cosmetics: indentation
[libav.git] / libavformat / rmenc.c
CommitLineData
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1/*
2 * "Real" compatible muxer.
3 * Copyright (c) 2000, 2001 Fabrice Bellard.
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21#include "avformat.h"
22#include "rm.h"
23
24/* in ms */
25#define BUFFER_DURATION 0
26
27
28static void put_str(ByteIOContext *s, const char *tag)
29{
30 put_be16(s,strlen(tag));
31 while (*tag) {
32 put_byte(s, *tag++);
33 }
34}
35
36static void put_str8(ByteIOContext *s, const char *tag)
37{
38 put_byte(s, strlen(tag));
39 while (*tag) {
40 put_byte(s, *tag++);
41 }
42}
43
44static void rv10_write_header(AVFormatContext *ctx,
45 int data_size, int index_pos)
46{
47 RMContext *rm = ctx->priv_data;
48 ByteIOContext *s = &ctx->pb;
49 StreamInfo *stream;
50 unsigned char *data_offset_ptr, *start_ptr;
51 const char *desc, *mimetype;
52 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
53 int bit_rate, v, duration, flags, data_pos;
54
55 start_ptr = s->buf_ptr;
56
57 put_tag(s, ".RMF");
58 put_be32(s,18); /* header size */
59 put_be16(s,0);
60 put_be32(s,0);
61 put_be32(s,4 + ctx->nb_streams); /* num headers */
62
63 put_tag(s,"PROP");
64 put_be32(s, 50);
65 put_be16(s, 0);
66 packet_max_size = 0;
67 packet_total_size = 0;
68 nb_packets = 0;
69 bit_rate = 0;
70 duration = 0;
71 for(i=0;i<ctx->nb_streams;i++) {
72 StreamInfo *stream = &rm->streams[i];
73 bit_rate += stream->bit_rate;
74 if (stream->packet_max_size > packet_max_size)
75 packet_max_size = stream->packet_max_size;
76 nb_packets += stream->nb_packets;
77 packet_total_size += stream->packet_total_size;
78 /* select maximum duration */
79 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate);
80 if (v > duration)
81 duration = v;
82 }
83 put_be32(s, bit_rate); /* max bit rate */
84 put_be32(s, bit_rate); /* avg bit rate */
85 put_be32(s, packet_max_size); /* max packet size */
86 if (nb_packets > 0)
87 packet_avg_size = packet_total_size / nb_packets;
88 else
89 packet_avg_size = 0;
90 put_be32(s, packet_avg_size); /* avg packet size */
91 put_be32(s, nb_packets); /* num packets */
92 put_be32(s, duration); /* duration */
93 put_be32(s, BUFFER_DURATION); /* preroll */
94 put_be32(s, index_pos); /* index offset */
95 /* computation of data the data offset */
96 data_offset_ptr = s->buf_ptr;
97 put_be32(s, 0); /* data offset : will be patched after */
98 put_be16(s, ctx->nb_streams); /* num streams */
99 flags = 1 | 2; /* save allowed & perfect play */
100 if (url_is_streamed(s))
101 flags |= 4; /* live broadcast */
102 put_be16(s, flags);
103
104 /* comments */
105
106 put_tag(s,"CONT");
107 size = strlen(ctx->title) + strlen(ctx->author) + strlen(ctx->copyright) +
108 strlen(ctx->comment) + 4 * 2 + 10;
109 put_be32(s,size);
110 put_be16(s,0);
111 put_str(s, ctx->title);
112 put_str(s, ctx->author);
113 put_str(s, ctx->copyright);
114 put_str(s, ctx->comment);
115
116 for(i=0;i<ctx->nb_streams;i++) {
117 int codec_data_size;
118
119 stream = &rm->streams[i];
120
121 if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
122 desc = "The Audio Stream";
123 mimetype = "audio/x-pn-realaudio";
124 codec_data_size = 73;
125 } else {
126 desc = "The Video Stream";
127 mimetype = "video/x-pn-realvideo";
128 codec_data_size = 34;
129 }
130
131 put_tag(s,"MDPR");
132 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
133 put_be32(s, size);
134 put_be16(s, 0);
135
136 put_be16(s, i); /* stream number */
137 put_be32(s, stream->bit_rate); /* max bit rate */
138 put_be32(s, stream->bit_rate); /* avg bit rate */
139 put_be32(s, stream->packet_max_size); /* max packet size */
140 if (stream->nb_packets > 0)
141 packet_avg_size = stream->packet_total_size /
142 stream->nb_packets;
143 else
144 packet_avg_size = 0;
145 put_be32(s, packet_avg_size); /* avg packet size */
146 put_be32(s, 0); /* start time */
147 put_be32(s, BUFFER_DURATION); /* preroll */
148 /* duration */
149 if (url_is_streamed(s) || !stream->total_frames)
150 put_be32(s, (int)(3600 * 1000));
151 else
152 put_be32(s, (int)(stream->total_frames * 1000 / stream->frame_rate));
