[pulseaudio-discuss] [PATCH v1 4/4] bluetooth: Consider different input and output MTU
Mikel Astiz
mikel.astiz.oss at gmail.com
Thu Jul 26 05:32:48 PDT 2012
From: Mikel Astiz <mikel.astiz at bmw-carit.de>
Previous implementation assumes these values are equal, but this doesn't
necessarily have to be so.
---
src/modules/bluetooth/module-bluetooth-device.c | 67 ++++++++++++++---------
1 files changed, 42 insertions(+), 25 deletions(-)
diff --git a/src/modules/bluetooth/module-bluetooth-device.c b/src/modules/bluetooth/module-bluetooth-device.c
index 95cde7b..ff1e51b 100644
--- a/src/modules/bluetooth/module-bluetooth-device.c
+++ b/src/modules/bluetooth/module-bluetooth-device.c
@@ -171,8 +171,11 @@ struct userdata {
int stream_fd;
- size_t link_mtu;
- size_t block_size;
+ size_t read_link_mtu;
+ size_t read_block_size;
+
+ size_t write_link_mtu;
+ size_t write_block_size;
struct a2dp_info a2dp;
struct hsp_info hsp;
@@ -226,13 +229,17 @@ static void a2dp_set_bitpool(struct userdata *u, uint8_t bitpool)
pa_log_debug("Bitpool has changed to %u", a2dp->sbc.bitpool);
- u->block_size =
- (u->link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
+ u->read_block_size =
+ (u->read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
+ / a2dp->frame_length * a2dp->codesize;
+
+ u->write_block_size =
+ (u->write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
/ a2dp->frame_length * a2dp->codesize;
- pa_sink_set_max_request_within_thread(u->sink, u->block_size);
+ pa_sink_set_max_request_within_thread(u->sink, u->write_block_size);
pa_sink_set_fixed_latency_within_thread(u->sink,
- FIXED_LATENCY_PLAYBACK_A2DP + pa_bytes_to_usec(u->block_size, &u->sample_spec));
+ FIXED_LATENCY_PLAYBACK_A2DP + pa_bytes_to_usec(u->write_block_size, &u->sample_spec));
}
/* from IO thread, except in SCO over PCM */
@@ -327,8 +334,7 @@ static int bt_transport_acquire(struct userdata *u, pa_bool_t start) {
return -1;
}
- /* FIXME: Handle in/out MTU properly when unix socket is not longer supported */
- u->stream_fd = pa_bluetooth_transport_acquire(t, accesstype, NULL, &u->link_mtu);
+ u->stream_fd = pa_bluetooth_transport_acquire(t, accesstype, &u->read_link_mtu, &u->write_link_mtu);
if (u->stream_fd < 0)
return -1;
@@ -395,7 +401,7 @@ static int sink_process_msg(pa_msgobject *o, int code, void *data, int64_t offse
pa_usec_t wi, ri;
ri = pa_smoother_get(u->read_smoother, pa_rtclock_now());
- wi = pa_bytes_to_usec(u->write_index + u->block_size, &u->sample_spec);
+ wi = pa_bytes_to_usec(u->write_index + u->write_block_size, &u->sample_spec);
*((pa_usec_t*) data) = wi > ri ? wi - ri : 0;
} else {
@@ -514,9 +520,9 @@ static int hsp_process_render(struct userdata *u) {
/* First, render some data */
if (!u->write_memchunk.memblock)
- pa_sink_render_full(u->sink, u->block_size, &u->write_memchunk);
+ pa_sink_render_full(u->sink, u->write_block_size, &u->write_memchunk);
- pa_assert(u->write_memchunk.length == u->block_size);
+ pa_assert(u->write_memchunk.length == u->write_block_size);
for (;;) {
ssize_t l;
@@ -578,7 +584,7 @@ static int hsp_process_push(struct userdata *u) {
pa_assert(u->source);
pa_assert(u->read_smoother);
- memchunk.memblock = pa_memblock_new(u->core->mempool, u->block_size);
+ memchunk.memblock = pa_memblock_new(u->core->mempool, u->read_block_size);
memchunk.index = memchunk.length = 0;
for (;;) {
@@ -645,7 +651,7 @@ static int hsp_process_push(struct userdata *u) {
pa_source_post(u->source, &memchunk);
- ret = 1;
+ ret = l;
break;
}
@@ -656,12 +662,14 @@ static int hsp_process_push(struct userdata *u) {
/* Run from IO thread */
static void a2dp_prepare_buffer(struct userdata *u) {
+ size_t min_buffer_size = PA_MAX(u->read_link_mtu, u->write_link_mtu);
