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https://gitee.com/openharmony/third_party_ffmpeg
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Mimic decoder.
Originally committed as revision 12491 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ramiro Polla
parent
2119bb8f51
commit
a7129de51b
@ -113,6 +113,7 @@ version <next>
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- QT variant of IMA ADPCM encoder
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- VFW grabber
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- Ipod/Iphone compatible mp4 muxer
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- Mimic decoder
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version 0.4.9-pre1:
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@ -145,6 +145,7 @@ Codecs:
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loco.c Kostya Shishkov
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lzo.h, lzo.c Reimar Doeffinger
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mdec.c Michael Niedermayer
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mimic.c Ramiro Polla
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mjpeg.c Michael Niedermayer
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mpc* Kostya Shishkov
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mpeg12.c, mpeg12data.h Michael Niedermayer
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@ -103,6 +103,7 @@ OBJS-$(CONFIG_LJPEG_ENCODER) += ljpegenc.o mjpegenc.o mjpeg.o mpegvide
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OBJS-$(CONFIG_LOCO_DECODER) += loco.o golomb.o
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OBJS-$(CONFIG_MACE3_DECODER) += mace.o
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OBJS-$(CONFIG_MACE6_DECODER) += mace.o
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OBJS-$(CONFIG_MIMIC_DECODER) += mimic.o
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OBJS-$(CONFIG_MJPEG_DECODER) += mjpegdec.o mjpeg.o
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OBJS-$(CONFIG_MJPEG_ENCODER) += mjpegenc.o mjpeg.o mpegvideo_enc.o motion_est.o ratecontrol.o mpeg12data.o mpegvideo.o
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OBJS-$(CONFIG_MJPEGB_DECODER) += mjpegbdec.o mjpegdec.o mjpeg.o
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@ -101,6 +101,7 @@ void avcodec_register_all(void)
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REGISTER_ENCODER (LJPEG, ljpeg);
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REGISTER_DECODER (LOCO, loco);
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REGISTER_DECODER (MDEC, mdec);
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REGISTER_DECODER (MIMIC, mimic);
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REGISTER_ENCDEC (MJPEG, mjpeg);
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REGISTER_DECODER (MJPEGB, mjpegb);
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REGISTER_DECODER (MMVIDEO, mmvideo);
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@ -30,7 +30,7 @@
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#include "libavutil/avutil.h"
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#define LIBAVCODEC_VERSION_MAJOR 51
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#define LIBAVCODEC_VERSION_MINOR 51
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#define LIBAVCODEC_VERSION_MINOR 52
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#define LIBAVCODEC_VERSION_MICRO 0
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#define LIBAVCODEC_VERSION_INT AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
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@ -177,6 +177,7 @@ enum CodecID {
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CODEC_ID_SUNRAST,
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CODEC_ID_INDEO4,
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CODEC_ID_INDEO5,
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CODEC_ID_MIMIC,
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/* various PCM "codecs" */
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CODEC_ID_PCM_S16LE= 0x10000,
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398
libavcodec/mimic.c
Normal file
398
libavcodec/mimic.c
Normal file
@ -0,0 +1,398 @@
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/*
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* Copyright (C) 2005 Ole André Vadla Ravnås <oleavr@gmail.com>
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* Copyright (C) 2008 Ramiro Polla <ramiro@lisha.ufsc.br>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* 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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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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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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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include "avcodec.h"
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#include "bitstream.h"
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#include "dsputil.h"
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#define MIMIC_HEADER_SIZE 20
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typedef struct {
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AVCodecContext *avctx;
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int num_vblocks[3];
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int num_hblocks[3];
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uint8_t *swap_buf;
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int swap_buf_size;
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int cur_index;
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int prev_index;
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AVFrame buf_ptrs [16];
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AVPicture flipped_ptrs[16];
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DECLARE_ALIGNED_16(DCTELEM, dct_block[64]);
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GetBitContext gb;
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ScanTable scantable;
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DSPContext dsp;
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VLC vlc1;
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} MimicContext;
