| 1 | /* |
| 2 | * MPEG1/2 muxer |
| 3 | * Copyright (c) 2000, 2001, 2002 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 <stdint.h> |
| 23 | |
| 24 | #include "libavutil/attributes.h" |
| 25 | #include "libavutil/fifo.h" |
| 26 | #include "libavutil/log.h" |
| 27 | #include "libavutil/mathematics.h" |
| 28 | #include "libavutil/opt.h" |
| 29 | |
| 30 | #include "libavcodec/put_bits.h" |
| 31 | |
| 32 | #include "avformat.h" |
| 33 | #include "internal.h" |
| 34 | #include "mpeg.h" |
| 35 | |
| 36 | #define MAX_PAYLOAD_SIZE 4096 |
| 37 | |
| 38 | #undef NDEBUG |
| 39 | #include <assert.h> |
| 40 | |
| 41 | typedef struct PacketDesc { |
| 42 | int64_t pts; |
| 43 | int64_t dts; |
| 44 | int size; |
| 45 | int unwritten_size; |
| 46 | int flags; |
| 47 | struct PacketDesc *next; |
| 48 | } PacketDesc; |
| 49 | |
| 50 | typedef struct { |
| 51 | AVFifoBuffer *fifo; |
| 52 | uint8_t id; |
| 53 | int max_buffer_size; /* in bytes */ |
| 54 | int buffer_index; |
| 55 | PacketDesc *predecode_packet; |
| 56 | PacketDesc *premux_packet; |
| 57 | PacketDesc **next_packet; |
| 58 | int packet_number; |
| 59 | uint8_t lpcm_header[3]; |
| 60 | int lpcm_align; |
| 61 | int bytes_to_iframe; |
| 62 | int align_iframe; |
| 63 | int64_t vobu_start_pts; |
| 64 | } StreamInfo; |
| 65 | |
| 66 | typedef struct { |
| 67 | const AVClass *class; |
| 68 | int packet_size; /* required packet size */ |
| 69 | int packet_number; |
| 70 | int pack_header_freq; /* frequency (in packets^-1) at which we send pack headers */ |
| 71 | int system_header_freq; |
| 72 | int system_header_size; |
| 73 | int user_mux_rate; /* bitrate in units of bits/s */ |
| 74 | int mux_rate; /* bitrate in units of 50 bytes/s */ |
| 75 | /* stream info */ |
| 76 | int audio_bound; |
| 77 | int video_bound; |
| 78 | int is_mpeg2; |
| 79 | int is_vcd; |
| 80 | int is_svcd; |
| 81 | int is_dvd; |
| 82 | int64_t last_scr; /* current system clock */ |
| 83 | |
| 84 | double vcd_padding_bitrate; // FIXME floats |
| 85 | int64_t vcd_padding_bytes_written; |
| 86 | |
| 87 | int preload; |
| 88 | } MpegMuxContext; |
| 89 | |
| 90 | extern AVOutputFormat ff_mpeg1vcd_muxer; |
| 91 | extern AVOutputFormat ff_mpeg2dvd_muxer; |
| 92 | extern AVOutputFormat ff_mpeg2svcd_muxer; |
| 93 | extern AVOutputFormat ff_mpeg2vob_muxer; |
| 94 | |
| 95 | static int put_pack_header(AVFormatContext *ctx, uint8_t *buf, |
| 96 | int64_t timestamp) |
| 97 | { |
| 98 | MpegMuxContext *s = ctx->priv_data; |
| 99 | PutBitContext pb; |
| 100 | |
| 101 | init_put_bits(&pb, buf, 128); |
| 102 | |
| 103 | put_bits32(&pb, PACK_START_CODE); |
| 104 | if (s->is_mpeg2) |
| 105 | put_bits(&pb, 2, 0x1); |
| 106 | else |
| 107 | put_bits(&pb, 4, 0x2); |
| 108 | put_bits(&pb, 3, (uint32_t)((timestamp >> 30) & 0x07)); |
| 109 | put_bits(&pb, 1, 1); |
| 110 | put_bits(&pb, 15, (uint32_t)((timestamp >> 15) & 0x7fff)); |
| 111 | put_bits(&pb, 1, 1); |
| 112 | put_bits(&pb, 15, (uint32_t)((timestamp) & 0x7fff)); |
| 113 | put_bits(&pb, 1, 1); |
| 114 | if (s->is_mpeg2) |
| 115 | /* clock extension */ |
| 116 | put_bits(&pb, 9, 0); |
| 117 | put_bits(&pb, 1, 1); |
| 118 | put_bits(&pb, 22, s->mux_rate); |
| 119 | put_bits(&pb, 1, 1); |
| 120 | if (s->is_mpeg2) { |
| 121 | put_bits(&pb, 1, 1); |
| 122 | put_bits(&pb, 5, 0x1f); /* reserved */ |
| 123 | put_bits(&pb, 3, 0); /* stuffing length */ |
| 124 | } |
| 125 | flush_put_bits(&pb); |
| 126 | return put_bits_ptr(&pb) - pb.buf; |
| 127 | } |
| 128 | |
| 129 | static int put_system_header(AVFormatContext *ctx, uint8_t *buf, |
| 130 | int only_for_stream_id) |
| 131 | { |
| 132 | MpegMuxContext *s = ctx->priv_data; |
| 133 | int size, i, private_stream_coded, id; |
| 134 | PutBitContext pb; |
| 135 | |
| 136 | init_put_bits(&pb, buf, 128); |
| 137 | |
| 138 | put_bits32(&pb, SYSTEM_HEADER_START_CODE); |
| 139 | put_bits(&pb, 16, 0); |
| 140 | put_bits(&pb, 1, 1); |
| 141 | |
| 142 | /* maximum bit rate of the multiplexed stream */ |
| 143 | put_bits(&pb, 22, s->mux_rate); |
| 144 | put_bits(&pb, 1, 1); /* marker */ |
| 145 | if (s->is_vcd && only_for_stream_id == VIDEO_ID) { |
| 146 | /* This header applies only to the video stream |
| 147 | * (see VCD standard p. IV-7) */ |
| 148 | put_bits(&pb, 6, 0); |
| 149 | } else |
| 150 | put_bits(&pb, 6, s->audio_bound); |
| 151 | |
| 152 | if (s->is_vcd) { |
| 153 | /* see VCD standard, p. IV-7 */ |
| 154 | put_bits(&pb, 1, 0); |
| 155 | put_bits(&pb, 1, 1); |
| 156 | } else { |
| 157 | put_bits(&pb, 1, 0); /* variable bitrate */ |
| 158 | put_bits(&pb, 1, 0); /* non constrainted bit stream */ |
| 159 | } |
| 160 | |
| 161 | if (s->is_vcd || s->is_dvd) { |
| 162 | /* see VCD standard p IV-7 */ |
| 163 | put_bits(&pb, 1, 1); /* audio locked */ |
| 164 | put_bits(&pb, 1, 1); /* video locked */ |
| 165 | } else { |
| 166 | put_bits(&pb, 1, 0); /* audio locked */ |
| 167 | put_bits(&pb, 1, 0); /* video locked */ |
| 168 | } |
| 169 | |
| 170 | put_bits(&pb, 1, 1); /* marker */ |
| 171 | |
| 172 | if (s->is_vcd && (only_for_stream_id & 0xe0) == AUDIO_ID) { |
| 173 | /* This header applies only to the audio stream |
| 174 | * (see VCD standard p. IV-7) */ |
| 175 | put_bits(&pb, 5, 0); |
| 176 | } else |
| 177 | put_bits(&pb, 5, s->video_bound); |
| 178 | |
| 179 | if (s->is_dvd) { |
| 180 | put_bits(&pb, 1, 0); /* packet_rate_restriction_flag */ |
| 181 | put_bits(&pb, 7, 0x7f); /* reserved byte */ |
| 182 | } else |
| 183 | put_bits(&pb, 8, 0xff); /* reserved byte */ |
| 184 | |
| 185 | /* DVD-Video Stream_bound entries |
| 186 | * id (0xB9) video, maximum P-STD for stream 0xE0. (P-STD_buffer_bound_scale = 1) |
| 187 | * id (0xB8) audio, maximum P-STD for any MPEG audio (0xC0 to 0xC7) streams. If there are none set to 4096 (32x128). (P-STD_buffer_bound_scale = 0) |
| 188 | * id (0xBD) private stream 1 (audio other than MPEG and subpictures). (P-STD_buffer_bound_scale = 1) |
