X-Git-Url: https://git.pterodactylus.net/?a=blobdiff_plain;f=synfig-core%2Ftags%2Fsynfig_0_61_05%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fdpcm.c;fp=synfig-core%2Ftags%2Fsynfig_0_61_05%2Fsynfig-core%2Fsrc%2Fmodules%2Fmod_libavcodec%2Flibavcodec%2Fdpcm.c;h=0000000000000000000000000000000000000000;hb=6fa8f2f38d4b0b35f8539bf94e27ae27015c7689;hp=ef4ccf886094951d888d41921b5531280deb2f9b;hpb=47fce282611fbba1044921d22ca887f9b53ad91a;p=synfig.git diff --git a/synfig-core/tags/synfig_0_61_05/synfig-core/src/modules/mod_libavcodec/libavcodec/dpcm.c b/synfig-core/tags/synfig_0_61_05/synfig-core/src/modules/mod_libavcodec/libavcodec/dpcm.c deleted file mode 100644 index ef4ccf8..0000000 --- a/synfig-core/tags/synfig_0_61_05/synfig-core/src/modules/mod_libavcodec/libavcodec/dpcm.c +++ /dev/null @@ -1,245 +0,0 @@ -/* - * Assorted DPCM codecs - * Copyright (c) 2003 The ffmpeg Project. - * - * This library is free software; you can redistribute it and/or - * modify it under the terms of the GNU Lesser General Public - * License as published by the Free Software Foundation; either - * version 2 of the License, or (at your option) any later version. - * - * This library is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * Lesser General Public License for more details. - * - * You should have received a copy of the GNU Lesser General Public - * License along with this library; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ - -/** - * @file: dpcm.c - * Assorted DPCM (differential pulse code modulation) audio codecs - * by Mike Melanson (melanson@pcisys.net) - * Xan DPCM decoder by Mario Brito (mbrito@student.dei.uc.pt) - * for more information on the specific data formats, visit: - * http://www.pcisys.net/~melanson/codecs/simpleaudio.html - * - * Note about using the Xan DPCM decoder: Xan DPCM is used in AVI files - * found in the Wing Commander IV computer game. These AVI files contain - * WAVEFORMAT headers which report the audio format as 0x01: raw PCM. - * Clearly incorrect. To detect Xan DPCM, you will probably have to - * special-case your AVI demuxer to use Xan DPCM if the file uses 'Xxan' - * (Xan video) for its video codec. Alternately, such AVI files also contain - * the fourcc 'Axan' in the 'auds' chunk of the AVI header. - */ - -#include "avcodec.h" - -typedef struct DPCMContext { - int channels; - short roq_square_array[256]; -} DPCMContext; - -#define SATURATE_S16(x) if (x < -32768) x = -32768; \ - else if (x > 32767) x = 32767; -#define SE_16BIT(x) if (x & 0x8000) x -= 0x10000; -#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0]) -#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \ - (((uint8_t*)(x))[2] << 16) | \ - (((uint8_t*)(x))[1] << 8) | \ - ((uint8_t*)(x))[0]) - -static int interplay_delta_table[] = { - 0, 1, 2, 3, 4, 5, 6, 7, - 8, 9, 10, 11, 12, 13, 14, 15, - 16, 17, 18, 19, 20, 21, 22, 23, - 24, 25, 26, 27, 28, 29, 30, 31, - 32, 33, 34, 35, 36, 37, 38, 39, - 40, 41, 42, 43, 47, 51, 56, 61, - 66, 72, 79, 86, 94, 102, 112, 122, - 133, 145, 158, 173, 189, 206, 225, 245, - 267, 292, 318, 348, 379, 414, 452, 493, - 538, 587, 640, 699, 763, 832, 908, 991, - 1081, 1180, 1288, 1405, 1534, 1673, 1826, 1993, - 2175, 2373, 2590, 2826, 3084, 3365, 3672, 4008, - 4373, 4772, 5208, 5683, 6202, 6767, 7385, 8059, - 8794, 9597, 10472, 11428, 12471, 13609, 14851, 16206, - 17685, 19298, 21060, 22981, 25078, 27367, 29864, 32589, - -29973, -26728, -23186, -19322, -15105, -10503, -5481, -1, - 1, 1, 5481, 10503, 15105, 19322, 23186, 26728, - 