Rename spdif.c as spdifenc,c to prepare for future spdif demuxer.

Patch by Anssi Hannula, anssi d hannula a iki d fi

Originally committed as revision 25713 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 313 insertions, 0 deletions

diff --git a/libavformat/spdifenc.c b/libavformat/spdifenc.c
new file mode 100644
index 0000000000..ac84c50e07
--- /dev/null
+++ b/libavformat/spdifenc.c
@@ -0,0 +1,313 @@
+/*
+ * 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/aacadtsdec.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_ATRAC              = 0x0E,          ///< Atrac data
+    IEC958_ATRAC3             = 0x0F,          ///< Atrac 3 data
+    IEC958_ATRACX             = 0x10,          ///< Atrac 3 plus data
+    IEC958_DTSHD              = 0x11,          ///< DTS HD data
+    IEC958_WMAPRO             = 0x12,          ///< WMA 9 Professional data
+    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
+    IEC958_EAC3               = 0x15,          ///< E-AC-3 data
+    IEC958_TRUEHD             = 0x16,          ///< TrueHD data
+};
+
+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] = 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] = av_bswap16(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,
+};