openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity
linux/drivers/media/video/ivtv/ivtv-fileops.c

1019 lines
30 KiB
C
Raw Blame History

/*
file operation functions
Copyright (C) 2003-2004 Kevin Thayer <nufan_wfk at yahoo.com>
Copyright (C) 2004 Chris Kennedy <c@groovy.org>
Copyright (C) 2005-2007 Hans Verkuil <hverkuil@xs4all.nl>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "ivtv-driver.h"
#include "ivtv-fileops.h"
#include "ivtv-i2c.h"
#include "ivtv-queue.h"
#include "ivtv-udma.h"
#include "ivtv-irq.h"
#include "ivtv-vbi.h"
#include "ivtv-mailbox.h"
#include "ivtv-routing.h"
#include "ivtv-streams.h"
#include "ivtv-yuv.h"
#include "ivtv-ioctl.h"
#include "ivtv-cards.h"
#include <media/saa7115.h>
/* This function tries to claim the stream for a specific file descriptor.
If no one else is using this stream then the stream is claimed and
associated VBI streams are also automatically claimed.
Possible error returns: -EBUSY if someone else has claimed
the stream or 0 on success. */
static int ivtv_claim_stream(struct ivtv_open_id *id, int type)
{
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[type];
struct ivtv_stream *s_vbi;
int vbi_type;
if (test_and_set_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
/* someone already claimed this stream */
if (s->id == id->open_id) {
/* yes, this file descriptor did. So that's OK. */
return 0;
}
if (s->id == -1 && (type == IVTV_DEC_STREAM_TYPE_VBI ||
type == IVTV_ENC_STREAM_TYPE_VBI)) {
/* VBI is handled already internally, now also assign
the file descriptor to this stream for external
reading of the stream. */
s->id = id->open_id;
IVTV_DEBUG_INFO("Start Read VBI\n");
return 0;
}
/* someone else is using this stream already */
IVTV_DEBUG_INFO("Stream %d is busy\n", type);
return -EBUSY;
}
s->id = id->open_id;
if (type == IVTV_DEC_STREAM_TYPE_VBI) {
/* Enable reinsertion interrupt */
ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
}
/* IVTV_DEC_STREAM_TYPE_MPG needs to claim IVTV_DEC_STREAM_TYPE_VBI,
IVTV_ENC_STREAM_TYPE_MPG needs to claim IVTV_ENC_STREAM_TYPE_VBI
(provided VBI insertion is on and sliced VBI is selected), for all
other streams we're done */
if (type == IVTV_DEC_STREAM_TYPE_MPG) {
vbi_type = IVTV_DEC_STREAM_TYPE_VBI;
} else if (type == IVTV_ENC_STREAM_TYPE_MPG &&
itv->vbi.insert_mpeg && !ivtv_raw_vbi(itv)) {
vbi_type = IVTV_ENC_STREAM_TYPE_VBI;
} else {
return 0;
}
s_vbi = &itv->streams[vbi_type];
if (!test_and_set_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags)) {
/* Enable reinsertion interrupt */
if (vbi_type == IVTV_DEC_STREAM_TYPE_VBI)
ivtv_clear_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
}
/* mark that it is used internally */
set_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags);
return 0;
}
/* This function releases a previously claimed stream. It will take into
account associated VBI streams. */
void ivtv_release_stream(struct ivtv_stream *s)
{
struct ivtv *itv = s->itv;
struct ivtv_stream *s_vbi;
s->id = -1;
if ((s->type == IVTV_DEC_STREAM_TYPE_VBI || s->type == IVTV_ENC_STREAM_TYPE_VBI) &&
test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
/* this stream is still in use internally */
return;
}
if (!test_and_clear_bit(IVTV_F_S_CLAIMED, &s->s_flags)) {
IVTV_DEBUG_WARN("Release stream %s not in use!\n", s->name);
return;
}
ivtv_flush_queues(s);
/* disable reinsertion interrupt */
if (s->type == IVTV_DEC_STREAM_TYPE_VBI)
ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
/* IVTV_DEC_STREAM_TYPE_MPG needs to release IVTV_DEC_STREAM_TYPE_VBI,
