diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/AlsaDabplus.cpp | 115 |
1 files changed, 101 insertions, 14 deletions
diff --git a/src/AlsaDabplus.cpp b/src/AlsaDabplus.cpp index 104a8c3..f8e4f4b 100644 --- a/src/AlsaDabplus.cpp +++ b/src/AlsaDabplus.cpp @@ -27,6 +27,8 @@ #include <stdint.h> #include <time.h> #include <unistd.h> +#include <sys/types.h> +#include <sys/stat.h> #include "libAACenc/include/aacenc_lib.h" @@ -37,14 +39,38 @@ extern "C" { using namespace std; void usage(const char* name) { - fprintf(stderr, "%s [OPTION...]\n", name); + fprintf(stderr, + "%s is a HE-AACv2 encoder for DAB+ based on fdk-aac-dabplus\n" + "that can encode from a ALSA source, and encode\n" + "to a ZeroMQ output for ODR-DabMux.\n" + "\n" + "The -D option enables experimental sound card clock drift compensation.\n" + "A consumer sound card has a clock that is always a bit imprecise, and\n" + "would drift off after some time. ODR-DabMux cannot handle such drift\n" + "because it would have to throw away or insert a full DAB+ superframe,\n" + "which would create audible artifacts. This drift compensation can\n" + "make sure that the encoding rate is correct by inserting or deleting\n" + "audio samples.\n" + "\n" + "When this option is enabled, you will see U and O<number> printed in\n" + "the console. These correspond to audio underruns and overruns caused\n" + "by sound card clock drift. When sparse, they should not create audible\n" + "artifacts.\n" + "\n" + "This encoder includes PAD (DLS and MOT Slideshow) support by\n" + "http://rd.csp.it to be used with mot-encoder\n" + "\n" + " http://opendigitalradio.org\n" + "\nUsage:\n" + "%s [OPTION...]\n", name, name); fprintf(stderr, " -b, --bitrate={ 8, 16, ..., 192 } Output bitrate in kbps. Must be 8 multiple.\n" " -D, --drift-comp Enable ALSA sound card drift compensation.\n" //" -i, --input=FILENAME Input filename (default: stdin).\n" " -o, --output=URI Output zmq uri. (e.g. 'tcp://*:9000')\n" " -a, --afterburner Turn on AAC encoder quality increaser.\n" - //" -p, --pad=BYTES Set PAD size in bytes.\n" + " -p, --pad=BYTES Set PAD size in bytes.\n" + " -P, --pad-fifo=FILENAME Set PAD data input fifo name (default: /tmp/pad.fifo).\n" " -d, --device=alsa_device Set ALSA input device (default: \"default\").\n" " -c, --channels={ 1, 2 } Nb of input channels for raw input (default: 2).\n" " -r, --rate={ 32000, 48000 } Sample rate for raw input (default: 48000).\n" @@ -161,12 +187,19 @@ int main(int argc, char *argv[]) { bool drift_compensation = false; AACENC_InfoStruct info = { 0 }; + char* pad_fifo = "/tmp/pad.fifo"; + int pad_fd; + unsigned char pad_buf[128]; + int padlen; + const struct option longopts[] = { {"bitrate", required_argument, 0, 'b'}, {"output", required_argument, 0, 'o'}, {"device", required_argument, 0, 'd'}, {"rate", required_argument, 0, 'r'}, {"channels", required_argument, 0, 'c'}, + {"pad", required_argument, 0, 'p'}, + {"pad-fifo", required_argument, 0, 'P'}, {"drift-comp", no_argument, 0, 'D'}, {"afterburner", no_argument, 0, 'a'}, {"help", no_argument, 0, 'h'}, @@ -175,7 +208,7 @@ int main(int argc, char *argv[]) { int index; while(ch != -1) { - ch = getopt_long(argc, argv, "hab:c:o:r:d:D", longopts, &index); + ch = getopt_long(argc, argv, "hab:c:o:r:d:Dp:P:", longopts, &index); switch (ch) { case 'd': alsa_device = optarg; @@ -198,6 +231,12 @@ int main(int argc, char *argv[]) { case 'D': drift_compensation = true; break; + case 'p': + padlen = atoi(optarg); + break; + case 'P': + pad_fifo = optarg; + break; case '?': case 'h': usage(argv[0]); @@ -217,6 +256,26 @@ int main(int argc, char *argv[]) { return 1; } + if (padlen != 0) { + int flags; + if (mkfifo(pad_fifo, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH) != 0) { + if (errno != EEXIST) { + fprintf(stderr, "Can't create pad file: %d!\n", errno); + return 1; + } + } + pad_fd = open(pad_fifo, O_RDONLY | O_NONBLOCK); + if (pad_fd == -1) { + fprintf(stderr, "Can't open pad file!\n"); + return 1; + } + flags = fcntl(pad_fd, F_GETFL, 0); + if (fcntl(pad_fd, F_SETFL, flags | O_NONBLOCK)) { + fprintf(stderr, "Can't set non-blocking mode in pad file!\n"); + return 1; + } + } + zmq::context_t zmq_ctx; zmq::socket_t zmq_sock(zmq_ctx, ZMQ_PUB); zmq_sock.connect(outuri); @@ -288,14 +347,14 @@ int main(int argc, char *argv[]) { int calls = 0; // for checking while (1) { - int in_identifier = IN_AUDIO_DATA; + int in_identifier[] = {IN_AUDIO_DATA, IN_ANCILLRY_DATA}; int out_identifier = OUT_BITSTREAM_DATA; AACENC_BufDesc in_buf = { 0 }, out_buf = { 0 }; AACENC_InArgs in_args = { 0 }; AACENC_OutArgs out_args = { 0 }; - void *in_ptr, *out_ptr; - int in_size, in_elem_size; + void *in_ptr[2], *out_ptr; + int in_size[2], in_elem_size[2]; int out_size, out_elem_size; @@ -326,6 +385,30 @@ int main(int argc, char *argv[]) { } } + // --------------- Read data from the PAD fifo + int ret; + if (padlen != 0) { + ret = read(pad_fd, pad_buf, padlen); + } + else { + ret = 0; + } + + + if(ret < 0 && errno == EAGAIN) { + // If this condition passes, there is no data to be read + in_buf.numBufs = 1; // Samples; + } + else if(ret >= 0) { + // Otherwise, you're good to go and buffer should contain "count" bytes. + in_buf.numBufs = 2; // Samples + Data; + } + else { + // Some other error occurred during read. + fprintf(stderr, "Unable to read from PAD!\n"); + break; + } + // -------------- Read Data memset(outbuf, 0x00, outbuf_size); @@ -351,15 +434,19 @@ int main(int argc, char *argv[]) { // -------------- AAC Encoding - in_ptr = input_buf; - in_size = read; - in_elem_size = BYTES_PER_SAMPLE; + in_ptr[0] = input_buf; + in_ptr[1] = pad_buf; + in_size[0] = read; + in_size[1] = padlen; + in_elem_size[0] = BYTES_PER_SAMPLE; + in_elem_size[1] = sizeof(uint8_t); in_args.numInSamples = input_size/BYTES_PER_SAMPLE; - in_buf.numBufs = 1; - in_buf.bufs = &in_ptr; - in_buf.bufferIdentifiers = &in_identifier; - in_buf.bufSizes = &in_size; - in_buf.bufElSizes = &in_elem_size; + in_args.numAncBytes = padlen; + + in_buf.bufs = (void**)&in_ptr; + in_buf.bufferIdentifiers = in_identifier; + in_buf.bufSizes = in_size; + in_buf.bufElSizes = in_elem_size; out_ptr = outbuf; out_size = sizeof(outbuf); |