21 #include "../SDL_internal.h" 62 rogue_feel = (
Uint8 *) format +
sizeof(*format);
63 if (
sizeof(*format) == 16) {
65 rogue_feel +=
sizeof(
Uint16);
68 rogue_feel +=
sizeof(
Uint16);
70 rogue_feel +=
sizeof(
Uint16);
77 rogue_feel +=
sizeof(
Uint16);
79 rogue_feel +=
sizeof(
Uint16);
88 const Sint32 max_audioval = ((1 << (16 - 1)) - 1);
89 const Sint32 min_audioval = -(1 << (16 - 1));
90 const Sint32 adaptive[] = {
91 230, 230, 230, 230, 307, 409, 512, 614,
92 768, 614, 512, 409, 307, 230, 230, 230
96 new_sample = ((state->
iSamp1 * coeff[0]) +
97 (state->
iSamp2 * coeff[1])) / 256;
99 new_sample += state->
iDelta * (nybble - 0x10);
101 new_sample += state->
iDelta * nybble;
103 if (new_sample < min_audioval) {
104 new_sample = min_audioval;
105 }
else if (new_sample > max_audioval) {
106 new_sample = max_audioval;
108 delta = ((
Sint32) state->
iDelta * adaptive[nybble]) / 256;
122 Uint8 *freeable, *encoded, *decoded;
123 Sint32 encoded_len, samplesleft;
130 encoded_len = *audio_len;
131 encoded = *audio_buf;
132 freeable = *audio_buf;
137 if (*audio_buf ==
NULL) {
140 decoded = *audio_buf;
152 state[0]->
iDelta = ((encoded[1] << 8) | encoded[0]);
153 encoded +=
sizeof(
Sint16);
155 state[1]->
iDelta = ((encoded[1] << 8) | encoded[0]);
156 encoded +=
sizeof(
Sint16);
158 state[0]->
iSamp1 = ((encoded[1] << 8) | encoded[0]);
159 encoded +=
sizeof(
Sint16);
161 state[1]->
iSamp1 = ((encoded[1] << 8) | encoded[0]);
162 encoded +=
sizeof(
Sint16);
164 state[0]->
iSamp2 = ((encoded[1] << 8) | encoded[0]);
165 encoded +=
sizeof(
Sint16);
167 state[1]->
iSamp2 = ((encoded[1] << 8) | encoded[0]);
168 encoded +=
sizeof(
Sint16);
174 decoded[0] = state[0]->
iSamp2 & 0xFF;
175 decoded[1] = state[0]->
iSamp2 >> 8;
178 decoded[0] = state[1]->
iSamp2 & 0xFF;
179 decoded[1] = state[1]->
iSamp2 >> 8;
182 decoded[0] = state[0]->
iSamp1 & 0xFF;
183 decoded[1] = state[0]->
iSamp1 >> 8;
186 decoded[0] = state[1]->
iSamp1 & 0xFF;
187 decoded[1] = state[1]->
iSamp1 >> 8;
194 while (samplesleft > 0) {
195 nybble = (*encoded) >> 4;
197 decoded[0] = new_sample & 0xFF;
199 decoded[1] = new_sample & 0xFF;
202 nybble = (*encoded) & 0x0F;
204 decoded[0] = new_sample & 0xFF;
206 decoded[1] = new_sample & 0xFF;
244 rogue_feel = (
Uint8 *) format +
sizeof(*format);
245 if (
sizeof(*format) == 16) {
247 rogue_feel +=
sizeof(
Uint16);
256 const Sint32 max_audioval = ((1 << (16 - 1)) - 1);
257 const Sint32 min_audioval = -(1 << (16 - 1));
258 const int index_table[16] = {
264 const Sint32 step_table[89] = {
265 7, 8, 9, 10, 11, 12, 13, 14, 16, 17, 19, 21, 23, 25, 28, 31,
266 34, 37, 41, 45, 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130,
267 143, 157, 173, 190, 209, 230, 253, 279, 307, 337, 371, 408,
268 449, 494, 544, 598, 658, 724, 796, 876, 963, 1060, 1166, 1282,
269 1411, 1552, 1707, 1878, 2066, 2272, 2499, 2749, 3024, 3327,
270 3660, 4026, 4428, 4871, 5358, 5894, 6484, 7132, 7845, 8630,
271 9493, 10442, 11487, 12635, 13899, 15289, 16818, 18500, 20350,
272 22385, 24623, 27086, 29794, 32767
277 if (state->
index > 88) {
279 }
else if (state->
index < 0) {
283 step = step_table[(int)state->
index];
288 delta += (step >> 1);
290 delta += (step >> 2);
296 state->
index += index_table[nybble];
299 if (state->
sample > max_audioval) {
300 state->
sample = max_audioval;
301 }
else if (state->
sample < min_audioval) {
302 state->
sample = min_audioval;
310 int channel,
int numchannels,
317 decoded += (channel * 2);
318 for (i = 0; i < 4; ++
i) {
319 nybble = (*encoded) & 0x0F;
321 decoded[0] = new_sample & 0xFF;
323 decoded[1] = new_sample & 0xFF;
324 decoded += 2 * numchannels;
326 nybble = (*encoded) >> 4;
328 decoded[0] = new_sample & 0xFF;
330 decoded[1] = new_sample & 0xFF;
331 decoded += 2 * numchannels;
341 Uint8 *freeable, *encoded, *decoded;
342 Sint32 encoded_len, samplesleft;
343 unsigned int c, channels;
348 SDL_SetError(
"IMA ADPCM decoder can only handle %u channels",
355 encoded_len = *audio_len;
356 encoded = *audio_buf;
357 freeable = *audio_buf;
362 if (*audio_buf ==
NULL) {
365 decoded = *audio_buf;
370 for (c = 0; c < channels; ++
c) {
372 state[
c].
