2005-03-06 00:43:55 +00:00
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/*
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* ALAC (Apple Lossless Audio Codec) decoder
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* Copyright (c) 2005 David Hammerton
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*
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2011-03-18 17:35:10 +00:00
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* This file is part of Libav.
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2006-10-07 15:30:46 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is free software; you can redistribute it and/or
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2005-03-06 00:43:55 +00:00
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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 15:30:46 +00:00
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* version 2.1 of the License, or (at your option) any later version.
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2005-03-06 00:43:55 +00:00
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*
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2011-03-18 17:35:10 +00:00
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* Libav is distributed in the hope that it will be useful,
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2005-03-06 00:43:55 +00:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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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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*
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* You should have received a copy of the GNU Lesser General Public
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2011-03-18 17:35:10 +00:00
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* License along with Libav; if not, write to the Free Software
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2006-01-12 22:43:26 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2005-03-06 00:43:55 +00:00
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*/
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/**
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2010-04-20 14:45:34 +00:00
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* @file
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2005-03-06 00:43:55 +00:00
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* ALAC (Apple Lossless Audio Codec) decoder
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* @author 2005 David Hammerton
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2011-07-14 01:56:07 +00:00
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* @see http://crazney.net/programs/itunes/alac.html
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2005-03-06 00:43:55 +00:00
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*
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2011-12-07 16:55:24 +00:00
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* Note: This decoder expects a 36-byte QuickTime atom to be
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2005-03-06 00:43:55 +00:00
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* passed through the extradata[_size] fields. This atom is tacked onto
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* the end of an 'alac' stsd atom and has the following format:
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2006-02-21 00:03:10 +00:00
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*
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2011-12-07 16:55:24 +00:00
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* 32bit atom size
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* 32bit tag ("alac")
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* 32bit tag version (0)
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* 32bit samples per frame (used when not set explicitly in the frames)
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* 8bit compatible version (0)
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2006-02-21 00:03:10 +00:00
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* 8bit sample size
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2011-12-07 16:55:24 +00:00
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* 8bit history mult (40)
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* 8bit initial history (14)
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2012-07-09 14:23:47 +00:00
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* 8bit rice param limit (10)
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2011-12-07 16:55:24 +00:00
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* 8bit channels
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* 16bit maxRun (255)
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* 32bit max coded frame size (0 means unknown)
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* 32bit average bitrate (0 means unknown)
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2006-02-21 00:03:10 +00:00
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* 32bit samplerate
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2005-03-06 00:43:55 +00:00
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*/
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2012-11-10 15:00:00 +00:00
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#include "libavutil/channel_layout.h"
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2005-03-06 00:43:55 +00:00
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#include "avcodec.h"
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2009-04-13 16:20:26 +00:00
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#include "get_bits.h"
