Libav 0.7.1
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00001 /* 00002 * IEC 61937 muxer 00003 * Copyright (c) 2009 Bartlomiej Wolowiec 00004 * Copyright (c) 2010 Anssi Hannula 00005 * Copyright (c) 2010 Carl Eugen Hoyos 00006 * 00007 * This file is part of Libav. 00008 * 00009 * Libav is free software; you can redistribute it and/or 00010 * modify it under the terms of the GNU Lesser General Public 00011 * License as published by the Free Software Foundation; either 00012 * version 2.1 of the License, or (at your option) any later version. 00013 * 00014 * Libav is distributed in the hope that it will be useful, 00015 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00016 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00017 * Lesser General Public License for more details. 00018 * 00019 * You should have received a copy of the GNU Lesser General Public 00020 * License along with Libav; if not, write to the Free Software 00021 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00022 */ 00023 00032 /* 00033 * Terminology used in specification: 00034 * data-burst - IEC61937 frame, contains header and encapsuled frame 00035 * burst-preambule - IEC61937 frame header, contains 16-bits words named Pa, Pb, Pc and Pd 00036 * burst-payload - encapsuled frame 00037 * Pa, Pb - syncword - 0xF872, 0x4E1F 00038 * Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12) 00039 * and bitstream number (bits 13-15) 00040 * data-type - determines type of encapsuled frames 00041 * Pd - length code (number of bits or bytes of encapsuled frame - according to data_type) 00042 * 00043 * IEC 61937 frames at normal usage start every specific count of bytes, 00044 * dependent from data-type (spaces between packets are filled by zeros) 00045 */ 00046 00047 #include "avformat.h" 00048 #include "avio_internal.h" 00049 #include "spdif.h" 00050 #include "libavcodec/ac3.h" 00051 #include "libavcodec/dca.h" 00052 #include "libavcodec/dcadata.h" 00053 #include "libavcodec/aacadtsdec.h" 00054 #include "libavutil/opt.h" 00055 00056 typedef struct IEC61937Context { 00057 const AVClass *av_class; 00058 enum IEC61937DataType data_type; 00059 int length_code; 00060 int pkt_offset; 00061 uint8_t *buffer; 00062 int buffer_size; 00063 00064 uint8_t *out_buf; 00065 int out_bytes; 00066 00067 int use_preamble; 00068 int extra_bswap; 00069 00070 uint8_t *hd_buf; 00071 int hd_buf_size; 00072 int hd_buf_count; 00073 int hd_buf_filled; 00074 00075 int dtshd_skip; 00076 00077 /* AVOptions: */ 00078 int dtshd_rate; 00079 int dtshd_fallback; 00080 #define SPDIF_FLAG_BIGENDIAN 0x01 00081 int spdif_flags; 00082 00085 int (*header_info) (AVFormatContext *s, AVPacket *pkt); 00086 } IEC61937Context; 00087 00088 static const AVOption options[] = { 00089 { "spdif_flags", "IEC 61937 encapsulation flags", offsetof(IEC61937Context, spdif_flags), FF_OPT_TYPE_FLAGS, {.dbl = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" }, 00090 { "be", "output in big-endian format (for use as s16be)", 0, FF_OPT_TYPE_CONST, {.dbl = SPDIF_FLAG_BIGENDIAN}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" }, 00091 { "dtshd_rate", "mux complete DTS frames in HD mode at the specified IEC958 rate (in Hz, default 0=disabled)", offsetof(IEC61937Context, dtshd_rate), FF_OPT_TYPE_INT, {.dbl = 0}, 0, 768000, AV_OPT_FLAG_ENCODING_PARAM }, 00092 { "dtshd_fallback_time", "min secs to strip HD for after an overflow (-1: till the end, default 60)", offsetof(IEC61937Context, dtshd_fallback), FF_OPT_TYPE_INT, {.dbl = 60}, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM }, 00093 { NULL }, 00094 }; 00095 00096 static const AVClass class = { 00097 .class_name = "spdif", 00098 .item_name = av_default_item_name, 00099 .option = options, 00100 .version = LIBAVUTIL_VERSION_INT, 00101 }; 00102 00103 static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt) 00104 { 00105 