1 /*
2 * NellyMoser audio decoder
3 * Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
4 * 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
5 * 520e17cd55896441042b14df2566a6eb610ed444
6 * Copyright (c) 2007 Loic Minier <lool at dooz.org>
7 * Benjamin Larsson
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
24 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
25 * DEALINGS IN THE SOFTWARE.
26 */
27
28 /**
29 * @file
30 * The 3 alphanumeric copyright notices are md5summed they are from the original
31 * implementors. The original code is available from http://code.google.com/p/nelly2pcm/
32 */
33
38
39 #define BITSTREAM_READER_LE
46
47
59
63 {
64 int i,j;
66 float *aptr, *bptr, *pptr,
val, pval;
68 unsigned char v;
69
71
73 pptr = pows;
76 if (i > 0)
81 *pptr++ = pval;
82 }
83
84 }
85
87
88 for (i = 0; i < 2; i++) {
90
93
95 if (bits[j] <= 0) {
98 aptr[j] *= -1.0;
99 } else {
102 }
103 }
104 memset(&aptr[NELLY_FILL_LEN], 0,
105 (NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
106
110 NELLY_BUF_LEN / 2);
112 }
113 }
114
117
123
127
130
131 /* Generate overlap window */
132 if (!ff_sine_128[127])
134
137
138 return 0;
139 }
140
142 int *got_frame_ptr,
AVPacket *avpkt)
143 {
147 int buf_size = avpkt->
size;
149 int blocks, i, ret;
150 float *samples_flt;
151
153
154 if (blocks <= 0) {
157 }
158
161 buf_size % NELLY_BLOCK_LEN);
162 }
163 /* Normal numbers of blocks for sample rates:
164 * 8000 Hz - 1
165 * 11025 Hz - 2
166 * 16000 Hz - 3
167 * 22050 Hz - 4
168 * 44100 Hz - 8
169 */
170 if(side && blocks>1 && avctx->
sample_rate%11025==0 && (1<<((side[0]>>2)&3)) == blocks)
172
173 /* get output buffer */
176 return ret;
177 samples_flt = (
float *)frame->
data[0];
178
179 for (i=0 ; i<blocks ; i++) {
183 }
184
185 *got_frame_ptr = 1;
186
187 return buf_size;
188 }
189
192
195
196 return 0;
197 }
198
200 .
name =
"nellymoser",
211 };
const char const char void * val
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
This structure describes decoded (raw) audio or video data.
ptrdiff_t const GLvoid * data
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
#define AV_LOG_WARNING
Something somehow does not look correct.
static void skip_bits_long(GetBitContext *s, int n)
static av_cold int init(AVCodecContext *avctx)
const float ff_nelly_dequantization_table[127]
static av_cold int decode_end(AVCodecContext *avctx)
#define NELLY_DETAIL_BITS
const uint16_t ff_nelly_init_table[64]
void(* vector_fmul_window)(float *dst, const float *src0, const float *src1, const float *win, int len)
Overlap/add with window function.
enum AVSampleFormat sample_fmt
audio sample format
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
bitstream reader API header.
static int decode_tag(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
int flags
AV_CODEC_FLAG_*.
const char * name
Name of the codec implementation.
uint64_t channel_layout
Audio channel layout.
AVCodec ff_nellymoser_decoder
audio channel layout utility functions
#define AV_CODEC_FLAG_BITEXACT
Use only bitexact stuff (except (I)DCT).
const uint8_t ff_nelly_band_sizes_table[NELLY_BANDS]
#define NELLY_HEADER_BITS
static void nelly_decode_block(NellyMoserDecodeContext *s, const unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
static av_cold int decode_init(AVCodecContext *avctx)
Libavcodec external API header.
AVSampleFormat
Audio sample formats.
int sample_rate
samples per second
main external API structure.
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
static unsigned int av_lfg_get(AVLFG *c)
Get the next random unsigned 32-bit number using an ALFG.
void(* imdct_half)(struct FFTContext *s, FFTSample *output, const FFTSample *input)
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
av_cold void av_lfg_init(AVLFG *c, unsigned int seed)
av_cold AVFloatDSPContext * avpriv_float_dsp_alloc(int bit_exact)
Allocate a float DSP context.
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
float imdct_buf[2][NELLY_BUF_LEN]
common internal api header.
#define AV_CODEC_CAP_PARAM_CHANGE
Codec supports changed parameters at any point.
int channels
number of audio channels
const int16_t ff_nelly_delta_table[32]
static enum AVSampleFormat sample_fmts[]
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
uint8_t * av_packet_get_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int *size)
Get side information from packet.
#define FFSWAP(type, a, b)
void ff_nelly_get_sample_bits(const float *buf, int *bits)
#define AV_CH_LAYOUT_MONO
The 3 alphanumeric copyright notices are md5summed they are from the original implementors.
This structure stores compressed data.
int nb_samples
number of audio samples (per channel) described by this frame
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
void AAC_RENAME() ff_init_ff_sine_windows(int index)
initialize the specified entry of ff_sine_windows