[alsa-devel] [PATCH 2/2] crecord: Add option to specify codec ID
Richard Fitzgerald
rf at opensource.wolfsonmicro.com
Wed Jan 18 17:29:54 CET 2017
This patch adds a -I command line option to set the codec ID,
either from a defined set of string values or as a number.
After discussion with Vinod it was agreed that we should only
allow writing to a file if we support creating the correct container
file format for that data. As we currently only have support for
creating WAV files only PCM data can be written to a file. Other
formats can be sent raw to stdout.
Signed-off-by: Richard Fitzgerald <rf at opensource.wolfsonmicro.com>
---
src/utils/crecord.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 87 insertions(+), 12 deletions(-)
diff --git a/src/utils/crecord.c b/src/utils/crecord.c
index 390fe45..1fd3698 100644
--- a/src/utils/crecord.c
+++ b/src/utils/crecord.c
@@ -83,6 +83,31 @@ static bool streamed;
static const unsigned int DEFAULT_CHANNELS = 1;
static const unsigned int DEFAULT_RATE = 44100;
static const unsigned int DEFAULT_FORMAT = SNDRV_PCM_FORMAT_S16_LE;
+static const unsigned int DEFAULT_CODEC_ID = SND_AUDIOCODEC_PCM;
+
+static const struct {
+ const char *name;
+ unsigned int id;
+} codec_ids[] = {
+ { "PCM", SND_AUDIOCODEC_PCM },
+ { "MP3", SND_AUDIOCODEC_MP3 },
+ { "AMR", SND_AUDIOCODEC_AMR },
+ { "AMRWB", SND_AUDIOCODEC_AMRWB },
+ { "AMRWBPLUS", SND_AUDIOCODEC_AMRWBPLUS },
+ { "AAC", SND_AUDIOCODEC_AAC },
+ { "WMA", SND_AUDIOCODEC_WMA },
+ { "REAL", SND_AUDIOCODEC_REAL },
+ { "VORBIS", SND_AUDIOCODEC_VORBIS },
+ { "FLAC", SND_AUDIOCODEC_FLAC },
+ { "IEC61937", SND_AUDIOCODEC_IEC61937 },
+ { "G723_1", SND_AUDIOCODEC_G723_1 },
+ { "G729", SND_AUDIOCODEC_G729 },
+/* BESPOKE isn't defined on older kernels */
+#ifdef SND_AUDIOCODEC_BESPOKE
+ { "BESPOKE", SND_AUDIOCODEC_BESPOKE },
+#endif
+};
+#define CREC_NUM_CODEC_IDS (sizeof(codec_ids) / sizeof(codec_ids[0]))
struct riff_chunk {
char desc[4];
@@ -151,9 +176,25 @@ static void size_wave_header(struct wave_header *header, uint32_t size)
header->data.chunk.size = size;
}
+static const char *codec_name_from_id(unsigned int id)
+{
+ static char hexname[12];
+ int i;
+
+ for (i = 0; i < CREC_NUM_CODEC_IDS; ++i) {
+ if (codec_ids[i].id == id)
+ return codec_ids[i].name;
+ }
+
+ snprintf(hexname, sizeof(hexname), "0x%x", id);
+ return hexname; /* a static is safe because we're single-threaded */
+}
+
static void usage(void)
{
- fprintf(stderr, "usage: crecord [OPTIONS] [filename]\n"
+ int i;
+
+ fprintf(stderr, "usage: crecord [OPTIONS] [filename.wav]\n"
"-c\tcard number\n"
"-d\tdevice node\n"
"-b\tbuffer size\n"
@@ -163,13 +204,23 @@ static void usage(void)
"-h\tPrints this help list\n\n"
"-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"
+ "-F\tSpecify the format: S16_LE, S32_LE (default S16_LE)\n"
+ "-I\tSpecify codec ID (default %s)\n\n"
+ "If filename.wav is not given the output is written to stdout\n"