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2007-07-10 17:50:44 +00:00
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#include "bytestream.h"
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2012-11-10 12:22:56 +00:00
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#include "internal.h"
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2007-09-01 21:03:17 +00:00
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#include "unary.h"
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2009-03-03 01:53:54 +00:00
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#include "mathops.h"
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2012-12-04 18:46:20 +00:00
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#include "alac_data.h"
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2005-03-06 00:43:55 +00:00
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#define ALAC_EXTRADATA_SIZE 36
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2005-03-10 05:34:10 +00:00
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typedef struct {
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AVCodecContext *avctx;
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GetBitContext gb;
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2012-07-09 14:23:47 +00:00
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int channels;
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2005-03-06 00:43:55 +00:00
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2012-07-09 20:29:49 +00:00
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int32_t *predict_error_buffer[2];
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int32_t *output_samples_buffer[2];
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int32_t *extra_bits_buffer[2];
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2010-02-04 16:21:26 +00:00
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2012-07-09 14:23:47 +00:00
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uint32_t max_samples_per_frame;
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uint8_t sample_size;
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uint8_t rice_history_mult;
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uint8_t rice_initial_history;
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uint8_t rice_limit;
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2005-03-06 00:43:55 +00:00
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2012-07-09 21:02:42 +00:00
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int extra_bits; /**< number of extra bits beyond 16-bit */
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int nb_samples; /**< number of samples in the current frame */
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2005-03-06 00:43:55 +00:00
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} ALACContext;
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2012-07-09 20:52:19 +00:00
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static inline unsigned int decode_scalar(GetBitContext *gb, int k, int bps)
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2012-07-09 14:33:28 +00:00
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{
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2012-07-09 19:38:58 +00:00
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unsigned int x = get_unary_0_9(gb);
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2008-04-17 03:21:15 +00:00
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if (x > 8) { /* RICE THRESHOLD */
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/* use alternative encoding */
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2012-07-09 20:52:19 +00:00
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x = get_bits_long(gb, bps);
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2012-07-09 14:33:28 +00:00
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} else if (k != 1) {
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2012-07-09 14:34:11 +00:00
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int extrabits = show_bits(gb, k);
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2008-04-17 03:08:25 +00:00
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2012-07-09 14:34:11 +00:00
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/* multiply x by 2^k - 1, as part of their strange algorithm */
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x = (x << k) - x;
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2008-04-17 03:08:25 +00:00
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2012-07-09 14:34:11 +00:00
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if (extrabits > 1) {
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x += extrabits - 1;
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skip_bits(gb, k);
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} else
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skip_bits(gb, k - 1);
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2008-04-17 03:21:15 +00:00
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}
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2008-04-17 03:08:25 +00:00
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return x;
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}
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2012-07-09 20:52:19 +00:00
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static void rice_decompress(ALACContext *alac, int32_t *output_buffer,
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int nb_samples, int bps, int rice_history_mult)
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2005-03-06 00:43:55 +00:00
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{
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2012-07-09 20:52:19 +00:00
