adding ffmpeg specific version

1 files changed, 343 insertions, 0 deletions

diff --git a/ffmpeg1/libavcodec/dpcm.c b/ffmpeg1/libavcodec/dpcm.c
new file mode 100644
index 0000000..402b0f9
--- /dev/null
+++ b/ffmpeg1/libavcodec/dpcm.c
@@ -0,0 +1,343 @@
+/*
+ * 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
+ * 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 "libavutil/intreadwrite.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+#include "mathops.h"
+
+typedef struct DPCMContext {
+    int16_t roq_square_array[256];
+    int sample[2];                  ///< previous sample (for SOL_DPCM)
+    const int8_t *sol_table;        ///< delta table for SOL_DPCM
+} DPCMContext;
+
+static const int16_t 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 int8_t sol_table_old[16] = {
+      0x0,  0x1,  0x2,  0x3,  0x6,  0xA,  0xF, 0x15,
+    -0x15, -0xF, -0xA, -0x6, -0x3, -0x2, -0x1,  0x0
+};
+
+static const int8_t sol_table_new[16] = {
+    0x0,  0x1,  0x2,  0x3,  0x6,  0xA,  0xF,  0x15,
+    0x0, -0x1, -0x2, -0x3, -0x6, -0xA, -0xF, -0x15
+};
+
+static const int16_t 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 av_cold int dpcm_decode_init(AVCodecContext *avctx)
+{
+    DPCMContext *s = avctx->priv_data;
+    int i;
+
+    if (avctx->channels < 1 || avctx->channels > 2) {
+        av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
+        return AVERROR(EINVAL);
+    }
+
+    s->sample[0] = s->sample[1] = 0;
+
+    switch(avctx->codec->id) {
+
+    case AV_CODEC_ID_ROQ_DPCM:
+        /* initialize square table */
+        for (i = 0; i < 128; i++) {
+            int16_t square = i * i;
+            s->roq_square_array[i      ] =  square;
+            s->roq_square_array[i + 128] = -square;
+        }
+        break;
+
+    case AV_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:
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "Unknown SOL subcodec\n");
+            return -1;
+        }
+        break;
+
+    default:
+        break;
+    }
+
+    if (avctx->codec->id == AV_CODEC_ID_SOL_DPCM && avctx->codec_tag != 3)
+        avctx->sample_fmt = AV_SAMPLE_FMT_U8;
+    else
+        avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+
+    return 0;
+}
+
+
+static int dpcm_decode_frame(AVCodecContext *avctx, void *data,
+                             int *got_frame_ptr, AVPacket *avpkt)
+{
+    int buf_size = avpkt->size;
+    DPCMContext *s = avctx->priv_data;
+    AVFrame *frame = data;
+    int out = 0, ret;
+    int predictor[2];
+    int ch = 0;
+    int stereo = avctx->channels - 1;
+    int16_t *output_samples, *samples_end;
+    GetByteContext gb;
+
+    if (stereo && (buf_size & 1))
+        buf_size--;
+    bytestream2_init(&gb, avpkt->data, buf_size);
+
+    /* calculate output size */
+    switch(avctx->codec->id) {
+    case AV_CODEC_ID_ROQ_DPCM:
+        out = buf_size - 8;
+        break;
+    case AV_CODEC_ID_INTERPLAY_DPCM:
+        out = buf_size - 6 - avctx->channels;
+        break;
+    case AV_CODEC_ID_XAN_DPCM:
+        out = buf_size - 2 * avctx->channels;
+        break;
+    case AV_CODEC_ID_SOL_DPCM:
+        if (avctx->codec_tag != 3)
+            out = buf_size * 2;
+        else
+            out = buf_size;
+        break;
+    }
+    if (out <= 0) {
+        av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
+        return AVERROR(EINVAL);
+    }
+    if (out % avctx->channels) {
+        av_log(avctx, AV_LOG_WARNING, "channels have differing number of samples\n");
+    }
+
+    /* get output buffer */
+    frame->nb_samples = (out + avctx->channels - 1) / avctx->channels;
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+    output_samples = (int16_t *)frame->data[0];
+    samples_end = output_samples + out;
+
+    switch(avctx->codec->id) {
+
+    case AV_CODEC_ID_ROQ_DPCM:
+        bytestream2_skipu(&gb, 6);
+
+        if (stereo) {
+            predictor[1] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16);
+            predictor[0] = sign_extend(bytestream2_get_byteu(&gb) << 8, 16);
+        } else {
+            predictor[0] = sign_extend(bytestream2_get_le16u(&gb), 16);
