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main.c
154
main.c
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@ -1,19 +1,33 @@
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#include <stdint.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <arpa/inet.h>
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// TODO autodetect endianness here
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#define fromle(x) (x)
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// get bit big endian
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#define bitb(x, y) ((((uint8_t*)(x))[y >> 3] >> (7 - (y & 7))) & 1)
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//#define bitb(x, y) ((((uint8_t*)(x))[(y) >> 3] >> (7 - ((y) & 7))) & 1)
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uint8_t bitb(uint8_t* s, uint32_t b) {
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return (s[b >> 3] >> (7 - (b & 7))) & 1;
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}
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#define bitrb(x, y, z) ibitrb((uint8_t*)x, y, z)
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#define cast(x, y) (*((x*)&(y)))
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uint32_t bitrb(uint8_t* s, uint32_t b, char e) { // bit range big endian
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#define cblimit 21
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#define cblimit_short 12
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uint32_t ibitrb(uint8_t* s, uint32_t* b, char e) { // bit range big endian
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uint32_t a = 0;
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for(int i = 0; i < e; i++) a = (a << 1) | bitb(s, b+i);
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printf("bitrb %X\n", a);
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for(int i = 0; i < e; i++) a = (a << 1) | bitb(s, (*b)+i);
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//printf("bitrb %i at %i: 0x%X, 0d%u\n", e, *b, a, a);
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*b += e;
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return a;
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}
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@ -5127,6 +5141,32 @@ uint32_t verify_l3(uint32_t d) { // returns 0 if header is valid
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return (d & 0xFFFE0000) ^ 0xFFFA0000;
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}
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typedef struct {
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uint8_t x;
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uint8_t y;
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} coord;
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// TODO possiblility block_type is undefined if blocksplit not set. read spec for blocksplit_flag and block_type
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// table to get length of scalefactor bands
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uint8_t sfcom[16][2] = {
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{0,0},
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{0,1},
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{0,2},
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{0,3},
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{3,0},
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{1,1},
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{1,2},
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{1,3},
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{2,1},
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{2,2},
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{2,3},
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{3,1},
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{3,2},
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{3,3},
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{4,2},
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{4,3},
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};
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void rdl3(uint32_t* s, mp3_frame* m) {
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uint32_t d = ntohl(*(s++));
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m->hdr = d;
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@ -5143,9 +5183,98 @@ void rdl3(uint32_t* s, mp3_frame* m) {
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m->crc = htons(*((uint16_t*)s)); // only valid if m->crc
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int bp = m->prot << 4; // bitpointer
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if(m->mode) { // mono
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uint32_t bp = m->prot << 4; // bitpointer
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uint16_t main_data_end = bitrb(s, &bp, 9);
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char private_bits = bitrb(s, &bp, 5 - ((m->mode != 3) << 1));
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char num_ch = 1 + (m->mode != 3);
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char scfsi[4][num_ch];
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uint16_t part2_3_length[2][num_ch];
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uint16_t big_values[2][num_ch];
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uint8_t global_gain[2][num_ch];
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uint8_t scalefac_compress[2][num_ch];
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uint8_t blocksplit_flag[2][num_ch];
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// used if blocksplit flag is set
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uint8_t block_type[2][num_ch];
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uint8_t switch_point[2][num_ch];
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uint8_t table_select[2][2][num_ch];
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uint8_t subblock_gain[3][2][num_ch];
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// used if NOT set
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uint8_t region_address1[2][num_ch];
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uint8_t region_address2[2][num_ch];
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uint8_t preflag[2][num_ch];
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uint8_t scalefac_scale[2][num_ch];
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uint8_t count1table_select[2][num_ch];
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for(int band = 0; band < 4; band++) for(int ch = 0; ch < num_ch; ch++) scfsi[band][ch] = bitrb(s, &bp, 1);
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for(int gr = 0; gr < 2; gr++) for(int ch = 0; ch < num_ch; ch++) {
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part2_3_length[gr][ch] = bitrb(s, &bp, 12);
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big_values[gr][ch] = bitrb(s, &bp, 9);
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global_gain[gr][ch] = bitrb(s, &bp, 8);
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scalefac_compress[gr][ch] = bitrb(s, &bp, 4);
