Merge branch 'refs/heads/t/markdown'
[paraslash.git] / amp_filter.c
index e180db4..5193d7c 100644 (file)
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2009 Andre Noll <maan@tuebingen.mpg.de>
  *
  * Licensed under the GPL v2. For licencing details see COPYING.
  */
 #include "list.h"
 #include "sched.h"
 #include "ggo.h"
+#include "buffer_tree.h"
 #include "filter.h"
 #include "string.h"
 #include "error.h"
 
-/** The size of the output data buffer. */
-#define AMP_CHUNK_SIZE 40960
-
 extern char *stat_item_values[NUM_STAT_ITEMS];
 
 /** Data specific to the amplify filter. */
 struct private_amp_data {
-       /** Points to the configuration data for this instance of this filter. */
-       struct amp_filter_args_info *conf;
        /** Amplification factor. */
        unsigned amp;
 };
 
-static ssize_t amp_convert(char *inbuf, size_t inbuf_len, struct filter_node *fn)
-{
-       size_t i, length = PARA_MIN((inbuf_len / 2),
-               (fn->bufsize - fn->loaded) / 2);
-       struct private_amp_data *pad = fn->private_data;
-       int16_t *ip = (int16_t *)inbuf, *op = (int16_t *)(fn->buf + fn->loaded);
-       int factor = 64 + pad->amp;
-
-       if (!length)
-               return 0;
-
-       if (pad->amp == 0) {
-               memcpy(op, ip, length * 2);
-               goto out;
-       }
-       for (i = 0; i < length; i++) {
-               int x = (ip[i] * factor) >> 6;
-
-               op[i] = x;
-               if (op[i] != x)
-                       op[i] = (x >= 32768)? 32767 : -32768;
-       }
-out:
-       fn->loaded += length * 2;
-       return length * 2;
-}
-
 static void amp_close(struct filter_node *fn)
 {
        free(fn->private_data);
-       free(fn->buf);
 }
 
 static int amp_parse_config(int argc, char **argv, void **config)
 {
-       struct amp_filter_args_info *amp_conf = para_calloc(sizeof(*amp_conf));
-       int ret = -E_AMP_SYNTAX;
+       struct amp_filter_args_info *conf = para_calloc(sizeof(*conf));
+       int ret;
 
-       if (amp_cmdline_parser(argc, argv, amp_conf))
-               goto err;
+       amp_filter_cmdline_parser(argc, argv, conf);
        ret = -ERRNO_TO_PARA_ERROR(EINVAL);
-       if (amp_conf->amp_arg < 0)
+       if (conf->amp_arg < 0)
                goto err;
-       PARA_NOTICE_LOG("amplification: %u (scaling factor: %1.2f)\n",
-               amp_conf->amp_arg, amp_conf->amp_arg / 64.0 + 1.0);
-       *config = amp_conf;
+       *config = conf;
        return 1;
 err:
-       free(amp_conf);
+       free(conf);
        return ret;
 }
 
 static void amp_open(struct filter_node *fn)
 {
        struct private_amp_data *pad = para_calloc(sizeof(*pad));
+       struct amp_filter_args_info *conf = fn->conf;
 
-       pad->conf = fn->conf;
        fn->private_data = pad;
-       if (!pad->conf->amp_given && stat_item_values[SI_AMPLIFICATION])
+       fn->min_iqs = 2;
+       if (!conf->amp_given && stat_item_values[SI_AMPLIFICATION])
                sscanf(stat_item_values[SI_AMPLIFICATION], "%u", &pad->amp);
        else
-               pad->amp = pad->conf->amp_arg;
-       fn->bufsize = AMP_CHUNK_SIZE;
-       fn->buf = para_malloc(fn->bufsize);
+               pad->amp = conf->amp_arg;
+       PARA_INFO_LOG("amplification: %u (scaling factor: %1.2f)\n",
+               pad->amp, pad->amp / 64.0 + 1.0);
+}
+
+static int amp_post_select(__a_unused struct sched *s, void *context)
+{
+       struct filter_node *fn = context;
+       struct private_amp_data *pad = fn->private_data;
+       struct btr_node *btrn = fn->btrn;
+       int ret, factor = 64 + pad->amp;
+       size_t i, in_bytes, len;
+       int16_t *in, *out;
+       bool inplace = btr_inplace_ok(btrn);
+
+       if (pad->amp == 0) { /* no amplification */
+               btr_splice_out_node(&fn->btrn);
+               return -E_AMP_ZERO_AMP;
+       }
+next_buffer:
+       ret = btr_node_status(btrn, fn->min_iqs, BTR_NT_INTERNAL);
+       if (ret < 0)
+               goto err;
+       if (ret == 0)
+               return 0;
+       btr_merge(btrn, fn->min_iqs);
+       in_bytes = btr_next_buffer(btrn, (char **)&in);
+       len = in_bytes / 2;
+       if (len == 0) { /* eof and in_bytes == 1 */
+               ret = -E_AMP_EOF;
+               goto err;
+       }
+
+       if (inplace)
+               out = in;
+       else
+               out = para_malloc(len * 2);
+
+       for (i = 0; i < len; i++) {
+               int x = (in[i] * factor) >> 6;
+
+               out[i] = x;
+               if (out[i] != x) /* overflow, clip */
+                       out[i] = (x >= 0)? 32767 : -32768;
+       }
+
+       if (inplace)
+               btr_pushdown_one(btrn);
+       else {
+               btr_consume(btrn, len * 2);
+               btr_add_output((char *)out, len * 2, btrn);
+       }
+       goto next_buffer;
+err:
+       assert(ret < 0);
+       btr_remove_node(&fn->btrn);
+       return ret;
+}
+
+static void amp_free_config(void *conf)
+{
+       amp_filter_cmdline_parser_free(conf);
 }
 
 /**
@@ -105,13 +130,12 @@ void amp_filter_init(struct filter *f)
 {
        struct amp_filter_args_info dummy;
 
-       amp_cmdline_parser_init(&dummy);
+       amp_filter_cmdline_parser_init(&dummy);
        f->open = amp_open;
        f->close = amp_close;
-       f->convert = amp_convert;
+       f->pre_select = generic_filter_pre_select;
+       f->post_select = amp_post_select;
        f->parse_config = amp_parse_config;
-       f->help = (struct ggo_help) {
-               .short_help = amp_filter_args_info_help,
-               .detailed_help = amp_filter_args_info_detailed_help
-       };
+       f->free_config = amp_free_config;
+       f->help = (struct ggo_help)DEFINE_GGO_HELP(amp_filter);
 }