IEC61937Context *ctx = s->priv_data; 00106 int bitstream_mode = pkt->data[5] & 0x7; 00107 00108 ctx->data_type = IEC61937_AC3 | (bitstream_mode << 8); 00109 ctx->pkt_offset = AC3_FRAME_SIZE << 2; 00110 return 0; 00111 } 00112 00113 static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt) 00114 { 00115 IEC61937Context *ctx = s->priv_data; 00116 static const uint8_t eac3_repeat[4] = {6, 3, 2, 1}; 00117 int repeat = 1; 00118 00119 if ((pkt->data[4] & 0xc0) != 0xc0) /* fscod */ 00120 repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */ 00121 00122 ctx->hd_buf = av_fast_realloc(ctx->hd_buf, &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size); 00123 if (!ctx->hd_buf) 00124 return AVERROR(ENOMEM); 00125 00126 memcpy(&ctx->hd_buf[ctx->hd_buf_filled], pkt->data, pkt->size); 00127 00128 ctx->hd_buf_filled += pkt->size; 00129 if (++ctx->hd_buf_count < repeat){ 00130 ctx->pkt_offset = 0; 00131 return 0; 00132 } 00133 ctx->data_type = IEC61937_EAC3; 00134 ctx->pkt_offset = 24576; 00135 ctx->out_buf = ctx->hd_buf; 00136 ctx->out_bytes = ctx->hd_buf_filled; 00137 ctx->length_code = ctx->hd_buf_filled; 00138 00139 ctx->hd_buf_count = 0; 00140 ctx->hd_buf_filled = 0; 00141 return 0; 00142 } 00143 00144 /* 00145 * DTS type IV (DTS-HD) can be transmitted with various frame repetition 00146 * periods; longer repetition periods allow for longer packets and therefore 00147 * higher bitrate. Longer repetition periods mean that the constant bitrate of 00148 * the outputted IEC 61937 stream is higher. 00149 * The repetition period is measured in IEC 60958 frames (4 bytes). 00150 */ 00151 static int spdif_dts4_subtype(int period) 00152 { 00153 switch (period) { 00154 case 512: return 0x0; 00155 case 1024: return 0x1; 00156 case 2048: return 0x2; 00157 case 4096: return 0x3; 00158 case 8192: return 0x4; 00159 case 16384: return 0x5; 00160 } 00161 return -1; 00162 } 00163 00164 static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size, 00165 int sample_rate, int blocks) 00166 { 00167 IEC61937Context *ctx = s->priv_data; 00168 static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe }; 00169 int pkt_size = pkt->size; 00170 int period; 00171 int subtype; 00172 00173 if (!core_size) { 00174 av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n"); 00175 return AVERROR(EINVAL); 00176 } 00177 00178 if (!sample_rate) { 00179 av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n"); 00180 return AVERROR_INVALIDDATA; 00181 } 00182 00183 period = ctx->dtshd_rate * (blocks << 5) / sample_rate; 00184 subtype = spdif_dts4_subtype(period); 00185 00186 if (subtype < 0) { 00187 av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an " 00188 "impossible repetition period of %d for the current DTS stream" 00189 " (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period, 00190 blocks << 5, sample_rate); 00191 return AVERROR(EINVAL); 00192 } 00193 00194 /* set pkt_offset and DTS IV subtype according to the requested output 00195 * rate */ 00196 ctx->pkt_offset = period * 4; 00197 ctx->data_type = IEC61937_DTSHD | subtype << 8; 00198 00199 /* If the bitrate is too high for transmitting at the selected 00200 * repetition period setting, strip DTS-HD until a good amount 00201 * of consecutive non-overflowing HD frames have been observed. 00202 * This generally only happens if the caller is cramming a Master 00203 * Audio stream into 192kHz IEC 60958 (which may or may not fit). */ 00204 if (sizeof(dtshd_start_code) + 2 + pkt_size 00205 > ctx->pkt_offset - BURST_HEADER_SIZE && core_size) { 00206 if (!ctx->dtshd_skip) 00207 av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, " 00208 "temporarily sending core only\n"); 00209 if (ctx->dtshd_fallback > 0) 00210 ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5); 00211 else 00212 /* skip permanently (dtshd_fallback == -1) or just once 00213 * (dtshd_fallback == 0) */ 00214 ctx->dtshd_skip = 1; 00215 } 00216 if (ctx->dtshd_skip && core_size) { 00217 pkt_size = core_size; 00218 if (ctx->dtshd_fallback >= 0) 00219 --ctx->dtshd_skip; 00220 } 00221 00222 ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size; 00223 ctx->length_code = ctx->out_bytes; 00224 00225 av_fast_malloc(&ctx->hd_buf, &ctx->hd_buf_size, ctx->out_bytes); 00226 if (!ctx->hd_buf) 00227 return AVERROR(ENOMEM); 00228 00229 ctx->out_buf = ctx->hd_buf; 00230 00231 memcpy(ctx->hd_buf, dtshd_start_code, sizeof(dtshd_start_code)); 00232 AV_WB16(ctx->hd_buf + sizeof(dtshd_start_code), pkt_size); 00233 memcpy(ctx->hd_buf + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size); 00234 00235 return 0; 00236 } 00237 00238 static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt) 00239 { 00240 IEC61937Context *ctx = s->priv_data; 00241 uint32_t syncword_dts = AV_RB32(pkt->data); 00242 int blocks; 00243 int sample_rate = 0; 00244 int core_size = 0; 00245 00246 if (pkt->size < 9) 00247 return AVERROR_INVALIDDATA; 00248 00249 switch (syncword_dts) { 00250 case DCA_MARKER_RAW_BE: 00251 blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f; 00252 core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1; 00253 sample_rate = dca_sample_rates[(pkt->data[8] >> 2) & 0x0f]; 00254 break; 00255 case DCA_MARKER_RAW_LE: 00256 blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f; 00257 ctx->extra_bswap = 1; 00258 break; 00259 case DCA_MARKER_14B_BE: 00260 blocks = 00261 (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2)); 00262 break; 00263 case DCA_MARKER_14B_LE: 00264 blocks = 00265 (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2)); 00266 ctx->extra_bswap = 1; 00267 break; 00268 case DCA_HD_MARKER: 00269 /* We only handle HD frames that are paired with core. However, 00270 sometimes DTS-HD streams with core have a stray HD frame without 00271 core in the beginning of the stream. */ 00272 av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n"); 00273 return AVERROR_INVALIDDATA; 00274 default: 00275 av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%x\n", syncword_dts); 00276 return AVERROR_INVALIDDATA; 00277 } 00278 blocks++; 00279 00280 if (ctx->dtshd_rate) 00281 /* DTS type IV output requested */ 00282 return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks); 00283 00284 switch (blocks) { 00285 case 512 >> 5: ctx->data_type = IEC61937_DTS1; break; 00286 case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break; 00287 case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break; 00288 default: 00289 av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n", 00290 blocks << 5); 00291 return AVERROR(ENOSYS); 00292 } 00293 00294 /* discard extraneous data by default */ 00295 if (core_size && core_size < pkt->size) { 00296 ctx->out_bytes = core_size; 00297 ctx->length_code = core_size << 3; 00298 } 00299 00300 ctx->pkt_offset = blocks << 7; 00301 00302 if (ctx->out_bytes == ctx->pkt_offset) { 00303 /* The DTS stream fits exactly into the output stream, so skip the 00304 * preamble as it would not fit in there. This is the case for dts 00305 * discs and dts-in-wav. */ 00306 ctx->use_preamble = 0; 00307 } else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) { 00308 av_log_ask_for_sample(s, "Unrecognized large DTS frame."); 00309 /* This will fail with a "bitrate too high" in the caller */ 00310 } 00311 00312 return 0; 00313 } 00314 00315 static const enum IEC61937DataType mpeg_data_type[2][3] = { 00316 // LAYER1 LAYER2 LAYER3 00317 { IEC61937_MPEG2_LAYER1_LSF, IEC61937_MPEG2_LAYER2_LSF, IEC61937_MPEG2_LAYER3_LSF },//MPEG2 LSF 00318 { IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, //MPEG1 00319 }; 00320 00321 static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt) 00322 { 00323 IEC61937Context *ctx = s->priv_data; 00324 int version = (pkt->data[1] >> 