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int i;
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2012-07-09 14:30:40 +00:00
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unsigned int history = alac->rice_initial_history;
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2005-03-06 00:43:55 +00:00
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int sign_modifier = 0;
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2012-07-09 20:52:19 +00:00
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for (i = 0; i < nb_samples; i++) {
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2012-07-09 19:38:58 +00:00
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int k;
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unsigned int x;
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2005-03-06 00:43:55 +00:00
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2012-07-09 21:02:42 +00:00
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/* calculate rice param and decode next value */
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2008-04-17 18:50:31 +00:00
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k = av_log2((history >> 9) + 3);
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2012-07-09 14:33:28 +00:00
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k = FFMIN(k, alac->rice_limit);
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2012-07-09 20:52:19 +00:00
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x = decode_scalar(&alac->gb, k, bps);
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2012-07-09 14:53:28 +00:00
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x += sign_modifier;
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2005-03-06 00:43:55 +00:00
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sign_modifier = 0;
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2012-07-09 20:52:19 +00:00
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output_buffer[i] = (x >> 1) ^ -(x & 1);
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2012-07-09 14:53:28 +00:00
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2012-07-09 21:02:42 +00:00
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/* update the history */
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2012-07-09 14:53:28 +00:00
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if (x > 0xffff)
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2005-03-06 00:43:55 +00:00
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history = 0xffff;
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2012-07-09 14:42:52 +00:00
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else
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2012-07-09 14:53:28 +00:00
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history += x * rice_history_mult -
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((history * rice_history_mult) >> 9);
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2005-03-06 00:43:55 +00:00
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/* special case: there may be compressed blocks of 0 */
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2012-07-09 20:52:19 +00:00
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if ((history < 128) && (i + 1 < nb_samples)) {
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2012-07-09 15:02:48 +00:00
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int block_size;
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2005-03-06 00:43:55 +00:00
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2012-07-09 21:02:42 +00:00
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/* calculate rice param and decode block size */
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k = 7 - av_log2(history) + ((history + 16) >> 6);
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2012-07-09 14:33:28 +00:00
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k = FFMIN(k, alac->rice_limit);
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block_size = decode_scalar(&alac->gb, k, 16);
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2005-03-06 00:43:55 +00:00
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if (block_size > 0) {
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2012-07-09 20:52:19 +00:00
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if (block_size >= nb_samples - i) {
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av_log(alac->avctx, AV_LOG_ERROR,
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"invalid zero block size of %d %d %d\n", block_size,
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nb_samples, i);
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block_size = nb_samples - i - 1;
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2008-05-03 20:56:57 +00:00
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}
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2012-07-09 20:52:19 +00:00
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memset(&output_buffer[i + 1], 0,
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2012-07-09 15:04:56 +00:00
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block_size * sizeof(*output_buffer));
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2012-07-09 20:52:19 +00:00
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i += block_size;
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2005-03-06 00:43:55 +00:00
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}
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2012-07-09 14:57:42 +00:00
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if (block_size <= 0xffff)
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sign_modifier = 1;
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2005-03-06 00:43:55 +00:00
