LCOV - code coverage report
Current view: top level - libavformat - spdifenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 0 261 0.0 %
Date: 2018-05-20 11:54:08 Functions: 0 12 0.0 %

          Line data    Source code
       1             : /*
       2             :  * IEC 61937 muxer
       3             :  * Copyright (c) 2009 Bartlomiej Wolowiec
       4             :  * Copyright (c) 2010 Anssi Hannula
       5             :  * Copyright (c) 2010 Carl Eugen Hoyos
       6             :  *
       7             :  * This file is part of FFmpeg.
       8             :  *
       9             :  * FFmpeg is free software; you can redistribute it and/or
      10             :  * modify it under the terms of the GNU Lesser General Public
      11             :  * License as published by the Free Software Foundation; either
      12             :  * version 2.1 of the License, or (at your option) any later version.
      13             :  *
      14             :  * FFmpeg is distributed in the hope that it will be useful,
      15             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      16             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      17             :  * Lesser General Public License for more details.
      18             :  *
      19             :  * You should have received a copy of the GNU Lesser General Public
      20             :  * License along with FFmpeg; if not, write to the Free Software
      21             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      22             :  */
      23             : 
      24             : /**
      25             :  * @file
      26             :  * IEC-61937 encapsulation of various formats, used by S/PDIF
      27             :  * @author Bartlomiej Wolowiec
      28             :  * @author Anssi Hannula
      29             :  * @author Carl Eugen Hoyos
      30             :  */
      31             : 
      32             : /*
      33             :  * Terminology used in specification:
      34             :  * data-burst - IEC61937 frame, contains header and encapsuled frame
      35             :  * burst-preamble - IEC61937 frame header, contains 16-bit words named Pa, Pb, Pc and Pd
      36             :  * burst-payload - encapsuled frame
      37             :  * Pa, Pb - syncword - 0xF872, 0x4E1F
      38             :  * Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12)
      39             :  *      and bitstream number (bits 13-15)
      40             :  * data-type - determines type of encapsuled frames
      41             :  * Pd - length code (number of bits or bytes of encapsuled frame - according to data_type)
      42             :  *
      43             :  * IEC 61937 frames at normal usage start every specific count of bytes,
      44             :  *      dependent from data-type (spaces between packets are filled by zeros)
      45             :  */
      46             : 
      47             : #include <inttypes.h>
      48             : 
      49             : #include "avformat.h"
      50             : #include "avio_internal.h"
      51             : #include "spdif.h"
      52             : #include "libavcodec/ac3.h"
      53             : #include "libavcodec/adts_parser.h"
      54             : #include "libavcodec/dca.h"
      55             : #include "libavcodec/dca_syncwords.h"
      56             : #include "libavutil/opt.h"
      57             : 
      58             : typedef struct IEC61937Context {
      59             :     const AVClass *av_class;
      60             :     enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst
      61             :     int length_code;                ///< length code in bits or bytes, depending on data type
      62             :     int pkt_offset;                 ///< data burst repetition period in bytes
      63             :     uint8_t *buffer;                ///< allocated buffer, used for swap bytes
      64             :     int buffer_size;                ///< size of allocated buffer
      65             : 
      66             :     uint8_t *out_buf;               ///< pointer to the outgoing data before byte-swapping
      67             :     int out_bytes;                  ///< amount of outgoing bytes
      68             : 
      69             :     int use_preamble;               ///< preamble enabled (disabled for exactly pre-padded DTS)
      70             :     int extra_bswap;                ///< extra bswap for payload (for LE DTS => standard BE DTS)
      71             : 
      72             :     uint8_t *hd_buf;                ///< allocated buffer to concatenate hd audio frames
      73             :     int hd_buf_size;                ///< size of the hd audio buffer
      74             :     int hd_buf_count;               ///< number of frames in the hd audio buffer
      75             :     int hd_buf_filled;              ///< amount of bytes in the hd audio buffer
      76             : 
      77             :     int dtshd_skip;                 ///< counter used for skipping DTS-HD frames
      78             : 
      79             :     /* AVOptions: */
      80             :     int dtshd_rate;
      81             :     int dtshd_fallback;
      82             : #define SPDIF_FLAG_BIGENDIAN    0x01
      83             :     int spdif_flags;
      84             : 
      85             :     /// function, which generates codec dependent header information.
