| /* |
| * IEC958 muxer |
| * Copyright (c) 2009 Bartlomiej Wolowiec |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| /** |
| * @file |
| * IEC-61937 encapsulation of various formats, used by S/PDIF |
| * @author Bartlomiej Wolowiec |
| */ |
| |
| /* |
| * Terminology used in specification: |
| * data-burst - IEC958 frame, contains header and encapsuled frame |
| * burst-preambule - IEC958 frame header, contains 16-bits words named Pa, Pb, Pc and Pd |
| * burst-payload - encapsuled frame |
| * Pa, Pb - syncword - 0xF872, 0x4E1F |
| * Pc - burst-info, contains data-type (bits 0-6), error flag (bit 7), data-type-dependent info (bits 8-12) |
| * and bitstream number (bits 13-15) |
| * data-type - determines type of encapsuled frames |
| * Pd - length code (number of bits or bytes of encapsuled frame - according to data_type) |
| * |
| * IEC958 frames at normal usage start every specific count of bytes, |
| * dependent from data-type (spaces between packets are filled by zeros) |
| */ |
| |
| #include "avformat.h" |
| #include "libavcodec/ac3.h" |
| #include "libavcodec/dca.h" |
| #include "libavcodec/aac_parser.h" |
| |
| #define SYNCWORD1 0xF872 |
| #define SYNCWORD2 0x4E1F |
| #define BURST_HEADER_SIZE 0x8 |
| |
| enum IEC958DataType { |
| IEC958_AC3 = 0x01, ///< AC-3 data |
| IEC958_MPEG1_LAYER1 = 0x04, ///< MPEG-1 layer 1 |
| IEC958_MPEG1_LAYER23 = 0x05, ///< MPEG-1 layer 2 or 3 data or MPEG-2 without extension |
| IEC958_MPEG2_EXT = 0x06, ///< MPEG-2 data with extension |
| IEC958_MPEG2_AAC = 0x07, ///< MPEG-2 AAC ADTS |
| IEC958_MPEG2_LAYER1_LSF = 0x08, ///< MPEG-2, layer-1 low sampling frequency |
| IEC958_MPEG2_LAYER2_LSF = 0x09, ///< MPEG-2, layer-2 low sampling frequency |
| IEC958_MPEG2_LAYER3_LSF = 0x0A, ///< MPEG-2, layer-3 low sampling frequency |
| IEC958_DTS1 = 0x0B, ///< DTS type I (512 samples) |
| IEC958_DTS2 = 0x0C, ///< DTS type II (1024 samples) |
| IEC958_DTS3 = 0x0D, ///< DTS type III (2048 samples) |
| IEC958_MPEG2_AAC_LSF_2048 = 0x13, ///< MPEG-2 AAC ADTS half-rate low sampling frequency |
| IEC958_MPEG2_AAC_LSF_4096 = 0x13 | 0x20, ///< MPEG-2 AAC ADTS quarter-rate low sampling frequency |
| }; |
| |
| typedef struct IEC958Context { |
| enum IEC958DataType data_type; ///< burst info - reference to type of payload of the data-burst |
| int pkt_size; ///< length code in bits |
| int pkt_offset; ///< data burst repetition period in bytes |
| uint8_t *buffer; ///< allocated buffer, used for swap bytes |
| int buffer_size; ///< size of allocated buffer |
| |
| /// function, which generates codec dependent header information. |
| /// Sets data_type and data_offset |
| int (*header_info) (AVFormatContext *s, AVPacket *pkt); |
| } IEC958Context; |
| |
| //TODO move to DSP |
| static void bswap_buf16(uint16_t *dst, const uint16_t *src, int w) |
| { |
| int i; |
| |
| for (i = 0; i + 8 <= w; i += 8) { |
| dst[i + 0] = bswap_16(src[i + 0]); |
| dst[i + 1] = bswap_16(src[i + 1]); |
| dst[i + 2] = bswap_16(src[i + 2]); |
| dst[i + 3] = bswap_16(src[i + 3]); |
