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"
24 #include "libavutil/dict.h"
28 int packet_total_size;
30 /* codec related output */
33 int nb_frames; /* current frame number */
34 int total_frames; /* total number of frames */
40 StreamInfo streams[2];
41 StreamInfo *audio_stream, *video_stream;
42 int data_pos; /* position of the data after the header */
46 #define BUFFER_DURATION 0
49 static void put_str(AVIOContext *s, const char *tag)
51 avio_wb16(s,strlen(tag));
57 static void put_str8(AVIOContext *s, const char *tag)
59 avio_w8(s, strlen(tag));
65 static int rv10_write_header(AVFormatContext *ctx,
66 int data_size, int index_pos)
68 RMMuxContext *rm = ctx->priv_data;
69 AVIOContext *s = ctx->pb;
71 unsigned char *data_offset_ptr, *start_ptr;
72 const char *desc, *mimetype;
73 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
74 int bit_rate, v, duration, flags, data_pos;
75 AVDictionaryEntry *tag;
77 start_ptr = s->buf_ptr;
79 ffio_wfourcc(s, ".RMF");
80 avio_wb32(s,18); /* header size */
83 avio_wb32(s,4 + ctx->nb_streams); /* num headers */
85 ffio_wfourcc(s,"PROP");
89 packet_total_size = 0;
93 for(i=0;i<ctx->nb_streams;i++) {
94 StreamInfo *stream = &rm->streams[i];
95 bit_rate += stream->bit_rate;
96 if (stream->packet_max_size > packet_max_size)
97 packet_max_size = stream->packet_max_size;
98 nb_packets += stream->nb_packets;
99 packet_total_size += stream->packet_total_size;
100 /* select maximum duration */
101 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
105 avio_wb32(s, bit_rate); /* max bit rate */
106 avio_wb32(s, bit_rate); /* avg bit rate */
107 avio_wb32(s, packet_max_size); /* max packet size */
109 packet_avg_size = packet_total_size / nb_packets;
112 avio_wb32(s, packet_avg_size); /* avg packet size */
113 avio_wb32(s, nb_packets); /* num packets */
114 avio_wb32(s, duration); /* duration */
115 avio_wb32(s, BUFFER_DURATION); /* preroll */
116 avio_wb32(s, index_pos); /* index offset */
117 /* computation of data the data offset */
118 data_offset_ptr = s->buf_ptr;
119 avio_wb32(s, 0); /* data offset : will be patched after */
120 avio_wb16(s, ctx->nb_streams); /* num streams */
121 flags = 1 | 2; /* save allowed & perfect play */
123 flags |= 4; /* live broadcast */
128 ffio_wfourcc(s,"CONT");
130 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
131 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
132 if(tag) size += strlen(tag->value);
136 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
137 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
138 put_str(s, tag ? tag->value : "");
141 for(i=0;i<ctx->nb_streams;i++) {
144 stream = &rm->streams[i];
146 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
147 desc = "The Audio Stream";
148 mimetype = "audio/x-pn-realaudio";
149 codec_data_size = 73;
151 desc = "The Video Stream";
152 mimetype = "video/x-pn-realvideo";
153 codec_data_size = 34;
156 ffio_wfourcc(s,"MDPR");
157 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
161 avio_wb16(s, i); /* stream number */
162 avio_wb32(s, stream->bit_rate); /* max bit rate */
163 avio_wb32(s, stream->bit_rate); /* avg bit rate */
164 avio_wb32(s, stream->packet_max_size); /* max packet size */
165 if (stream->nb_packets > 0)
166 packet_avg_size = stream->packet_total_size /
170 avio_wb32(s, packet_avg_size); /* avg packet size */
171 avio_wb32(s, 0); /* start time */
172 avio_wb32(s, BUFFER_DURATION); /* preroll */
174 if (!s->seekable || !stream->total_frames)
175 avio_wb32(s, (int)(3600 * 1000));
177 avio_wb32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
179 put_str8(s, mimetype);
180 avio_wb32(s, codec_data_size);
182 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) {
