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path: root/drivers/media/video/cx18/cx18-fileops.c
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Diffstat (limited to 'drivers/media/video/cx18/cx18-fileops.c')
-rw-r--r--drivers/media/video/cx18/cx18-fileops.c132
1 files changed, 98 insertions, 34 deletions
diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c
index 04d9c2508b86..4e278db31cc9 100644
--- a/drivers/media/video/cx18/cx18-fileops.c
+++ b/drivers/media/video/cx18/cx18-fileops.c
@@ -166,11 +166,12 @@ static void cx18_dualwatch(struct cx18 *cx)
}
-static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, int *err)
+static struct cx18_mdl *cx18_get_mdl(struct cx18_stream *s, int non_block,
+ int *err)
{
struct cx18 *cx = s->cx;
struct cx18_stream *s_vbi = &cx->streams[CX18_ENC_STREAM_TYPE_VBI];
- struct cx18_buffer *buf;
+ struct cx18_mdl *mdl;
DEFINE_WAIT(wait);
*err = 0;
@@ -185,32 +186,33 @@ static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block,
}
if (test_bit(CX18_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
!test_bit(CX18_F_S_APPL_IO, &s_vbi->s_flags)) {
- while ((buf = cx18_dequeue(s_vbi, &s_vbi->q_full))) {
+ while ((mdl = cx18_dequeue(s_vbi,
+ &s_vbi->q_full))) {
/* byteswap and process VBI data */
- cx18_process_vbi_data(cx, buf,
+ cx18_process_vbi_data(cx, mdl,
s_vbi->type);
- cx18_stream_put_buf_fw(s_vbi, buf);
+ cx18_stream_put_mdl_fw(s_vbi, mdl);
}
}
- buf = &cx->vbi.sliced_mpeg_buf;
- if (buf->readpos != buf->bytesused)
- return buf;
+ mdl = &cx->vbi.sliced_mpeg_mdl;
+ if (mdl->readpos != mdl->bytesused)
+ return mdl;
}
/* do we have new data? */
- buf = cx18_dequeue(s, &s->q_full);
- if (buf) {
- if (!test_and_clear_bit(CX18_F_B_NEED_BUF_SWAP,
- &buf->b_flags))
- return buf;
+ mdl = cx18_dequeue(s, &s->q_full);
+ if (mdl) {
+ if (!test_and_clear_bit(CX18_F_M_NEED_SWAP,
+ &mdl->m_flags))
+ return mdl;
if (s->type == CX18_ENC_STREAM_TYPE_MPG)
/* byteswap MPG data */
- cx18_buf_swap(buf);
+ cx18_mdl_swap(mdl);
else {
/* byteswap and process VBI data */
- cx18_process_vbi_data(cx, buf, s->type);
+ cx18_process_vbi_data(cx, mdl, s->type);
}
- return buf;
+ return mdl;
}
/* return if end of stream */
@@ -229,7 +231,7 @@ static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block,
prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
/* New buffers might have become available before we were added
to the waitqueue */
- if (!atomic_read(&s->q_full.buffers))
+ if (!atomic_read(&s->q_full.depth))
schedule();
finish_wait(&s->waitq, &wait);
if (signal_pending(current)) {
@@ -241,21 +243,28 @@ static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block,
}
}
-static void cx18_setup_sliced_vbi_buf(struct cx18 *cx)
+static void cx18_setup_sliced_vbi_mdl(struct cx18 *cx)
{
+ struct cx18_mdl *mdl = &cx->vbi.sliced_mpeg_mdl;
+ struct cx18_buffer *buf = &cx->vbi.sliced_mpeg_buf;
int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
- cx->vbi.sliced_mpeg_buf.buf = cx->vbi.sliced_mpeg_data[idx];
- cx->vbi.sliced_mpeg_buf.bytesused = cx->vbi.sliced_mpeg_size[idx];
- cx->vbi.sliced_mpeg_buf.readpos = 0;
+ buf->buf = cx->vbi.sliced_mpeg_data[idx];
+ buf->bytesused = cx->vbi.sliced_mpeg_size[idx];
+ buf->readpos = 0;
+
+ mdl->curr_buf = NULL;
+ mdl->bytesused = cx->vbi.sliced_mpeg_size[idx];
+ mdl->readpos = 0;
}
static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
- struct cx18_buffer *buf, char __user *ubuf, size_t ucount)
+ struct cx18_buffer *buf, char __user *ubuf, size_t ucount, bool *stop)
{
struct cx18 *cx = s->cx;
size_t len = buf->bytesused - buf->readpos;
+ *stop = false;
if (len > ucount)
len = ucount;
if (cx->vbi.insert_mpeg && s->type == CX18_ENC_STREAM_TYPE_MPG &&
@@ -335,7 +344,8 @@ static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
/* We declare we actually found a Program Pack*/
cx->search_pack_header = 0; /* expect vid PES */
len = (char *)q - start;
- cx18_setup_sliced_vbi_buf(cx);
+ cx18_setup_sliced_vbi_mdl(cx);
+ *stop = true;
break;
}
}
@@ -352,6 +362,60 @@ static size_t cx18_copy_buf_to_user(struct cx18_stream *s,
return len;
}
+/**
+ * list_entry_is_past_end - check if a previous loop cursor is off list end
+ * @pos: the type * previously used as a loop cursor.