IVTV_ENC_STREAM_TYPE_MPG needs to release IVTV_ENC_STREAM_TYPE_VBI,
for all other streams we're done */
if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
s_vbi = &itv->streams[IVTV_DEC_STREAM_TYPE_VBI];
else if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
else
return;
/* clear internal use flag */
if (!test_and_clear_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags)) {
/* was already cleared */
return;
}
if (s_vbi->id != -1) {
/* VBI stream still claimed by a file descriptor */
return;
}
/* disable reinsertion interrupt */
if (s_vbi->type == IVTV_DEC_STREAM_TYPE_VBI)
ivtv_set_irq_mask(itv, IVTV_IRQ_DEC_VBI_RE_INSERT);
clear_bit(IVTV_F_S_CLAIMED, &s_vbi->s_flags);
ivtv_flush_queues(s_vbi);
}
static void ivtv_dualwatch(struct ivtv *itv)
{
struct v4l2_tuner vt;
u32 new_bitmap;
u32 new_stereo_mode;
const u32 stereo_mask = 0x0300;
const u32 dual = 0x0200;
new_stereo_mode = itv->params.audio_properties & stereo_mask;
memset(&vt, 0, sizeof(vt));
ivtv_call_all(itv, tuner, g_tuner, &vt);
if (vt.audmode == V4L2_TUNER_MODE_LANG1_LANG2 && (vt.rxsubchans & V4L2_TUNER_SUB_LANG2))
new_stereo_mode = dual;
if (new_stereo_mode == itv->dualwatch_stereo_mode)
return;
new_bitmap = new_stereo_mode | (itv->params.audio_properties & ~stereo_mask);
IVTV_DEBUG_INFO("dualwatch: change stereo flag from 0x%x to 0x%x. new audio_bitmask=0x%ux\n",
itv->dualwatch_stereo_mode, new_stereo_mode, new_bitmap);
if (ivtv_vapi(itv, CX2341X_ENC_SET_AUDIO_PROPERTIES, 1, new_bitmap) == 0) {
itv->dualwatch_stereo_mode = new_stereo_mode;
return;
}
IVTV_DEBUG_INFO("dualwatch: changing stereo flag failed\n");
}
static void ivtv_update_pgm_info(struct ivtv *itv)
{
u32 wr_idx = (read_enc(itv->pgm_info_offset) - itv->pgm_info_offset - 4) / 24;
int cnt;
int i = 0;
if (wr_idx >= itv->pgm_info_num) {
IVTV_DEBUG_WARN("Invalid PGM index %d (>= %d)\n", wr_idx, itv->pgm_info_num);
return;
}
cnt = (wr_idx + itv->pgm_info_num - itv->pgm_info_write_idx) % itv->pgm_info_num;
while (i < cnt) {
int idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
struct v4l2_enc_idx_entry *e = itv->pgm_info + idx;
u32 addr = itv->pgm_info_offset + 4 + idx * 24;
const int mapping[8] = { -1, V4L2_ENC_IDX_FRAME_I, V4L2_ENC_IDX_FRAME_P, -1,
V4L2_ENC_IDX_FRAME_B, -1, -1, -1 };
// 1=I, 2=P, 4=B
e->offset = read_enc(addr + 4) + ((u64)read_enc(addr + 8) << 32);
if (e->offset > itv->mpg_data_received) {
break;
}
e->offset += itv->vbi_data_inserted;
e->length = read_enc(addr);
e->pts = read_enc(addr + 16) + ((u64)(read_enc(addr + 20) & 1) << 32);
e->flags = mapping[read_enc(addr + 12) & 7];
i++;
}
itv->pgm_info_write_idx = (itv->pgm_info_write_idx + i) % itv->pgm_info_num;
}
static struct ivtv_buffer *ivtv_get_buffer(struct ivtv_stream *s, int non_block, int *err)
{
struct ivtv *itv = s->itv;
struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
struct ivtv_buffer *buf;
DEFINE_WAIT(wait);
*err = 0;
while (1) {
if (s->type == IVTV_ENC_STREAM_TYPE_MPG) {
/* Process pending program info updates and pending VBI data */
ivtv_update_pgm_info(itv);
if (time_after(jiffies,
itv->dualwatch_jiffies +
msecs_to_jiffies(1000))) {
itv->dualwatch_jiffies = jiffies;
ivtv_dualwatch(itv);
}
if (test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
!test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
while ((buf = ivtv_dequeue(s_vbi, &s_vbi->q_full))) {
/* byteswap and process VBI data */
ivtv_process_vbi_data(itv, buf, s_vbi->dma_pts, s_vbi->type);
ivtv_enqueue(s_vbi, buf, &s_vbi->q_free);
}
}
buf = &itv->vbi.sliced_mpeg_buf;
if (buf->readpos != buf->bytesused) {
