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@ -25,6 +25,7 @@ |
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* Fringe ADPCM codecs (e.g., DK3, DK4, Westwood) |
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* Fringe ADPCM codecs (e.g., DK3, DK4, Westwood) |
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* by Mike Melanson (melanson@pcisys.net) |
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* by Mike Melanson (melanson@pcisys.net) |
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* CD-ROM XA ADPCM codec by BERO |
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* CD-ROM XA ADPCM codec by BERO |
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* EA ADPCM decoder by Robin Kay (komadori@myrealbox.com) |
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* |
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* |
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* Features and limitations: |
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* Features and limitations: |
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* |
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* |
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@ -44,6 +45,13 @@ |
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#define BLKSIZE 1024 |
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#define BLKSIZE 1024 |
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#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1]) |
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#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0]) |
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#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \ |
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(((uint8_t*)(x))[2] << 16) | \
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(((uint8_t*)(x))[1] << 8) | \
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((uint8_t*)(x))[0]) |
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#define CLAMP_TO_SHORT(value) \ |
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#define CLAMP_TO_SHORT(value) \ |
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if (value > 32767) \
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if (value > 32767) \
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value = 32767; \
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value = 32767; \
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@ -97,6 +105,11 @@ static const int xa_adpcm_table[5][2] = { |
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{ 122, -60 } |
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{ 122, -60 } |
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}; |
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}; |
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static int ea_adpcm_table[] = { |
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0, 240, 460, 392, 0, 0, -208, -220, 0, 1, |
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3, 4, 7, 8, 10, 11, 0, -1, -3, -4 |
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}; |
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/* end of tables */ |
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/* end of tables */ |
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typedef struct ADPCMChannelStatus { |
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typedef struct ADPCMChannelStatus { |
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@ -444,6 +457,15 @@ static int adpcm_decode_frame(AVCodecContext *avctx, |
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int decode_top_nibble_next = 0; |
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int decode_top_nibble_next = 0; |
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int diff_channel; |
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int diff_channel; |
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/* EA ADPCM state variables */ |
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uint32_t samples_in_chunk; |
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int32_t previous_left_sample, previous_right_sample; |
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int32_t current_left_sample, current_right_sample; |
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int32_t next_left_sample, next_right_sample; |
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int32_t coeff1l, coeff2l, coeff1r, coeff2r; |
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uint8_t shift_left, shift_right; |
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int count1, count2; |
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if (!buf_size) |
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if (!buf_size) |
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return 0; |
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return 0; |
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@ -715,6 +737,69 @@ static int adpcm_decode_frame(AVCodecContext *avctx, |
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buf_size -= 128; |
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buf_size -= 128; |
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} |
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} |
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break; |
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break; |
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case CODEC_ID_ADPCM_EA: |
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samples_in_chunk = LE_32(src); |
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if (samples_in_chunk >= ((buf_size - 12) * 2)) { |
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src += buf_size; |
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break; |
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} |
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src += 4; |
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current_left_sample = (int16_t)LE_16(src); |
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src += 2; |
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previous_left_sample = (int16_t)LE_16(src); |
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src += 2; |
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current_right_sample = (int16_t)LE_16(src); |
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src += 2; |
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previous_right_sample = (int16_t)LE_16(src); |
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src += 2; |
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for (count1 = 0; count1 < samples_in_chunk/28;count1++) { |
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coeff1l = ea_adpcm_table[(*src >> 4) & 0x0F]; |
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coeff2l = ea_adpcm_table[((*src >> 4) & 0x0F) + 4]; |
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coeff1r = ea_adpcm_table[*src & 0x0F]; |
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coeff2r = ea_adpcm_table[(*src & 0x0F) + 4]; |
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src++; |
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shift_left = ((*src >> 4) & 0x0F) + 8; |
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shift_right = (*src & 0x0F) + 8; |
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src++; |
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for (count2 = 0; count2 < 28; count2++) { |
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next_left_sample = (((*src & 0xF0) << 24) >> shift_left); |
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next_right_sample = (((*src & 0x0F) << 28) >> shift_right); |
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src++; |
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next_left_sample = (next_left_sample +
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(current_left_sample * coeff1l) +
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(previous_left_sample * coeff2l) + 0x80) >> 8; |
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next_right_sample = (next_right_sample +
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(current_right_sample * coeff1r) +
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(previous_right_sample * coeff2r) + 0x80) >> 8; |
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CLAMP_TO_SHORT(next_left_sample); |
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CLAMP_TO_SHORT(next_right_sample); |
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previous_left_sample = current_left_sample; |
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current_left_sample = next_left_sample; |
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previous_right_sample = current_right_sample; |
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current_right_sample = next_right_sample; |
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*samples++ = (unsigned short)current_left_sample; |
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*samples++ = (unsigned short)current_right_sample; |
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} |
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} |
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break; |
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case CODEC_ID_ADPCM_IMA_SMJPEG: |
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c->status[0].predictor = *src; |
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src += 2; |
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c->status[0].step_index = *src++; |
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src++; /* skip another byte before getting to the meat */ |
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while (src < buf + buf_size) { |
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*samples++ = adpcm_ima_expand_nibble(&c->status[0], |
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*src & 0x0F, 3); |
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*samples++ = adpcm_ima_expand_nibble(&c->status[0], |
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(*src >> 4) & 0x0F, 3); |
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src++; |
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} |
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break; |
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default: |
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default: |
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*data_size = 0; |
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*data_size = 0; |
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return -1; |
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return -1; |
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@ -765,9 +850,11 @@ ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav); |
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ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3); |
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ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3); |
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ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4); |
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ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4); |
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ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws); |
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ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WS, adpcm_ima_ws); |
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ADPCM_CODEC(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg); |
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ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms); |
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ADPCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms); |
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ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm); |
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ADPCM_CODEC(CODEC_ID_ADPCM_4XM, adpcm_4xm); |
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ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa); |
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ADPCM_CODEC(CODEC_ID_ADPCM_XA, adpcm_xa); |
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ADPCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx); |
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ADPCM_CODEC(CODEC_ID_ADPCM_ADX, adpcm_adx); |
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ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea); |
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#undef ADPCM_CODEC |
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#undef ADPCM_CODEC |
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