29973, -32589, -29864, -27367, -25078, -22981, -21060, -19298, - -17685, -16206, -14851, -13609, -12471, -11428, -10472, -9597, - -8794, -8059, -7385, -6767, -6202, -5683, -5208, -4772, - -4373, -4008, -3672, -3365, -3084, -2826, -2590, -2373, - -2175, -1993, -1826, -1673, -1534, -1405, -1288, -1180, - -1081, -991, -908, -832, -763, -699, -640, -587, - -538, -493, -452, -414, -379, -348, -318, -292, - -267, -245, -225, -206, -189, -173, -158, -145, - -133, -122, -112, -102, -94, -86, -79, -72, - -66, -61, -56, -51, -47, -43, -42, -41, - -40, -39, -38, -37, -36, -35, -34, -33, - -32, -31, -30, -29, -28, -27, -26, -25, - -24, -23, -22, -21, -20, -19, -18, -17, - -16, -15, -14, -13, -12, -11, -10, -9, - -8, -7, -6, -5, -4, -3, -2, -1 - -}; - -static int dpcm_decode_init(AVCodecContext *avctx) -{ - DPCMContext *s = avctx->priv_data; - int i; - short square; - - s->channels = avctx->channels; - - switch(avctx->codec->id) { - - case CODEC_ID_ROQ_DPCM: - /* initialize square table */ - for (i = 0; i < 128; i++) { - square = i * i; - s->roq_square_array[i] = square; - s->roq_square_array[i + 128] = -square; - } - break; - - default: - break; - } - - return 0; -} - -static int dpcm_decode_frame(AVCodecContext *avctx, - void *data, int *data_size, - uint8_t *buf, int buf_size) -{ - DPCMContext *s = avctx->priv_data; - int in, out = 0; - int predictor[2]; - int channel_number = 0; - short *output_samples = data; - int shift[2]; - unsigned char byte; - short diff; - - switch(avctx->codec->id) { - - case CODEC_ID_ROQ_DPCM: - if (s->channels == 1) - predictor[0] = LE_16(&buf[6]); - else { - predictor[0] = buf[7] << 8; - predictor[1] = buf[6] << 8; - } - SE_16BIT(predictor[0]); - SE_16BIT(predictor[1]); - - /* decode the samples */ - for (in = 8, out = 0; in < buf_size; in++, out++) { - predictor[channel_number] += s->roq_square_array[buf[in]]; - SATURATE_S16(predictor[channel_number]); - output_samples[out] = predictor[channel_number]; - - /* toggle channel */ - channel_number ^= s->channels - 1; - } - break; - - case CODEC_ID_INTERPLAY_DPCM: - in = 6; /* skip over the stream mask and stream length */ - predictor[0] = LE_16(&buf[in]); - in += 2; - SE_16BIT(predictor[0]) - output_samples[out++] = predictor[0]; - if (s->channels == 2) { - predictor[1] = LE_16(&buf[in]); - in += 2; - SE_16BIT(predictor[1]) - output_samples[out++] = predictor[1]; - } - - while (in < buf_size) { - predictor[channel_number] += interplay_delta_table[buf[in++]]; - SATURATE_S16(predictor[channel_number]); - output_samples[out++] = predictor[channel_number]; - - /* toggle channel */ - channel_number ^= s->channels - 1; - } - - break; - - case CODEC_ID_XAN_DPCM: - in = 0; - shift[0] = shift[1] = 4; - predictor[0] = LE_16(&buf[in]); - in += 2; - SE_16BIT(predictor[0]); - if (s->channels == 2) { - predictor[1] = LE_16(&buf[in]); - in += 2; - SE_16BIT(predictor[1]); - } - - while (in < buf_size) { - byte = buf[in++]; - diff = (byte & 0xFC) << 8; - if ((byte & 0x03) == 3) - shift[channel_number]++; - else - shift[channel_number] -= (2 * (byte & 3)); - /* saturate the shifter to a lower limit of 0 */ - if (shift[channel_number] < 0) - shift[channel_number] = 0; - - diff >>= shift[channel_number]; - predictor[channel_number] += diff; - - SATURATE_S16(predictor[channel_number]); - output_samples[out++] = predictor[channel_number]; - - /* toggle channel */ - channel_number ^= s->channels - 1; - } - break; - } - - *data_size = out * sizeof(short); - return buf_size; -} - -AVCodec roq_dpcm_decoder = { - "roq_dpcm", - CODEC_TYPE_AUDIO, - CODEC_ID_ROQ_DPCM, - sizeof(DPCMContext), - dpcm_decode_init, - NULL, - NULL, - dpcm_decode_frame, -}; - -AVCodec interplay_dpcm_decoder = { - "interplay_dpcm", - CODEC_TYPE_AUDIO, - CODEC_ID_INTERPLAY_DPCM, - sizeof(DPCMContext), - dpcm_decode_init, - NULL, - NULL, - dpcm_decode_frame, -}; - -AVCodec xan_dpcm_decoder = { - "xan_dpcm", - CODEC_TYPE_AUDIO, - CODEC_ID_XAN_DPCM, - sizeof(DPCMContext), - dpcm_decode_init, - NULL, - NULL, - dpcm_decode_frame, -};