2 * "Real" compatible mux and demux.
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 #define BUFFER_DURATION 0
26 int packet_total_size;
28 /* codec related output */
31 int nb_frames; /* current frame number */
32 int total_frames; /* total number of frames */
38 StreamInfo streams[2];
39 StreamInfo *audio_stream, *video_stream;
40 int data_pos; /* position of the data after the header */
45 static void put_str(ByteIOContext *s, const char *tag)
47 put_be16(s,strlen(tag));
53 static void put_str8(ByteIOContext *s, const char *tag)
55 put_byte(s, strlen(tag));
61 static void rv10_write_header(AVFormatContext *ctx,
62 int data_size, int index_pos)
64 RMContext *rm = ctx->priv_data;
65 ByteIOContext *s = &ctx->pb;
67 unsigned char *data_offset_ptr, *start_ptr;
68 const char *desc, *mimetype;
69 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
70 int bit_rate, v, duration, flags, data_pos;
72 start_ptr = s->buf_ptr;
75 put_be32(s,18); /* header size */
78 put_be32(s,4 + ctx->nb_streams); /* num headers */
84 packet_total_size = 0;
88 for(i=0;i<ctx->nb_streams;i++) {
89 StreamInfo *stream = &rm->streams[i];
90 bit_rate += stream->bit_rate;
91 if (stream->packet_max_size > packet_max_size)
92 packet_max_size = stream->packet_max_size;
93 nb_packets += stream->nb_packets;
94 packet_total_size += stream->packet_total_size;
95 /* select maximum duration */
96 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
100 put_be32(s, bit_rate); /* max bit rate */
101 put_be32(s, bit_rate); /* avg bit rate */
102 put_be32(s, packet_max_size); /* max packet size */
104 packet_avg_size = packet_total_size / nb_packets;
107 put_be32(s, packet_avg_size); /* avg packet size */
108 put_be32(s, nb_packets); /* num packets */
109 put_be32(s, duration); /* duration */
110 put_be32(s, BUFFER_DURATION); /* preroll */
111 put_be32(s, index_pos); /* index offset */
112 /* computation of data the data offset */
113 data_offset_ptr = s->buf_ptr;
114 put_be32(s, 0); /* data offset : will be patched after */
115 put_be16(s, ctx->nb_streams); /* num streams */
116 flags = 1 | 2; /* save allowed & perfect play */
117 if (url_is_streamed(s))
118 flags |= 4; /* live broadcast */
124 size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) +
125 strlen(ctx->comment) + 4 * 2 + 10;
128 put_str(s, ctx->title);
129 put_str(s, ctx->author);
130 put_str(s, ctx->copyright);
131 put_str(s, ctx->comment);
133 for(i=0;i<ctx->nb_streams;i++) {
136 stream = &rm->streams[i];
138 if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
139 desc = "The Audio Stream";
140 mimetype = "audio/x-pn-realaudio";
141 codec_data_size = 73;
143 desc = "The Video Stream";
144 mimetype = "video/x-pn-realvideo";
145 codec_data_size = 34;
149 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
153 put_be16(s, i); /* stream number */
154 put_be32(s, stream->bit_rate); /* max bit rate */
155 put_be32(s, stream->bit_rate); /* avg bit rate */
156 put_be32(s, stream->packet_max_size); /* max packet size */
157 if (stream->nb_packets > 0)
158 packet_avg_size = stream->packet_total_size /
162 put_be32(s, packet_avg_size); /* avg packet size */
163 put_be32(s, 0); /* start time */
164 put_be32(s, BUFFER_DURATION); /* preroll */
166 if (url_is_streamed(s) || !stream->total_frames)
167 put_be32(s, (int)(3600 * 1000));
169 put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
171 put_str8(s, mimetype);
