/*
- * IEC958 muxer
+ * IEC 61937 common code
* Copyright (c) 2009 Bartlomiej Wolowiec
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-/**
- * @file libavformat/spdif.c
- * 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;
- }
- put_le16(s->pb, 0);
- put_le16(s->pb, 0);
- put_le16(s->pb, 0);
- put_le16(s->pb, 0);
- 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,
-};
projects / ffmpeg / blobdiff