return buf;
}
}
/* do we have leftover data? */
buf = ivtv_dequeue(s, &s->q_io);
if (buf)
return buf;
/* do we have new data? */
buf = ivtv_dequeue(s, &s->q_full);
if (buf) {
if ((buf->b_flags & IVTV_F_B_NEED_BUF_SWAP) == 0)
return buf;
buf->b_flags &= ~IVTV_F_B_NEED_BUF_SWAP;
if (s->type == IVTV_ENC_STREAM_TYPE_MPG)
/* byteswap MPG data */
ivtv_buf_swap(buf);
else if (s->type != IVTV_DEC_STREAM_TYPE_VBI) {
/* byteswap and process VBI data */
ivtv_process_vbi_data(itv, buf, s->dma_pts, s->type);
}
return buf;
}
/* return if end of stream */
if (s->type != IVTV_DEC_STREAM_TYPE_VBI && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
IVTV_DEBUG_INFO("EOS %s\n", s->name);
return NULL;
}
/* return if file was opened with O_NONBLOCK */
if (non_block) {
*err = -EAGAIN;
return NULL;
}
/* wait for more data to arrive */
prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
/* New buffers might have become available before we were added to the waitqueue */
if (!s->q_full.buffers)
schedule();
finish_wait(&s->waitq, &wait);
if (signal_pending(current)) {
/* return if a signal was received */
IVTV_DEBUG_INFO("User stopped %s\n", s->name);
*err = -EINTR;
return NULL;
}
}
}
static void ivtv_setup_sliced_vbi_buf(struct ivtv *itv)
{
int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
itv->vbi.sliced_mpeg_buf.buf = itv->vbi.sliced_mpeg_data[idx];
itv->vbi.sliced_mpeg_buf.bytesused = itv->vbi.sliced_mpeg_size[idx];
itv->vbi.sliced_mpeg_buf.readpos = 0;
}
static size_t ivtv_copy_buf_to_user(struct ivtv_stream *s, struct ivtv_buffer *buf,
char __user *ubuf, size_t ucount)
{
struct ivtv *itv = s->itv;
size_t len = buf->bytesused - buf->readpos;
if (len > ucount) len = ucount;
if (itv->vbi.insert_mpeg && s->type == IVTV_ENC_STREAM_TYPE_MPG &&
!ivtv_raw_vbi(itv) && buf != &itv->vbi.sliced_mpeg_buf) {
const char *start = buf->buf + buf->readpos;
const char *p = start + 1;
const u8 *q;
u8 ch = itv->search_pack_header ? 0xba : 0xe0;
int stuffing, i;
while (start + len > p && (q = memchr(p, 0, start + len - p))) {
p = q + 1;
if ((char *)q + 15 >= buf->buf + buf->bytesused ||
q[1] != 0 || q[2] != 1 || q[3] != ch) {
continue;
}
if (!itv->search_pack_header) {
if ((q[6] & 0xc0) != 0x80)
continue;
if (((q[7] & 0xc0) == 0x80 && (q[9] & 0xf0) == 0x20) ||
((q[7] & 0xc0) == 0xc0 && (q[9] & 0xf0) == 0x30)) {
ch = 0xba;
itv->search_pack_header = 1;
p = q + 9;
}
continue;
}
stuffing = q[13] & 7;
/* all stuffing bytes must be 0xff */
for (i = 0; i < stuffing; i++)
if (q[14 + i] != 0xff)
break;
if (i == stuffing && (q[4] & 0xc4) == 0x44 && (q[12] & 3) == 3 &&
q[14 + stuffing] == 0 && q[15 + stuffing] == 0 &&
q[16 + stuffing] == 1) {
itv->search_pack_header = 0;
len = (char *)q - start;
ivtv_setup_sliced_vbi_buf(itv);
break;
}
}
}
if (copy_to_user(ubuf, (u8 *)buf->buf + buf->readpos, len)) {
IVTV_DEBUG_WARN("copy %zd bytes to user failed for %s\n", len, s->name);
return -EFAULT;
}
/*IVTV_INFO("copied %lld %d %d %d %d %d vbi %d\n", itv->mpg_data_received, len, ucount,
buf->readpos, buf->bytesused, buf->bytesused - buf->readpos - len,
buf == &itv->vbi.sliced_mpeg_buf); */
buf->readpos += len;
if (s->type == IVTV_ENC_STREAM_TYPE_MPG && buf != &itv->vbi.sliced_mpeg_buf)
itv->mpg_data_received += len;
return len;
}
static ssize_t ivtv_read(struct ivtv_stream *s, char __user *ubuf, size_t tot_count, int non_block)
{
struct ivtv *itv = s->itv;
size_t tot_written = 0;
int single_frame = 0;
if (atomic_read(&itv->capturing) == 0 && s->id == -1) {
/* shouldn't happen */
IVTV_DEBUG_WARN("Stream %s not initialized before read\n", s->name);