172 put_be32(s, codec_data_size);
174 if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
175 int coded_frame_size, fscode, sample_rate;
176 sample_rate = stream->enc->sample_rate;
177 coded_frame_size = (stream->enc->bit_rate *
178 stream->enc->frame_size) / (8 * sample_rate);
179 /* audio codec info */
182 put_be32(s, 0x00040000); /* version */
184 put_be32(s, 0x01b53530); /* stream length */
185 put_be16(s, 4); /* unknown */
186 put_be32(s, 0x39); /* header size */
188 switch(sample_rate) {
205 put_be16(s, fscode); /* codec additional info, for AC3, seems
206 to be a frequency code */
207 /* special hack to compensate rounding errors... */
208 if (coded_frame_size == 557)
210 put_be32(s, coded_frame_size); /* frame length */
211 put_be32(s, 0x51540); /* unknown */
212 put_be32(s, 0x249f0); /* unknown */
213 put_be32(s, 0x249f0); /* unknown */
215 /* frame length : seems to be very important */
216 put_be16(s, coded_frame_size);
217 put_be32(s, 0); /* unknown */
218 put_be16(s, stream->enc->sample_rate); /* sample rate */
219 put_be32(s, 0x10); /* unknown */
220 put_be16(s, stream->enc->channels);
221 put_str8(s, "Int0"); /* codec name */
222 put_str8(s, "dnet"); /* codec name */
223 put_be16(s, 0); /* title length */
224 put_be16(s, 0); /* author length */
225 put_be16(s, 0); /* copyright length */
226 put_byte(s, 0); /* end of header */
228 /* video codec info */
229 put_be32(s,34); /* size */
230 put_tag(s,"VIDORV10");
231 put_be16(s, stream->enc->width);
232 put_be16(s, stream->enc->height);
233 put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */
234 put_be32(s,0); /* unknown meaning */
235 put_be16(s, (int) stream->frame_rate); /* unknown meaning */
236 put_be32(s,0); /* unknown meaning */
237 put_be16(s, 8); /* unknown meaning */
238 /* Seems to be the codec version: only use basic H263. The next
239 versions seems to add a diffential DC coding as in
240 MPEG... nothing new under the sun */
241 put_be32(s,0x10000000);
242 //put_be32(s,0x10003000);
246 /* patch data offset field */
247 data_pos = s->buf_ptr - start_ptr;
248 rm->data_pos = data_pos;
249 data_offset_ptr[0] = data_pos >> 24;
250 data_offset_ptr[1] = data_pos >> 16;
251 data_offset_ptr[2] = data_pos >> 8;
252 data_offset_ptr[3] = data_pos;
256 put_be32(s,data_size + 10 + 8);
259 put_be32(s, nb_packets); /* number of packets */
260 put_be32(s,0); /* next data header */
263 static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
264 int length, int key_frame)
267 ByteIOContext *s = &ctx->pb;
269 stream->nb_packets++;
270 stream->packet_total_size += length;
271 if (length > stream->packet_max_size)
272 stream->packet_max_size = length;
274 put_be16(s,0); /* version */
275 put_be16(s,length + 12);
276 put_be16(s, stream->num); /* stream number */
277 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
278 put_be32(s, timestamp); /* timestamp */
279 put_byte(s, 0); /* reserved */
280 put_byte(s, key_frame ? 2 : 0); /* flags */
283 static int rm_write_header(AVFormatContext *s)
285 RMContext *rm = s->priv_data;
288 AVCodecContext *codec;
290 for(n=0;n<s->nb_streams;n++) {
291 s->streams[n]->id = n;
292 codec = &s->streams[n]->codec;
293 stream = &rm->streams[n];
294 memset(stream, 0, sizeof(StreamInfo));
296 stream->bit_rate = codec->bit_rate;
299 switch(codec->codec_type) {
300 case CODEC_TYPE_AUDIO:
301 rm->audio_stream = stream;
302 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
