| 1 | /* |
| 2 | * FFM (ffserver live feed) muxer |
| 3 | * Copyright (c) 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 | |
| 22 | #include "libavutil/intreadwrite.h" |
| 23 | #include "libavutil/intfloat.h" |
| 24 | #include "libavutil/avassert.h" |
| 25 | #include "libavutil/parseutils.h" |
| 26 | #include "libavutil/opt.h" |
| 27 | #include "avformat.h" |
| 28 | #include "internal.h" |
| 29 | #include "ffm.h" |
| 30 | |
| 31 | static void flush_packet(AVFormatContext *s) |
| 32 | { |
| 33 | FFMContext *ffm = s->priv_data; |
| 34 | int fill_size, h; |
| 35 | AVIOContext *pb = s->pb; |
| 36 | |
| 37 | fill_size = ffm->packet_end - ffm->packet_ptr; |
| 38 | memset(ffm->packet_ptr, 0, fill_size); |
| 39 | |
| 40 | av_assert1(avio_tell(pb) % ffm->packet_size == 0); |
| 41 | |
| 42 | /* put header */ |
| 43 | avio_wb16(pb, PACKET_ID); |
| 44 | avio_wb16(pb, fill_size); |
| 45 | avio_wb64(pb, ffm->dts); |
| 46 | h = ffm->frame_offset; |
| 47 | if (ffm->first_packet) |
| 48 | h |= 0x8000; |
| 49 | avio_wb16(pb, h); |
| 50 | avio_write(pb, ffm->packet, ffm->packet_end - ffm->packet); |
| 51 | avio_flush(pb); |
| 52 | |
| 53 | /* prepare next packet */ |
| 54 | ffm->frame_offset = 0; /* no key frame */ |
| 55 | ffm->packet_ptr = ffm->packet; |
| 56 | ffm->first_packet = 0; |
| 57 | } |
| 58 | |
| 59 | /* 'first' is true if first data of a frame */ |
| 60 | static void ffm_write_data(AVFormatContext *s, |
| 61 | const uint8_t *buf, int size, |
| 62 | int64_t dts, int header) |
| 63 | { |
| 64 | FFMContext *ffm = s->priv_data; |
| 65 | int len; |
| 66 | |
| 67 | if (header && ffm->frame_offset == 0) { |
| 68 | ffm->frame_offset = ffm->packet_ptr - ffm->packet + FFM_HEADER_SIZE; |
| 69 | ffm->dts = dts; |
| 70 | } |
| 71 | |
| 72 | /* write as many packets as needed */ |
| 73 | while (size > 0) { |
| 74 | len = ffm->packet_end - ffm->packet_ptr; |
| 75 | if (len > size) |
| 76 | len = size; |
| 77 | memcpy(ffm->packet_ptr, buf, len); |
| 78 | |
| 79 | ffm->packet_ptr += len; |
| 80 | buf += len; |
| 81 | size -= len; |
| 82 | if (ffm->packet_ptr >= ffm->packet_end) |
| 83 | flush_packet(s); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | static void write_header_chunk(AVIOContext *pb, AVIOContext *dpb, unsigned id) |
| 88 | { |
| 89 | uint8_t *dyn_buf; |
| 90 | int dyn_size= avio_close_dyn_buf(dpb, &dyn_buf); |
| 91 | avio_wb32(pb, id); |
| 92 | avio_wb32(pb, dyn_size); |
| 93 | avio_write(pb, dyn_buf, dyn_size); |
| 94 | av_free(dyn_buf); |
| 95 | } |
| 96 | |
| 97 | static int ffm_write_header_codec_private_ctx(AVIOContext *pb, AVCodecContext *ctx, int type) |
| 98 | { |
| 99 | AVIOContext *tmp; |
| 100 | char *buf = NULL; |
| 101 | int ret; |
| 102 | const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id); |
| 103 | |
| 104 | if (!enc) |
| 105 | return AVERROR(EINVAL); |
| 106 | if (ctx->priv_data && enc->priv_class && enc->priv_data_size) { |
| 107 | if ((ret = av_opt_serialize(ctx->priv_data, AV_OPT_FLAG_ENCODING_PARAM | type, |
| 108 | AV_OPT_SERIALIZE_SKIP_DEFAULTS, &buf, '=', ',')) < 0) |
| 109 | return ret; |
| 110 | if (buf && strlen(buf)) { |
