2002-04-22 12:27:25 +02:00
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/*
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2007-03-03 09:29:03 +01:00
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* A52 decoder using liba52
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2002-05-26 00:45:33 +02:00
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* Copyright (c) 2001 Fabrice Bellard.
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2002-04-22 12:27:25 +02:00
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*
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2006-10-07 17:30:46 +02:00
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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2002-05-26 00:45:33 +02:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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2006-10-07 17:30:46 +02:00
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* version 2.1 of the License, or (at your option) any later version.
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2002-04-22 12:27:25 +02:00
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*
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2006-10-07 17:30:46 +02:00
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* FFmpeg is distributed in the hope that it will be useful,
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2002-04-22 12:27:25 +02:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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2002-05-26 00:45:33 +02:00
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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2002-04-22 12:27:25 +02:00
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*
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2002-05-26 00:45:33 +02:00
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* You should have received a copy of the GNU Lesser General Public
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2006-10-07 17:30:46 +02:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-12 23:43:26 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2002-04-22 12:27:25 +02:00
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*/
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2003-03-06 12:32:04 +01:00
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/**
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* @file a52dec.c
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2007-03-03 09:29:03 +01:00
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* A52 decoder using liba52
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2003-03-06 12:32:04 +01:00
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*/
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2002-04-22 12:27:25 +02:00
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#include "avcodec.h"
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2007-02-11 17:29:00 +01:00
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#include <a52dec/a52.h>
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2007-02-12 11:05:19 +01:00
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#ifdef CONFIG_LIBA52BIN
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2002-04-22 12:27:25 +02:00
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#include <dlfcn.h>
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static const char* liba52name = "liba52.so.0";
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2007-02-12 11:05:19 +01:00
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#endif
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2002-04-22 12:27:25 +02:00
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/**
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* liba52 - Copyright (C) Aaron Holtzman
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* released under the GPL license.
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*/
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typedef struct AC3DecodeState {
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int flags;
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int channels;
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a52_state_t* state;
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sample_t* samples;
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/*
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* virtual method table
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*
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* using this function table so the liba52 doesn't
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* have to be really linked together with ffmpeg
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* and might be linked in runtime - this allows binary
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* distribution of ffmpeg library which doens't depend
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* on liba52 library - but if user has it installed
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* it will be used - user might install such library
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* separately
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*/
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void* handle;
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a52_state_t* (*a52_init)(uint32_t mm_accel);
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sample_t* (*a52_samples)(a52_state_t * state);
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int (*a52_syncinfo)(uint8_t * buf, int * flags,
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2005-12-22 02:10:11 +01:00
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int * sample_rate, int * bit_rate);
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2002-04-22 12:27:25 +02:00
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int (*a52_frame)(a52_state_t * state, uint8_t * buf, int * flags,
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2005-12-22 02:10:11 +01:00
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sample_t * level, sample_t bias);
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2002-04-22 12:27:25 +02:00
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void (*a52_dynrng)(a52_state_t * state,
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2005-12-22 02:10:11 +01:00
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sample_t (* call) (sample_t, void *), void * data);
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2002-04-22 12:27:25 +02:00
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int (*a52_block)(a52_state_t * state);
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void (*a52_free)(a52_state_t * state);
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} AC3DecodeState;
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2007-03-03 09:33:07 +01:00
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#ifdef CONFIG_LIBA52BIN
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2002-04-22 12:27:25 +02:00
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static void* dlsymm(void* handle, const char* symbol)
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{
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void* f = dlsym(handle, symbol);
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if (!f)
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2005-08-26 21:05:44 +02:00
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av_log( NULL, AV_LOG_ERROR, "A52 Decoder - function '%s' can't be resolved\n", symbol);
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2002-04-22 12:27:25 +02:00
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return f;
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}
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2007-03-03 09:33:07 +01:00
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#endif
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2002-04-22 12:27:25 +02:00
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2008-03-21 04:11:20 +01:00
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static av_cold int a52_decode_init(AVCodecContext *avctx)
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2002-04-22 12:27:25 +02:00
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{
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AC3DecodeState *s = avctx->priv_data;
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2007-02-12 11:05:19 +01:00
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#ifdef CONFIG_LIBA52BIN
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2002-04-22 12:27:25 +02:00
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s->handle = dlopen(liba52name, RTLD_LAZY);
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if (!s->handle)
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{
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2005-08-26 21:05:44 +02:00
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av_log( avctx, AV_LOG_ERROR, "A52 library %s could not be opened! \n%s\n", liba52name, dlerror());
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2002-04-22 12:27:25 +02:00
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return -1;
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}
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s->a52_init = (a52_state_t* (*)(uint32_t)) dlsymm(s->handle, "a52_init");
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s->a52_samples = (sample_t* (*)(a52_state_t*)) dlsymm(s->handle, "a52_samples");
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s->a52_syncinfo = (int (*)(uint8_t*, int*, int*, int*)) dlsymm(s->handle, "a52_syncinfo");
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s->a52_frame = (int (*)(a52_state_t*, uint8_t*, int*, sample_t*, sample_t)) dlsymm(s->handle, "a52_frame");
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s->a52_block = (int (*)(a52_state_t*)) dlsymm(s->handle, "a52_block");
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s->a52_free = (void (*)(a52_state_t*)) dlsymm(s->handle, "a52_free");
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if (!s->a52_init || !s->a52_samples || !s->a52_syncinfo
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|| !s->a52_frame || !s->a52_block || !s->a52_free)
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{
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2005-12-22 02:10:11 +01:00
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dlclose(s->handle);
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2002-04-22 12:27:25 +02:00
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return -1;
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}
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2007-02-12 11:05:19 +01:00
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#else
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s->handle = 0;
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s->a52_init = a52_init;
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s->a52_samples = a52_samples;
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s->a52_syncinfo = a52_syncinfo;