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history = 0;
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}
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}
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}
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2007-08-30 16:04:00 +00:00
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static inline int sign_only(int v)
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{
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return v ? FFSIGN(v) : 0;
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}
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2005-03-06 00:43:55 +00:00
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2012-07-09 20:52:19 +00:00
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static void lpc_prediction(int32_t *error_buffer, int32_t *buffer_out,
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int nb_samples, int bps, int16_t *lpc_coefs,
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int lpc_order, int lpc_quant)
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2005-03-06 00:43:55 +00:00
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{
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int i;
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2012-07-19 18:08:22 +00:00
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int32_t *pred = buffer_out;
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2005-03-06 00:43:55 +00:00
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/* first sample always copies */
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*buffer_out = *error_buffer;
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2012-07-09 20:52:19 +00:00
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if (nb_samples <= 1)
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2012-07-09 17:01:32 +00:00
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return;
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2007-07-18 14:29:14 +00:00
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2012-07-09 20:52:19 +00:00
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if (!lpc_order) {
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2012-07-09 15:04:56 +00:00
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memcpy(&buffer_out[1], &error_buffer[1],
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2012-07-09 20:52:19 +00:00
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(nb_samples - 1) * sizeof(*buffer_out));
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2005-03-06 00:43:55 +00:00
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return;
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}
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2012-07-09 20:52:19 +00:00
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if (lpc_order == 31) {
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2012-07-09 14:10:02 +00:00
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/* simple 1st-order prediction */
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2012-07-09 20:52:19 +00:00
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for (i = 1; i < nb_samples; i++) {
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2012-07-09 15:12:25 +00:00
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buffer_out[i] = sign_extend(buffer_out[i - 1] + error_buffer[i],
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2012-07-09 20:52:19 +00:00
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bps);
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2005-03-06 00:43:55 +00:00
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}
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return;
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}
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/* read warm-up samples */
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2012-07-19 18:08:22 +00:00
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for (i = 1; i <= lpc_order; i++)
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buffer_out[i] = sign_extend(buffer_out[i - 1] + error_buffer[i], bps);
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2005-03-06 00:43:55 +00:00
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2012-07-09 14:10:02 +00:00
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/* NOTE: 4 and 8 are very common cases that could be optimized. */
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2005-03-06 00:43:55 +00:00
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2012-07-19 18:08:22 +00:00
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for (; i < nb_samples; i++) {
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2012-07-09 15:08:59 +00:00
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int j;
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2012-07-09 15:18:21 +00:00
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int val = 0;
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2012-07-19 18:08:22 +00:00
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int error_val = error_buffer[i];
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2012-07-09 15:33:31 +00:00
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int error_sign;
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2012-07-19 18:08:22 +00:00
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int d = *pred++;
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2012-07-09 15:08:59 +00:00
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2012-07-09 21:02:42 +00:00
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/* LPC prediction */
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for (j = 0; j < lpc_order; j++)