      86             :     /// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary
      87             :     int (*header_info) (AVFormatContext *s, AVPacket *pkt);
      88             : } IEC61937Context;
      89             : 
      90             : static const AVOption options[] = {
      91             : { "spdif_flags", "IEC 61937 encapsulation flags", offsetof(IEC61937Context, spdif_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
      92             : { "be", "output in big-endian format (for use as s16be)", 0, AV_OPT_TYPE_CONST, {.i64 = SPDIF_FLAG_BIGENDIAN},  0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, "spdif_flags" },
      93             : { "dtshd_rate", "mux complete DTS frames in HD mode at the specified IEC958 rate (in Hz, default 0=disabled)", offsetof(IEC61937Context, dtshd_rate), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 768000, AV_OPT_FLAG_ENCODING_PARAM },
      94             : { "dtshd_fallback_time", "min secs to strip HD for after an overflow (-1: till the end, default 60)", offsetof(IEC61937Context, dtshd_fallback), AV_OPT_TYPE_INT, {.i64 = 60}, -1, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
      95             : { NULL },
      96             : };
      97             : 
      98             : static const AVClass spdif_class = {
      99             :     .class_name     = "spdif",
     100             :     .item_name      = av_default_item_name,
     101             :     .option         = options,
     102             :     .version        = LIBAVUTIL_VERSION_INT,
     103             : };
     104             : 
     105           0 : static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt)
     106             : {
     107           0 :     IEC61937Context *ctx = s->priv_data;
     108           0 :     int bitstream_mode = pkt->data[5] & 0x7;
     109             : 
     110           0 :     ctx->data_type  = IEC61937_AC3 | (bitstream_mode << 8);
     111           0 :     ctx->pkt_offset = AC3_FRAME_SIZE << 2;
     112           0 :     return 0;
     113             : }
     114             : 
     115           0 : static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt)
     116             : {
     117           0 :     IEC61937Context *ctx = s->priv_data;
     118             :     static const uint8_t eac3_repeat[4] = {6, 3, 2, 1};
     119           0 :     int repeat = 1;
     120             : 
     121           0 :     int bsid = pkt->data[5] >> 3;
     122           0 :     if (bsid > 10 && (pkt->data[4] & 0xc0) != 0xc0) /* fscod */
     123           0 :         repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */
     124             : 
     125           0 :     ctx->hd_buf = av_fast_realloc(ctx->hd_buf, &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size);
     126           0 :     if (!ctx->hd_buf)
     127           0 :         return AVERROR(ENOMEM);
     128             : 
     129           0 :     memcpy(&ctx->hd_buf[ctx->hd_buf_filled], pkt->data, pkt->size);
     130             : 
     131           0 :     ctx->hd_buf_filled += pkt->size;
     132           0 :     if (++ctx->hd_buf_count < repeat){
     133           0 :         ctx->pkt_offset = 0;
     134           0 :         return 0;
     135             :     }
     136           0 :     ctx->data_type   = IEC61937_EAC3;
     137           0 :     ctx->pkt_offset  = 24576;
     138           0 :     ctx->out_buf     = ctx->hd_buf;
     139           0 :     ctx->out_bytes   = ctx->hd_buf_filled;
     140           0 :     ctx->length_code = ctx->hd_buf_filled;
     141             : 
     142           0 :     ctx->hd_buf_count  = 0;
     143           0 :     ctx->hd_buf_filled = 0;
     144           0 :     return 0;
     145             : }
     146             : 
     147             : /*
     148             :  * DTS type IV (DTS-HD) can be transmitted with various frame repetition
     149             :  * periods; longer repetition periods allow for longer packets and therefore
     150             :  * higher bitrate. Longer repetition periods mean that the constant bitrate of
     151             :  * the output IEC 61937 stream is higher.
