2 * "Real" compatible muxer.
3 * Copyright (c) 2000, 2001 Fabrice Bellard
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
44 #define BUFFER_DURATION 0
47 static void put_str(AVIOContext *s, const char *tag)
49 put_be16(s,strlen(tag));
55 static void put_str8(AVIOContext *s, const char *tag)
57 put_byte(s, strlen(tag));
63 static int rv10_write_header(AVFormatContext *ctx,
64 int data_size, int index_pos)
66 RMMuxContext *rm = ctx->priv_data;
67 AVIOContext *s = ctx->pb;
69 unsigned char *data_offset_ptr, *start_ptr;
70 const char *desc, *mimetype;
71 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
72 int bit_rate, v, duration, flags, data_pos;
75 start_ptr = s->buf_ptr;
78 put_be32(s,18); /* header size */
81 put_be32(s,4 + ctx->nb_streams); /* num headers */
87 packet_total_size = 0;
91 for(i=0;i<ctx->nb_streams;i++) {
92 StreamInfo *stream = &rm->streams[i];
93 bit_rate += stream->bit_rate;
94 if (stream->packet_max_size > packet_max_size)
95 packet_max_size = stream->packet_max_size;
96 nb_packets += stream->nb_packets;
97 packet_total_size += stream->packet_total_size;
98 /* select maximum duration */
99 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
103 put_be32(s, bit_rate); /* max bit rate */
104 put_be32(s, bit_rate); /* avg bit rate */
105 put_be32(s, packet_max_size); /* max packet size */
107 packet_avg_size = packet_total_size / nb_packets;
110 put_be32(s, packet_avg_size); /* avg packet size */
111 put_be32(s, nb_packets); /* num packets */
112 put_be32(s, duration); /* duration */
113 put_be32(s, BUFFER_DURATION); /* preroll */
114 put_be32(s, index_pos); /* index offset */
115 /* computation of data the data offset */
116 data_offset_ptr = s->buf_ptr;
117 put_be32(s, 0); /* data offset : will be patched after */
118 put_be16(s, ctx->nb_streams); /* num streams */
119 flags = 1 | 2; /* save allowed & perfect play */
120 if (url_is_streamed(s))
121 flags |= 4; /* live broadcast */
128 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
129 tag = av_metadata_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
130 if(tag) size += strlen(tag->value);
134 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
135 tag = av_metadata_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
136 put_str(s, tag ? tag->value : "");
139 for(i=0;i<ctx->nb_streams;i++) {
142 stream = &rm->streams[i];
144 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
145 desc = "The Audio Stream";
146 mimetype = "audio/x-pn-realaudio";
147 codec_data_size = 73;
149 desc = "The Video Stream";
150 mimetype = "video/x-pn-realvideo";
151 codec_data_size = 34;
155 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
159 put_be16(s, i); /* stream number */
160 put_be32(s, stream->bit_rate); /* max bit rate */
161 put_be32(s, stream->bit_rate); /* avg bit rate */
162 put_be32(s, stream->packet_max_size); /* max packet size */
163 if (stream->nb_packets > 0)
164 packet_avg_size = stream->packet_total_size /
168 put_be32(s, packet_avg_size); /* avg packet size */
169 put_be32(s, 0); /* start time */
170 put_be32(s, BUFFER_DURATION); /* preroll */
172 if (url_is_streamed(s) || !stream->total_frames)
173 put_be32(s, (int)(3600 * 1000));
175 put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
177 put_str8(s, mimetype);
178 put_be32(s, codec_data_size);
180 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
181 int coded_frame_size, fscode, sample_rate;
182 sample_rate = stream->enc->sample_rate;
183 coded_frame_size = (stream->enc->bit_rate *
184 stream->enc->frame_size) / (8 * sample_rate);
185 /* audio codec info */
188 put_be32(s, 0x00040000); /* version */
190 put_be32(s, 0x01b53530); /* stream length */
191 put_be16(s, 4); /* unknown */
192 put_be32(s, 0x39); /* header size */
194 switch(sample_rate) {
211 put_be16(s, fscode); /* codec additional info, for AC-3, seems
212 to be a frequency code */
213 /* special hack to compensate rounding errors... */
214 if (coded_frame_size == 557)
216 put_be32(s, coded_frame_size); /* frame length */
217 put_be32(s, 0x51540); /* unknown */
218 put_be32(s, 0x249f0); /* unknown */
219 put_be32(s, 0x249f0); /* unknown */
221 /* frame length : seems to be very important */
222 put_be16(s, coded_frame_size);
223 put_be32(s, 0); /* unknown */
224 put_be16(s, stream->enc->sample_rate); /* sample rate */
225 put_be32(s, 0x10); /* unknown */
226 put_be16(s, stream->enc->channels);
227 put_str8(s, "Int0"); /* codec name */
228 if (stream->enc->codec_tag) {
229 put_byte(s, 4); /* tag length */
230 put_le32(s, stream->enc->codec_tag);
232 av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n");
235 put_be16(s, 0); /* title length */
236 put_be16(s, 0); /* author length */
237 put_be16(s, 0); /* copyright length */
238 put_byte(s, 0); /* end of header */
240 /* video codec info */
241 put_be32(s,34); /* size */
242 if(stream->enc->codec_id == CODEC_ID_RV10)
243 put_tag(s,"VIDORV10");
245 put_tag(s,"VIDORV20");
246 put_be16(s, stream->enc->width);
247 put_be16(s, stream->enc->height);
248 put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */
249 put_be32(s,0); /* unknown meaning */
