mirror of
https://github.com/FFmpeg/FFmpeg.git
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Nellymoser ASAO decoder
Originally committed as revision 10741 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Benjamin Larsson
parent
85aec3bd48
commit
636b13c5fc
@ -99,6 +99,7 @@ version <next>
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- AMV audio and video decoder
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- AMV audio and video decoder
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- DNxHD encoder
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- DNxHD encoder
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- H.264 PAFF decoding
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- H.264 PAFF decoding
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- Nellymoser ASAO decoder
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version 0.4.9-pre1:
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version 0.4.9-pre1:
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@ -316,6 +316,7 @@ following image formats are supported:
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@item DT$ Coherent Audio @tab @tab X
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@item DT$ Coherent Audio @tab @tab X
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@item ATRAC 3 @tab @tab X
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@item ATRAC 3 @tab @tab X
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@item Monkey's Audio @tab @tab X @tab Only versions 3.97-3.99 are supported
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@item Monkey's Audio @tab @tab X @tab Only versions 3.97-3.99 are supported
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@item Nellymoser ASAO @tab @tab X
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@end multitable
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@end multitable
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@code{X} means that encoding (resp. decoding) is supported.
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@code{X} means that encoding (resp. decoding) is supported.
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@ -128,6 +128,7 @@ OBJS-$(CONFIG_MSMPEG4V3_ENCODER) += msmpeg4.o msmpeg4data.o mpegvideo_enc.
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OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o
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OBJS-$(CONFIG_MSRLE_DECODER) += msrle.o
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OBJS-$(CONFIG_MSVIDEO1_DECODER) += msvideo1.o
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OBJS-$(CONFIG_MSVIDEO1_DECODER) += msvideo1.o
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OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o
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OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o
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OBJS-$(CONFIG_NELLYMOSER_DECODER) += nellymoserdec.o
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OBJS-$(CONFIG_NUV_DECODER) += nuv.o rtjpeg.o
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OBJS-$(CONFIG_NUV_DECODER) += nuv.o rtjpeg.o
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OBJS-$(CONFIG_PAM_ENCODER) += pnmenc.o pnm.o
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OBJS-$(CONFIG_PAM_ENCODER) += pnmenc.o pnm.o
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OBJS-$(CONFIG_PBM_ENCODER) += pnmenc.o pnm.o
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OBJS-$(CONFIG_PBM_ENCODER) += pnmenc.o pnm.o
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@ -199,6 +199,7 @@ void avcodec_register_all(void)
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REGISTER_DECODER (MP3ADU, mp3adu);
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REGISTER_DECODER (MP3ADU, mp3adu);
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REGISTER_DECODER (MP3ON4, mp3on4);
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REGISTER_DECODER (MP3ON4, mp3on4);
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REGISTER_DECODER (MPC7, mpc7);
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REGISTER_DECODER (MPC7, mpc7);
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REGISTER_DECODER (NELLYMOSER, nellymoser);
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REGISTER_DECODER (QDM2, qdm2);
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REGISTER_DECODER (QDM2, qdm2);
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REGISTER_DECODER (RA_144, ra_144);
