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vgmstream/src/coding/ffmpeg_decoder_utils_switch_opus.c

347 lines
14 KiB
C
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#include "coding.h"
#include "ffmpeg_decoder_utils.h"
#include <string.h>
#ifdef VGM_USE_FFMPEG
/**
* Xiph Opus without Ogg layer and custom packet headers. This creates valid Ogg pages with single Opus packets.
* Wwise opus looks encoded roughly like "opusenc --hard-cbr --framesize 40". The packets are Opus-compliant.
*
* Info, CRC and stuff:
* https://www.opus-codec.org/docs/
* https://tools.ietf.org/html/rfc7845.html
* https://github.com/hcs64/ww2ogg
*/
static size_t make_oggs_page(uint8_t * buf, int buf_size, size_t data_size, int page_sequence, int granule);
static size_t make_opus_header(uint8_t * buf, int buf_size, int channels, int skip, int sample_rate);
static size_t make_opus_comment(uint8_t * buf, int buf_size);
static uint32_t get_opus_samples_per_frame(const uint8_t * data, int Fs);
size_t ffmpeg_make_opus_header(uint8_t * buf, int buf_size, int channels, int skip, int sample_rate) {
int buf_done = 0;
size_t bytes;
if (buf_size < 0x100) /* approx */
goto fail;
/* make header */
bytes = make_opus_header(buf+buf_done + 0x1c,buf_size, channels, skip, sample_rate);
make_oggs_page(buf+buf_done + 0x00,buf_size, bytes, 0, 0);
buf_done += 0x1c + bytes;
/* make comment */
bytes = make_opus_comment(buf+buf_done + 0x1c,buf_size);
make_oggs_page(buf+buf_done + 0x00,buf_size, bytes, 1, 0);
buf_done += 0x1c + bytes;
return buf_done;
fail:
return 0;
}
int ffmpeg_custom_read_switch_opus(ffmpeg_codec_data *data, uint8_t *buf, int buf_size) {
uint8_t v_buf[0x8000]; /* intermediate buffer, could be simplified */
int buf_done = 0;
uint64_t real_offset = data->real_offset;
uint64_t virtual_offset = data->virtual_offset - data->header_size;
uint64_t virtual_base = data->virtual_base;
if (data->config.sequence == 0)
data->config.sequence = 2;
/* read and transform Wwise Opus block into Ogg Opus block by making Ogg pages */
while (buf_done < buf_size) {
int bytes_to_copy, samples_per_frame;
size_t extra_size = 0, gap_size = 0;
size_t data_size = read_32bitBE(real_offset, data->streamfile);
/* 0x00: data size, 0x04: ?, 0x08+: data */
/* setup */
extra_size = 0x1b + (int)(data_size / 0xFF + 1); /* OggS page: base size + lacing values */
if (buf_done == 0) /* first read */
gap_size = virtual_offset - virtual_base; /* might start a few bytes into the block */
if (data_size + extra_size > 0x8000) {
VGM_LOG("WW OPUS: total size bigger than buffer at %lx\n", (off_t)real_offset);
return 0;
}
bytes_to_copy = data_size + extra_size - gap_size;
if (bytes_to_copy > buf_size - buf_done)
bytes_to_copy = buf_size - buf_done;
/* transform */
read_streamfile(v_buf + extra_size, real_offset + 0x08, data_size, data->streamfile);
samples_per_frame = get_opus_samples_per_frame(v_buf + extra_size, 48000); /* fixed? */
make_oggs_page(v_buf,0x8000, data_size, data->config.sequence, data->config.samples_done + samples_per_frame);
memcpy(buf + buf_done, v_buf + gap_size, bytes_to_copy);
/* move when block is fully done */
if (data_size + extra_size == bytes_to_copy + gap_size) {
real_offset += 0x04 + 0x04 + data_size;
virtual_base += data_size + extra_size;
data->config.sequence++;
data->config.samples_done += samples_per_frame;
}
buf_done += bytes_to_copy;
}
data->real_offset = real_offset;
data->virtual_base = virtual_base;
return buf_size;
}
int64_t ffmpeg_custom_seek_switch_opus(ffmpeg_codec_data *data, int64_t virtual_offset) {
int64_t real_offset, virtual_base;
int64_t current_virtual_offset = data->virtual_offset;
/* find Wwise block start closest to offset; a 0x1E8 block expands to 0x1D + 0x1E0 (oggs + data) */
if (virtual_offset > current_virtual_offset) { /* seek after current: start from current block */
real_offset = data->real_offset;
virtual_base = data->virtual_base;
}
else { /* seek before current: start from the beginning */
real_offset = data->real_start;
virtual_base = 0;
data->config.sequence = 0;
data->config.samples_done = 0;
}
/* find target block */
while (virtual_base < virtual_offset) {
size_t extra_size;
size_t data_size = read_32bitBE(real_offset, data->streamfile);
extra_size = 0x1b + (int)(data_size / 0xFF + 1); /* OggS page: base size + lacing values */
/* stop if virtual_offset lands inside current block */
if (data_size + extra_size > virtual_offset)
break;
real_offset += 0x04 + 0x04 + data_size;