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static const uint32_t huffcodes[] = {
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0x0000000a, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000,
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0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x00000000, 0x0000000b,
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0x0000001b, 0x00000038, 0x00000078, 0x00000079, 0x0000007a, 0x000000f9,
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0x000000fa, 0x000003fb, 0x000007f8, 0x000007f9, 0x000007fa, 0x000007fb,
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0x00000ff8, 0x00000ff9, 0x00000001, 0x00000039, 0x0000007b, 0x000000fb,
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0x000001f8, 0x000001f9, 0x00000ffa, 0x00000ffb, 0x00001ff8, 0x00001ff9,
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0x00001ffa, 0x00001ffb, 0x00003ff8, 0x00003ff9, 0x00003ffa, 0x00000000,
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0x00000004, 0x0000003a, 0x000001fa, 0x00003ffb, 0x00007ff8, 0x00007ff9,
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0x00007ffa, 0x00007ffb, 0x0000fff8, 0x0000fff9, 0x0000fffa, 0x0000fffb,
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0x0001fff8, 0x0001fff9, 0x0001fffa, 0x00000000, 0x0000000c, 0x000000f8,
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0x000001fb, 0x0001fffb, 0x0003fff8, 0x0003fff9, 0x0003fffa, 0x0003fffb,
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0x0007fff8, 0x0007fff9, 0x0007fffa, 0x0007fffb, 0x000ffff8, 0x000ffff9,
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0x000ffffa, 0x00000000, 0x0000001a, 0x000003f8, 0x000ffffb, 0x001ffff8,
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0x001ffff9, 0x001ffffa, 0x001ffffb, 0x003ffff8, 0x003ffff9, 0x003ffffa,
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0x003ffffb, 0x007ffff8, 0x007ffff9, 0x007ffffa, 0x007ffffb, 0x00000000,
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0x0000003b, 0x000003f9, 0x00fffff8, 0x00fffff9, 0x00fffffa, 0x00fffffb,
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0x01fffff8, 0x01fffff9, 0x01fffffa, 0x01fffffb, 0x03fffff8, 0x03fffff9,
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0x03fffffa, 0x03fffffb, 0x07fffff8, 0x00000000, 0x000003fa, 0x07fffff9,
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0x07fffffa, 0x07fffffb, 0x0ffffff8, 0x0ffffff9, 0x0ffffffa, 0x0ffffffb,
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0x1ffffff8, 0x1ffffff9, 0x1ffffffa, 0x1ffffffb, 0x3ffffff8, 0x3ffffff9,
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0x3ffffffa,
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};
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static const uint8_t huffbits[] = {
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4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 2, 4, 5, 6, 7, 7, 7, 8,
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8, 10, 11, 11, 11, 11, 12, 12, 2, 6, 7, 8,
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9, 9, 12, 12, 13, 13, 13, 13, 14, 14, 14, 0,
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3, 6, 9, 14, 15, 15, 15, 15, 16, 16, 16, 16,
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17, 17, 17, 0, 4, 8, 9, 17, 18, 18, 18, 18,
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19, 19, 19, 19, 20, 20, 20, 0, 5, 10, 20, 21,
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21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, 0,
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6, 10, 24, 24, 24, 24, 25, 25, 25, 25, 26, 26,
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26, 26, 27, 0, 10, 27, 27, 27, 28, 28, 28, 28,
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29, 29, 29, 29, 30, 30, 30,
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};
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static const uint8_t col_zag[64] = {
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0, 8, 1, 2, 9, 16, 24, 17,
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10, 3, 4, 11, 18, 25, 32, 40,
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33, 26, 19, 12, 5, 6, 13, 20,
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27, 34, 41, 48, 56, 49, 42, 35,
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28, 21, 14, 7, 15, 22, 29, 36,
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43, 50, 57, 58, 51, 44, 37, 30,
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23, 31, 38, 45, 52, 59, 39, 46,
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53, 60, 61, 54, 47, 55, 62, 63
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};
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static int mimic_decode_init(AVCodecContext *avctx)
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{
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MimicContext *ctx = avctx->priv_data;
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ctx->prev_index = 0;
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ctx->cur_index = 15;
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if(init_vlc(&ctx->vlc1, 8, sizeof(huffbits)/sizeof(huffbits[0]),
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huffbits, 1, 1, huffcodes, 4, 4, 0)) {
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av_log(avctx, AV_LOG_ERROR, "error initializing vlc table\n");
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return -1;
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}
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dsputil_init(&ctx->dsp, avctx);
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ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, col_zag);
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return 0;
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}
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const static int8_t vlcdec_lookup[9][64] = {
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{ 0, },
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{ -1, 1, },
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{ -3, 3, -2, 2, },
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{ -7, 7, -6, 6, -5, 5, -4, 4, },
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{ -15, 15, -14, 14, -13, 13, -12, 12,
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-11, 11, -10, 10, -9, 9, -8, 8, },
