FFmpeg  4.3
ac3dec_fixed.c
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1 /*
2  * Copyright (c) 2012
3  * MIPS Technologies, Inc., California.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
14  * contributors may be used to endorse or promote products derived from
15  * this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * Author: Stanislav Ocovaj (socovaj@mips.com)
30  *
31  * AC3 fixed-point decoder for MIPS platforms
32  *
33  * This file is part of FFmpeg.
34  *
35  * FFmpeg is free software; you can redistribute it and/or
36  * modify it under the terms of the GNU Lesser General Public
37  * License as published by the Free Software Foundation; either
38  * version 2.1 of the License, or (at your option) any later version.
39  *
40  * FFmpeg is distributed in the hope that it will be useful,
41  * but WITHOUT ANY WARRANTY; without even the implied warranty of
42  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
43  * Lesser General Public License for more details.
44  *
45  * You should have received a copy of the GNU Lesser General Public
46  * License along with FFmpeg; if not, write to the Free Software
47  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
48  */
49 
50 #define FFT_FLOAT 0
51 #define USE_FIXED 1
52 #define FFT_FIXED_32 1
53 #include "ac3dec.h"
54 
55 
56 static const int end_freq_inv_tab[8] =
57 {
58  50529027, 44278013, 39403370, 32292987, 27356480, 23729101, 20951060, 18755316
59 };
60 
61 static void scale_coefs (
62  int32_t *dst,
63  const int32_t *src,
64  int dynrng,
65  int len)
66 {
67  int i, shift;
68  unsigned mul, round;
69  int temp, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
70 
71  mul = (dynrng & 0x1f) + 0x20;
72  shift = 4 - (sign_extend(dynrng, 9) >> 5);
73  if (shift > 0 ) {
74  round = 1 << (shift-1);
75  for (i=0; i<len; i+=8) {
76 
77  temp = src[i] * mul;
78  temp1 = src[i+1] * mul;
79  temp = temp + round;
80  temp2 = src[i+2] * mul;
81 
82  temp1 = temp1 + round;
83  dst[i] = temp >> shift;
84  temp3 = src[i+3] * mul;
85  temp2 = temp2 + round;
86 
87  dst[i+1] = temp1 >> shift;
88  temp4 = src[i + 4] * mul;
89  temp3 = temp3 + round;
90  dst[i+2] = temp2 >> shift;
91 
92  temp5 = src[i+5] * mul;
93  temp4 = temp4 + round;
94  dst[i+3] = temp3 >> shift;
95  temp6 = src[i+6] * mul;
96 
97  dst[i+4] = temp4 >> shift;
98  temp5 = temp5 + round;
99  temp7 = src[i+7] * mul;
100  temp6 = temp6 + round;
101 
102  dst[i+5] = temp5 >> shift;
103  temp7 = temp7 + round;
104  dst[i+6] = temp6 >> shift;
105  dst[i+7] = temp7 >> shift;
106 
107  }
108  } else {
109  shift = -shift;
110  mul <<= shift;
111  for (i=0; i<len; i+=8) {
112 
113  dst[i] = src[i ] * mul;
114  dst[i+1] = src[i+1] * mul;
115  dst[i+2] = src[i+2] * mul;
116  dst[i+3] = src[i+3] * mul;
117  dst[i+4] = src[i+4] * mul;
118  dst[i+5] = src[i+5] * mul;
119  dst[i+6] = src[i+6] * mul;
120  dst[i+7] = src[i+7] * mul;
121  }
122  }
123 }
124 
125 /**
126  * Downmix samples from original signal to stereo or mono (this is for 16-bit samples
127  * and fixed point decoder - original (for 32-bit samples) is in ac3dsp.c).
128  */
129 static void ac3_downmix_c_fixed16(int16_t **samples, int16_t **matrix,
130  int out_ch, int in_ch, int len)
131 {
132  int i, j;
133  int v0, v1;
134  if (out_ch == 2) {
135  for (i = 0; i < len; i++) {
136  v0 = v1 = 0;
137  for (j = 0; j < in_ch; j++) {
138  v0 += samples[j][i] * matrix[0][j];
139  v1 += samples[j][i] * matrix[1][j];
140  }
141  samples[0][i] = (v0+2048)>>12;
142  samples[1][i] = (v1+2048)>>12;
143  }
144  } else if (out_ch == 1) {
145  for (i = 0; i < len; i++) {
146  v0 = 0;
147  for (j = 0; j < in_ch; j++)
148  v0 += samples[j][i] * matrix[0][j];
149  samples[0][i] = (v0+2048)>>12;
150  }
151  }
152 }
153 
154 #include "eac3dec.c"
155 #include "ac3dec.c"
156 
157 static const AVOption options[] = {
158  { "cons_noisegen", "enable consistent noise generation", OFFSET(consistent_noise_generation), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
159  { "drc_scale", "percentage of dynamic range compression to apply", OFFSET(drc_scale), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 6.0, PAR },
160  { "heavy_compr", "enable heavy dynamic range compression", OFFSET(heavy_compression), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, PAR },
161  { NULL},
162 };
163 
164 static const AVClass ac3_decoder_class = {
165  .class_name = "Fixed-Point AC-3 Decoder",
166  .item_name = av_default_item_name,
167  .option = options,
168  .version = LIBAVUTIL_VERSION_INT,
169 };
170 
172  .name = "ac3_fixed",
173  .type = AVMEDIA_TYPE_AUDIO,
174  .id = AV_CODEC_ID_AC3,
175  .priv_data_size = sizeof (AC3DecodeContext),
177  .close = ac3_decode_end,
179  .capabilities = AV_CODEC_CAP_DR1,
180  .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
181  .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
183  .priv_class = &ac3_decoder_class,
184 };
AVCodec
AVCodec.