return -EIO;
}
/* Each VBI buffer is one frame, the v4l2 API says that for VBI the frames should
arrive one-by-one, so make sure we never output more than one VBI frame at a time */
if (s->type == IVTV_DEC_STREAM_TYPE_VBI ||
(s->type == IVTV_ENC_STREAM_TYPE_VBI && !ivtv_raw_vbi(itv)))
single_frame = 1;
for (;;) {
struct ivtv_buffer *buf;
int rc;
buf = ivtv_get_buffer(s, non_block, &rc);
/* if there is no data available... */
if (buf == NULL) {
/* if we got data, then return that regardless */
if (tot_written)
break;
/* EOS condition */
if (rc == 0) {
clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
ivtv_release_stream(s);
}
/* set errno */
return rc;
}
rc = ivtv_copy_buf_to_user(s, buf, ubuf + tot_written, tot_count - tot_written);
if (buf != &itv->vbi.sliced_mpeg_buf) {
ivtv_enqueue(s, buf, (buf->readpos == buf->bytesused) ? &s->q_free : &s->q_io);
}
else if (buf->readpos == buf->bytesused) {
int idx = itv->vbi.inserted_frame % IVTV_VBI_FRAMES;
itv->vbi.sliced_mpeg_size[idx] = 0;
itv->vbi.inserted_frame++;
itv->vbi_data_inserted += buf->bytesused;
}
if (rc < 0)
return rc;
tot_written += rc;
if (tot_written == tot_count || single_frame)
break;
}
return tot_written;
}
static ssize_t ivtv_read_pos(struct ivtv_stream *s, char __user *ubuf, size_t count,
loff_t *pos, int non_block)
{
ssize_t rc = count ? ivtv_read(s, ubuf, count, non_block) : 0;
struct ivtv *itv = s->itv;
IVTV_DEBUG_HI_FILE("read %zd from %s, got %zd\n", count, s->name, rc);
if (rc > 0)
pos += rc;
return rc;
}
int ivtv_start_capture(struct ivtv_open_id *id)
{
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
struct ivtv_stream *s_vbi;
if (s->type == IVTV_ENC_STREAM_TYPE_RAD ||
s->type == IVTV_DEC_STREAM_TYPE_MPG ||
s->type == IVTV_DEC_STREAM_TYPE_YUV ||
s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
/* you cannot read from these stream types. */
return -EPERM;
}
/* Try to claim this stream. */
if (ivtv_claim_stream(id, s->type))
return -EBUSY;
/* This stream does not need to start capturing */
if (s->type == IVTV_DEC_STREAM_TYPE_VBI) {
set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
return 0;
}
/* If capture is already in progress, then we also have to
do nothing extra. */
if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) || test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
return 0;
}
/* Start VBI capture if required */
s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
test_bit(IVTV_F_S_INTERNAL_USE, &s_vbi->s_flags) &&
!test_and_set_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
/* Note: the IVTV_ENC_STREAM_TYPE_VBI is claimed
automatically when the MPG stream is claimed.
We only need to start the VBI capturing. */
if (ivtv_start_v4l2_encode_stream(s_vbi)) {
IVTV_DEBUG_WARN("VBI capture start failed\n");
/* Failure, clean up and return an error */
clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
/* also releases the associated VBI stream */
ivtv_release_stream(s);
return -EIO;
}
IVTV_DEBUG_INFO("VBI insertion started\n");
}
/* Tell the card to start capturing */
if (!ivtv_start_v4l2_encode_stream(s)) {
/* We're done */
set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
/* Resume a possibly paused encoder */
if (test_and_clear_bit(IVTV_F_I_ENC_PAUSED, &itv->i_flags))
ivtv_vapi(itv, CX2341X_ENC_PAUSE_ENCODER, 1, 1);
return 0;
}
/* failure, clean up */
IVTV_DEBUG_WARN("Failed to start capturing for stream %s\n", s->name);
/* Note: the IVTV_ENC_STREAM_TYPE_VBI is released
automatically when the MPG stream is released.