| 189 | * id (0xBF) private stream 2, NAV packs, set to 2x1024. */ |
| 190 | if (s->is_dvd) { |
| 191 | |
| 192 | int P_STD_max_video = 0; |
| 193 | int P_STD_max_mpeg_audio = 0; |
| 194 | int P_STD_max_mpeg_PS1 = 0; |
| 195 | |
| 196 | for (i = 0; i < ctx->nb_streams; i++) { |
| 197 | StreamInfo *stream = ctx->streams[i]->priv_data; |
| 198 | |
| 199 | id = stream->id; |
| 200 | if (id == 0xbd && stream->max_buffer_size > P_STD_max_mpeg_PS1) { |
| 201 | P_STD_max_mpeg_PS1 = stream->max_buffer_size; |
| 202 | } else if (id >= 0xc0 && id <= 0xc7 && |
| 203 | stream->max_buffer_size > P_STD_max_mpeg_audio) { |
| 204 | P_STD_max_mpeg_audio = stream->max_buffer_size; |
| 205 | } else if (id == 0xe0 && |
| 206 | stream->max_buffer_size > P_STD_max_video) { |
| 207 | P_STD_max_video = stream->max_buffer_size; |
| 208 | } |
| 209 | } |
| 210 | |
| 211 | /* video */ |
| 212 | put_bits(&pb, 8, 0xb9); /* stream ID */ |
| 213 | put_bits(&pb, 2, 3); |
| 214 | put_bits(&pb, 1, 1); |
| 215 | put_bits(&pb, 13, P_STD_max_video / 1024); |
| 216 | |
| 217 | /* audio */ |
| 218 | if (P_STD_max_mpeg_audio == 0) |
| 219 | P_STD_max_mpeg_audio = 4096; |
| 220 | put_bits(&pb, 8, 0xb8); /* stream ID */ |
| 221 | put_bits(&pb, 2, 3); |
| 222 | put_bits(&pb, 1, 0); |
| 223 | put_bits(&pb, 13, P_STD_max_mpeg_audio / 128); |
| 224 | |
| 225 | /* private stream 1 */ |
| 226 | put_bits(&pb, 8, 0xbd); /* stream ID */ |
| 227 | put_bits(&pb, 2, 3); |
| 228 | put_bits(&pb, 1, 0); |
| 229 | put_bits(&pb, 13, P_STD_max_mpeg_PS1 / 128); |
| 230 | |
| 231 | /* private stream 2 */ |
| 232 | put_bits(&pb, 8, 0xbf); /* stream ID */ |
| 233 | put_bits(&pb, 2, 3); |
| 234 | put_bits(&pb, 1, 1); |
| 235 | put_bits(&pb, 13, 2); |
| 236 | } else { |
| 237 | /* audio stream info */ |
| 238 | private_stream_coded = 0; |
| 239 | for (i = 0; i < ctx->nb_streams; i++) { |
| 240 | StreamInfo *stream = ctx->streams[i]->priv_data; |
| 241 | |
| 242 | /* For VCDs, only include the stream info for the stream |
| 243 | * that the pack which contains this system belongs to. |
| 244 | * (see VCD standard p. IV-7) */ |
| 245 | if (!s->is_vcd || stream->id == only_for_stream_id || |
| 246 | only_for_stream_id == 0) { |
| 247 | id = stream->id; |
| 248 | if (id < 0xc0) { |
| 249 | /* special case for private streams (AC-3 uses that) */ |
| 250 | if (private_stream_coded) |
| 251 | continue; |
| 252 | private_stream_coded = 1; |
| 253 | id = 0xbd; |
| 254 | } |
| 255 | put_bits(&pb, 8, id); /* stream ID */ |
| 256 | put_bits(&pb, 2, 3); |
| 257 | if (id < 0xe0) { |
| 258 | /* audio */ |
| 259 | put_bits(&pb, 1, 0); |
| 260 | put_bits(&pb, 13, stream->max_buffer_size / 128); |
| 261 | } else { |
| 262 | /* video */ |
| 263 | put_bits(&pb, 1, 1); |
| 264 | put_bits(&pb, 13, stream->max_buffer_size / 1024); |
| 265 | } |
| 266 | } |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | flush_put_bits(&pb); |
| 271 | size = put_bits_ptr(&pb) - pb.buf; |
| 272 | /* patch packet size */ |
| 273 | AV_WB16(buf + 4, size - 6); |
| 274 | |
| 275 | return size; |
| 276 | } |
| 277 | |
| 278 | static int get_system_header_size(AVFormatContext *ctx) |
| 279 | { |
| 280 | int buf_index, i, private_stream_coded; |
| 281 | StreamInfo *stream; |
| 282 | MpegMuxContext *s = ctx->priv_data; |
| 283 | |
| 284 | if (s->is_dvd) |
| 285 | return 18; // DVD-Video system headers are 18 bytes fixed length. |
| 286 | |
| 287 | buf_index = 12; |
| 288 | private_stream_coded = 0; |
| 289 | for (i = 0; i < ctx->nb_streams; i++) { |
| 290 | stream = ctx->streams[i]->priv_data; |
| 291 | if (stream->id < 0xc0) { |
| 292 | if (private_stream_coded) |
| 293 | continue; |
| 294 | private_stream_coded = 1; |
| 295 | } |
| 296 | buf_index += 3; |
| 297 | } |
| 298 | return buf_index; |
| 299 | } |
| 300 | |
| 301 | static av_cold int mpeg_mux_init(AVFormatContext *ctx) |
| 302 | { |
| 303 | MpegMuxContext *s = ctx->priv_data; |
| 304 | int bitrate, i, mpa_id, mpv_id, h264_id, mps_id, ac3_id, dts_id, lpcm_id, j; |
| 305 | AVStream *st; |
| 306 | StreamInfo *stream; |
| 307 | int audio_bitrate; |
| 308 | int video_bitrate; |
| 309 | |
| 310 | s->packet_number = 0; |
| 311 | s->is_vcd = (CONFIG_MPEG1VCD_MUXER && ctx->oformat == &ff_mpeg1vcd_muxer); |
| 312 | s->is_svcd = (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer); |
| 313 | s->is_mpeg2 = ((CONFIG_MPEG2VOB_MUXER && ctx->oformat == &ff_mpeg2vob_muxer) || |
| 314 | (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer) || |
| 315 | (CONFIG_MPEG2SVCD_MUXER && ctx->oformat == &ff_mpeg2svcd_muxer)); |
| 316 | s->is_dvd = (CONFIG_MPEG2DVD_MUXER && ctx->oformat == &ff_mpeg2dvd_muxer); |
| 317 | |
| 318 | if (ctx->packet_size) { |
| 319 | if (ctx->packet_size < 20 || ctx->packet_size > (1 << 23) + 10) { |
| 320 | av_log(ctx, AV_LOG_ERROR, "Invalid packet size %d\n", |
| 321 | ctx->packet_size); |
| 322 | goto fail; |
| 323 | } |
| 324 | s->packet_size = ctx->packet_size; |
| 325 | } else |
| 326 | s->packet_size = 2048; |
| 327 | if (ctx->max_delay < 0) /* Not set by the caller */ |
| 328 | ctx->max_delay = 0.7*AV_TIME_BASE; |
| 329 | |
| 330 | s->vcd_padding_bytes_written = 0; |
| 331 | s->vcd_padding_bitrate = 0; |
| 332 | |
| 333 | s->audio_bound = 0; |
| 334 | s->video_bound = 0; |
| 335 | |
| 336 | mpa_id = AUDIO_ID; |
| 337 | ac3_id = AC3_ID; |
| 338 | dts_id = DTS_ID; |
| 339 | mpv_id = VIDEO_ID; |
| 340 | h264_id = H264_ID; |
| 341 | mps_id = SUB_ID; |
| 342 | lpcm_id = LPCM_ID; |
| 343 | |
| 344 | for (i = 0; i < ctx->nb_streams; i++) { |
| 345 | st = ctx->streams[i]; |
| 346 | stream = av_mallocz(sizeof(StreamInfo)); |
| 347 | if (!stream) |
| 348 | goto fail; |
| 349 | st->priv_data = stream; |
| 350 | |
| 351 | avpriv_set_pts_info(st, 64, 1, 90000); |
| 352 | |
| 353 | switch (st->codec->codec_type) { |
| 354 | case AVMEDIA_TYPE_AUDIO: |
| 355 | if (!s->is_mpeg2 && |