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REGISTER_DECODER (RA_144, ra_144);
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REGISTER_DECODER (RA_288, ra_288);
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REGISTER_DECODER (RA_288, ra_288);
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@ -33,8 +33,8 @@
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#define AV_STRINGIFY(s) AV_TOSTRING(s)
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#define AV_STRINGIFY(s) AV_TOSTRING(s)
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#define AV_TOSTRING(s) #s
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#define AV_TOSTRING(s) #s
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#define LIBAVCODEC_VERSION_INT ((51<<16)+(45<<8)+0)
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#define LIBAVCODEC_VERSION_INT ((51<<16)+(46<<8)+0)
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#define LIBAVCODEC_VERSION 51.45.0
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#define LIBAVCODEC_VERSION 51.46.0
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#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
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#define LIBAVCODEC_BUILD LIBAVCODEC_VERSION_INT
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#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
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#define LIBAVCODEC_IDENT "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
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@ -264,6 +264,7 @@ enum CodecID {
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CODEC_ID_ATRAC3,
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CODEC_ID_ATRAC3,
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CODEC_ID_VOXWARE,
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CODEC_ID_VOXWARE,
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CODEC_ID_APE,
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CODEC_ID_APE,
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CODEC_ID_NELLYMOSER,
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/* subtitle codecs */
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/* subtitle codecs */
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CODEC_ID_DVD_SUBTITLE= 0x17000,
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CODEC_ID_DVD_SUBTITLE= 0x17000,
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481
libavcodec/nellymoserdec.c
Normal file
481
libavcodec/nellymoserdec.c
Normal file
@ -0,0 +1,481 @@
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/*
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* NellyMoser audio decoder
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* Copyright (c) 2007 a840bda5870ba11f19698ff6eb9581dfb0f95fa5,
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* 539459aeb7d425140b62a3ec7dbf6dc8e408a306, and
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* 520e17cd55896441042b14df2566a6eb610ed444
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* Copyright (c) 2007 Loic Minier <lool at dooz.org>
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* Benjamin Larsson
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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/**
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* @file nellymoserdec.c
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* The 3 alphanumeric copyright notices are md5summed they are from the original
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* implementors. The original code is available from http://code.google.com/p/nelly2pcm/
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*/
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#include "avcodec.h"
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#include "random.h"
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#include "dsputil.h"
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#define ALT_BITSTREAM_READER_LE
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#include "bitstream.h"
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#define NELLY_BANDS 23
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#define NELLY_BLOCK_LEN 64
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#define NELLY_HEADER_BITS 116
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#define NELLY_DETAIL_BITS 198
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#define NELLY_BUF_LEN 128
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#define NELLY_FILL_LEN 124
