X-Git-Url: http://git.tuebingen.mpg.de/?p=paraslash.git;a=blobdiff_plain;f=oss_write.c;h=d4b765857a852013bd3145e1a042589957d3f2aa;hp=f075ce502900e03e3fb743229e9f6ca7c735725e;hb=e0545fd978a9583f9583b9bb35e5c25cb78c78f4;hpb=26a0b7e457d1dd7e0e40d866d28de00c5d1cfa54 diff --git a/oss_write.c b/oss_write.c index f075ce50..d4b76585 100644 --- a/oss_write.c +++ b/oss_write.c @@ -1,26 +1,20 @@ -/* - * Copyright (C) 2009-2012 Andre Noll - * - * Licensed under the GPL v2. For licencing details see COPYING. - */ +/* Copyright (C) 2009 Andre Noll , see file COPYING. */ /** \file oss_write.c Paraslash's oss output plugin. */ #include #include -#include #include +#include +#include "write_cmd.lsg.h" #include "para.h" #include "fd.h" #include "string.h" #include "list.h" #include "sched.h" -#include "ggo.h" #include "buffer_tree.h" #include "write.h" -#include "write_common.h" -#include "oss_write.cmdline.h" #include "error.h" /** Data specific to the oss writer. */ @@ -31,6 +25,29 @@ struct private_oss_write_data { int bytes_per_frame; }; +/* + * We keep one bit of static storage to make sure only one instance of the oss + * writer is running at any given time. + */ +static bool sound_device_busy; + +static bool sound_device_is_busy(void) +{ + return sound_device_busy; +} + +static void set_sound_device_busy(void) +{ + assert(!sound_device_busy); + sound_device_busy = true; +} + +static void set_sound_device_idle(void) +{ + assert(sound_device_busy); + sound_device_busy = false; +} + static int get_oss_format(enum sample_format sf) { switch (sf) { @@ -44,13 +61,13 @@ static int get_oss_format(enum sample_format sf) } } -static void oss_pre_select(struct sched *s, struct task *t) +static void oss_pre_select(struct sched *s, void *context) { - struct writer_node *wn = container_of(t, struct writer_node, task); + struct writer_node *wn = context; struct private_oss_write_data *powd = wn->private_data; int ret = btr_node_status(wn->btrn, wn->min_iqs, BTR_NT_LEAF); - if (ret == 0) + if (ret == 0 || (sound_device_is_busy() && !powd)) return; if (ret < 0 || !powd) return sched_min_delay(s); @@ -65,6 +82,7 @@ static void oss_close(struct writer_node *wn) return; close(powd->fd); free(powd); + set_sound_device_idle(); } /* @@ -83,11 +101,11 @@ static int oss_init(struct writer_node *wn, unsigned sample_rate, { int ret, format; unsigned ch, rate; - struct oss_write_args_info *conf = wn->conf; struct private_oss_write_data *powd = para_calloc(sizeof(*powd)); + const char *dev = WRITE_CMD_OPT_STRING_VAL(OSS, DEVICE, wn->lpr); - PARA_INFO_LOG("opening %s\n", conf->device_arg); - ret = para_open(conf->device_arg, O_WRONLY, 0); + PARA_INFO_LOG("opening %s\n", dev); + ret = para_open(dev, O_WRONLY, 0); if (ret < 0) goto err_free; powd->fd = ret; @@ -123,7 +141,7 @@ static int oss_init(struct writer_node *wn, unsigned sample_rate, * Set sampling rate * * If we request a higher sampling rate than is supported by the - * device, the the highest possible speed is automatically used. The + * device, the highest possible speed is automatically used. The * value actually used is returned as the new value of the argument. */ rate = sample_rate; @@ -142,7 +160,7 @@ static int oss_init(struct writer_node *wn, unsigned sample_rate, ret = -E_BAD_SAMPLERATE; if (100 * max > 110 * min) /* more than 10% deviation */ goto err; - PARA_NOTICE_LOG("using %dHz rather than %dHz\n", rate, + PARA_NOTICE_LOG("using %uHz rather than %uHz\n", rate, sample_rate); } wn->min_iqs = powd->bytes_per_frame; @@ -152,32 +170,39 @@ err: close(powd->fd); err_free: free(powd); + PARA_ERROR_LOG("failed to init %s: %s\n", dev, para_strerror(-ret)); return ret; } -static void oss_post_select(__a_unused struct sched *s, - struct task *t) +static int oss_post_select(__a_unused struct sched *s, void *context) { - struct writer_node *wn = container_of(t, struct writer_node, task); + struct writer_node *wn = context; struct private_oss_write_data *powd = wn->private_data; struct btr_node *btrn = wn->btrn; size_t frames, bytes; - int ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF); + int ret; char *data; + audio_buf_info abi; + ret = task_get_notification(wn->task); if (ret < 0) goto out; - if (ret == 0) - return; + ret = btr_node_status(btrn, wn->min_iqs, BTR_NT_LEAF); + if (ret <= 0) + goto out; if (!powd) { int32_t rate, ch, format; + + if (sound_device_is_busy()) + return 0; get_btr_sample_rate(btrn, &rate); get_btr_channels(btrn, &ch); get_btr_sample_format(btrn, &format); ret = oss_init(wn, rate, ch, format); if (ret < 0) goto out; - return; + set_sound_device_busy(); + return 0; } btr_merge(btrn, wn->min_iqs); bytes = btr_next_buffer(btrn, &data); @@ -189,52 +214,28 @@ static void oss_post_select(__a_unused struct sched *s, ret = 0; if (!FD_ISSET(powd->fd, &s->wfds)) goto out; + /* get maximal number of bytes that can be written */ + ret = ioctl(powd->fd, SNDCTL_DSP_GETOSPACE, &abi); + if (ret >= 0) { + size_t max_frames = abi.bytes / powd->bytes_per_frame; + if (max_frames == 0) + goto out; + /* cap number of frames to avoid sound artefacts */ + frames = PARA_MIN(frames, max_frames); + } ret = xwrite(powd->fd, data, frames * powd->bytes_per_frame); if (ret < 0) goto out; btr_consume(btrn, ret); ret = 0; out: - t->error = ret; if (ret < 0) - btr_remove_node(btrn); -} - -__malloc static void *oss_parse_config_or_die(const char *options) -{ - struct oss_write_args_info *conf = para_calloc(sizeof(*conf)); - - /* exits on errors */ - oss_cmdline_parser_string(options, conf, "oss_write"); - return conf; -} - -static void oss_free_config(void *conf) -{ - oss_cmdline_parser_free(conf); + btr_remove_node(&wn->btrn); + return ret; } -/** - * The init function of the oss writer. - * - * \param w Pointer to the writer to initialize. - * - * \sa struct writer. - */ -void oss_write_init(struct writer *w) -{ - struct oss_write_args_info dummy; - - oss_cmdline_parser_init(&dummy); - w->close = oss_close; - w->pre_select = oss_pre_select; - w->post_select = oss_post_select; - w->parse_config_or_die = oss_parse_config_or_die; - w->free_config = oss_free_config; - w->shutdown = NULL; - w->help = (struct ggo_help) { - .short_help = oss_write_args_info_help, - .detailed_help = oss_write_args_info_detailed_help - }; - oss_cmdline_parser_free(&dummy); -} +const struct writer lsg_write_cmd_com_oss_user_data = { + .pre_select = oss_pre_select, + .post_select = oss_post_select, + .close = oss_close, +};