| 356 | (st->codec->codec_id == AV_CODEC_ID_AC3 || |
| 357 | st->codec->codec_id == AV_CODEC_ID_DTS || |
| 358 | st->codec->codec_id == AV_CODEC_ID_PCM_S16BE)) |
| 359 | av_log(ctx, AV_LOG_WARNING, |
| 360 | "%s in MPEG-1 system streams is not widely supported, " |
| 361 | "consider using the vob or the dvd muxer " |
| 362 | "to force a MPEG-2 program stream.\n", |
| 363 | avcodec_get_name(st->codec->codec_id)); |
| 364 | if (st->codec->codec_id == AV_CODEC_ID_AC3) { |
| 365 | stream->id = ac3_id++; |
| 366 | } else if (st->codec->codec_id == AV_CODEC_ID_DTS) { |
| 367 | stream->id = dts_id++; |
| 368 | } else if (st->codec->codec_id == AV_CODEC_ID_PCM_S16BE) { |
| 369 | stream->id = lpcm_id++; |
| 370 | for (j = 0; j < 4; j++) { |
| 371 | if (lpcm_freq_tab[j] == st->codec->sample_rate) |
| 372 | break; |
| 373 | } |
| 374 | if (j == 4) |
| 375 | goto fail; |
| 376 | if (st->codec->channels > 8) |
| 377 | return -1; |
| 378 | stream->lpcm_header[0] = 0x0c; |
| 379 | stream->lpcm_header[1] = (st->codec->channels - 1) | (j << 4); |
| 380 | stream->lpcm_header[2] = 0x80; |
| 381 | stream->lpcm_align = st->codec->channels * 2; |
| 382 | } else { |
| 383 | stream->id = mpa_id++; |
| 384 | } |
| 385 | |
| 386 | /* This value HAS to be used for VCD (see VCD standard, p. IV-7). |
| 387 | * Right now it is also used for everything else. */ |
| 388 | stream->max_buffer_size = 4 * 1024; |
| 389 | s->audio_bound++; |
| 390 | break; |
| 391 | case AVMEDIA_TYPE_VIDEO: |
| 392 | if (st->codec->codec_id == AV_CODEC_ID_H264) |
| 393 | stream->id = h264_id++; |
| 394 | else |
| 395 | stream->id = mpv_id++; |
| 396 | if (st->codec->rc_buffer_size) |
| 397 | stream->max_buffer_size = 6 * 1024 + st->codec->rc_buffer_size / 8; |
| 398 | else { |
| 399 | av_log(ctx, AV_LOG_WARNING, |
| 400 | "VBV buffer size not set, using default size of 130KB\n" |
| 401 | "If you want the mpeg file to be compliant to some specification\n" |
| 402 | "Like DVD, VCD or others, make sure you set the correct buffer size\n"); |
| 403 | // FIXME: this is probably too small as default |
| 404 | stream->max_buffer_size = 230 * 1024; |
| 405 | } |
| 406 | if (stream->max_buffer_size > 1024 * 8191) { |
| 407 | av_log(ctx, AV_LOG_WARNING, "buffer size %d, too large\n", stream->max_buffer_size); |
| 408 | stream->max_buffer_size = 1024 * 8191; |
| 409 | } |
| 410 | s->video_bound++; |
| 411 | break; |
| 412 | case AVMEDIA_TYPE_SUBTITLE: |
| 413 | stream->id = mps_id++; |
| 414 | stream->max_buffer_size = 16 * 1024; |
| 415 | break; |
| 416 | default: |
| 417 | return -1; |
| 418 | } |
| 419 | stream->fifo = av_fifo_alloc(16); |
| 420 | if (!stream->fifo) |
| 421 | goto fail; |
| 422 | } |
| 423 | bitrate = 0; |
| 424 | audio_bitrate = 0; |
| 425 | video_bitrate = 0; |
| 426 | for (i = 0; i < ctx->nb_streams; i++) { |
| 427 | int codec_rate; |
| 428 | st = ctx->streams[i]; |
| 429 | stream = (StreamInfo *)st->priv_data; |
| 430 | |
| 431 | if (st->codec->rc_max_rate || |
| 432 | st->codec->codec_type == AVMEDIA_TYPE_VIDEO) |
| 433 | codec_rate = st->codec->rc_max_rate; |
| 434 | else |
| 435 | codec_rate = st->codec->bit_rate; |
| 436 | |
| 437 | if (!codec_rate) |
| 438 | codec_rate = (1 << 21) * 8 * 50 / ctx->nb_streams; |
| 439 | |
| 440 | bitrate += codec_rate; |
| 441 | |
| 442 | if ((stream->id & 0xe0) == AUDIO_ID) |
| 443 | audio_bitrate += codec_rate; |
| 444 | else if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) |
| 445 | video_bitrate += codec_rate; |
| 446 | } |
| 447 | |
| 448 | if (s->user_mux_rate) { |
| 449 | s->mux_rate = (s->user_mux_rate + (8 * 50) - 1) / (8 * 50); |
| 450 | } else { |
| 451 | /* we increase slightly the bitrate to take into account the |
| 452 | * headers. XXX: compute it exactly */ |
| 453 | bitrate += bitrate / 20; |
| 454 | bitrate += 10000; |
| 455 | s->mux_rate = (bitrate + (8 * 50) - 1) / (8 * 50); |
| 456 | if (s->mux_rate >= (1<<22)) { |
| 457 | av_log(ctx, AV_LOG_WARNING, "mux rate %d is too large\n", s->mux_rate); |
| 458 | s->mux_rate = (1<<22) - 1; |
| 459 | } |
| 460 | } |
| 461 | |
| 462 | if (s->is_vcd) { |
| 463 | double overhead_rate; |
| 464 | |
| 465 | /* The VCD standard mandates that the mux_rate field is 3528 |
| 466 | * (see standard p. IV-6). |
| 467 | * The value is actually "wrong", i.e. if you calculate |
| 468 | * it using the normal formula and the 75 sectors per second transfer |
| 469 | * rate you get a different value because the real pack size is 2324, |
| 470 | * not 2352. But the standard explicitly specifies that the mux_rate |
| 471 | * field in the header must have this value. */ |
| 472 | // s->mux_rate = 2352 * 75 / 50; /* = 3528 */ |
| 473 | |
| 474 | /* The VCD standard states that the muxed stream must be |
| 475 | * exactly 75 packs / second (the data rate of a single speed cdrom). |
| 476 | * Since the video bitrate (probably 1150000 bits/sec) will be below |
| 477 | * the theoretical maximum we have to add some padding packets |
| 478 | * to make up for the lower data rate. |
| 479 | * (cf. VCD standard p. IV-6 ) */ |
| 480 | |
| 481 | /* Add the header overhead to the data rate. |
| 482 | * 2279 data bytes per audio pack, 2294 data bytes per video pack */ |
| 483 | overhead_rate = ((audio_bitrate / 8.0) / 2279) * (2324 - 2279); |
| 484 | overhead_rate += ((video_bitrate / 8.0) / 2294) * (2324 - 2294); |
| 485 | overhead_rate *= 8; |
| 486 | |
| 487 | /* Add padding so that the full bitrate is 2324*75 bytes/sec */ |
| 488 | s->vcd_padding_bitrate = 2324 * 75 * 8 - (bitrate + overhead_rate); |
| 489 | } |
| 490 | |
| 491 | if (s->is_vcd || s->is_mpeg2) |
| 492 | /* every packet */ |
| 493 | s->pack_header_freq = 1; |
| 494 | else |
| 495 | /* every 2 seconds */ |
| 496 | s->pack_header_freq = 2 * bitrate / s->packet_size / 8; |
| 497 | |
| 498 | /* the above seems to make pack_header_freq zero sometimes */ |
