X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;ds=sidebyside;f=libavcodec%2Fmpegaudio.h;h=b55680100bd78b9bfadf29bb8314e3d767b24311;hb=a0e1c3517a656dd32293f054a339e0ac73328138;hp=94e9f59ef0ec91df0cfd22a8983f3271467e1f27;hpb=84dc2d8afa1fce31c6fe97149ef70ba966500f65;p=ffmpeg diff --git a/libavcodec/mpegaudio.h b/libavcodec/mpegaudio.h index 94e9f59ef0e..b55680100bd 100644 --- a/libavcodec/mpegaudio.h +++ b/libavcodec/mpegaudio.h @@ -1,36 +1,36 @@ /* * copyright (c) 2001 Fabrice Bellard * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * - * FFmpeg is distributed in the hope that it will be useful, + * Libav is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public - * License along with FFmpeg; if not, write to the Free Software + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** - * @file libavcodec/mpegaudio.h + * @file * mpeg audio declarations for both encoder and decoder. */ #ifndef AVCODEC_MPEGAUDIO_H #define AVCODEC_MPEGAUDIO_H -#include "avcodec.h" -#include "get_bits.h" -#include "dsputil.h" +#ifndef CONFIG_FLOAT +# define CONFIG_FLOAT 0 +#endif -#define CONFIG_AUDIO_NONSHORT 0 +#include /* max frame size, in samples */ #define MPA_FRAME_SIZE 1152 @@ -47,137 +47,29 @@ #define MPA_DUAL 2 #define MPA_MONO 3 -/* header + layer + bitrate + freq + lsf/mpeg25 */ -#define SAME_HEADER_MASK \ - (0xffe00000 | (3 << 17) | (0xf << 12) | (3 << 10) | (3 << 19)) - -#define MP3_MASK 0xFFFE0CCF - -#if CONFIG_MPEGAUDIO_HP +#ifndef FRAC_BITS #define FRAC_BITS 23 /* fractional bits for sb_samples and dct */ #define WFRAC_BITS 16 /* fractional bits for window */ -#else -#define FRAC_BITS 15 /* fractional bits for sb_samples and dct */ -#define WFRAC_BITS 14 /* fractional bits for window */ #endif #define FRAC_ONE (1 << FRAC_BITS) #define FIX(a) ((int)((a) * FRAC_ONE)) -#if CONFIG_MPEGAUDIO_HP && CONFIG_AUDIO_NONSHORT -typedef int32_t OUT_INT; -#define OUT_MAX INT32_MAX -#define OUT_MIN INT32_MIN -#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 31) -#define OUT_FMT SAMPLE_FMT_S32 -#else -typedef int16_t OUT_INT; -#define OUT_MAX INT16_MAX -#define OUT_MIN INT16_MIN -#define OUT_SHIFT (WFRAC_BITS + FRAC_BITS - 15) -#define OUT_FMT SAMPLE_FMT_S16 -#endif - -#if FRAC_BITS <= 15 +#if CONFIG_FLOAT +# define INTFLOAT float +typedef float MPA_INT; +typedef float OUT_INT; +#elif FRAC_BITS <= 15 +# define INTFLOAT int typedef int16_t MPA_INT; +typedef int16_t OUT_INT; #else +# define INTFLOAT int typedef int32_t MPA_INT; +typedef int16_t OUT_INT; #endif -#define BACKSTEP_SIZE 512 -#define EXTRABYTES 24 - -/* layer 3 "granule" */ -typedef struct GranuleDef { - uint8_t scfsi; - int part2_3_length; - int big_values; - int global_gain; - int scalefac_compress; - uint8_t block_type; - uint8_t switch_point; - int table_select[3]; - int subblock_gain[3]; - uint8_t scalefac_scale; - uint8_t count1table_select; - int region_size[3]; /* number of huffman codes in each region */ - int preflag; - int short_start, long_end; /* long/short band indexes */ - uint8_t scale_factors[40]; - int32_t sb_hybrid[SBLIMIT * 18]; /* 576 samples */ -} GranuleDef; - -#define MPA_DECODE_HEADER \ - int frame_size; \ - int error_protection; \ - int layer; \ - int sample_rate; \ - int sample_rate_index; /* between 0 and 8 */ \ - int bit_rate; \ - int nb_channels; \ - int mode; \ - int mode_ext; \ - int lsf; - -typedef struct MPADecodeHeader { - MPA_DECODE_HEADER -} MPADecodeHeader; - -typedef struct MPADecodeContext { - MPA_DECODE_HEADER - uint8_t last_buf[2*BACKSTEP_SIZE + EXTRABYTES]; - int last_buf_size; - /* next header (used in free format parsing) */ - uint32_t free_format_next_header; - GetBitContext gb; - GetBitContext in_gb; - DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512 * 2]; - int synth_buf_offset[MPA_MAX_CHANNELS]; - DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][36][SBLIMIT]; - int32_t mdct_buf[MPA_MAX_CHANNELS][SBLIMIT * 18]; /* previous samples, for layer 3 MDCT */ - GranuleDef granules[2][2]; /* Used in Layer 3 */ -#ifdef DEBUG - int frame_count; -#endif - void (*compute_antialias)(struct MPADecodeContext *s, struct GranuleDef *g); - int adu_mode; ///< 0 for standard mp3, 1 for adu formatted mp3 - int dither_state; - int error_recognition; - AVCodecContext* avctx; -} MPADecodeContext; - -/* layer 3 huffman tables */ -typedef struct HuffTable { - int xsize; - const uint8_t *bits; - const uint16_t *codes; -} HuffTable; - int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf); -int ff_mpa_decode_header(AVCodecContext *avctx, uint32_t head, int *sample_rate, int *channels, int *frame_size, int *bitrate); -extern MPA_INT ff_mpa_synth_window[]; -void ff_mpa_synth_init(MPA_INT *window); -void ff_mpa_synth_filter(MPA_INT *synth_buf_ptr, int *synth_buf_offset, - MPA_INT *window, int *dither_state, - OUT_INT *samples, int incr, - int32_t sb_samples[SBLIMIT]); - -/* fast header check for resync */ -static inline int ff_mpa_check_header(uint32_t header){ - /* header */ - if ((header & 0xffe00000) != 0xffe00000) - return -1; - /* layer check */ - if ((header & (3<<17)) == 0) - return -1; - /* bit rate */ - if ((header & (0xf<<12)) == 0xf<<12) - return -1; - /* frequency */ - if ((header & (3<<10)) == 3<<10) - return -1; - return 0; -} #endif /* AVCODEC_MPEGAUDIO_H */