| 1 | /* |
| 2 | * Live smooth streaming fragmenter |
| 3 | * Copyright (c) 2012 Martin Storsjo |
| 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 "config.h" |
| 23 | #include <float.h> |
| 24 | #if HAVE_UNISTD_H |
| 25 | #include <unistd.h> |
| 26 | #endif |
| 27 | |
| 28 | #include "avformat.h" |
| 29 | #include "internal.h" |
| 30 | #include "os_support.h" |
| 31 | #include "avc.h" |
| 32 | #include "url.h" |
| 33 | #include "isom.h" |
| 34 | |
| 35 | #include "libavutil/opt.h" |
| 36 | #include "libavutil/avstring.h" |
| 37 | #include "libavutil/file.h" |
| 38 | #include "libavutil/mathematics.h" |
| 39 | #include "libavutil/intreadwrite.h" |
| 40 | |
| 41 | typedef struct { |
| 42 | char file[1024]; |
| 43 | char infofile[1024]; |
| 44 | int64_t start_time, duration; |
| 45 | int n; |
| 46 | int64_t start_pos, size; |
| 47 | } Fragment; |
| 48 | |
| 49 | typedef struct { |
| 50 | AVFormatContext *ctx; |
| 51 | int ctx_inited; |
| 52 | char dirname[1024]; |
| 53 | uint8_t iobuf[32768]; |
| 54 | URLContext *out; // Current output stream where all output is written |
| 55 | URLContext *out2; // Auxiliary output stream where all output is also written |
| 56 | URLContext *tail_out; // The actual main output stream, if we're currently seeked back to write elsewhere |
| 57 | int64_t tail_pos, cur_pos, cur_start_pos; |
| 58 | int packets_written; |
| 59 | const char *stream_type_tag; |
| 60 | int nb_fragments, fragments_size, fragment_index; |
| 61 | Fragment **fragments; |
| 62 | |
| 63 | const char *fourcc; |
| 64 | char *private_str; |
| 65 | int packet_size; |
| 66 | int audio_tag; |
| 67 | } OutputStream; |
| 68 | |
| 69 | typedef struct { |
| 70 | const AVClass *class; /* Class for private options. */ |
| 71 | int window_size; |
| 72 | int extra_window_size; |
| 73 | int lookahead_count; |
| 74 | int min_frag_duration; |
| 75 | int remove_at_exit; |
| 76 | OutputStream *streams; |
| 77 | int has_video, has_audio; |
| 78 | int nb_fragments; |
| 79 | } SmoothStreamingContext; |
| 80 | |
| 81 | static int ism_write(void *opaque, uint8_t *buf, int buf_size) |
| 82 | { |
| 83 | OutputStream *os = opaque; |
| 84 | if (os->out) |
| 85 | ffurl_write(os->out, buf, buf_size); |
| 86 | if (os->out2) |
| 87 | ffurl_write(os->out2, buf, buf_size); |
| 88 | os->cur_pos += buf_size; |
| 89 | if (os->cur_pos >= os->tail_pos) |
| 90 | os->tail_pos = os->cur_pos; |
| 91 | return buf_size; |
| 92 | } |
| 93 | |
| 94 | static int64_t ism_seek(void *opaque, int64_t offset, int whence) |
| 95 | { |
| 96 | OutputStream *os = opaque; |
| 97 | int i; |
| 98 | if (whence != SEEK_SET) |
| 99 | return AVERROR(ENOSYS); |
| 100 | if (os->tail_out) { |
| 101 | if (os->out) { |
| 102 | ffurl_close(os->out); |
| 103 | } |
| 104 | if (os->out2) { |
| 105 | ffurl_close(os->out2); |
| 106 | } |
| 107 | os->out = os->tail_out; |
| 108 | os->out2 = NULL; |
| 109 | os->tail_out = NULL; |
| 110 | } |
| 111 | if (offset >= os->cur_start_pos) { |
| 112 | if (os->out) |
| 113 | ffurl_seek(os->out, offset - os->cur_start_pos, SEEK_SET); |
