Initial revision

Originally committed as revision 2 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 498 insertions, 0 deletions

diff --git a/rmenc.c b/rmenc.c
new file mode 100644
index 0000000000..60a3b2a3ad
--- /dev/null
+++ b/rmenc.c
@@ -0,0 +1,498 @@
+/*
+ * RV 1.0 compatible encoder.
+ * Copyright (c) 2000 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 <stdio.h>
+#include <netinet/in.h>
+#include <string.h>
+#include "mpegenc.h"
+#include "mpegvideo.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;
+    AVEncodeContext *enc;
+} StreamInfo;
+
+typedef struct {
+    StreamInfo streams[2];
+    StreamInfo *audio_stream, *video_stream;
+    int nb_streams;
+    int data_pos; /* position of the data after the header */
+} RMContext;
+
+static void put_long(PutByteContext *s, unsigned int val)
+{
+    put_byte(s, val >> 24);
+    put_byte(s, val >> 16);
+    put_byte(s, val >> 8);
+    put_byte(s, val);
+}
+
+static void put_short(PutByteContext *s, unsigned int val)
+{
+    put_byte(s, val >> 8);
+    put_byte(s, val);
+}
+
+static void put_str(PutByteContext *s, const char *tag)
+{
+    put_short(s,strlen(tag));
+    while (*tag) {
+        put_byte(s, *tag++);
+    }
+}
+
+static void put_str8(PutByteContext *s, const char *tag)
+{
+    put_byte(s, strlen(tag));
+    while (*tag) {
+        put_byte(s, *tag++);
+    }
+}
+
+int find_tag(const char *tag, char *buf, int buf_size, const char *str)
+{
+    int len = strlen(tag);
+    char *q;
+
+    buf[0] = '\0';
+    while (*str) {
+        if (*str == '+' && !strncmp(str + 1, tag, len) && str[len+1] == '=') {
+            str += len + 2;
+            q = buf;
+            while (*str && *str != '+' && (q - buf) < (buf_size - 1)) {
+                *q++ = *str++;
+            }
+            /* remove trailing spaces */
+            while (q > buf && q[-1] == ' ') q--;
+            *q = '\0';
+            return 1;
+        }
+        str++;
+    }
+    return 0;
+}
+
+static void rv10_write_header(AVFormatContext *ctx, 
+                              int data_size, int index_pos)
+{
+    RMContext *rm = ctx->priv_data;
+    PutByteContext *s = &ctx->pb;
+    StreamInfo *stream;
+    unsigned char *data_offset_ptr, *start_ptr;
+    char title[1024], author[1024], copyright[1024], comment[1024];
+    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_long(s,18); /* header size */
+    put_short(s,0);
+    put_long(s,0);
+    put_long(s,4 + rm->nb_streams); /* num headers */
+
+    put_tag(s,"PROP");
+    put_long(s, 50);
+    put_short(s, 0);
+    packet_max_size = 0;
+    packet_total_size = 0;
+    nb_packets = 0;
+    bit_rate = 0;
+    duration = 0;
+    for(i=0;i<rm->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_long(s, bit_rate); /* max bit rate */
+    put_long(s, bit_rate); /* avg bit rate */
+    put_long(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_long(s, packet_avg_size);        /* avg packet size */
+    put_long(s, nb_packets);  /* num packets */
+    put_long(s, duration); /* duration */
+    put_long(s, BUFFER_DURATION);           /* preroll */
+    put_long(s, index_pos);           /* index offset */
+    /* computation of data the data offset */
+    data_offset_ptr = s->buf_ptr;
+    put_long(s, 0);           /* data offset : will be patched after */
+    put_short(s, rm->nb_streams);    /* num streams */
+    flags = 1 | 2; /* save allowed & perfect play */
+    if (ctx->is_streamed)
+        flags |= 4; /* live broadcast */
+    put_short(s, flags);
+    
+    /* comments */
+    find_tag("title", title, sizeof(title), comment_string);
+    find_tag("author", author, sizeof(author), comment_string);
+    find_tag("copyright", copyright, sizeof(copyright), comment_string);
+    find_tag("comment", comment, sizeof(comment), comment_string);
+
+    put_tag(s,"CONT");
+    size = strlen(title) + strlen(author) + strlen(copyright) + strlen(comment) + 
+        4 * 2 + 10;
+    put_long(s,size);
+    put_short(s,0);
+    put_str(s, title);
+    put_str(s, author);
+    put_str(s, copyright);
+    put_str(s, comment);
+    
+    for(i=0;i<rm->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_long(s, size);
+        put_short(s, 0);
+
+        put_short(s, i); /* stream number */
+        put_long(s, stream->bit_rate); /* max bit rate */
+        put_long(s, stream->bit_rate); /* avg bit rate */
+        put_long(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_long(s, packet_avg_size);        /* avg packet size */
+        put_long(s, 0);           /* start time */
+        put_long(s, BUFFER_DURATION);           /* preroll */
+        /* duration */
+        put_long(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
+        put_str8(s, desc);
+        put_str8(s, mimetype);
+        put_long(s, codec_data_size);
+        
+        if (stream->enc->codec->type == CODEC_TYPE_AUDIO) {
+            int coded_frame_size, fscode, sample_rate;
+            sample_rate = stream->enc->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_long(s, 0x00040000); /* version */
+            put_tag(s, ".ra4");
+            put_long(s, 0x01b53530); /* stream length */
+            put_short(s, 4); /* unknown */
+            put_long(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_short(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_long(s, coded_frame_size); /* frame length */
