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689 lines
24 KiB
689 lines
24 KiB
/* |
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* IEC 61937 muxer |
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* Copyright (c) 2009 Bartlomiej Wolowiec |
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* Copyright (c) 2010, 2020 Anssi Hannula |
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* Copyright (c) 2010 Carl Eugen Hoyos |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file |
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* IEC-61937 encapsulation of various formats, used by S/PDIF |
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* @author Bartlomiej Wolowiec |
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* @author Anssi Hannula |
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* @author Carl Eugen Hoyos |
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*/ |
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|
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/* |
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* Terminology used in specification: |
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* data-burst - IEC61937 frame, contains header and encapsuled frame |
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* burst-preamble - IEC61937 frame header, contains 16-bit words named Pa, Pb, Pc and Pd |
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* burst-payload - encapsuled frame |
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* Pa, Pb - syncword - 0xF872, 0x4E1F |
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* Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12) |
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* and bitstream number (bits 13-15) |
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* data-type - determines type of encapsuled frames |
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* Pd - length code (number of bits or bytes of encapsuled frame - according to data_type) |
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* |
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* IEC 61937 frames at normal usage start every specific count of bytes, |
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* dependent from data-type (spaces between packets are filled by zeros) |
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*/ |
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#include <inttypes.h> |
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|
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#include "avformat.h" |
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#include "avio_internal.h" |
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#include "mux.h" |
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#include "spdif.h" |
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#include "libavcodec/ac3defs.h" |
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#include "libavcodec/adts_parser.h" |
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#include "libavcodec/dca.h" |
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#include "libavcodec/dca_syncwords.h" |
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#include "libavutil/opt.h" |
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typedef struct IEC61937Context { |
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const AVClass *av_class; |
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enum IEC61937DataType data_type;///< burst info - reference to type of payload of the data-burst |
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int length_code; ///< length code in bits or bytes, depending on data type |
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int pkt_offset; ///< data burst repetition period in bytes |
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uint8_t *buffer; ///< allocated buffer, used for swap bytes |
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int buffer_size; ///< size of allocated buffer |
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const uint8_t *out_buf; ///< pointer to the outgoing data before byte-swapping |
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int out_bytes; ///< amount of outgoing bytes |
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int use_preamble; ///< preamble enabled (disabled for exactly pre-padded DTS) |
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int extra_bswap; ///< extra bswap for payload (for LE DTS => standard BE DTS) |
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uint8_t *hd_buf[2]; ///< allocated buffers to concatenate hd audio frames |
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int hd_buf_size; ///< size of the hd audio buffer (eac3, dts4) |
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int hd_buf_count; ///< number of frames in the hd audio buffer (eac3) |
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int hd_buf_filled; ///< amount of bytes in the hd audio buffer (eac3, truehd) |
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int hd_buf_idx; ///< active hd buffer index (truehd) |
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int dtshd_skip; ///< counter used for skipping DTS-HD frames |
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uint16_t truehd_prev_time; ///< input_timing from the last frame |
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int truehd_prev_size; ///< previous frame size in bytes, including any MAT codes |
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int truehd_samples_per_frame; ///< samples per frame for padding calculation |
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/* AVOptions: */ |
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int dtshd_rate; |
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int dtshd_fallback; |
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#define SPDIF_FLAG_BIGENDIAN 0x01 |
