360 строки
8.9 KiB
C
360 строки
8.9 KiB
C
/*
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* ALSA PCM device for the
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* ALSA interface to ivtv PCM capture streams
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*
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* Copyright (C) 2009,2012 Andy Walls <awalls@md.metrocast.net>
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* Copyright (C) 2009 Devin Heitmueller <dheitmueller@kernellabs.com>
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*
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* Portions of this work were sponsored by ONELAN Limited for the cx18 driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include "ivtv-driver.h"
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#include "ivtv-queue.h"
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#include "ivtv-streams.h"
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#include "ivtv-fileops.h"
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#include "ivtv-alsa.h"
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#include "ivtv-alsa-pcm.h"
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#include <linux/vmalloc.h>
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#include <sound/core.h>
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#include <sound/pcm.h>
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static unsigned int pcm_debug;
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module_param(pcm_debug, int, 0644);
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MODULE_PARM_DESC(pcm_debug, "enable debug messages for pcm");
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#define dprintk(fmt, arg...) \
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do { \
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if (pcm_debug) \
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pr_info("ivtv-alsa-pcm %s: " fmt, __func__, ##arg); \
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} while (0)
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static const struct snd_pcm_hardware snd_ivtv_hw_capture = {
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.info = SNDRV_PCM_INFO_BLOCK_TRANSFER |
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SNDRV_PCM_INFO_MMAP |
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SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_MMAP_VALID,
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.formats = SNDRV_PCM_FMTBIT_S16_LE,
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.rates = SNDRV_PCM_RATE_48000,
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.rate_min = 48000,
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.rate_max = 48000,
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.channels_min = 2,
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.channels_max = 2,
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.buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */
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.period_bytes_min = 64, /* 12544/2, */
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.period_bytes_max = 12544,
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.periods_min = 2,
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.periods_max = 98, /* 12544, */
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};
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static void ivtv_alsa_announce_pcm_data(struct snd_ivtv_card *itvsc,
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u8 *pcm_data,
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size_t num_bytes)
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{
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struct snd_pcm_substream *substream;
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struct snd_pcm_runtime *runtime;
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unsigned int oldptr;
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unsigned int stride;
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int period_elapsed = 0;
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int length;
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dprintk("ivtv alsa announce ptr=%p data=%p num_bytes=%zu\n", itvsc,
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pcm_data, num_bytes);
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substream = itvsc->capture_pcm_substream;
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if (substream == NULL) {
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dprintk("substream was NULL\n");
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return;
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}
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runtime = substream->runtime;
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if (runtime == NULL) {
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dprintk("runtime was NULL\n");
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return;
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}
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stride = runtime->frame_bits >> 3;
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if (stride == 0) {
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dprintk("stride is zero\n");
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return;
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}
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length = num_bytes / stride;
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if (length == 0) {
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dprintk("%s: length was zero\n", __func__);
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return;
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}
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if (runtime->dma_area == NULL) {
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dprintk("dma area was NULL - ignoring\n");
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return;
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}
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oldptr = itvsc->hwptr_done_capture;
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if (oldptr + length >= runtime->buffer_size) {
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unsigned int cnt =
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runtime->buffer_size - oldptr;
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memcpy(runtime->dma_area + oldptr * stride, pcm_data,
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cnt * stride);
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memcpy(runtime->dma_area, pcm_data + cnt * stride,
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length * stride - cnt * stride);
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} else {
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memcpy(runtime->dma_area + oldptr * stride, pcm_data,
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length * stride);
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}
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snd_pcm_stream_lock(substream);
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itvsc->hwptr_done_capture += length;
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if (itvsc->hwptr_done_capture >=
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runtime->buffer_size)
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itvsc->hwptr_done_capture -=
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runtime->buffer_size;
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itvsc->capture_transfer_done += length;
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if (itvsc->capture_transfer_done >=
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runtime->period_size) {
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itvsc->capture_transfer_done -=
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runtime->period_size;
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period_elapsed = 1;
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}
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snd_pcm_stream_unlock(substream);
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if (period_elapsed)
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snd_pcm_period_elapsed(substream);
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}
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static int snd_ivtv_pcm_capture_open(struct snd_pcm_substream *substream)
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{
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struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
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struct ivtv *itv = to_ivtv(v4l2_dev);
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struct ivtv_stream *s;
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struct ivtv_open_id item;
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int ret;
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/* Instruct the CX2341[56] to start sending packets */
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snd_ivtv_lock(itvsc);
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if (ivtv_init_on_first_open(itv)) {
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snd_ivtv_unlock(itvsc);
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return -ENXIO;
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}
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s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
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v4l2_fh_init(&item.fh, &s->vdev);
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item.itv = itv;
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item.type = s->type;
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/* See if the stream is available */
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if (ivtv_claim_stream(&item, item.type)) {
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/* No, it's already in use */
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v4l2_fh_exit(&item.fh);
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snd_ivtv_unlock(itvsc);
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return -EBUSY;
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}
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if (test_bit(IVTV_F_S_STREAMOFF, &s->s_flags) ||
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test_and_set_bit(IVTV_F_S_STREAMING, &s->s_flags)) {
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/* We're already streaming. No additional action required */
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snd_ivtv_unlock(itvsc);
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return 0;
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}
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runtime->hw = snd_ivtv_hw_capture;
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snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