+        }
+
+        /* decode the samples */
+        while (output_samples < samples_end) {
+            predictor[ch] += s->roq_square_array[bytestream2_get_byteu(&gb)];
+            predictor[ch]  = av_clip_int16(predictor[ch]);
+            *output_samples++ = predictor[ch];
+
+            /* toggle channel */
+            ch ^= stereo;
+        }
+        break;
+
+    case AV_CODEC_ID_INTERPLAY_DPCM:
+        bytestream2_skipu(&gb, 6);  /* skip over the stream mask and stream length */
+
+        for (ch = 0; ch < avctx->channels; ch++) {
+            predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16);
+            *output_samples++ = predictor[ch];
+        }
+
+        ch = 0;
+        while (output_samples < samples_end) {
+            predictor[ch] += interplay_delta_table[bytestream2_get_byteu(&gb)];
+            predictor[ch]  = av_clip_int16(predictor[ch]);
+            *output_samples++ = predictor[ch];
+
+            /* toggle channel */
+            ch ^= stereo;
+        }
+        break;
+
+    case AV_CODEC_ID_XAN_DPCM:
+    {
+        int shift[2] = { 4, 4 };
+
+        for (ch = 0; ch < avctx->channels; ch++)
+            predictor[ch] = sign_extend(bytestream2_get_le16u(&gb), 16);
+
+        ch = 0;
+        while (output_samples < samples_end) {
+            int diff = bytestream2_get_byteu(&gb);
+            int n    = diff & 3;
+
+            if (n == 3)
+                shift[ch]++;
+            else
+                shift[ch] -= (2 * n);
+            diff = sign_extend((diff &~ 3) << 8, 16);
+
+            /* saturate the shifter to a lower limit of 0 */
+            if (shift[ch] < 0)
+                shift[ch] = 0;
+
+            diff >>= shift[ch];
+            predictor[ch] += diff;
+
+            predictor[ch] = av_clip_int16(predictor[ch]);
+            *output_samples++ = predictor[ch];
+
+            /* toggle channel */
+            ch ^= stereo;
+        }
+        break;
+    }
+    case AV_CODEC_ID_SOL_DPCM:
+        if (avctx->codec_tag != 3) {
+            uint8_t *output_samples_u8 = frame->data[0],
+                    *samples_end_u8 = output_samples_u8 + out;
+            while (output_samples_u8 < samples_end_u8) {
+                int n = bytestream2_get_byteu(&gb);
+
+                s->sample[0] += s->sol_table[n >> 4];
+                s->sample[0]  = av_clip_uint8(s->sample[0]);
+                *output_samples_u8++ = s->sample[0];
+
+                s->sample[stereo] += s->sol_table[n & 0x0F];
+                s->sample[stereo]  = av_clip_uint8(s->sample[stereo]);
+                *output_samples_u8++ = s->sample[stereo];
+            }
+        } else {
+            while (output_samples < samples_end) {
+                int n = bytestream2_get_byteu(&gb);
+                if (n & 0x80) s->sample[ch] -= sol_table_16[n & 0x7F];
+                else          s->sample[ch] += sol_table_16[n & 0x7F];
+                s->sample[ch] = av_clip_int16(s->sample[ch]);
+                *output_samples++ = s->sample[ch];
+                /* toggle channel */
+                ch ^= stereo;
+            }
+        }
+        break;
+    }
+
+    *got_frame_ptr = 1;
+
+    return avpkt->size;
+}
+
+#define DPCM_DECODER(id_, name_, long_name_)                \
+AVCodec ff_ ## name_ ## _decoder = {                        \
+    .name           = #name_,                               \
+    .type           = AVMEDIA_TYPE_AUDIO,                   \
+    .id             = id_,                                  \
+    .priv_data_size = sizeof(DPCMContext),                  \
+    .init           = dpcm_decode_init,                     \
+    .decode         = dpcm_decode_frame,                    \
+    .capabilities   = CODEC_CAP_DR1,                        \
+    .long_name      = NULL_IF_CONFIG_SMALL(long_name_),     \
+}
+
+DPCM_DECODER(AV_CODEC_ID_INTERPLAY_DPCM, interplay_dpcm, "DPCM Interplay");
+DPCM_DECODER(AV_CODEC_ID_ROQ_DPCM,       roq_dpcm,       "DPCM id RoQ");
+DPCM_DECODER(AV_CODEC_ID_SOL_DPCM,       sol_dpcm,       "DPCM Sol");
+DPCM_DECODER(AV_CODEC_ID_XAN_DPCM,       xan_dpcm,       "DPCM Xan");