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int spdif_flags; |
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|
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/// function, which generates codec dependent header information. |
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/// Sets data_type and pkt_offset, and length_code, out_bytes, out_buf if necessary |
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int (*header_info) (AVFormatContext *s, AVPacket *pkt); |
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} IEC61937Context; |
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static const AVOption options[] = { |
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{ "spdif_flags", "IEC 61937 encapsulation flags", offsetof(IEC61937Context, spdif_flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM, .unit = "spdif_flags" }, |
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{ "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, .unit = "spdif_flags" }, |
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{ "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 }, |
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{ "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 }, |
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{ NULL }, |
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}; |
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static const AVClass spdif_class = { |
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.class_name = "spdif", |
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.item_name = av_default_item_name, |
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.option = options, |
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.version = LIBAVUTIL_VERSION_INT, |
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}; |
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static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt) |
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{ |
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IEC61937Context *ctx = s->priv_data; |
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int bitstream_mode = pkt->data[5] & 0x7; |
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ctx->data_type = IEC61937_AC3 | (bitstream_mode << 8); |
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ctx->pkt_offset = AC3_FRAME_SIZE << 2; |
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return 0; |
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} |
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static int spdif_header_eac3(AVFormatContext *s, AVPacket *pkt) |
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{ |
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IEC61937Context *ctx = s->priv_data; |
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static const uint8_t eac3_repeat[4] = {6, 3, 2, 1}; |
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int repeat = 1; |
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uint8_t *tmp; |
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int bsid = pkt->data[5] >> 3; |
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if (bsid > 10 && (pkt->data[4] & 0xc0) != 0xc0) /* fscod */ |
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repeat = eac3_repeat[(pkt->data[4] & 0x30) >> 4]; /* numblkscod */ |
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tmp = av_fast_realloc(ctx->hd_buf[0], &ctx->hd_buf_size, ctx->hd_buf_filled + pkt->size); |
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if (!tmp) |
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return AVERROR(ENOMEM); |
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ctx->hd_buf[0] = tmp; |
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memcpy(&ctx->hd_buf[0][ctx->hd_buf_filled], pkt->data, pkt->size); |
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ctx->hd_buf_filled += pkt->size; |
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if (++ctx->hd_buf_count < repeat){ |
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ctx->pkt_offset = 0; |
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return 0; |
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} |
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ctx->data_type = IEC61937_EAC3; |
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ctx->pkt_offset = 24576; |
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ctx->out_buf = ctx->hd_buf[0]; |
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ctx->out_bytes = ctx->hd_buf_filled; |
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ctx->length_code = ctx->hd_buf_filled; |
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ctx->hd_buf_count = 0; |
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ctx->hd_buf_filled = 0; |
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return 0; |
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} |
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/* |
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* DTS type IV (DTS-HD) can be transmitted with various frame repetition |
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* periods; longer repetition periods allow for longer packets and therefore |
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* higher bitrate. Longer repetition periods mean that the constant bitrate of |
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* the output IEC 61937 stream is higher. |
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* The repetition period is measured in IEC 60958 frames (4 bytes). |
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*/ |
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static int spdif_dts4_subtype(int period) |
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{ |
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switch (period) { |
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case 512: return 0x0; |
