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From:   Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
To:     vkoul@kernel.org, broonie@kernel.org, tiwai@suse.com
Cc:     corbet@lwn.net, alsa-devel@alsa-project.org,
        linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
        quic_plai@quicinc.com, quic_mohs@quicinc.com,
        Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Subject: [PATCH v3] ALSA: compress: allow setting codec params after next track
Date:   Mon, 19 Jun 2023 10:28:05 +0100
Message-Id: <20230619092805.21649-1-srinivas.kandagatla@linaro.org>
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For gapless playback it is possible that each track can have different
codec profile with same decoder, for example we have WMA album,
we may have different tracks as WMA v9, WMA v10 and so on

Or if DSP's like QDSP have abililty to switch decoders on single stream
for each track, then this call could be used to set new codec parameters.

Existing code does not allow to change this profile while doing gapless
playback.

Reuse existing SNDRV_COMPRESS_SET_PARAMS to set this new track params along
some additional checks to enforce proper state machine.

With this new changes now the user can call SNDRV_COMPRESS_SET_PARAMS
anytime after setting next track and additional check in write should
also ensure that params are set before writing new data.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
---
Changes since v2:
 simplified the logic to allow set_params and udated the documentation accordingly

 Documentation/sound/designs/compress-offload.rst | 11 ++++++-----
 sound/core/compress_offload.c                    |  5 ++++-
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/Documentation/sound/designs/compress-offload.rst b/Documentation/sound/designs/compress-offload.rst
index 935f325dbc77..655624f77092 100644
--- a/Documentation/sound/designs/compress-offload.rst
+++ b/Documentation/sound/designs/compress-offload.rst
@@ -268,11 +268,12 @@ with setting of meta_data and signalling for next track ::
               |                              |
               |                              V
               |                         +----------+
-              |                         |          |
-              |                         |NEXT_TRACK|
-              |                         |          |
-              |                         +----------+
-              |                              |
+              |    compr_set_params()   |          |
+              |             +-----------|NEXT_TRACK|
+              |             |           |          |
+              |             |           +--+-------+
+              |             |              | |
+              |             +--------------+ |
               |                              |
               |                              | compr_partial_drain()
               |                              |
diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c
index 243acad89fd3..30f73097447b 100644
--- a/sound/core/compress_offload.c
+++ b/sound/core/compress_offload.c
@@ -589,7 +589,7 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
 	struct snd_compr_params *params;
 	int retval;
 
-	if (stream->runtime->state == SNDRV_PCM_STATE_OPEN) {
+	if (stream->runtime->state == SNDRV_PCM_STATE_OPEN || stream->next_track) {
 		/*
 		 * we should allow parameter change only when stream has been
 		 * opened not in other cases
@@ -612,6 +612,9 @@ snd_compr_set_params(struct snd_compr_stream *stream, unsigned long arg)
 		if (retval)
 			goto out;
 
+		if (stream->next_track)
+			goto out;
+
 		stream->metadata_set = false;
 		stream->next_track = false;
 
-- 
2.21.0