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itvsc->capture_pcm_substream = substream;
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runtime->private_data = itv;
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itv->pcm_announce_callback = ivtv_alsa_announce_pcm_data;
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/* Not currently streaming, so start it up */
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set_bit(IVTV_F_S_STREAMING, &s->s_flags);
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ret = ivtv_start_v4l2_encode_stream(s);
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snd_ivtv_unlock(itvsc);
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return ret;
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}
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static int snd_ivtv_pcm_capture_close(struct snd_pcm_substream *substream)
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{
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struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
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struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
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struct ivtv *itv = to_ivtv(v4l2_dev);
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struct ivtv_stream *s;
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/* Instruct the ivtv to stop sending packets */
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snd_ivtv_lock(itvsc);
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s = &itv->streams[IVTV_ENC_STREAM_TYPE_PCM];
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ivtv_stop_v4l2_encode_stream(s, 0);
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clear_bit(IVTV_F_S_STREAMING, &s->s_flags);
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ivtv_release_stream(s);
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itv->pcm_announce_callback = NULL;
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snd_ivtv_unlock(itvsc);
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return 0;
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}
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static int snd_ivtv_pcm_ioctl(struct snd_pcm_substream *substream,
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unsigned int cmd, void *arg)
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{
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struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
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int ret;
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snd_ivtv_lock(itvsc);
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ret = snd_pcm_lib_ioctl(substream, cmd, arg);
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snd_ivtv_unlock(itvsc);
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return ret;
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}
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static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs,
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size_t size)
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{
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struct snd_pcm_runtime *runtime = subs->runtime;
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dprintk("Allocating vbuffer\n");
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if (runtime->dma_area) {
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if (runtime->dma_bytes > size)
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return 0;
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vfree(runtime->dma_area);
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}
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runtime->dma_area = vmalloc(size);
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if (!runtime->dma_area)
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return -ENOMEM;
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runtime->dma_bytes = size;
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return 0;
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}
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static int snd_ivtv_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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dprintk("%s called\n", __func__);
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return snd_pcm_alloc_vmalloc_buffer(substream,
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params_buffer_bytes(params));
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}
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static int snd_ivtv_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
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unsigned long flags;
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unsigned char *dma_area = NULL;
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spin_lock_irqsave(&itvsc->slock, flags);
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if (substream->runtime->dma_area) {
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dprintk("freeing pcm capture region\n");
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dma_area = substream->runtime->dma_area;
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substream->runtime->dma_area = NULL;
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}
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spin_unlock_irqrestore(&itvsc->slock, flags);
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vfree(dma_area);
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return 0;
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}
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static int snd_ivtv_pcm_prepare(struct snd_pcm_substream *substream)
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{
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struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
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itvsc->hwptr_done_capture = 0;
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itvsc->capture_transfer_done = 0;
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return 0;
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}
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static int snd_ivtv_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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return 0;
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}
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static
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snd_pcm_uframes_t snd_ivtv_pcm_pointer(struct snd_pcm_substream *substream)
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{
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unsigned long flags;
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snd_pcm_uframes_t hwptr_done;
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struct snd_ivtv_card *itvsc = snd_pcm_substream_chip(substream);
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spin_lock_irqsave(&itvsc->slock, flags);
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hwptr_done = itvsc->hwptr_done_capture;
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spin_unlock_irqrestore(&itvsc->slock, flags);
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return hwptr_done;
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}
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static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs,
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unsigned long offset)
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{
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void *pageptr = subs->runtime->dma_area + offset;
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return vmalloc_to_page(pageptr);
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}
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static const struct snd_pcm_ops snd_ivtv_pcm_capture_ops = {
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.open = snd_ivtv_pcm_capture_open,
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.close = snd_ivtv_pcm_capture_close,
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.ioctl = snd_ivtv_pcm_ioctl,
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.hw_params = snd_ivtv_pcm_hw_params,
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.hw_free = snd_ivtv_pcm_hw_free,
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.prepare = snd_ivtv_pcm_prepare,
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.trigger = snd_ivtv_pcm_trigger,
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.pointer = snd_ivtv_pcm_pointer,
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.page = snd_pcm_get_vmalloc_page,
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};
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int snd_ivtv_pcm_create(struct snd_ivtv_card *itvsc)
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{
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struct snd_pcm *sp;
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struct snd_card *sc = itvsc->sc;
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struct v4l2_device *v4l2_dev = itvsc->v4l2_dev;
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struct ivtv *itv = to_ivtv(v4l2_dev);
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int ret;
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ret = snd_pcm_new(sc, "CX2341[56] PCM",
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0, /* PCM device 0, the only one for this card */
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0, /* 0 playback substreams */
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1, /* 1 capture substream */
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&sp);
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if (ret) {
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IVTV_ALSA_ERR("%s: snd_ivtv_pcm_create() failed with err %d\n",
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__func__, ret);
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goto err_exit;
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}
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spin_lock_init(&itvsc->slock);
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snd_pcm_set_ops(sp, SNDRV_PCM_STREAM_CAPTURE,
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&snd_ivtv_pcm_capture_ops);
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sp->info_flags = 0;
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sp->private_data = itvsc;
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strlcpy(sp->name, itv->card_name, sizeof(sp->name));
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return 0;
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err_exit:
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return ret;
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}
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