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case 1024: return 0x1; |
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case 2048: return 0x2; |
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case 4096: return 0x3; |
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case 8192: return 0x4; |
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case 16384: return 0x5; |
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} |
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return -1; |
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} |
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static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size, |
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int sample_rate, int blocks) |
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{ |
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IEC61937Context *ctx = s->priv_data; |
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static const char dtshd_start_code[10] = { 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xfe, 0xfe }; |
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int pkt_size = pkt->size; |
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int period; |
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int subtype; |
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if (!core_size) { |
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av_log(s, AV_LOG_ERROR, "HD mode not supported for this format\n"); |
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return AVERROR(EINVAL); |
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} |
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if (!sample_rate) { |
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av_log(s, AV_LOG_ERROR, "Unknown DTS sample rate for HD\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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period = ctx->dtshd_rate * (blocks << 5) / sample_rate; |
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subtype = spdif_dts4_subtype(period); |
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if (subtype < 0) { |
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av_log(s, AV_LOG_ERROR, "Specified HD rate of %d Hz would require an " |
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"impossible repetition period of %d for the current DTS stream" |
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" (blocks = %d, sample rate = %d)\n", ctx->dtshd_rate, period, |
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blocks << 5, sample_rate); |
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return AVERROR(EINVAL); |
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} |
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/* set pkt_offset and DTS IV subtype according to the requested output |
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* rate */ |
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ctx->pkt_offset = period * 4; |
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ctx->data_type = IEC61937_DTSHD | subtype << 8; |
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/* If the bitrate is too high for transmitting at the selected |
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* repetition period setting, strip DTS-HD until a good amount |
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* of consecutive non-overflowing HD frames have been observed. |
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* This generally only happens if the caller is cramming a Master |
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* Audio stream into 192kHz IEC 60958 (which may or may not fit). */ |
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if (sizeof(dtshd_start_code) + 2 + pkt_size |
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> ctx->pkt_offset - BURST_HEADER_SIZE && core_size) { |
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if (!ctx->dtshd_skip) |
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av_log(s, AV_LOG_WARNING, "DTS-HD bitrate too high, " |
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"temporarily sending core only\n"); |
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if (ctx->dtshd_fallback > 0) |
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ctx->dtshd_skip = sample_rate * ctx->dtshd_fallback / (blocks << 5); |
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else |
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/* skip permanently (dtshd_fallback == -1) or just once |
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* (dtshd_fallback == 0) */ |
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ctx->dtshd_skip = 1; |
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} |
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if (ctx->dtshd_skip && core_size) { |
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pkt_size = core_size; |
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if (ctx->dtshd_fallback >= 0) |
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--ctx->dtshd_skip; |
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} |
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ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size; |
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/* Align so that (length_code & 0xf) == 0x8. This is reportedly needed |
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* with some receivers, but the exact requirement is unconfirmed. */ |
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ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8; |
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av_fast_malloc(&ctx->hd_buf[0], &ctx->hd_buf_size, ctx->out_bytes); |
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if (!ctx->hd_buf[0]) |
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return AVERROR(ENOMEM); |
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ctx->out_buf = ctx->hd_buf[0]; |
