Tristan Matthews | 0a329cc | 2013-07-17 13:20:14 -0400 | [diff] [blame] | 1 | /* Copyright (C) 2002 Jean-Marc Valin |
| 2 | File: speex_header.c |
| 3 | Describes the Speex header |
| 4 | |
| 5 | Redistribution and use in source and binary forms, with or without |
| 6 | modification, are permitted provided that the following conditions |
| 7 | are met: |
| 8 | |
| 9 | - Redistributions of source code must retain the above copyright |
| 10 | notice, this list of conditions and the following disclaimer. |
| 11 | |
| 12 | - Redistributions in binary form must reproduce the above copyright |
| 13 | notice, this list of conditions and the following disclaimer in the |
| 14 | documentation and/or other materials provided with the distribution. |
| 15 | |
| 16 | - Neither the name of the Xiph.org Foundation nor the names of its |
| 17 | contributors may be used to endorse or promote products derived from |
| 18 | this software without specific prior written permission. |
| 19 | |
| 20 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 21 | ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 22 | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 23 | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR |
| 24 | CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 25 | EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 26 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 27 | PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 28 | LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 29 | NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 30 | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 31 | |
| 32 | */ |
| 33 | |
| 34 | #ifdef HAVE_CONFIG_H |
| 35 | #include "config.h" |
| 36 | #endif |
| 37 | |
| 38 | #include "arch.h" |
| 39 | #include <speex/speex_header.h> |
| 40 | #include <speex/speex.h> |
| 41 | #include "os_support.h" |
| 42 | |
| 43 | #ifndef NULL |
| 44 | #define NULL 0 |
| 45 | #endif |
| 46 | |
| 47 | /** Convert little endian */ |
| 48 | static inline spx_int32_t le_int(spx_int32_t i) |
| 49 | { |
| 50 | #if !defined(__LITTLE_ENDIAN__) && ( defined(WORDS_BIGENDIAN) || defined(__BIG_ENDIAN__) ) |
| 51 | spx_uint32_t ui, ret; |
| 52 | ui = i; |
| 53 | ret = ui>>24; |
| 54 | ret |= (ui>>8)&0x0000ff00; |
| 55 | ret |= (ui<<8)&0x00ff0000; |
| 56 | ret |= (ui<<24); |
| 57 | return ret; |
| 58 | #else |
| 59 | return i; |
| 60 | #endif |
| 61 | } |
| 62 | |
| 63 | #define ENDIAN_SWITCH(x) {x=le_int(x);} |
| 64 | |
| 65 | |
| 66 | /* |
| 67 | typedef struct SpeexHeader { |
| 68 | char speex_string[8]; |
| 69 | char speex_version[SPEEX_HEADER_VERSION_LENGTH]; |
| 70 | int speex_version_id; |
| 71 | int header_size; |
| 72 | int rate; |
| 73 | int mode; |
| 74 | int mode_bitstream_version; |
| 75 | int nb_channels; |
| 76 | int bitrate; |
| 77 | int frame_size; |
| 78 | int vbr; |
| 79 | int frames_per_packet; |
| 80 | int extra_headers; |
| 81 | int reserved1; |
| 82 | int reserved2; |
| 83 | } SpeexHeader; |
| 84 | */ |
| 85 | |
| 86 | EXPORT void speex_init_header(SpeexHeader *header, int rate, int nb_channels, const SpeexMode *m) |
| 87 | { |
| 88 | int i; |
| 89 | const char *h="Speex "; |
| 90 | /* |
| 91 | strncpy(header->speex_string, "Speex ", 8); |
| 92 | strncpy(header->speex_version, SPEEX_VERSION, SPEEX_HEADER_VERSION_LENGTH-1); |
| 93 | header->speex_version[SPEEX_HEADER_VERSION_LENGTH-1]=0; |
| 94 | */ |
| 95 | for (i=0;i<8;i++) |
| 96 | header->speex_string[i]=h[i]; |
| 97 | for (i=0;i<SPEEX_HEADER_VERSION_LENGTH-1 && SPEEX_VERSION[i];i++) |
| 98 | header->speex_version[i]=SPEEX_VERSION[i]; |