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2012-07-19 18:08:22 +00:00
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val += (pred[j] - d) * lpc_coefs[j];
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2012-07-09 20:52:19 +00:00
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val = (val + (1 << (lpc_quant - 1))) >> lpc_quant;
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2012-07-09 16:57:16 +00:00
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val += d + error_val;
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2012-07-19 18:08:22 +00:00
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buffer_out[i] = sign_extend(val, bps);
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2005-03-06 00:43:55 +00:00
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2012-07-09 15:33:31 +00:00
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/* adapt LPC coefficients */
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error_sign = sign_only(error_val);
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if (error_sign) {
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2012-07-19 18:08:22 +00:00
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for (j = 0; j < lpc_order && error_val * error_sign > 0; j++) {
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2012-07-09 15:18:21 +00:00
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int sign;
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2012-07-19 18:08:22 +00:00
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val = d - pred[j];
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2012-07-09 15:33:31 +00:00
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sign = sign_only(val) * error_sign;
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2012-07-09 20:52:19 +00:00
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lpc_coefs[j] -= sign;
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2012-07-09 15:33:31 +00:00
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val *= sign;
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2012-07-19 18:08:22 +00:00
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error_val -= (val >> lpc_quant) * (j + 1);
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2005-03-06 00:43:55 +00:00
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}
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}
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2012-07-09 15:08:59 +00:00
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}
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2005-03-06 00:43:55 +00:00
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}
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2012-07-09 21:02:42 +00:00
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static void decorrelate_stereo(int32_t *buffer[2], int nb_samples,
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int decorr_shift, int decorr_left_weight)
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2005-03-06 06:22:24 +00:00
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{
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2005-03-06 00:43:55 +00:00
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int i;
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2012-07-09 20:52:19 +00:00
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for (i = 0; i < nb_samples; i++) {
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2011-10-09 17:16:14 +00:00
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int32_t a, b;
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2005-03-06 00:43:55 +00:00
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2011-10-09 17:16:14 +00:00
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a = buffer[0][i];
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b = buffer[1][i];
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2005-03-06 00:43:55 +00:00
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2012-07-09 20:52:19 +00:00
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a -= (b * decorr_left_weight) >> decorr_shift;
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2011-10-09 17:16:14 +00:00
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b += a;
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2005-03-06 00:43:55 +00:00
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2011-10-09 17:16:14 +00:00
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buffer[0][i] = b;
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buffer[1][i] = a;
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2005-03-06 00:43:55 +00:00
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}
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2011-10-09 17:16:14 +00:00
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}
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2012-07-09 21:02:42 +00:00
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static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2],
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2012-07-09 20:52:19 +00:00
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int extra_bits, int channels, int nb_samples)
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2011-10-09 17:27:16 +00:00
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{
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int i, ch;
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2012-07-09 20:52:19 +00:00
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for (ch = 0; ch < channels; ch++)
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for (i = 0; i < nb_samples; i++)
|
2011-10-09 17:27:16 +00:00
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buffer[ch][i] = (buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i];