+            put_long(s, 0x51540); /* unknown */
+            put_long(s, 0x249f0); /* unknown */
+            put_long(s, 0x249f0); /* unknown */
+            put_short(s, 0x01);
+            /* frame length : seems to be very important */
+            put_short(s, coded_frame_size); 
+            put_long(s, 0); /* unknown */
+            put_short(s, stream->enc->rate); /* sample rate */
+            put_long(s, 0x10); /* unknown */
+            put_short(s, stream->enc->channels);
+            put_str8(s, "Int0"); /* codec name */
+            put_str8(s, "dnet"); /* codec name */
+            put_short(s, 0); /* title length */
+            put_short(s, 0); /* author length */
+            put_short(s, 0); /* copyright length */
+            put_byte(s, 0); /* end of header */
+        } else {
+            /* video codec info */
+            put_long(s,34); /* size */
+            put_tag(s,"VIDORV10");
+            put_short(s, stream->enc->width);
+            put_short(s, stream->enc->height);
+            put_short(s, 24); /* frames per seconds ? */
+            put_long(s,0);     /* unknown meaning */
+            put_short(s, 12);  /* unknown meaning */
+            put_long(s,0);     /* unknown meaning */
+            put_short(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_long(s,0x10000000); 
+            //put_long(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_long(s,data_size + 10 + 8);
+    put_short(s,0);
+
+    put_long(s, nb_packets); /* number of packets */
+    put_long(s,0); /* next data header */
+}
+
+static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, 
+                                int length, int key_frame)
+{
+    int timestamp;
+    PutByteContext *s = &ctx->pb;
+
+    stream->nb_packets++;
+    stream->packet_total_size += length;
+    if (length > stream->packet_max_size)
+        stream->packet_max_size =  length;
+
+    put_short(s,0); /* version */
+    put_short(s,length + 12);
+    put_short(s, stream->num); /* stream number */
+    timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
+    put_long(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;
+
+    rm = malloc(sizeof(RMContext));
+    if (!rm)
+        return -1;
+    memset(rm, 0, sizeof(RMContext));
+    s->priv_data = rm;
+    n = 0;
+    if (s->audio_enc) {
+        stream = &rm->streams[n];
+        memset(stream, 0, sizeof(StreamInfo));
+        stream->num = n;
+        rm->audio_stream = stream;
+        stream->bit_rate = s->audio_enc->bit_rate;
+        stream->frame_rate = (float)s->audio_enc->rate / (float)s->audio_enc->frame_size;
+        stream->enc = s->audio_enc;
+        /* XXX: dummy values */
+        stream->packet_max_size = 1024;
+        stream->nb_packets = 1000;
+        stream->total_frames = stream->nb_packets;
+        n++;
+    }
+    if (s->video_enc) {
+        stream = &rm->streams[n];
+        memset(stream, 0, sizeof(StreamInfo));
+        stream->num = n;
+        rm->video_stream = stream;
+        stream->bit_rate = s->video_enc->bit_rate;
+        stream->frame_rate = s->video_enc->rate;
+        stream->enc = s->video_enc;
+        /* XXX: dummy values */
+        stream->packet_max_size = 4096;
+        stream->nb_packets = 1000;
+        stream->total_frames = stream->nb_packets;
+        n++;
+    }
+    rm->nb_streams = n;
+
+    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;
+    PutByteContext *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;
+    PutByteContext *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_short(pb, 0x4000 | (size)); /* total frame size */
+    put_short(pb, 0x4000 | (size));              /* offset from the start or the end */
+#else
+    /* seems to be used for prefetch/error correction. Help me ! */
+    write_packet_header(s, size + 6);
+    put_byte(pb, 0xc0); 
+    put_short(pb, 0x4000 | size); /* total frame size */
+    put_short(pb, 0x4000 + packet_number * 126);
+#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_trailer(AVFormatContext *s)
+{
+    RMContext *rm = s->priv_data;
+    int data_size, index_pos, i;
+    PutByteContext *pb = &s->pb;
+
+    if (!s->is_streamed) {
+        /* end of file: finish to write header */
+        index_pos = put_seek(pb, 0, SEEK_CUR);
+        data_size = index_pos - rm->data_pos;
+
+        /* index */
+        put_tag(pb, "INDX");
+        put_long(pb, 10 + 10 * rm->nb_streams);
+        put_short(pb, 0);
+        
+        for(i=0;i<rm->nb_streams;i++) {
+            put_long(pb, 0); /* zero indices */
+            put_short(pb, i); /* stream number */
+            put_long(pb, 0); /* next index */
+        }
+        /* undocumented end header */
+        put_long(pb, 0);
+        put_long(pb, 0);
+        
+        put_seek(pb, 0, SEEK_SET);
+        for(i=0;i<rm->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_long(pb, 0);
+        put_long(pb, 0);
+    }
+    put_flush_packet(pb);
+
+    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_audio,
+    rm_write_video,
+    rm_write_trailer,
+};
+
+AVFormat ra_format = {
+    "ra",
+    "ra format",
+    "audio/x-pn-realaudio",
+    "ra",
+    CODEC_ID_AC3,
+    CODEC_ID_NONE,
+    rm_write_header,
+    rm_write_audio,
+    NULL,
+    rm_write_trailer,
+};