     152             :  * The repetition period is measured in IEC 60958 frames (4 bytes).
     153             :  */
     154           0 : static int spdif_dts4_subtype(int period)
     155             : {
     156           0 :     switch (period) {
     157           0 :     case 512:   return 0x0;
     158           0 :     case 1024:  return 0x1;
     159           0 :     case 2048:  return 0x2;
     160           0 :     case 4096:  return 0x3;
     161           0 :     case 8192:  return 0x4;
     162           0 :     case 16384: return 0x5;
     163             :     }
     164           0 :     return -1;
     165             : }
     166             : 
     167           0 : static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
     168             :                              int sample_rate, int blocks)
     169             : {
     170           0 :     IEC61937Context *ctx = s->priv_data;
     171             :     static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe };
     172           0 :     int pkt_size = pkt->size;
     173             :     int period;
     174             :     int subtype;
     175             : 
     176           0 :     if (!core_size) {
     177           0 :         av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n");
     178           0 :         return AVERROR(EINVAL);
     179             :     }
     180             : 
     181           0 :     if (!sample_rate) {
     182           0 :         av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n");
     183           0 :         return AVERROR_INVALIDDATA;
     184             :     }
     185             : 
     186           0 :     period = ctx->dtshd_rate * (blocks << 5) / sample_rate;
     187           0 :     subtype = spdif_dts4_subtype(period);
     188             : 
     189           0 :     if (subtype < 0) {
     190           0 :         av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an "
     191             :                "impossible repetition period of %d for the current DTS stream"
     192             :                " (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period,
     193             :                blocks << 5, sample_rate);
     194           0 :         return AVERROR(EINVAL);
     195             :     }
     196             : 
     197             :     /* set pkt_offset and DTS IV subtype according to the requested output
     198             :      * rate */
     199           0 :     ctx->pkt_offset = period * 4;
     200           0 :     ctx->data_type = IEC61937_DTSHD | subtype << 8;
     201             : 
     202             :     /* If the bitrate is too high for transmitting at the selected
     203             :      * repetition period setting, strip DTS-HD until a good amount
     204             :      * of consecutive non-overflowing HD frames have been observed.
     205             :      * This generally only happens if the caller is cramming a Master
     206             :      * Audio stream into 192kHz IEC 60958 (which may or may not fit). */
     207           0 :     if (sizeof(dtshd_start_code) + 2 + pkt_size
     208           0 :             > ctx->pkt_offset - BURST_HEADER_SIZE && core_size) {
     209           0 :         if (!ctx->dtshd_skip)
     210           0 :             av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, "
     211             :                                       "temporarily sending core only\n");
     212           0 :         if (ctx->dtshd_fallback > 0)
     213           0 :             ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5);
     214             :         else
     215             :             /* skip permanently (dtshd_fallback == -1) or just once
     216             :              * (dtshd_fallback == 0) */
     217           0 :             ctx->dtshd_skip = 1;
     218             :     }
     219           0 :     if (ctx->dtshd_skip && core_size) {
     220           0 :         pkt_size = core_size;
     221           0 :         if (ctx->dtshd_fallback >= 0)
     222           0 :             --ctx->dtshd_skip;
     223             :     }
     224             : 
     225           0 :     ctx->out_bytes   = sizeof(dtshd_start_code) + 2 + pkt_size;
     226             : 
     227             :     /* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
     228             :      * with some receivers, but the exact requirement is unconfirmed. */
     229           0 :     ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8;
     230             : 
