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
22 #include "avio_internal.h"
27 int packet_total_size;
29 /* codec related output */
32 int nb_frames; /* current frame number */
33 int total_frames; /* total number of frames */
39 StreamInfo streams[2];
40 StreamInfo *audio_stream, *video_stream;
41 int data_pos; /* position of the data after the header */
45 #define BUFFER_DURATION 0
48 static void put_str(AVIOContext *s, const char *tag)
50 avio_wb16(s,strlen(tag));
56 static void put_str8(AVIOContext *s, const char *tag)
58 avio_w8(s, strlen(tag));
64 static int rv10_write_header(AVFormatContext *ctx,
65 int data_size, int index_pos)
67 RMMuxContext *rm = ctx->priv_data;
68 AVIOContext *s = ctx->pb;
70 unsigned char *data_offset_ptr, *start_ptr;
71 const char *desc, *mimetype;
72 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
73 int bit_rate, v, duration, flags, data_pos;
76 start_ptr = s->buf_ptr;
78 ffio_wfourcc(s, ".RMF");
79 avio_wb32(s,18); /* header size */
82 avio_wb32(s,4 + ctx->nb_streams); /* num headers */
84 ffio_wfourcc(s,"PROP");
88 packet_total_size = 0;
92 for(i=0;i<ctx->nb_streams;i++) {
93 StreamInfo *stream = &rm->streams[i];
94 bit_rate += stream->bit_rate;
95 if (stream->packet_max_size > packet_max_size)
96 packet_max_size = stream->packet_max_size;
97 nb_packets += stream->nb_packets;
98 packet_total_size += stream->packet_total_size;
99 /* select maximum duration */
100 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
104 avio_wb32(s, bit_rate); /* max bit rate */
105 avio_wb32(s, bit_rate); /* avg bit rate */
106 avio_wb32(s, packet_max_size); /* max packet size */
108 packet_avg_size = packet_total_size / nb_packets;
111 avio_wb32(s, packet_avg_size); /* avg packet size */
112 avio_wb32(s, nb_packets); /* num packets */
113 avio_wb32(s, duration); /* duration */
114 avio_wb32(s, BUFFER_DURATION); /* preroll */
115 avio_wb32(s, index_pos); /* index offset */
116 /* computation of data the data offset */
117 data_offset_ptr = s->buf_ptr;
118 avio_wb32(s, 0); /* data offset : will be patched after */
119 avio_wb16(s, ctx->nb_streams); /* num streams */
120 flags = 1 | 2; /* save allowed & perfect play */
121 if (url_is_streamed(s))
122 flags |= 4; /* live broadcast */
127 ffio_wfourcc(s,"CONT");
129 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
130 tag = av_metadata_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
131 if(tag) size += strlen(tag->value);
135 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
136 tag = av_metadata_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
137 put_str(s, tag ? tag->value : "");
140 for(i=0;i<ctx->nb_streams;i++) {
143 stream = &rm->streams[i];
145 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
146 desc = "The Audio Stream";
147 mimetype = "audio/x-pn-realaudio";
148 codec_data_size = 73;
150 desc = "The Video Stream";
151 mimetype = "video/x-pn-realvideo";
152 codec_data_size = 34;
155 ffio_wfourcc(s,"MDPR");
156 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
160 avio_wb16(s, i); /* stream number */
161 avio_wb32(s, stream->bit_rate); /* max bit rate */
162 avio_wb32(s, stream->bit_rate); /* avg bit rate */
163 avio_wb32(s, stream->packet_max_size); /* max packet size */
164 if (stream->nb_packets > 0)
165 packet_avg_size = stream->packet_total_size /
169 avio_wb32(s, packet_avg_size); /* avg packet size */
170 avio_wb32(s, 0); /* start time */
171 avio_wb32(s, BUFFER_DURATION); /* preroll */
173 if (url_is_streamed(s) || !stream->total_frames)
174 avio_wb32(s, (int)(3600 * 1000));