| 111 | if (avio_open_dyn_buf(&tmp) < 0) { |
| 112 | av_free(buf); |
| 113 | return AVERROR(ENOMEM); |
| 114 | } |
| 115 | avio_put_str(tmp, buf); |
| 116 | write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V')); |
| 117 | } |
| 118 | av_free(buf); |
| 119 | } |
| 120 | return 0; |
| 121 | } |
| 122 | |
| 123 | static int ffm_write_header_codec_ctx(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, int type) |
| 124 | { |
| 125 | AVIOContext *tmp; |
| 126 | char *buf = NULL; |
| 127 | uint8_t *p = NULL; |
| 128 | int ret, need_coma = 0; |
| 129 | |
| 130 | #define SKIP_DEFAULTS AV_OPT_SERIALIZE_SKIP_DEFAULTS |
| 131 | #define OPT_FLAGS_EXACT AV_OPT_SERIALIZE_OPT_FLAGS_EXACT |
| 132 | #define ENC AV_OPT_FLAG_ENCODING_PARAM |
| 133 | |
| 134 | if (avio_open_dyn_buf(&tmp) < 0) |
| 135 | return AVERROR(ENOMEM); |
| 136 | if ((ret = av_opt_serialize(ctx, ENC | type, SKIP_DEFAULTS, &buf, '=', ',')) < 0) |
| 137 | goto fail; |
| 138 | if (buf && strlen(buf)) { |
| 139 | avio_write(tmp, buf, strlen(buf)); |
| 140 | av_free(buf); |
| 141 | need_coma = 1; |
| 142 | } |
| 143 | if ((ret = av_opt_serialize(ctx, 0, SKIP_DEFAULTS | OPT_FLAGS_EXACT, &buf, '=', ',')) < 0) |
| 144 | goto fail; |
| 145 | if (buf && strlen(buf)) { |
| 146 | if (need_coma) |
| 147 | avio_w8(tmp, ','); |
| 148 | avio_write(tmp, buf, strlen(buf)); |
| 149 | av_free(buf); |
| 150 | } |
| 151 | avio_w8(tmp, 0); |
| 152 | write_header_chunk(pb, tmp, tag); |
| 153 | return 0; |
| 154 | fail: |
| 155 | av_free(buf); |
| 156 | avio_close_dyn_buf(tmp, &p); |
| 157 | av_free(p); |
| 158 | return ret; |
| 159 | |
| 160 | #undef SKIP_DEFAULTS |
| 161 | #undef OPT_FLAGS_EXACT |
| 162 | #undef ENC |
| 163 | } |
| 164 | |
| 165 | static int ffm_write_recommended_config(AVIOContext *pb, AVCodecContext *ctx, unsigned tag, |
| 166 | const char *configuration) |
| 167 | { |
| 168 | int ret; |
| 169 | const AVCodec *enc = ctx->codec ? ctx->codec : avcodec_find_encoder(ctx->codec_id); |
| 170 | AVIOContext *tmp; |
| 171 | AVDictionaryEntry *t = NULL; |
| 172 | AVDictionary *all = NULL, *comm = NULL, *prv = NULL; |
| 173 | char *buf = NULL; |
| 174 | |
| 175 | if (!enc || !enc->priv_class || !enc->priv_data_size) { |
| 176 | /* codec is not known/has no private options, so save everything as common options */ |
| 177 | if (avio_open_dyn_buf(&tmp) < 0) |
| 178 | return AVERROR(ENOMEM); |
| 179 | avio_put_str(tmp, configuration); |
| 180 | write_header_chunk(pb, tmp, tag); |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | if ((ret = av_dict_parse_string(&all, configuration, "=", ",", 0)) < 0) |
| 185 | return ret; |
| 186 | |
| 187 | while ((t = av_dict_get(all, "", t, AV_DICT_IGNORE_SUFFIX))) { |
| 188 | if (av_opt_find((void *)&enc->priv_class, t->key, NULL, 0, AV_OPT_SEARCH_FAKE_OBJ)) { |
| 189 | if ((ret = av_dict_set(&prv, t->key, t->value, 0)) < 0) |
| 190 | goto fail; |
| 191 | } else if ((ret = av_dict_set(&comm, t->key, t->value, 0)) < 0) |
| 192 | goto fail; |
| 193 | } |
| 194 | |
| 195 | if (comm) { |
| 196 | if ((ret = av_dict_get_string(comm, &buf, '=', ',')) < 0 || |
| 197 | (ret = avio_open_dyn_buf(&tmp)) < 0) |