     231           0 :     av_fast_malloc(&ctx->hd_buf, &ctx->hd_buf_size, ctx->out_bytes);
     232           0 :     if (!ctx->hd_buf)
     233           0 :         return AVERROR(ENOMEM);
     234             : 
     235           0 :     ctx->out_buf = ctx->hd_buf;
     236             : 
     237           0 :     memcpy(ctx->hd_buf, dtshd_start_code, sizeof(dtshd_start_code));
     238           0 :     AV_WB16(ctx->hd_buf + sizeof(dtshd_start_code), pkt_size);
     239           0 :     memcpy(ctx->hd_buf + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size);
     240             : 
     241           0 :     return 0;
     242             : }
     243             : 
     244           0 : static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt)
     245             : {
     246           0 :     IEC61937Context *ctx = s->priv_data;
     247           0 :     uint32_t syncword_dts = AV_RB32(pkt->data);
     248             :     int blocks;
     249           0 :     int sample_rate = 0;
     250           0 :     int core_size = 0;
     251             : 
     252           0 :     if (pkt->size < 9)
     253           0 :         return AVERROR_INVALIDDATA;
     254             : 
     255           0 :     switch (syncword_dts) {
     256           0 :     case DCA_SYNCWORD_CORE_BE:
     257           0 :         blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
     258           0 :         core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1;
     259           0 :         sample_rate = avpriv_dca_sample_rates[(pkt->data[8] >> 2) & 0x0f];
     260           0 :         break;
     261           0 :     case DCA_SYNCWORD_CORE_LE:
     262           0 :         blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
     263           0 :         ctx->extra_bswap = 1;
     264           0 :         break;
     265           0 :     case DCA_SYNCWORD_CORE_14B_BE:
     266           0 :         blocks =
     267           0 :             (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2));
     268           0 :         break;
     269           0 :     case DCA_SYNCWORD_CORE_14B_LE:
     270           0 :         blocks =
     271           0 :             (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2));
     272           0 :         ctx->extra_bswap = 1;
     273           0 :         break;
     274           0 :     case DCA_SYNCWORD_SUBSTREAM:
     275             :         /* We only handle HD frames that are paired with core. However,
     276             :            sometimes DTS-HD streams with core have a stray HD frame without
     277             :            core in the beginning of the stream. */
     278           0 :         av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n");
     279           0 :         return AVERROR_INVALIDDATA;
     280           0 :     default:
     281           0 :         av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%"PRIx32"\n", syncword_dts);
     282           0 :         return AVERROR_INVALIDDATA;
     283             :     }
     284           0 :     blocks++;
     285             : 
     286           0 :     if (ctx->dtshd_rate)
     287             :         /* DTS type IV output requested */
     288           0 :         return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks);
     289             : 
     290           0 :     switch (blocks) {
     291           0 :     case  512 >> 5: ctx->data_type = IEC61937_DTS1; break;
     292           0 :     case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break;
     293           0 :     case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break;
     294           0 :     default:
     295           0 :         av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n",
     296             :                blocks << 5);
     297           0 :         return AVERROR(ENOSYS);
     298             :     }
     299             : 
     300             :     /* discard extraneous data by default */
     301           0 :     if (core_size && core_size < pkt->size) {
     302           0 :         ctx->out_bytes = core_size;
     303           0 :         ctx->length_code = core_size << 3;
     304             :     }
     305             : 
     306           0 :     ctx->pkt_offset = blocks << 7;
     307             : 
     308           0 :     if (ctx->out_bytes == ctx->pkt_offset) {
     309             :         /* The DTS stream fits exactly into the output stream, so skip the
     310             :          * preamble as it would not fit in there. This is the case for dts
