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Diffstat (limited to 'src/libffmpeg/libavcodec/dpcm.c')
-rw-r--r--src/libffmpeg/libavcodec/dpcm.c335
1 files changed, 0 insertions, 335 deletions
diff --git a/src/libffmpeg/libavcodec/dpcm.c b/src/libffmpeg/libavcodec/dpcm.c
deleted file mode 100644
index 6243881de..000000000
--- a/src/libffmpeg/libavcodec/dpcm.c
+++ /dev/null
@@ -1,335 +0,0 @@
-/*
- * Assorted DPCM codecs
- * Copyright (c) 2003 The ffmpeg Project.
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
- * SOL DPCMs implemented by Konstantin Shishkov
- *
- * 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];
- long sample[2];//for SOL_DPCM
- const int *sol_table;//for SOL_DPCM
-} 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;
-
-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 const int sol_table_old[16] =
- { 0x0, 0x1, 0x2 , 0x3, 0x6, 0xA, 0xF, 0x15,
- -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1, 0x0};
-
-static const int sol_table_new[16] =
- { 0x0, 0x1, 0x2, 0x3, 0x6, 0xA, 0xF, 0x15,
- 0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15};
-
-static const int sol_table_16[128] = {
- 0x000, 0x008, 0x010, 0x020, 0x030, 0x040, 0x050, 0x060, 0x070, 0x080,
- 0x090, 0x0A0, 0x0B0, 0x0C0, 0x0D0, 0x0E0, 0x0F0, 0x100, 0x110, 0x120,
- 0x130, 0x140, 0x150, 0x160, 0x170, 0x180, 0x190, 0x1A0, 0x1B0, 0x1C0,
- 0x1D0, 0x1E0, 0x1F0, 0x200, 0x208, 0x210, 0x218, 0x220, 0x228, 0x230,
- 0x238, 0x240, 0x248, 0x250, 0x258, 0x260, 0x268, 0x270, 0x278, 0x280,
- 0x288, 0x290, 0x298, 0x2A0, 0x2A8, 0x2B0, 0x2B8, 0x2C0, 0x2C8, 0x2D0,
- 0x2D8, 0x2E0, 0x2E8, 0x2F0, 0x2F8, 0x300, 0x308, 0x310, 0x318, 0x320,
- 0x328, 0x330, 0x338, 0x340, 0x348, 0x350, 0x358, 0x360, 0x368, 0x370,
- 0x378, 0x380, 0x388, 0x390, 0x398, 0x3A0, 0x3A8, 0x3B0, 0x3B8, 0x3C0,
- 0x3C8, 0x3D0, 0x3D8, 0x3E0, 0x3E8, 0x3F0, 0x3F8, 0x400, 0x440, 0x480,
- 0x4C0, 0x500, 0x540, 0x580, 0x5C0, 0x600, 0x640, 0x680, 0x6C0, 0x700,
- 0x740, 0x780, 0x7C0, 0x800, 0x900, 0xA00, 0xB00, 0xC00, 0xD00, 0xE00,
- 0xF00, 0x1000, 0x1400, 0x1800, 0x1C00, 0x2000, 0x3000, 0x4000
-};
-
-
-
-static int dpcm_decode_init(AVCodecContext *avctx)
-{
- DPCMContext *s = avctx->priv_data;
- int i;
- short square;
-
- s->channels = avctx->channels;
- s->sample[0] = s->sample[1] = 0;
-
- 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;
-
-
- case CODEC_ID_SOL_DPCM:
- switch(avctx->codec_tag){
- case 1:
- s->sol_table=sol_table_old;
- s->sample[0] = s->sample[1] = 0x80;
- break;
- case 2:
- s->sol_table=sol_table_new;
- s->sample[0] = s->sample[1] = 0x80;
- break;
- case 3:
- s->sol_table=sol_table_16;
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n");
- return -1;
- }
- 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;
-
- if (!buf_size)
- return 0;
-
- switch(avctx->codec->id) {
-
- case CODEC_ID_ROQ_DPCM:
- if (s->channels == 1)
- predictor[0] = AV_RL16(&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] = AV_RL16(&buf[in]);
- in += 2;
- SE_16BIT(predictor[0])
- output_samples[out++] = predictor[0];
- if (s->channels == 2) {
- predictor[1] = AV_RL16(&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] = AV_RL16(&buf[in]);
- in += 2;
- SE_16BIT(predictor[0]);
- if (s->channels == 2) {
- predictor[1] = AV_RL16(&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;
- case CODEC_ID_SOL_DPCM:
- in = 0;
- if (avctx->codec_tag != 3) {
- while (in < buf_size) {
- int n1, n2;
- n1 = (buf[in] >> 4) & 0xF;
- n2 = buf[in++] & 0xF;
- s->sample[0] += s->sol_table[n1];
- if (s->sample[0] < 0) s->sample[0] = 0;
- if (s->sample[0] > 255) s->sample[0] = 255;
- output_samples[out++] = (s->sample[0] - 128) << 8;
- s->sample[s->channels - 1] += s->sol_table[n2];
- if (s->sample[s->channels - 1] < 0) s->sample[s->channels - 1] = 0;
- if (s->sample[s->channels - 1] > 255) s->sample[s->channels - 1] = 255;
- output_samples[out++] = (s->sample[s->channels - 1] - 128) << 8;
- }
- } else {
- while (in < buf_size) {
- int n;
- n = buf[in++];
- if (n & 0x80) s->sample[channel_number] -= s->sol_table[n & 0x7F];
- else s->sample[channel_number] += s->sol_table[n & 0x7F];
- SATURATE_S16(s->sample[channel_number]);
- output_samples[out++] = s->sample[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,
-};
-
-AVCodec sol_dpcm_decoder = {
- "sol_dpcm",
- CODEC_TYPE_AUDIO,
- CODEC_ID_SOL_DPCM,
- sizeof(DPCMContext),
- dpcm_decode_init,
- NULL,
- NULL,
- dpcm_decode_frame,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 14:08:26 +0000