sample = ((encoded[1] << 8) | encoded[0]);
374 if (state[c].
sample & 0x8000) {
377 state[
c].
index = *encoded++;
379 if (*encoded++ != 0) {
391 while (samplesleft > 0) {
392 for (c = 0; c < channels; ++
c) {
394 c, channels, &state[c]);
398 decoded += (channels * 8 * 2);
410 const double DIVBY8388608 = 0.00000011920928955078125;
411 const Uint32 original_len = *audio_len;
424 *audio_len = expanded_len;
427 src = (ptr + original_len) - 3;
428 dst = ((
Uint32 *) (ptr + expanded_len)) - 1;
429 for (i = 0; i <
samples; i++) {
432 (((
Uint32) src[1]) << 16) |
433 (((
Uint32) src[0]) << 8) )) >> 8;
434 const double scaled = (((double) converted) * DIVBY8388608);
436 *(dst--) = (
Sint32) (scaled * 2147483647.0);
444 static const Uint8 extensible_pcm_guid[16] = { 1, 0, 0, 0, 0, 0, 16, 0, 128, 0, 0, 170, 0, 56, 155, 113 };
445 static const Uint8 extensible_ieee_guid[16] = { 3, 0, 0, 0, 0, 0, 16, 0, 128, 0, 0, 170, 0, 56, 155, 113 };
454 int IEEE_float_encoded, MS_ADPCM_encoded, IMA_ADPCM_encoded;
479 if (wavelen ==
WAVE) {
486 if ((RIFFchunk !=
RIFF) || (WAVEmagic !=
WAVE)) {
491 headerDiff +=
sizeof(
Uint32);
504 headerDiff += lenread + 2 *
sizeof(
Uint32);
514 IEEE_float_encoded = MS_ADPCM_encoded = IMA_ADPCM_encoded = 0;
520 IEEE_float_encoded = 1;
529 MS_ADPCM_encoded = 1;
537 IMA_ADPCM_encoded = 1;
553 IEEE_float_encoded = 1;
570 if (IEEE_float_encoded) {
579 if (MS_ADPCM_encoded || IMA_ADPCM_encoded) {
621 *audio_len = lenread;
622 *audio_buf = chunk.
data;
624 headerDiff += lenread + 2 *
sizeof(
Uint32);
626 headerDiff += 2 *
sizeof(
Uint32);
628 if (MS_ADPCM_encoded) {
634 if (IMA_ADPCM_encoded) {
650 *audio_len &= ~(samplesize - 1);
static int InitIMA_ADPCM(WaveFMT *format)
static void Fill_IMA_ADPCM_block(Uint8 *decoded, Uint8 *encoded, int channel, int numchannels, struct IMA_ADPCM_decodestate *state)
void SDL_FreeWAV(Uint8 *audio_buf)
#define SDL_RWread(ctx, ptr, size, n)
static struct IMA_ADPCM_decoder IMA_ADPCM_state
SDL_AudioSpec * SDL_LoadWAV_RW(SDL_RWops *src, int freesrc, SDL_AudioSpec *spec, Uint8 **audio_buf, Uint32 *audio_len)
struct MS_ADPCM_decodestate state[2]
static Sint32 MS_ADPCM_nibble(struct MS_ADPCM_decodestate *state, Uint8 nybble, Sint16 *coeff)
static int MS_ADPCM_decode(Uint8 **audio_buf, Uint32 *audio_len)
#define SDL_RWseek(ctx, offset, whence)
static const Uint8 extensible_ieee_guid[16]
GLint GLint GLsizei GLsizei GLsizei GLint GLenum format
static int IMA_ADPCM_decode(Uint8 **audio_buf, Uint32 *audio_len)
#define SDL_AUDIO_BITSIZE(x)
static int ConvertSint24ToSint32(Uint8 **audio_buf, Uint32 *audio_len)
static const Uint8 extensible_pcm_guid[16]
struct IMA_ADPCM_decodestate state[2]
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
static Sint32 IMA_ADPCM_nibble(struct IMA_ADPCM_decodestate *state, Uint8 nybble)
#define SDL_OutOfMemory()
static int InitMS_ADPCM(WaveFMT *format)
#define SDL_arraysize(array)
static int ReadChunk(SDL_RWops *src, Chunk *chunk)
static struct MS_ADPCM_decoder MS_ADPCM_state