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#define NELLY_BIT_CAP 6
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#define NELLY_BASE_OFF 4228
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#define NELLY_BASE_SHIFT 19
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#define NELLY_SAMPLES 256
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static const float dequantization_table[127] = {
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0.0000000000,-0.8472560048, 0.7224709988, -1.5247479677, -0.4531480074, 0.3753609955, 1.4717899561,
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-1.9822579622, -1.1929379702, -0.5829370022, -0.0693780035, 0.3909569979,0.9069200158, 1.4862740040,
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2.2215409279, -2.3887870312, -1.8067539930, -1.4105420113, -1.0773609877, -0.7995010018,-0.5558109879,
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-0.3334020078, -0.1324490011, 0.0568020009, 0.2548770010, 0.4773550034, 0.7386850119, 1.0443060398,
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1.3954459429, 1.8098750114, 2.3918759823,-2.3893830776, -1.9884680510, -1.7514040470, -1.5643119812,
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-1.3922129869,-1.2164649963, -1.0469499826, -0.8905100226, -0.7645580173, -0.6454579830, -0.5259280205,
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-0.4059549868, -0.3029719889, -0.2096900046, -0.1239869967, -0.0479229987, 0.0257730000, 0.1001340002,
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0.1737180054, 0.2585540116, 0.3522900045, 0.4569880068, 0.5767750144, 0.7003160119, 0.8425520062,
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1.0093879700, 1.1821349859, 1.3534560204, 1.5320819616, 1.7332619429, 1.9722349644, 2.3978140354,
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-2.5756309032, -2.0573320389, -1.8984919786, -1.7727810144, -1.6662600040, -1.5742180347, -1.4993319511,
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-1.4316639900, -1.3652280569, -1.3000990152, -1.2280930281, -1.1588579416, -1.0921250582, -1.0135740042,
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-0.9202849865, -0.8287050128, -0.7374889851, -0.6447759867, -0.5590940118, -0.4857139885, -0.4110319912,
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-0.3459700048, -0.2851159871, -0.2341620028, -0.1870580018, -0.1442500055, -0.1107169986, -0.0739680007,
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-0.0365610011, -0.0073290002, 0.0203610007, 0.0479039997, 0.0751969963, 0.0980999991, 0.1220389977,
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0.1458999962, 0.1694349945, 0.1970459968, 0.2252430022, 0.2556869984, 0.2870100141, 0.3197099864,
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0.3525829911, 0.3889069855, 0.4334920049, 0.4769459963, 0.5204820037, 0.5644530058, 0.6122040153,
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0.6685929894, 0.7341650128, 0.8032159805, 0.8784040213, 0.9566209912, 1.0397069454, 1.1293770075,
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1.2211159468, 1.3080279827, 1.4024800062, 1.5056819916, 1.6227730513, 1.7724959850, 1.9430880547,
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2.2903931141
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};
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static const uint8_t nelly_band_sizes_table[NELLY_BANDS] = {
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2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 9, 10, 12, 14, 15
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};
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static const uint16_t nelly_init_table[64] = {
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3134, 5342, 6870, 7792, 8569, 9185, 9744, 10191, 10631, 11061, 11434, 11770,
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12116, 12513, 12925, 13300, 13674, 14027, 14352, 14716, 15117, 15477, 15824,
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16157, 16513, 16804, 17090, 17401, 17679, 17948, 18238, 18520, 18764, 19078,
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19381, 19640, 19921, 20205, 20500, 20813, 21162, 21465, 21794, 22137, 22453,
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22756, 23067, 23350, 23636, 23926, 24227, 24521, 24819, 25107, 25414, 25730,
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26120, 26497, 26895, 27344, 27877, 28463, 29426, 31355
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};
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static const int16_t nelly_delta_table[32] = {