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{ -31, 31, -30, 30, -29, 29, -28, 28,
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-27, 27, -26, 26, -25, 25, -24, 24,
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-23, 23, -22, 22, -21, 21, -20, 20,
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-19, 19, -18, 18, -17, 17, -16, 16, },
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{ -63, 63, -62, 62, -61, 61, -60, 60,
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-59, 59, -58, 58, -57, 57, -56, 56,
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-55, 55, -54, 54, -53, 53, -52, 52,
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-51, 51, -50, 50, -49, 49, -48, 48,
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-47, 47, -46, 46, -45, 45, -44, 44,
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-43, 43, -42, 42, -41, 41, -40, 40,
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-39, 39, -38, 38, -37, 37, -36, 36,
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-35, 35, -34, 34, -33, 33, -32, 32, },
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{ -127, 127, -126, 126, -125, 125, -124, 124,
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-123, 123, -122, 122, -121, 121, -120, 120,
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-119, 119, -118, 118, -117, 117, -116, 116,
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-115, 115, -114, 114, -113, 113, -112, 112,
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-111, 111, -110, 110, -109, 109, -108, 108,
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-107, 107, -106, 106, -105, 105, -104, 104,
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-103, 103, -102, 102, -101, 101, -100, 100,
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-99, 99, -98, 98, -97, 97, -96, 96, },
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{ -95, 95, -94, 94, -93, 93, -92, 92,
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-91, 91, -90, 90, -89, 89, -88, 88,
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-87, 87, -86, 86, -85, 85, -84, 84,
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-83, 83, -82, 82, -81, 81, -80, 80,
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-79, 79, -78, 78, -77, 77, -76, 76,
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-75, 75, -74, 74, -73, 73, -72, 72,
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-71, 71, -70, 70, -69, 69, -68, 68,
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-67, 67, -66, 66, -65, 65, -64, 64, },
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};
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static int vlc_decode_block(MimicContext *ctx, DCTELEM *block, int num_coeffs,
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int qscale)
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{
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unsigned int pos;
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memset(block, 0, 64 * sizeof(DCTELEM));
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block[0] = get_bits(&ctx->gb, 8) << 3;
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for(pos = 1; pos < num_coeffs; pos++) {
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uint32_t vlc, num_bits;
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int value;
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int coeff;
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vlc = get_vlc2(&ctx->gb, ctx->vlc1.table, ctx->vlc1.bits, 4);
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if(!vlc) /* end-of-block code */
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return 1;
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if(vlc == -1)
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return 0;
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/* pos_add and num_bits are coded in the vlc code */
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pos += vlc&15; // pos_add
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num_bits = vlc>>4; // num_bits
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if(pos >= 64)
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return 0;
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value = get_bits(&ctx->gb, num_bits);
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/* FFmpeg's IDCT behaves somewhat different from the original code, so
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* a factor of 4 was added to the input */
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coeff = vlcdec_lookup[num_bits][value];
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if(pos<3)
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coeff <<= 4;
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else /* TODO Use >> 10 instead of / 1001 */
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coeff = (coeff * qscale) / 1001;
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block[ctx->scantable.permutated[pos]] = coeff;
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}
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return 1;
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}
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static int decode(MimicContext *ctx, int quality, int num_coeffs,
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int is_iframe)
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{
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int y, x, plane;
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for(plane = 0; plane < 3; plane++) {
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const int is_chroma = !!plane;
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const int qscale = av_clip(10000-quality,is_chroma?1000:2000,10000)<<2;
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const int stride = ctx->flipped_ptrs[ctx->cur_index].linesize[plane];
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const uint8_t *src = ctx->flipped_ptrs[ctx->prev_index].data[plane];
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uint8_t *dst = ctx->flipped_ptrs[ctx->cur_index ].data[plane];
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for(y = 0 ; y < ctx->num_vblocks[plane] ; y++) {
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for(x = 0; x < ctx->num_hblocks[plane]; x++) {
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/* Check for a change condition in the current block.