We only need to stop the VBI capturing. */
if (s->type == IVTV_ENC_STREAM_TYPE_MPG &&
test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags)) {
ivtv_stop_v4l2_encode_stream(s_vbi, 0);
clear_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags);
}
clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
ivtv_release_stream(s);
return -EIO;
}
ssize_t ivtv_v4l2_read(struct file * filp, char __user *buf, size_t count, loff_t * pos)
{
struct ivtv_open_id *id = filp->private_data;
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
int rc;
IVTV_DEBUG_HI_FILE("read %zd bytes from %s\n", count, s->name);
mutex_lock(&itv->serialize_lock);
rc = ivtv_start_capture(id);
mutex_unlock(&itv->serialize_lock);
if (rc)
return rc;
return ivtv_read_pos(s, buf, count, pos, filp->f_flags & O_NONBLOCK);
}
int ivtv_start_decoding(struct ivtv_open_id *id, int speed)
{
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
if (atomic_read(&itv->decoding) == 0) {
if (ivtv_claim_stream(id, s->type)) {
/* someone else is using this stream already */
IVTV_DEBUG_WARN("start decode, stream already claimed\n");
return -EBUSY;
}
ivtv_start_v4l2_decode_stream(s, 0);
}
if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
return ivtv_set_speed(itv, speed);
return 0;
}
ssize_t ivtv_v4l2_write(struct file *filp, const char __user *user_buf, size_t count, loff_t *pos)
{
struct ivtv_open_id *id = filp->private_data;
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
struct yuv_playback_info *yi = &itv->yuv_info;
struct ivtv_buffer *buf;
struct ivtv_queue q;
int bytes_written = 0;
int mode;
int rc;
DEFINE_WAIT(wait);
IVTV_DEBUG_HI_FILE("write %zd bytes to %s\n", count, s->name);
if (s->type != IVTV_DEC_STREAM_TYPE_MPG &&
s->type != IVTV_DEC_STREAM_TYPE_YUV &&
s->type != IVTV_DEC_STREAM_TYPE_VOUT)
/* not decoder streams */
return -EPERM;
/* Try to claim this stream */
if (ivtv_claim_stream(id, s->type))
return -EBUSY;
/* This stream does not need to start any decoding */
if (s->type == IVTV_DEC_STREAM_TYPE_VOUT) {
int elems = count / sizeof(struct v4l2_sliced_vbi_data);
set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
ivtv_write_vbi(itv, (const struct v4l2_sliced_vbi_data *)user_buf, elems);
return elems * sizeof(struct v4l2_sliced_vbi_data);
}
mode = s->type == IVTV_DEC_STREAM_TYPE_MPG ? OUT_MPG : OUT_YUV;
if (ivtv_set_output_mode(itv, mode) != mode) {
ivtv_release_stream(s);
return -EBUSY;
}
ivtv_queue_init(&q);
set_bit(IVTV_F_S_APPL_IO, &s->s_flags);
/* Start decoder (returns 0 if already started) */
mutex_lock(&itv->serialize_lock);
rc = ivtv_start_decoding(id, itv->speed);
mutex_unlock(&itv->serialize_lock);
if (rc) {
IVTV_DEBUG_WARN("Failed start decode stream %s\n", s->name);
/* failure, clean up */
clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
return rc;
}
retry:
/* If possible, just DMA the entire frame - Check the data transfer size
since we may get here before the stream has been fully set-up */
if (mode == OUT_YUV && s->q_full.length == 0 && itv->dma_data_req_size) {
while (count >= itv->dma_data_req_size) {
rc = ivtv_yuv_udma_stream_frame(itv, (void __user *)user_buf);
if (rc < 0)
return rc;
bytes_written += itv->dma_data_req_size;
user_buf += itv->dma_data_req_size;
count -= itv->dma_data_req_size;
}
if (count == 0) {
IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
return bytes_written;
}
}
for (;;) {
/* Gather buffers */
while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_io)))
ivtv_enqueue(s, buf, &q);
while (q.length - q.bytesused < count && (buf = ivtv_dequeue(s, &s->q_free))) {
ivtv_enqueue(s, buf, &q);
}
if (q.buffers)
