afh_recv.c

   1 /*
   2  * Copyright (C) 2011 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file afh_recv.c Receiver for streaming local files. */
   8
   9 #include <regex.h>
  10 #include <sys/types.h>
  11 #include <lopsub.h>
  12
  13 #include "recv_cmd.lsg.h"
  14 #include "para.h"
  15 #include "error.h"
  16 #include "list.h"
  17 #include "sched.h"
  18 #include "buffer_tree.h"
  19 #include "recv.h"
  20 #include "string.h"
  21 #include "fd.h"
  22 #include "afh.h"
  23
  24 struct private_afh_recv_data {
  25         int fd;
  26         void *map;
  27         size_t map_size;
  28         struct afh_info afhi;
  29         int audio_format_num;
  30         long unsigned first_chunk;
  31         long unsigned last_chunk;
  32         struct timeval stream_start;
  33         uint32_t current_chunk;
  34         void *afh_context;
  35 };
  36
  37 static int afh_execute(struct btr_node *btrn, const char *cmd, char **result)
  38 {
  39         struct receiver_node *rn = btr_context(btrn);
  40         struct private_afh_recv_data *pard = rn->private_data;
  41
  42         *result = NULL;
  43         if (!strcmp(cmd, "seconds_total")) {
  44                 *result = make_message("%" PRIu32, pard->afhi.seconds_total);
  45                 return 1;
  46         }
  47         if (!strcmp(cmd, "chunks_total")) {
  48                 *result = make_message("%" PRIu32, pard->afhi.chunks_total);
  49                 return 1;
  50         }
  51         if (!strcmp(cmd, "afhi")) {
  52                 afh_get_afhi_txt(pard->audio_format_num, &pard->afhi, result);
  53                 return 1;
  54         }
  55         if (!strncmp(cmd, "repos", 5)) {
  56                 int32_t x;
  57                 int ret = para_atoi32(cmd + 5, &x);
  58                 if (ret < 0)
  59                         return ret;
  60                 if (x >= pard->afhi.chunks_total)
  61                         return -ERRNO_TO_PARA_ERROR(EINVAL);
  62                 pard->first_chunk = afh_get_start_chunk(x, &pard->afhi,
  63                         pard->audio_format_num);
  64                 pard->current_chunk = pard->first_chunk;
  65                 return 1;
  66         }
  67         return -E_BTR_NAVAIL;
  68 }
  69
  70 static int afh_recv_open(struct receiver_node *rn)
  71 {
  72         struct lls_parse_result *lpr = rn->lpr;
  73         struct private_afh_recv_data *pard;
  74         struct afh_info *afhi;
  75         const char *fn = RECV_CMD_OPT_STRING_VAL(AFH, FILENAME, lpr);
  76         int32_t bc = RECV_CMD_OPT_INT32_VAL(AFH, BEGIN_CHUNK, lpr);
  77         const struct lls_opt_result *r_e = RECV_CMD_OPT_RESULT(AFH, END_CHUNK, lpr);
  78         int ret;
  79
  80         if (!fn || *fn == '\0')
  81                 return -E_AFH_RECV_BAD_FILENAME;
  82         rn->private_data = pard = para_calloc(sizeof(*pard));
  83         afhi = &pard->afhi;
  84         ret = mmap_full_file(fn, O_RDONLY, &pard->map,
  85                 &pard->map_size, &pard->fd);
  86         if (ret < 0)
  87                 goto out;
  88         ret = compute_afhi(fn, pard->map, pard->map_size,
  89                 pard->fd, afhi);
  90         if (ret < 0)
  91                 goto out_unmap;
  92         pard->audio_format_num = ret;
  93         ret = -ERRNO_TO_PARA_ERROR(EINVAL);
  94         if (afhi->chunks_total == 0)
  95                 goto out_clear_afhi;
  96         if (PARA_ABS(bc) >= afhi->chunks_total)
  97                 goto out_clear_afhi;
  98         if (bc >= 0)
  99                 pard->first_chunk = afh_get_start_chunk(bc, &pard->afhi,
 100                         pard->audio_format_num);
 101         else
 102                 pard->first_chunk = afh_get_start_chunk(afhi->chunks_total + bc,
 103                         &pard->afhi, pard->audio_format_num);
 104         if (lls_opt_given(r_e)) {
 105                 int32_t ec = lls_int32_val(0, r_e);
 106                 ret = -ERRNO_TO_PARA_ERROR(EINVAL);
 107                 if (PARA_ABS(ec) > afhi->chunks_total)
 108                         goto out_clear_afhi;
 109                 if (ec >= 0)
 110                         pard->last_chunk = ec;
 111                 else
 112                         pard->last_chunk = afhi->chunks_total + ec;
 113         } else
 114                 pard->last_chunk = afhi->chunks_total - 1;
 115         ret = -ERRNO_TO_PARA_ERROR(EINVAL);
 116         if (pard->first_chunk >= pard->last_chunk)
 117                 goto out_clear_afhi;
 118         pard->current_chunk = pard->first_chunk;
 119         return pard->audio_format_num;
 120 out_clear_afhi:
 121         clear_afhi(afhi);
 122 out_unmap:
 123         para_munmap(pard->map, pard->map_size);
 124         close(pard->fd);
 125 out:
 126         freep(&rn->private_data);
 127         return ret;
 128 }
 129
 130 static void afh_recv_close(struct receiver_node *rn)
 131 {