| 114 | os->cur_pos = offset; |
| 115 | return offset; |
| 116 | } |
| 117 | for (i = os->nb_fragments - 1; i >= 0; i--) { |
| 118 | Fragment *frag = os->fragments[i]; |
| 119 | if (offset >= frag->start_pos && offset < frag->start_pos + frag->size) { |
| 120 | int ret; |
| 121 | AVDictionary *opts = NULL; |
| 122 | os->tail_out = os->out; |
| 123 | av_dict_set(&opts, "truncate", "0", 0); |
| 124 | ret = ffurl_open(&os->out, frag->file, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts); |
| 125 | av_dict_free(&opts); |
| 126 | if (ret < 0) { |
| 127 | os->out = os->tail_out; |
| 128 | os->tail_out = NULL; |
| 129 | return ret; |
| 130 | } |
| 131 | av_dict_set(&opts, "truncate", "0", 0); |
| 132 | ffurl_open(&os->out2, frag->infofile, AVIO_FLAG_READ_WRITE, &os->ctx->interrupt_callback, &opts); |
| 133 | av_dict_free(&opts); |
| 134 | ffurl_seek(os->out, offset - frag->start_pos, SEEK_SET); |
| 135 | if (os->out2) |
| 136 | ffurl_seek(os->out2, offset - frag->start_pos, SEEK_SET); |
| 137 | os->cur_pos = offset; |
| 138 | return offset; |
| 139 | } |
| 140 | } |
| 141 | return AVERROR(EIO); |
| 142 | } |
| 143 | |
| 144 | static void get_private_data(OutputStream *os) |
| 145 | { |
| 146 | AVCodecContext *codec = os->ctx->streams[0]->codec; |
| 147 | uint8_t *ptr = codec->extradata; |
| 148 | int size = codec->extradata_size; |
| 149 | int i; |
| 150 | if (codec->codec_id == AV_CODEC_ID_H264) { |
| 151 | ff_avc_write_annexb_extradata(ptr, &ptr, &size); |
| 152 | if (!ptr) |
| 153 | ptr = codec->extradata; |
| 154 | } |
| 155 | if (!ptr) |
| 156 | return; |
| 157 | os->private_str = av_mallocz(2*size + 1); |
| 158 | if (!os->private_str) |
| 159 | goto fail; |
| 160 | for (i = 0; i < size; i++) |
| 161 | snprintf(&os->private_str[2*i], 3, "%02x", ptr[i]); |
| 162 | fail: |
| 163 | if (ptr != codec->extradata) |
| 164 | av_free(ptr); |
| 165 | } |
| 166 | |
| 167 | static void ism_free(AVFormatContext *s) |
| 168 | { |
| 169 | SmoothStreamingContext *c = s->priv_data; |
| 170 | int i, j; |
| 171 | if (!c->streams) |
| 172 | return; |
| 173 | for (i = 0; i < s->nb_streams; i++) { |
| 174 | OutputStream *os = &c->streams[i]; |
| 175 | ffurl_close(os->out); |
| 176 | ffurl_close(os->out2); |
| 177 | ffurl_close(os->tail_out); |
| 178 | os->out = os->out2 = os->tail_out = NULL; |
| 179 | if (os->ctx && os->ctx_inited) |
| 180 | av_write_trailer(os->ctx); |
| 181 | if (os->ctx && os->ctx->pb) |
| 182 | av_free(os->ctx->pb); |
| 183 | if (os->ctx) |
| 184 | avformat_free_context(os->ctx); |
| 185 | av_free(os->private_str); |
| 186 | for (j = 0; j < os->nb_fragments; j++) |
| 187 | av_free(os->fragments[j]); |
| 188 | av_free(os->fragments); |
| 189 | } |
| 190 | av_freep(&c->streams); |
| 191 | } |
| 192 | |
| 193 | static void output_chunk_list(OutputStream *os, AVIOContext *out, int final, int skip, int window_size) |
| 194 | { |
| 195 | int removed = 0, i, start = 0; |
| 196 | if (os->nb_fragments <= 0) |
| 197 | return; |
| 198 | if (os->fragments[0]->n > 0) |