250 put_be16(s, (int) stream->frame_rate); /* unknown meaning */
251 put_be32(s,0); /* unknown meaning */
252 put_be16(s, 8); /* unknown meaning */
253 /* Seems to be the codec version: only use basic H263. The next
254 versions seems to add a diffential DC coding as in
255 MPEG... nothing new under the sun */
256 if(stream->enc->codec_id == CODEC_ID_RV10)
257 put_be32(s,0x10000000);
259 put_be32(s,0x20103001);
260 //put_be32(s,0x10003000);
264 /* patch data offset field */
265 data_pos = s->buf_ptr - start_ptr;
266 rm->data_pos = data_pos;
267 data_offset_ptr[0] = data_pos >> 24;
268 data_offset_ptr[1] = data_pos >> 16;
269 data_offset_ptr[2] = data_pos >> 8;
270 data_offset_ptr[3] = data_pos;
274 put_be32(s,data_size + 10 + 8);
277 put_be32(s, nb_packets); /* number of packets */
278 put_be32(s,0); /* next data header */
282 static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
283 int length, int key_frame)
286 AVIOContext *s = ctx->pb;
288 stream->nb_packets++;
289 stream->packet_total_size += length;
290 if (length > stream->packet_max_size)
291 stream->packet_max_size = length;
293 put_be16(s,0); /* version */
294 put_be16(s,length + 12);
295 put_be16(s, stream->num); /* stream number */
296 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
297 put_be32(s, timestamp); /* timestamp */
298 put_byte(s, 0); /* reserved */
299 put_byte(s, key_frame ? 2 : 0); /* flags */
302 static int rm_write_header(AVFormatContext *s)
304 RMMuxContext *rm = s->priv_data;
307 AVCodecContext *codec;
309 for(n=0;n<s->nb_streams;n++) {
310 s->streams[n]->id = n;
311 codec = s->streams[n]->codec;
312 stream = &rm->streams[n];
313 memset(stream, 0, sizeof(StreamInfo));
315 stream->bit_rate = codec->bit_rate;
318 switch(codec->codec_type) {
319 case AVMEDIA_TYPE_AUDIO:
320 rm->audio_stream = stream;
321 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
322 /* XXX: dummy values */
323 stream->packet_max_size = 1024;
324 stream->nb_packets = 0;
325 stream->total_frames = stream->nb_packets;
327 case AVMEDIA_TYPE_VIDEO:
328 rm->video_stream = stream;
329 stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
330 /* XXX: dummy values */
331 stream->packet_max_size = 4096;
332 stream->nb_packets = 0;
333 stream->total_frames = stream->nb_packets;
340 if (rv10_write_header(s, 0, 0))
341 return AVERROR_INVALIDDATA;
342 put_flush_packet(s->pb);
346 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
349 RMMuxContext *rm = s->priv_data;
350 AVIOContext *pb = s->pb;
351 StreamInfo *stream = rm->audio_stream;
354 /* XXX: suppress this malloc */
355 buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );
357 write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
359 if (stream->enc->codec_id == CODEC_ID_AC3) {
360 /* for AC-3, the words seem to be reversed */
361 for(i=0;i<size;i+=2) {
365 put_buffer(pb, buf1, size);
367 put_buffer(pb, buf, size);
369 put_flush_packet(pb);
375 static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
377 RMMuxContext *rm = s->priv_data;
378 AVIOContext *pb = s->pb;
379 StreamInfo *stream = rm->video_stream;
380 int key_frame = !!(flags & AV_PKT_FLAG_KEY);
382 /* XXX: this is incorrect: should be a parameter */
384 /* Well, I spent some time finding the meaning of these bits. I am
385 not sure I understood everything, but it works !! */
387 write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame);
388 /* bit 7: '1' if final packet of a frame converted in several packets */
390 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
391 frame starting from 1 */
398 put_be32(pb, size); /* total frame size */
399 put_be32(pb, size); /* offset from the start or the end */
401 put_be16(pb, 0x4000 | size); /* total frame size */
402 put_be16(pb, 0x4000 | size); /* offset from the start or the end */
406 write_packet_header(s, size + 6);
408 put_be16(pb, 0x4000 + size); /* total frame size */
409 put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
411 put_byte(pb, stream->nb_frames & 0xff);
413 put_buffer(pb, buf, size);
414 put_flush_packet(pb);
420 static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
422 if (s->streams[pkt->stream_index]->codec->codec_type ==
424 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
426 return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
429 static int rm_write_trailer(AVFormatContext *s)
431 RMMuxContext *rm = s->priv_data;
432 int data_size, index_pos, i;
433 AVIOContext *pb = s->pb;
435 if (!url_is_streamed(s->pb)) {
436 /* end of file: finish to write header */
437 index_pos = url_fseek(pb, 0, SEEK_CUR);
438 data_size = index_pos - rm->data_pos;
440 /* FIXME: write index */
442 /* undocumented end header */
446 url_fseek(pb, 0, SEEK_SET);
447 for(i=0;i<s->nb_streams;i++)
448 rm->streams[i].total_frames = rm->streams[i].nb_frames;
449 rv10_write_header(s, data_size, 0);
451 /* undocumented end header */
455 put_flush_packet(pb);
460 AVOutputFormat ff_rm_muxer = {
462 NULL_IF_CONFIG_SMALL("RealMedia format"),
463 "application/vnd.rn-realmedia",
465 sizeof(RMMuxContext),
471 .codec_tag= (const AVCodecTag* const []){ff_rm_codec_tags, 0},