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}
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|
2012-12-23 21:56:17 +00:00
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static int decode_element(AVCodecContext *avctx, AVFrame *frame, int ch_index,
|
2012-07-09 20:05:53 +00:00
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int channels)
|
2005-03-06 06:22:24 +00:00
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{
|
2005-03-10 05:34:10 +00:00
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ALACContext *alac = avctx->priv_data;
|
2012-07-09 21:02:42 +00:00
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int has_size, bps, is_compressed, decorr_shift, decorr_left_weight, ret;
|
2012-07-09 20:05:53 +00:00
|
|
|
uint32_t output_samples;
|
2012-07-09 21:02:42 +00:00
|
|
|
int i, ch;
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2012-07-09 14:10:02 +00:00
|
|
|
skip_bits(&alac->gb, 4); /* element instance tag */
|
|
|
|
skip_bits(&alac->gb, 12); /* unused header bits */
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2012-07-09 14:10:02 +00:00
|
|
|
/* the number of output samples is stored in the frame */
|
2012-07-09 20:52:19 +00:00
|
|
|
has_size = get_bits1(&alac->gb);
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2011-10-09 17:00:39 +00:00
|
|
|
alac->extra_bits = get_bits(&alac->gb, 2) << 3;
|
2012-07-09 20:52:19 +00:00
|
|
|
bps = alac->sample_size - alac->extra_bits + channels - 1;
|
|
|
|
if (bps > 32) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "bps is unsupported: %d\n", bps);
|
2012-07-09 19:38:58 +00:00
|
|
|
return AVERROR_PATCHWELCOME;
|
|
|
|
}
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2007-07-18 06:27:37 +00:00
|
|
|
/* whether the frame is compressed */
|
2012-07-09 17:05:35 +00:00
|
|
|
is_compressed = !get_bits1(&alac->gb);
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2012-07-09 20:52:19 +00:00
|
|
|
if (has_size)
|
2012-07-09 20:05:53 +00:00
|
|
|
output_samples = get_bits_long(&alac->gb, 32);
|
|
|
|
else
|
|
|
|
output_samples = alac->max_samples_per_frame;
|
|
|
|
if (!output_samples || output_samples > alac->max_samples_per_frame) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "invalid samples per frame: %d\n",
|
|
|
|
output_samples);
|
|
|
|
return AVERROR_INVALIDDATA;
|
2008-05-03 21:06:55 +00:00
|
|
|
}
|
2012-07-09 20:05:53 +00:00
|
|
|
if (!alac->nb_samples) {
|
|
|
|
/* get output buffer */
|
2012-12-23 21:56:17 +00:00
|
|
|
frame->nb_samples = output_samples;
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame)) < 0) {
|
2012-07-09 20:05:53 +00:00
|
|
|
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
} else if (output_samples != alac->nb_samples) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "sample count mismatch: %u != %d\n",
|
|
|
|
output_samples, alac->nb_samples);
|
|
|
|
return AVERROR_INVALIDDATA;
|
2012-07-09 19:18:51 +00:00
|
|
|
}
|
2012-07-09 20:05:53 +00:00
|
|
|
alac->nb_samples = output_samples;
|
2012-07-19 23:47:08 +00:00
|
|
|
if (alac->sample_size > 16) {
|
|
|
|
for (ch = 0; ch < channels; ch++)
|
2012-12-23 21:56:17 +00:00
|
|
|
alac->output_samples_buffer[ch] = (int32_t *)frame->extended_data[ch_index + ch];
|
2012-07-19 23:47:08 +00:00
|
|
|
}
|
2008-05-03 21:06:55 +00:00
|
|
|
|
2012-07-09 17:05:35 +00:00
|
|
|
if (is_compressed) {
|
2012-07-09 20:52:19 +00:00
|
|
|
int16_t lpc_coefs[2][32];
|
|
|
|
int lpc_order[2];
|
2012-07-09 20:29:49 +00:00
|
|
|
int prediction_type[2];
|
2012-07-09 20:52:19 +00:00
|
|
|
int lpc_quant[2];
|
|
|
|
int rice_history_mult[2];
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2012-07-09 20:52:19 +00:00
|
|
|
decorr_shift = get_bits(&alac->gb, 8);
|
|
|
|
decorr_left_weight = get_bits(&alac->gb, 8);
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2011-10-09 18:19:32 +00:00
|
|
|
for (ch = 0; ch < channels; ch++) {
|
2012-07-09 20:52:19 +00:00
|
|
|
prediction_type[ch] = get_bits(&alac->gb, 4);
|
|
|
|
lpc_quant[ch] = get_bits(&alac->gb, 4);
|
|
|
|
rice_history_mult[ch] = get_bits(&alac->gb, 3);
|
|
|
|
lpc_order[ch] = get_bits(&alac->gb, 5);
|
2005-03-06 00:43:55 +00:00
|
|
|
|
|
|
|
/* read the predictor table */
|
2012-07-19 18:08:22 +00:00
|
|
|
for (i = lpc_order[ch] - 1; i >= 0; i--)
|
2012-07-09 20:52:19 +00:00
|
|
|
lpc_coefs[ch][i] = get_sbits(&alac->gb, 16);
|
2007-07-18 06:27:37 +00:00
|
|
|
}
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2011-10-09 17:00:39 +00:00
|
|
|
if (alac->extra_bits) {
|
2012-07-09 17:15:35 +00:00
|
|
|
for (i = 0; i < alac->nb_samples; i++) {
|
2010-02-04 16:21:26 +00:00
|
|
|
for (ch = 0; ch < channels; ch++)
|
2011-10-09 17:00:39 +00:00
|
|
|
alac->extra_bits_buffer[ch][i] = get_bits(&alac->gb, alac->extra_bits);
|
2010-02-04 16:21:26 +00:00
|
|
|
}
|
|
|
|
}
|
2011-10-09 18:19:32 +00:00
|
|
|
for (ch = 0; ch < channels; ch++) {
|
2012-07-09 20:52:19 +00:00
|
|
|
rice_decompress(alac, alac->predict_error_buffer[ch],
|
|
|
|
alac->nb_samples, bps,
|
|
|
|
rice_history_mult[ch] * alac->rice_history_mult / 4);
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2011-12-07 16:56:57 +00:00
|
|
|
/* adaptive FIR filter */
|
|
|
|
if (prediction_type[ch] == 15) {
|
|
|
|
/* Prediction type 15 runs the adaptive FIR twice.
|
|
|
|
* The first pass uses the special-case coef_num = 31, while
|
|
|
|
* the second pass uses the coefs from the bitstream.
|
|
|
|
*
|
|
|
|
* However, this prediction type is not currently used by the
|
|
|
|
* reference encoder.
|
2007-07-18 06:06:21 +00:00
|
|
|
*/
|
2012-07-09 20:52:19 +00:00
|
|
|
lpc_prediction(alac->predict_error_buffer[ch],
|
|
|
|
alac->predict_error_buffer[ch],
|
|
|
|
alac->nb_samples, bps, NULL, 31, 0);
|
2011-12-07 16:56:57 +00:00
|
|
|
} else if (prediction_type[ch] > 0) {
|
|
|
|
av_log(avctx, AV_LOG_WARNING, "unknown prediction type: %i\n",
