diff options
| -rw-r--r-- | README.md | 17 | ||||
| -rw-r--r-- | src/mot-encoder.cpp | 73 |
2 files changed, 73 insertions, 17 deletions
@@ -16,7 +16,7 @@ The JACK input does not automatically connect to anything. The encoder runs at the rate defined by the system clock, and therefore sound card clock drift compensation is also used. -*dabplus-enc* includes support for DAB MOT Slideshow and DLS, written by +*dabplus-enc* includes support for DAB MOT Slideshow and DLS, contributed by [CSP](http://rd.csp.it). To encode DLS and Slideshow data, the *mot-encoder* tool reads images @@ -188,14 +188,15 @@ dabplus-enc returns: Usage of MOT Slideshow and DLS ============================== -MOT Slideshow is a new feature, which has been tested on several receivers and -using [XPADxpert](http://www.basicmaster.de/xpadxpert/), but is still a work -in progress. +*mot-encoder* reads images from the specified folder, and generates the PAD +data for the encoder. This is communicated through a fifo to the encoder. It +also reads DLS from a file, and includes this information in the PAD. -*mot-encoder* reads images from -the specified folder, and generates the PAD data for the encoder. This is -communicated through a fifo to the encoder. It also reads DLS from a file, and -includes this information in the PAD. +It can read all file formats supported by ImageMagick, and by default resizes +them to 320x240 pixels, and compresses them as JPEG. If the input file is already +a JPEG file of the correct size, and smaller than 50kB, it is sent without further +compression. If the input file is a PNG that satisfies the same criteria, it is +transmitted as PNG without any recompression. *dabplus-enc* can insert the PAD data from mot-encoder into the bitstream. The mp2 encoder [toolame-dab](https://github.com/Opendigitalradio/toolame-dab) diff --git a/src/mot-encoder.cpp b/src/mot-encoder.cpp index 832ad50..c92a596 100644 --- a/src/mot-encoder.cpp +++ b/src/mot-encoder.cpp @@ -197,7 +197,14 @@ unsigned char contname[14]; // 0xCC 0x0C 0x00 imgXXXX.jpg } MOTSLIDEHDR; */ int encodeFile(int output_fd, std::string& fname, int fidx, int padlen, bool raw_slides); -void createMotHeader(size_t blobsize, int fidx, unsigned char* mothdr, int* mothdrlen); + +void createMotHeader( + size_t blobsize, + int fidx, + unsigned char* mothdr, + int* mothdrlen, + bool jfif_not_png); + void createMscDG(MSCDG* msc, unsigned short int dgtype, unsigned short int cindex, unsigned short int lastseg, unsigned short int tid, unsigned char* data, unsigned short int datalen); @@ -525,6 +532,11 @@ int encodeFile(int output_fd, std::string& fname, int fidx, int padlen, bool raw */ bool orig_is_jpeg = false; + /* If the original is a PNG, we transmit it as is, if the resolution is correct + * and the file is not too large. Otherwise it gets resized and sent as JPEG. + */ + bool orig_is_png = false; + /* By default, we do resize the image to 320x240, with a quality such that * the blobsize is at most MAXSLIDESIZE. * @@ -533,6 +545,7 @@ int encodeFile(int output_fd, std::string& fname, int fidx, int padlen, bool raw */ bool resize_required = true; + bool jfif_not_png = true; if (!raw_slides) { @@ -564,6 +577,16 @@ int encodeFile(int output_fd, std::string& fname, int fidx, int padlen, bool raw fname.c_str(), fidx, width, height, orig_format, orig_quality); } } + else if (strcmp(orig_format, "PNG") == 0) { + orig_is_png = true; + jfif_not_png = false; + + if (verbose) { + fprintf(stderr, "mot-encoder image: %s (id=%d)." + " Original size: %zu x %zu. (%s)\n", + fname.c_str(), fidx, width, height, orig_format); + } + } else if (verbose) { fprintf(stderr, "mot-encoder image: %s (id=%d)." " Original size: %zu x %zu. (%s)\n", @@ -580,23 +603,28 @@ int encodeFile(int output_fd, std::string& fname, int fidx, int padlen, bool raw fname.c_str(), fidx, width, height); } - if (orig_is_jpeg && height == 240 && width == 320) { + if ((orig_is_jpeg || orig_is_png) && height == 240 && width == 320) { // Don't recompress the image and check if the blobsize is suitable blob = MagickGetImagesBlob(m_wand, &blobsize); if (blobsize < MAXSLIDESIZE) { - fprintf(stderr, "mot-encoder image: %s (id=%d). No resize needed: %zu Bytes\n", - fname.c_str(), fidx, blobsize); + if (verbose) { + fprintf(stderr, "mot-encoder image: %s (id=%d). No resize needed: %zu Bytes\n", + fname.c_str(), fidx, blobsize); + } resize_required = false; } } if (resize_required) { blobsize = resizeImage(m_wand, &blob); + + // resizeImage always creates a jpg output + jfif_not_png = true; } } - else { + else { // Use RAW data, it might not even be a jpg ! // read file FILE* pFile = fopen(fname.c_str(), "rb"); if (pFile == NULL) { @@ -625,6 +653,20 @@ int encodeFile(int output_fd, std::string& fname, int fidx, int padlen, bool raw // copy the file into the buffer: size_t dummy = fread(blob, 1, blobsize, pFile); + size_t last_dot = fname.rfind("."); + + // default: + jfif_not_png = true; // This is how we did it in the past. + // It's wrong anyway, so we're at least compatible + + if (last_dot != std::string::npos) { + std::string file_extension = fname.substr(last_dot, std::string::npos); + + if (file_extension == ".png") { + jfif_not_png = false; + } + } + if (pFile != NULL) { fclose(pFile); } @@ -637,7 +679,7 @@ int encodeFile(int output_fd, std::string& fname, int fidx, int padlen, bool raw nseg++; } - createMotHeader(blobsize, fidx, mothdr, &mothdrlen); + createMotHeader(blobsize, fidx, mothdr, &mothdrlen, jfif_not_png); // Create the MSC Data Group C-Structure createMscDG(&msc, 3, 0, 1, fidx, mothdr, mothdrlen); // Generate the MSC DG frame (Figure 9 en 300 401) @@ -675,21 +717,34 @@ encodefile_out: } -void createMotHeader(size_t blobsize, int fidx, unsigned char* mothdr, int* mothdrlen) +void createMotHeader(size_t blobsize, int fidx, unsigned char* mothdr, int* mothdrlen, bool jfif_not_png) { struct stat s; - uint8_t MotHeaderCore[7] = {0x00,0x00,0x00,0x00,0x0D,0x04,0x01}; + uint8_t MotHeaderCore[7] = {0x00,0x00,0x00,0x00,0x0D,0x04,0x00}; uint8_t MotHeaderExt[19] = {0x85,0x00,0x00,0x00,0x00,0xcc,0x0c, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; char cntemp[12]; int i; + // Set correct content subtype + // ETSI TS 101 756 V1.2.1 Clause 6.1 Table 17 + if (jfif_not_png) { + MotHeaderCore[6] = 0x01; + } + else { + MotHeaderCore[6] = 0x03; + } + MotHeaderCore[0] = (blobsize<<4 & 0xFF000000) >> 24; MotHeaderCore[1] = (blobsize<<4 & 0x00FF0000) >> 16; MotHeaderCore[2] = (blobsize<<4 & 0x0000FF00) >> 8; MotHeaderCore[3] = (blobsize<<4 & 0x000000FF); - sprintf(cntemp, "img%04d.jpg", fidx); + sprintf(cntemp, + "img%04d.%s", + fidx, + jfif_not_png ? "jpg" : "png" ); + for (i = 0; i < strlen(cntemp); i++) { MotHeaderExt[8+i] = cntemp[i]; } |