     311             :          * discs and dts-in-wav. */
     312           0 :         ctx->use_preamble = 0;
     313           0 :     } else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) {
     314           0 :         avpriv_request_sample(s, "Unrecognized large DTS frame");
     315             :         /* This will fail with a "bitrate too high" in the caller */
     316             :     }
     317             : 
     318           0 :     return 0;
     319             : }
     320             : 
     321             : static const enum IEC61937DataType mpeg_data_type[2][3] = {
     322             :     //     LAYER1                      LAYER2                  LAYER3
     323             :     { IEC61937_MPEG2_LAYER1_LSF, IEC61937_MPEG2_LAYER2_LSF, IEC61937_MPEG2_LAYER3_LSF }, // MPEG-2 LSF
     324             :     { IEC61937_MPEG1_LAYER1,     IEC61937_MPEG1_LAYER23,    IEC61937_MPEG1_LAYER23 },    // MPEG-1
     325             : };
     326             : 
     327           0 : static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt)
     328             : {
     329           0 :     IEC61937Context *ctx = s->priv_data;
     330           0 :     int version =      (pkt->data[1] >> 3) & 3;
     331           0 :     int layer   = 3 - ((pkt->data[1] >> 1) & 3);
     332           0 :     int extension = pkt->data[2] & 1;
     333             : 
     334           0 :     if (layer == 3 || version == 1) {
     335           0 :         av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n");
     336           0 :         return AVERROR_INVALIDDATA;
     337             :     }
     338           0 :     av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension);
     339           0 :     if (version == 2 && extension) {
     340           0 :         ctx->data_type  = IEC61937_MPEG2_EXT;
     341           0 :         ctx->pkt_offset = 4608;
     342             :     } else {
     343           0 :         ctx->data_type  = mpeg_data_type [version & 1][layer];
     344           0 :         ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer];
     345             :     }
     346             :     // TODO Data type dependent info (normal/karaoke, dynamic range control)
     347           0 :     return 0;
     348             : }
     349             : 
     350           0 : static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt)
     351             : {
     352           0 :     IEC61937Context *ctx = s->priv_data;
     353             :     uint32_t samples;
     354             :     uint8_t frames;
     355             :     int ret;
     356             : 
     357           0 :     ret = av_adts_header_parse(pkt->data, &samples, &frames);
     358           0 :     if (ret < 0) {
     359           0 :         av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n");
     360           0 :         return ret;
     361             :     }
     362             : 
     363           0 :     ctx->pkt_offset = samples << 2;
     364           0 :     switch (frames) {
     365           0 :     case 1:
     366           0 :         ctx->data_type = IEC61937_MPEG2_AAC;
     367           0 :         break;
     368           0 :     case 2:
     369           0 :         ctx->data_type = IEC61937_MPEG2_AAC_LSF_2048;
     370           0 :         break;
     371           0 :     case 4:
     372           0 :         ctx->data_type = IEC61937_MPEG2_AAC_LSF_4096;
     373           0 :         break;
     374           0 :     default:
     375           0 :         av_log(s, AV_LOG_ERROR,
     376             :                "%"PRIu32" samples in AAC frame not supported\n", samples);
     377           0 :         return AVERROR(EINVAL);
     378             :     }
     379             :     //TODO Data type dependent info (LC profile/SBR)
     380           0 :     return 0;
     381             : }
     382             : 
     383             : 
     384             : /*
     385             :  * It seems Dolby TrueHD frames have to be encapsulated in MAT frames before
     386             :  * they can be encapsulated in IEC 61937.
     387             :  * Here we encapsulate 24 TrueHD frames in a single MAT frame, padding them
     388             :  * to achieve constant rate.
     389             :  * The actual format of a MAT frame is unknown, but the below seems to work.
     390             :  * However, it seems it is not actually necessary for the 24 TrueHD frames to
     391             :  * be in an exact alignment with the MAT frame.