break;
if (filp->f_flags & O_NONBLOCK)
return -EAGAIN;
prepare_to_wait(&s->waitq, &wait, TASK_INTERRUPTIBLE);
/* New buffers might have become free before we were added to the waitqueue */
if (!s->q_free.buffers)
schedule();
finish_wait(&s->waitq, &wait);
if (signal_pending(current)) {
IVTV_DEBUG_INFO("User stopped %s\n", s->name);
return -EINTR;
}
}
/* copy user data into buffers */
while ((buf = ivtv_dequeue(s, &q))) {
/* yuv is a pain. Don't copy more data than needed for a single
frame, otherwise we lose sync with the incoming stream */
if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
yi->stream_size + count > itv->dma_data_req_size)
rc = ivtv_buf_copy_from_user(s, buf, user_buf,
itv->dma_data_req_size - yi->stream_size);
else
rc = ivtv_buf_copy_from_user(s, buf, user_buf, count);
/* Make sure we really got all the user data */
if (rc < 0) {
ivtv_queue_move(s, &q, NULL, &s->q_free, 0);
return rc;
}
user_buf += rc;
count -= rc;
bytes_written += rc;
if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
yi->stream_size += rc;
/* If we have a complete yuv frame, break loop now */
if (yi->stream_size == itv->dma_data_req_size) {
ivtv_enqueue(s, buf, &s->q_full);
yi->stream_size = 0;
break;
}
}
if (buf->bytesused != s->buf_size) {
/* incomplete, leave in q_io for next time */
ivtv_enqueue(s, buf, &s->q_io);
break;
}
/* Byteswap MPEG buffer */
if (s->type == IVTV_DEC_STREAM_TYPE_MPG)
ivtv_buf_swap(buf);
ivtv_enqueue(s, buf, &s->q_full);
}
if (test_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags)) {
if (s->q_full.length >= itv->dma_data_req_size) {
int got_sig;
if (mode == OUT_YUV)
ivtv_yuv_setup_stream_frame(itv);
prepare_to_wait(&itv->dma_waitq, &wait, TASK_INTERRUPTIBLE);
while (!(got_sig = signal_pending(current)) &&
test_bit(IVTV_F_S_DMA_PENDING, &s->s_flags)) {
schedule();
}
finish_wait(&itv->dma_waitq, &wait);
if (got_sig) {
IVTV_DEBUG_INFO("User interrupted %s\n", s->name);
return -EINTR;
}
clear_bit(IVTV_F_S_NEEDS_DATA, &s->s_flags);
ivtv_queue_move(s, &s->q_full, NULL, &s->q_predma, itv->dma_data_req_size);
ivtv_dma_stream_dec_prepare(s, itv->dma_data_req_offset + IVTV_DECODER_OFFSET, 1);
}
}
/* more user data is available, wait until buffers become free
to transfer the rest. */
if (count && !(filp->f_flags & O_NONBLOCK))
goto retry;
IVTV_DEBUG_HI_FILE("Wrote %d bytes to %s (%d)\n", bytes_written, s->name, s->q_full.bytesused);
return bytes_written;
}
unsigned int ivtv_v4l2_dec_poll(struct file *filp, poll_table *wait)
{
struct ivtv_open_id *id = filp->private_data;
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
int res = 0;
/* add stream's waitq to the poll list */
IVTV_DEBUG_HI_FILE("Decoder poll\n");
poll_wait(filp, &s->waitq, wait);
set_bit(IVTV_F_I_EV_VSYNC_ENABLED, &itv->i_flags);
if (test_bit(IVTV_F_I_EV_VSYNC, &itv->i_flags) ||
test_bit(IVTV_F_I_EV_DEC_STOPPED, &itv->i_flags))
res = POLLPRI;
/* Allow write if buffers are available for writing */
if (s->q_free.buffers)
res |= POLLOUT | POLLWRNORM;
return res;
}
unsigned int ivtv_v4l2_enc_poll(struct file *filp, poll_table * wait)
{
struct ivtv_open_id *id = filp->private_data;
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
int eof = test_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
/* Start a capture if there is none */
if (!eof && !test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
int rc;
mutex_lock(&itv->serialize_lock);
rc = ivtv_start_capture(id);
mutex_unlock(&itv->serialize_lock);
if (rc) {
IVTV_DEBUG_INFO("Could not start capture for %s (%d)\n",
s->name, rc);
return POLLERR;
}
IVTV_DEBUG_FILE("Encoder poll started capture\n");