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-11725, -9420, -7910, -6801, -5948, -5233, -4599, -4039, -3507, -3030, -2596,
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-2170, -1774, -1383, -1016, -660, -329, -1, 337, 696, 1085, 1512, 1962, 2433,
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2968, 3569, 4314, 5279, 6622, 8154, 10076, 12975
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};
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typedef struct NellyMoserDecodeContext {
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AVCodecContext* avctx;
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float float_buf[NELLY_SAMPLES];
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float state[64];
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AVRandomState random_state;
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GetBitContext gb;
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int add_bias;
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int scale_bias;
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DSPContext dsp;
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FFTContext fftc;
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} NellyMoserDecodeContext;
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DECLARE_ALIGNED_16(float,sine_window[128]);
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DECLARE_ALIGNED_16(float,tcos[64]);
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DECLARE_ALIGNED_16(float,tsin[64]);
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DECLARE_ALIGNED_16(float,cos_tab[64]);
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static inline int signed_shift(int i, int shift) {
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if (shift > 0)
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return i << shift;
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return i >> -shift;
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}
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static void antialias(float *buf, float *audio)
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{
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int i, end, mid_hi, mid_lo;
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end = NELLY_BUF_LEN-1;
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mid_hi = NELLY_BUF_LEN/2;
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mid_lo = mid_hi-1;
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for (i = 0; i < NELLY_BUF_LEN/4; i++) {
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audio[2*i] = buf[2*i ]*tcos[i ] - buf[end-2*i]*tsin[i];
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audio[2*i+1] = -(buf[end-2*i ]*tcos[i ] + buf[2*i ]*tsin[i]);
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audio[end-2*i-1]= buf[end-2*i-1]*tcos[mid_lo-i] - buf[2*i+1 ]*tsin[mid_lo-i];
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audio[end-2*i ]= -(buf[2*i+1 ]*tcos[mid_lo-i] + buf[end-2*i]*tsin[mid_lo-i]);
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}
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}
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static void complex2signal(float *audio)
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{
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int i, end, mid_hi, mid_lo;
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float *aptr, *sigptr, a, b, c, d, e, f, g;
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end = NELLY_BUF_LEN-1;
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mid_hi = NELLY_BUF_LEN/2;
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mid_lo = mid_hi-1;
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a = -audio[end];
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b = audio[end-1];
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c = -audio[1];
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d = cos_tab[0];
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e = audio[0];
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f = cos_tab[mid_lo];
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g = cos_tab[1];
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audio[0] = d*e;
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audio[1] = b*g-a*f;
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audio[end-1] = a*g+b*f;
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audio[end] = c*(-d);
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aptr = audio+end-2;