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blocksplit_flag[gr][ch] = bitrb(s, &bp, 1);
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if(blocksplit_flag[gr][ch]) {
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block_type[gr][ch] = bitrb(s, &bp, 2);
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switch_point[gr][ch] = bitrb(s, &bp, 1);
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for(int reg = 0; reg < 2; reg++) table_select[reg][gr][ch] = bitrb(s, &bp, 5);
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for(int window = 0; window < 3; window++) subblock_gain[window][gr][ch] = bitrb(s, &bp, 3);
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} else {
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for(int reg = 0; reg < 3; reg++) table_select[reg][gr][ch] = bitrb(s, &bp, 5);
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region_address1[gr][ch] = bitrb(s, &bp, 4);
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region_address2[gr][ch] = bitrb(s, &bp, 3);
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}
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preflag[gr][ch] = bitrb(s, &bp, 1);
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scalefac_scale[gr][ch] = bitrb(s, &bp, 1);
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count1table_select[gr][ch] = bitrb(s, &bp, 1);
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}
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// begin to parse main_data
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// TODO completely unclear where it is supposed to start - comment from specification reproduced below
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/***
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The main_data follows. It does not follow the above side information in the
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bitstream. The main_data ends at a location in the main_data bitstream
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preceding the frame header of the following frame at an offset given by the
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value of main_data_end (see definition of main_data_end and 3-Annex Fig.3-
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A.7.1
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***/
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int bpsave = bp;
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for(int gr = 0; gr < 2; gr++) for(int ch = 0; ch < num_ch; ch++) {
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if(blocksplit_flag[gr][ch] && block_type[gr][ch] == 2) {
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// long window(?)
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for(int cb = 0; cb < (switch_point[gr][ch] ? 8 : 0); cb++) if(!scfsi[cb] | !gr) {
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// TODO scalefac[cb][gr][ch]
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// use scalefac_compress[gr][ch]
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int sfcd;
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if(block_type[gr][ch] != 2) sfcd = cb > 10;
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else if(switch_point[gr][ch]) {
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// TODO if block_type is 2 and switch_point is 1
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} else sfcd = cb > 5;
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//scalefac[cb][0/*window*/][gr][ch] = bitrb(s, &bp, sfcom[scalefac_compress[gr][ch]][sfcd]);
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}
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// short window(?)
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for(int cb = (switch_point[gr][ch] ? 3 : 0); cb < cblimit_short; cb++) for(int window = 0; window < 3; window++) if(!scfsi[cb] | !gr) {
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// TODO scalefac[cb][gr][ch]
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// use scalefac_compress[gr][ch]
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}
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} else {
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for(int cb = 0; cb < cblimit; cb++) if(!scfsi[cb] | !gr) {
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// TODO scalefac[cb][gr][ch]
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// use scalefac_compress[gr][ch]
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}
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// TODO huffman bits
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unsigned short csz = 16, ci = 0;
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coord* c = malloc(csz * sizeof(coord));
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while(bp < bpsave + part2_3_length[gr][ch]) {
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//bp += huffman(table_select[]);
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}
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}
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}
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}
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@ -5164,11 +5293,20 @@ int main(int argc, char** argv) {
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uint8_t* stream = malloc(s.st_size);
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read(fd, stream, s.st_size);
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static char* yn[2] = {"no", "yes"};
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static char* chtyp[4] = {"stereo", "joint stereo", "dual mono (stereo)", "mono"};
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static char* emph[4] = {"none", "50/15 ms", "reserved", "CCIT J.17"};
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printf("begin reading %s (%u bytes at %p)\n", argv[f], s.st_size, stream);
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printf("begin reading %s (%lu bytes at %p)\n", argv[f], s.st_size, stream);
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if(!memcmp(stream, "ID3", 3)) {
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int d = htonl(*((uint32_t*)(stream + 6)));
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sp += d + 10 + ((stream[5] & 0x10) ? 10 : 0);
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printf("ID3v2 detected, skipping %08X bytes so as not to deal with it\n", sp);
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}
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if(!memcmp(stream + s.st_size - 128, "TAG", 3)) printf("TAG detected :)\n");
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while(!verify_l3(*(uint32_t*)(stream + sp))) {
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printf("frame %u sync at %u (%X)!\n", fc, sp, sp);
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@ -5196,5 +5334,7 @@ int main(int argc, char** argv) {
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sp += m.len;
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fc++;
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}
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free(stream);
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}
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}
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