Libav 0.7.1
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00001 /* 00002 * "Real" compatible muxer. 00003 * Copyright (c) 2000, 2001 Fabrice Bellard 00004 * 00005 * This file is part of Libav. 00006 * 00007 * Libav is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * Libav is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with Libav; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 #include "avformat.h" 00022 #include "avio_internal.h" 00023 #include "rm.h" 00024 #include "libavutil/dict.h" 00025 00026 typedef struct { 00027 int nb_packets; 00028 int packet_total_size; 00029 int packet_max_size; 00030 /* codec related output */ 00031 int bit_rate; 00032 float frame_rate; 00033 int nb_frames; /* current frame number */ 00034 int total_frames; /* total number of frames */ 00035 int num; 00036 AVCodecContext *enc; 00037 } StreamInfo; 00038 00039 typedef struct { 00040 StreamInfo streams[2]; 00041 StreamInfo *audio_stream, *video_stream; 00042 int data_pos; /* position of the data after the header */ 00043 } RMMuxContext; 00044 00045 /* in ms */ 00046 #define BUFFER_DURATION 0 00047 00048 00049 static void put_str(AVIOContext *s, const char *tag) 00050 { 00051 avio_wb16(s,strlen(tag)); 00052 while (*tag) { 00053 avio_w8(s, *tag++); 00054 } 00055 } 00056 00057 static void put_str8(AVIOContext *s, const char *tag) 00058 { 00059 avio_w8(s, strlen(tag)); 00060 while (*tag) { 00061 avio_w8(s, *tag++); 00062 } 00063 } 00064 00065 static int rv10_write_header(AVFormatContext *ctx, 00066 int data_size, int index_pos) 00067 { 00068 RMMuxContext *rm = ctx->priv_data; 00069 AVIOContext *s = ctx->pb; 00070 StreamInfo *stream; 00071 unsigned char *data_offset_ptr, *start_ptr; 00072 const char *desc, *mimetype; 00073 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i; 00074 int bit_rate, v, duration, flags, data_pos; 00075 AVDictionaryEntry *tag; 00076 00077 start_ptr = s->buf_ptr; 00078 00079 ffio_wfourcc(s, ".RMF"); 00080 avio_wb32(s,18); /* header size */ 00081 avio_wb16(s,0); 00082 avio_wb32(s,0); 00083 avio_wb32(s,4 + ctx->nb_streams); /* num headers */ 00084 00085 ffio_wfourcc(s,"PROP"); 00086 avio_wb32(s, 50); 00087 avio_wb16(s, 0); 00088 packet_max_size = 0; 00089 packet_total_size = 0; 00090 nb_packets = 0; 00091 bit_rate = 0; 00092 duration = 0; 00093 for(i=0;i<ctx->nb_streams;i++) { 00094 StreamInfo *stream = &rm->streams[i]; 00095 bit_rate += stream->bit_rate; 00096 if (stream->packet_max_size > packet_max_size) 00097 packet_max_size = stream->packet_max_size; 00098 nb_packets += stream->nb_packets; 00099 packet_total_size += stream->packet_total_size; 00100 /* select maximum duration */ 00101 v = (int) (1000.0 * (float)stream->total_frames / stream->frame_rate); 00102 if (v > duration) 00103 duration = v; 00104 } 00105 avio_wb32(s, bit_rate); /* max bit rate */ 00106 avio_wb32(s, bit_rate); /* avg bit rate */ 00107 avio_wb32(s, packet_max_size); /* max packet size */ 00108 if (nb_packets > 0) 00109 packet_avg_size = packet_total_size / nb_packets; 00110 else 00111 packet_avg_size = 0; 00112 avio_wb32(s, packet_avg_size); /* avg packet size */ 00113 avio_wb32(s, nb_packets); /* num packets */ 00114 avio_wb32(s, duration); /* duration */ 00115 avio_wb32(s, BUFFER_DURATION); /* preroll */ 00116 avio_wb32(s, index_pos); /* index offset */ 00117 /* computation of data the data offset */ 00118 data_offset_ptr = s->buf_ptr; 00119 avio_wb32(s, 0); /* data offset : will be patched after */ 00120 avio_wb16(s, ctx->nb_streams); /* num streams */ 00121 flags = 1 | 2; /* save allowed & perfect play */ 00122 if (!s->seekable) 00123 flags |= 4; /* live broadcast */ 00124 avio_wb16(s, flags); 00125 00126 /* comments */ 00127 00128 ffio_wfourcc(s,"CONT"); 00129 size = 4 * 2 + 10; 00130 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { 00131 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); 00132 if(tag) size += strlen(tag->value); 00133 } 00134 avio_wb32(s,size); 00135 avio_wb16(s,0); 00136 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) { 00137 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0); 00138 put_str(s, tag ? tag->value : ""); 00139 } 00140 00141 for(i=0;i<ctx->nb_streams;i++) { 00142 int codec_data_size; 00143 00144 stream = &rm->streams[i]; 00145 00146 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) { 00147 desc = "The Audio Stream"; 00148 mimetype = "audio/x-pn-realaudio"; 00149 codec_data_size = 73; 00150 } else { 00151 desc = "The Video Stream"; 00152 mimetype = "video/x-pn-realvideo"; 00153 codec_data_size = 34; 00154 } 00155 00156 ffio_wfourcc(s,"MDPR"); 00157 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size; 00158 avio_wb32(s, size); 00159 avio_wb16(s, 0); 00160 00161 avio_wb16(s, i); /* stream number */ 00162 avio_wb32(s, stream->bit_rate); /* max bit rate */ 00163 avio_wb32(s, stream->bit_rate); /* avg bit rate */ 00164 avio_wb32(s, stream->packet_max_size); /* max packet size */ 00165 if (stream->nb_packets > 0) 00166 packet_avg_size = stream->packet_total_size / 00167 stream->nb_packets; 00168 else 00169 packet_avg_size = 0; 00170 avio_wb32(s, packet_avg_size); /* avg packet size */ 00171 avio_wb32(s, 0); /* start time */ 00172 avio_wb32(s, BUFFER_DURATION); /* preroll */ 00173 /* duration */ 00174 if (!s->seekable || !stream->total_frames) 00175 avio_wb32(s, (int)(3600 * 1000)); 00176 else 00177 avio_wb32(s, (int)(stream->total_frames * 1000 / stream->frame_rate)); 00178 put_str8(s, desc); 00179 put_str8(s, mimetype); 00180 avio_wb32(s, codec_data_size); 00181 00182 if (stream->enc->codec_type == AVMEDIA_TYPE_AUDIO) { 00183 int coded_frame_size, fscode, sample_rate; 00184 sample_rate = stream->enc->sample_rate; 00185 coded_frame_size = (stream->enc->bit_rate * 00186 stream->enc->frame_size) / (8 * sample_rate); 00187 /* audio codec info */ 00188 avio_write(s, ".ra", 3); 00189 avio_w8(s, 0xfd); 00190 avio_wb32(s, 0x00040000); /* version */ 00191 ffio_wfourcc(s, ".ra4"); 00192 avio_wb32(s, 0x01b53530); /* stream length */ 00193 avio_wb16(s, 4); /* unknown */ 00194 avio_wb32(s, 0x39); /* header size */ 00195 00196 switch(sample_rate) { 00197 case 48000: 00198 case 24000: 00199 case 12000: 00200 fscode = 1; 00201 break; 00202 default: 00203 case 44100: 00204 case 22050: 00205 case 11025: 00206 fscode = 2; 00207 break; 00208 case 32000: 00209 case 16000: 00210 case 8000: 00211 fscode = 3; 00212 } 00213 avio_wb16(s, fscode); /* codec additional info, for AC-3, seems 00214 to be a frequency code */ 00215 /* special hack to compensate rounding errors... */ 00216 if (coded_frame_size == 557) 00217 coded_frame_size--; 00218 avio_wb32(s, coded_frame_size); /* frame length */ 00219 avio_wb32(s, 0x51540); /* unknown */ 00220 avio_wb32(s, 0x249f0); /* unknown */ 00221 avio_wb32(s, 0x249f0); /* unknown */ 00222 avio_wb16(s, 0x01); 00223 /* frame length : seems to be very important */ 00224 avio_wb16(s, coded_frame_size); 00225 avio_wb32(s, 0); /* unknown */ 00226 avio_wb16(s, stream->enc->sample_rate); /* sample rate */ 00227 avio_wb32(s, 0x10); /* unknown */ 00228 avio_wb16(s, stream->enc->channels); 00229 put_str8(s, "Int0"); /* codec name */ 00230 if (stream->enc->codec_tag) { 00231 avio_w8(s, 4); /* tag length */ 00232 avio_wl32(s, stream->enc->codec_tag); 00233 } else { 00234 av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n"); 00235 return -1; 00236 } 00237 avio_wb16(s, 