153 put_str8(s, desc);
154 put_str8(s, mimetype);
155 put_be32(s, codec_data_size);
156
157 if (stream->enc->codec_type == CODEC_TYPE_AUDIO) {
158 int coded_frame_size, fscode, sample_rate;
159 sample_rate = stream->enc->sample_rate;
160 coded_frame_size = (stream->enc->bit_rate *
161 stream->enc->frame_size) / (8 * sample_rate);
162 /* audio codec info */
163 put_tag(s, ".ra");
164 put_byte(s, 0xfd);
165 put_be32(s, 0x00040000); /* version */
166 put_tag(s, ".ra4");
167 put_be32(s, 0x01b53530); /* stream length */
168 put_be16(s, 4); /* unknown */
169 put_be32(s, 0x39); /* header size */
170
171 switch(sample_rate) {
172 case 48000:
173 case 24000:
174 case 12000:
175 fscode = 1;
176 break;
177 default:
178 case 44100:
179 case 22050:
180 case 11025:
181 fscode = 2;
182 break;
183 case 32000:
184 case 16000:
185 case 8000:
186 fscode = 3;
187 }
188 put_be16(s, fscode); /* codec additional info, for AC3, seems
189 to be a frequency code */
190 /* special hack to compensate rounding errors... */
191 if (coded_frame_size == 557)
192 coded_frame_size--;
193 put_be32(s, coded_frame_size); /* frame length */
194 put_be32(s, 0x51540); /* unknown */
195 put_be32(s, 0x249f0); /* unknown */
196 put_be32(s, 0x249f0); /* unknown */
197 put_be16(s, 0x01);
198 /* frame length : seems to be very important */
199 put_be16(s, coded_frame_size);
200 put_be32(s, 0); /* unknown */
201 put_be16(s, stream->enc->sample_rate); /* sample rate */
202 put_be32(s, 0x10); /* unknown */
203 put_be16(s, stream->enc->channels);
204 put_str8(s, "Int0"); /* codec name */
205 put_str8(s, "dnet"); /* codec name */
206 put_be16(s, 0); /* title length */
207 put_be16(s, 0); /* author length */
208 put_be16(s, 0); /* copyright length */
209 put_byte(s, 0); /* end of header */
210 } else {
211 /* video codec info */
212 put_be32(s,34); /* size */
213 if(stream->enc->codec_id == CODEC_ID_RV10)
214 put_tag(s,"VIDORV10");
215 else
216 put_tag(s,"VIDORV20");
217 put_be16(s, stream->enc->width);
218 put_be16(s, stream->enc->height);
219 put_be16(s, (int) stream->frame_rate); /* frames per seconds ? */
220 put_be32(s,0); /* unknown meaning */
221 put_be16(s, (int) stream->frame_rate); /* unknown meaning */
222 put_be32(s,0); /* unknown meaning */
223 put_be16(s, 8); /* unknown meaning */
224 /* Seems to be the codec version: only use basic H263. The next
225 versions seems to add a diffential DC coding as in
226 MPEG... nothing new under the sun */
227 if(stream->enc->codec_id == CODEC_ID_RV10)
228 put_be32(s,0x10000000);
229 else
230 put_be32(s,0x20103001);
231 //put_be32(s,0x10003000);
232 }
233 }
234
235 /* patch data offset field */
236 data_pos = s->buf_ptr - start_ptr;
237 rm->data_pos = data_pos;
238 data_offset_ptr[0] = data_pos >> 24;
239 data_offset_ptr[1] = data_pos >> 16;
240 data_offset_ptr[2] = data_pos >> 8;
241 data_offset_ptr[3] = data_pos;
242
243 /* data stream */
244 put_tag(s,"DATA");
245 put_be32(s,data_size + 10 + 8);
246 put_be16(s,0);
247
248 put_be32(s, nb_packets); /* number of packets */
249 put_be32(s,0); /* next data header */
250}
251
252static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
253 int length, int key_frame)
254{
255 int timestamp;
256 ByteIOContext *s = &ctx->pb;
257
258 stream->nb_packets++;
259 stream->packet_total_size += length;
260 if (length > stream->packet_max_size)
261 stream->packet_max_size = length;
262
263 put_be16(s,0); /* version */
264 put_be16(s,length + 12);
265 put_be16(s, stream->num); /* stream number */
266 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate;
267 put_be32(s, timestamp); /* timestamp */
268 put_byte(s, 0); /* reserved */
269 put_byte(s, key_frame ? 2 : 0); /* flags */
270}
271
272static int rm_write_header(AVFormatContext *s)
273{
274 RMContext *rm = s->priv_data;
275 StreamInfo *stream;
276 int n;
277 AVCodecContext *codec;
278
279 for(n=0;n<s->nb_streams;n++) {
280 s->streams[n]->id = n;
281 codec = s->streams[n]->codec;
282 stream = &rm->streams[n];
283 memset(stream, 0, sizeof(StreamInfo));
284 stream->num = n;
285 stream->bit_rate = codec->bit_rate;
286 stream->enc = codec;
287
288 switch(codec->codec_type) {
