From: Hans Verkuil Date: Wed, 3 Sep 2008 19:47:14 +0000 (-0300) Subject: V4L/DVB (8648): ivtv: improve CC support X-Git-Tag: v2.6.27-rc6~37^2~4^2~86 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d526afe06b285006c63ed8f2eba9589f04e3283a;p=linux-2.6 V4L/DVB (8648): ivtv: improve CC support - change the work-queue to a single threaded high prio workqueue - use DMA instead of PIO for the sliced VBI data. - remove some incorrect tests - increase the internal VBI capture queue size for sliced VBI packets - ignore duplicate VBI lines With these changes it should finally be possible to get reliable closed captions. Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/ivtv/ivtv-driver.c b/drivers/media/video/ivtv/ivtv-driver.c index aea1664948..4afc7ea07e 100644 --- a/drivers/media/video/ivtv/ivtv-driver.c +++ b/drivers/media/video/ivtv/ivtv-driver.c @@ -688,7 +688,7 @@ static int __devinit ivtv_init_struct1(struct ivtv *itv) spin_lock_init(&itv->lock); spin_lock_init(&itv->dma_reg_lock); - itv->irq_work_queues = create_workqueue(itv->name); + itv->irq_work_queues = create_singlethread_workqueue(itv->name); if (itv->irq_work_queues == NULL) { IVTV_ERR("Could not create ivtv workqueue\n"); return -1; diff --git a/drivers/media/video/ivtv/ivtv-driver.h b/drivers/media/video/ivtv/ivtv-driver.h index ab287b48fc..2ceb522763 100644 --- a/drivers/media/video/ivtv/ivtv-driver.h +++ b/drivers/media/video/ivtv/ivtv-driver.h @@ -251,6 +251,7 @@ struct ivtv_mailbox_data { #define IVTV_F_I_DEC_PAUSED 20 /* the decoder is paused */ #define IVTV_F_I_INITED 21 /* set after first open */ #define IVTV_F_I_FAILED 22 /* set if first open failed */ +#define IVTV_F_I_WORK_INITED 23 /* worker thread was initialized */ /* Event notifications */ #define IVTV_F_I_EV_DEC_STOPPED 28 /* decoder stopped event */ diff --git a/drivers/media/video/ivtv/ivtv-irq.c b/drivers/media/video/ivtv/ivtv-irq.c index fba150a6cd..34f3ab8278 100644 --- a/drivers/media/video/ivtv/ivtv-irq.c +++ b/drivers/media/video/ivtv/ivtv-irq.c @@ -76,6 +76,13 @@ void ivtv_irq_work_handler(struct work_struct *work) DEFINE_WAIT(wait); + if (test_and_clear_bit(IVTV_F_I_WORK_INITED, &itv->i_flags)) { + struct sched_param param = { .sched_priority = 99 }; + + /* This thread must use the FIFO scheduler as it + is realtime sensitive. */ + sched_setscheduler(current, SCHED_FIFO, ¶m); + } if (test_and_clear_bit(IVTV_F_I_WORK_HANDLER_PIO, &itv->i_flags)) ivtv_pio_work_handler(itv); @@ -678,34 +685,14 @@ static void ivtv_irq_enc_start_cap(struct ivtv *itv) static void ivtv_irq_enc_vbi_cap(struct ivtv *itv) { - struct ivtv_stream *s_mpg = &itv->streams[IVTV_ENC_STREAM_TYPE_MPG]; u32 data[CX2341X_MBOX_MAX_DATA]; struct ivtv_stream *s; IVTV_DEBUG_HI_IRQ("ENC START VBI CAP\n"); s = &itv->streams[IVTV_ENC_STREAM_TYPE_VBI]; - /* If more than two VBI buffers are pending, then - clear the old ones and start with this new one. - This can happen during transition stages when MPEG capturing is - started, but