| 199 | removed = 1; |
| 200 | if (final) |
| 201 | skip = 0; |
| 202 | if (window_size) |
| 203 | start = FFMAX(os->nb_fragments - skip - window_size, 0); |
| 204 | for (i = start; i < os->nb_fragments - skip; i++) { |
| 205 | Fragment *frag = os->fragments[i]; |
| 206 | if (!final || removed) |
| 207 | avio_printf(out, "<c t=\"%"PRIu64"\" d=\"%"PRIu64"\" />\n", frag->start_time, frag->duration); |
| 208 | else |
| 209 | avio_printf(out, "<c n=\"%d\" d=\"%"PRIu64"\" />\n", frag->n, frag->duration); |
| 210 | } |
| 211 | } |
| 212 | |
| 213 | static int write_manifest(AVFormatContext *s, int final) |
| 214 | { |
| 215 | SmoothStreamingContext *c = s->priv_data; |
| 216 | AVIOContext *out; |
| 217 | char filename[1024], temp_filename[1024]; |
| 218 | int ret, i, video_chunks = 0, audio_chunks = 0, video_streams = 0, audio_streams = 0; |
| 219 | int64_t duration = 0; |
| 220 | |
| 221 | snprintf(filename, sizeof(filename), "%s/Manifest", s->filename); |
| 222 | snprintf(temp_filename, sizeof(temp_filename), "%s/Manifest.tmp", s->filename); |
| 223 | ret = avio_open2(&out, temp_filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL); |
| 224 | if (ret < 0) { |
| 225 | av_log(s, AV_LOG_ERROR, "Unable to open %s for writing\n", temp_filename); |
| 226 | return ret; |
| 227 | } |
| 228 | avio_printf(out, "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n"); |
| 229 | for (i = 0; i < s->nb_streams; i++) { |
| 230 | OutputStream *os = &c->streams[i]; |
| 231 | if (os->nb_fragments > 0) { |
| 232 | Fragment *last = os->fragments[os->nb_fragments - 1]; |
| 233 | duration = last->start_time + last->duration; |
| 234 | } |
| 235 | if (s->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) { |
| 236 | video_chunks = os->nb_fragments; |
| 237 | video_streams++; |
| 238 | } else { |
| 239 | audio_chunks = os->nb_fragments; |
| 240 | audio_streams++; |
| 241 | } |
| 242 | } |
| 243 | if (!final) { |
| 244 | duration = 0; |
| 245 | video_chunks = audio_chunks = 0; |
| 246 | } |
| 247 | if (c->window_size) { |
| 248 | video_chunks = FFMIN(video_chunks, c->window_size); |
| 249 | audio_chunks = FFMIN(audio_chunks, c->window_size); |
| 250 | } |
| 251 | avio_printf(out, "<SmoothStreamingMedia MajorVersion=\"2\" MinorVersion=\"0\" Duration=\"%"PRIu64"\"", duration); |
| 252 | if (!final) |
| 253 | avio_printf(out, " IsLive=\"true\" LookAheadFragmentCount=\"%d\" DVRWindowLength=\"0\"", c->lookahead_count); |
| 254 | avio_printf(out, ">\n"); |
| 255 | if (c->has_video) { |
| 256 | int last = -1, index = 0; |
| 257 | avio_printf(out, "<StreamIndex Type=\"video\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(video={start time})\">\n", video_streams, video_chunks); |
| 258 | for (i = 0; i < s->nb_streams; i++) { |
| 259 | OutputStream *os = &c->streams[i]; |
| 260 | if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_VIDEO) |
| 261 | continue; |
| 262 | last = i; |
| 263 | avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" MaxWidth=\"%d\" MaxHeight=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->width, s->streams[i]->codec->height, os->private_str); |