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memcpy(ctx->hd_buf[0], dtshd_start_code, sizeof(dtshd_start_code)); |
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AV_WB16(ctx->hd_buf[0] + sizeof(dtshd_start_code), pkt_size); |
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memcpy(ctx->hd_buf[0] + sizeof(dtshd_start_code) + 2, pkt->data, pkt_size); |
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return 0; |
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} |
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static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt) |
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{ |
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IEC61937Context *ctx = s->priv_data; |
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uint32_t syncword_dts = AV_RB32(pkt->data); |
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int blocks; |
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int sample_rate = 0; |
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int core_size = 0; |
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if (pkt->size < 9) |
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return AVERROR_INVALIDDATA; |
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switch (syncword_dts) { |
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case DCA_SYNCWORD_CORE_BE: |
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blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f; |
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core_size = ((AV_RB24(pkt->data + 5) >> 4) & 0x3fff) + 1; |
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sample_rate = ff_dca_sample_rates[(pkt->data[8] >> 2) & 0x0f]; |
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break; |
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case DCA_SYNCWORD_CORE_LE: |
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blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f; |
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ctx->extra_bswap = 1; |
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break; |
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case DCA_SYNCWORD_CORE_14B_BE: |
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blocks = |
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(((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2)); |
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break; |
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case DCA_SYNCWORD_CORE_14B_LE: |
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blocks = |
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(((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2)); |
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ctx->extra_bswap = 1; |
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break; |
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case DCA_SYNCWORD_SUBSTREAM: |
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/* We only handle HD frames that are paired with core. However, |
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sometimes DTS-HD streams with core have a stray HD frame without |
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core in the beginning of the stream. */ |
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av_log(s, AV_LOG_ERROR, "stray DTS-HD frame\n"); |
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return AVERROR_INVALIDDATA; |
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default: |
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av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%"PRIx32"\n", syncword_dts); |
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return AVERROR_INVALIDDATA; |
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} |
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blocks++; |
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if (ctx->dtshd_rate) |
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/* DTS type IV output requested */ |
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return spdif_header_dts4(s, pkt, core_size, sample_rate, blocks); |
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switch (blocks) { |
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case 512 >> 5: ctx->data_type = IEC61937_DTS1; break; |
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case 1024 >> 5: ctx->data_type = IEC61937_DTS2; break; |
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case 2048 >> 5: ctx->data_type = IEC61937_DTS3; break; |
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default: |
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av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n", |
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blocks << 5); |
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return AVERROR(ENOSYS); |
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} |
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/* discard extraneous data by default */ |
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if (core_size && core_size < pkt->size) { |
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ctx->out_bytes = core_size; |
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ctx->length_code = core_size << 3; |
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} |
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ctx->pkt_offset = blocks << 7; |
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if (ctx->out_bytes == ctx->pkt_offset) { |
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/* The DTS stream fits exactly into the output stream, so skip the |
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* preamble as it would not fit in there. This is the case for dts |
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* discs and dts-in-wav. */ |
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ctx->use_preamble = 0; |