 132         struct private_afh_recv_data *pard;
 133
 134         if (!rn || !rn->private_data)
 135                 return;
 136         pard = rn->private_data;
 137         clear_afhi(&pard->afhi);
 138         para_munmap(pard->map, pard->map_size);
 139         close(pard->fd);
 140         afh_close(pard->afh_context, pard->audio_format_num);
 141         freep(&rn->private_data);
 142 }
 143
 144 static void afh_recv_pre_select(struct sched *s, void *context)
 145 {
 146         struct receiver_node *rn = context;
 147         struct private_afh_recv_data *pard = rn->private_data;
 148         struct afh_info *afhi = &pard->afhi;
 149         struct lls_parse_result *lpr = rn->lpr;
 150         struct timeval chunk_time;
 151         int state = generic_recv_pre_select(s, rn);
 152         unsigned j_given = RECV_CMD_OPT_GIVEN(AFH, JUST_IN_TIME, lpr);
 153
 154         if (state <= 0)
 155                 return;
 156         if (!j_given) {
 157                 sched_min_delay(s);
 158                 return;
 159         }
 160         compute_chunk_time(pard->current_chunk - pard->first_chunk,
 161                 &afhi->chunk_tv, &pard->stream_start, &chunk_time);
 162         sched_request_barrier_or_min_delay(&chunk_time, s);
 163 }
 164
 165 static int afh_recv_post_select(__a_unused struct sched *s, void *context)
 166 {
 167         struct receiver_node *rn = context;
 168         struct lls_parse_result *lpr = rn->lpr;
 169         struct private_afh_recv_data *pard = rn->private_data;
 170         struct btr_node *btrn = rn->btrn;
 171         struct afh_info *afhi = &pard->afhi;
 172         int ret;
 173         char *buf;
 174         const char *start;
 175         size_t size;
 176         struct timeval chunk_time;
 177         unsigned j_given = RECV_CMD_OPT_GIVEN(AFH, JUST_IN_TIME, lpr);
 178         unsigned H_given = RECV_CMD_OPT_GIVEN(AFH, NO_HEADER, lpr);
 179
 180         ret = btr_node_status(btrn, 0, BTR_NT_ROOT);
 181         if (ret <= 0)
 182                 goto out;
 183         if (pard->first_chunk > 0 && !H_given) {
 184                 char *header;
 185                 afh_get_header(afhi, pard->audio_format_num, pard->map,
 186                         pard->map_size, &header, &size);
 187                 if (size > 0) {
 188                         PARA_INFO_LOG("writing header (%zu bytes)\n", size);
 189                         buf = para_malloc(size);
 190                         memcpy(buf, header, size);
 191                         btr_add_output(buf, size, btrn);
 192                         afh_free_header(header, pard->audio_format_num);
 193                 }
 194         }
 195         if (!j_given) {
 196                 long unsigned n;
 197                 for (n = pard->first_chunk; n < pard->last_chunk; n++) {
 198                         ret = afh_get_chunk(n, afhi, pard->audio_format_num,
 199                                 pard->map, pard->map_size, &start, &size,
 200                                 &pard->afh_context);
 201                         if (ret < 0)
 202                                 goto out;
 203                         PARA_INFO_LOG("adding %zu bytes\n", size);
 204                         btr_add_output_dont_free(start, size, btrn);
 205                 }
 206                 ret = -E_RECV_EOF;
 207                 goto out;
 208         }
 209         if (pard->current_chunk == pard->first_chunk)
 210                 pard->stream_start = *now;
 211         else {
 212                 compute_chunk_time(pard->current_chunk - pard->first_chunk,
 213                         &afhi->chunk_tv, &pard->stream_start, &chunk_time);
 214                 ret = tv_diff(&chunk_time, now, NULL);
 215                 if (ret > 0)
 216                         goto out;
 217         }
 218         ret = afh_get_chunk(pard->current_chunk, afhi,
 219                 pard->audio_format_num, pard->map,
 220                 pard->map_size, &start, &size,
 221                 &pard->afh_context);
 222         if (ret < 0)
 223                 goto out;
 224         PARA_DEBUG_LOG("adding chunk %u\n", pard->current_chunk);
 225         btr_add_output_dont_free(start, size, btrn);
 226         if (pard->current_chunk >= pard->last_chunk) {
 227                 ret = -E_RECV_EOF;
 228                 goto out;
 229         }
 230         pard->current_chunk++;
 231         ret = 1;
 232 out:
 233         if (ret < 0) {
 234                 btr_remove_node(&rn->btrn);
 235                 pard->current_chunk = pard->first_chunk;
 236         }
 237         return ret;
 238 }
 239
 240 /** See \ref recv_init(). */
 241 const struct receiver lsg_recv_cmd_com_afh_user_data = {
 242         .init = afh_init,
 243         .open = afh_recv_open,
 244         .close = afh_recv_close,
 245         .pre_select = afh_recv_pre_select,
 246         .post_select = afh_recv_post_select,
 247         .execute = afh_execute,
 248 };