311 lines
10 KiB
C
311 lines
10 KiB
C
/*
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* IEC958 muxer
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* Copyright (c) 2009 Bartlomiej Wolowiec
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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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* @file libavformat/spdif.c
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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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*/
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/*
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* Terminology used in specification:
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* data-burst - IEC958 frame, contains header and encapsuled frame
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* burst-preambule - IEC958 frame header, contains 16-bits 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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* IEC958 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 "avformat.h"
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#include "libavcodec/ac3.h"
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#include "libavcodec/dca.h"
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#include "libavcodec/aac_parser.h"
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#define SYNCWORD1 0xF872
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#define SYNCWORD2 0x4E1F
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#define BURST_HEADER_SIZE 0x8
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enum IEC958DataType {
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IEC958_AC3 = 0x01, ///< AC-3 data
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IEC958_MPEG1_LAYER1 = 0x04, ///< MPEG-1 layer 1
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IEC958_MPEG1_LAYER23 = 0x05, ///< MPEG-1 layer 2 or 3 data or MPEG-2 without extension
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IEC958_MPEG2_EXT = 0x06, ///< MPEG-2 data with extension
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IEC958_MPEG2_AAC = 0x07, ///< MPEG-2 AAC ADTS
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IEC958_MPEG2_LAYER1_LSF = 0x08, ///< MPEG-2, layer-1 low sampling frequency
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IEC958_MPEG2_LAYER2_LSF = 0x09, ///< MPEG-2, layer-2 low sampling frequency
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IEC958_MPEG2_LAYER3_LSF = 0x0A, ///< MPEG-2, layer-3 low sampling frequency
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IEC958_DTS1 = 0x0B, ///< DTS type I (512 samples)
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IEC958_DTS2 = 0x0C, ///< DTS type II (1024 samples)
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IEC958_DTS3 = 0x0D, ///< DTS type III (2048 samples)
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IEC958_MPEG2_AAC_LSF_2048 = 0x13, ///< MPEG-2 AAC ADTS half-rate low sampling frequency
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IEC958_MPEG2_AAC_LSF_4096 = 0x13 | 0x20, ///< MPEG-2 AAC ADTS quarter-rate low sampling frequency
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};
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typedef struct IEC958Context {
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enum IEC958DataType data_type; ///< burst info - reference to type of payload of the data-burst
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int pkt_size; ///< length code in bits
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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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/// function, which generates codec dependent header information.
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/// Sets data_type and data_offset
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int (*header_info) (AVFormatContext *s, AVPacket *pkt);
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} IEC958Context;
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//TODO move to DSP
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static void bswap_buf16(uint16_t *dst, const uint16_t *src, int w)
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{
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int i;
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for (i = 0; i + 8 <= w; i += 8) {
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dst[i + 0] = bswap_16(src[i + 0]);
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dst[i + 1] = bswap_16(src[i + 1]);
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dst[i + 2] = bswap_16(src[i + 2]);
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dst[i + 3] = bswap_16(src[i + 3]);
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dst[i + 4] = bswap_16(src[i + 4]);
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dst[i + 5] = bswap_16(src[i + 5]);
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dst[i + 6] = bswap_16(src[i + 6]);
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dst[i + 7] = bswap_16(src[i + 7]);
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}
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for (; i < w; i++)
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dst[i + 0] = bswap_16(src[i + 0]);
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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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IEC958Context *ctx = s->priv_data;
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int bitstream_mode = pkt->data[6] & 0x7;
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ctx->data_type = IEC958_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_dts(AVFormatContext *s, AVPacket *pkt)
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{
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IEC958Context *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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switch (syncword_dts) {
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case DCA_MARKER_RAW_BE:
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blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f;
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break;
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case DCA_MARKER_RAW_LE:
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blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f;
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break;
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case DCA_MARKER_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_MARKER_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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break;
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default:
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av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%x\n", syncword_dts);
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return -1;
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}
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blocks++;
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switch (blocks) {
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case 512 >> 5: ctx->data_type = IEC958_DTS1; break;
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case 1024 >> 5: ctx->data_type = IEC958_DTS2; break;
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case 2048 >> 5: ctx->data_type = IEC958_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 -1;
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}
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ctx->pkt_offset = blocks << 7;
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return 0;
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}
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static const enum IEC958DataType mpeg_data_type[2][3] = {
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// LAYER1 LAYER2 LAYER3
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{ IEC958_MPEG2_LAYER1_LSF, IEC958_MPEG2_LAYER2_LSF, IEC958_MPEG2_LAYER3_LSF }, //MPEG2 LSF
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{ IEC958_MPEG1_LAYER1, IEC958_MPEG1_LAYER23, IEC958_MPEG1_LAYER23 }, //MPEG1
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};
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static const uint16_t mpeg_pkt_offset[2][3] = {
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//LAYER1 LAYER2 LAYER3
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{ 3072, 9216, 4608 }, // MPEG2 LSF
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{ 1536, 4608, 4608 }, // MPEG1