303 /* XXX: dummy values */
304 stream->packet_max_size = 1024;
305 stream->nb_packets = 0;
306 stream->total_frames = stream->nb_packets;
308 case CODEC_TYPE_VIDEO:
309 rm->video_stream = stream;
310 stream->frame_rate = (float)codec->frame_rate / (float)codec->frame_rate_base;
311 /* XXX: dummy values */
312 stream->packet_max_size = 4096;
313 stream->nb_packets = 0;
314 stream->total_frames = stream->nb_packets;
321 rv10_write_header(s, 0, 0);
322 put_flush_packet(&s->pb);
326 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size)
329 RMContext *rm = s->priv_data;
330 ByteIOContext *pb = &s->pb;
331 StreamInfo *stream = rm->audio_stream;
334 /* XXX: suppress this malloc */
335 buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );
337 write_packet_header(s, stream, size, stream->enc->coded_frame->key_frame);
339 /* for AC3, the words seems to be reversed */
340 for(i=0;i<size;i+=2) {
344 put_buffer(pb, buf1, size);
345 put_flush_packet(pb);
351 static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size)
353 RMContext *rm = s->priv_data;
354 ByteIOContext *pb = &s->pb;
355 StreamInfo *stream = rm->video_stream;
356 int key_frame = stream->enc->coded_frame->key_frame;
358 /* XXX: this is incorrect: should be a parameter */
360 /* Well, I spent some time finding the meaning of these bits. I am
361 not sure I understood everything, but it works !! */
363 write_packet_header(s, stream, size + 7, key_frame);
364 /* bit 7: '1' if final packet of a frame converted in several packets */
366 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
367 frame starting from 1 */
373 put_be16(pb, 0x4000 | (size)); /* total frame size */
374 put_be16(pb, 0x4000 | (size)); /* offset from the start or the end */
377 write_packet_header(s, size + 6);
379 put_be16(pb, 0x4000 | size); /* total frame size */
380 put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
382 put_byte(pb, stream->nb_frames & 0xff);
384 put_buffer(pb, buf, size);
385 put_flush_packet(pb);
391 static int rm_write_packet(AVFormatContext *s, int stream_index,
392 const uint8_t *buf, int size, int64_t pts)
394 if (s->streams[stream_index]->codec.codec_type ==
396 return rm_write_audio(s, buf, size);
398 return rm_write_video(s, buf, size);
401 static int rm_write_trailer(AVFormatContext *s)
403 RMContext *rm = s->priv_data;
404 int data_size, index_pos, i;
405 ByteIOContext *pb = &s->pb;
407 if (!url_is_streamed(&s->pb)) {
408 /* end of file: finish to write header */
409 index_pos = url_fseek(pb, 0, SEEK_CUR);
410 data_size = index_pos - rm->data_pos;
414 put_be32(pb, 10 + 10 * s->nb_streams);
417 for(i=0;i<s->nb_streams;i++) {
418 put_be32(pb, 0); /* zero indices */
419 put_be16(pb, i); /* stream number */
420 put_be32(pb, 0); /* next index */
422 /* undocumented end header */
426 url_fseek(pb, 0, SEEK_SET);
427 for(i=0;i<s->nb_streams;i++)
428 rm->streams[i].total_frames = rm->streams[i].nb_frames;
429 rv10_write_header(s, data_size, index_pos);
431 /* undocumented end header */
435 put_flush_packet(pb);
439 /***************************************************/
441 static void get_str(ByteIOContext *pb, char *buf, int buf_size)
449 if (i < buf_size - 1)
455 static void get_str8(ByteIOContext *pb, char *buf, int buf_size)
463 if (i < buf_size - 1)
469 static void rm_read_audio_stream_info(AVFormatContext *s, AVStream *st,
472 ByteIOContext *pb = &s->pb;
478 version = get_be32(pb); /* version */