+ "Only PCM data can be written to a WAV file.\n\n"
"Example:\n"
"\tcrecord -c 1 -d 2 test.wav\n"
- "\tcrecord -f 5 test.wav\n",
- DEFAULT_CHANNELS, DEFAULT_RATE);
+ "\tcrecord -f 5 test.wav\n"
+ "\tcrecord -I BESPOKE >raw.bin\n\n"
+ "Valid codec IDs:\n",
+ DEFAULT_CHANNELS, DEFAULT_RATE,
+ codec_name_from_id(DEFAULT_CODEC_ID));
+
+ for (i = 0; i < CREC_NUM_CODEC_IDS; ++i)
+ fprintf(stderr, "%s%c", codec_ids[i].name,
+ ((i + 1) % 8) ? ' ' : '\n');
+
+ fprintf(stderr, "\nor the value in decimal or hex\n");
exit(EXIT_FAILURE);
}
@@ -239,7 +290,8 @@ static int finish_record(void)
static void capture_samples(char *name, unsigned int card, unsigned int device,
unsigned long buffer_size, unsigned int frag,
unsigned int length, unsigned int rate,
- unsigned int channels, unsigned int format)
+ unsigned int channels, unsigned int format,
+ unsigned int codec_id)
{
struct compr_config config;
struct snd_codec codec;
@@ -289,7 +341,7 @@ static void capture_samples(char *name, unsigned int card, unsigned int device,
memset(&codec, 0, sizeof(codec));
memset(&config, 0, sizeof(config));
- codec.id = SND_AUDIOCODEC_PCM;
+ codec.id = codec_id;
codec.ch_in = channels;
codec.ch_out = channels;
codec.sample_rate = rate;
@@ -409,10 +461,11 @@ int main(int argc, char **argv)
{
char *file;
unsigned long buffer_size = 0;
- int c;
+ int c, i;
unsigned int card = 0, device = 0, frag = 0, length = 0;
unsigned int rate = DEFAULT_RATE, channels = DEFAULT_CHANNELS;
unsigned int format = DEFAULT_FORMAT;
+ unsigned int codec_id = DEFAULT_CODEC_ID;
if (signal(SIGINT, sig_handler) == SIG_ERR) {
fprintf(stderr, "Error registering signal handler\n");
@@ -423,7 +476,7 @@ int main(int argc, char **argv)
usage();
verbose = 0;
- while ((c = getopt(argc, argv, "hvl:R:C:F:b:f:c:d:")) != -1) {
+ while ((c = getopt(argc, argv, "hvl:R:C:F:I:b:f:c:d:")) != -1) {
switch (c) {
case 'h':
usage();
@@ -463,6 +516,25 @@ int main(int argc, char **argv)
usage();
}
break;
+ case 'I':
+ if (optarg[0] == '0') {
+ codec_id = strtol(optarg, NULL, 0);
+ } else {
+ for (i = 0; i < CREC_NUM_CODEC_IDS; ++i) {
+ if (strcmp(optarg,
+ codec_ids[i].name) == 0) {
+ codec_id = codec_ids[i].id;
+ break;
+ }
+ }
+
+ if (i == CREC_NUM_CODEC_IDS) {
+ fprintf(stderr, "Unrecognised ID: %s\n",
+ optarg);
+ usage();
+ }
+ }
+ break;
default:
exit(EXIT_FAILURE);
}
@@ -472,14 +544,17 @@ int main(int argc, char **argv)
file = NULL;
finfo = fopen("/dev/null", "w");
streamed = true;
- } else {
+ } else if (codec_id == SND_AUDIOCODEC_PCM) {
file = argv[optind];
finfo = stdout;
streamed = false;
+ } else {
+ fprintf(stderr, "ERROR: Only PCM can be written to a WAV file\n");
+ exit(EXIT_FAILURE);
}
capture_samples(file, card, device, buffer_size, frag, length,
- rate, channels, format);
+ rate, channels, format, codec_id);
fprintf(finfo, "Finish capturing... Close Normally\n");
--
1.9.1
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