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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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IEC958Context *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 -1;
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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 = IEC958_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 = mpeg_pkt_offset[version & 1][layer];
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}
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// TODO Data type dependant 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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IEC958Context *ctx = s->priv_data;
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AACADTSHeaderInfo hdr;
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GetBitContext gbc;
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int ret;
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init_get_bits(&gbc, pkt->data, AAC_ADTS_HEADER_SIZE * 8);
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ret = ff_aac_parse_header(&gbc, &hdr);
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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 -1;
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}
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ctx->pkt_offset = hdr.samples << 2;
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switch (hdr.num_aac_frames) {
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case 1:
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ctx->data_type = IEC958_MPEG2_AAC;
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break;
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case 2:
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ctx->data_type = IEC958_MPEG2_AAC_LSF_2048;
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break;
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case 4:
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ctx->data_type = IEC958_MPEG2_AAC_LSF_4096;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "%i samples in AAC frame not supported\n",
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hdr.samples);
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return -1;
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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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static int spdif_write_header(AVFormatContext *s)
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{
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IEC958Context *ctx = s->priv_data;
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switch (s->streams[0]->codec->codec_id) {
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case CODEC_ID_AC3:
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ctx->header_info = spdif_header_ac3;
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break;
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case CODEC_ID_MP1:
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case CODEC_ID_MP2:
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case CODEC_ID_MP3:
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ctx->header_info = spdif_header_mpeg;
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break;
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case CODEC_ID_DTS:
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ctx->header_info = spdif_header_dts;
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break;
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case CODEC_ID_AAC:
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ctx->header_info = spdif_header_aac;
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break;
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default:
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av_log(s, AV_LOG_ERROR, "codec not supported\n");
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return -1;
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}
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put_le16(s->pb, 0);
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put_le16(s->pb, 0);
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put_le16(s->pb, 0);
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put_le16(s->pb, 0);
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return 0;
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}
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static int spdif_write_trailer(AVFormatContext *s)
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{
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IEC958Context *ctx = s->priv_data;
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av_freep(&ctx->buffer);
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return 0;
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}
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static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt)
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{
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IEC958Context *ctx = s->priv_data;
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int ret, padding;
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ctx->pkt_size = FFALIGN(pkt->size, 2) << 3;
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ret = ctx->header_info(s, pkt);
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if (ret < 0)
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return -1;
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padding = (ctx->pkt_offset - BURST_HEADER_SIZE - pkt->size) >> 1;
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if (padding < 0) {
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av_log(s, AV_LOG_ERROR, "bitrate is too high\n");
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return -1;
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}
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put_le16(s->pb, SYNCWORD1); //Pa
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put_le16(s->pb, SYNCWORD2); //Pb
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put_le16(s->pb, ctx->data_type); //Pc
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put_le16(s->pb, ctx->pkt_size); //Pd
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#if HAVE_BIGENDIAN
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put_buffer(s->pb, pkt->data, pkt->size & ~1);
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#else
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av_fast_malloc(&ctx->buffer, &ctx->buffer_size, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!ctx->buffer)
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return AVERROR(ENOMEM);
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bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)pkt->data, pkt->size >> 1);
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put_buffer(s->pb, ctx->buffer, pkt->size & ~1);
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#endif
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if (pkt->size & 1)
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put_be16(s->pb, pkt->data[pkt->size - 1]);
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for (; padding > 0; padding--)
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put_be16(s->pb, 0);
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av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n",
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ctx->data_type, pkt->size, ctx->pkt_offset);
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put_flush_packet(s->pb);
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return 0;
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}
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AVOutputFormat spdif_muxer = {
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"spdif",
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NULL_IF_CONFIG_SMALL("IEC958 - S/PDIF (IEC-61937)"),
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NULL,
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"spdif",
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sizeof(IEC958Context),
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CODEC_ID_AC3,
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CODEC_ID_NONE,
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spdif_write_header,
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spdif_write_packet,
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spdif_write_trailer,
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};
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