176 avio_wb32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
178 put_str8(s, mimetype);
179 avio_wb32(s, codec_data_size);
181 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
182 int coded_frame_size, fscode, sample_rate;
183 sample_rate = stream->enc->sample_rate;
184 coded_frame_size = (stream->enc->bit_rate *
185 stream->enc->frame_size) / (8 * sample_rate);
186 /* audio codec info */
187 avio_write(s, ".ra", 3);
189 avio_wb32(s, 0x00040000); /* version */
190 ffio_wfourcc(s, ".ra4");
191 avio_wb32(s, 0x01b53530); /* stream length */
192 avio_wb16(s, 4); /* unknown */
193 avio_wb32(s, 0x39); /* header size */
195 switch(sample_rate) {
212 avio_wb16(s, fscode); /* codec additional info, for AC-3, seems
213 to be a frequency code */
214 /* special hack to compensate rounding errors... */
215 if (coded_frame_size == 557)
217 avio_wb32(s, coded_frame_size); /* frame length */
218 avio_wb32(s, 0x51540); /* unknown */
219 avio_wb32(s, 0x249f0); /* unknown */
220 avio_wb32(s, 0x249f0); /* unknown */
222 /* frame length : seems to be very important */
223 avio_wb16(s, coded_frame_size);
224 avio_wb32(s, 0); /* unknown */
225 avio_wb16(s, stream->enc->sample_rate); /* sample rate */
226 avio_wb32(s, 0x10); /* unknown */
227 avio_wb16(s, stream->enc->channels);
228 put_str8(s, "Int0"); /* codec name */
229 if (stream->enc->codec_tag) {
230 avio_w8(s, 4); /* tag length */
231 avio_wl32(s, stream->enc->codec_tag);
233 av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n");
236 avio_wb16(s, 0); /* title length */
237 avio_wb16(s, 0); /* author length */
238 avio_wb16(s, 0); /* copyright length */
239 avio_w8(s, 0); /* end of header */
241 /* video codec info */
242 avio_wb32(s,34); /* size */
243 ffio_wfourcc(s, "VIDO");
244 if(stream->enc->codec_id == CODEC_ID_RV10)
245 ffio_wfourcc(s,"RV10");
247 ffio_wfourcc(s,"RV20");
248 avio_wb16(s, stream->enc->width);
249 avio_wb16(s, stream->enc->height);
250 avio_wb16(s, (int) stream->frame_rate); /* frames per seconds ? */
251 avio_wb32(s,0); /* unknown meaning */
252 avio_wb16(s, (int) stream->frame_rate); /* unknown meaning */
253 avio_wb32(s,0); /* unknown meaning */
254 avio_wb16(s, 8); /* unknown meaning */
255 /* Seems to be the codec version: only use basic H263. The next
256 versions seems to add a diffential DC coding as in
257 MPEG... nothing new under the sun */
258 if(stream->enc->codec_id == CODEC_ID_RV10)
259 avio_wb32(s,0x10000000);
261 avio_wb32(s,0x20103001);
262 //avio_wb32(s,0x10003000);
266 /* patch data offset field */
267 data_pos = s->buf_ptr - start_ptr;
268 rm->data_pos = data_pos;
269 data_offset_ptr[0] = data_pos >> 24;
270 data_offset_ptr[1] = data_pos >> 16;
271 data_offset_ptr[2] = data_pos >> 8;
272 data_offset_ptr[3] = data_pos;
275 ffio_wfourcc(s, "DATA");
276 avio_wb32(s,data_size + 10 + 8);
279 avio_wb32(s, nb_packets); /* number of packets */
280 avio_wb32(s,0); /* next data header */
284 static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
285 int length, int key_frame)
288 AVIOContext *s = ctx->pb;
290 stream->nb_packets++;
291 stream->packet_total_size += length;
292 if (length > stream->packet_max_size)
293 stream->packet_max_size = length;
295 avio_wb16(s,0); /* version */
296 avio_wb16(s,length + 12);
297 avio_wb16(s, stream->num); /* stream number */
298 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
299 avio_wb32(s, timestamp); /* timestamp */
300 avio_w8(s, 0); /* reserved */
301 avio_w8(s, key_frame ? 2 : 0); /* flags */
304 static int rm_write_header(AVFormatContext *s)