| 264 | index++; |
| 265 | } |
| 266 | output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size); |
| 267 | avio_printf(out, "</StreamIndex>\n"); |
| 268 | } |
| 269 | if (c->has_audio) { |
| 270 | int last = -1, index = 0; |
| 271 | avio_printf(out, "<StreamIndex Type=\"audio\" QualityLevels=\"%d\" Chunks=\"%d\" Url=\"QualityLevels({bitrate})/Fragments(audio={start time})\">\n", audio_streams, audio_chunks); |
| 272 | for (i = 0; i < s->nb_streams; i++) { |
| 273 | OutputStream *os = &c->streams[i]; |
| 274 | if (s->streams[i]->codec->codec_type != AVMEDIA_TYPE_AUDIO) |
| 275 | continue; |
| 276 | last = i; |
| 277 | avio_printf(out, "<QualityLevel Index=\"%d\" Bitrate=\"%d\" FourCC=\"%s\" SamplingRate=\"%d\" Channels=\"%d\" BitsPerSample=\"16\" PacketSize=\"%d\" AudioTag=\"%d\" CodecPrivateData=\"%s\" />\n", index, s->streams[i]->codec->bit_rate, os->fourcc, s->streams[i]->codec->sample_rate, s->streams[i]->codec->channels, os->packet_size, os->audio_tag, os->private_str); |
| 278 | index++; |
| 279 | } |
| 280 | output_chunk_list(&c->streams[last], out, final, c->lookahead_count, c->window_size); |
| 281 | avio_printf(out, "</StreamIndex>\n"); |
| 282 | } |
| 283 | avio_printf(out, "</SmoothStreamingMedia>\n"); |
| 284 | avio_flush(out); |
| 285 | avio_close(out); |
| 286 | return ff_rename(temp_filename, filename, s); |
| 287 | } |
| 288 | |
| 289 | static int ism_write_header(AVFormatContext *s) |
| 290 | { |
| 291 | SmoothStreamingContext *c = s->priv_data; |
| 292 | int ret = 0, i; |
| 293 | AVOutputFormat *oformat; |
| 294 | |
| 295 | if (mkdir(s->filename, 0777) == -1 && errno != EEXIST) { |
| 296 | ret = AVERROR(errno); |
| 297 | av_log(s, AV_LOG_ERROR, "mkdir failed\n"); |
| 298 | goto fail; |
| 299 | } |
| 300 | |
| 301 | oformat = av_guess_format("ismv", NULL, NULL); |
| 302 | if (!oformat) { |
| 303 | ret = AVERROR_MUXER_NOT_FOUND; |
| 304 | goto fail; |
| 305 | } |
| 306 | |
| 307 | c->streams = av_mallocz_array(s->nb_streams, sizeof(*c->streams)); |
| 308 | if (!c->streams) { |
| 309 | ret = AVERROR(ENOMEM); |
| 310 | goto fail; |
| 311 | } |
| 312 | |
| 313 | for (i = 0; i < s->nb_streams; i++) { |
| 314 | OutputStream *os = &c->streams[i]; |
| 315 | AVFormatContext *ctx; |
| 316 | AVStream *st; |
| 317 | AVDictionary *opts = NULL; |
| 318 | |
| 319 | if (!s->streams[i]->codec->bit_rate) { |
| 320 | av_log(s, AV_LOG_ERROR, "No bit rate set for stream %d\n", i); |
| 321 | ret = AVERROR(EINVAL); |
| 322 | goto fail; |
| 323 | } |
| 324 | snprintf(os->dirname, sizeof(os->dirname), "%s/QualityLevels(%d)", s->filename, s->streams[i]->codec->bit_rate); |
| 325 | if (mkdir(os->dirname, 0777) == -1 && errno != EEXIST) { |
| 326 | ret = AVERROR(errno); |
| 327 | av_log(s, AV_LOG_ERROR, "mkdir failed\n"); |
| 328 | goto fail; |
| 329 | } |
| 330 | |
| 331 | ctx = avformat_alloc_context(); |
| 332 | if (!ctx) { |
| 333 | ret = AVERROR(ENOMEM); |
| 334 | goto fail; |
| 335 | } |
| 336 | os->ctx = ctx; |