| 499 | if (s->pack_header_freq == 0) |
| 500 | s->pack_header_freq = 1; |
| 501 | |
| 502 | if (s->is_mpeg2) |
| 503 | /* every 200 packets. Need to look at the spec. */ |
| 504 | s->system_header_freq = s->pack_header_freq * 40; |
| 505 | else if (s->is_vcd) |
| 506 | /* the standard mandates that there are only two system headers |
| 507 | * in the whole file: one in the first packet of each stream. |
| 508 | * (see standard p. IV-7 and IV-8) */ |
| 509 | s->system_header_freq = 0x7fffffff; |
| 510 | else |
| 511 | s->system_header_freq = s->pack_header_freq * 5; |
| 512 | |
| 513 | for (i = 0; i < ctx->nb_streams; i++) { |
| 514 | stream = ctx->streams[i]->priv_data; |
| 515 | stream->packet_number = 0; |
| 516 | } |
| 517 | s->system_header_size = get_system_header_size(ctx); |
| 518 | s->last_scr = AV_NOPTS_VALUE; |
| 519 | return 0; |
| 520 | |
| 521 | fail: |
| 522 | for (i = 0; i < ctx->nb_streams; i++) |
| 523 | av_free(ctx->streams[i]->priv_data); |
| 524 | return AVERROR(ENOMEM); |
| 525 | } |
| 526 | |
| 527 | static inline void put_timestamp(AVIOContext *pb, int id, int64_t timestamp) |
| 528 | { |
| 529 | avio_w8(pb, (id << 4) | (((timestamp >> 30) & 0x07) << 1) | 1); |
| 530 | avio_wb16(pb, (uint16_t)((((timestamp >> 15) & 0x7fff) << 1) | 1)); |
| 531 | avio_wb16(pb, (uint16_t)((((timestamp) & 0x7fff) << 1) | 1)); |
| 532 | } |
| 533 | |
| 534 | /* return the number of padding bytes that should be inserted into |
| 535 | * the multiplexed stream. */ |
| 536 | static int get_vcd_padding_size(AVFormatContext *ctx, int64_t pts) |
| 537 | { |
| 538 | MpegMuxContext *s = ctx->priv_data; |
| 539 | int pad_bytes = 0; |
| 540 | |
| 541 | if (s->vcd_padding_bitrate > 0 && pts != AV_NOPTS_VALUE) { |
| 542 | int64_t full_pad_bytes; |
| 543 | |
| 544 | // FIXME: this is wrong |
| 545 | full_pad_bytes = |
| 546 | (int64_t)((s->vcd_padding_bitrate * (pts / 90000.0)) / 8.0); |
| 547 | pad_bytes = (int)(full_pad_bytes - s->vcd_padding_bytes_written); |
| 548 | |
| 549 | if (pad_bytes < 0) |
| 550 | /* might happen if we have already padded to a later timestamp. This |
| 551 | * can occur if another stream has already advanced further. */ |
| 552 | pad_bytes = 0; |
| 553 | } |
| 554 | |
| 555 | return pad_bytes; |
| 556 | } |
| 557 | |
| 558 | /* Write an MPEG padding packet header. */ |
| 559 | static void put_padding_packet(AVFormatContext *ctx, AVIOContext *pb, |
| 560 | int packet_bytes) |
| 561 | { |
| 562 | MpegMuxContext *s = ctx->priv_data; |
| 563 | int i; |
| 564 | |
| 565 | avio_wb32(pb, PADDING_STREAM); |
| 566 | avio_wb16(pb, packet_bytes - 6); |
| 567 | if (!s->is_mpeg2) { |
| 568 | avio_w8(pb, 0x0f); |
| 569 | packet_bytes -= 7; |
| 570 | } else |
| 571 | packet_bytes -= 6; |
| 572 | |
| 573 | for (i = 0; i < packet_bytes; i++) |
| 574 | avio_w8(pb, 0xff); |
| 575 | } |
| 576 | |
| 577 | static int get_nb_frames(AVFormatContext *ctx, StreamInfo *stream, int len) |
| 578 | { |
| 579 | int nb_frames = 0; |
| 580 | PacketDesc *pkt_desc = stream->premux_packet; |
| 581 | |
| 582 | while (len > 0) { |
| 583 | if (pkt_desc->size == pkt_desc->unwritten_size) |
| 584 | nb_frames++; |
| 585 | len -= pkt_desc->unwritten_size; |
| 586 | pkt_desc = pkt_desc->next; |
| 587 | } |
| 588 | |
| 589 | return nb_frames; |
| 590 | } |
| 591 | |
| 592 | /* flush the packet on stream stream_index */ |
| 593 | static int flush_packet(AVFormatContext *ctx, int stream_index, |
| 594 | int64_t pts, int64_t dts, int64_t scr, int trailer_size) |
| 595 | { |
| 596 | MpegMuxContext *s = ctx->priv_data; |
| 597 | StreamInfo *stream = ctx->streams[stream_index]->priv_data; |
| 598 | uint8_t *buf_ptr; |
| 599 | int size, payload_size, startcode, id, stuffing_size, i, header_len; |
| 600 | int packet_size; |
| 601 | uint8_t buffer[128]; |
| 602 | int zero_trail_bytes = 0; |
| 603 | int pad_packet_bytes = 0; |
| 604 | int pes_flags; |
| 605 | /* "general" pack without data specific to one stream? */ |
| 606 | int general_pack = 0; |
| 607 | int nb_frames; |
| 608 | |
| 609 | id = stream->id; |
| 610 | |
| 611 | av_dlog(ctx, "packet ID=%2x PTS=%0.3f\n", id, pts / 90000.0); |
| 612 | |
| 613 | buf_ptr = buffer; |
| 614 | |
| 615 | if ((s->packet_number % s->pack_header_freq) == 0 || s->last_scr != scr) { |
| 616 | /* output pack and systems header if needed */ |
| 617 | size = put_pack_header(ctx, buf_ptr, scr); |
| 618 | buf_ptr += size; |
| 619 | s->last_scr = scr; |
| 620 | |
| 621 | if (s->is_vcd) { |
| 622 | /* there is exactly one system header for each stream in a VCD MPEG, |
| 623 | * One in the very first video packet and one in the very first |
| 624 | * audio packet (see VCD standard p. IV-7 and IV-8). */ |
| 625 | |
| 626 | if (stream->packet_number == 0) { |
| 627 | size = put_system_header(ctx, buf_ptr, id); |
| 628 | buf_ptr += size; |
| 629 | } |
| 630 | } else if (s->is_dvd) { |
| 631 | if (stream->align_iframe || s->packet_number == 0) { |
| 632 | int PES_bytes_to_fill = s->packet_size - size - 10; |
| 633 | |
| 634 | if (pts != AV_NOPTS_VALUE) { |
| 635 | if (dts != pts) |
| 636 | PES_bytes_to_fill -= 5 + 5; |
| 637 | else |
| 638 | PES_bytes_to_fill -= 5; |
| 639 | } |
| 640 | |
| 641 | if (stream->bytes_to_iframe == 0 || s->packet_number == 0) { |
| 642 | size = put_system_header(ctx, buf_ptr, 0); |
| 643 | buf_ptr += size; |
| 644 | size = buf_ptr - buffer; |
| 645 | avio_write(ctx->pb, buffer, size); |
| 646 | |
| 647 | avio_wb32(ctx->pb, PRIVATE_STREAM_2); |
| 648 | avio_wb16(ctx->pb, 0x03d4); // length |
| 649 | avio_w8(ctx->pb, 0x00); // substream ID, 00=PCI |
| 650 | for (i = 0; i < 979; i++) |
| 651 | avio_w8(ctx->pb, 0x00); |
| 652 | |
| 653 | avio_wb32(ctx->pb, PRIVATE_STREAM_2); |
| 654 | avio_wb16(ctx->pb, 0x03fa); // length |
| 655 | avio_w8(ctx->pb, 0x01); // substream ID, 01=DSI |
| 656 | for (i = 0; i < 1017; i++) |
| 657 | avio_w8(ctx->pb, 0x00); |
| 658 | |