| dst[i + 4] = bswap_16(src[i + 4]); |
| dst[i + 5] = bswap_16(src[i + 5]); |
| dst[i + 6] = bswap_16(src[i + 6]); |
| dst[i + 7] = bswap_16(src[i + 7]); |
| } |
| for (; i < w; i++) |
| dst[i + 0] = bswap_16(src[i + 0]); |
| } |
| |
| static int spdif_header_ac3(AVFormatContext *s, AVPacket *pkt) |
| { |
| IEC958Context *ctx = s->priv_data; |
| int bitstream_mode = pkt->data[6] & 0x7; |
| |
| ctx->data_type = IEC958_AC3 | (bitstream_mode << 8); |
| ctx->pkt_offset = AC3_FRAME_SIZE << 2; |
| return 0; |
| } |
| |
| static int spdif_header_dts(AVFormatContext *s, AVPacket *pkt) |
| { |
| IEC958Context *ctx = s->priv_data; |
| uint32_t syncword_dts = AV_RB32(pkt->data); |
| int blocks; |
| |
| switch (syncword_dts) { |
| case DCA_MARKER_RAW_BE: |
| blocks = (AV_RB16(pkt->data + 4) >> 2) & 0x7f; |
| break; |
| case DCA_MARKER_RAW_LE: |
| blocks = (AV_RL16(pkt->data + 4) >> 2) & 0x7f; |
| break; |
| case DCA_MARKER_14B_BE: |
| blocks = |
| (((pkt->data[5] & 0x07) << 4) | ((pkt->data[6] & 0x3f) >> 2)); |
| break; |
| case DCA_MARKER_14B_LE: |
| blocks = |
| (((pkt->data[4] & 0x07) << 4) | ((pkt->data[7] & 0x3f) >> 2)); |
| break; |
| default: |
| av_log(s, AV_LOG_ERROR, "bad DTS syncword 0x%x\n", syncword_dts); |
| return -1; |
| } |
| blocks++; |
| switch (blocks) { |
| case 512 >> 5: ctx->data_type = IEC958_DTS1; break; |
| case 1024 >> 5: ctx->data_type = IEC958_DTS2; break; |
| case 2048 >> 5: ctx->data_type = IEC958_DTS3; break; |
| default: |
| av_log(s, AV_LOG_ERROR, "%i samples in DTS frame not supported\n", |
| blocks << 5); |
| return -1; |
| } |
| ctx->pkt_offset = blocks << 7; |
| |
| return 0; |
| } |
| |
| static const enum IEC958DataType mpeg_data_type[2][3] = { |
| // LAYER1 LAYER2 LAYER3 |
| { IEC958_MPEG2_LAYER1_LSF, IEC958_MPEG2_LAYER2_LSF, IEC958_MPEG2_LAYER3_LSF }, //MPEG2 LSF |
| { IEC958_MPEG1_LAYER1, IEC958_MPEG1_LAYER23, IEC958_MPEG1_LAYER23 }, //MPEG1 |
| }; |
| |
| static const uint16_t mpeg_pkt_offset[2][3] = { |
| //LAYER1 LAYER2 LAYER3 |
| { 3072, 9216, 4608 }, // MPEG2 LSF |
| { 1536, 4608, 4608 }, // MPEG1 |
| }; |
| |
| static int spdif_header_mpeg(AVFormatContext *s, AVPacket *pkt) |
| { |
| IEC958Context *ctx = s->priv_data; |
| int version = (pkt->data[1] >> 3) & 3; |
| int layer = 3 - ((pkt->data[1] >> 1) & 3); |
| int extension = pkt->data[2] & 1; |
| |
| if (layer == 3 || version == 1) { |
| av_log(s, AV_LOG_ERROR, "Wrong MPEG file format\n"); |
| return -1; |
| } |
| av_log(s, AV_LOG_DEBUG, "version: %i layer: %i extension: %i\n", version, layer, extension); |
| if (version == 2 && extension) { |
| ctx->data_type = IEC958_MPEG2_EXT; |
| ctx->pkt_offset = 4608; |
| } else { |
| ctx->data_type = mpeg_data_type [version & 1][layer]; |
| ctx->pkt_offset = mpeg_pkt_offset[version & 1][layer]; |
| } |
| // TODO Data type dependant info (normal/karaoke, dynamic range control) |
| return 0; |
| } |
| |
| static int spdif_header_aac(AVFormatContext *s, AVPacket *pkt) |
| { |
| IEC958Context *ctx = s->priv_data; |
| AACADTSHeaderInfo hdr; |
| GetBitContext gbc; |