virtual_base += data_size + extra_size;
}
/* closest we can use for reads */
data->real_offset = real_offset;
data->virtual_base = virtual_base;
return virtual_offset;
}
int64_t ffmpeg_custom_size_switch_opus(ffmpeg_codec_data *data) {
uint64_t real_offset = data->real_start;
uint64_t real_end_offset = data->real_start + data->real_size;
uint64_t virtual_size = data->header_size;
/* count all Wwise Opus blocks size + OggS page size */
while (real_offset < real_end_offset) {
size_t extra_size;
size_t data_size = read_32bitBE(real_offset, data->streamfile);
/* 0x00: data size, 0x04: ? (not a sequence or CRC), 0x08+: data */
extra_size = 0x1b + (int)(data_size / 0xFF + 1); /* OggS page: base size + lacing values */
real_offset += 0x04 + 0x04 + data_size;
virtual_size += extra_size + data_size;
}
return virtual_size;
}
/* ************************************************** */
/* from ww2ogg - from Tremor (lowmem) */
static uint32_t crc_lookup[256]={
0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9, 0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005,
0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61, 0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd,
0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9, 0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75,
0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011, 0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd,
0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039, 0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5,
0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81, 0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d,
0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49, 0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95,
0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1, 0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d,
0x34867077,0x30476dc0,0x3d044b19,0x39c556ae, 0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072,
0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16, 0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca,
0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde, 0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02,
0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066, 0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba,
0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e, 0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692,
0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6, 0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a,
0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e, 0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2,
0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686, 0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a,
0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637, 0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb,
0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f, 0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53,
0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47, 0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b,
0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff, 0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623,
0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7, 0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b,
0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f, 0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3,
0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7, 0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b,
0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f, 0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3,
0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640, 0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c,
0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8, 0x68860bfd,0x6c47164a,0x61043093,0x65c52d24,
0x119b4be9,0x155a565e,0x18197087,0x1cd86d30, 0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec,
0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088, 0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654,
0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0, 0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c,
0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18, 0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4,