     392             :  */
     393             : #define MAT_FRAME_SIZE          61424
     394             : #define TRUEHD_FRAME_OFFSET     2560
     395             : #define MAT_MIDDLE_CODE_OFFSET  -4
     396             : 
     397           0 : static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt)
     398             : {
     399           0 :     IEC61937Context *ctx = s->priv_data;
     400           0 :     int mat_code_length = 0;
     401             :     static const char mat_end_code[16] = { 0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11 };
     402             : 
     403           0 :     if (!ctx->hd_buf_count) {
     404             :         static 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 };
     405           0 :         mat_code_length = sizeof(mat_start_code) + BURST_HEADER_SIZE;
     406           0 :         memcpy(ctx->hd_buf, mat_start_code, sizeof(mat_start_code));
     407             : 
     408           0 :     } else if (ctx->hd_buf_count == 12) {
     409             :         static const char mat_middle_code[12] = { 0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0 };
     410           0 :         mat_code_length = sizeof(mat_middle_code) + MAT_MIDDLE_CODE_OFFSET;
     411           0 :         memcpy(&ctx->hd_buf[12 * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + MAT_MIDDLE_CODE_OFFSET],
     412             :                mat_middle_code, sizeof(mat_middle_code));
     413             :     }
     414             : 
     415           0 :     if (pkt->size > TRUEHD_FRAME_OFFSET - mat_code_length) {
     416             :         /* if such frames exist, we'd need some more complex logic to
     417             :          * distribute the TrueHD frames in the MAT frame */
     418           0 :         avpriv_request_sample(s, "Too large TrueHD frame of %d bytes",
     419             :                               pkt->size);
     420           0 :         return AVERROR_PATCHWELCOME;
     421             :     }
     422             : 
     423           0 :     memcpy(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length],
     424           0 :            pkt->data, pkt->size);
     425           0 :     memset(&ctx->hd_buf[ctx->hd_buf_count * TRUEHD_FRAME_OFFSET - BURST_HEADER_SIZE + mat_code_length + pkt->size],
     426           0 :            0, TRUEHD_FRAME_OFFSET - pkt->size - mat_code_length);
     427             : 
     428           0 :     if (++ctx->hd_buf_count < 24){
     429           0 :         ctx->pkt_offset = 0;
     430           0 :         return 0;
     431             :     }
     432           0 :     memcpy(&ctx->hd_buf[MAT_FRAME_SIZE - sizeof(mat_end_code)], mat_end_code, sizeof(mat_end_code));
     433           0 :     ctx->hd_buf_count = 0;
     434             : 
     435           0 :     ctx->data_type   = IEC61937_TRUEHD;
     436           0 :     ctx->pkt_offset  = 61440;
     437           0 :     ctx->out_buf     = ctx->hd_buf;
     438           0 :     ctx->out_bytes   = MAT_FRAME_SIZE;
     439           0 :     ctx->length_code = MAT_FRAME_SIZE;
     440           0 :     return 0;
     441             : }
     442             : 
     443           0 : static int spdif_write_header(AVFormatContext *s)
     444             : {
     445           0 :     IEC61937Context *ctx = s->priv_data;
     446             : 
     447           0 :     switch (s->streams[0]->codecpar->codec_id) {
     448           0 :     case AV_CODEC_ID_AC3:
     449           0 :         ctx->header_info = spdif_header_ac3;
     450           0 :         break;
     451           0 :     case AV_CODEC_ID_EAC3:
     452           0 :         ctx->header_info = spdif_header_eac3;
     453           0 :         break;
     454           0 :     case AV_CODEC_ID_MP1:
     455             :     case AV_CODEC_ID_MP2:
     456             :     case AV_CODEC_ID_MP3:
     457           0 :         ctx->header_info = spdif_header_mpeg;
     458           0 :         break;
     459           0 :     case AV_CODEC_ID_DTS:
     460           0 :         ctx->header_info = spdif_header_dts;
     461           0 :         break;
     462           0 :     case AV_CODEC_ID_AAC:
     463           0 :         ctx->header_info = spdif_header_aac;
     464           0 :         break;
     465           0 :     case AV_CODEC_ID_TRUEHD:
     466             :     case AV_CODEC_ID_MLP:
     467           0 :         ctx->header_info = spdif_header_truehd;
     468           0 :         ctx->hd_buf = av_malloc(MAT_FRAME_SIZE);
     469           0 :         if (!ctx->hd_buf)
     470           0 :             return AVERROR(ENOMEM);
     471           0 :         break;
     472           0 :     default:
     473           0 :         avpriv_report_missing_feature(s, "Codec %d",
