X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fspdif.c;h=604141a261c2dfeb35dffaefa003e0542a2812e6;hb=f27ac6d83c3d90cac49230480a8569a1651763bd;hp=1c53f736c76775d874f96cc91704d705d8d6c4b7;hpb=ba87f0801d77c21eb1e4891ca1f846500bbb0939;p=ffmpeg diff --git a/libavformat/spdif.c b/libavformat/spdif.c index 1c53f736c76..604141a261c 100644 --- a/libavformat/spdif.c +++ b/libavformat/spdif.c @@ -1,5 +1,5 @@ /* - * IEC958 muxer + * IEC 61937 common code * Copyright (c) 2009 Bartlomiej Wolowiec * * This file is part of FFmpeg. @@ -19,288 +19,24 @@ * 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; +#include "spdif.h" +#include "libavutil/bswap.h" //TODO move to DSP -static void bswap_buf16(uint16_t *dst, const uint16_t *src, int w) +void ff_spdif_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]); + dst[i + 0] = av_bswap16(src[i + 0]); + dst[i + 1] = av_bswap16(src[i + 1]); + dst[i + 2] = av_bswap16(src[i + 2]); + dst[i + 3] = av_bswap16(src[i + 3]); + dst[i + 4] = av_bswap16(src[i + 4]); + dst[i + 5] = av_bswap16(src[i + 5]); + dst[i + 6] = av_bswap16(src[i + 6]); + dst[i + 7] = av_bswap16(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; + dst[i + 0] = av_bswap16(src[i + 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, -};