| 337 | ctx->oformat = oformat; |
| 338 | ctx->interrupt_callback = s->interrupt_callback; |
| 339 | |
| 340 | if (!(st = avformat_new_stream(ctx, NULL))) { |
| 341 | ret = AVERROR(ENOMEM); |
| 342 | goto fail; |
| 343 | } |
| 344 | avcodec_copy_context(st->codec, s->streams[i]->codec); |
| 345 | st->sample_aspect_ratio = s->streams[i]->sample_aspect_ratio; |
| 346 | st->time_base = s->streams[i]->time_base; |
| 347 | |
| 348 | ctx->pb = avio_alloc_context(os->iobuf, sizeof(os->iobuf), AVIO_FLAG_WRITE, os, NULL, ism_write, ism_seek); |
| 349 | if (!ctx->pb) { |
| 350 | ret = AVERROR(ENOMEM); |
| 351 | goto fail; |
| 352 | } |
| 353 | |
| 354 | av_dict_set_int(&opts, "ism_lookahead", c->lookahead_count, 0); |
| 355 | av_dict_set(&opts, "movflags", "frag_custom", 0); |
| 356 | if ((ret = avformat_write_header(ctx, &opts)) < 0) { |
| 357 | goto fail; |
| 358 | } |
| 359 | os->ctx_inited = 1; |
| 360 | avio_flush(ctx->pb); |
| 361 | av_dict_free(&opts); |
| 362 | s->streams[i]->time_base = st->time_base; |
| 363 | if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) { |
| 364 | c->has_video = 1; |
| 365 | os->stream_type_tag = "video"; |
| 366 | if (st->codec->codec_id == AV_CODEC_ID_H264) { |
| 367 | os->fourcc = "H264"; |
| 368 | } else if (st->codec->codec_id == AV_CODEC_ID_VC1) { |
| 369 | os->fourcc = "WVC1"; |
| 370 | } else { |
| 371 | av_log(s, AV_LOG_ERROR, "Unsupported video codec\n"); |
| 372 | ret = AVERROR(EINVAL); |
| 373 | goto fail; |
| 374 | } |
| 375 | } else { |
| 376 | c->has_audio = 1; |
| 377 | os->stream_type_tag = "audio"; |
| 378 | if (st->codec->codec_id == AV_CODEC_ID_AAC) { |
| 379 | os->fourcc = "AACL"; |
| 380 | os->audio_tag = 0xff; |
| 381 | } else if (st->codec->codec_id == AV_CODEC_ID_WMAPRO) { |
| 382 | os->fourcc = "WMAP"; |
| 383 | os->audio_tag = 0x0162; |
| 384 | } else { |
| 385 | av_log(s, AV_LOG_ERROR, "Unsupported audio codec\n"); |
| 386 | ret = AVERROR(EINVAL); |
| 387 | goto fail; |
| 388 | } |
| 389 | os->packet_size = st->codec->block_align ? st->codec->block_align : 4; |
| 390 | } |
| 391 | get_private_data(os); |
| 392 | } |
| 393 | |
| 394 | if (!c->has_video && c->min_frag_duration <= 0) { |
| 395 | av_log(s, AV_LOG_WARNING, "no video stream and no min frag duration set\n"); |
| 396 | ret = AVERROR(EINVAL); |
| 397 | } |
| 398 | ret = write_manifest(s, 0); |
| 399 | |
| 400 | fail: |
| 401 | if (ret) |
| 402 | ism_free(s); |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | static int parse_fragment(AVFormatContext *s, const char *filename, int64_t *start_ts, int64_t *duration, int64_t *moof_size, int64_t size) |
| 407 | { |
| 408 | AVIOContext *in; |
| 409 | int ret; |
| 410 | uint32_t len; |
| 411 | if ((ret = avio_open2(&in, filename, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0) |
| 412 | return ret; |
| 413 | ret = AVERROR(EIO); |
| 414 | *moof_size = avio_rb32(in); |
| 415 | if (*moof_size < 8 || *moof_size > size) |
| 416 | goto fail; |
| 417 | if (avio_rl32(in) != MKTAG('m','o','o','f')) |
| 418 | goto fail; |
