Add dls-only encoder for testing purposes

1 files changed, 447 insertions, 0 deletions

diff --git a/src/dls.c b/src/dls.c
new file mode 100644
index 0000000..1a9cc7c
--- /dev/null
+++ b/src/dls.c
@@ -0,0 +1,447 @@
+/*
+    Copyright (C) 2014 CSP Innovazione nelle ICT s.c.a r.l. (http://rd.csp.it/)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    dls.c
+          Generete PAD data for DLS
+
+    Authors:
+         Matthias P. Braendli
+            http://opendigitalradio.org
+
+         Sergio Sagliocco <sergio.sagliocco@csp.it>
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <getopt.h>
+
+#include "lib_crc.h"
+
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+
+#define MAXSEGLEN 8179
+#define MAXDLS 129
+
+typedef unsigned char UCHAR;
+typedef unsigned short int USHORT;
+
+void create_dls_datagroup (char* text, int padlen, unsigned char*** p_dlsdg, int* p_numdg);
+void writeDLS(int output_fd, const char* dls_file, int padlen);
+
+int get_xpadlengthmask(int padlen);
+#define ALLOWED_PADLEN "23, 26, 34, 42, 58"
+
+void usage(char* name)
+{
+    fprintf(stderr, "DAB DLS encoder %s\n\n"
+                    "By CSP Innovazione nelle ICT s.c.a r.l. (http://rd.csp.it/)\n"
+                    "and Opendigitalradio.org\n\n"
+                    "Reads DLS from /tmp/dls.file\n\n"
+                    "WARNING: This program has memory leaks! Do not attempt\n"
+                    "to leave it running for long periods of time!\n\n"
+                    "  http://opendigitalradio.org\n\n",
+#if defined(GITVERSION)
+                    GITVERSION
+#else
+                    PACKAGE_VERSION
+#endif
+                    );
+    fprintf(stderr, "Usage: %s [OPTIONS...]\n", name);
+    fprintf(stderr,
+                    " -o, --output=FILENAME  Fifo to write PAD data into.\n"
+                    "                        Default: /tmp/pad.fifo\n"
+                    " -t, --dls=FILENAME     Fifo or file to read DLS text from.\n"
+                    "                        Default: /tmp/dls.txt\n"
+                    " -p, --pad=LENGTH       Set the pad length.\n"
+                    "                        Possible values: " ALLOWED_PADLEN "\n"
+                    "                        Default: 58\n"
+           );
+}
+
+#define no_argument 0
+#define required_argument 1
+#define optional_argument 2
+int main(int argc, char *argv[])
+{
+    int len, ret;
+    int padlen=58;
+
+    char* output = "/tmp/pad.fifo";
+    char* dls_file = "/tmp/dls.txt";
+
+    const struct option longopts[] = {
+        {"output",     required_argument,  0, 'o'},
+        {"dls",        required_argument,  0, 't'},
+        {"pad",        required_argument,  0, 'p'},
+        {"help",       no_argument,        0, 'h'},
+        {0,0,0,0},
+    };
+
+    if (argc < 2) {
+        fprintf(stderr, "Error: too few arguments!\n");
+        usage(argv[0]);
+        return 2;
+    }
+
+    int ch=0;
+    int index;
+    while(ch != -1) {
+        ch = getopt_long(argc, argv, "ho:t:p:", longopts, &index);
+        switch (ch) {
+            case 'o':
+                output = optarg;
+                break;
+            case 't':
+                dls_file = optarg;
+                break;
+            case 'p':
+                padlen = atoi(optarg);
+                break;
+            case '?':
+            case 'h':
+                usage(argv[0]);
+                return 0;
+        }
+    }
+
+    if (get_xpadlengthmask(padlen) == -1) {
+        fprintf(stderr, "Error: pad length %d invalid: Possible values: "
+                    ALLOWED_PADLEN "\n",
+                padlen);
+        return 2;
+    }
+
+    int output_fd = open(output, O_WRONLY);
+    if (output_fd == -1) {
+        perror("Failed to open output");
+        return 3;
+    }
+
+    writeDLS(output_fd, dls_file, padlen);
+
+    return 0;
+}
+
+
+void writeDLS(int output_fd, const char* dls_file, int padlen) {
+    char dlstext[MAXDLS];
+    static char dlstextprev[MAXDLS];
+    int dlslen;
+    int i;
+    static unsigned char** dlsdg;
+    static int numdg = 0;
+
+    static int dlsfd = 0;
+
+    if (dlsfd!=0) {
+        close(dlsfd);
+    }
+
+    dlsfd = open(dls_file, O_RDONLY);
+    if (dlsfd == -1) {
+        fprintf(stderr,"Error - Cannot open dls file\n");
+        return;
+    }
+
