[alsa-devel] [RFCv3][PATCH 21/39] axfer: add an option to finish transmission at XRUN

[Takashi Sakamoto]

In aplay, '--fatal-errors' option has an effect to give up recovery of PCM
substream from XRUN state. This commit adds support for this option.

In original implementation, this option brings program abort. This seems
to generate core dump of process VMA. However, typically, XRUN comes from
timing mismatch between hardware and application, therefore core dump has
less helpful. This commit finishes this program in usual way with this
option at XRUN.

Signed-off-by: Takashi Sakamoto <o-takashi at sakamocchi.jp>
---
 axfer/options.c        | 4 ++++
 axfer/options.h        | 1 +
 axfer/xfer-libasound.c | 4 ++--
 axfer/xfer-libasound.h | 1 +
 4 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/axfer/options.c b/axfer/options.c
index f3d2dfcf..91708bb4 100644
--- a/axfer/options.c
+++ b/axfer/options.c
@@ -15,6 +15,7 @@
 enum no_short_opts {
 	/* 128 belongs to non us-ascii character set. */
 	OPT_DUMP_HW_PARAMS = 128,
+	OPT_FATAL_ERRORS,
 	/* Obsoleted. */
 	OPT_MAX_FILE_TIME,
 };
@@ -307,6 +308,7 @@ int context_options_init(struct context_options *opts, int argc,
 		{"rate",		1, 0, 'r'},
 		/* For debugging. */
 		{"dump-hw-params",	0, 0, OPT_DUMP_HW_PARAMS},
+		{"fatal-errors",	0, 0, OPT_FATAL_ERRORS},
 		/* Obsoleted. */
 		{"max-file-time",       1, 0, OPT_MAX_FILE_TIME},
 		{NULL,			0, 0, 0},
@@ -348,6 +350,8 @@ int context_options_init(struct context_options *opts, int argc,
 			opts->frames_per_second = parse_l(optarg, &err);
 		else if (c == OPT_DUMP_HW_PARAMS)
 			opts->dump_hw_params = true;
+		else if (c == OPT_FATAL_ERRORS)
+			opts->finish_at_xrun = true;
 		else if (c == OPT_MAX_FILE_TIME) {
 			fprintf(stderr,
 				"An option '--%s' is obsoleted and has no "
diff --git a/axfer/options.h b/axfer/options.h
index ddbdbfa9..de9ac998 100644
--- a/axfer/options.h
+++ b/axfer/options.h
@@ -36,6 +36,7 @@ struct context_options {
 
 	/* For debugging. */
 	bool dump_hw_params;
+	bool finish_at_xrun;
 };
 
 int context_options_init(struct context_options *opts, int argc,
diff --git a/axfer/xfer-libasound.c b/axfer/xfer-libasound.c
index f75dc176..7ffbc287 100644
--- a/axfer/xfer-libasound.c
+++ b/axfer/xfer-libasound.c
@@ -41,6 +41,7 @@ static int xfer_libasound_init(struct xfer_context *xfer,
 		return err;
 
 	state->verbose = xfer->verbose > 1;
+	state->finish_at_xrun = opts->finish_at_xrun;
 
 	if (opts->node == NULL)
 		node = "default";
@@ -272,13 +273,12 @@ static int xfer_libasound_process_frames(struct xfer_context *xfer,
 
 	err = state->ops->process_frames(state, frame_count, mapper, cntrs);
 	if (err < 0) {
-		if (err == -EPIPE) {
+		if (err == -EPIPE && !state->finish_at_xrun) {
 			/*
 			 * Recover the stream and continue processing
 			 * immediately. In this program -EPIPE comes from
 			 * libasound implementation instead of file I/O.
 			 */
-
 			err = snd_pcm_prepare(state->handle);
 		}
 
diff --git a/axfer/xfer-libasound.h b/axfer/xfer-libasound.h
index 97b26634..25768c41 100644
--- a/axfer/xfer-libasound.h
+++ b/axfer/xfer-libasound.h
@@ -30,6 +30,7 @@ struct libasound_state {
 	void *private_data;
 
 	bool verbose;
+	bool finish_at_xrun;
 };
 
 struct xfer_libasound_ops {
-- 
2.11.0