| 198 | goto fail; |
| 199 | avio_put_str(tmp, buf); |
| 200 | av_freep(&buf); |
| 201 | write_header_chunk(pb, tmp, tag); |
| 202 | } |
| 203 | if (prv) { |
| 204 | if ((ret = av_dict_get_string(prv, &buf, '=', ',')) < 0 || |
| 205 | (ret = avio_open_dyn_buf(&tmp)) < 0) |
| 206 | goto fail; |
| 207 | avio_put_str(tmp, buf); |
| 208 | write_header_chunk(pb, tmp, MKBETAG('C', 'P', 'R', 'V')); |
| 209 | } |
| 210 | |
| 211 | fail: |
| 212 | av_free(buf); |
| 213 | av_dict_free(&all); |
| 214 | av_dict_free(&comm); |
| 215 | av_dict_free(&prv); |
| 216 | return ret; |
| 217 | } |
| 218 | |
| 219 | static int ffm_write_header(AVFormatContext *s) |
| 220 | { |
| 221 | FFMContext *ffm = s->priv_data; |
| 222 | AVDictionaryEntry *t; |
| 223 | AVStream *st; |
| 224 | AVIOContext *pb = s->pb; |
| 225 | AVCodecContext *codec; |
| 226 | int bit_rate, i, ret; |
| 227 | |
| 228 | if (t = av_dict_get(s->metadata, "creation_time", NULL, 0)) { |
| 229 | ret = av_parse_time(&ffm->start_time, t->value, 0); |
| 230 | if (ret < 0) |
| 231 | return ret; |
| 232 | } |
| 233 | |
| 234 | ffm->packet_size = FFM_PACKET_SIZE; |
| 235 | |
| 236 | /* header */ |
| 237 | avio_wl32(pb, MKTAG('F', 'F', 'M', '2')); |
| 238 | avio_wb32(pb, ffm->packet_size); |
| 239 | avio_wb64(pb, 0); /* current write position */ |
| 240 | |
| 241 | if(avio_open_dyn_buf(&pb) < 0) |
| 242 | return AVERROR(ENOMEM); |
| 243 | |
| 244 | avio_wb32(pb, s->nb_streams); |
| 245 | bit_rate = 0; |
| 246 | for(i=0;i<s->nb_streams;i++) { |
| 247 | st = s->streams[i]; |
| 248 | bit_rate += st->codec->bit_rate; |
| 249 | } |
| 250 | avio_wb32(pb, bit_rate); |
| 251 | |
| 252 | write_header_chunk(s->pb, pb, MKBETAG('M', 'A', 'I', 'N')); |
| 253 | |
| 254 | /* list of streams */ |
| 255 | for(i=0;i<s->nb_streams;i++) { |
| 256 | st = s->streams[i]; |
| 257 | avpriv_set_pts_info(st, 64, 1, 1000000); |
| 258 | if(avio_open_dyn_buf(&pb) < 0) |
| 259 | return AVERROR(ENOMEM); |
| 260 | |
| 261 | codec = st->codec; |
| 262 | /* generic info */ |
| 263 | avio_wb32(pb, codec->codec_id); |
| 264 | avio_w8(pb, codec->codec_type); |
| 265 | avio_wb32(pb, codec->bit_rate); |
| 266 | avio_wb32(pb, codec->flags); |
| 267 | avio_wb32(pb, codec->flags2); |
| 268 | avio_wb32(pb, codec->debug); |
| 269 | if (codec->flags & CODEC_FLAG_GLOBAL_HEADER) { |
| 270 | avio_wb32(pb, codec->extradata_size); |
| 271 | avio_write(pb, codec->extradata, codec->extradata_size); |
| 272 | } |
| 273 | write_header_chunk(s->pb, pb, MKBETAG('C', 'O', 'M', 'M')); |
| 274 | /* specific info */ |
| 275 | switch(codec->codec_type) { |
| 276 | case AVMEDIA_TYPE_VIDEO: |
| 277 | if (st->recommended_encoder_configuration) { |
| 278 | av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n", |
| 279 | st->recommended_encoder_configuration); |
| 280 | if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), |
| 281 | st->recommended_encoder_configuration)) < 0) |
| 282 | return ret; |
| 283 | } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'V', 'I'), AV_OPT_FLAG_VIDEO_PARAM)) < 0 || |
| 284 | (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_VIDEO_PARAM)) < 0) |