}
/* add stream's waitq to the poll list */
IVTV_DEBUG_HI_FILE("Encoder poll\n");
poll_wait(filp, &s->waitq, wait);
if (s->q_full.length || s->q_io.length)
return POLLIN | POLLRDNORM;
if (eof)
return POLLHUP;
return 0;
}
void ivtv_stop_capture(struct ivtv_open_id *id, int gop_end)
{
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
IVTV_DEBUG_FILE("close() of %s\n", s->name);
/* 'Unclaim' this stream */
/* Stop capturing */
if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
struct ivtv_stream *s_vbi = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI];
IVTV_DEBUG_INFO("close stopping capture\n");
/* Special case: a running VBI capture for VBI insertion
in the mpeg stream. Need to stop that too. */
if (id->type == IVTV_ENC_STREAM_TYPE_MPG &&
test_bit(IVTV_F_S_STREAMING, &s_vbi->s_flags) &&
!test_bit(IVTV_F_S_APPL_IO, &s_vbi->s_flags)) {
IVTV_DEBUG_INFO("close stopping embedded VBI capture\n");
ivtv_stop_v4l2_encode_stream(s_vbi, 0);
}
if ((id->type == IVTV_DEC_STREAM_TYPE_VBI ||
id->type == IVTV_ENC_STREAM_TYPE_VBI) &&
test_bit(IVTV_F_S_INTERNAL_USE, &s->s_flags)) {
/* Also used internally, don't stop capturing */
s->id = -1;
}
else {
ivtv_stop_v4l2_encode_stream(s, gop_end);
}
}
if (!gop_end) {
clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
ivtv_release_stream(s);
}
}
static void ivtv_stop_decoding(struct ivtv_open_id *id, int flags, u64 pts)
{
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
IVTV_DEBUG_FILE("close() of %s\n", s->name);
/* Stop decoding */
if (test_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
IVTV_DEBUG_INFO("close stopping decode\n");
ivtv_stop_v4l2_decode_stream(s, flags, pts);
itv->output_mode = OUT_NONE;
}
clear_bit(IVTV_F_S_APPL_IO, &s->s_flags);
clear_bit(IVTV_F_S_STREAMOFF, &s->s_flags);
if (id->type == IVTV_DEC_STREAM_TYPE_YUV && test_bit(IVTV_F_I_DECODING_YUV, &itv->i_flags)) {
/* Restore registers we've changed & clean up any mess we've made */
ivtv_yuv_close(itv);
}
if (itv->output_mode == OUT_UDMA_YUV && id->yuv_frames)
itv->output_mode = OUT_NONE;
itv->speed = 0;
clear_bit(IVTV_F_I_DEC_PAUSED, &itv->i_flags);
ivtv_release_stream(s);
}
int ivtv_v4l2_close(struct file *filp)
{
struct ivtv_open_id *id = filp->private_data;
struct ivtv *itv = id->itv;
struct ivtv_stream *s = &itv->streams[id->type];
IVTV_DEBUG_FILE("close %s\n", s->name);
v4l2_prio_close(&itv->prio, &id->prio);
/* Easy case first: this stream was never claimed by us */
if (s->id != id->open_id) {
kfree(id);
return 0;
}
/* 'Unclaim' this stream */
/* Stop radio */
mutex_lock(&itv->serialize_lock);
if (id->type == IVTV_ENC_STREAM_TYPE_RAD) {
/* Closing radio device, return to TV mode */
ivtv_mute(itv);
/* Mark that the radio is no longer in use */
clear_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
/* Switch tuner to TV */
ivtv_call_all(itv, tuner, s_std, itv->std);
/* Select correct audio input (i.e. TV tuner or Line in) */
ivtv_audio_set_io(itv);
if (itv->hw_flags & IVTV_HW_SAA711X)
{
struct v4l2_crystal_freq crystal_freq;
crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
crystal_freq.flags = 0;
ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq, &crystal_freq);
}
if (atomic_read(&itv->capturing) > 0) {
/* Undo video mute */
ivtv_vapi(itv, CX2341X_ENC_MUTE_VIDEO, 1,
itv->params.video_mute | (itv->params.video_mute_yuv << 8));
}
/* Done! Unmute and continue. */
ivtv_unmute(itv);
ivtv_release_stream(s);
} else if (s->type >= IVTV_DEC_STREAM_TYPE_MPG) {
struct ivtv_stream *s_vout = &itv->streams[IVTV_DEC_STREAM_TYPE_VOUT];
ivtv_stop_decoding(id, VIDEO_CMD_STOP_TO_BLACK | VIDEO_CMD_STOP_IMMEDIATELY, 0);