+    dlslen = read(dlsfd, dlstext, MAXDLS);
+    dlstext[dlslen] = 0x00;
+    //if (strcmp(dlstext,dlstextprev)!=0) {
+    create_dls_datagroup(dlstext, padlen, &dlsdg, &numdg);
+    strcpy(dlstextprev, dlstext);
+    //}
+    for (i = 0; i < numdg; i++) {
+        write(output_fd, dlsdg[i], padlen);
+    }
+
+}
+
+void create_dls_datagroup (char* text, int padlen, UCHAR*** p_dlsdg, int* p_numdg) {
+
+    UCHAR dlsseg[8][16];      // max 8 segments, each max 16 chars
+    UCHAR** dlsdg;            // Array of datagroups composing dls text;
+
+
+    int numseg;               // Number of DSL segments
+    int lastseglen;           // Length of the last segment
+    int numdg;                // Number of data group
+    int xpadlengthmask;
+    int i, j, k, z, idx_start_crc, idx_stop_crc;
+    USHORT dlscrc;
+    static UCHAR toggle = 0;
+
+    if (toggle == 0)
+        toggle = 1;
+    else
+        toggle = 0;
+
+    numseg = strlen(text) / 16;
+    lastseglen = strlen(text) % 16;
+    if (padlen-9 >= 16) {
+        if (lastseglen > 0) {
+            numseg++;   // The last incomplete segment
+        }
+
+        // The PAD can contain the full segmnet and overhead (9 bytes)
+        numdg = numseg;
+
+    }
+    else {
+        // Each 16 char segment span over 2 dg
+        numdg = numseg * 2;
+
+        if (lastseglen > 0) {
+            numseg++;              // The last incomplete segment
+
+            if (lastseglen <= padlen-9) {
+                numdg += 1;
+            }
+            else {
+                numdg += 2;
+            }
+        }
+    }
+
+    *p_numdg = numdg;
+    fprintf(stderr, "PAD Length: %d\n", padlen);
+    fprintf(stderr, "DLS text: %s\n", text);
+    fprintf(stderr, "Number of DLS segments: %d\n", numseg);
+    fprintf(stderr, "Number of DLS data groups: %d\n", numdg);
+
+    xpadlengthmask = get_xpadlengthmask(padlen);
+
+    *p_dlsdg = (UCHAR**) malloc(numdg * sizeof(UCHAR*));
+    dlsdg = *p_dlsdg;
+
+    i = 0;
+    for (z=0; z < numseg; z++) {
+        char* curseg;
+        int curseglen;
+        UCHAR firstseg, lastseg;
+
+        curseg = &text[z * 16];
+        fprintf(stderr, "Segment number %d\n", z+1);
+
+        if (z == 0) {             // First segment
+            firstseg = 1;
+        }
+        else {
+            firstseg = 0;
+        }
+
+        if (z == numseg-1) {      //Last segment
+            if (lastseglen != 0) {
+                curseglen = lastseglen;
+            }
+            else {
+                curseglen = 16;
+            }
+            lastseg = 1;
+        }
+        else {
+            curseglen = 16;
+            lastseg = 0;
+        }
+
+        if (curseglen <= padlen-9) {  // Segment is composed of 1 data group
+            dlsdg[i] = (UCHAR*) malloc(padlen * sizeof(UCHAR));
+
+            // FF-PAD Byte L (CI=1)
+            dlsdg[i][padlen-1]=0x02;
+
+            // FF-PAD Byte L-1 (Variable size X_PAD)
+            dlsdg[i][padlen-2]=0x20;
+
+            // CI => data length = 12 (011) - Application Type=2
+            // (DLS - start of X-PAD data group)
+            dlsdg[i][padlen-3]=(xpadlengthmask<<5) | 0x02;
+
+            // End of CI list
+            dlsdg[i][padlen-4]=0x00;
+
+            // DLS Prefix (T=1,Only one segment,segment length-1)
+            dlsdg[i][padlen-5]=((toggle*8+firstseg*4+lastseg*2+0)<<4) | (curseglen-1);
+
+            if (firstseg==1) {
+                // DLS Prefix (Charset standard)
+                dlsdg[i][padlen-6]=0x00;
+            }
+            else {
+                // DLS SegNum
+                dlsdg[i][padlen-6]=z<<4;
+            }
+
+            // CRC start from prefix
+            idx_start_crc = padlen-5;
+
+            // DLS text
+            for (j = 0; j < curseglen; j++) {
+                dlsdg[i][padlen-7-j] = curseg[j];
+            }
+
+            idx_stop_crc = padlen - 7 - curseglen+1;
+
+            dlscrc = 0xffff;
+            for (j = idx_start_crc; j >= idx_stop_crc; j--) {
+                dlscrc = update_crc_ccitt(dlscrc, dlsdg[i][j]);
+            }
+
+            dlscrc = ~dlscrc;
+            fprintf(stderr, "crc=%x ~crc=%x\n", ~dlscrc, dlscrc);
+
+            dlsdg[i][padlen-7-curseglen] = (dlscrc & 0xFF00) >> 8;     // HI CRC
+            dlsdg[i][padlen-7-curseglen-1] = dlscrc & 0x00FF;          // LO CRC
+