the first interrupts haven't arrived yet. During - that period VBI requests can accumulate without being able to - DMA the data. Since at most four VBI DMA buffers are available, - we just drop the old requests when there are already three - requests queued. */ - if (s->sg_pending_size > 2) { - struct ivtv_buffer *buf; - list_for_each_entry(buf, &s->q_predma.list, list) - ivtv_buf_sync_for_cpu(s, buf); - ivtv_queue_move(s, &s->q_predma, NULL, &s->q_free, 0); - s->sg_pending_size = 0; - } - /* if we can append the data, and the MPEG stream isn't capturing, - then start a DMA request for just the VBI data. */ - if (!stream_enc_dma_append(s, data) && - !test_bit(IVTV_F_S_STREAMING, &s_mpg->s_flags)) { + if (!stream_enc_dma_append(s, data)) set_bit(ivtv_use_pio(s) ? IVTV_F_S_PIO_PENDING : IVTV_F_S_DMA_PENDING, &s->s_flags); - } } static void ivtv_irq_dec_vbi_reinsert(struct ivtv *itv) diff --git a/drivers/media/video/ivtv/ivtv-queue.h b/drivers/media/video/ivtv/ivtv-queue.h index 7cfc0c9ab0..476556afd3 100644 --- a/drivers/media/video/ivtv/ivtv-queue.h +++ b/drivers/media/video/ivtv/ivtv-queue.h @@ -23,7 +23,7 @@ #define IVTV_QUEUE_H #define IVTV_DMA_UNMAPPED ((u32) -1) -#define SLICED_VBI_PIO 1 +#define SLICED_VBI_PIO 0 /* ivtv_buffer utility functions */ diff --git a/drivers/media/video/ivtv/ivtv-streams.c b/drivers/media/video/ivtv/ivtv-streams.c index 54d2023b26..730e85d86f 100644 --- a/drivers/media/video/ivtv/ivtv-streams.c +++ b/drivers/media/video/ivtv/ivtv-streams.c @@ -363,7 +363,7 @@ static void ivtv_vbi_setup(struct ivtv *itv) /* Every X number of frames a VBI interrupt arrives (frames as in 25 or 30 fps) */ data[1] = 1; /* The VBI frames are stored in a ringbuffer with this size (with a VBI frame as unit) */ - data[2] = raw ? 4 : 8; + data[2] = raw ? 4 : 4 * (itv->vbi.raw_size / itv->vbi.enc_size); /* The start/stop codes determine which VBI lines end up in the raw VBI data area. The codes are from table 24 in the saa7115 datasheet. Each raw/sliced/video line is framed with codes FF0000XX where XX is the SAV/EAV (Start/End of Active Video) diff --git a/drivers/media/video/ivtv/ivtv-vbi.c b/drivers/media/video/ivtv/ivtv-vbi.c index 71798f0da2..1ce9deb110 100644 --- a/drivers/media/video/ivtv/ivtv-vbi.c +++ b/drivers/media/video/ivtv/ivtv-vbi.c @@ -293,6 +293,7 @@ static u32 compress_sliced_buf(struct ivtv *itv, u32 line, u8 *buf, u32 size, u8 u32 line_size = itv->vbi.sliced_decoder_line_size; struct v4l2_decode_vbi_line vbi; int i; + unsigned lines = 0; /* find the first valid line */ for (i = 0; i < size; i++, buf++) { @@ -313,7 +314,8 @@ static u32 compress_sliced_buf(struct ivtv *itv, u32 line, u8 *buf, u32 size, u8 } vbi.p = p + 4; itv->video_dec_func(itv, VIDIOC_INT_DECODE_VBI_LINE, &vbi); - if (vbi.type) { + if (vbi.type && !(lines & (1 << vbi.line))) { + lines |= 1 << vbi.line; itv->vbi.sliced_data[line].id = vbi.type; itv->vbi.sliced_data[line].field = vbi.is_second_field; itv->vbi.sliced_data[line].line = vbi.line;