0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0, 0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c,
0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668, 0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4
};
/* from ww2ogg */
static uint32_t get_oggs_checksum(uint8_t * data, int bytes) {
uint32_t crc_reg=0;
int i;
for(i=0;i<bytes;++i)
crc_reg=(crc_reg<<8)^crc_lookup[((crc_reg >> 24)&0xff)^data[i]];
return crc_reg;
}
/* from opus_decoder.c */
static uint32_t get_opus_samples_per_frame(const uint8_t * data, int Fs) {
int audiosize;
if (data[0]&0x80)
{
audiosize = ((data[0]>>3)&0x3);
audiosize = (Fs<<audiosize)/400;
} else if ((data[0]&0x60) == 0x60)
{
audiosize = (data[0]&0x08) ? Fs/50 : Fs/100;
} else {
audiosize = ((data[0]>>3)&0x3);
if (audiosize == 3)
audiosize = Fs*60/1000;
else
audiosize = (Fs<<audiosize)/100;
}
return audiosize;
}
static size_t make_oggs_page(uint8_t * buf, int buf_size, size_t data_size, int page_sequence, int granule) {
size_t page_done, lacing_done = 0;
uint64_t absolute_granule = granule; /* seem wrong values matter for Opus (0, less than real samples, etc) */
int header_type_flag = (page_sequence==0 ? 2 : 0);
int stream_serial_number = 0x7667; /* 0 is legal, but should be specified */
int checksum = 0;
int segment_count;
if (0x1b + (data_size/0xFF + 1) + data_size > buf_size) {
VGM_LOG("WW OPUS: buffer can't hold OggS page\n");
goto fail;
}
segment_count = (int)(data_size / 0xFF + 1);
put_32bitBE(buf+0x00, 0x4F676753); /* capture pattern ("OggS") */
put_8bit (buf+0x04, 0); /* stream structure version, fixed */
put_8bit (buf+0x05, header_type_flag); /* bitflags (0: normal, continued = 1, first = 2, last = 4) */
put_32bitLE(buf+0x06, (uint32_t)(absolute_granule >> 0 & 0xFFFFFFFF)); /* lower */
put_32bitLE(buf+0x0A, (uint32_t)(absolute_granule >> 32 & 0xFFFFFFFF)); /* upper */
put_32bitLE(buf+0x0E, stream_serial_number); /* for interleaved multi-streams */
put_32bitLE(buf+0x12, page_sequence);
put_32bitLE(buf+0x16, checksum); /* 0 for now, until all data is written */
put_8bit (buf+0x1A, segment_count); /* count of all lacing values */
/* segment table: size N in "lacing values" (ex. 0x20E=0xFF+FF+10; 0xFF=0xFF+00) */
page_done = 0x1B;
while (lacing_done < data_size) {
int bytes = data_size - lacing_done;
if (bytes > 0xFF)
bytes = 0xFF;
put_8bit(buf+page_done, bytes);
page_done++;
lacing_done += bytes;
if (lacing_done == data_size && bytes == 0xFF) {
put_8bit(buf+page_done, 0x00);
page_done++;
}
}
/* data */
//memcpy(buf+page_done, data_buf, data_size); /* data must be copied before this call */
page_done += data_size;
/* final checksum */
checksum = get_oggs_checksum(buf, page_done);
put_32bitLE(buf+0x16, checksum);
return page_done;
fail:
return 0;
}
static size_t make_opus_header(uint8_t * buf, int buf_size, int channels, int skip, int sample_rate) {
size_t header_size = 0x13;
int output_gain = 0;
int channel_papping_family = 0;
if (header_size > buf_size) {
VGM_LOG("WW OPUS: buffer can't hold header\n");
goto fail;
}
put_32bitBE(buf+0x00, 0x4F707573); /* header magic ("Opus") */
put_32bitBE(buf+0x04, 0x48656164); /* header magic ("Head") */
put_8bit (buf+0x08, 1); /* version, fixed */
put_8bit (buf+0x09, channels);
put_16bitLE(buf+0x0A, skip);
put_32bitLE(buf+0x0c, sample_rate);
put_16bitLE(buf+0x10, output_gain);
put_8bit (buf+0x12, channel_papping_family);
return header_size;
fail:
return 0;
}
static size_t make_opus_comment(uint8_t * buf, int buf_size) {
size_t comment_size;
int vendor_string_length, user_comment_0_length;
char * vendor_string = "vgmstream";
char * user_comment_0_string = "vgmstream Opus converter";
vendor_string_length = strlen(vendor_string);
user_comment_0_length = strlen(user_comment_0_string);
comment_size = 0x14 + vendor_string_length + user_comment_0_length;
if (comment_size > buf_size) {
VGM_LOG("WW OPUS: buffer can't hold comment\n");
goto fail;
}
put_32bitBE(buf+0x00, 0x4F707573); /* header magic ("Opus") */
put_32bitBE(buf+0x04, 0x54616773); /* header magic ("Tags") */
put_32bitLE(buf+0x08, vendor_string_length);
memcpy(buf+0x0c, vendor_string, vendor_string_length);
put_32bitLE(buf+0x0c + vendor_string_length+0x00, 1); /* user_comment_list_length */
put_32bitLE(buf+0x0c + vendor_string_length+0x04, user_comment_0_length);
memcpy(buf+0x0c + vendor_string_length+0x08, user_comment_0_string, user_comment_0_length);
return comment_size;
fail:
return 0;
}
#endif
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