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Remove old bitreader code

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bnnm 2020-07-31 16:54:30 +02:00
parent 78ea507e0e
commit 9b4b40d3c8
2 changed files with 0 additions and 159 deletions
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13
src/coding/coding.h
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@ -605,19 +605,6 @@ size_t aac_get_samples(STREAMFILE* sf, off_t start_offset, size_t bytes);
size_t mpeg_get_samples(STREAMFILE* sf, off_t start_offset, size_t bytes);
/* An internal struct to pass around and simulate a bitstream. */
typedef enum { BITSTREAM_MSF, BITSTREAM_VORBIS } vgm_bitstream_t;
typedef struct {
uint8_t* buf; /* buffer to read/write*/
size_t bufsize; /* max size of the buffer */
off_t b_off; /* current offset in bits inside the buffer */
vgm_bitstream_t mode; /* read/write modes */
} vgm_bitstream;
int r_bits(vgm_bitstream* ib, int num_bits, uint32_t* value);
int w_bits(vgm_bitstream* ob, int num_bits, uint32_t value);
/* helper to pass a wrapped, clamped, fake extension-ed, SF to another meta */
STREAMFILE* setup_subfile_streamfile(STREAMFILE* sf, off_t subfile_offset, size_t subfile_size, const char* extension);

146
src/coding/coding_utils.c
View File

@ -1012,152 +1012,6 @@ size_t aac_get_samples(STREAMFILE *streamFile, off_t start_offset, size_t bytes)
return frames * samples_per_frame;
}
/* ******************************************** */
/* BITSTREAM */
/* ******************************************** */
/* Read bits (max 32) from buf and update the bit offset. Vorbis packs values in LSB order and byte by byte.
* (ex. from 2 bytes 00100111 00000001 we can could read 4b=0111 and 6b=010010, 6b=remainder (second value is split into the 2nd byte) */
static int r_bits_vorbis(vgm_bitstream * ib, int num_bits, uint32_t * value) {
off_t off, pos;
int i, bit_buf, bit_val;
if (num_bits == 0) return 1;
if (num_bits > 32 || num_bits < 0 || ib->b_off + num_bits > ib->bufsize*8) goto fail;
*value = 0; /* set all bits to 0 */
off = ib->b_off / 8; /* byte offset */
pos = ib->b_off % 8; /* bit sub-offset */
for (i = 0; i < num_bits; i++) {
bit_buf = (1U << pos) & 0xFF; /* bit check for buf */
bit_val = (1U << i); /* bit to set in value */
if (ib->buf[off] & bit_buf) /* is bit in buf set? */
*value |= bit_val; /* set bit */
pos++; /* new byte starts */
if (pos%8 == 0) {
pos = 0;
off++;
}
}
ib->b_off += num_bits;
return 1;
fail:
return 0;
}
/* Write bits (max 32) to buf and update the bit offset. Vorbis packs values in LSB order and byte by byte.
* (ex. writing 1101011010 from b_off 2 we get 01101011 00001101 (value split, and 11 in the first byte skipped)*/
static int w_bits_vorbis(vgm_bitstream * ob, int num_bits, uint32_t value) {
off_t off, pos;
int i, bit_val, bit_buf;
if (num_bits == 0) return 1;
if (num_bits > 32 || num_bits < 0 || ob->b_off + num_bits > ob->bufsize*8) goto fail;
off = ob->b_off / 8; /* byte offset */
pos = ob->b_off % 8; /* bit sub-offset */
for (i = 0; i < num_bits; i++) {
bit_val = (1U << i); /* bit check for value */
bit_buf = (1U << pos) & 0xFF; /* bit to set in buf */
if (value & bit_val) /* is bit in val set? */
ob->buf[off] |= bit_buf; /* set bit */
else
ob->buf[off] &= ~bit_buf; /* unset bit */
pos++; /* new byte starts */
if (pos%8 == 0) {
pos = 0;
off++;
}
}
ob->b_off += num_bits;
return 1;
fail:
return 0;
}
/* Read bits (max 32) from buf and update the bit offset. Order is BE (MSF). */
static int r_bits_msf(vgm_bitstream * ib, int num_bits, uint32_t * value) {
off_t off, pos;
int i, bit_buf, bit_val;
if (num_bits == 0) return 1;
if (num_bits > 32 || num_bits < 0 || ib->b_off + num_bits > ib->bufsize*8) goto fail;
*value = 0; /* set all bits to 0 */
off = ib->b_off / 8; /* byte offset */
pos = ib->b_off % 8; /* bit sub-offset */
for (i = 0; i < num_bits; i++) {
bit_buf = (1U << (8-1-pos)) & 0xFF; /* bit check for buf */
bit_val = (1U << (num_bits-1-i)); /* bit to set in value */
if (ib->buf[off] & bit_buf) /* is bit in buf set? */
*value |= bit_val; /* set bit */
pos++;
if (pos%8 == 0) { /* new byte starts */
pos = 0;
off++;
}
}
ib->b_off += num_bits;
return 1;
fail:
return 0;
}
/* Write bits (max 32) to buf and update the bit offset. Order is BE (MSF). */
static int w_bits_msf(vgm_bitstream * ob, int num_bits, uint32_t value) {
off_t off, pos;
int i, bit_val, bit_buf;
if (num_bits == 0) return 1;
if (num_bits > 32 || num_bits < 0 || ob->b_off + num_bits > ob->bufsize*8) goto fail;
off = ob->b_off / 8; /* byte offset */
pos = ob->b_off % 8; /* bit sub-offset */
for (i = 0; i < num_bits; i++) {
bit_val = (1U << (num_bits-1-i)); /* bit check for value */
bit_buf = (1U << (8-1-pos)) & 0xFF; /* bit to set in buf */
if (value & bit_val) /* is bit in val set? */
ob->buf[off] |= bit_buf; /* set bit */
else
ob->buf[off] &= ~bit_buf; /* unset bit */
pos++;
if (pos%8 == 0) { /* new byte starts */
pos = 0;
off++;
}
}
ob->b_off += num_bits;
return 1;
fail:
return 0;
}
int r_bits(vgm_bitstream * ib, int num_bits, uint32_t * value) {
if (ib->mode == BITSTREAM_VORBIS)
return r_bits_vorbis(ib,num_bits,value);
else
return r_bits_msf(ib,num_bits,value);
}
int w_bits(vgm_bitstream * ob, int num_bits, uint32_t value) {
if (ob->mode == BITSTREAM_VORBIS)
return w_bits_vorbis(ob,num_bits,value);
else
return w_bits_msf(ob,num_bits,value);
}
/* ******************************************** */
/* CUSTOM STREAMFILES */
/* ******************************************** */