounding errors... */
+            if (coded_frame_size == 557)
+                coded_frame_size--;
+            put_be32(s, coded_frame_size); /* frame length */
+            put_be32(s, 0x51540); /* unknown */
+            put_be32(s, 0x249f0); /* unknown */
+            put_be32(s, 0x249f0); /* unknown */
+            put_be16(s, 0x01);
+            /* frame length : seems to be very important */
+            put_be16(s, coded_frame_size);
+            put_be32(s, 0); /* unknown */
+            put_be16(s, stream->enc->sample_rate); /* sample rate */
+            put_be32(s, 0x10); /* unknown */
+            put_be16(s, stream->enc->channels);
+            put_str8(s, "Int0"); /* codec name */
+            put_str8(s, "dnet"); /* codec name */
+            put_be16(s, 0); /* title length */
+            put_be16(s, 0); /* author length */
+            put_be16(s, 0); /* copyright length */
+            put_byte(s, 0); /* end of header */
+        } else {
+            /* video codec info */
+            put_be32(s,34); /* size */
+            if(stream->enc->codec_id == CODEC_ID_RV10)
+                put_tag(s,"VIDORV10");
+            else
+                put_tag(s,"VIDORV20");
+            put_be16(s, stream->enc->width);
+            put_be16(s, stream->enc->height);
+            put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */
+            put_be32(s,0);     /* unknown meaning */
+            put_be16(s, (int) stream->frame_rate);  /* unknown meaning */
+            put_be32(s,0);     /* unknown meaning */
+            put_be16(s, 8);    /* unknown meaning */
+            /* Seems to be the codec version: only use basic H263. The next
+               versions seems to add a diffential DC coding as in
+               MPEG... nothing new under the sun */
+            if(stream->enc->codec_id == CODEC_ID_RV10)
+                put_be32(s,0x10000000);
+            else
+                put_be32(s,0x20103001);
+            //put_be32(s,0x10003000);
+        }
+    }
+
+    /* patch data offset field */
+    data_pos = s->buf_ptr - start_ptr;
+    rm->data_pos = data_pos;
+    data_offset_ptr[0] = data_pos >> 24;
+    data_offset_ptr[1] = data_pos >> 16;
+    data_offset_ptr[2] = data_pos >> 8;
+    data_offset_ptr[3] = data_pos;
+
+    /* data stream */
+    put_tag(s,"DATA");
+    put_be32(s,data_size + 10 + 8);
+    put_be16(s,0);
+
+    put_be32(s, nb_packets); /* number of packets */
+    put_be32(s,0); /* next data header */
+}
+
+static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
+                                int length, int key_frame)
+{
+    int timestamp;
+    ByteIOContext *s = &ctx->pb;
+
+    stream->nb_packets++;
+    stream->packet_total_size += length;
+    if (length > stream->packet_max_size)
+        stream->packet_max_size =  length;
+
+    put_be16(s,0); /* version */
+    put_be16(s,length + 12);
+    put_be16(s, stream->num); /* stream number */
+    timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
+    put_be32(s, timestamp); /* timestamp */
+    put_byte(s, 0); /* reserved */
+    put_byte(s, key_frame ? 2 : 0); /* flags */
+}
+
+static int rm_write_header(AVFormatContext *s)
+{
+    RMContext *rm = s->priv_data;
+    StreamInfo *stream;
+    int n;
+    AVCodecContext *codec;
+
+    for(n=0;n<s->nb_streams;n++) {
+        s->streams[n]->id = n;
+        codec = s->streams[n]->codec;
+        stream = &rm->streams[n];
+        memset(stream, 0, sizeof(StreamInfo));
+        stream->num = n;
+        stream->bit_rate = codec->bit_rate;
+        stream->enc = codec;
+
+        switch(codec->codec_type) {
+        case CODEC_TYPE_AUDIO:
+            rm->audio_stream = stream;
+            stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
+            /* XXX: dummy values */
+            stream->packet_max_size = 1024;
+            stream->nb_packets = 0;
+            stream->total_frames = stream->nb_packets;
+            break;
+        case CODEC_TYPE_VIDEO:
+            rm->video_stream = stream;
