#ifndef MINIMP3_H #define MINIMP3_H /* https://github.com/lieff/minimp3 To the extent possible under law, the author(s) have dedicated all copyright and related and neighboring rights to this software to the public domain worldwide. This software is distributed without any warranty. See <http://creativecommons.org/publicdomain/zero/1.0/>. */ #include <stdint.h> #define MINIMP3_MAX_SAMPLES_PER_FRAME … mp3dec_frame_info_t; mp3dec_t; #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ void mp3dec_init(mp3dec_t *dec); #ifndef MINIMP3_FLOAT_OUTPUT typedef int16_t mp3d_sample_t; #else /* MINIMP3_FLOAT_OUTPUT */ mp3d_sample_t; void mp3dec_f32_to_s16(const float *in, int16_t *out, int num_samples); #endif /* MINIMP3_FLOAT_OUTPUT */ int mp3dec_decode_frame(mp3dec_t *dec, const uint8_t *mp3, int mp3_bytes, mp3d_sample_t *pcm, mp3dec_frame_info_t *info); #ifdef __cplusplus } #endif /* __cplusplus */ #endif /* MINIMP3_H */ #if defined(MINIMP3_IMPLEMENTATION) && !defined(_MINIMP3_IMPLEMENTATION_GUARD) #define _MINIMP3_IMPLEMENTATION_GUARD #include <stdlib.h> #include <string.h> #define MAX_FREE_FORMAT_FRAME_SIZE … #ifndef MAX_FRAME_SYNC_MATCHES #define MAX_FRAME_SYNC_MATCHES … #endif /* MAX_FRAME_SYNC_MATCHES */ #define MAX_L3_FRAME_PAYLOAD_BYTES … #define MAX_BITRESERVOIR_BYTES … #define SHORT_BLOCK_TYPE … #define STOP_BLOCK_TYPE … #define MODE_MONO … #define MODE_JOINT_STEREO … #define HDR_SIZE … #define HDR_IS_MONO(h) … #define HDR_IS_MS_STEREO(h) … #define HDR_IS_FREE_FORMAT(h) … #define HDR_IS_CRC(h) … #define HDR_TEST_PADDING(h) … #define HDR_TEST_MPEG1(h) … #define HDR_TEST_NOT_MPEG25(h) … #define HDR_TEST_I_STEREO(h) … #define HDR_TEST_MS_STEREO(h) … #define HDR_GET_STEREO_MODE(h) … #define HDR_GET_STEREO_MODE_EXT(h) … #define HDR_GET_LAYER(h) … #define HDR_GET_BITRATE(h) … #define HDR_GET_SAMPLE_RATE(h) … #define HDR_GET_MY_SAMPLE_RATE(h) … #define HDR_IS_FRAME_576(h) … #define HDR_IS_LAYER_1(h) … #define BITS_DEQUANTIZER_OUT … #define MAX_SCF … #define MAX_SCFI … #define MINIMP3_MIN(a, b) … #define MINIMP3_MAX(a, b) … #if !defined(MINIMP3_NO_SIMD) #if !defined(MINIMP3_ONLY_SIMD) && (defined(_M_X64) || defined(__x86_64__) || defined(__aarch64__) || defined(_M_ARM64)) /* x64 always have SSE2, arm64 always have neon, no need for generic code */ #define MINIMP3_ONLY_SIMD #endif /* SIMD checks... */ #if (defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64))) || ((defined(__i386__) || defined(__x86_64__)) && defined(__SSE2__)) #if defined(_MSC_VER) #include <intrin.h> #endif /* defined(_MSC_VER) */ #include <immintrin.h> #define HAVE_SSE … #define HAVE_SIMD … #define VSTORE … #define VLD … #define VSET … #define VADD … #define VSUB … #define VMUL … #define VMAC(a, x, y) … #define VMSB(a, x, y) … #define VMUL_S(x, s) … #define VREV(x) … f4; #if defined(_MSC_VER) || defined(MINIMP3_ONLY_SIMD) #define minimp3_cpuid … #else /* defined(_MSC_VER) || defined(MINIMP3_ONLY_SIMD) */ static __inline__ __attribute__((always_inline)) void minimp3_cpuid(int CPUInfo[], const int InfoType) { #if defined(__PIC__) __asm__ __volatile__( #if defined(__x86_64__) "push %%rbx\n" "cpuid\n" "xchgl %%ebx, %1\n" "pop %%rbx\n" #else /* defined(__x86_64__) */ "xchgl %%ebx, %1\n" "cpuid\n" "xchgl %%ebx, %1\n" #endif /* defined(__x86_64__) */ : "=a" (CPUInfo[0]), "=r" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3]) : "a" (InfoType)); #else /* defined(__PIC__) */ __asm__ __volatile__( "cpuid" : "=a" (CPUInfo[0]), "=b" (CPUInfo[1]), "=c" (CPUInfo[2]), "=d" (CPUInfo[3]) : "a" (InfoType)); #endif /* defined(__PIC__)*/ } #endif /* defined(_MSC_VER) || defined(MINIMP3_ONLY_SIMD) */ static int have_simd(void) { … } #elif defined(__ARM_NEON) || defined(__aarch64__) || defined(_M_ARM64) #include <arm_neon.h> #define HAVE_SSE … #define HAVE_SIMD … #define VSTORE … #define VLD … #define VSET … #define VADD … #define VSUB … #define VMUL … #define VMAC … #define VMSB … #define VMUL_S … #define VREV … typedef float32x4_t f4; static int have_simd() { /* TODO: detect neon for !MINIMP3_ONLY_SIMD */ return 1; } #else /* SIMD checks... */ #define HAVE_SSE … #define HAVE_SIMD … #ifdef MINIMP3_ONLY_SIMD #error MINIMP3_ONLY_SIMD used, but SSE/NEON not enabled #endif /* MINIMP3_ONLY_SIMD */ #endif /* SIMD checks... */ #else /* !defined(MINIMP3_NO_SIMD) */ #define HAVE_SIMD … #endif /* !defined(MINIMP3_NO_SIMD) */ #if defined(__ARM_ARCH) && (__ARM_ARCH >= 6) && !defined(__aarch64__) && !defined(_M_ARM64) #define HAVE_ARMV6 … static __inline__ __attribute__((always_inline)) int32_t minimp3_clip_int16_arm(int32_t a) { int32_t x = 0; __asm__ ("ssat %0, #16, %1" : "=r"(x) : "r"(a)); return x; } #else #define HAVE_ARMV6 … #endif bs_t; L12_scale_info; L12_subband_alloc_t; L3_gr_info_t; mp3dec_scratch_t; static void bs_init(bs_t *bs, const uint8_t *data, int bytes) { … } static uint32_t get_bits(bs_t *bs, int n) { … } static int hdr_valid(const uint8_t *h) { … } static int hdr_compare(const uint8_t *h1, const uint8_t *h2) { … } static unsigned hdr_bitrate_kbps(const uint8_t *h) { … } static unsigned hdr_sample_rate_hz(const uint8_t *h) { … } static unsigned hdr_frame_samples(const uint8_t *h) { … } static int hdr_frame_bytes(const uint8_t *h, int free_format_size) { … } static int hdr_padding(const uint8_t *h) { … } #ifndef MINIMP3_ONLY_MP3 static const L12_subband_alloc_t *L12_subband_alloc_table(const uint8_t *hdr, L12_scale_info *sci) { const L12_subband_alloc_t *alloc; int mode = HDR_GET_STEREO_MODE(hdr); int nbands, stereo_bands = (mode == MODE_MONO) ? 0 : (mode == MODE_JOINT_STEREO) ? (HDR_GET_STEREO_MODE_EXT(hdr) << 2) + 4 : 32; if (HDR_IS_LAYER_1(hdr)) { static const L12_subband_alloc_t g_alloc_L1[] = { { 76, 4, 32 } }; alloc = g_alloc_L1; nbands = 32; } else if (!HDR_TEST_MPEG1(hdr)) { static const L12_subband_alloc_t g_alloc_L2M2[] = { { 60, 4, 4 }, { 44, 3, 7 }, { 44, 2, 19 } }; alloc = g_alloc_L2M2; nbands = 30; } else { static const L12_subband_alloc_t g_alloc_L2M1[] = { { 0, 4, 3 }, { 16, 4, 8 }, { 32, 3, 12 }, { 40, 2, 7 } }; int sample_rate_idx = HDR_GET_SAMPLE_RATE(hdr); unsigned kbps = hdr_bitrate_kbps(hdr) >> (int)(mode != MODE_MONO); if (!kbps) /* free-format */ { kbps = 192; } alloc = g_alloc_L2M1; nbands = 27; if (kbps < 56) { static const L12_subband_alloc_t g_alloc_L2M1_lowrate[] = { { 44, 4, 2 }, { 44, 3, 10 } }; alloc = g_alloc_L2M1_lowrate; nbands = sample_rate_idx == 2 ? 