| 419 | len = avio_rb32(in); |
| 420 | if (len > *moof_size) |
| 421 | goto fail; |
| 422 | if (avio_rl32(in) != MKTAG('m','f','h','d')) |
| 423 | goto fail; |
| 424 | avio_seek(in, len - 8, SEEK_CUR); |
| 425 | avio_rb32(in); /* traf size */ |
| 426 | if (avio_rl32(in) != MKTAG('t','r','a','f')) |
| 427 | goto fail; |
| 428 | while (avio_tell(in) < *moof_size) { |
| 429 | uint32_t len = avio_rb32(in); |
| 430 | uint32_t tag = avio_rl32(in); |
| 431 | int64_t end = avio_tell(in) + len - 8; |
| 432 | if (len < 8 || len >= *moof_size) |
| 433 | goto fail; |
| 434 | if (tag == MKTAG('u','u','i','d')) { |
| 435 | static const uint8_t tfxd[] = { |
| 436 | 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6, |
| 437 | 0x80, 0xe2, 0x14, 0x1d, 0xaf, 0xf7, 0x57, 0xb2 |
| 438 | }; |
| 439 | uint8_t uuid[16]; |
| 440 | avio_read(in, uuid, 16); |
| 441 | if (!memcmp(uuid, tfxd, 16) && len >= 8 + 16 + 4 + 16) { |
| 442 | avio_seek(in, 4, SEEK_CUR); |
| 443 | *start_ts = avio_rb64(in); |
| 444 | *duration = avio_rb64(in); |
| 445 | ret = 0; |
| 446 | break; |
| 447 | } |
| 448 | } |
| 449 | avio_seek(in, end, SEEK_SET); |
| 450 | } |
| 451 | fail: |
| 452 | avio_close(in); |
| 453 | return ret; |
| 454 | } |
| 455 | |
| 456 | static int add_fragment(OutputStream *os, const char *file, const char *infofile, int64_t start_time, int64_t duration, int64_t start_pos, int64_t size) |
| 457 | { |
| 458 | int err; |
| 459 | Fragment *frag; |
| 460 | if (os->nb_fragments >= os->fragments_size) { |
| 461 | os->fragments_size = (os->fragments_size + 1) * 2; |
| 462 | if ((err = av_reallocp(&os->fragments, sizeof(*os->fragments) * |
| 463 | os->fragments_size)) < 0) { |
| 464 | os->fragments_size = 0; |
| 465 | os->nb_fragments = 0; |
| 466 | return err; |
| 467 | } |
| 468 | } |
| 469 | frag = av_mallocz(sizeof(*frag)); |
| 470 | if (!frag) |
| 471 | return AVERROR(ENOMEM); |
| 472 | av_strlcpy(frag->file, file, sizeof(frag->file)); |
| 473 | av_strlcpy(frag->infofile, infofile, sizeof(frag->infofile)); |
| 474 | frag->start_time = start_time; |
| 475 | frag->duration = duration; |
| 476 | frag->start_pos = start_pos; |
| 477 | frag->size = size; |
| 478 | frag->n = os->fragment_index; |
| 479 | os->fragments[os->nb_fragments++] = frag; |
| 480 | os->fragment_index++; |
| 481 | return 0; |
| 482 | } |
| 483 | |
| 484 | static int copy_moof(AVFormatContext *s, const char* infile, const char *outfile, int64_t size) |
| 485 | { |
| 486 | AVIOContext *in, *out; |
| 487 | int ret = 0; |
| 488 | if ((ret = avio_open2(&in, infile, AVIO_FLAG_READ, &s->interrupt_callback, NULL)) < 0) |
| 489 | return ret; |
| 490 | if ((ret = avio_open2(&out, outfile, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL)) < 0) { |
| 491 | avio_close(in); |
| 492 | return ret; |
| 493 | } |
| 494 | while (size > 0) { |
| 495 | uint8_t buf[8192]; |
| 496 | int n = FFMIN(size, sizeof(buf)); |
| 497 | n = avio_read(in, buf, n); |
| 498 | if (n <= 0) { |
| 499 | ret = AVERROR(EIO); |
| 500 | break; |
| 501 | } |
