From: Ammar Zahid Ali Syed aali@opensource.wolfsonmicro.com

It's useful for testing to be able to stream the captured audio to stdout instead of having to go via a file.

Signed-off-by: Richard Fitzgerald rf@opensource.wolfsonmicro.com Signed-off-by: Ammar Ali aali@opensource.wolfsonmicro.com --- crec.c | 73 ++++++++++++++++++++++++++++++++++++++++----------------------- 1 files changed, 46 insertions(+), 27 deletions(-)

diff --git a/crec.c b/crec.c index e3f189f..258fade 100644 --- a/crec.c +++ b/crec.c @@ -77,6 +77,8 @@

static int verbose; static int file; +static FILE *finfo; +static bool streamed;

static const unsigned int DEFAULT_CHANNELS = 1; static const unsigned int DEFAULT_RATE = 44100; @@ -151,7 +153,7 @@ static void size_wave_header(struct wave_header *header, uint32_t size)

static void usage(void) { - fprintf(stderr, "usage: crec [OPTIONS] filename\n" + fprintf(stderr, "usage: crec [OPTIONS] [filename]\n" "-c\tcard number\n" "-d\tdevice node\n" "-b\tbuffer size\n" @@ -162,6 +164,8 @@ static void usage(void) "-C\tSpecify the number of channels (default %u)\n" "-R\tSpecify the sample rate (default %u)\n" "-F\tSpecify the format: S16_LE, S32_LE (default S16_LE)\n\n" + "If filename is not given the output is\n" + "written to stdout\n\n" "Example:\n" "\tcrec -c 1 -d 2 test.wav\n" "\tcrec -f 5 test.wav\n", @@ -180,7 +184,7 @@ static int print_time(struct compress *compress) fprintf(stderr, "ERR: %s\n", compress_get_error(compress)); return -1; } else { - printf("DSP recorded %jd.%jd\n", + fprintf(finfo, "DSP recorded %jd.%jd\n", (intmax_t)tstamp.tv_sec, (intmax_t)tstamp.tv_nsec*1000); } return 0; @@ -195,6 +199,10 @@ static int finish_record() if (!file) return -ENOENT;

+ /* can't rewind if streaming to stdout */ + if (streamed) + return 0; + /* Get amount of data written to file */ ret = lseek(file, 0, SEEK_END); if (ret < 0) @@ -256,22 +264,27 @@ void capture_samples(char *name, unsigned int card, unsigned int device, length = length * rate * (samplebits / 8) * channels;

if (verbose) - printf("%s: entry, reading %u bytes\n", __func__, length); - - file = open(name, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); - if (file == -1) { - fprintf(stderr, "Unable to open file '%s'\n", name); - exit(EXIT_FAILURE); - } + fprintf(finfo, "%s: entry, reading %u bytes\n", __func__, length); + if (!name) { + file = STDOUT_FILENO; + } else { + file = open(name, O_RDWR | O_CREAT, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); + if (file == -1) { + fprintf(stderr, "Unable to open file '%s'\n", name); + exit(EXIT_FAILURE); + } + }

/* Write a header, will update with size once record is complete */ - init_wave_header(&header, channels, rate, samplebits); - written = write(file, &header, sizeof(header)); - if (written != sizeof(header)) { + if (!streamed) { + init_wave_header(&header, channels, rate, samplebits); + written = write(file, &header, sizeof(header)); + if (written != sizeof(header)) { fprintf(stderr, "Error writing output file header: %s\n", strerror(errno)); goto file_exit; - } + } + }

memset(&codec, 0, sizeof(codec)); memset(&config, 0, sizeof(config)); @@ -299,7 +312,7 @@ void capture_samples(char *name, unsigned int card, unsigned int device, };

if (verbose) - printf("%s: Opened compress device\n", __func__); + fprintf(finfo, "%s: Opened compress device\n", __func__);

size = config.fragment_size; buffer = malloc(size * config.fragments); @@ -308,15 +321,15 @@ void capture_samples(char *name, unsigned int card, unsigned int device, goto comp_exit; }

- printf("Recording file %s On Card %u device %u, with buffer of %lu bytes\n", + fprintf(finfo, "Recording file %s On Card %u device %u, with buffer of %lu bytes\n", name, card, device, buffer_size); - printf("Format %u Channels %u, %u Hz\n", - codec.id, codec.ch_out, rate); + fprintf(finfo, "Codec %u Format %u Channels %u, %u Hz\n", + codec.id, codec.format, codec.ch_out, rate);

compress_start(compress);

if (verbose) - printf("%s: Capturing audio NOW!!!\n", __func__); + fprintf(finfo, "%s: Capturing audio NOW!!!\n", __func__);

do { if (length && size > length - total_read) @@ -344,7 +357,7 @@ void capture_samples(char *name, unsigned int card, unsigned int device, } if (verbose) { print_time(compress); - printf("%s: read %d\n", __func__, read); + fprintf(finfo, "%s: read %d\n", __func__, read); } } } while (!length || total_read < length); @@ -362,7 +375,7 @@ void capture_samples(char *name, unsigned int card, unsigned int device, }

if (verbose) - printf("%s: exit success\n", __func__); + fprintf(finfo, "%s: exit success\n", __func__);

free(buffer); close(file); @@ -379,7 +392,7 @@ file_exit: close(file);

if (verbose) - printf("%s: exit failure\n", __func__); + fprintf(finfo, "%s: exit failure\n", __func__);

exit(EXIT_FAILURE); } @@ -408,7 +421,7 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); }

- if (argc < 2) + if (argc < 1) usage();

verbose = 0; @@ -456,15 +469,21 @@ int main(int argc, char **argv) exit(EXIT_FAILURE); } } - if (optind >= argc) - usage(); - - file = argv[optind]; + if (optind >= argc) { + file = NULL; + finfo = fopen("/dev/null", "w"); + streamed = true; + } else { + file = argv[optind]; + finfo = stdout; + streamed = false; + }

capture_samples(file, card, device, buffer_size, frag, length, rate, channels, format);

- printf("Finish capturing... Close Normally\n"); + fprintf(finfo, "Finish capturing... Close Normally\n"); + exit(EXIT_SUCCESS); }