| 285 | return ret; |
| 286 | break; |
| 287 | case AVMEDIA_TYPE_AUDIO: |
| 288 | if (st->recommended_encoder_configuration) { |
| 289 | av_log(NULL, AV_LOG_DEBUG, "writing recommended configuration: %s\n", |
| 290 | st->recommended_encoder_configuration); |
| 291 | if ((ret = ffm_write_recommended_config(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), |
| 292 | st->recommended_encoder_configuration)) < 0) |
| 293 | return ret; |
| 294 | } else if ((ret = ffm_write_header_codec_ctx(s->pb, codec, MKBETAG('S', '2', 'A', 'U'), AV_OPT_FLAG_AUDIO_PARAM)) < 0 || |
| 295 | (ret = ffm_write_header_codec_private_ctx(s->pb, codec, AV_OPT_FLAG_AUDIO_PARAM)) < 0) |
| 296 | return ret; |
| 297 | break; |
| 298 | default: |
| 299 | return -1; |
| 300 | } |
| 301 | } |
| 302 | pb = s->pb; |
| 303 | |
| 304 | avio_wb64(pb, 0); // end of header |
| 305 | |
| 306 | /* flush until end of block reached */ |
| 307 | while ((avio_tell(pb) % ffm->packet_size) != 0) |
| 308 | avio_w8(pb, 0); |
| 309 | |
| 310 | avio_flush(pb); |
| 311 | |
| 312 | /* init packet mux */ |
| 313 | ffm->packet_ptr = ffm->packet; |
| 314 | ffm->packet_end = ffm->packet + ffm->packet_size - FFM_HEADER_SIZE; |
| 315 | av_assert0(ffm->packet_end >= ffm->packet); |
| 316 | ffm->frame_offset = 0; |
| 317 | ffm->dts = 0; |
| 318 | ffm->first_packet = 1; |
| 319 | |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | static int ffm_write_packet(AVFormatContext *s, AVPacket *pkt) |
| 324 | { |
| 325 | FFMContext *ffm = s->priv_data; |
| 326 | int64_t dts; |
| 327 | uint8_t header[FRAME_HEADER_SIZE+4]; |
| 328 | int header_size = FRAME_HEADER_SIZE; |
| 329 | |
| 330 | dts = ffm->start_time + pkt->dts; |
| 331 | /* packet size & key_frame */ |
| 332 | header[0] = pkt->stream_index; |
| 333 | header[1] = 0; |
| 334 | if (pkt->flags & AV_PKT_FLAG_KEY) |
| 335 | header[1] |= FLAG_KEY_FRAME; |
| 336 | AV_WB24(header+2, pkt->size); |
| 337 | AV_WB24(header+5, pkt->duration); |
| 338 | AV_WB64(header+8, ffm->start_time + pkt->pts); |
| 339 | if (pkt->pts != pkt->dts) { |
| 340 | header[1] |= FLAG_DTS; |
| 341 | AV_WB32(header+16, pkt->pts - pkt->dts); |
| 342 | header_size += 4; |
| 343 | } |
| 344 | ffm_write_data(s, header, header_size, dts, 1); |
| 345 | ffm_write_data(s, pkt->data, pkt->size, dts, 0); |
| 346 | |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | static int ffm_write_trailer(AVFormatContext *s) |
| 351 | { |
| 352 | FFMContext *ffm = s->priv_data; |
| 353 | |
| 354 | /* flush packets */ |
| 355 | if (ffm->packet_ptr > ffm->packet) |
| 356 | flush_packet(s); |
| 357 | |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | AVOutputFormat ff_ffm_muxer = { |
| 362 | .name = "ffm", |
| 363 | .long_name = NULL_IF_CONFIG_SMALL("FFM (FFserver live feed)"), |
| 364 | .extensions = "ffm", |
| 365 | .priv_data_size = sizeof(FFMContext), |
| 366 | .audio_codec = AV_CODEC_ID_MP2, |
| 367 | .video_codec = AV_CODEC_ID_MPEG1VIDEO, |
| 368 | .write_header = ffm_write_header, |
| 369 | .write_packet = ffm_write_packet, |
| 370 | .write_trailer = ffm_write_trailer, |
| 371 | .flags = AVFMT_TS_NEGATIVE, |
| 372 | }; |