diff options
Diffstat (limited to 'src')
-rw-r--r-- | src/framepack.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/src/framepack.c b/src/framepack.c new file mode 100644 index 00000000..ae1084a4 --- /dev/null +++ b/src/framepack.c @@ -0,0 +1,108 @@ +/* Copyright (c) 2010 Xiph.Org Foundation, Skype Limited + Written by Jean-Marc Valin and Koen Vos */ +/* + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + - Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + - Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + - Neither the name of the Xiph.org Foundation nor the names of its + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR + CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +static int decode_length(unsigned char *c, int len) +{ + int tmp; + tmp = c[0]; + if (len < 1) + return -1; + if (tmp >= 252) + { + if (len >= 2) + return 4*c[1] + (tmp&0x3) + 252; + else + return -1; + } else { + return tmp; + } +} + +int count_frames(unsigned char *packet, int len) +{ + int sz = packet[0]&0x7; + + if (sz == 0) + return 1; + else if (sz == 1 || sz == 4) + return 2; + else if (sz == 2 || sz == 5) + return 3; + else if (sz == 3) + { + /* Many packets, same size */ + int count, payload; + int flen = decode_length(packet+1, len-1); + if (flen<=0) + return -1; + payload = len - 2; + if (flen>=252) + payload--; + count = payload/flen; + if (count*flen==payload) + return count; + else + return -1; + } else if (sz == 6) + { + /* Many packets, different sizes */ + int count = 0; + int pos = 1; + int bytes = 1; + while (bytes < len) + { + int tmp=1; + int flen = decode_length(packet+pos, len-bytes); + if (flen==-1) + return -1; + if (flen >= 252) + tmp = 2; + pos += tmp; + bytes += tmp+flen; + count++; + } + if (bytes != len) + return -1; + else + return count; + } else { + + } +} + +#define MAX_FRAMES 256 +int hybrid_merge_packets(unsigned char **packets, int *len, unsigned *output, int maxlen) +{ + unsigned char cfg[MAX_FRAMES]; + unsigned char len[MAX_FRAMES]; + int nb_frames=0; + +} |