/* If all output streams are closed, and if the user doesn't have
IVTV_DEC_STREAM_TYPE_VOUT open, then disable CC on TV-out. */
if (itv->output_mode == OUT_NONE && !test_bit(IVTV_F_S_APPL_IO, &s_vout->s_flags)) {
/* disable CC on TV-out */
ivtv_disable_cc(itv);
}
} else {
ivtv_stop_capture(id, 0);
}
kfree(id);
mutex_unlock(&itv->serialize_lock);
return 0;
}
static int ivtv_serialized_open(struct ivtv_stream *s, struct file *filp)
{
struct ivtv *itv = s->itv;
struct ivtv_open_id *item;
IVTV_DEBUG_FILE("open %s\n", s->name);
if (s->type == IVTV_DEC_STREAM_TYPE_MPG &&
test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_YUV].s_flags))
return -EBUSY;
if (s->type == IVTV_DEC_STREAM_TYPE_YUV &&
test_bit(IVTV_F_S_CLAIMED, &itv->streams[IVTV_DEC_STREAM_TYPE_MPG].s_flags))
return -EBUSY;
if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
if (read_reg(0x82c) == 0) {
IVTV_ERR("Tried to open YUV output device but need to send data to mpeg decoder before it can be used\n");
/* return -ENODEV; */
}
ivtv_udma_alloc(itv);
}
/* Allocate memory */
item = kmalloc(sizeof(struct ivtv_open_id), GFP_KERNEL);
if (NULL == item) {
IVTV_DEBUG_WARN("nomem on v4l2 open\n");
return -ENOMEM;
}
item->itv = itv;
item->type = s->type;
v4l2_prio_open(&itv->prio, &item->prio);
item->open_id = itv->open_id++;
filp->private_data = item;
if (item->type == IVTV_ENC_STREAM_TYPE_RAD) {
/* Try to claim this stream */
if (ivtv_claim_stream(item, item->type)) {
/* No, it's already in use */
kfree(item);
return -EBUSY;
}
if (!test_bit(IVTV_F_I_RADIO_USER, &itv->i_flags)) {
if (atomic_read(&itv->capturing) > 0) {
/* switching to radio while capture is
in progress is not polite */
ivtv_release_stream(s);
kfree(item);
return -EBUSY;
}
}
/* Mark that the radio is being used. */
set_bit(IVTV_F_I_RADIO_USER, &itv->i_flags);
/* We have the radio */
ivtv_mute(itv);
/* Switch tuner to radio */
ivtv_call_all(itv, tuner, s_radio);
/* Select the correct audio input (i.e. radio tuner) */
ivtv_audio_set_io(itv);
if (itv->hw_flags & IVTV_HW_SAA711X) {
struct v4l2_crystal_freq crystal_freq;
crystal_freq.freq = SAA7115_FREQ_32_11_MHZ;
crystal_freq.flags = SAA7115_FREQ_FL_APLL;
ivtv_call_hw(itv, IVTV_HW_SAA711X, video, s_crystal_freq, &crystal_freq);
}
/* Done! Unmute and continue. */
ivtv_unmute(itv);
}
/* YUV or MPG Decoding Mode? */
if (s->type == IVTV_DEC_STREAM_TYPE_MPG) {
clear_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
} else if (s->type == IVTV_DEC_STREAM_TYPE_YUV) {
set_bit(IVTV_F_I_DEC_YUV, &itv->i_flags);
/* For yuv, we need to know the dma size before we start */
itv->dma_data_req_size =
1080 * ((itv->yuv_info.v4l2_src_h + 31) & ~31);
itv->yuv_info.stream_size = 0;
}
return 0;
}
int ivtv_v4l2_open(struct file *filp)
{
int res;
struct ivtv *itv = NULL;
struct ivtv_stream *s = NULL;
struct video_device *vdev = video_devdata(filp);
s = video_get_drvdata(vdev);
itv = s->itv;
mutex_lock(&itv->serialize_lock);
if (ivtv_init_on_first_open(itv)) {
IVTV_ERR("Failed to initialize on minor %d\n",
vdev->minor);
mutex_unlock(&itv->serialize_lock);
return -ENXIO;
}
res = ivtv_serialized_open(s, filp);
mutex_unlock(&itv->serialize_lock);
return res;
}
void ivtv_mute(struct ivtv *itv)
{
if (atomic_read(&itv->capturing))
ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 1);
IVTV_DEBUG_INFO("Mute\n");
}
void ivtv_unmute(struct ivtv *itv)
{
if (atomic_read(&itv->capturing)) {
ivtv_msleep_timeout(100, 0);
ivtv_vapi(itv, CX2341X_ENC_MISC, 1, 12);
ivtv_vapi(itv, CX2341X_ENC_MUTE_AUDIO, 1, 0);
}
IVTV_DEBUG_INFO("Unmute\n");
}
Reference in New Issue View Git Blame Copy Permalink