+ * @head: the head for your list.
+ * @member: the name of the list_struct within the struct.
+ *
+ * Check if the entry's list_head is the head of the list, thus it's not a
+ * real entry but was the loop cursor that walked past the end
+ */
+#define list_entry_is_past_end(pos, head, member) \
+ (&pos->member == (head))
+
+static size_t cx18_copy_mdl_to_user(struct cx18_stream *s,
+ struct cx18_mdl *mdl, char __user *ubuf, size_t ucount)
+{
+ size_t tot_written = 0;
+ int rc;
+ bool stop = false;
+
+ if (mdl->curr_buf == NULL)
+ mdl->curr_buf = list_first_entry(&mdl->buf_list,
+ struct cx18_buffer, list);
+
+ if (list_entry_is_past_end(mdl->curr_buf, &mdl->buf_list, list)) {
+ /*
+ * For some reason we've exhausted the buffers, but the MDL
+ * object still said some data was unread.
+ * Fix that and bail out.
+ */
+ mdl->readpos = mdl->bytesused;
+ return 0;
+ }
+
+ list_for_each_entry_from(mdl->curr_buf, &mdl->buf_list, list) {
+
+ if (mdl->curr_buf->readpos >= mdl->curr_buf->bytesused)
+ continue;
+
+ rc = cx18_copy_buf_to_user(s, mdl->curr_buf, ubuf + tot_written,
+ ucount - tot_written, &stop);
+ if (rc < 0)
+ return rc;
+ mdl->readpos += rc;
+ tot_written += rc;
+
+ if (stop || /* Forced stopping point for VBI insertion */
+ tot_written >= ucount || /* Reader request statisfied */
+ mdl->curr_buf->readpos < mdl->curr_buf->bytesused ||
+ mdl->readpos >= mdl->bytesused) /* MDL buffers drained */
+ break;
+ }
+ return tot_written;
+}
+
static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
size_t tot_count, int non_block)
{
@@ -373,12 +437,12 @@ static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
single_frame = 1;
for (;;) {
- struct cx18_buffer *buf;
+ struct cx18_mdl *mdl;
int rc;
- buf = cx18_get_buffer(s, non_block, &rc);
+ mdl = cx18_get_mdl(s, non_block, &rc);
/* if there is no data available... */
- if (buf == NULL) {
+ if (mdl == NULL) {
/* if we got data, then return that regardless */
if (tot_written)
break;
@@ -392,20 +456,20 @@ static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf,
return rc;
}
- rc = cx18_copy_buf_to_user(s, buf, ubuf + tot_written,
+ rc = cx18_copy_mdl_to_user(s, mdl, ubuf + tot_written,
tot_count - tot_written);
- if (buf != &cx->vbi.sliced_mpeg_buf) {
- if (buf->readpos == buf->bytesused)
- cx18_stream_put_buf_fw(s, buf);
+ if (mdl != &cx->vbi.sliced_mpeg_mdl) {
+ if (mdl->readpos == mdl->bytesused)
+ cx18_stream_put_mdl_fw(s, mdl);
else
- cx18_push(s, buf, &s->q_full);
- } else if (buf->readpos == buf->bytesused) {
+ cx18_push(s, mdl, &s->q_full);
+ } else if (mdl->readpos == mdl->bytesused) {
int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES;
cx->vbi.sliced_mpeg_size[idx] = 0;
cx->vbi.inserted_frame++;
- cx->vbi_data_inserted += buf->bytesused;
+ cx->vbi_data_inserted += mdl->bytesused;
}
if (rc < 0)
return rc;
@@ -543,7 +607,7 @@ unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait)
CX18_DEBUG_HI_FILE("Encoder poll\n");
poll_wait(filp, &s->waitq, wait);
- if (atomic_read(&s->q_full.buffers))
+ if (atomic_read(&s->q_full.depth))
return POLLIN | POLLRDNORM;
if (eof)
return POLLHUP;
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-24 06:35:50 +0300