306 RMMuxContext *rm = s->priv_data;
309 AVCodecContext *codec;
311 for(n=0;n<s->nb_streams;n++) {
312 s->streams[n]->id = n;
313 codec = s->streams[n]->codec;
314 stream = &rm->streams[n];
315 memset(stream, 0, sizeof(StreamInfo));
317 stream->bit_rate = codec->bit_rate;
320 switch(codec->codec_type) {
321 case AVMEDIA_TYPE_AUDIO:
322 rm->audio_stream = stream;
323 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
324 /* XXX: dummy values */
325 stream->packet_max_size = 1024;
326 stream->nb_packets = 0;
327 stream->total_frames = stream->nb_packets;
329 case AVMEDIA_TYPE_VIDEO:
330 rm->video_stream = stream;
331 stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
332 /* XXX: dummy values */
333 stream->packet_max_size = 4096;
334 stream->nb_packets = 0;
335 stream->total_frames = stream->nb_packets;
342 if (rv10_write_header(s, 0, 0))
343 return AVERROR_INVALIDDATA;
348 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
351 RMMuxContext *rm = s->priv_data;
352 AVIOContext *pb = s->pb;
353 StreamInfo *stream = rm->audio_stream;
356 /* XXX: suppress this malloc */
357 buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );
359 write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
361 if (stream->enc->codec_id == CODEC_ID_AC3) {
362 /* for AC-3, the words seem to be reversed */
363 for(i=0;i<size;i+=2) {
367 avio_write(pb, buf1, size);
369 avio_write(pb, buf, size);
377 static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
379 RMMuxContext *rm = s->priv_data;
380 AVIOContext *pb = s->pb;
381 StreamInfo *stream = rm->video_stream;
382 int key_frame = !!(flags & AV_PKT_FLAG_KEY);
384 /* XXX: this is incorrect: should be a parameter */
386 /* Well, I spent some time finding the meaning of these bits. I am
387 not sure I understood everything, but it works !! */
389 write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame);
390 /* bit 7: '1' if final packet of a frame converted in several packets */
392 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
393 frame starting from 1 */
400 avio_wb32(pb, size); /* total frame size */
401 avio_wb32(pb, size); /* offset from the start or the end */
403 avio_wb16(pb, 0x4000 | size); /* total frame size */
404 avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */
408 write_packet_header(s, size + 6);
410 avio_wb16(pb, 0x4000 + size); /* total frame size */
411 avio_wb16(pb, 0x4000 + packet_number * 126); /* position in stream */
413 avio_w8(pb, stream->nb_frames & 0xff);
415 avio_write(pb, buf, size);
422 static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
424 if (s->streams[pkt->stream_index]->codec->codec_type ==
426 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
428 return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
431 static int rm_write_trailer(AVFormatContext *s)
433 RMMuxContext *rm = s->priv_data;
434 int data_size, index_pos, i;
435 AVIOContext *pb = s->pb;
437 if (!url_is_streamed(s->pb)) {
438 /* end of file: finish to write header */
439 index_pos = avio_seek(pb, 0, SEEK_CUR);
440 data_size = index_pos - rm->data_pos;
442 /* FIXME: write index */
444 /* undocumented end header */
448 avio_seek(pb, 0, SEEK_SET);
449 for(i=0;i<s->nb_streams;i++)
450 rm->streams[i].total_frames = rm->streams[i].nb_frames;
451 rv10_write_header(s, data_size, 0);
453 /* undocumented end header */
462 AVOutputFormat ff_rm_muxer = {
464 NULL_IF_CONFIG_SMALL("RealMedia format"),
465 "application/vnd.rn-realmedia",
467 sizeof(RMMuxContext),
473 .codec_tag= (const AVCodecTag* const []){ff_rm_codec_tags, 0},