0); /* title length */ 00238 avio_wb16(s, 0); /* author length */ 00239 avio_wb16(s, 0); /* copyright length */ 00240 avio_w8(s, 0); /* end of header */ 00241 } else { 00242 /* video codec info */ 00243 avio_wb32(s,34); /* size */ 00244 ffio_wfourcc(s, "VIDO"); 00245 if(stream->enc->codec_id == CODEC_ID_RV10) 00246 ffio_wfourcc(s,"RV10"); 00247 else 00248 ffio_wfourcc(s,"RV20"); 00249 avio_wb16(s, stream->enc->width); 00250 avio_wb16(s, stream->enc->height); 00251 avio_wb16(s, (int) stream->frame_rate); /* frames per seconds ? */ 00252 avio_wb32(s,0); /* unknown meaning */ 00253 avio_wb16(s, (int) stream->frame_rate); /* unknown meaning */ 00254 avio_wb32(s,0); /* unknown meaning */ 00255 avio_wb16(s, 8); /* unknown meaning */ 00256 /* Seems to be the codec version: only use basic H263. The next 00257 versions seems to add a diffential DC coding as in 00258 MPEG... nothing new under the sun */ 00259 if(stream->enc->codec_id == CODEC_ID_RV10) 00260 avio_wb32(s,0x10000000); 00261 else 00262 avio_wb32(s,0x20103001); 00263 //avio_wb32(s,0x10003000); 00264 } 00265 } 00266 00267 /* patch data offset field */ 00268 data_pos = s->buf_ptr - start_ptr; 00269 rm->data_pos = data_pos; 00270 data_offset_ptr[0] = data_pos >> 24; 00271 data_offset_ptr[1] = data_pos >> 16; 00272 data_offset_ptr[2] = data_pos >> 8; 00273 data_offset_ptr[3] = data_pos; 00274 00275 /* data stream */ 00276 ffio_wfourcc(s, "DATA"); 00277 avio_wb32(s,data_size + 10 + 8); 00278 avio_wb16(s,0); 00279 00280 avio_wb32(s, nb_packets); /* number of packets */ 00281 avio_wb32(s,0); /* next data header */ 00282 return 0; 00283 } 00284 00285 static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream, 00286 int length, int key_frame) 00287 { 00288 int timestamp; 00289 AVIOContext *s = ctx->pb; 00290 00291 stream->nb_packets++; 00292 stream->packet_total_size += length; 00293 if (length > stream->packet_max_size) 00294 stream->packet_max_size = length; 00295 00296 avio_wb16(s,0); /* version */ 00297 avio_wb16(s,length + 12); 00298 avio_wb16(s, stream->num); /* stream number */ 00299 timestamp = (1000 * (float)stream->nb_frames) / stream->frame_rate; 00300 avio_wb32(s, timestamp); /* timestamp */ 00301 avio_w8(s, 0); /* reserved */ 00302 avio_w8(s, key_frame ? 2 : 0); /* flags */ 00303 } 00304 00305 static int rm_write_header(AVFormatContext *s) 00306 { 00307 RMMuxContext *rm = s->priv_data; 00308 StreamInfo *stream; 00309 int n; 00310 AVCodecContext *codec; 00311 00312 for(n=0;n<s->nb_streams;n++) { 00313 s->streams[n]->id = n; 00314 codec = s->streams[n]->codec; 00315 stream = &rm->streams[n]; 00316 memset(stream, 0, sizeof(StreamInfo)); 00317 stream->num = n; 00318 stream->bit_rate = codec->bit_rate; 00319 stream->enc = codec; 00320 00321 switch(codec->codec_type) { 00322 case AVMEDIA_TYPE_AUDIO: 00323 rm->audio_stream = stream; 00324 stream->frame_rate = (float)codec->sample_rate / (float)codec->frame_size; 00325 /* XXX: dummy values */ 00326 stream->packet_max_size = 1024; 00327 stream->nb_packets = 0; 00328 stream->total_frames = stream->nb_packets; 00329 break; 00330 case AVMEDIA_TYPE_VIDEO: 00331 rm->video_stream = stream; 00332 stream->frame_rate = (float)codec->time_base.den / (float)codec->time_base.num; 00333 /* XXX: dummy values */ 00334 stream->packet_max_size = 4096; 00335 stream->nb_packets = 0; 00336 stream->total_frames = stream->nb_packets; 00337 break; 00338 default: 00339 return -1; 00340 } 00341 } 00342 00343 if (rv10_write_header(s, 0, 0)) 00344 return AVERROR_INVALIDDATA; 00345 avio_flush(s->pb); 00346 return 0; 00347 } 00348 00349 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags) 00350 { 00351 uint8_t *buf1; 00352 RMMuxContext *rm = s->priv_data; 00353 AVIOContext *pb = s->pb; 00354 StreamInfo *stream = rm->audio_stream; 00355 int i; 00356 00357 /* XXX: suppress this malloc */ 00358 buf1= (uint8_t*) av_malloc( size * sizeof(uint8_t) ); 00359 00360 write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY)); 00361 00362 if (stream->enc->codec_id == CODEC_ID_AC3) { 00363 /* for AC-3, the words seem to be reversed */ 00364 for(i=0;i<size;i+=2) { 00365 buf1[i] = buf[i+1]; 00366 buf1[i+1] = buf[i]; 00367 } 00368 avio_write(pb, buf1, size); 00369 } else { 00370 avio_write(pb, buf, size); 00371 } 00372 avio_flush(pb); 00373 stream->nb_frames++; 00374 av_free(buf1); 00375 return 0; 00376 } 00377 00378 static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags) 00379 { 00380 RMMuxContext *rm = s->priv_data; 00381 AVIOContext *pb = s->pb; 00382 StreamInfo *stream = rm->video_stream; 00383 int key_frame = !!(flags & AV_PKT_FLAG_KEY); 00384 00385 /* XXX: this is incorrect: should be a parameter */ 00386 00387 /* Well, I spent some time finding the meaning of these bits. I am 00388 not sure I understood everything, but it works !! */ 00389 #if 1 00390 write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame); 00391 /* bit 7: '1' if final packet of a frame converted in several packets */ 00392 avio_w8(pb, 0x81); 00393 /* bit 7: '1' if I frame. bits 6..0 : sequence number in current 00394 frame starting from 1 */ 00395 if (key_frame) { 00396 avio_w8(pb, 0x81); 00397 } else { 00398 avio_w8(pb, 0x01); 00399 } 00400 if(size >= 0x4000){ 00401 avio_wb32(pb, size); /* total frame size */ 00402 avio_wb32(pb, size); /* offset from the start or the end */ 00403 }else{ 00404 avio_wb16(pb, 0x4000 | size); /* total frame size */ 00405 avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */ 00406 } 00407 #else 00408 /* full frame */ 00409 write_packet_header(s, size + 6); 00410 avio_w8(pb, 0xc0); 00411 avio_wb16(pb, 0x4000 + size); /* total frame size */ 00412 avio_wb16(pb, 0x4000 + packet_number * 126); /* position in stream */ 00413 #endif 00414 avio_w8(pb, stream->nb_frames & 0xff); 00415 00416 avio_write(pb, buf, size); 00417 avio_flush(pb); 00418 00419 stream->nb_frames++; 00420 return 0; 00421 } 00422 00423 static int rm_write_packet(AVFormatContext *s, AVPacket *pkt) 00424 { 00425 if (s->streams[pkt->stream_index]->codec->codec_type == 00426 AVMEDIA_TYPE_AUDIO) 00427 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags); 00428 else 00429 return rm_write_video(s, pkt->data, pkt->size, pkt->flags); 00430 } 00431 00432 static int rm_write_trailer(AVFormatContext *s) 00433 { 00434 RMMuxContext *rm = s->priv_data; 00435 int data_size, index_pos, i; 00436 AVIOContext *pb = s->pb; 00437 00438 if (s->pb->seekable) { 00439 /* end of file: finish to write header */ 00440 index_pos = avio_tell(pb); 00441 data_size = index_pos - rm->data_pos; 00442 00443 /* FIXME: write index */ 00444 00445 /* undocumented end header */ 00446 avio_wb32(pb, 0); 00447 avio_wb32(pb, 0); 00448 00449 avio_seek(pb, 0, SEEK_SET); 00450 for(i=0;i<s->nb_streams;i++) 00451 rm->streams[i].total_frames = rm->streams[i].nb_frames; 00452 rv10_write_header(s, data_size, 0); 00453 } else { 00454 /* undocumented end header */ 00455 avio_wb32(pb, 0); 00456 avio_wb32(pb, 0); 00457 } 00458 avio_flush(pb); 00459 return 0; 00460 } 00461 00462 00463 AVOutputFormat ff_rm_muxer = { 00464 "rm", 00465 NULL_IF_CONFIG_SMALL("RealMedia format"), 00466 "application/vnd.rn-realmedia", 00467 "rm,ra", 00468 sizeof(RMMuxContext), 00469 CODEC_ID_AC3, 00470 CODEC_ID_RV10, 00471 rm_write_header, 00472 rm_write_packet, 00473 rm_write_trailer, 00474 .codec_tag= (const AVCodecTag* const []){ff_rm_codec_tags, 0}, 00475 };