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s->a52_frame = a52_frame;
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s->a52_block = a52_block;
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s->a52_free = a52_free;
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#endif
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2002-04-22 12:27:25 +02:00
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s->state = s->a52_init(0); /* later use CPU flags */
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s->samples = s->a52_samples(s->state);
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2008-01-05 17:45:25 +01:00
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/* allow downmixing to stereo or mono */
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if (avctx->channels > 0 && avctx->request_channels > 0 &&
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avctx->request_channels < avctx->channels &&
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avctx->request_channels <= 2) {
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avctx->channels = avctx->request_channels;
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}
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2008-07-31 12:47:31 +02:00
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avctx->sample_fmt = SAMPLE_FMT_S16;
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2002-04-22 12:27:25 +02:00
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return 0;
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}
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2007-08-12 01:17:03 +02:00
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/**** the following function comes from a52dec */
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2003-02-11 17:35:48 +01:00
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static inline void float_to_int (float * _f, int16_t * s16, int nchannels)
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2002-04-22 12:27:25 +02:00
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{
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int i, j, c;
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2005-12-22 02:10:11 +01:00
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int32_t * f = (int32_t *) _f; // XXX assumes IEEE float format
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2002-04-22 12:27:25 +02:00
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j = 0;
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nchannels *= 256;
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for (i = 0; i < 256; i++) {
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2005-12-22 02:10:11 +01:00
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for (c = 0; c < nchannels; c += 256)
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2007-08-12 01:17:03 +02:00
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s16[j++] = av_clip_int16(f[i + c] - 0x43c00000);
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2002-04-22 12:27:25 +02:00
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}
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}
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/**** end */
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#define HEADER_SIZE 7
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static int a52_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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2003-02-11 17:35:48 +01:00
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uint8_t *buf, int buf_size)
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2002-04-22 12:27:25 +02:00
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{
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AC3DecodeState *s = avctx->priv_data;
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int flags, i, len;
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int sample_rate, bit_rate;
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short *out_samples = data;
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float level;
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static const int ac3_channels[8] = {
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2005-12-22 02:10:11 +01:00
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2, 1, 2, 3, 3, 4, 4, 5
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2002-04-22 12:27:25 +02:00
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};
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2007-01-17 00:28:41 +01:00
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*data_size= 0;
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2008-02-13 15:20:22 +01:00
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if (buf_size < HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame, not enough bytes for header\n");
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return -1;
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}
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len = s->a52_syncinfo(buf, &s->flags, &sample_rate, &bit_rate);
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2008-02-13 15:24:34 +01:00
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if (len == 0) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame, no sync byte at begin\n");
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return -1;
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}
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2008-02-13 15:20:22 +01:00
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if (buf_size < len) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame, not enough bytes\n");
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return -1;
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}
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2008-02-13 15:24:34 +01:00
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/* update codec info */
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avctx->sample_rate = sample_rate;
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s->channels = ac3_channels[s->flags & 7];
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if (s->flags & A52_LFE)
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s->channels++;
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if (avctx->request_channels > 0 &&
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avctx->request_channels <= 2 &&
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avctx->request_channels < s->channels) {
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avctx->channels = avctx->request_channels;
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} else {
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avctx->channels = s->channels;
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}
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avctx->bit_rate = bit_rate;
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flags = s->flags;
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if (avctx->channels == 1)
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flags = A52_MONO;
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else if (avctx->channels == 2)
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flags = A52_STEREO;
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else
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flags |= A52_ADJUST_LEVEL;
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level = 1;
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if (s->a52_frame(s->state, buf, &flags, &level, 384)) {
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fail:
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av_log(avctx, AV_LOG_ERROR, "Error decoding frame\n");
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return -1;
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}
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for (i = 0; i < 6; i++) {
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if (s->a52_block(s->state))
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goto fail;
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float_to_int(s->samples, out_samples + i * 256 * avctx->channels, avctx->channels);
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}
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*data_size = 6 * avctx->channels * 256 * sizeof(int16_t);
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2008-02-13 15:20:22 +01:00
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return len;
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2002-04-22 12:27:25 +02:00
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}
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2008-03-21 04:11:20 +01:00
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static av_cold int a52_decode_end(AVCodecContext *avctx)
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2002-04-22 12:27:25 +02:00
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{
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AC3DecodeState *s = avctx->priv_data;
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s->a52_free(s->state);
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2007-02-12 11:05:19 +01:00
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#ifdef CONFIG_LIBA52BIN
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2002-04-22 12:27:25 +02:00
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dlclose(s->handle);
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2007-02-12 11:05:19 +01:00
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#endif
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2002-04-22 12:27:25 +02:00
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return 0;
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}
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2007-02-11 20:02:59 +01:00
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AVCodec liba52_decoder = {
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2007-06-06 10:41:45 +02:00
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"liba52",
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2002-04-22 12:27:25 +02:00
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CODEC_TYPE_AUDIO,
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CODEC_ID_AC3,
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sizeof(AC3DecodeState),
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a52_decode_init,
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NULL,
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a52_decode_end,
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a52_decode_frame,
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2008-06-12 23:50:13 +02:00
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.long_name = NULL_IF_CONFIG_SMALL("liba52 ATSC A/52 / AC-3"),
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2002-04-22 12:27:25 +02:00
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};
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