+            // NULL PADDING
+            for (j = padlen-7-curseglen-2; j >= 0; j--) {
+                dlsdg[i][j]=0x00;
+            }
+
+            fprintf(stderr, "Data group: ");
+            for (j = 0; j < padlen; j++)
+                fprintf(stderr, "%x ", dlsdg[i][j]);
+            fprintf(stderr, "\n");
+            i++;
+
+        }
+        else {   // Segment is composed of 2 data groups
+
+            // FIRST DG (NO CRC)
+            dlscrc = 0xffff;
+
+            dlsdg[i] = (UCHAR*) malloc(padlen * sizeof(UCHAR));
+
+            // FF-PAD Byte L (CI=1)
+            dlsdg[i][padlen-1]=0x02;
+
+            // FF-PAD Byte L-1 (Variable size X_PAD)
+            dlsdg[i][padlen-2]=0x20;
+
+            // CI => data length = 12 (011) - Application Type=2
+            // (DLS - start of X-PAD data group)
+            dlsdg[i][padlen-3]=(xpadlengthmask<<5) | 0x02;
+
+            // End of CI list
+            dlsdg[i][padlen-4]=0x00;
+
+            // DLS Prefix (T=1,Only one segment,segment length-1)
+            dlsdg[i][padlen-5]=((toggle*8+firstseg*4+lastseg*2+0)<<4) | (curseglen-1);
+
+
+            if (firstseg == 1) {
+                // DLS Prefix (Charset standard)
+                dlsdg[i][padlen-6] = 0x00;
+            }
+            else {
+                // DLS SegNum
+                dlsdg[i][padlen-6]=(i-1)<<4;
+            }
+
+            dlscrc = update_crc_ccitt(dlscrc, dlsdg[i][padlen-5]);
+            dlscrc = update_crc_ccitt(dlscrc, dlsdg[i][padlen-6]);
+
+            // DLS text
+            for (j=0; j < MIN(curseglen, padlen-7); j++) {
+                dlsdg[i][padlen-7-j] = curseg[j];
+                dlscrc = update_crc_ccitt(dlscrc, dlsdg[i][padlen-7-j]);
+            }
+            k = j;
+
+            // end of segment
+            if (curseglen == padlen-8) {
+                dlscrc = ~dlscrc;
+                dlsdg[i][1] = (dlscrc & 0xFF00) >> 8;     // HI CRC
+                fprintf(stderr, "crc=%x ~crc=%x\n", ~dlscrc, dlscrc);
+            }
+            else if (curseglen == padlen-7) {
+                dlscrc = ~dlscrc;
+                fprintf(stderr, "crc=%x ~crc=%x\n", ~dlscrc, dlscrc);
+            }
+            dlsdg[i][0]=0x00;
+
+            fprintf(stderr, "First Data group: ");
+            for (j = 0; j < padlen; j++)
+                fprintf(stderr, "%x ", dlsdg[i][j]);
+            fprintf(stderr,"\n");
+
+            // SECOND DG (NO CI, NO PREFIX)
+            i++;
+
+            dlsdg[i] = (UCHAR*) malloc(padlen*sizeof(UCHAR));
+
+            // FF-PAD Byte L (CI=0)
+            dlsdg[i][padlen-1] = 0x00;
+
+            // FF-PAD Byte L-1 (Variable size X_PAD)
+            dlsdg[i][padlen-2] = 0x20;
+
+            if (curseglen == padlen-8) {
+                dlsdg[i][padlen-3] = dlscrc & 0x00FF;          // LO CRC
+            }
+            else if (curseglen==padlen-7) {
+                dlsdg[i][padlen-3] = (dlscrc & 0xFF00) >> 8;    // HI CRC
+                dlsdg[i][padlen-4] =  dlscrc & 0x00FF;          // LO CRC
+            }
+            else {
+                // DLS text
+                for (j = 0; j < curseglen-k; j++) {
+                    dlsdg[i][padlen-3-j] = curseg[k+j];
+                    dlscrc = update_crc_ccitt(dlscrc, dlsdg[i][padlen-3-j]);
+                }
+                dlscrc = ~dlscrc;
+                dlsdg[i][padlen-3-curseglen+k] =  (dlscrc & 0xFF00) >> 8;    // HI CRC
+                dlsdg[i][padlen-3-curseglen+k-1] = dlscrc & 0x00FF;          // LO CRC
+            }
+
+            fprintf(stderr, "Second Data group: ");
+            for (j = 0; j < padlen; j++)
+                fprintf(stderr, "%x ", dlsdg[i][j]);
+
+            fprintf(stderr, "\n");
+            fprintf(stderr, "**** crc=%x ~crc=%x\n", ~dlscrc, dlscrc);
+            i++;
+        }
+    }
+}
+
+int get_xpadlengthmask(int padlen)
+{
+    int xpadlengthmask;
+
+    /* Don't forget to change ALLOWED_PADLEN
+     * if you change this check
+     */
+    if (padlen == 23)
+        xpadlengthmask = 3;
+    else if (padlen == 26)
+        xpadlengthmask = 4;
+    else if (padlen == 34)
+        xpadlengthmask = 5;
+    else if (padlen == 42)
+        xpadlengthmask = 6;
+    else if (padlen == 58)
+        xpadlengthmask = 7;
+    else
+        xpadlengthmask = -1; // Error
+
+    return xpadlengthmask;
+}
+