479 if (((version >> 16) & 0xff) == 3) {
480 /* very old version */
481 for(i = 0; i < 14; i++)
483 get_str8(pb, s->title, sizeof(s->title));
484 get_str8(pb, s->author, sizeof(s->author));
485 get_str8(pb, s->copyright, sizeof(s->copyright));
486 get_str8(pb, s->comment, sizeof(s->comment));
488 get_str8(pb, buf, sizeof(buf));
489 st->codec.sample_rate = 8000;
490 st->codec.channels = 1;
491 st->codec.codec_type = CODEC_TYPE_AUDIO;
492 st->codec.codec_id = CODEC_ID_RA_144;
494 /* old version (4) */
495 get_be32(pb); /* .ra4 */
498 get_be32(pb); /* header size */
499 get_be16(pb); /* add codec info */
500 get_be32(pb); /* coded frame size */
501 get_be32(pb); /* ??? */
502 get_be32(pb); /* ??? */
503 get_be32(pb); /* ??? */
504 get_be16(pb); /* 1 */
505 get_be16(pb); /* coded frame size */
507 st->codec.sample_rate = get_be16(pb);
509 st->codec.channels = get_be16(pb);
510 get_str8(pb, buf, sizeof(buf)); /* desc */
511 get_str8(pb, buf, sizeof(buf)); /* desc */
512 st->codec.codec_type = CODEC_TYPE_AUDIO;
513 if (!strcmp(buf, "dnet")) {
514 st->codec.codec_id = CODEC_ID_AC3;
516 st->codec.codec_id = CODEC_ID_NONE;
517 pstrcpy(st->codec.codec_name, sizeof(st->codec.codec_name),
525 get_str8(pb, s->title, sizeof(s->title));
526 get_str8(pb, s->author, sizeof(s->author));
527 get_str8(pb, s->copyright, sizeof(s->copyright));
528 get_str8(pb, s->comment, sizeof(s->comment));
533 static int rm_read_header_old(AVFormatContext *s, AVFormatParameters *ap)
535 RMContext *rm = s->priv_data;
539 st = av_new_stream(s, 0);
542 rm_read_audio_stream_info(s, st, 1);
548 static int rm_read_header(AVFormatContext *s, AVFormatParameters *ap)
550 RMContext *rm = s->priv_data;
552 ByteIOContext *pb = &s->pb;
554 int tag_size, size, codec_data_size, i;
556 unsigned int h263_hack_version, start_time, duration;
561 if (tag == MKTAG('.', 'r', 'a', 0xfd)) {
562 /* very old .ra format */
563 return rm_read_header_old(s, ap);
564 } else if (tag != MKTAG('.', 'R', 'M', 'F')) {
568 get_be32(pb); /* header size */
571 get_be32(pb); /* number of headers */
577 tag_size = get_be32(pb);
580 printf("tag=%c%c%c%c (%08x) size=%d\n",
591 case MKTAG('P', 'R', 'O', 'P'):
593 get_be32(pb); /* max bit rate */
594 get_be32(pb); /* avg bit rate */
595 get_be32(pb); /* max packet size */
596 get_be32(pb); /* avg packet size */
597 get_be32(pb); /* nb packets */
598 get_be32(pb); /* duration */
599 get_be32(pb); /* preroll */
600 get_be32(pb); /* index offset */
601 get_be32(pb); /* data offset */
602 get_be16(pb); /* nb streams */
603 flags = get_be16(pb); /* flags */
605 case MKTAG('C', 'O', 'N', 'T'):
606 get_str(pb, s->title, sizeof(s->title));
607 get_str(pb, s->author, sizeof(s->author));
608 get_str(pb, s->copyright, sizeof(s->copyright));
609 get_str(pb, s->comment, sizeof(s->comment));
611 case MKTAG('M', 'D', 'P', 'R'):
612 st = av_new_stream(s, 0);
615 st->id = get_be16(pb);
616 get_be32(pb); /* max bit rate */
617 st->codec.bit_rate = get_be32(pb); /* bit rate */
618 get_be32(pb); /* max packet size */
619 get_be32(pb); /* avg packet size */
620 start_time = get_be32(pb); /* start time */
621 get_be32(pb); /* preroll */
622 duration = get_be32(pb); /* duration */
623 st->start_time = start_time * (AV_TIME_BASE / 1000);
624 st->duration = duration * (AV_TIME_BASE / 1000);
625 get_str8(pb, buf, sizeof(buf)); /* desc */
626 get_str8(pb, buf, sizeof(buf)); /* mimetype */
627 codec_data_size = get_be32(pb);