| 99 | for (;i<SPEEX_HEADER_VERSION_LENGTH;i++) |
| 100 | header->speex_version[i]=0; |
| 101 | |
| 102 | header->speex_version_id = 1; |
| 103 | header->header_size = sizeof(SpeexHeader); |
| 104 | |
| 105 | header->rate = rate; |
| 106 | header->mode = m->modeID; |
| 107 | header->mode_bitstream_version = m->bitstream_version; |
| 108 | if (m->modeID<0) |
| 109 | speex_warning("This mode is meant to be used alone"); |
| 110 | header->nb_channels = nb_channels; |
| 111 | header->bitrate = -1; |
| 112 | speex_mode_query(m, SPEEX_MODE_FRAME_SIZE, &header->frame_size); |
| 113 | header->vbr = 0; |
| 114 | |
| 115 | header->frames_per_packet = 0; |
| 116 | header->extra_headers = 0; |
| 117 | header->reserved1 = 0; |
| 118 | header->reserved2 = 0; |
| 119 | } |
| 120 | |
| 121 | EXPORT char *speex_header_to_packet(SpeexHeader *header, int *size) |
| 122 | { |
| 123 | SpeexHeader *le_header; |
| 124 | le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader)); |
| 125 | |
| 126 | SPEEX_COPY(le_header, header, 1); |
| 127 | |
| 128 | /*Make sure everything is now little-endian*/ |
| 129 | ENDIAN_SWITCH(le_header->speex_version_id); |
| 130 | ENDIAN_SWITCH(le_header->header_size); |
| 131 | ENDIAN_SWITCH(le_header->rate); |
| 132 | ENDIAN_SWITCH(le_header->mode); |
| 133 | ENDIAN_SWITCH(le_header->mode_bitstream_version); |
| 134 | ENDIAN_SWITCH(le_header->nb_channels); |
| 135 | ENDIAN_SWITCH(le_header->bitrate); |
| 136 | ENDIAN_SWITCH(le_header->frame_size); |
| 137 | ENDIAN_SWITCH(le_header->vbr); |
| 138 | ENDIAN_SWITCH(le_header->frames_per_packet); |
| 139 | ENDIAN_SWITCH(le_header->extra_headers); |
| 140 | |
| 141 | *size = sizeof(SpeexHeader); |
| 142 | return (char *)le_header; |
| 143 | } |
| 144 | |
| 145 | EXPORT SpeexHeader *speex_packet_to_header(char *packet, int size) |
| 146 | { |
| 147 | int i; |
| 148 | SpeexHeader *le_header; |
| 149 | const char *h = "Speex "; |
| 150 | for (i=0;i<8;i++) |
| 151 | if (packet[i]!=h[i]) |
| 152 | { |
| 153 | speex_notify("This doesn't look like a Speex file"); |
| 154 | return NULL; |
| 155 | } |
| 156 | |
| 157 | /*FIXME: Do we allow larger headers?*/ |
| 158 | if (size < (int)sizeof(SpeexHeader)) |
| 159 | { |
| 160 | speex_notify("Speex header too small"); |
| 161 | return NULL; |
| 162 | } |
| 163 | |
| 164 | le_header = (SpeexHeader*)speex_alloc(sizeof(SpeexHeader)); |
| 165 | |
| 166 | SPEEX_COPY(le_header, (SpeexHeader*)packet, 1); |
| 167 | |
| 168 | /*Make sure everything is converted correctly from little-endian*/ |
| 169 | ENDIAN_SWITCH(le_header->speex_version_id); |
| 170 | ENDIAN_SWITCH(le_header->header_size); |
| 171 | ENDIAN_SWITCH(le_header->rate); |
| 172 | ENDIAN_SWITCH(le_header->mode); |
| 173 | ENDIAN_SWITCH(le_header->mode_bitstream_version); |
| 174 | ENDIAN_SWITCH(le_header->nb_channels); |
| 175 | ENDIAN_SWITCH(le_header->bitrate); |
| 176 | ENDIAN_SWITCH(le_header->frame_size); |
| 177 | ENDIAN_SWITCH(le_header->vbr); |
| 178 | ENDIAN_SWITCH(le_header->frames_per_packet); |
| 179 | ENDIAN_SWITCH(le_header->extra_headers); |
| 180 | |
| 181 | if (le_header->mode >= SPEEX_NB_MODES || le_header->mode < 0) |
| 182 | { |
| 183 | speex_notify("Invalid mode specified in Speex header"); |
| 184 | speex_free (le_header); |
| 185 | return NULL; |
| 186 | } |
| 187 | |
| 188 | if (le_header->nb_channels>2) |
| 189 | le_header->nb_channels = 2; |
| 190 | if (le_header->nb_channels<1) |
| 191 | le_header->nb_channels = 1; |
| 192 | |
| 193 | return le_header; |
| 194 | |
| 195 | } |
| 196 | |
| 197 | EXPORT void speex_header_free(void *ptr) |
| 198 | { |
| 199 | speex_free(ptr); |
| 200 | } |