|
|
|
|
prediction_type[ch]);
|
2005-03-06 00:43:55 +00:00
|
|
|
}
|
2012-07-09 20:52:19 +00:00
|
|
|
lpc_prediction(alac->predict_error_buffer[ch],
|
|
|
|
alac->output_samples_buffer[ch], alac->nb_samples,
|
|
|
|
bps, lpc_coefs[ch], lpc_order[ch], lpc_quant[ch]);
|
2007-07-18 06:27:37 +00:00
|
|
|
}
|
|
|
|
} else {
|
|
|
|
/* not compressed, easy case */
|
2012-07-09 17:15:35 +00:00
|
|
|
for (i = 0; i < alac->nb_samples; i++) {
|
2011-10-09 18:19:32 +00:00
|
|
|
for (ch = 0; ch < channels; ch++) {
|
2012-07-09 21:02:42 +00:00
|
|
|
alac->output_samples_buffer[ch][i] =
|
|
|
|
get_sbits_long(&alac->gb, alac->sample_size);
|
2008-05-11 18:14:30 +00:00
|
|
|
}
|
2010-02-04 16:21:26 +00:00
|
|
|
}
|
2012-07-09 21:02:42 +00:00
|
|
|
alac->extra_bits = 0;
|
2012-07-09 20:52:19 +00:00
|
|
|
decorr_shift = 0;
|
|
|
|
decorr_left_weight = 0;
|
2007-07-18 06:27:37 +00:00
|
|
|
}
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2012-07-09 20:52:19 +00:00
|
|
|
if (channels == 2 && decorr_left_weight) {
|
2012-07-09 17:15:35 +00:00
|
|
|
decorrelate_stereo(alac->output_samples_buffer, alac->nb_samples,
|
2012-07-09 20:52:19 +00:00
|
|
|
decorr_shift, decorr_left_weight);
|
2011-10-09 17:16:14 +00:00
|
|
|
}
|
|
|
|
|
2011-10-09 17:27:16 +00:00
|
|
|
if (alac->extra_bits) {
|
2012-07-09 14:23:47 +00:00
|
|
|
append_extra_bits(alac->output_samples_buffer, alac->extra_bits_buffer,
|
2012-07-09 20:05:53 +00:00
|
|
|
alac->extra_bits, channels, alac->nb_samples);
|
2011-10-09 17:27:16 +00:00
|
|
|
}
|
|
|
|
|
2012-07-09 14:23:47 +00:00
|
|
|
switch(alac->sample_size) {
|
2012-07-09 18:34:41 +00:00
|
|
|
case 16: {
|
2012-07-09 20:05:53 +00:00
|
|
|
for (ch = 0; ch < channels; ch++) {
|
2012-12-23 21:56:17 +00:00
|
|
|
int16_t *outbuffer = (int16_t *)frame->extended_data[ch_index + ch];
|
2012-07-09 19:18:51 +00:00
|
|
|
for (i = 0; i < alac->nb_samples; i++)
|
|
|
|
*outbuffer++ = alac->output_samples_buffer[ch][i];
|
2012-07-09 18:34:41 +00:00
|
|
|
}}
|
2007-07-18 06:27:37 +00:00
|
|
|
break;
|
2012-07-09 18:34:41 +00:00
|
|
|
case 24: {
|
2012-07-09 20:05:53 +00:00
|
|
|
for (ch = 0; ch < channels; ch++) {
|
2012-07-09 19:18:51 +00:00
|
|
|
for (i = 0; i < alac->nb_samples; i++)
|
|
|
|
alac->output_samples_buffer[ch][i] <<= 8;
|
2012-07-09 18:34:41 +00:00
|
|
|
}}
|
2007-07-18 06:27:37 +00:00
|
|
|
break;
|
|
|
|
}
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2012-07-09 20:05:53 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int alac_decode_frame(AVCodecContext *avctx, void *data,
|
|
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
|
|
{
|
|
|
|
ALACContext *alac = avctx->priv_data;
|
2012-12-23 21:56:17 +00:00
|
|
|
AVFrame *frame = data;
|
2012-12-04 18:46:20 +00:00
|
|
|
enum AlacRawDataBlockType element;
|
2012-07-09 20:05:53 +00:00
|
|
|
int channels;
|
2012-07-20 00:04:40 +00:00
|
|
|
int ch, ret, got_end;
|
2012-07-09 20:05:53 +00:00
|
|
|
|
|
|
|
init_get_bits(&alac->gb, avpkt->data, avpkt->size * 8);
|
|
|
|
|
2012-07-20 00:04:40 +00:00
|
|
|
got_end = 0;
|
2012-07-09 20:05:53 +00:00
|
|
|
alac->nb_samples = 0;
|
|
|
|
ch = 0;
|
2012-07-20 00:04:40 +00:00
|
|
|
while (get_bits_left(&alac->gb) >= 3) {
|
2012-07-09 20:05:53 +00:00
|
|
|
element = get_bits(&alac->gb, 3);
|
2012-07-20 00:04:40 +00:00
|
|
|
if (element == TYPE_END) {
|
|
|
|
got_end = 1;
|
2012-07-09 20:05:53 +00:00
|
|
|
break;
|
2012-07-20 00:04:40 +00:00
|
|
|
}
|
2012-07-09 20:05:53 +00:00
|
|
|
if (element > TYPE_CPE && element != TYPE_LFE) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "syntax element unsupported: %d", element);
|
|
|
|
return AVERROR_PATCHWELCOME;
|
|
|
|
}
|
|
|
|
|
|
|
|
channels = (element == TYPE_CPE) ? 2 : 1;
|
|
|
|
if (ch + channels > alac->channels) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "invalid element channel count\n");
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
|
2012-12-23 21:56:17 +00:00
|
|
|
ret = decode_element(avctx, frame,
|
2012-12-04 18:46:20 +00:00
|
|
|
ff_alac_channel_layout_offsets[alac->channels - 1][ch],
|
2012-07-09 20:29:49 +00:00
|
|
|
channels);
|
2012-07-20 00:04:40 +00:00
|
|
|
if (ret < 0 && get_bits_left(&alac->gb))
|
2012-07-09 20:05:53 +00:00
|
|
|
return ret;
|
|
|
|
|
|
|
|
ch += channels;
|
|
|
|
}
|
2012-07-20 00:04:40 +00:00
|
|
|
if (!got_end) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "no end tag found. incomplete packet.\n");
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
2012-07-09 20:05:53 +00:00
|
|
|
|
2012-07-09 21:02:42 +00:00
|
|
|
if (avpkt->size * 8 - get_bits_count(&alac->gb) > 8) {
|
2012-07-09 17:30:03 +00:00
|
|
|
av_log(avctx, AV_LOG_ERROR, "Error : %d bits left\n",
|
|
|
|
avpkt->size * 8 - get_bits_count(&alac->gb));
|
2012-07-09 21:02:42 +00:00
|
|
|
}
|
2008-04-18 08:58:18 +00:00
|
|
|
|
2012-12-23 21:56:17 +00:00
|
|
|
*got_frame_ptr = 1;
|
2011-09-06 16:17:45 +00:00
|
|
|
|
2012-07-09 17:30:03 +00:00
|
|
|
return avpkt->size;
|
2005-03-06 00:43:55 +00:00
|
|
|
}
|
|
|
|
|
2011-10-06 00:14:48 +00:00
|
|
|
static av_cold int alac_decode_close(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
ALACContext *alac = avctx->priv_data;
|
|
|
|
|
2011-10-09 18:21:35 +00:00
|
|
|
int ch;
|
2012-07-09 20:29:49 +00:00
|
|
|
for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) {
|
2012-07-09 14:23:47 +00:00
|
|
|
av_freep(&alac->predict_error_buffer[ch]);
|
2012-07-09 19:18:51 +00:00
|
|
|
if (alac->sample_size == 16)
|
|
|
|
av_freep(&alac->output_samples_buffer[ch]);
|
2011-10-09 18:21:35 +00:00
|
|
|
av_freep(&alac->extra_bits_buffer[ch]);
|
2011-10-06 00:14:48 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int allocate_buffers(ALACContext *alac)
|
|
|
|
{
|
2011-10-09 18:21:35 +00:00
|
|
|
int ch;
|
2012-07-09 20:57:22 +00:00
|
|
|
int buf_size = alac->max_samples_per_frame * sizeof(int32_t);