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} else if (ctx->out_bytes > ctx->pkt_offset - BURST_HEADER_SIZE) { |
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avpriv_request_sample(s, "Unrecognized large DTS frame"); |
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/* This will fail with a "bitrate too high" in the caller */ |
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} |
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return 0; |
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} |
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static const enum IEC61937DataType mpeg_data_type[2][3] = { |
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// LAYER1 LAYER2 LAYER3 |
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{ IEC61937_MPEG2_LAYER1_LSF, IEC61937_MPEG2_LAYER2_LSF, IEC61937_MPEG2_LAYER3_LSF }, // MPEG-2 LSF |
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{ IEC61937_MPEG1_LAYER1, IEC61937_MPEG1_LAYER23, IEC61937_MPEG1_LAYER23 }, // MPEG-1 |
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}; |
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static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt) |
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{ |
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IEC61937Context *ctx = s->priv_data; |
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int version = (pkt->data[1] >> 3) & 3; |
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int layer = 3 - ((pkt->data[1] >> 1) & 3); |
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int extension = pkt->data[2] & 1; |
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if (layer == 3 || version == 1) { |
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av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension); |
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if (version == 2 && extension) { |
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ctx->data_type = IEC61937_MPEG2_EXT; |
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ctx->pkt_offset = 4608; |
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} else { |
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ctx->data_type = mpeg_data_type [version & 1][layer]; |
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ctx->pkt_offset = spdif_mpeg_pkt_offset[version & 1][layer]; |
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} |
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// TODO Data type dependent info (normal/karaoke, dynamic range control) |
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return 0; |
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} |
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static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt) |
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{ |
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IEC61937Context *ctx = s->priv_data; |
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uint32_t samples; |
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uint8_t frames; |
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int ret; |
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ret = av_adts_header_parse(pkt->data, &samples, &frames); |
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if (ret < 0) { |
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av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n"); |
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return ret; |
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} |
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ctx->pkt_offset = samples << 2; |
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switch (frames) { |
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case 1: |
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ctx->data_type = IEC61937_MPEG2_AAC; |
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break; |
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case 2: |
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ctx->data_type = IEC61937_MPEG2_AAC_LSF_2048; |
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break; |
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case 4: |
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ctx->data_type = IEC61937_MPEG2_AAC_LSF_4096; |
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break; |
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default: |
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av_log(s, AV_LOG_ERROR, |
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"%"PRIu32" samples in AAC frame not supported\n", samples); |
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return AVERROR(EINVAL); |
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} |
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//TODO Data type dependent info (LC profile/SBR) |
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return 0; |
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} |
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/* |
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* It seems Dolby TrueHD frames have to be encapsulated in MAT frames before |
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* they can be encapsulated in IEC 61937. |
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*/ |
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#define MAT_PKT_OFFSET 61440 |
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#define MAT_FRAME_SIZE 61424 |
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static const uint8_t mat_start_code[20] = { |
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0x07, 0x9E, 0x00, 0x03, 0x84, 0x01, 0x01, 0x01, 0x80, 0x00, 0x56, 0xA5, 0x3B, 0xF4, 0x81, 0x83, |
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0x49, 0x80, 0x77, 0xE0, |
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}; |
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static const uint8_t mat_middle_code[12] = { |