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sigptr = cos_tab+mid_hi-1;
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for (i = 3; i < NELLY_BUF_LEN/2; i += 2) {
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a = audio[i-1];
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b = -audio[i];
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c = cos_tab[i/2];
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d = *sigptr;
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e = *(aptr-1);
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f = -(*aptr);
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audio[i-1] = a*c+b*d;
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*aptr = a*d-b*c;
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a = cos_tab[(i/2)+1];
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b = *(sigptr-1);
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*(aptr-1) = b*e+a*f;
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audio[i] = a*e-b*f;
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sigptr--;
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aptr -= 2;
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}
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}
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static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio)
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{
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int bot, mid_up, mid_down, top;
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float s_bot, s_top;
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bot = 0;
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top = NELLY_BUF_LEN-1;
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mid_up = NELLY_BUF_LEN/2;
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mid_down = (NELLY_BUF_LEN/2)-1;
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while (bot < NELLY_BUF_LEN/4) {
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s_bot = audio[bot];
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s_top = audio[top];
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audio[bot] = (audio[mid_up]*sine_window[bot]-state[bot ]*sine_window[top])/s->scale_bias + s->add_bias;
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audio[top] = (-state[bot ]*sine_window[bot]-audio[mid_up]*sine_window[top])/s->scale_bias + s->add_bias;
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state[bot] = audio[mid_down];
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audio[mid_down] = (s_top *sine_window[mid_down]-state[mid_down]*sine_window[mid_up])/s->scale_bias + s->add_bias;
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audio[mid_up ] = (-state[mid_down]*sine_window[mid_down]-s_top *sine_window[mid_up])/s->scale_bias + s->add_bias;
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state[mid_down] = s_bot;
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bot++;
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mid_up++;
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mid_down--;
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top--;
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}
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}
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static int sum_bits(short *buf, short shift, short off)
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{
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int b, i = 0, ret = 0;
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for (i = 0; i < NELLY_FILL_LEN; i++) {
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b = buf[i]-off;
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b = ((b>>(shift-1))+1)>>1;
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ret += av_clip(b, 0, NELLY_BIT_CAP);
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}
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return ret;
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}
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static int headroom(int *la)
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{
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int l;
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if (*la == 0) {
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return 31;
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}
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l = 30 - av_log2(FFABS(*la));
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*la <<= l;