Definition: codec.h:190
AV_CODEC_ID_AC3
@ AV_CODEC_ID_AC3
Definition: codec_id.h:413
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
ac3_decoder_class
static const AVClass ac3_decoder_class
Definition: ac3dec_fixed.c:164
AVOption
AVOption.
Definition: opt.h:246
samples
FFmpeg Automated Testing Environment ************************************Introduction Using FATE from your FFmpeg source directory Submitting the results to the FFmpeg result aggregation server Uploading new samples to the fate suite FATE makefile targets and variables Makefile targets Makefile variables Examples Introduction **************FATE is an extended regression suite on the client side and a means for results aggregation and presentation on the server side The first part of this document explains how you can use FATE from your FFmpeg source directory to test your ffmpeg binary The second part describes how you can run FATE to submit the results to FFmpeg’s FATE server In any way you can have a look at the publicly viewable FATE results by visiting this as it can be seen if some test on some platform broke with their recent contribution This usually happens on the platforms the developers could not test on The second part of this document describes how you can run FATE to submit your results to FFmpeg’s FATE server If you want to submit your results be sure to check that your combination of OS and compiler is not already listed on the above mentioned website In the third part you can find a comprehensive listing of FATE makefile targets and variables Using FATE from your FFmpeg source directory **********************************************If you want to run FATE on your machine you need to have the samples in place You can get the samples via the build target fate rsync Use this command from the top level source this will cause FATE to fail NOTE To use a custom wrapper to run the pass ‘ target exec’ to ‘configure’ or set the TARGET_EXEC Make variable Submitting the results to the FFmpeg result aggregation server ****************************************************************To submit your results to the server you should run fate through the shell script ‘tests fate sh’ from the FFmpeg sources This script needs to be invoked with a configuration file as its first argument tests fate sh path to fate_config A configuration file template with comments describing the individual configuration variables can be found at ‘doc fate_config sh template’ Create a configuration that suits your based on the configuration template The ‘slot’ configuration variable can be any string that is not yet but it is suggested that you name it adhering to the following pattern ‘ARCH OS COMPILER COMPILER VERSION’ The configuration file itself will be sourced in a shell therefore all shell features may be used This enables you to setup the environment as you need it for your build For your first test runs the ‘fate_recv’ variable should be empty or commented out This will run everything as normal except that it will omit the submission of the results to the server The following files should be present in $workdir as specified in the configuration it may help to try out the ‘ssh’ command with one or more ‘ v’ options You should get detailed output concerning your SSH configuration and the authentication process The only thing left is to automate the execution of the fate sh script and the synchronisation of the samples directory Uploading new samples to the fate suite *****************************************If you need a sample uploaded send a mail to samples request This is for developers who have an account on the fate suite server If you upload new samples
Definition: fate.txt:139
v0
#define v0
Definition: regdef.h:26
ac3dec.h
scale_coefs
static void scale_coefs(int32_t *dst, const int32_t *src, int dynrng, int len)
Definition: ac3dec_fixed.c:61
ac3dec.c
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
ac3_decode_init
static av_cold int ac3_decode_init(AVCodecContext *avctx)
AVCodec initialization.
Definition: ac3dec.c:184
int32_t
int32_t
Definition: audio_convert.c:194
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
NULL
#define NULL
Definition: coverity.c:32
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
src
#define src
Definition: vp8dsp.c:254
eac3dec.c
ff_ac3_fixed_decoder
AVCodec ff_ac3_fixed_decoder
Definition: ac3dec_fixed.c:171
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:186
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
end_freq_inv_tab
static const int end_freq_inv_tab[8]
Definition: ac3dec_fixed.c:56
AV_SAMPLE_FMT_S16P
@ AV_SAMPLE_FMT_S16P
signed 16 bits, planar
Definition: samplefmt.h:67
AV_OPT_TYPE_FLOAT
@ AV_OPT_TYPE_FLOAT
Definition: opt.h:226
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
round
static av_always_inline av_const double round(double x)
Definition: libm.h:444
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
ac3_decode_end
static av_cold int ac3_decode_end(AVCodecContext *avctx)
Uninitialize the AC-3 decoder.
Definition: ac3dec.c:1831
options
static const AVOption options[]
Definition: ac3dec_fixed.c:157
ac3_downmix_c_fixed16
static void ac3_downmix_c_fixed16(int16_t **samples, int16_t **matrix, int out_ch, int in_ch, int len)
Downmix samples from original signal to stereo or mono (this is for 16-bit samples and fixed point de...
Definition: ac3dec_fixed.c:129
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:197
len
int len
Definition: vorbis_enc_data.h:452
AVClass::class_name
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
OFFSET
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your see the OFFSET() macro
sign_extend
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
temp
else temp
Definition: vf_mcdeint.c:256
shift
static int shift(int a, int b)
Definition: sonic.c:82
AV_OPT_TYPE_BOOL
@ AV_OPT_TYPE_BOOL
Definition: opt.h:240
PAR
@ PAR
Definition: af_afade.c:54
ac3_decode_frame
static int ac3_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Decode a single AC-3 frame.
Definition: ac3dec.c:1462