289 case CODEC_TYPE_AUDIO:
290 rm->audio_stream = stream;
291 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size;
292 /* XXX: dummy values */
293 stream->packet_max_size = 1024;
294 stream->nb_packets = 0;
295 stream->total_frames = stream->nb_packets;
296 break;
297 case CODEC_TYPE_VIDEO:
298 rm->video_stream = stream;
299 stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num;
300 /* XXX: dummy values */
301 stream->packet_max_size = 4096;
302 stream->nb_packets = 0;
303 stream->total_frames = stream->nb_packets;
304 break;
305 default:
306 return -1;
307 }
308 }
309
310 rv10_write_header(s, 0, 0);
311 put_flush_packet(&s->pb);
312 return 0;
313}
314
315static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
316{
317 uint8_t *buf1;
318 RMContext *rm = s->priv_data;
319 ByteIOContext *pb = &s->pb;
320 StreamInfo *stream = rm->audio_stream;
321 int i;
322
323 /* XXX: suppress this malloc */
324 buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) );
325
326 write_packet_header(s, stream, size, !!(flags & PKT_FLAG_KEY));
327
328 /* for AC3, the words seems to be reversed */
329 for(i=0;i<size;i+=2) {
330 buf1[i] = buf[i+1];
331 buf1[i+1] = buf[i];
332 }
333 put_buffer(pb, buf1, size);
334 put_flush_packet(pb);
335 stream->nb_frames++;
336 av_free(buf1);
337 return 0;
338}
339
340static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
341{
342 RMContext *rm = s->priv_data;
343 ByteIOContext *pb = &s->pb;
344 StreamInfo *stream = rm->video_stream;
345 int key_frame = !!(flags & PKT_FLAG_KEY);
346
347 /* XXX: this is incorrect: should be a parameter */
348
349 /* Well, I spent some time finding the meaning of these bits. I am
350 not sure I understood everything, but it works !! */
351#if 1
352 write_packet_header(s, stream, size + 7, key_frame);
353 /* bit 7: '1' if final packet of a frame converted in several packets */
354 put_byte(pb, 0x81);
355 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current
356 frame starting from 1 */
357 if (key_frame) {
358 put_byte(pb, 0x81);
359 } else {
360 put_byte(pb, 0x01);
361 }
362 put_be16(pb, 0x4000 + (size)); /* total frame size */
363 put_be16(pb, 0x4000 + (size)); /* offset from the start or the end */
364#else
365 /* full frame */
366 write_packet_header(s, size + 6);
367 put_byte(pb, 0xc0);
368 put_be16(pb, 0x4000 + size); /* total frame size */
369 put_be16(pb, 0x4000 + packet_number * 126); /* position in stream */
370#endif
371 put_byte(pb, stream->nb_frames & 0xff);
372
373 put_buffer(pb, buf, size);
374 put_flush_packet(pb);
375
376 stream->nb_frames++;
377 return 0;
378}
379
380static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
381{
382 if (s->streams[pkt->stream_index]->codec->codec_type ==
383 CODEC_TYPE_AUDIO)
384 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
385 else
386 return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
387}
388
389static int rm_write_trailer(AVFormatContext *s)
390{
391 RMContext *rm = s->priv_data;
392 int data_size, index_pos, i;
393 ByteIOContext *pb = &s->pb;
394
395 if (!url_is_streamed(&s->pb)) {
396 /* end of file: finish to write header */
397 index_pos = url_fseek(pb, 0, SEEK_CUR);
398 data_size = index_pos - rm->data_pos;
399
400 /* index */
401 put_tag(pb, "INDX");
402 put_be32(pb, 10 + 10 * s->nb_streams);
403 put_be16(pb, 0);
404
405 for(i=0;i<s->nb_streams;i++) {
406 put_be32(pb, 0); /* zero indices */
407 put_be16(pb, i); /* stream number */
408 put_be32(pb, 0); /* next index */
409 }
410 /* undocumented end header */
411 put_be32(pb, 0);
412 put_be32(pb, 0);
413
414 url_fseek(pb, 0, SEEK_SET);
415 for(i=0;i<s->nb_streams;i++)
416 rm->streams[i].total_frames = rm->streams[i].nb_frames;
417 rv10_write_header(s, data_size, index_pos);
418 } else {
419 /* undocumented end header */
420 put_be32(pb, 0);
421 put_be32(pb, 0);
422 }
423 put_flush_packet(pb);
424 return 0;
425}
426
427
428AVOutputFormat rm_muxer = {
429 "rm",
430 "rm format",
431 "application/vnd.rn-realmedia",
432 "rm,ra",
433 sizeof(RMContext),
434 CODEC_ID_AC3,
435 CODEC_ID_RV10,
436 rm_write_header,
437 rm_write_packet,
438 rm_write_trailer,
439};