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return l;
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}
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static void get_sample_bits(float *buf, int *bits)
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{
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||||||
|
int i, j;
|
||||||
|
short sbuf[128];
|
||||||
|
int bitsum = 0, last_bitsum, small_bitsum, big_bitsum;
|
||||||
|
short shift, shift_saved;
|
||||||
|
int max, sum, last_off, tmp;
|
||||||
|
int big_off, small_off;
|
||||||
|
int off;
|
||||||
|
|
||||||
|
max = 0;
|
||||||
|
for (i = 0; i < NELLY_FILL_LEN; i++) {
|
||||||
|
max = FFMAX(max, buf[i]);
|
||||||
|
}
|
||||||
|
shift = -16;
|
||||||
|
shift += headroom(&max);
|
||||||
|
|
||||||
|
sum = 0;
|
||||||
|
for (i = 0; i < NELLY_FILL_LEN; i++) {
|
||||||
|
sbuf[i] = signed_shift(buf[i], shift);
|
||||||
|
sbuf[i] = (3*sbuf[i])>>2;
|
||||||
|
sum += sbuf[i];
|
||||||
|
}
|
||||||
|
|
||||||
|
shift += 11;
|
||||||
|
shift_saved = shift;
|
||||||
|
sum -= NELLY_DETAIL_BITS << shift;
|
||||||
|
shift += headroom(&sum);
|
||||||
|
small_off = (NELLY_BASE_OFF * (sum>>16)) >> 15;
|
||||||
|
shift = shift_saved - (NELLY_BASE_SHIFT+shift-31);
|
||||||
|
|
||||||
|
small_off = signed_shift(small_off, shift);
|
||||||
|
|
||||||
|
bitsum = sum_bits(sbuf, shift_saved, small_off);
|
||||||
|
|
||||||
|
if (bitsum != NELLY_DETAIL_BITS) {
|
||||||
|
shift = 0;
|
||||||
|
off = bitsum - NELLY_DETAIL_BITS;
|
||||||
|
|
||||||
|
for(shift=0; FFABS(off) <= 16383; shift++)
|
||||||
|
off *= 2;
|
||||||
|
|
||||||
|
off = (off * NELLY_BASE_OFF) >> 15;
|
||||||
|
shift = shift_saved-(NELLY_BASE_SHIFT+shift-15);
|
||||||
|
|
||||||
|
off = signed_shift(off, shift);
|
||||||
|
|
||||||
|
for (j = 1; j < 20; j++) {
|
||||||
|
last_off = small_off;
|
||||||
|
small_off += off;
|
||||||
|
last_bitsum = bitsum;
|
||||||
|
|
||||||
|
bitsum = sum_bits(sbuf, shift_saved, small_off);
|
||||||
|
|
||||||
|
if ((bitsum-NELLY_DETAIL_BITS) * (last_bitsum-NELLY_DETAIL_BITS) <= 0)
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (bitsum > NELLY_DETAIL_BITS) {
|
||||||
|
big_off = small_off;
|
||||||
|
small_off = last_off;
|
||||||
|
big_bitsum=bitsum;
|
||||||
|
small_bitsum=last_bitsum;
|
||||||
|
} else {
|
||||||
|
big_off = last_off;
|
||||||
|
big_bitsum=last_bitsum;
|
||||||
|
small_bitsum=bitsum;
|
||||||
|
}
|
||||||
|
|
||||||
|
while (bitsum != NELLY_DETAIL_BITS && j <= 19) {
|
||||||
|
off = (big_off+small_off)>>1;
|
||||||
|
bitsum = sum_bits(sbuf, shift_saved, off);
|
||||||
|
if (bitsum > NELLY_DETAIL_BITS) {
|
||||||
|
big_off=off;
|
||||||
|
big_bitsum=bitsum;
|
||||||
|
} else {
|
||||||
|
small_off = off;
|
||||||
|
small_bitsum=bitsum;
|
||||||
|
}
|
||||||
|
j++;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (abs(big_bitsum-NELLY_DETAIL_BITS) >=
|
||||||
|
abs(small_bitsum-NELLY_DETAIL_BITS)) {
|
||||||
|
bitsum = small_bitsum;
|
||||||
|
} else {
|
||||||
|
small_off = big_off;
|
||||||
|
bitsum = big_bitsum;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
for (i = 0; i < NELLY_FILL_LEN; i++) {
|
||||||
|
tmp = sbuf[i]-small_off;
|
||||||
|
tmp = ((tmp>>(shift_saved-1))+1)>>1;
|
||||||
|
bits[i] = av_clip(tmp, 0, NELLY_BIT_CAP);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (bitsum > NELLY_DETAIL_BITS) {
|
||||||
|
tmp = i = 0;
|
||||||
|
while (tmp < NELLY_DETAIL_BITS) {
|
||||||
|
tmp += bits[i];
|
||||||
|
i++;
|
||||||
|
}
|
||||||
|
|
||||||
|
bits[i-1] -= tmp - NELLY_DETAIL_BITS;
|
||||||
|
for(; i < NELLY_FILL_LEN; i++)
|
||||||
|
bits[i] = 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void nelly_decode_block(NellyMoserDecodeContext *s, unsigned char block[NELLY_BLOCK_LEN], float audio[NELLY_SAMPLES])
|
||||||
|
{
|
||||||
|
int i,j;
|
||||||
|
float buf[NELLY_BUF_LEN], pows[NELLY_BUF_LEN];
|
||||||
|
float *aptr, *bptr, *pptr, val, pval;
|
||||||
|
int bits[NELLY_BUF_LEN];
|
||||||
|
unsigned char v;
|
||||||
|
|
||||||
|
init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
|
||||||
|
|
||||||
|
bptr = buf;
|
||||||
|
pptr = pows;
|
||||||
|
val = nelly_init_table[get_bits(&s->gb, 6)];
|
||||||
|
for (i=0 ; i<NELLY_BANDS ; i++) {
|
||||||
|
if (i > 0)
|
||||||
|
val += nelly_delta_table[get_bits(&s->gb, 5)];
|
||||||
|
pval = pow(2, val/2048);
|
||||||
|
for (j = 0; j < nelly_band_sizes_table[i]; j++) {
|
||||||
|
*bptr++ = val;
|
||||||
|
*pptr++ = pval;
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
|
|
||||||
|
memset(&buf[NELLY_FILL_LEN],0,4*sizeof(float));