3) & 3; 00325 int layer = 3 - ((pkt->data[1] >> 1) & 3); 00326 int extension = pkt->data[2] & 1; 00327 00328 if (layer == 3 || version == 1) { 00329 av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n"); 00330 return AVERROR_INVALIDDATA; 00331 } 00332 av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension); 00333 if (version == 2 && extension) { 00334 ctx->data_type = IEC61937_MPEG2_EXT; 00335 ctx->pkt_offset = 4608; 00336 } else { 00337 ctx->data_type = mpeg_data_type [version & 1][layer]; 00338 ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer]; 00339 } 00340 // TODO Data type dependant info (normal/karaoke, dynamic range control) 00341 return 0; 00342 } 00343 00344 static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt) 00345 { 00346 IEC61937Context *ctx = s->priv_data; 00347 AACADTSHeaderInfo hdr; 00348 GetBitContext gbc; 00349 int ret; 00350 00351 init_get_bits(&gbc, pkt->data, AAC_ADTS_HEADER_SIZE * 8); 00352 ret = ff_aac_parse_header(&gbc, &hdr); 00353 if (ret < 0) { 00354 av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n"); 00355 return AVERROR_INVALIDDATA; 00356 } 00357 00358 ctx->pkt_offset = hdr.samples << 2; 00359 switch (hdr.num_aac_frames) { 00360 case 1: 00361 ctx->data_type = IEC61937_MPEG2_AAC; 00362 break; 00363 case 2: 00364 ctx->data_type = IEC61937_MPEG2_AAC_LSF_2048; 00365 break; 00366 case 4: 00367 ctx->data_type = IEC61937_MPEG2_AAC_LSF_4096; 00368 break; 00369 default: 00370 av_log(s, AV_LOG_ERROR, "%i samples in AAC frame not supported\n", 00371 hdr.samples); 00372 return AVERROR(EINVAL); 00373 } 00374 //TODO Data type dependent info (LC profile/SBR) 00375 return 0; 00376 } 00377 00378 00379 /* 00380 * It seems Dolby TrueHD frames have to be encapsulated in MAT frames before 00381 * they can be encapsulated in IEC 61937. 00382 * Here we encapsulate 24 TrueHD frames in a single MAT frame, padding them 00383 * to achieve constant rate. 00384 * The actual format of a MAT frame is unknown, but the below seems to work. 00385 * However, it seems it is not actually necessary for the 24 TrueHD frames to 00386 * be in an exact alignment with the MAT frame. 00387 */ 00388 #define MAT_FRAME_SIZE 61424 00389 #define TRUEHD_FRAME_OFFSET 2560 00390 #define MAT_MIDDLE_CODE_OFFSET -4 00391 00392 static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt) 00393 { 00394 IEC61937Context *ctx = s->priv_data; 00395 int mat_code_length = 0; 00396 const char mat_end_code[16] = { 0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11 }; 00397 00398 if (!ctx->hd_buf_count) { 00399 const char mat_start_code[20] = { 0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83, 0x49, 0x80, 0x77, 0xE0 }; 00400 mat_code_length = sizeof(mat_start_code) + BURST_HEADER_SIZE; 00401 memcpy(ctx->hd_buf, mat_start_code, sizeof(mat_start_code)); 00402 00403 } else if (ctx->hd_buf_count == 12) { 00404 const char mat_middle_code[12] = { 0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0 }; 00405 mat_code_length = sizeof(mat_middle_code) + MAT_MIDDLE_CODE_OFFSET; 00406 memcpy(&ctx->hd_buf[12 * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + MAT_MIDDLE_CODE_OFFSET], 00407 mat_middle_code, sizeof(mat_middle_code)); 00408 } 00409 00410 if (pkt->size > TRUEHD_FRAME_OFFSET - mat_code_length) { 00411 /* if such frames exist, we'd need some more complex logic to 00412 * distribute the TrueHD frames in the MAT frame */ 00413 av_log(s, AV_LOG_ERROR, "TrueHD frame too big, %d bytes\n", pkt->size); 00414 av_log_ask_for_sample(s, NULL); 00415 return AVERROR_INVALIDDATA; 00416 } 00417 00418 memcpy(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length], 00419 pkt->data, pkt->size); 00420 memset(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length + pkt->size], 00421 0, TRUEHD_FRAME_OFFSET - pkt->size - mat_code_length); 00422 00423 if (++ctx->hd_buf_count < 24){ 00424 