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0xC3, 0xC1, 0x42, 0x49, 0x3B, 0xFA, 0x82, 0x83, 0x49, 0x80, 0x77, 0xE0, |
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}; |
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static const uint8_t mat_end_code[16] = { |
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0xC3, 0xC2, 0xC0, 0xC4, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x97, 0x11, |
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}; |
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#define MAT_CODE(position, data) { .pos = position, .code = data, .len = sizeof(data) } |
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|
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static const struct { |
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unsigned int pos; |
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unsigned int len; |
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const uint8_t *code; |
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} mat_codes[] = { |
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MAT_CODE(0, mat_start_code), |
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MAT_CODE(30708, mat_middle_code), |
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MAT_CODE(MAT_FRAME_SIZE - sizeof(mat_end_code), mat_end_code), |
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}; |
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static int spdif_header_truehd(AVFormatContext *s, AVPacket *pkt) |
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{ |
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IEC61937Context *ctx = s->priv_data; |
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uint8_t *hd_buf = ctx->hd_buf[ctx->hd_buf_idx]; |
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int ratebits; |
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int padding_remaining = 0; |
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uint16_t input_timing; |
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int total_frame_size = pkt->size; |
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const uint8_t *dataptr = pkt->data; |
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int data_remaining = pkt->size; |
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int have_pkt = 0; |
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int next_code_idx; |
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if (pkt->size < 10) |
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return AVERROR_INVALIDDATA; |
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if (AV_RB24(pkt->data + 4) == 0xf8726f) { |
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/* major sync unit, fetch sample rate */ |
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if (pkt->data[7] == 0xba) |
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ratebits = pkt->data[8] >> 4; |
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else if (pkt->data[7] == 0xbb) |
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ratebits = pkt->data[9] >> 4; |
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else |
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return AVERROR_INVALIDDATA; |
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ctx->truehd_samples_per_frame = 40 << (ratebits & 3); |
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av_log(s, AV_LOG_TRACE, "TrueHD samples per frame: %d\n", |
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ctx->truehd_samples_per_frame); |
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} |
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|
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if (!ctx->truehd_samples_per_frame) |
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return AVERROR_INVALIDDATA; |
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|
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input_timing = AV_RB16(pkt->data + 2); |
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if (ctx->truehd_prev_size) { |
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uint16_t delta_samples = input_timing - ctx->truehd_prev_time; |
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/* |
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* One multiple-of-48kHz frame is 1/1200 sec and the IEC 61937 rate |
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* is 768kHz = 768000*4 bytes/sec. |
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* The nominal space per frame is therefore |
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* (768000*4 bytes/sec) * (1/1200 sec) = 2560 bytes. |
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* For multiple-of-44.1kHz frames: 1/1102.5 sec, 705.6kHz, 2560 bytes. |
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* |
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* 2560 is divisible by truehd_samples_per_frame. |
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*/ |
|
int delta_bytes = delta_samples * 2560 / ctx->truehd_samples_per_frame; |
|
|
|
/* padding needed before this frame */ |
|
padding_remaining = delta_bytes - ctx->truehd_prev_size; |
|
|
|
av_log(s, AV_LOG_TRACE, "delta_samples: %"PRIu16", delta_bytes: %d\n", |
|
delta_samples, delta_bytes); |
|
|
|
/* sanity check */ |
|
if (padding_remaining < 0 || padding_remaining >= MAT_FRAME_SIZE / 2) { |
|
avpriv_request_sample(s, "Unusual frame timing: %"PRIu16" => %"PRIu16", %d samples/frame", |
|
ctx->truehd_prev_time, input_timing, ctx->truehd_samples_per_frame); |
|
padding_remaining = 0; |
|
} |
|
} |
|
|
|
for (next_code_idx = 0; next_code_idx < FF_ARRAY_ELEMS(mat_codes); next_code_idx++) |
|
if (ctx->hd_buf_filled <= mat_codes[next_code_idx].pos) |
|
break; |
|
|
|
if (next_code_idx >= FF_ARRAY_ELEMS(mat_codes)) |
|
return AVERROR_BUG; |
|
|
|
while (padding_remaining || data_remaining || |
|
mat_codes[next_code_idx].pos == ctx->hd_buf_filled) { |