| int ret; |
| |
| init_get_bits(&gbc, pkt->data, AAC_ADTS_HEADER_SIZE * 8); |
| ret = ff_aac_parse_header(&gbc, &hdr); |
| if (ret < 0) { |
| av_log(s, AV_LOG_ERROR, "Wrong AAC file format\n"); |
| return -1; |
| } |
| |
| ctx->pkt_offset = hdr.samples << 2; |
| switch (hdr.num_aac_frames) { |
| case 1: |
| ctx->data_type = IEC958_MPEG2_AAC; |
| break; |
| case 2: |
| ctx->data_type = IEC958_MPEG2_AAC_LSF_2048; |
| break; |
| case 4: |
| ctx->data_type = IEC958_MPEG2_AAC_LSF_4096; |
| break; |
| default: |
| av_log(s, AV_LOG_ERROR, "%i samples in AAC frame not supported\n", |
| hdr.samples); |
| return -1; |
| } |
| //TODO Data type dependent info (LC profile/SBR) |
| return 0; |
| } |
| |
| static int spdif_write_header(AVFormatContext *s) |
| { |
| IEC958Context *ctx = s->priv_data; |
| |
| switch (s->streams[0]->codec->codec_id) { |
| case CODEC_ID_AC3: |
| ctx->header_info = spdif_header_ac3; |
| break; |
| case CODEC_ID_MP1: |
| case CODEC_ID_MP2: |
| case CODEC_ID_MP3: |
| ctx->header_info = spdif_header_mpeg; |
| break; |
| case CODEC_ID_DTS: |
| ctx->header_info = spdif_header_dts; |
| break; |
| case CODEC_ID_AAC: |
| ctx->header_info = spdif_header_aac; |
| break; |
| default: |
| av_log(s, AV_LOG_ERROR, "codec not supported\n"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| static int spdif_write_trailer(AVFormatContext *s) |
| { |
| IEC958Context *ctx = s->priv_data; |
| av_freep(&ctx->buffer); |
| return 0; |
| } |
| |
| static int spdif_write_packet(struct AVFormatContext *s, AVPacket *pkt) |
| { |
| IEC958Context *ctx = s->priv_data; |
| int ret, padding; |
| |
| ctx->pkt_size = FFALIGN(pkt->size, 2) << 3; |
| ret = ctx->header_info(s, pkt); |
| if (ret < 0) |
| return -1; |
| |
| padding = (ctx->pkt_offset - BURST_HEADER_SIZE - pkt->size) >> 1; |
| if (padding < 0) { |
| av_log(s, AV_LOG_ERROR, "bitrate is too high\n"); |
| return -1; |
| } |
| |
| put_le16(s->pb, SYNCWORD1); //Pa |
| put_le16(s->pb, SYNCWORD2); //Pb |
| put_le16(s->pb, ctx->data_type); //Pc |
| put_le16(s->pb, ctx->pkt_size); //Pd |
| |
| #if HAVE_BIGENDIAN |
| put_buffer(s->pb, pkt->data, pkt->size & ~1); |
| #else |
| av_fast_malloc(&ctx->buffer, &ctx->buffer_size, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE); |
| if (!ctx->buffer) |
| return AVERROR(ENOMEM); |
| bswap_buf16((uint16_t *)ctx->buffer, (uint16_t *)pkt->data, pkt->size >> 1); |
| put_buffer(s->pb, ctx->buffer, pkt->size & ~1); |
| #endif |
| |
| if (pkt->size & 1) |
| put_be16(s->pb, pkt->data[pkt->size - 1]); |
| |
| for (; padding > 0; padding--) |
| put_be16(s->pb, 0); |
| |
| av_log(s, AV_LOG_DEBUG, "type=%x len=%i pkt_offset=%i\n", |
| ctx->data_type, pkt->size, ctx->pkt_offset); |
| |
| put_flush_packet(s->pb); |
| return 0; |
| } |
| |
| AVOutputFormat spdif_muxer = { |
| "spdif", |
| NULL_IF_CONFIG_SMALL("IEC958 - S/PDIF (IEC-61937)"), |
| NULL, |
| "spdif", |
| sizeof(IEC958Context), |
| CODEC_ID_AC3, |
| CODEC_ID_NONE, |
| spdif_write_header, |
| spdif_write_packet, |
| spdif_write_trailer, |
| }; |