ctx->pkt_offset = 0; 00425 return 0; 00426 } 00427 memcpy(&ctx->hd_buf[MAT_FRAME_SIZE - sizeof(mat_end_code)], mat_end_code, sizeof(mat_end_code)); 00428 ctx->hd_buf_count = 0; 00429 00430 ctx->data_type = IEC61937_TRUEHD; 00431 ctx->pkt_offset = 61440; 00432 ctx->out_buf = ctx->hd_buf; 00433 ctx->out_bytes = MAT_FRAME_SIZE; 00434 ctx->length_code = MAT_FRAME_SIZE; 00435 return 0; 00436 } 00437 00438 static int spdif_write_header(AVFormatContext *s) 00439 { 00440 IEC61937Context *ctx = s->priv_data; 00441 00442 switch (s->streams[0]->codec->codec_id) { 00443 case CODEC_ID_AC3: 00444 ctx->header_info = spdif_header_ac3; 00445 break; 00446 case CODEC_ID_EAC3: 00447 ctx->header_info = spdif_header_eac3; 00448 break; 00449 case CODEC_ID_MP1: 00450 case CODEC_ID_MP2: 00451 case CODEC_ID_MP3: 00452 ctx->header_info = spdif_header_mpeg; 00453 break; 00454 case CODEC_ID_DTS: 00455 ctx->header_info = spdif_header_dts; 00456 break; 00457 case CODEC_ID_AAC: 00458 ctx->header_info = spdif_header_aac; 00459 break; 00460 case CODEC_ID_TRUEHD: 00461 ctx->header_info = spdif_header_truehd; 00462 ctx->hd_buf = av_malloc(MAT_FRAME_SIZE); 00463 if (!ctx->hd_buf) 00464 return AVERROR(ENOMEM); 00465 break; 00466 default: 00467 av_log(s, AV_LOG_ERROR, "codec not supported\n"); 00468 return AVERROR_PATCHWELCOME; 00469 } 00470 return 0; 00471 } 00472 00473 static int spdif_write_trailer(AVFormatContext *s) 00474 { 00475 IEC61937Context *ctx = s->priv_data; 00476 av_freep(&ctx->buffer); 00477 av_freep(&ctx->hd_buf); 00478 return 0; 00479 } 00480 00481 static av_always_inline void spdif_put_16(IEC61937Context *ctx, 00482 AVIOContext *pb, unsigned int val) 00483 { 00484 if (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN) 00485 avio_wb16(pb, val); 00486 else 00487 avio_wl16(pb, val); 00488 } 00489 00490 static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt) 00491 { 00492 IEC61937Context *ctx = s->priv_data; 00493 int ret, padding; 00494 00495 ctx->out_buf = pkt->data; 00496 ctx->out_bytes = pkt->size; 00497 ctx->length_code = FFALIGN(pkt->size, 2) << 3; 00498 ctx->use_preamble = 1; 00499 ctx->extra_bswap = 0; 00500 00501 ret = ctx->header_info(s, pkt); 00502 if (ret < 0) 00503 return ret; 00504 if (!ctx->pkt_offset) 00505 return 0; 00506 00507 padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1; 00508 if (padding < 0) { 00509 av_log(s, AV_LOG_ERROR, "bitrate is too high\n"); 00510 return AVERROR(EINVAL); 00511 } 00512 00513 if (ctx->use_preamble) { 00514 spdif_put_16(ctx, s->pb, SYNCWORD1); //Pa 00515 spdif_put_16(ctx, s->pb, SYNCWORD2); //Pb 00516 spdif_put_16(ctx, s->pb, ctx->data_type); //Pc 00517 spdif_put_16(ctx, s->pb, ctx->length_code);//Pd 00518 } 00519 00520 if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) { 00521 avio_write(s->pb, ctx->out_buf, ctx->out_bytes & ~1); 00522 } else { 00523 av_fast_malloc(&ctx->buffer, &ctx->buffer_size, ctx->out_bytes + FF_INPUT_BUFFER_PADDING_SIZE); 00524 if (!ctx->buffer) 00525 return AVERROR(ENOMEM); 00526 ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1); 00527 avio_write(s->pb, ctx->buffer, ctx->out_bytes & ~1); 00528 } 00529 00530 /* a final lone byte has to be MSB aligned */ 00531 if (ctx->out_bytes & 1) 00532 spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8); 00533 00534 ffio_fill(s->pb, 0, padding); 00535 00536 av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n", 00537 ctx->data_type, ctx->out_bytes, ctx->pkt_offset); 00538 00539 avio_flush(s->pb); 00540 return 0; 00541 } 00542 00543 AVOutputFormat ff_spdif_muxer = { 00544 "spdif", 00545 NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"), 00546 NULL, 00547 "spdif", 00548 sizeof(IEC61937Context), 00549 CODEC_ID_AC3, 00550 CODEC_ID_NONE, 00551 spdif_write_header, 00552 spdif_write_packet, 00553 spdif_write_trailer, 00554 .flags = AVFMT_NOTIMESTAMPS, 00555 .priv_class = &class, 00556 };