+            stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
+            /* XXX: dummy values */
+            stream->packet_max_size = 4096;
+            stream->nb_packets = 0;
+            stream->total_frames = stream->nb_packets;
+            break;
+        default:
+            return -1;
+        }
+    }
+
+    rv10_write_header(s, 0, 0);
+    put_flush_packet(&s->pb);
+    return 0;
+}
+
+static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
+{
+    uint8_t *buf1;
+    RMContext *rm = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    StreamInfo *stream = rm->audio_stream;
+    int i;
+
+    /* XXX: suppress this malloc */
+    buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );
+
+    write_packet_header(s, stream, size, !!(flags & PKT_FLAG_KEY));
+
+    /* for AC3, the words seems to be reversed */
+    for(i=0;i<size;i+=2) {
+        buf1[i] = buf[i+1];
+        buf1[i+1] = buf[i];
+    }
+    put_buffer(pb, buf1, size);
+    put_flush_packet(pb);
+    stream->nb_frames++;
+    av_free(buf1);
+    return 0;
+}
+
+static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
+{
+    RMContext *rm = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+    StreamInfo *stream = rm->video_stream;
+    int key_frame = !!(flags & PKT_FLAG_KEY);
+
+    /* XXX: this is incorrect: should be a parameter */
+
+    /* Well, I spent some time finding the meaning of these bits. I am
+       not sure I understood everything, but it works !! */
+#if 1
+    write_packet_header(s, stream, size + 7, key_frame);
+    /* bit 7: '1' if final packet of a frame converted in several packets */
+    put_byte(pb, 0x81);
+    /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
+       frame starting from 1 */
+    if (key_frame) {
+        put_byte(pb, 0x81);
+    } else {
+        put_byte(pb, 0x01);
+    }
+    put_be16(pb, 0x4000 + (size)); /* total frame size */
+    put_be16(pb, 0x4000 + (size));              /* offset from the start or the end */
+#else
+    /* full frame */
+    write_packet_header(s, size + 6);
+    put_byte(pb, 0xc0);
+    put_be16(pb, 0x4000 + size); /* total frame size */
+    put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
+#endif
+    put_byte(pb, stream->nb_frames & 0xff);
+
+    put_buffer(pb, buf, size);
+    put_flush_packet(pb);
+
+    stream->nb_frames++;
+    return 0;
+}
+
+static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    if (s->streams[pkt->stream_index]->codec->codec_type ==
+        CODEC_TYPE_AUDIO)
+        return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
+    else
+        return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
+}
+
+static int rm_write_trailer(AVFormatContext *s)
+{
+    RMContext *rm = s->priv_data;
+    int data_size, index_pos, i;
+    ByteIOContext *pb = &s->pb;
+
+    if (!url_is_streamed(&s->pb)) {
+        /* end of file: finish to write header */
+        index_pos = url_fseek(pb, 0, SEEK_CUR);
+        data_size = index_pos - rm->data_pos;
+
+        /* index */
+        put_tag(pb, "INDX");
+        put_be32(pb, 10 + 10 * s->nb_streams);
+        put_be16(pb, 0);
+
+        for(i=0;i<s->nb_streams;i++) {
+            put_be32(pb, 0); /* zero indices */
+            put_be16(pb, i); /* stream number */
+            put_be32(pb, 0); /* next index */
+        }
+        /* undocumented end header */
+        put_be32(pb, 0);
+        put_be32(pb, 0);
+
+        url_fseek(pb, 0, SEEK_SET);
+        for(i=0;i<s->nb_streams;i++)
+            rm->streams[i].total_frames = rm->streams[i].nb_frames;
+        rv10_write_header(s, data_size, index_pos);
+    } else {
+        /* undocumented end header */
+        put_be32(pb, 0);
+        put_be32(pb, 0);
+    }
+    put_flush_packet(pb);
+    return 0;
+}
+
+
+AVOutputFormat rm_muxer = {
+    "rm",
+    "rm format",
+    "application/vnd.rn-realmedia",
+    "rm,ra",
+    sizeof(RMContext),
+    CODEC_ID_AC3,
+    CODEC_ID_RV10,
+    rm_write_header,
+    rm_write_packet,
+    rm_write_trailer,
+};