     474           0 :                                       s->streams[0]->codecpar->codec_id);
     475           0 :         return AVERROR_PATCHWELCOME;
     476             :     }
     477           0 :     return 0;
     478             : }
     479             : 
     480           0 : static int spdif_write_trailer(AVFormatContext *s)
     481             : {
     482           0 :     IEC61937Context *ctx = s->priv_data;
     483           0 :     av_freep(&ctx->buffer);
     484           0 :     av_freep(&ctx->hd_buf);
     485           0 :     return 0;
     486             : }
     487             : 
     488           0 : static av_always_inline void spdif_put_16(IEC61937Context *ctx,
     489             :                                           AVIOContext *pb, unsigned int val)
     490             : {
     491           0 :     if (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)
     492           0 :         avio_wb16(pb, val);
     493             :     else
     494           0 :         avio_wl16(pb, val);
     495           0 : }
     496             : 
     497           0 : static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt)
     498             : {
     499           0 :     IEC61937Context *ctx = s->priv_data;
     500             :     int ret, padding;
     501             : 
     502           0 :     ctx->out_buf = pkt->data;
     503           0 :     ctx->out_bytes = pkt->size;
     504           0 :     ctx->length_code = FFALIGN(pkt->size, 2) << 3;
     505           0 :     ctx->use_preamble = 1;
     506           0 :     ctx->extra_bswap = 0;
     507             : 
     508           0 :     ret = ctx->header_info(s, pkt);
     509           0 :     if (ret < 0)
     510           0 :         return ret;
     511           0 :     if (!ctx->pkt_offset)
     512           0 :         return 0;
     513             : 
     514           0 :     padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1;
     515           0 :     if (padding < 0) {
     516           0 :         av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
     517           0 :         return AVERROR(EINVAL);
     518             :     }
     519             : 
     520           0 :     if (ctx->use_preamble) {
     521           0 :         spdif_put_16(ctx, s->pb, SYNCWORD1);       //Pa
     522           0 :         spdif_put_16(ctx, s->pb, SYNCWORD2);       //Pb
     523           0 :         spdif_put_16(ctx, s->pb, ctx->data_type);  //Pc
     524           0 :         spdif_put_16(ctx, s->pb, ctx->length_code);//Pd
     525             :     }
     526             : 
     527           0 :     if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) {
     528           0 :         avio_write(s->pb, ctx->out_buf, ctx->out_bytes & ~1);
     529             :     } else {
     530           0 :         av_fast_malloc(&ctx->buffer, &ctx->buffer_size, ctx->out_bytes + AV_INPUT_BUFFER_PADDING_SIZE);
     531           0 :         if (!ctx->buffer)
     532           0 :             return AVERROR(ENOMEM);
     533           0 :         ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)ctx->out_buf, ctx->out_bytes >> 1);
     534           0 :         avio_write(s->pb, ctx->buffer, ctx->out_bytes & ~1);
     535             :     }
     536             : 
     537             :     /* a final lone byte has to be MSB aligned */
     538           0 :     if (ctx->out_bytes & 1)
     539           0 :         spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8);
     540             : 
     541           0 :     ffio_fill(s->pb, 0, padding);
     542             : 
     543           0 :     av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
     544           0 :            ctx->data_type, ctx->out_bytes, ctx->pkt_offset);
     545             : 
     546           0 :     return 0;
     547             : }
     548             : 
     549             : AVOutputFormat ff_spdif_muxer = {
     550             :     .name              = "spdif",
     551             :     .long_name         = NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"),
     552             :     .extensions        = "spdif",
     553             :     .priv_data_size    = sizeof(IEC61937Context),
     554             :     .audio_codec       = AV_CODEC_ID_AC3,
     555             :     .video_codec       = AV_CODEC_ID_NONE,
     556             :     .write_header      = spdif_write_header,
     557             :     .write_packet      = spdif_write_packet,
     558             :     .write_trailer     = spdif_write_trailer,
     559             :     .flags             = AVFMT_NOTIMESTAMPS,
     560             :     .priv_class        = &spdif_class,
     561             : };

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