628 codec_pos = url_ftell(pb);
631 if (v == MKTAG(0xfd, 'a', 'r', '.')) {
633 rm_read_audio_stream_info(s, st, 0);
635 if (get_le32(pb) != MKTAG('V', 'I', 'D', 'O')) {
637 fprintf(stderr, "Unsupported video codec\n");
640 st->codec.codec_tag = get_le32(pb);
641 if (st->codec.codec_tag != MKTAG('R', 'V', '1', '0'))
643 st->codec.width = get_be16(pb);
644 st->codec.height = get_be16(pb);
645 st->codec.frame_rate_base= 1;
646 st->codec.frame_rate = get_be16(pb) * st->codec.frame_rate_base;
647 st->codec.codec_type = CODEC_TYPE_VIDEO;
652 /* modification of h263 codec version (!) */
653 h263_hack_version = get_be32(pb);
654 switch(h263_hack_version) {
658 st->codec.sub_id = h263_hack_version;
659 st->codec.codec_id = CODEC_ID_RV10;
663 st->codec.codec_id = CODEC_ID_NONE;
667 /* skip codec info */
668 size = url_ftell(pb) - codec_pos;
669 url_fskip(pb, codec_data_size - size);
671 case MKTAG('D', 'A', 'T', 'A'):
674 /* unknown tag: skip it */
675 url_fskip(pb, tag_size - 10);
680 rm->nb_packets = get_be32(pb); /* number of packets */
681 if (!rm->nb_packets && (flags & 4))
682 rm->nb_packets = 3600 * 25;
683 get_be32(pb); /* next data header */
687 for(i=0;i<s->nb_streams;i++) {
688 av_free(s->streams[i]);
693 static int get_num(ByteIOContext *pb, int *len)
704 return (n << 16) | n1;
708 /* multiple of 20 bytes for ra144 (ugly) */
709 #define RAW_PACKET_SIZE 1000
711 static int rm_read_packet(AVFormatContext *s, AVPacket *pkt)
713 RMContext *rm = s->priv_data;
714 ByteIOContext *pb = &s->pb;
716 int len, num, timestamp, i, tmp, j;
720 if (rm->old_format) {
721 /* just read raw bytes */
722 len = RAW_PACKET_SIZE;
723 av_new_packet(pkt, len);
724 pkt->stream_index = 0;
725 len = get_buffer(pb, pkt->data, len);
734 if (rm->nb_packets == 0)
741 timestamp = get_be32(pb);
742 get_byte(pb); /* reserved */
743 flags = get_byte(pb); /* flags */
748 for(i=0;i<s->nb_streams;i++) {
753 if (i == s->nb_streams) {
754 /* skip packet if unknown number */
759 if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
760 int full_frame, h, pic_num;
763 if ((h & 0xc0) == 0xc0) {
766 len2= get_num(pb, &len);
767 pos = get_num(pb, &len);
768 //printf("pos:%d\n",len);
771 int seq, frame_size, pos;
774 frame_size = get_num(pb, &len);
775 pos = get_num(pb, &len);
776 //printf("seq:%d, size:%d, pos:%d\n",seq,frame_size,pos);
780 pic_num= get_byte(pb);
782 //XXX/FIXME/HACK, demuxer should be fixed to send complete frames ...
783 if(st->codec.slice_offset==NULL)
784 st->codec.slice_offset= (int*)av_malloc(sizeof(int));
785 st->codec.slice_count= full_frame;
786 st->codec.slice_offset[0]= 0;
789 av_new_packet(pkt, len);
790 pkt->stream_index = i;
791 get_buffer(pb, pkt->data, len);
794 /* for AC3, needs to swap bytes */
795 if (st->codec.codec_id == CODEC_ID_AC3) {
797 for(j=0;j<len;j+=2) {
807 static int rm_read_close(AVFormatContext *s)
812 static int rm_probe(AVProbeData *p)
814 /* check file header */
815 if (p->buf_size <= 32)
817 if ((p->buf[0] == '.' && p->buf[1] == 'R' &&
818 p->buf[2] == 'M' && p->buf[3] == 'F' &&
819 p->buf[4] == 0 && p->buf[5] == 0) ||
820 (p->buf[0] == '.' && p->buf[1] == 'r' &&
821 p->buf[2] == 'a' && p->buf[3] == 0xfd))
822 return AVPROBE_SCORE_MAX;
827 static AVInputFormat rm_iformat = {
837 static AVOutputFormat rm_oformat = {
840 "application/vnd.rn-realmedia",
852 av_register_input_format(&rm_iformat);
853 av_register_output_format(&rm_oformat);