| 659 | memset(buffer, 0, 128); |
| 660 | buf_ptr = buffer; |
| 661 | s->packet_number++; |
| 662 | stream->align_iframe = 0; |
| 663 | // FIXME: rounding and first few bytes of each packet |
| 664 | scr += s->packet_size * 90000LL / |
| 665 | (s->mux_rate * 50LL); |
| 666 | size = put_pack_header(ctx, buf_ptr, scr); |
| 667 | s->last_scr = scr; |
| 668 | buf_ptr += size; |
| 669 | /* GOP Start */ |
| 670 | } else if (stream->bytes_to_iframe < PES_bytes_to_fill) { |
| 671 | pad_packet_bytes = PES_bytes_to_fill - |
| 672 | stream->bytes_to_iframe; |
| 673 | } |
| 674 | } |
| 675 | } else { |
| 676 | if ((s->packet_number % s->system_header_freq) == 0) { |
| 677 | size = put_system_header(ctx, buf_ptr, 0); |
| 678 | buf_ptr += size; |
| 679 | } |
| 680 | } |
| 681 | } |
| 682 | size = buf_ptr - buffer; |
| 683 | avio_write(ctx->pb, buffer, size); |
| 684 | |
| 685 | packet_size = s->packet_size - size; |
| 686 | |
| 687 | if (s->is_vcd && (id & 0xe0) == AUDIO_ID) |
| 688 | /* The VCD standard demands that 20 zero bytes follow |
| 689 | * each audio pack (see standard p. IV-8). */ |
| 690 | zero_trail_bytes += 20; |
| 691 | |
| 692 | if ((s->is_vcd && stream->packet_number == 0) || |
| 693 | (s->is_svcd && s->packet_number == 0)) { |
| 694 | /* for VCD the first pack of each stream contains only the pack header, |
| 695 | * the system header and lots of padding (see VCD standard p. IV-6). |
| 696 | * In the case of an audio pack, 20 zero bytes are also added at |
| 697 | * the end. */ |
| 698 | /* For SVCD we fill the very first pack to increase compatibility with |
| 699 | * some DVD players. Not mandated by the standard. */ |
| 700 | if (s->is_svcd) |
| 701 | /* the system header refers to both streams and no stream data */ |
| 702 | general_pack = 1; |
| 703 | pad_packet_bytes = packet_size - zero_trail_bytes; |
| 704 | } |
| 705 | |
| 706 | packet_size -= pad_packet_bytes + zero_trail_bytes; |
| 707 | |
| 708 | if (packet_size > 0) { |
| 709 | /* packet header size */ |
| 710 | packet_size -= 6; |
| 711 | |
| 712 | /* packet header */ |
| 713 | if (s->is_mpeg2) { |
| 714 | header_len = 3; |
| 715 | if (stream->packet_number == 0) |
| 716 | header_len += 3; /* PES extension */ |
| 717 | header_len += 1; /* obligatory stuffing byte */ |
| 718 | } else { |
| 719 | header_len = 0; |
| 720 | } |
| 721 | if (pts != AV_NOPTS_VALUE) { |
| 722 | if (dts != pts) |
| 723 | header_len += 5 + 5; |
| 724 | else |
| 725 | header_len += 5; |
| 726 | } else { |
| 727 | if (!s->is_mpeg2) |
| 728 | header_len++; |
| 729 | } |
| 730 | |
| 731 | payload_size = packet_size - header_len; |
| 732 | if (id < 0xc0) { |
| 733 | startcode = PRIVATE_STREAM_1; |
| 734 | payload_size -= 1; |
| 735 | if (id >= 0x40) { |
| 736 | payload_size -= 3; |
| 737 | if (id >= 0xa0) |
| 738 | payload_size -= 3; |
| 739 | } |
| 740 | } else { |
| 741 | startcode = 0x100 + id; |
| 742 | } |
| 743 | |
| 744 | stuffing_size = payload_size - av_fifo_size(stream->fifo); |
| 745 | |
| 746 | // first byte does not fit -> reset pts/dts + stuffing |
| 747 | if (payload_size <= trailer_size && pts != AV_NOPTS_VALUE) { |
| 748 | int timestamp_len = 0; |
| 749 | if (dts != pts) |
| 750 | timestamp_len += 5; |
| 751 | if (pts != AV_NOPTS_VALUE) |
| 752 | timestamp_len += s->is_mpeg2 ? 5 : 4; |
| 753 | pts = |
| 754 | dts = AV_NOPTS_VALUE; |
| 755 | header_len -= timestamp_len; |
| 756 | if (s->is_dvd && stream->align_iframe) { |
| 757 | pad_packet_bytes += timestamp_len; |
| 758 | packet_size -= timestamp_len; |
| 759 | } else { |
| 760 | payload_size += timestamp_len; |
| 761 | } |
| 762 | stuffing_size += timestamp_len; |
| 763 | if (payload_size > trailer_size) |
| 764 | stuffing_size += payload_size - trailer_size; |
| 765 | } |
| 766 | |
| 767 | // can't use padding, so use stuffing |
| 768 | if (pad_packet_bytes > 0 && pad_packet_bytes <= 7) { |
| 769 | packet_size += pad_packet_bytes; |
| 770 | payload_size += pad_packet_bytes; // undo the previous adjustment |
| 771 | if (stuffing_size < 0) |
| 772 | stuffing_size = pad_packet_bytes; |
| 773 | else |
| 774 | stuffing_size += pad_packet_bytes; |
| 775 | pad_packet_bytes = 0; |
| 776 | } |
| 777 | |
| 778 | if (stuffing_size < 0) |
| 779 | stuffing_size = 0; |
| 780 | |
| 781 | if (startcode == PRIVATE_STREAM_1 && id >= 0xa0) { |
| 782 | if (payload_size < av_fifo_size(stream->fifo)) |
| 783 | stuffing_size += payload_size % stream->lpcm_align; |
| 784 | } |
| 785 | |
| 786 | if (stuffing_size > 16) { /* <=16 for MPEG-1, <=32 for MPEG-2 */ |
| 787 | pad_packet_bytes += stuffing_size; |
| 788 | packet_size -= stuffing_size; |
| 789 | payload_size -= stuffing_size; |
| 790 | stuffing_size = 0; |
| 791 | } |
| 792 | |
| 793 | nb_frames = get_nb_frames(ctx, stream, payload_size - stuffing_size); |
| 794 | |
| 795 | avio_wb32(ctx->pb, startcode); |
| 796 | |
| 797 | avio_wb16(ctx->pb, packet_size); |
| 798 | |
| 799 | if (!s->is_mpeg2) |
| 800 | for (i = 0; i < stuffing_size; i++) |
| 801 | avio_w8(ctx->pb, 0xff); |
| 802 | |
| 803 | if (s->is_mpeg2) { |
| 804 | avio_w8(ctx->pb, 0x80); /* mpeg2 id */ |
| 805 | |
| 806 | pes_flags = 0; |
| 807 | |
| 808 | if (pts != AV_NOPTS_VALUE) { |
| 809 | pes_flags |= 0x80; |
| 810 | if (dts != pts) |
| 811 | pes_flags |= 0x40; |
| 812 | } |
| 813 | |
| 814 | /* Both the MPEG-2 and the SVCD standards demand that the |
| 815 | * P-STD_buffer_size field be included in the first packet of |
| 816 | * every stream. (see SVCD standard p. 26 V.2.3.1 and V.2.3.2 |
| 817 | * and MPEG-2 standard 2.7.7) */ |
| 818 | if (stream->packet_number == 0) |
| 819 | pes_flags |= 0x01; |
| 820 | |
| 821 | avio_w8(ctx->pb, pes_flags); /* flags */ |
| 822 | avio_w8(ctx->pb, header_len - 3 + stuffing_size); |
| 823 | |
| 824 | if (pes_flags & 0x80) /* write pts */ |
| 825 | put_timestamp(ctx->pb, (pes_flags & 0x40) ? 0x03 : 0x02, pts); |