|
2011-10-06 00:14:48 +00:00
|
|
|
|
2012-07-09 20:57:22 +00:00
|
|
|
for (ch = 0; ch < FFMIN(alac->channels, 2); ch++) {
|
2012-07-09 14:23:47 +00:00
|
|
|
FF_ALLOC_OR_GOTO(alac->avctx, alac->predict_error_buffer[ch],
|
2011-10-10 15:21:07 +00:00
|
|
|
buf_size, buf_alloc_fail);
|
2011-10-06 00:14:48 +00:00
|
|
|
|
2012-07-09 19:18:51 +00:00
|
|
|
if (alac->sample_size == 16) {
|
|
|
|
FF_ALLOC_OR_GOTO(alac->avctx, alac->output_samples_buffer[ch],
|
|
|
|
buf_size, buf_alloc_fail);
|
|
|
|
}
|
2011-10-06 00:14:48 +00:00
|
|
|
|
2011-10-10 15:21:07 +00:00
|
|
|
FF_ALLOC_OR_GOTO(alac->avctx, alac->extra_bits_buffer[ch],
|
|
|
|
buf_size, buf_alloc_fail);
|
2011-10-06 00:14:48 +00:00
|
|
|
}
|
|
|
|
return 0;
|
2011-10-10 15:21:07 +00:00
|
|
|
buf_alloc_fail:
|
|
|
|
alac_decode_close(alac->avctx);
|
|
|
|
return AVERROR(ENOMEM);
|
2011-10-06 00:14:48 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int alac_set_info(ALACContext *alac)
|
|
|
|
{
|
2012-03-25 02:10:40 +00:00
|
|
|
GetByteContext gb;
|
2011-10-06 00:14:48 +00:00
|
|
|
|
2012-03-25 02:10:40 +00:00
|
|
|
bytestream2_init(&gb, alac->avctx->extradata,
|
|
|
|
alac->avctx->extradata_size);
|
2011-10-06 00:14:48 +00:00
|
|
|
|
2012-03-25 02:10:40 +00:00
|
|
|
bytestream2_skipu(&gb, 12); // size:4, alac:4, version:4
|
2011-10-06 00:14:48 +00:00
|
|
|
|
2012-07-09 14:23:47 +00:00
|
|
|
alac->max_samples_per_frame = bytestream2_get_be32u(&gb);
|
2012-07-09 17:23:22 +00:00
|
|
|
if (!alac->max_samples_per_frame || alac->max_samples_per_frame > INT_MAX) {
|
|
|
|
av_log(alac->avctx, AV_LOG_ERROR, "max samples per frame invalid: %u\n",
|
|
|
|
alac->max_samples_per_frame);
|
2012-03-25 02:10:40 +00:00
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
bytestream2_skipu(&gb, 1); // compatible version
|
2012-07-09 14:23:47 +00:00
|
|
|
alac->sample_size = bytestream2_get_byteu(&gb);
|
|
|
|
alac->rice_history_mult = bytestream2_get_byteu(&gb);
|
|
|
|
alac->rice_initial_history = bytestream2_get_byteu(&gb);
|
|
|
|
alac->rice_limit = bytestream2_get_byteu(&gb);
|
|
|
|
alac->channels = bytestream2_get_byteu(&gb);
|
2012-03-25 02:10:40 +00:00
|
|
|
bytestream2_get_be16u(&gb); // maxRun
|
|
|
|
bytestream2_get_be32u(&gb); // max coded frame size
|
|
|
|
bytestream2_get_be32u(&gb); // average bitrate
|
|
|
|
bytestream2_get_be32u(&gb); // samplerate
|
2011-10-06 00:14:48 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-03-21 03:11:20 +00:00
|
|
|
static av_cold int alac_decode_init(AVCodecContext * avctx)
|
2005-03-06 00:43:55 +00:00
|
|
|
{
|
2011-10-06 00:14:48 +00:00
|
|
|
int ret;
|
2005-03-10 05:34:10 +00:00
|
|
|
ALACContext *alac = avctx->priv_data;
|
|
|
|
alac->avctx = avctx;
|
2005-03-06 00:43:55 +00:00
|
|
|
|
2010-10-26 07:20:51 +00:00
|
|
|
/* initialize from the extradata */
|
2012-12-22 06:21:09 +00:00
|
|
|
if (alac->avctx->extradata_size < ALAC_EXTRADATA_SIZE) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "alac: extradata is too small\n");
|
|
|
|
return AVERROR_INVALIDDATA;
|
2010-10-26 07:20:51 +00:00
|
|
|
}
|
|
|
|
if (alac_set_info(alac)) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "alac: set_info failed\n");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2012-07-09 14:23:47 +00:00
|
|
|
switch (alac->sample_size) {
|
2012-07-09 19:18:51 +00:00
|
|
|
case 16: avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
|
2011-10-05 23:43:49 +00:00
|
|
|
break;
|
2012-07-09 18:36:03 +00:00
|
|
|
case 24:
|
2012-07-09 19:18:51 +00:00
|
|
|
case 32: avctx->sample_fmt = AV_SAMPLE_FMT_S32P;
|
2011-10-05 23:43:49 +00:00
|
|
|
break;
|
2011-10-09 18:23:44 +00:00
|
|
|
default: av_log_ask_for_sample(avctx, "Sample depth %d is not supported.\n",
|
2012-07-09 14:23:47 +00:00
|
|
|
alac->sample_size);
|
2011-10-09 18:23:44 +00:00
|
|
|
return AVERROR_PATCHWELCOME;
|
2011-10-05 23:43:49 +00:00
|
|
|
}
|
2012-10-21 23:18:07 +00:00
|
|
|
avctx->bits_per_raw_sample = alac->sample_size;
|
2011-10-05 23:43:49 +00:00
|
|
|
|
2012-07-09 14:23:47 +00:00
|
|
|
if (alac->channels < 1) {
|
2011-10-06 00:07:29 +00:00
|
|
|
av_log(avctx, AV_LOG_WARNING, "Invalid channel count\n");
|
2012-07-09 14:23:47 +00:00
|
|
|
alac->channels = avctx->channels;
|
2011-10-06 00:07:29 +00:00
|
|
|
} else {
|
2012-12-04 18:46:20 +00:00
|
|
|
if (alac->channels > ALAC_MAX_CHANNELS)
|
2012-07-09 14:23:47 +00:00
|
|
|
alac->channels = avctx->channels;
|
2011-10-06 00:07:29 +00:00
|
|
|
else
|
2012-07-09 14:23:47 +00:00
|
|
|
avctx->channels = alac->channels;
|
2011-10-06 00:07:29 +00:00
|
|
|
}
|
2012-12-04 18:46:20 +00:00
|
|
|
if (avctx->channels > ALAC_MAX_CHANNELS) {
|
2011-10-06 00:07:29 +00:00
|
|
|
av_log(avctx, AV_LOG_ERROR, "Unsupported channel count: %d\n",
|
|
|
|
avctx->channels);
|
|
|
|
return AVERROR_PATCHWELCOME;
|
|
|
|
}
|
2012-12-04 18:46:20 +00:00
|
|
|
avctx->channel_layout = ff_alac_channel_layouts[alac->channels - 1];
|
2011-10-06 00:07:29 +00:00
|
|
|
|
2011-10-06 00:14:48 +00:00
|
|
|
if ((ret = allocate_buffers(alac)) < 0) {
|
|
|
|
av_log(avctx, AV_LOG_ERROR, "Error allocating buffers\n");
|
|
|
|
return ret;
|
2007-07-10 14:30:57 +00:00
|
|
|
}
|
2005-03-06 00:43:55 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-01-25 21:40:11 +00:00
|
|
|
AVCodec ff_alac_decoder = {
|
2011-07-17 10:54:31 +00:00
|
|
|
.name = "alac",
|
|
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
2012-08-05 09:11:04 +00:00
|
|
|
.id = AV_CODEC_ID_ALAC,
|
2011-07-17 10:54:31 +00:00
|
|
|
.priv_data_size = sizeof(ALACContext),
|
|
|
|
.init = alac_decode_init,
|
|
|
|
.close = alac_decode_close,
|
|
|
|
.decode = alac_decode_frame,
|
2011-09-06 16:17:45 +00:00
|
|
|
.capabilities = CODEC_CAP_DR1,
|
2012-04-06 16:19:39 +00:00
|
|
|
.long_name = NULL_IF_CONFIG_SMALL("ALAC (Apple Lossless Audio Codec)"),
|
2005-03-06 00:43:55 +00:00
|
|
|
};
|