[alsa-devel] [PATCH] crec: Add option to specify codec ID

[Richard Fitzgerald]

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.

Signed-off-by: Richard Fitzgerald <rf at opensource.wolfsonmicro.com>
---
 src/utils/crec.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 59 insertions(+), 7 deletions(-)

diff --git a/src/utils/crec.c b/src/utils/crec.c
index 8d5b7b0..a586fc4 100644
--- a/src/utils/crec.c
+++ b/src/utils/crec.c
@@ -83,6 +83,27 @@ 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 },
+	{ "ARMWBPLUS", 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 },
+};
+#define CREC_NUM_CODEC_IDS (sizeof(codec_ids) / sizeof(codec_ids[0]))
 
 struct riff_chunk {
 	char desc[4];
@@ -153,6 +174,8 @@ static void size_wave_header(struct wave_header *header, uint32_t size)
 
 static void usage(void)
 {
+	int i;
+
 	fprintf(stderr, "usage: crec [OPTIONS] [filename]\n"
 		"-c\tcard number\n"
 		"-d\tdevice node\n"
@@ -163,14 +186,22 @@ 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"
+		"-F\tSpecify the format: S16_LE, S32_LE (default S16_LE)\n"
+		"-I\tSpecify codec ID (default PCM)\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",
+		"\tcrec -f 5 test.wav\n\n"
+		"Valid codec IDs:\n",
 		DEFAULT_CHANNELS, DEFAULT_RATE);
 
+	for (i = 0; i < CREC_NUM_CODEC_IDS; ++i)
+		fprintf(stderr, "%s%c", codec_ids[i].name,
+			(i % 8) ? ' ' : '\n');
+
+	fprintf(stderr, "\nor the value in decimal or hex\n");
+
 	exit(EXIT_FAILURE);
 }
 
@@ -239,7 +270,8 @@ 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;
@@ -288,7 +320,7 @@ 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;
@@ -408,10 +440,11 @@ 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");
@@ -422,7 +455,7 @@ 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();
@@ -462,6 +495,25 @@ 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);
 		}
@@ -477,7 +529,7 @@ int main(int argc, char **argv)
 	}
 
 	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