| 826 | if (pes_flags & 0x40) /* write dts */ |
| 827 | put_timestamp(ctx->pb, 0x01, dts); |
| 828 | |
| 829 | if (pes_flags & 0x01) { /* write pes extension */ |
| 830 | avio_w8(ctx->pb, 0x10); /* flags */ |
| 831 | |
| 832 | /* P-STD buffer info */ |
| 833 | if ((id & 0xe0) == AUDIO_ID) |
| 834 | avio_wb16(ctx->pb, 0x4000 | stream->max_buffer_size / 128); |
| 835 | else |
| 836 | avio_wb16(ctx->pb, 0x6000 | stream->max_buffer_size / 1024); |
| 837 | } |
| 838 | } else { |
| 839 | if (pts != AV_NOPTS_VALUE) { |
| 840 | if (dts != pts) { |
| 841 | put_timestamp(ctx->pb, 0x03, pts); |
| 842 | put_timestamp(ctx->pb, 0x01, dts); |
| 843 | } else { |
| 844 | put_timestamp(ctx->pb, 0x02, pts); |
| 845 | } |
| 846 | } else { |
| 847 | avio_w8(ctx->pb, 0x0f); |
| 848 | } |
| 849 | } |
| 850 | |
| 851 | if (s->is_mpeg2) { |
| 852 | /* special stuffing byte that is always written |
| 853 | * to prevent accidental generation of start codes. */ |
| 854 | avio_w8(ctx->pb, 0xff); |
| 855 | |
| 856 | for (i = 0; i < stuffing_size; i++) |
| 857 | avio_w8(ctx->pb, 0xff); |
| 858 | } |
| 859 | |
| 860 | if (startcode == PRIVATE_STREAM_1) { |
| 861 | avio_w8(ctx->pb, id); |
| 862 | if (id >= 0xa0) { |
| 863 | /* LPCM (XXX: check nb_frames) */ |
| 864 | avio_w8(ctx->pb, 7); |
| 865 | avio_wb16(ctx->pb, 4); /* skip 3 header bytes */ |
| 866 | avio_w8(ctx->pb, stream->lpcm_header[0]); |
| 867 | avio_w8(ctx->pb, stream->lpcm_header[1]); |
| 868 | avio_w8(ctx->pb, stream->lpcm_header[2]); |
| 869 | } else if (id >= 0x40) { |
| 870 | /* AC-3 */ |
| 871 | avio_w8(ctx->pb, nb_frames); |
| 872 | avio_wb16(ctx->pb, trailer_size + 1); |
| 873 | } |
| 874 | } |
| 875 | |
| 876 | /* output data */ |
| 877 | assert(payload_size - stuffing_size <= av_fifo_size(stream->fifo)); |
| 878 | av_fifo_generic_read(stream->fifo, ctx->pb, |
| 879 | payload_size - stuffing_size, |
| 880 | (void (*)(void*, void*, int))avio_write); |
| 881 | stream->bytes_to_iframe -= payload_size - stuffing_size; |
| 882 | } else { |
| 883 | payload_size = |
| 884 | stuffing_size = 0; |
| 885 | } |
| 886 | |
| 887 | if (pad_packet_bytes > 0) |
| 888 | put_padding_packet(ctx, ctx->pb, pad_packet_bytes); |
| 889 | |
| 890 | for (i = 0; i < zero_trail_bytes; i++) |
| 891 | avio_w8(ctx->pb, 0x00); |
| 892 | |
| 893 | avio_flush(ctx->pb); |
| 894 | |
| 895 | s->packet_number++; |
| 896 | |
| 897 | /* only increase the stream packet number if this pack actually contains |
| 898 | * something that is specific to this stream! I.e. a dedicated header |
| 899 | * or some data. */ |
| 900 | if (!general_pack) |
| 901 | stream->packet_number++; |
| 902 | |
| 903 | return payload_size - stuffing_size; |
| 904 | } |
| 905 | |
| 906 | static void put_vcd_padding_sector(AVFormatContext *ctx) |
| 907 | { |
| 908 | /* There are two ways to do this padding: writing a sector/pack |
| 909 | * of 0 values, or writing an MPEG padding pack. Both seem to |
| 910 | * work with most decoders, BUT the VCD standard only allows a 0-sector |
| 911 | * (see standard p. IV-4, IV-5). |
| 912 | * So a 0-sector it is... */ |
| 913 | |
| 914 | MpegMuxContext *s = ctx->priv_data; |
| 915 | int i; |
| 916 | |
| 917 | for (i = 0; i < s->packet_size; i++) |
| 918 | avio_w8(ctx->pb, 0); |
| 919 | |
| 920 | s->vcd_padding_bytes_written += s->packet_size; |
| 921 | |
| 922 | avio_flush(ctx->pb); |
| 923 | |
| 924 | /* increasing the packet number is correct. The SCR of the following packs |
| 925 | * is calculated from the packet_number and it has to include the padding |
| 926 | * sector (it represents the sector index, not the MPEG pack index) |
| 927 | * (see VCD standard p. IV-6) */ |
| 928 | s->packet_number++; |
| 929 | } |
| 930 | |
| 931 | static int remove_decoded_packets(AVFormatContext *ctx, int64_t scr) |
| 932 | { |
| 933 | int i; |
| 934 | |
| 935 | for (i = 0; i < ctx->nb_streams; i++) { |
| 936 | AVStream *st = ctx->streams[i]; |
| 937 | StreamInfo *stream = st->priv_data; |
| 938 | PacketDesc *pkt_desc; |
| 939 | |
| 940 | while ((pkt_desc = stream->predecode_packet) && |
| 941 | scr > pkt_desc->dts) { // FIXME: > vs >= |
| 942 | if (stream->buffer_index < pkt_desc->size || |
| 943 | stream->predecode_packet == stream->premux_packet) { |
| 944 | av_log(ctx, AV_LOG_ERROR, |
| 945 | "buffer underflow st=%d bufi=%d size=%d\n", |
| 946 | i, stream->buffer_index, pkt_desc->size); |
| 947 | break; |
| 948 | } |
| 949 | stream->buffer_index -= pkt_desc->size; |
| 950 | stream->predecode_packet = pkt_desc->next; |
| 951 | av_freep(&pkt_desc); |
| 952 | } |
| 953 | } |
| 954 | |
| 955 | return 0; |
| 956 | } |
| 957 | |
| 958 | static int output_packet(AVFormatContext *ctx, int flush) |
| 959 | { |
| 960 | MpegMuxContext *s = ctx->priv_data; |
| 961 | AVStream *st; |
| 962 | StreamInfo *stream; |
| 963 | int i, avail_space = 0, es_size, trailer_size; |
| 964 | int best_i = -1; |
| 965 | int best_score = INT_MIN; |
| 966 | int ignore_constraints = 0; |
| 967 | int64_t scr = s->last_scr; |
| 968 | PacketDesc *timestamp_packet; |
| 969 | const int64_t max_delay = av_rescale(ctx->max_delay, 90000, AV_TIME_BASE); |
| 970 | |
| 971 | retry: |
| 972 | for (i = 0; i < ctx->nb_streams; i++) { |
| 973 | AVStream *st = ctx->streams[i]; |
| 974 | StreamInfo *stream = st->priv_data; |
| 975 | const int avail_data = av_fifo_size(stream->fifo); |
| 976 | const int space = stream->max_buffer_size - stream->buffer_index; |
| 977 | int rel_space = 1024LL * space / stream->max_buffer_size; |
| 978 | PacketDesc *next_pkt = stream->premux_packet; |
| 979 | |
| 980 | /* for subtitle, a single PES packet must be generated, |
| 981 | * so we flush after every single subtitle packet */ |
| 982 | if (s->packet_size > avail_data && !flush |
| 983 | && st->codec->codec_type != AVMEDIA_TYPE_SUBTITLE) |
| 984 | return 0; |
| 985 | if (avail_data == 0) |
| 986 | continue; |
