1 | //transcode.c: |
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2 | |
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3 | /* |
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4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2009 |
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5 | * |
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6 | * This file is part of libroardsp a part of RoarAudio, |
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7 | * a cross-platform sound system for both, home and professional use. |
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8 | * See README for details. |
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9 | * |
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10 | * This file is free software; you can redistribute it and/or modify |
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11 | * it under the terms of the GNU General Public License version 3 |
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12 | * as published by the Free Software Foundation. |
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13 | * |
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14 | * libroardsp is distributed in the hope that it will be useful, |
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | * GNU General Public License for more details. |
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18 | * |
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19 | * You should have received a copy of the GNU General Public License |
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20 | * along with this software; see the file COPYING. If not, write to |
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21 | * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. |
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22 | * |
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23 | */ |
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24 | |
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25 | #include "libroardsp.h" |
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26 | |
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27 | #define _FUNC(func) (state->entry->func) |
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28 | #define _CHECK_STATE() (!(state == NULL || state->entry == NULL)) |
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29 | #define _CHECK_FUNC(func) (_CHECK_STATE() && _FUNC(func) != NULL) |
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30 | #define _CHECK_BASIC(func) if ( !_CHECK_FUNC(func) ) return -1 |
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31 | #define _CHECK() if ( !_CHECK_STATE() ) return -1 |
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32 | |
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33 | static struct roar_xcoder_entry g_xcoders[] = { |
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34 | {ROAR_CODEC_ALAW, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_packet_size_any, |
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35 | NULL, NULL}, |
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36 | {ROAR_CODEC_MULAW, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_inituninit, roar_xcoder_dummy_packet_size_any, |
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37 | NULL, NULL}, |
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38 | {-1, NULL, NULL, NULL, NULL, NULL} |
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39 | }; |
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40 | |
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41 | int roar_xcoder_init(struct roar_xcoder * state, int encoder, struct roar_audio_info * info, struct roar_vio_calls * vio); |
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42 | int roar_xcoder_set_backend(struct roar_xcoder * state, struct roar_vio_calls * vio) { |
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43 | _CHECK(); |
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44 | |
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45 | if ( vio == NULL && state->backend != NULL ) |
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46 | return -1; |
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47 | |
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48 | state->backend = vio; |
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49 | |
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50 | return 0; |
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51 | } |
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52 | int roar_xcoder_packet_size(struct roar_xcoder * state, int samples) { |
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53 | _CHECK_BASIC(packet_size); |
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54 | |
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55 | state->packet_len = state->entry->packet_size(state, samples); |
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56 | |
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57 | if ( state->packet_len == 0 ) { |
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58 | if ( samples < 1 ) { |
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59 | return ROAR_RATE_DEFAULT/100; |
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60 | } else { |
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61 | return samples; |
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62 | } |
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63 | } |
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64 | |
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65 | return state->packet_len; |
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66 | } |
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67 | |
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68 | int roar_xcoder_close (struct roar_xcoder * state) { |
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69 | _CHECK_BASIC(uninit); |
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70 | |
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71 | |
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72 | if ( state->iobuffer != NULL ) { |
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73 | roar_xcoder_proc(state, NULL, 0); // try to flush |
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74 | roar_buffer_free(state->iobuffer); |
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75 | } |
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76 | |
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77 | return _FUNC(uninit)(state); |
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78 | } |
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79 | |
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80 | int roar_xcoder_proc_packet(struct roar_xcoder * state, void * buf, size_t len); |
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81 | int roar_xcoder_proc (struct roar_xcoder * state, void * buf, size_t len) { |
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82 | return -1; |
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83 | } |
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84 | |
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85 | int roar_bixcoder_init(struct roar_bixcoder * state, struct roar_audio_info * info, struct roar_vio_calls * vio); |
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86 | int roar_bixcoder_packet_size (struct roar_bixcoder * state, int samples); |
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87 | int roar_bixcoder_close (struct roar_bixcoder * state); |
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88 | int roar_bixcoder_read_packet (struct roar_bixcoder * state, void * buf, size_t len); |
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89 | int roar_bixcoder_read (struct roar_bixcoder * state, void * buf, size_t len); |
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90 | int roar_bixcoder_write_packet(struct roar_bixcoder * state, void * buf, size_t len); |
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91 | int roar_bixcoder_write (struct roar_bixcoder * state, void * buf, size_t len); |
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92 | |
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93 | // dummy functions used by some de/encoders: |
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94 | int roar_xcoder_dummy_inituninit(struct roar_xcoder * state) { |
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95 | return 0; |
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96 | } |
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97 | |
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98 | int roar_xcoder_dummy_packet_size_any(struct roar_xcoder * state, int samples) { |
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99 | // the case samples=-1/samples!=-1 based things are done in the general func |
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100 | return 0; |
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101 | } |
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102 | |
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103 | //ll |
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