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* - iframes always change.
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* - Luma plane changes on get_bits1 == 0
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* - Chroma planes change on get_bits1 == 1 */
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if(is_iframe || get_bits1(&ctx->gb) == is_chroma) {
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/* Luma planes may use a backreference from the 15 last
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* frames preceding the previous. (get_bits1 == 1)
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* Chroma planes don't use backreferences. */
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if(is_chroma || is_iframe || !get_bits1(&ctx->gb)) {
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if(!vlc_decode_block(ctx, ctx->dct_block,
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num_coeffs, qscale))
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return 0;
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ctx->dsp.idct_put(dst, stride, ctx->dct_block);
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} else {
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unsigned int backref = get_bits(&ctx->gb, 4);
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int index = (ctx->cur_index+backref)&15;
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uint8_t *p = ctx->flipped_ptrs[index].data[0];
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if(p) {
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p += src -
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ctx->flipped_ptrs[ctx->prev_index].data[plane];
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ctx->dsp.put_pixels_tab[1][0](dst, p, stride, 8);
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} else {
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av_log(ctx->avctx, AV_LOG_ERROR,
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"No such backreference! Buggy sample.\n");
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}
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}
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} else {
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ctx->dsp.put_pixels_tab[1][0](dst, src, stride, 8);
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}
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src += 8;
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dst += 8;
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}
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src += (stride - ctx->num_hblocks[plane])<<3;
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dst += (stride - ctx->num_hblocks[plane])<<3;
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}
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}
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return 1;
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}
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/**
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* Flip the buffer upside-down and put it in the YVU order to match the
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* way Mimic encodes frames.
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*/
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static void prepare_avpic(MimicContext *ctx, AVPicture *dst, AVPicture *src)
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{
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int i;
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dst->data[0] = src->data[0]+( ctx->avctx->height -1)*src->linesize[0];
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dst->data[1] = src->data[2]+((ctx->avctx->height>>1)-1)*src->linesize[2];
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dst->data[2] = src->data[1]+((ctx->avctx->height>>1)-1)*src->linesize[1];
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for(i = 0 ; i < 3 ; i++)
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dst->linesize[i] = -src->linesize[i];
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}
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static int mimic_decode_frame(AVCodecContext *avctx, void *data,
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int *data_size, const uint8_t *buf, int buf_size)
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{
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MimicContext *ctx = avctx->priv_data;
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int is_pframe;
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int width, height;
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int quality, num_coeffs;
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int swap_buf_size = buf_size - MIMIC_HEADER_SIZE;
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/*
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* Header structure:
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* uint16_t I_dont_remember;