12 : 8; } else if (kbps >= 96 && sample_rate_idx != 1) { nbands = 30; } } sci->total_bands = (uint8_t)nbands; sci->stereo_bands = (uint8_t)MINIMP3_MIN(stereo_bands, nbands); return alloc; } static void L12_read_scalefactors(bs_t *bs, uint8_t *pba, uint8_t *scfcod, int bands, float *scf) { static const float g_deq_L12[18*3] = { #define DQ … DQ(3),DQ(7),DQ(15),DQ(31),DQ(63),DQ(127),DQ(255),DQ(511),DQ(1023),DQ(2047),DQ(4095),DQ(8191),DQ(16383),DQ(32767),DQ(65535),DQ(3),DQ(5),DQ(9) }; int i, m; for (i = 0; i < bands; i++) { float s = 0; int ba = *pba++; int mask = ba ? 4 + ((19 >> scfcod[i]) & 3) : 0; for (m = 4; m; m >>= 1) { if (mask & m) { int b = get_bits(bs, 6); s = g_deq_L12[ba*3 - 6 + b % 3]*(1 << 21 >> b/3); } *scf++ = s; } } } static void L12_read_scale_info(const uint8_t *hdr, bs_t *bs, L12_scale_info *sci) { static const uint8_t g_bitalloc_code_tab[] = { 0,17, 3, 4, 5,6,7, 8,9,10,11,12,13,14,15,16, 0,17,18, 3,19,4,5, 6,7, 8, 9,10,11,12,13,16, 0,17,18, 3,19,4,5,16, 0,17,18,16, 0,17,18,19, 4,5,6, 7,8, 9,10,11,12,13,14,15, 0,17,18, 3,19,4,5, 6,7, 8, 9,10,11,12,13,14, 0, 2, 3, 4, 5,6,7, 8,9,10,11,12,13,14,15,16 }; const L12_subband_alloc_t *subband_alloc = L12_subband_alloc_table(hdr, sci); int i, k = 0, ba_bits = 0; const uint8_t *ba_code_tab = g_bitalloc_code_tab; for (i = 0; i < sci->total_bands; i++) { uint8_t ba; if (i == k) { k += subband_alloc->band_count; ba_bits = subband_alloc->code_tab_width; ba_code_tab = g_bitalloc_code_tab + subband_alloc->tab_offset; subband_alloc++; } ba = ba_code_tab[get_bits(bs, ba_bits)]; sci->bitalloc[2*i] = ba; if (i < sci->stereo_bands) { ba = ba_code_tab[get_bits(bs, ba_bits)]; } sci->bitalloc[2*i + 1] = sci->stereo_bands ? ba : 0; } for (i = 0; i < 2*sci->total_bands; i++) { sci->scfcod[i] = sci->bitalloc[i] ? HDR_IS_LAYER_1(hdr) ? 2 : get_bits(bs, 2) : 6; } L12_read_scalefactors(bs, sci->bitalloc, sci->scfcod, sci->total_bands*2, sci->scf); for (i = sci->stereo_bands; i < sci->total_bands; i++) { sci->bitalloc[2*i + 1] = 0; } } static int L12_dequantize_granule(float *grbuf, bs_t *bs, L12_scale_info *sci, int group_size) { int i, j, k, choff = 576; for (j = 0; j < 4; j++) { float *dst = grbuf + group_size*j; for (i = 0; i < 2*sci->total_bands; i++) { int ba = sci->bitalloc[i]; if (ba != 0) { if (ba < 17) { int half = (1 << (ba - 1)) - 1; for (k = 0; k < group_size; k++) { dst[k] = (float)((int)get_bits(bs, ba) - half); } } else { unsigned mod = (2 << (ba - 17)) + 1; /* 3, 5, 9 */ unsigned code = get_bits(bs, mod + 2 - (mod >> 3)); /* 5, 7, 10 */ for (k = 0; k < group_size; k++, code /= mod) { dst[k] = (float)((int)(code % mod - mod/2)); } } } dst += choff; choff = 18 - choff; } } return group_size*4; } static void L12_apply_scf_384(L12_scale_info *sci, const float *scf, float *dst) { int i, k; memcpy(dst + 576 + sci->stereo_bands*18, dst + sci->stereo_bands*18, (sci->total_bands - sci->stereo_bands)*18*sizeof(float)); for (i = 0; i < sci->total_bands; i++, dst += 18, scf += 6) { for (k = 0; k < 12; k++) { dst[k + 0] *= scf[0]; dst[k + 576] *= scf[3]; } } } #endif /* MINIMP3_ONLY_MP3 */ static int L3_read_side_info(bs_t *bs, L3_gr_info_t *gr, const uint8_t *hdr) { … } static void L3_read_scalefactors(uint8_t *scf, uint8_t *ist_pos, const uint8_t *scf_size, const uint8_t *scf_count, bs_t *bitbuf, int scfsi) { … } static float L3_ldexp_q2(float