| 502 | avio_write(out, buf, n); |
| 503 | size -= n; |
| 504 | } |
| 505 | avio_flush(out); |
| 506 | avio_close(out); |
| 507 | avio_close(in); |
| 508 | return ret; |
| 509 | } |
| 510 | |
| 511 | static int ism_flush(AVFormatContext *s, int final) |
| 512 | { |
| 513 | SmoothStreamingContext *c = s->priv_data; |
| 514 | int i, ret = 0; |
| 515 | |
| 516 | for (i = 0; i < s->nb_streams; i++) { |
| 517 | OutputStream *os = &c->streams[i]; |
| 518 | char filename[1024], target_filename[1024], header_filename[1024]; |
| 519 | int64_t size; |
| 520 | int64_t start_ts, duration, moof_size; |
| 521 | if (!os->packets_written) |
| 522 | continue; |
| 523 | |
| 524 | snprintf(filename, sizeof(filename), "%s/temp", os->dirname); |
| 525 | ret = ffurl_open(&os->out, filename, AVIO_FLAG_WRITE, &s->interrupt_callback, NULL); |
| 526 | if (ret < 0) |
| 527 | break; |
| 528 | os->cur_start_pos = os->tail_pos; |
| 529 | av_write_frame(os->ctx, NULL); |
| 530 | avio_flush(os->ctx->pb); |
| 531 | os->packets_written = 0; |
| 532 | if (!os->out || os->tail_out) |
| 533 | return AVERROR(EIO); |
| 534 | |
| 535 | ffurl_close(os->out); |
| 536 | os->out = NULL; |
| 537 | size = os->tail_pos - os->cur_start_pos; |
| 538 | if ((ret = parse_fragment(s, filename, &start_ts, &duration, &moof_size, size)) < 0) |
| 539 | break; |
| 540 | snprintf(header_filename, sizeof(header_filename), "%s/FragmentInfo(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts); |
| 541 | snprintf(target_filename, sizeof(target_filename), "%s/Fragments(%s=%"PRIu64")", os->dirname, os->stream_type_tag, start_ts); |
| 542 | copy_moof(s, filename, header_filename, moof_size); |
| 543 | ret = ff_rename(filename, target_filename, s); |
| 544 | if (ret < 0) |
| 545 | break; |
| 546 | add_fragment(os, target_filename, header_filename, start_ts, duration, |
| 547 | os->cur_start_pos, size); |
| 548 | } |
| 549 | |
| 550 | if (c->window_size || (final && c->remove_at_exit)) { |
| 551 | for (i = 0; i < s->nb_streams; i++) { |
| 552 | OutputStream *os = &c->streams[i]; |
| 553 | int j; |
| 554 | int remove = os->nb_fragments - c->window_size - c->extra_window_size - c->lookahead_count; |
| 555 | if (final && c->remove_at_exit) |
| 556 | remove = os->nb_fragments; |
| 557 | if (remove > 0) { |
| 558 | for (j = 0; j < remove; j++) { |
| 559 | unlink(os->fragments[j]->file); |
| 560 | unlink(os->fragments[j]->infofile); |
| 561 | av_free(os->fragments[j]); |
| 562 | } |
| 563 | os->nb_fragments -= remove; |
| 564 | memmove(os->fragments, os->fragments + remove, os->nb_fragments * sizeof(*os->fragments)); |
| 565 | } |
| 566 | if (final && c->remove_at_exit) |
| 567 | rmdir(os->dirname); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | if (ret >= 0) |
| 572 | ret = write_manifest(s, final); |
| 573 | return ret; |
| 574 | } |
| 575 | |
| 576 | static int ism_write_packet(AVFormatContext *s, AVPacket *pkt) |
| 577 | { |
| 578 | SmoothStreamingContext *c = s->priv_data; |
| 579 | AVStream *st = s->streams[pkt->stream_index]; |
