initial commit for Id RoQ and Interplay MVE multimedia subsystems

Originally committed as revision 2195 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 200 insertions, 0 deletions

diff --git a/libavcodec/dpcm.c b/libavcodec/dpcm.c
new file mode 100644
index 0000000000..bd3ad7fd0f
--- /dev/null
+++ b/libavcodec/dpcm.c
@@ -0,0 +1,200 @@
+/*
+ * 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)
+ * for more information on the specific data formats, visit:
+ *   http://www.pcisys.net/~melanson/codecs/simpleaudio.html
+ */
+
+#include "avcodec.h"
+
+typedef struct DPCMContext {
+    int channels;
+    short roq_square_array[256];
+    int last_delta[2];
+} 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 i;
+    int predictor[2];
+    int channel_number = 0;
+    short *output_samples = data;
+    int sequence_number;
+
+    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 = 0;
+        sequence_number = LE_16(&buf[in]);
+        in += 6;  /* skip over the stream mask and stream length */
+        if (sequence_number == 1) {
+            predictor[0] = LE_16(&buf[in]);
+            in += 2;
+            SE_16BIT(predictor[0])
+            if (s->channels == 2) {
+                predictor[1] = LE_16(&buf[in]);
+                SE_16BIT(predictor[1])
+                in += 2;
+            }
+        } else {
+            for (i = 0; i < s->channels; i++)
+                predictor[i] = s->last_delta[i];
+        }
+
+        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;
+        }
+
+        /* save predictors for next round */
+        for (i = 0; i < s->channels; i++)
+            s->last_delta[i] = predictor[i];
+
+        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,
+};