| 987 | av_assert0(avail_data > 0); |
| 988 | |
| 989 | if (space < s->packet_size && !ignore_constraints) |
| 990 | continue; |
| 991 | |
| 992 | if (next_pkt && next_pkt->dts - scr > max_delay) |
| 993 | continue; |
| 994 | if ( stream->predecode_packet |
| 995 | && stream->predecode_packet->size > stream->buffer_index) |
| 996 | rel_space += 1<<28; |
| 997 | if (rel_space > best_score) { |
| 998 | best_score = rel_space; |
| 999 | best_i = i; |
| 1000 | avail_space = space; |
| 1001 | } |
| 1002 | } |
| 1003 | |
| 1004 | if (best_i < 0) { |
| 1005 | int64_t best_dts = INT64_MAX; |
| 1006 | |
| 1007 | for (i = 0; i < ctx->nb_streams; i++) { |
| 1008 | AVStream *st = ctx->streams[i]; |
| 1009 | StreamInfo *stream = st->priv_data; |
| 1010 | PacketDesc *pkt_desc = stream->predecode_packet; |
| 1011 | if (pkt_desc && pkt_desc->dts < best_dts) |
| 1012 | best_dts = pkt_desc->dts; |
| 1013 | } |
| 1014 | |
| 1015 | av_dlog(ctx, "bumping scr, scr:%f, dts:%f\n", |
| 1016 | scr / 90000.0, best_dts / 90000.0); |
| 1017 | if (best_dts == INT64_MAX) |
| 1018 | return 0; |
| 1019 | |
| 1020 | if (scr >= best_dts + 1 && !ignore_constraints) { |
| 1021 | av_log(ctx, AV_LOG_ERROR, |
| 1022 | "packet too large, ignoring buffer limits to mux it\n"); |
| 1023 | ignore_constraints = 1; |
| 1024 | } |
| 1025 | scr = FFMAX(best_dts + 1, scr); |
| 1026 | if (remove_decoded_packets(ctx, scr) < 0) |
| 1027 | return -1; |
| 1028 | goto retry; |
| 1029 | } |
| 1030 | |
| 1031 | assert(best_i >= 0); |
| 1032 | |
| 1033 | st = ctx->streams[best_i]; |
| 1034 | stream = st->priv_data; |
| 1035 | |
| 1036 | assert(av_fifo_size(stream->fifo) > 0); |
| 1037 | |
| 1038 | assert(avail_space >= s->packet_size || ignore_constraints); |
| 1039 | |
| 1040 | timestamp_packet = stream->premux_packet; |
| 1041 | if (timestamp_packet->unwritten_size == timestamp_packet->size) { |
| 1042 | trailer_size = 0; |
| 1043 | } else { |
| 1044 | trailer_size = timestamp_packet->unwritten_size; |
| 1045 | timestamp_packet = timestamp_packet->next; |
| 1046 | } |
| 1047 | |
| 1048 | if (timestamp_packet) { |
| 1049 | av_dlog(ctx, "dts:%f pts:%f scr:%f stream:%d\n", |
| 1050 | timestamp_packet->dts / 90000.0, |
| 1051 | timestamp_packet->pts / 90000.0, |
| 1052 | scr / 90000.0, best_i); |
| 1053 | es_size = flush_packet(ctx, best_i, timestamp_packet->pts, |
| 1054 | timestamp_packet->dts, scr, trailer_size); |
| 1055 | } else { |
| 1056 | assert(av_fifo_size(stream->fifo) == trailer_size); |
| 1057 | es_size = flush_packet(ctx, best_i, AV_NOPTS_VALUE, AV_NOPTS_VALUE, scr, |
| 1058 | trailer_size); |
| 1059 | } |
| 1060 | |
| 1061 | if (s->is_vcd) { |
| 1062 | /* Write one or more padding sectors, if necessary, to reach |
| 1063 | * the constant overall bitrate. */ |
| 1064 | int vcd_pad_bytes; |
| 1065 | |
| 1066 | // FIXME: pts cannot be correct here |
| 1067 | while ((vcd_pad_bytes = get_vcd_padding_size(ctx, stream->premux_packet->pts)) >= s->packet_size) { |
| 1068 | put_vcd_padding_sector(ctx); |
| 1069 | // FIXME: rounding and first few bytes of each packet |
| 1070 | s->last_scr += s->packet_size * 90000LL / (s->mux_rate * 50LL); |
| 1071 | } |
| 1072 | } |
| 1073 | |
| 1074 | stream->buffer_index += es_size; |
| 1075 | // FIXME: rounding and first few bytes of each packet |
| 1076 | s->last_scr += s->packet_size * 90000LL / (s->mux_rate * 50LL); |
| 1077 | |
| 1078 | while (stream->premux_packet && |
| 1079 | stream->premux_packet->unwritten_size <= es_size) { |
| 1080 | es_size -= stream->premux_packet->unwritten_size; |
| 1081 | stream->premux_packet = stream->premux_packet->next; |
| 1082 | } |
| 1083 | if (es_size) { |
| 1084 | av_assert0(stream->premux_packet); |
| 1085 | stream->premux_packet->unwritten_size -= es_size; |
| 1086 | } |
| 1087 | |
| 1088 | if (remove_decoded_packets(ctx, s->last_scr) < 0) |
| 1089 | return -1; |
| 1090 | |
| 1091 | return 1; |
| 1092 | } |
| 1093 | |
| 1094 | static int mpeg_mux_write_packet(AVFormatContext *ctx, AVPacket *pkt) |
| 1095 | { |
| 1096 | int stream_index = pkt->stream_index; |
| 1097 | int size = pkt->size; |
| 1098 | uint8_t *buf = pkt->data; |
| 1099 | MpegMuxContext *s = ctx->priv_data; |
| 1100 | AVStream *st = ctx->streams[stream_index]; |
| 1101 | StreamInfo *stream = st->priv_data; |
| 1102 | int64_t pts, dts; |
| 1103 | PacketDesc *pkt_desc; |
| 1104 | int preload; |
| 1105 | const int is_iframe = st->codec->codec_type == AVMEDIA_TYPE_VIDEO && |
| 1106 | (pkt->flags & AV_PKT_FLAG_KEY); |
| 1107 | |
| 1108 | preload = av_rescale(s->preload, 90000, AV_TIME_BASE); |
| 1109 | |
| 1110 | pts = pkt->pts; |
| 1111 | dts = pkt->dts; |
| 1112 | |
| 1113 | if (s->last_scr == AV_NOPTS_VALUE) { |
| 1114 | if (dts == AV_NOPTS_VALUE || (dts < preload && ctx->avoid_negative_ts) || s->is_dvd) { |
| 1115 | if (dts != AV_NOPTS_VALUE) |
| 1116 | s->preload += av_rescale(-dts, AV_TIME_BASE, 90000); |
| 1117 | s->last_scr = 0; |
| 1118 | } else { |
| 1119 | s->last_scr = dts - preload; |
| 1120 | s->preload = 0; |
| 1121 | } |
| 1122 | preload = av_rescale(s->preload, 90000, AV_TIME_BASE); |
| 1123 | av_log(ctx, AV_LOG_DEBUG, "First SCR: %"PRId64" First DTS: %"PRId64"\n", s->last_scr, dts + preload); |
| 1124 | } |
| 1125 | |
| 1126 | if (dts != AV_NOPTS_VALUE) dts += preload; |
| 1127 | if (pts != AV_NOPTS_VALUE) pts += preload; |
| 1128 | |
| 1129 | av_dlog(ctx, "dts:%f pts:%f flags:%d stream:%d nopts:%d\n", |
| 1130 | dts / 90000.0, pts / 90000.0, pkt->flags, |
| 1131 | pkt->stream_index, pts != AV_NOPTS_VALUE); |
| 1132 | if (!stream->premux_packet) |
| 1133 | stream->next_packet = &stream->premux_packet; |
| 1134 | *stream->next_packet = |
| 1135 | pkt_desc = av_mallocz(sizeof(PacketDesc)); |
| 1136 | pkt_desc->pts = pts; |
| 1137 | pkt_desc->dts = dts; |
| 1138 | pkt_desc->unwritten_size = |
| 1139 | pkt_desc->size = size; |
| 1140 | if (!stream->predecode_packet) |