|
||||||
|
memset(&pows[NELLY_FILL_LEN],0,4*sizeof(float));
|
||||||
|
|
||||||
|
get_sample_bits(buf, bits);
|
||||||
|
|
||||||
|
for (i = 0; i < 2; i++) {
|
||||||
|
aptr = audio+i*128;
|
||||||
|
init_get_bits(&s->gb, block, NELLY_BLOCK_LEN * 8);
|
||||||
|
skip_bits(&s->gb, NELLY_HEADER_BITS + i*NELLY_DETAIL_BITS);
|
||||||
|
|
||||||
|
for (j = 0; j < NELLY_FILL_LEN; j++) {
|
||||||
|
if (bits[j] <= 0) {
|
||||||
|
buf[j] = M_SQRT1_2*pows[j];
|
||||||
|
if (av_random(&s->random_state) & 1)
|
||||||
|
buf[j] *= -1.0;
|
||||||
|
} else {
|
||||||
|
v = get_bits(&s->gb, bits[j]);
|
||||||
|
buf[j] = dequantization_table[(1<<bits[j])-1+v]*pows[j];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
antialias(buf, aptr);
|
||||||
|
ff_fft_permute(&s->fftc, (FFTComplex*)aptr);
|
||||||
|
ff_fft_calc(&s->fftc, (FFTComplex*)aptr);
|
||||||
|
complex2signal(aptr);
|
||||||
|
overlap_and_window(s, s->state, aptr);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
static int decode_init(AVCodecContext * avctx) {
|
||||||
|
NellyMoserDecodeContext *s = avctx->priv_data;
|
||||||
|
int i;
|
||||||
|
float alpha;
|
||||||
|
|
||||||
|
s->avctx = avctx;
|
||||||
|
av_init_random(0, &s->random_state);
|
||||||
|
ff_fft_init(&s->fftc, 6, 1);
|
||||||
|
dsputil_init(&s->dsp, avctx);
|
||||||
|
|
||||||
|
if(s->dsp.float_to_int16 == ff_float_to_int16_c) {
|
||||||
|
s->add_bias = 385;
|
||||||
|
s->scale_bias = 32768;
|
||||||
|
} else {
|
||||||
|
s->add_bias = 0;
|
||||||
|
s->scale_bias = 1;
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Generate overlap window */
|
||||||
|
if (!sine_window[0])
|
||||||
|
for (i=0 ; i<128; i++) {
|
||||||
|
sine_window[i] = sin((i + 0.5) / 256.0 * M_PI);
|
||||||
|
}
|
||||||
|
|
||||||
|
/* Generate tables */
|
||||||
|
if (!tcos[0])
|
||||||
|
for(i=0;i<64;i++) {
|
||||||
|
alpha = 2*M_PI * (i + 1.0 / 4.0) / 256;
|
||||||
|
tcos[i] = cos(alpha);
|
||||||
|
tsin[i] = -sin(alpha);
|
||||||
|
cos_tab[i] = cos(i/128.0*M_PI)/8.0;
|
||||||
|
}
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int decode_tag(AVCodecContext * avctx,
|
||||||
|
void *data, int *data_size,
|
||||||
|
uint8_t * buf, int buf_size) {
|
||||||
|
NellyMoserDecodeContext *s = avctx->priv_data;
|
||||||
|
int blocks, i;
|
||||||
|
int16_t* samples;
|
||||||
|
*data_size = 0;
|
||||||
|
samples = (int16_t*)data;
|
||||||
|
|
||||||
|
if (buf_size < avctx->block_align)
|
||||||
|
return buf_size;
|
||||||
|
|
||||||
|
switch (buf_size) {
|
||||||
|
case 64: // 8000Hz
|
||||||
|
blocks = 1; break;
|
||||||
|
case 128: // 11025Hz
|
||||||
|
blocks = 2; break;
|
||||||
|
case 256: // 22050Hz
|
||||||
|
blocks = 4; break;
|
||||||
|
default:
|
||||||
|
av_log(avctx, AV_LOG_DEBUG, "Tag size %d unknown, report sample!\n", buf_size);
|
||||||
|
return buf_size;
|
||||||
|
}
|
||||||
|
|
||||||
|
for (i=0 ; i<blocks ; i++) {
|
||||||
|
nelly_decode_block(s, &buf[i*NELLY_BLOCK_LEN], s->float_buf);
|
||||||
|
s->dsp.float_to_int16(&samples[i*NELLY_SAMPLES], s->float_buf, NELLY_SAMPLES);
|
||||||
|
*data_size += NELLY_SAMPLES*sizeof(int16_t);
|
||||||
|
}
|
||||||
|
|
||||||
|
return blocks*NELLY_SAMPLES*sizeof(int16_t);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int decode_end(AVCodecContext * avctx) {
|
||||||
|
NellyMoserDecodeContext *s = avctx->priv_data;
|
||||||
|
|
||||||
|
ff_fft_end(&s->fftc);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
AVCodec nellymoser_decoder = {
|
||||||
|
"nellymoser",
|
||||||
|
CODEC_TYPE_AUDIO,
|
||||||
|
CODEC_ID_NELLYMOSER,
|
||||||
|
sizeof(NellyMoserDecodeContext),
|
||||||
|
decode_init,
|
||||||
|
NULL,
|
||||||
|
decode_end,
|
||||||
|
decode_tag,
|
||||||
|
};
|
||||||
|
|
||||||
@ -50,6 +50,8 @@ static void flv_set_audio_codec(AVFormatContext *s, AVStream *astream, int flv_c
|
|||||||
case FLV_CODECID_NELLYMOSER_8HZ_MONO:
|
case FLV_CODECID_NELLYMOSER_8HZ_MONO:
|
||||||
acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
|
acodec->sample_rate = 8000; //in case metadata does not otherwise declare samplerate
|
||||||
case FLV_CODECID_NELLYMOSER:
|
case FLV_CODECID_NELLYMOSER:
|
||||||
|
acodec->codec_id = CODEC_ID_NELLYMOSER;
|
||||||
|
break;
|
||||||
default:
|
default:
|
||||||
av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
|
av_log(s, AV_LOG_INFO, "Unsupported audio codec (%x)\n", flv_codecid >> FLV_AUDIO_CODECID_OFFSET);
|
||||||
acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
|
acodec->codec_tag = flv_codecid >> FLV_AUDIO_CODECID_OFFSET;
|
||||||
|
|||||||
Loading…
Reference in New Issue
Block a user