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* uint16_t quality;
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* uint16_t width;
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* uint16_t height;
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* uint32_t some_constant;
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* uint32_t is_pframe;
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* uint32_t num_coeffs;
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*/
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if(buf_size < MIMIC_HEADER_SIZE) {
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av_log(avctx, AV_LOG_ERROR, "insufficient data\n");
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return -1;
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}
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width = AV_RL16(buf + 4);
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height = AV_RL16(buf + 6);
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if(!ctx->avctx) {
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int i;
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if(!(width == 160 && height == 120) &&
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!(width == 320 && height == 240)) {
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av_log(avctx, AV_LOG_ERROR, "invalid width/height!\n");
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return -1;
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}
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ctx->avctx = avctx;
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avctx->width = width;
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avctx->height = height;
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avctx->pix_fmt = PIX_FMT_YUV420P;
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for(i = 0 ; i < 3 ; i++) {
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ctx->num_vblocks[i] = -((-height) >> (3 + !!i));
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ctx->num_hblocks[i] = width >> (3 + !!i) ;
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}
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} else if(width != ctx->avctx->width || height != ctx->avctx->height) {
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av_log(avctx, AV_LOG_ERROR, "resolution changing is not supported\n");
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return -1;
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}
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quality = AV_RL16(buf + 2);
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is_pframe = AV_RL32(buf + 12);
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num_coeffs = buf[16];
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if(is_pframe && !ctx->buf_ptrs[ctx->prev_index].data[0]) {
|
||||
av_log(avctx, AV_LOG_ERROR, "decoding must start with keyframe\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
ctx->buf_ptrs[ctx->cur_index].reference = 1;
|
||||
if(avctx->get_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index])) {
|
||||
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
|
||||
return -1;
|
||||
}
|
||||
|
||||
prepare_avpic(ctx, &ctx->flipped_ptrs[ctx->cur_index],
|
||||
(AVPicture*) &ctx->buf_ptrs[ctx->cur_index]);
|
||||
|
||||
ctx->swap_buf = av_fast_realloc(ctx->swap_buf, &ctx->swap_buf_size,
|
||||
swap_buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
||||
if(!ctx->swap_buf)
|
||||
return AVERROR_NOMEM;
|
||||
|
||||
ctx->dsp.bswap_buf((uint32_t*)ctx->swap_buf,
|
||||
(const uint32_t*) (buf + MIMIC_HEADER_SIZE),
|
||||
swap_buf_size>>2);
|
||||
init_get_bits(&ctx->gb, ctx->swap_buf, swap_buf_size << 3);
|
||||
|
||||
if(!decode(ctx, quality, num_coeffs, !is_pframe)) {
|
||||
avctx->release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
|
||||
return -1;
|
||||
}
|
||||
|
||||
ctx->buf_ptrs[ctx->cur_index].pict_type = is_pframe ? FF_P_TYPE:FF_I_TYPE;
|
||||
*(AVFrame*)data = ctx->buf_ptrs[ctx->cur_index];
|
||||
*data_size = sizeof(AVFrame);
|
||||
|
||||
ctx->prev_index = ctx->cur_index;
|
||||
ctx->cur_index--;
|
||||
ctx->cur_index &= 15;
|
||||
|
||||
/* Only release frames that aren't used for backreferences anymore */
|
||||
if(ctx->buf_ptrs[ctx->cur_index].data[0])
|
||||
avctx->release_buffer(avctx, &ctx->buf_ptrs[ctx->cur_index]);
|
||||
|
||||
return buf_size;
|
||||
}
|
||||
|
||||
static int mimic_decode_end(AVCodecContext *avctx)
|
||||
{
|
||||
MimicContext *ctx = avctx->priv_data;
|
||||
int i;
|
||||
|
||||
av_free(ctx->swap_buf);
|
||||
for(i = 0; i < 16; i++)
|
||||
if(ctx->buf_ptrs[i].data[0])
|
||||
avctx->release_buffer(avctx, &ctx->buf_ptrs[i]);
|
||||
free_vlc(&ctx->vlc1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
AVCodec mimic_decoder = {
|
||||
"mimic",
|
||||
CODEC_TYPE_VIDEO,
|
||||
CODEC_ID_MIMIC,
|
||||
sizeof(MimicContext),
|
||||
mimic_decode_init,
|
||||
NULL,
|
||||
mimic_decode_end,
|
||||
mimic_decode_frame,
|
||||
CODEC_CAP_DR1,
|
||||
};
|
||||
Loading…
Reference in New Issue
Block a user