| 1141 | stream->predecode_packet = pkt_desc; |
| 1142 | stream->next_packet = &pkt_desc->next; |
| 1143 | |
| 1144 | if (av_fifo_realloc2(stream->fifo, av_fifo_size(stream->fifo) + size) < 0) |
| 1145 | return -1; |
| 1146 | |
| 1147 | if (s->is_dvd) { |
| 1148 | // min VOBU length 0.4 seconds (mpucoder) |
| 1149 | if (is_iframe && |
| 1150 | (s->packet_number == 0 || |
| 1151 | (pts - stream->vobu_start_pts >= 36000))) { |
| 1152 | stream->bytes_to_iframe = av_fifo_size(stream->fifo); |
| 1153 | stream->align_iframe = 1; |
| 1154 | stream->vobu_start_pts = pts; |
| 1155 | } |
| 1156 | } |
| 1157 | |
| 1158 | av_fifo_generic_write(stream->fifo, buf, size, NULL); |
| 1159 | |
| 1160 | for (;;) { |
| 1161 | int ret = output_packet(ctx, 0); |
| 1162 | if (ret <= 0) |
| 1163 | return ret; |
| 1164 | } |
| 1165 | } |
| 1166 | |
| 1167 | static int mpeg_mux_end(AVFormatContext *ctx) |
| 1168 | { |
| 1169 | StreamInfo *stream; |
| 1170 | int i; |
| 1171 | |
| 1172 | for (;;) { |
| 1173 | int ret = output_packet(ctx, 1); |
| 1174 | if (ret < 0) |
| 1175 | return ret; |
| 1176 | else if (ret == 0) |
| 1177 | break; |
| 1178 | } |
| 1179 | |
| 1180 | /* End header according to MPEG1 systems standard. We do not write |
| 1181 | * it as it is usually not needed by decoders and because it |
| 1182 | * complicates MPEG stream concatenation. */ |
| 1183 | // avio_wb32(ctx->pb, ISO_11172_END_CODE); |
| 1184 | // avio_flush(ctx->pb); |
| 1185 | |
| 1186 | for (i = 0; i < ctx->nb_streams; i++) { |
| 1187 | stream = ctx->streams[i]->priv_data; |
| 1188 | |
| 1189 | assert(av_fifo_size(stream->fifo) == 0); |
| 1190 | av_fifo_freep(&stream->fifo); |
| 1191 | } |
| 1192 | return 0; |
| 1193 | } |
| 1194 | |
| 1195 | #define OFFSET(x) offsetof(MpegMuxContext, x) |
| 1196 | #define E AV_OPT_FLAG_ENCODING_PARAM |
| 1197 | static const AVOption options[] = { |
| 1198 | { "muxrate", NULL, OFFSET(user_mux_rate), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, ((1<<22) - 1) * (8 * 50), E }, |
| 1199 | { "preload", "Initial demux-decode delay in microseconds.", OFFSET(preload), AV_OPT_TYPE_INT, { .i64 = 500000 }, 0, INT_MAX, E }, |
| 1200 | { NULL }, |
| 1201 | }; |
| 1202 | |
| 1203 | #define MPEGENC_CLASS(flavor) \ |
| 1204 | static const AVClass flavor ## _class = { \ |
| 1205 | .class_name = #flavor " muxer", \ |
| 1206 | .item_name = av_default_item_name, \ |
| 1207 | .version = LIBAVUTIL_VERSION_INT, \ |
| 1208 | .option = options, \ |
| 1209 | }; |
| 1210 | |
| 1211 | #if CONFIG_MPEG1SYSTEM_MUXER |
| 1212 | MPEGENC_CLASS(mpeg) |
| 1213 | AVOutputFormat ff_mpeg1system_muxer = { |
| 1214 | .name = "mpeg", |
| 1215 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream"), |
| 1216 | .mime_type = "video/mpeg", |
| 1217 | .extensions = "mpg,mpeg", |
| 1218 | .priv_data_size = sizeof(MpegMuxContext), |
| 1219 | .audio_codec = AV_CODEC_ID_MP2, |
| 1220 | .video_codec = AV_CODEC_ID_MPEG1VIDEO, |
| 1221 | .write_header = mpeg_mux_init, |
| 1222 | .write_packet = mpeg_mux_write_packet, |
| 1223 | .write_trailer = mpeg_mux_end, |
| 1224 | .priv_class = &mpeg_class, |
| 1225 | }; |
| 1226 | #endif |
| 1227 | |
| 1228 | #if CONFIG_MPEG1VCD_MUXER |
| 1229 | MPEGENC_CLASS(vcd) |
| 1230 | AVOutputFormat ff_mpeg1vcd_muxer = { |
| 1231 | .name = "vcd", |
| 1232 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-1 Systems / MPEG program stream (VCD)"), |
| 1233 | .mime_type = "video/mpeg", |
| 1234 | .priv_data_size = sizeof(MpegMuxContext), |
| 1235 | .audio_codec = AV_CODEC_ID_MP2, |
| 1236 | .video_codec = AV_CODEC_ID_MPEG1VIDEO, |
| 1237 | .write_header = mpeg_mux_init, |
| 1238 | .write_packet = mpeg_mux_write_packet, |
| 1239 | .write_trailer = mpeg_mux_end, |
| 1240 | .priv_class = &vcd_class, |
| 1241 | }; |
| 1242 | #endif |
| 1243 | |
| 1244 | #if CONFIG_MPEG2VOB_MUXER |
| 1245 | MPEGENC_CLASS(vob) |
| 1246 | AVOutputFormat ff_mpeg2vob_muxer = { |
| 1247 | .name = "vob", |
| 1248 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (VOB)"), |
| 1249 | .mime_type = "video/mpeg", |
| 1250 | .extensions = "vob", |
| 1251 | .priv_data_size = sizeof(MpegMuxContext), |
| 1252 | .audio_codec = AV_CODEC_ID_MP2, |
| 1253 | .video_codec = AV_CODEC_ID_MPEG2VIDEO, |
| 1254 | .write_header = mpeg_mux_init, |
| 1255 | .write_packet = mpeg_mux_write_packet, |
| 1256 | .write_trailer = mpeg_mux_end, |
| 1257 | .priv_class = &vob_class, |
| 1258 | }; |
| 1259 | #endif |
| 1260 | |
| 1261 | /* Same as mpeg2vob_mux except that the pack size is 2324 */ |
| 1262 | #if CONFIG_MPEG2SVCD_MUXER |
| 1263 | MPEGENC_CLASS(svcd) |
| 1264 | AVOutputFormat ff_mpeg2svcd_muxer = { |
| 1265 | .name = "svcd", |
| 1266 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (SVCD)"), |
| 1267 | .mime_type = "video/mpeg", |
| 1268 | .extensions = "vob", |
| 1269 | .priv_data_size = sizeof(MpegMuxContext), |
| 1270 | .audio_codec = AV_CODEC_ID_MP2, |
| 1271 | .video_codec = AV_CODEC_ID_MPEG2VIDEO, |
| 1272 | .write_header = mpeg_mux_init, |
| 1273 | .write_packet = mpeg_mux_write_packet, |
| 1274 | .write_trailer = mpeg_mux_end, |
| 1275 | .priv_class = &svcd_class, |
| 1276 | }; |
| 1277 | #endif |
| 1278 | |
| 1279 | /* Same as mpeg2vob_mux except the 'is_dvd' flag is set to produce NAV pkts */ |
| 1280 | #if CONFIG_MPEG2DVD_MUXER |
| 1281 | MPEGENC_CLASS(dvd) |
| 1282 | AVOutputFormat ff_mpeg2dvd_muxer = { |
| 1283 | .name = "dvd", |
| 1284 | .long_name = NULL_IF_CONFIG_SMALL("MPEG-2 PS (DVD VOB)"), |
| 1285 | .mime_type = "video/mpeg", |
| 1286 | .extensions = "dvd", |
| 1287 | .priv_data_size = sizeof(MpegMuxContext), |
| 1288 | .audio_codec = AV_CODEC_ID_MP2, |
| 1289 | .video_codec = AV_CODEC_ID_MPEG2VIDEO, |
| 1290 | .write_header = mpeg_mux_init, |
| 1291 | .write_packet = mpeg_mux_write_packet, |
| 1292 | .write_trailer = mpeg_mux_end, |
| 1293 | .priv_class = &dvd_class, |
| 1294 | }; |
| 1295 | #endif |