|
|
|
if (mat_codes[next_code_idx].pos == ctx->hd_buf_filled) { |
|
/* time to insert MAT code */ |
|
int code_len = mat_codes[next_code_idx].len; |
|
int code_len_remaining = code_len; |
|
memcpy(hd_buf + mat_codes[next_code_idx].pos, |
|
mat_codes[next_code_idx].code, code_len); |
|
ctx->hd_buf_filled += code_len; |
|
|
|
next_code_idx++; |
|
if (next_code_idx == FF_ARRAY_ELEMS(mat_codes)) { |
|
next_code_idx = 0; |
|
|
|
/* this was the last code, move to the next MAT frame */ |
|
have_pkt = 1; |
|
ctx->out_buf = hd_buf; |
|
ctx->hd_buf_idx ^= 1; |
|
hd_buf = ctx->hd_buf[ctx->hd_buf_idx]; |
|
ctx->hd_buf_filled = 0; |
|
|
|
/* inter-frame gap has to be counted as well, add it */ |
|
code_len_remaining += MAT_PKT_OFFSET - MAT_FRAME_SIZE; |
|
} |
|
|
|
if (padding_remaining) { |
|
/* consider the MAT code as padding */ |
|
int counted_as_padding = FFMIN(padding_remaining, |
|
code_len_remaining); |
|
padding_remaining -= counted_as_padding; |
|
code_len_remaining -= counted_as_padding; |
|
} |
|
/* count the remainder of the code as part of frame size */ |
|
if (code_len_remaining) |
|
total_frame_size += code_len_remaining; |
|
} |
|
|
|
if (padding_remaining) { |
|
int padding_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled, |
|
padding_remaining); |
|
|
|
memset(hd_buf + ctx->hd_buf_filled, 0, padding_to_insert); |
|
ctx->hd_buf_filled += padding_to_insert; |
|
padding_remaining -= padding_to_insert; |
|
|
|
if (padding_remaining) |
|
continue; /* time to insert MAT code */ |
|
} |
|
|
|
if (data_remaining) { |
|
int data_to_insert = FFMIN(mat_codes[next_code_idx].pos - ctx->hd_buf_filled, |
|
data_remaining); |
|
|
|
memcpy(hd_buf + ctx->hd_buf_filled, dataptr, data_to_insert); |
|
ctx->hd_buf_filled += data_to_insert; |
|
dataptr += data_to_insert; |
|
data_remaining -= data_to_insert; |
|
} |
|
} |
|
|
|
ctx->truehd_prev_size = total_frame_size; |
|
ctx->truehd_prev_time = input_timing; |
|
|
|
av_log(s, AV_LOG_TRACE, "TrueHD frame inserted, total size %d, buffer position %d\n", |
|
total_frame_size, ctx->hd_buf_filled); |
|
|
|
if (!have_pkt) { |
|
ctx->pkt_offset = 0; |
|
return 0; |
|
} |
|
|
|
ctx->data_type = IEC61937_TRUEHD; |
|
ctx->pkt_offset = MAT_PKT_OFFSET; |
|
ctx->out_bytes = MAT_FRAME_SIZE; |
|
ctx->length_code = MAT_FRAME_SIZE; |
|
return 0; |
|
} |
|
|
|
static int spdif_write_header(AVFormatContext *s) |
|
{ |
|
IEC61937Context *ctx = s->priv_data; |
|
|
|
switch (s->streams[0]->codecpar->codec_id) { |
|
case AV_CODEC_ID_AC3: |
|
ctx->header_info = spdif_header_ac3; |
|
break; |
|
case AV_CODEC_ID_EAC3: |
|
ctx->header_info = spdif_header_eac3; |
|
break; |
|
case AV_CODEC_ID_MP1: |
|
case AV_CODEC_ID_MP2: |
|
case AV_CODEC_ID_MP3: |
|
ctx->header_info = spdif_header_mpeg; |
|
break; |
|
case AV_CODEC_ID_DTS: |
|
ctx->header_info = spdif_header_dts; |
|
break; |
|
case AV_CODEC_ID_AAC: |
|
ctx->header_info = spdif_header_aac; |
|
break; |
|
case AV_CODEC_ID_TRUEHD: |
|
case AV_CODEC_ID_MLP: |
|
ctx->header_info = spdif_header_truehd; |
|
for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++) { |
|
ctx->hd_buf[i] = av_malloc(MAT_FRAME_SIZE); |
|
if (!ctx->hd_buf[i]) |
|
return AVERROR(ENOMEM); |
|
} |
|
break; |
|
default: |
|
avpriv_report_missing_feature(s, "Codec %d", |
|
s->streams[0]->codecpar->codec_id); |
|
return AVERROR_PATCHWELCOME; |
|
} |
|
return 0; |
|
} |
|
|
|
static void spdif_deinit(AVFormatContext *s) |
|
{ |
|
IEC61937Context *ctx = s->priv_data; |
|
av_freep(&ctx->buffer); |
|
for (int i = 0; i < FF_ARRAY_ELEMS(ctx->hd_buf); i++) |
|
av_freep(&ctx->hd_buf[i]); |
|
} |
|
|
|
static av_always_inline void spdif_put_16(IEC61937Context *ctx, |
|
AVIOContext *pb, unsigned int val) |
|
{ |
|
if (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN) |
|
avio_wb16(pb, val); |
|
else |
|
avio_wl16(pb, val); |
|
} |
|
|
|
static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt) |
|
{ |
|
IEC61937Context *ctx = s->priv_data; |
|
int ret, padding; |
|
|
|
ctx->out_buf = pkt->data; |
|
ctx->out_bytes = pkt->size; |
|
ctx->length_code = FFALIGN(pkt->size, 2) << 3; |
|
ctx->use_preamble = 1; |
|
ctx->extra_bswap = 0; |
|
|
|
ret = ctx->header_info(s, pkt); |
|
if (ret < 0) |
|
return ret; |
|
if (!ctx->pkt_offset) |
|
return 0; |
|
|
|
padding = (ctx->pkt_offset - ctx->use_preamble * BURST_HEADER_SIZE - ctx->out_bytes) & ~1; |
|
if (padding < 0) { |
|
av_log(s, AV_LOG_ERROR, "bitrate is too high\n"); |
|
return AVERROR(EINVAL); |
|
} |
|
|
|
if (ctx->use_preamble) { |
|
spdif_put_16(ctx, s->pb, SYNCWORD1); //Pa |
|
spdif_put_16(ctx, s->pb, SYNCWORD2); //Pb |
|
spdif_put_16(ctx, s->pb, ctx->data_type); //Pc |
|
spdif_put_16(ctx, s->pb, ctx->length_code);//Pd |
|
} |
|
|
|
if (ctx->extra_bswap ^ (ctx->spdif_flags & SPDIF_FLAG_BIGENDIAN)) { |
|
avio_write(s->pb, ctx->out_buf, ctx->out_bytes & ~1); |
|
} else { |
|
av_fast_malloc(&ctx->buffer, &ctx->buffer_size, ctx->out_bytes + AV_INPUT_BUFFER_PADDING_SIZE); |
|
if (!ctx->buffer) |
|
return AVERROR(ENOMEM); |
|
ff_spdif_bswap_buf16((uint16_t *)ctx->buffer, (const uint16_t *)ctx->out_buf, ctx->out_bytes >> 1); |
|
avio_write(s->pb, ctx->buffer, ctx->out_bytes & ~1); |
|
} |
|
|
|
/* a final lone byte has to be MSB aligned */ |
|
if (ctx->out_bytes & 1) |
|
spdif_put_16(ctx, s->pb, ctx->out_buf[ctx->out_bytes - 1] << 8); |
|
|
|
ffio_fill(s->pb, 0, padding); |
|
|
|
av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n", |
|
ctx->data_type, ctx->out_bytes, ctx->pkt_offset); |
|
|
|
return 0; |
|
} |
|
|
|
const FFOutputFormat ff_spdif_muxer = { |
|
.p.name = "spdif", |
|
.p.long_name = NULL_IF_CONFIG_SMALL("IEC 61937 (used on S/PDIF - IEC958)"), |
|
.p.extensions = "spdif", |
|
.priv_data_size = sizeof(IEC61937Context), |
|
.p.audio_codec = AV_CODEC_ID_AC3, |
|
.p.video_codec = AV_CODEC_ID_NONE, |
|
.write_header = spdif_write_header, |
|
.write_packet = spdif_write_packet, |
|
.deinit = spdif_deinit, |
|
.p.flags = AVFMT_NOTIMESTAMPS, |
|
.p.priv_class = &spdif_class, |
|
};
|
|
|