+
pa_assert(u);
- if (u->a2dp.buffer_size >= u->link_mtu)
+ if (u->a2dp.buffer_size >= min_buffer_size)
return;
- u->a2dp.buffer_size = 2 * u->link_mtu;
+ u->a2dp.buffer_size = 2 * min_buffer_size;
pa_xfree(u->a2dp.buffer);
u->a2dp.buffer = pa_xmalloc(u->a2dp.buffer_size);
}
@@ -684,9 +692,9 @@ static int a2dp_process_render(struct userdata *u) {
/* First, render some data */
if (!u->write_memchunk.memblock)
- pa_sink_render_full(u->sink, u->block_size, &u->write_memchunk);
+ pa_sink_render_full(u->sink, u->write_block_size, &u->write_memchunk);
- pa_assert(u->write_memchunk.length == u->block_size);
+ pa_assert(u->write_memchunk.length == u->write_block_size);
a2dp_prepare_buffer(u);
@@ -809,7 +817,7 @@ static int a2dp_process_push(struct userdata *u) {
pa_assert(u->source);
pa_assert(u->read_smoother);
- memchunk.memblock = pa_memblock_new(u->core->mempool, u->block_size);
+ memchunk.memblock = pa_memblock_new(u->core->mempool, u->read_block_size);
memchunk.index = memchunk.length = 0;
for (;;) {
@@ -938,6 +946,7 @@ static void a2dp_reduce_bitpool(struct userdata *u)
static void thread_func(void *userdata) {
struct userdata *u = userdata;
unsigned do_write = 0;
+ unsigned pending_read_bytes = 0;
pa_bool_t writable = FALSE;
pa_assert(u);
@@ -980,7 +989,9 @@ static void thread_func(void *userdata) {
goto fail;
/* We just read something, so we are supposed to write something, too */
- do_write += n_read;
+ pending_read_bytes += n_read;
+ do_write += pending_read_bytes / u->write_block_size;
+ pending_read_bytes = pending_read_bytes % u->write_block_size;
}
}
@@ -1031,6 +1042,7 @@ static void thread_func(void *userdata) {
}
do_write = 1;
+ pending_read_bytes = 0;
}
}
@@ -1503,10 +1515,10 @@ static int add_sink(struct userdata *u) {
u->sink->userdata = u;
u->sink->parent.process_msg = sink_process_msg;
- pa_sink_set_max_request(u->sink, u->block_size);
+ pa_sink_set_max_request(u->sink, u->write_block_size);
pa_sink_set_fixed_latency(u->sink,
(u->profile == PROFILE_A2DP ? FIXED_LATENCY_PLAYBACK_A2DP : FIXED_LATENCY_PLAYBACK_HSP) +
- pa_bytes_to_usec(u->block_size, &u->sample_spec));
+ pa_bytes_to_usec(u->write_block_size, &u->sample_spec));
}
if (u->profile == PROFILE_HSP) {
@@ -1568,7 +1580,7 @@ static int add_source(struct userdata *u) {
pa_source_set_fixed_latency(u->source,
(u->profile == PROFILE_A2DP_SOURCE ? FIXED_LATENCY_RECORD_A2DP : FIXED_LATENCY_RECORD_HSP) +
- pa_bytes_to_usec(u->block_size, &u->sample_spec));
+ pa_bytes_to_usec(u->read_block_size, &u->sample_spec));
}
if ((u->profile == PROFILE_HSP) || (u->profile == PROFILE_HFGW)) {
@@ -1700,8 +1712,12 @@ static int bt_transport_config_a2dp(struct userdata *u) {
a2dp->codesize = sbc_get_codesize(&a2dp->sbc);
a2dp->frame_length = sbc_get_frame_length(&a2dp->sbc);
- u->block_size =
- (u->link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
+ u->read_block_size =
+ (u->read_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
+ / a2dp->frame_length * a2dp->codesize;
+
+ u->write_block_size =
+ (u->write_link_mtu - sizeof(struct rtp_header) - sizeof(struct rtp_payload))
/ a2dp->frame_length * a2dp->codesize;
pa_log_info("SBC parameters:\n\tallocation=%u\n\tsubbands=%u\n\tblocks=%u\n\tbitpool=%u\n",
@@ -1712,7 +1728,8 @@ static int bt_transport_config_a2dp(struct userdata *u) {
static int bt_transport_config(struct userdata *u) {
if (u->profile == PROFILE_HSP || u->profile == PROFILE_HFGW) {
- u->block_size = u->link_mtu;
+ u->read_block_size = u->read_link_mtu;
+ u->write_block_size = u->write_link_mtu;
u->sample_spec.format = PA_SAMPLE_S16LE;
u->sample_spec.channels = 1;
u->sample_spec.rate = 8000;
--
1.7.7.6
More information about the pulseaudio-discuss
mailing list