| 580 | OutputStream *os = &c->streams[pkt->stream_index]; |
| 581 | int64_t end_dts = (c->nb_fragments + 1) * (int64_t) c->min_frag_duration; |
| 582 | int ret; |
| 583 | |
| 584 | if (st->first_dts == AV_NOPTS_VALUE) |
| 585 | st->first_dts = pkt->dts; |
| 586 | |
| 587 | if ((!c->has_video || st->codec->codec_type == AVMEDIA_TYPE_VIDEO) && |
| 588 | av_compare_ts(pkt->dts - st->first_dts, st->time_base, |
| 589 | end_dts, AV_TIME_BASE_Q) >= 0 && |
| 590 | pkt->flags & AV_PKT_FLAG_KEY && os->packets_written) { |
| 591 | |
| 592 | if ((ret = ism_flush(s, 0)) < 0) |
| 593 | return ret; |
| 594 | c->nb_fragments++; |
| 595 | } |
| 596 | |
| 597 | os->packets_written++; |
| 598 | return ff_write_chained(os->ctx, 0, pkt, s, 0); |
| 599 | } |
| 600 | |
| 601 | static int ism_write_trailer(AVFormatContext *s) |
| 602 | { |
| 603 | SmoothStreamingContext *c = s->priv_data; |
| 604 | ism_flush(s, 1); |
| 605 | |
| 606 | if (c->remove_at_exit) { |
| 607 | char filename[1024]; |
| 608 | snprintf(filename, sizeof(filename), "%s/Manifest", s->filename); |
| 609 | unlink(filename); |
| 610 | rmdir(s->filename); |
| 611 | } |
| 612 | |
| 613 | ism_free(s); |
| 614 | return 0; |
| 615 | } |
| 616 | |
| 617 | #define OFFSET(x) offsetof(SmoothStreamingContext, x) |
| 618 | #define E AV_OPT_FLAG_ENCODING_PARAM |
| 619 | static const AVOption options[] = { |
| 620 | { "window_size", "number of fragments kept in the manifest", OFFSET(window_size), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, E }, |
| 621 | { "extra_window_size", "number of fragments kept outside of the manifest before removing from disk", OFFSET(extra_window_size), AV_OPT_TYPE_INT, { .i64 = 5 }, 0, INT_MAX, E }, |
| 622 | { "lookahead_count", "number of lookahead fragments", OFFSET(lookahead_count), AV_OPT_TYPE_INT, { .i64 = 2 }, 0, INT_MAX, E }, |
| 623 | { "min_frag_duration", "minimum fragment duration (in microseconds)", OFFSET(min_frag_duration), AV_OPT_TYPE_INT64, { .i64 = 5000000 }, 0, INT_MAX, E }, |
| 624 | { "remove_at_exit", "remove all fragments when finished", OFFSET(remove_at_exit), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 1, E }, |
| 625 | { NULL }, |
| 626 | }; |
| 627 | |
| 628 | static const AVClass ism_class = { |
| 629 | .class_name = "smooth streaming muxer", |
| 630 | .item_name = av_default_item_name, |
| 631 | .option = options, |
| 632 | .version = LIBAVUTIL_VERSION_INT, |
| 633 | }; |
| 634 | |
| 635 | |
| 636 | AVOutputFormat ff_smoothstreaming_muxer = { |
| 637 | .name = "smoothstreaming", |
| 638 | .long_name = NULL_IF_CONFIG_SMALL("Smooth Streaming Muxer"), |
| 639 | .priv_data_size = sizeof(SmoothStreamingContext), |
| 640 | .audio_codec = AV_CODEC_ID_AAC, |
| 641 | .video_codec = AV_CODEC_ID_H264, |
| 642 | .flags = AVFMT_GLOBALHEADER | AVFMT_NOFILE, |
| 643 | .write_header = ism_write_header, |
| 644 | .write_packet = ism_write_packet, |
| 645 | .write_trailer = ism_write_trailer, |
| 646 | .codec_tag = (const AVCodecTag* const []){ ff_mp4_obj_type, 0 }, |
| 647 | .priv_class = &ism_class, |
| 648 | }; |