183 int coded_frame_size, fscode, sample_rate;
184 sample_rate = stream->enc->sample_rate;
185 coded_frame_size = (stream->enc->bit_rate *
186 stream->enc->frame_size) / (8 * sample_rate);
187 /* audio codec info */
188 avio_write(s, ".ra", 3);
190 avio_wb32(s, 0x00040000); /* version */
191 ffio_wfourcc(s, ".ra4");
192 avio_wb32(s, 0x01b53530); /* stream length */
193 avio_wb16(s, 4); /* unknown */
194 avio_wb32(s, 0x39); /* header size */
196 switch(sample_rate) {
213 avio_wb16(s, fscode); /* codec additional info, for AC-3, seems
214 to be a frequency code */
215 /* special hack to compensate rounding errors... */
216 if (coded_frame_size == 557)
218 avio_wb32(s, coded_frame_size); /* frame length */
219 avio_wb32(s, 0x51540); /* unknown */
220 avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */
221 avio_wb32(s, stream->enc->bit_rate / 8 * 60); /* bytes per minute */
223 /* frame length : seems to be very important */
224 avio_wb16(s, coded_frame_size);
225 avio_wb32(s, 0); /* unknown */
226 avio_wb16(s, stream->enc->sample_rate); /* sample rate */
227 avio_wb32(s, 0x10); /* unknown */
228 avio_wb16(s, stream->enc->channels);
229 put_str8(s, "Int0"); /* codec name */
230 if (stream->enc->codec_tag) {
231 avio_w8(s, 4); /* tag length */
232 avio_wl32(s, stream->enc->codec_tag);
234 av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n");
237 avio_wb16(s, 0); /* title length */
238 avio_wb16(s, 0); /* author length */
239 avio_wb16(s, 0); /* copyright length */
240 avio_w8(s, 0); /* end of header */
242 /* video codec info */
243 avio_wb32(s,34); /* size */
244 ffio_wfourcc(s, "VIDO");
245 if(stream->enc->codec_id == AV_CODEC_ID_RV10)
246 ffio_wfourcc(s,"RV10");
248 ffio_wfourcc(s,"RV20");
249 avio_wb16(s, stream->enc->width);
250 avio_wb16(s, stream->enc->height);
251 avio_wb16(s, (int) stream->frame_rate); /* frames per seconds ? */
252 avio_wb32(s,0); /* unknown meaning */
253 avio_wb16(s, (int) stream->frame_rate); /* unknown meaning */
254 avio_wb32(s,0); /* unknown meaning */
255 avio_wb16(s, 8); /* unknown meaning */
256 /* Seems to be the codec version: only use basic H263. The next
257 versions seems to add a diffential DC coding as in
258 MPEG... nothing new under the sun */
259 if(stream->enc->codec_id == AV_CODEC_ID_RV10)
260 avio_wb32(s,0x10000000);
262 avio_wb32(s,0x20103001);
263 //avio_wb32(s,0x10003000);
267 /* patch data offset field */
268 data_pos = s->buf_ptr - start_ptr;
269 rm->data_pos = data_pos;
270 data_offset_ptr[0] = data_pos >> 24;
271 data_offset_ptr[1] = data_pos >> 16;
272 data_offset_ptr[2] = data_pos >> 8;
273 data_offset_ptr[3] = data_pos;
276 ffio_wfourcc(s, "DATA");
277 avio_wb32(s,data_size + 10 + 8);
280 avio_wb32(s, nb_packets); /* number of packets */
281 avio_wb32(s,0); /* next data header */
285 static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
286 int length, int key_frame)
289 AVIOContext *s = ctx->pb;
291 stream->nb_packets++;
292 stream->packet_total_size += length;
293 if (length > stream->packet_max_size)
294 stream->packet_max_size = length;
296 avio_wb16(s,0); /* version */
297 avio_wb16(s,length + 12);
298 avio_wb16(s, stream->num); /* stream number */
299 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
300 avio_wb32(s, timestamp); /* timestamp */
301 avio_w8(s, 0); /* reserved */
302 avio_w8(s, key_frame ? 2 : 0); /* flags */
305 static int rm_write_header(AVFormatContext *s)
307 RMMuxContext *rm = s->priv_data;
310 AVCodecContext *codec;
312 if (s->nb_streams > 2) {
313 av_log(s, AV_LOG_ERROR, "At most 2 streams are currently supported for muxing in RM\n");
314 return AVERROR_PATCHWELCOME;
317 for(n=0;n<s->nb_streams;n++) {