y, int exp_q2) { … } static void L3_decode_scalefactors(const uint8_t *hdr, uint8_t *ist_pos, bs_t *bs, const L3_gr_info_t *gr, float *scf, int ch) { … } static const float g_pow43[129 + 16] = …; static float L3_pow_43(int x) { … } static void L3_huffman(float *dst, bs_t *bs, const L3_gr_info_t *gr_info, const float *scf, int layer3gr_limit) { … } static void L3_midside_stereo(float *left, int n) { … } static void L3_intensity_stereo_band(float *left, int n, float kl, float kr) { … } static void L3_stereo_top_band(const float *right, const uint8_t *sfb, int nbands, int max_band[3]) { … } static void L3_stereo_process(float *left, const uint8_t *ist_pos, const uint8_t *sfb, const uint8_t *hdr, int max_band[3], int mpeg2_sh) { … } static void L3_intensity_stereo(float *left, uint8_t *ist_pos, const L3_gr_info_t *gr, const uint8_t *hdr) { … } static void L3_reorder(float *grbuf, float *scratch, const uint8_t *sfb) { … } static void L3_antialias(float *grbuf, int nbands) { … } static void L3_dct3_9(float *y) { … } static void L3_imdct36(float *grbuf, float *overlap, const float *window, int nbands) { … } static void L3_idct3(float x0, float x1, float x2, float *dst) { … } static void L3_imdct12(float *x, float *dst, float *overlap) { … } static void L3_imdct_short(float *grbuf, float *overlap, int nbands) { … } static void L3_change_sign(float *grbuf) { … } static void L3_imdct_gr(float *grbuf, float *overlap, unsigned block_type, unsigned n_long_bands) { … } static void L3_save_reservoir(mp3dec_t *h, mp3dec_scratch_t *s) { … } static int L3_restore_reservoir(mp3dec_t *h, bs_t *bs, mp3dec_scratch_t *s, int main_data_begin) { … } static void L3_decode(mp3dec_t *h, mp3dec_scratch_t *s, L3_gr_info_t *gr_info, int nch) { … } static void mp3d_DCT_II(float *grbuf, int n) { … } #ifndef MINIMP3_FLOAT_OUTPUT static int16_t mp3d_scale_pcm(float sample) { #if HAVE_ARMV6 int32_t s32 = (int32_t)(sample + .5f); s32 -= (s32 < 0); int16_t s = (int16_t)minimp3_clip_int16_arm(s32); #else if (sample >= 32766.5) return (int16_t) 32767; if (sample <= -32767.5) return (int16_t)-32768; int16_t s = (int16_t)(sample + .5f); s -= (s < 0); /* away from zero, to be compliant */ #endif return s; } #else /* MINIMP3_FLOAT_OUTPUT */ static float mp3d_scale_pcm(float sample) { … } #endif /* MINIMP3_FLOAT_OUTPUT */ static void mp3d_synth_pair(mp3d_sample_t *pcm, int nch, const float *z) { … } static void mp3d_synth(float *xl, mp3d_sample_t *dstl, int nch, float *lins) { … } static void mp3d_synth_granule(float *qmf_state, float *grbuf, int nbands, int nch, mp3d_sample_t *pcm, float *lins) { … } static int mp3d_match_frame(const uint8_t *hdr, int mp3_bytes, int frame_bytes) { … } static int mp3d_find_frame(const uint8_t *mp3, int mp3_bytes, int *free_format_bytes, int *ptr_frame_bytes) { … } void mp3dec_init(mp3dec_t *dec) { … } int mp3dec_decode_frame(mp3dec_t *dec, const uint8_t *mp3, int mp3_bytes, mp3d_sample_t *pcm, mp3dec_frame_info_t *info) { … } #ifdef MINIMP3_FLOAT_OUTPUT void mp3dec_f32_to_s16(const float *in, int16_t *out, int num_samples) { … } #endif /* MINIMP3_FLOAT_OUTPUT */ #endif /* MINIMP3_IMPLEMENTATION && !_MINIMP3_IMPLEMENTATION_GUARD */
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