318 s->streams[n]->id = n;
319 codec = s->streams[n]->codec;
320 stream = &rm->streams[n];
321 memset(stream, 0, sizeof(StreamInfo));
323 stream->bit_rate = codec->bit_rate;
326 switch(codec->codec_type) {
327 case AVMEDIA_TYPE_AUDIO:
328 rm->audio_stream = stream;
329 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
330 /* XXX: dummy values */
331 stream->packet_max_size = 1024;
332 stream->nb_packets = 0;
333 stream->total_frames = stream->nb_packets;
335 case AVMEDIA_TYPE_VIDEO:
336 rm->video_stream = stream;
337 stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
338 /* XXX: dummy values */
339 stream->packet_max_size = 4096;
340 stream->nb_packets = 0;
341 stream->total_frames = stream->nb_packets;
348 if (rv10_write_header(s, 0, 0))
349 return AVERROR_INVALIDDATA;
354 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
357 RMMuxContext *rm = s->priv_data;
358 AVIOContext *pb = s->pb;
359 StreamInfo *stream = rm->audio_stream;
362 /* XXX: suppress this malloc */
363 buf1 = av_malloc(size * sizeof(uint8_t));
365 write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
367 if (stream->enc->codec_id == AV_CODEC_ID_AC3) {
368 /* for AC-3, the words seem to be reversed */
369 for(i=0;i<size;i+=2) {
373 avio_write(pb, buf1, size);
375 avio_write(pb, buf, size);
382 static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
384 RMMuxContext *rm = s->priv_data;
385 AVIOContext *pb = s->pb;
386 StreamInfo *stream = rm->video_stream;
387 int key_frame = !!(flags & AV_PKT_FLAG_KEY);
389 /* XXX: this is incorrect: should be a parameter */
391 /* Well, I spent some time finding the meaning of these bits. I am
392 not sure I understood everything, but it works !! */
394 write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame);
395 /* bit 7: '1' if final packet of a frame converted in several packets */
397 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
398 frame starting from 1 */
405 avio_wb32(pb, size); /* total frame size */
406 avio_wb32(pb, size); /* offset from the start or the end */
408 avio_wb16(pb, 0x4000 | size); /* total frame size */
409 avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */
413 write_packet_header(s, size + 6);
415 avio_wb16(pb, 0x4000 + size); /* total frame size */
416 avio_wb16(pb, 0x4000 + packet_number * 126); /* position in stream */
418 avio_w8(pb, stream->nb_frames & 0xff);
420 avio_write(pb, buf, size);
426 static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
428 if (s->streams[pkt->stream_index]->codec->codec_type ==
430 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
432 return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
435 static int rm_write_trailer(AVFormatContext *s)
437 RMMuxContext *rm = s->priv_data;
438 int data_size, index_pos, i;
439 AVIOContext *pb = s->pb;
441 if (s->pb->seekable) {
442 /* end of file: finish to write header */
443 index_pos = avio_tell(pb);
444 data_size = index_pos - rm->data_pos;
446 /* FIXME: write index */
448 /* undocumented end header */
452 avio_seek(pb, 0, SEEK_SET);
453 for(i=0;i<s->nb_streams;i++)
454 rm->streams[i].total_frames = rm->streams[i].nb_frames;
455 rv10_write_header(s, data_size, 0);
457 /* undocumented end header */
466 AVOutputFormat ff_rm_muxer = {
468 .long_name = NULL_IF_CONFIG_SMALL("RealMedia"),
469 .mime_type = "application/vnd.rn-realmedia",
470 .extensions = "rm,ra",
471 .priv_data_size = sizeof(RMMuxContext),
472 .audio_codec = AV_CODEC_ID_AC3,
473 .video_codec = AV_CODEC_ID_RV10,
474 .write_header = rm_write_header,
475 .write_packet = rm_write_packet,
476 .write_trailer = rm_write_trailer,
477 .codec_tag = (const AVCodecTag* const []){ ff_rm_codec_tags, 0 },