dsicin: Split audio and video decoder

Signed-off-by: Diego Biurrun <diego@biurrun.de>

1 files changed, 135 insertions, 0 deletions

diff --git a/libavcodec/dsicinaudio.c b/libavcodec/dsicinaudio.c
new file mode 100644
index 0000000000..969e4ae195
--- /dev/null
+++ b/libavcodec/dsicinaudio.c
@@ -0,0 +1,135 @@
+/*
+ * Delphine Software International CIN audio decoder
+ * Copyright (c) 2006 Gregory Montoir (cyx@users.sourceforge.net)
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Delphine Software International CIN audio decoder
+ */
+
+#include "libavutil/channel_layout.h"
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+#include "mathops.h"
+
+typedef struct CinAudioContext {
+    int initial_decode_frame;
+    int delta;
+} CinAudioContext;
+
+
+/* table defining a geometric sequence with multiplier = 32767 ^ (1 / 128) */
+static const int16_t cinaudio_delta16_table[256] = {
+         0,      0,      0,      0,      0,      0,      0,      0,
+         0,      0,      0,      0,      0,      0,      0,      0,
+         0,      0,      0, -30210, -27853, -25680, -23677, -21829,
+    -20126, -18556, -17108, -15774, -14543, -13408, -12362, -11398,
+    -10508,  -9689,  -8933,  -8236,  -7593,  -7001,  -6455,  -5951,
+     -5487,  -5059,  -4664,  -4300,  -3964,  -3655,  -3370,  -3107,
+     -2865,  -2641,  -2435,  -2245,  -2070,  -1908,  -1759,  -1622,
+     -1495,  -1379,  -1271,  -1172,  -1080,   -996,   -918,   -847,
+      -781,   -720,   -663,   -612,   -564,   -520,   -479,   -442,
+      -407,   -376,   -346,   -319,   -294,   -271,   -250,   -230,
+      -212,   -196,   -181,   -166,   -153,   -141,   -130,   -120,
+      -111,   -102,    -94,    -87,    -80,    -74,    -68,    -62,
+       -58,    -53,    -49,    -45,    -41,    -38,    -35,    -32,
+       -30,    -27,    -25,    -23,    -21,    -20,    -18,    -17,
+       -15,    -14,    -13,    -12,    -11,    -10,     -9,     -8,
+        -7,     -6,     -5,     -4,     -3,     -2,     -1,      0,
+         0,      1,      2,      3,      4,      5,      6,      7,
+         8,      9,     10,     11,     12,     13,     14,     15,
+        17,     18,     20,     21,     23,     25,     27,     30,
+        32,     35,     38,     41,     45,     49,     53,     58,
+        62,     68,     74,     80,     87,     94,    102,    111,
+       120,    130,    141,    153,    166,    181,    196,    212,
+       230,    250,    271,    294,    319,    346,    376,    407,
+       442,    479,    520,    564,    612,    663,    720,    781,
+       847,    918,    996,   1080,   1172,   1271,   1379,   1495,
+      1622,   1759,   1908,   2070,   2245,   2435,   2641,   2865,
+      3107,   3370,   3655,   3964,   4300,   4664,   5059,   5487,
+      5951,   6455,   7001,   7593,   8236,   8933,   9689,  10508,
+     11398,  12362,  13408,  14543,  15774,  17108,  18556,  20126,
+     21829,  23677,  25680,  27853,  30210,      0,      0,      0,
+         0,      0,      0,      0,      0,      0,      0,      0,
+         0,      0,      0,      0,      0,      0,      0,      0
+};
+
+static av_cold int cinaudio_decode_init(AVCodecContext *avctx)
+{
+    CinAudioContext *cin = avctx->priv_data;
+
+    cin->initial_decode_frame = 1;
+    cin->delta                = 0;
+    avctx->sample_fmt         = AV_SAMPLE_FMT_S16;
+    avctx->channels           = 1;
+    avctx->channel_layout     = AV_CH_LAYOUT_MONO;
+
+    return 0;
+}
+
+static int cinaudio_decode_frame(AVCodecContext *avctx, void *data,
+                                 int *got_frame_ptr, AVPacket *avpkt)
+{
+    AVFrame *frame         = data;
+    const uint8_t *buf     = avpkt->data;
+    CinAudioContext *cin   = avctx->priv_data;
+    const uint8_t *buf_end = buf + avpkt->size;
+    int16_t *samples;
+    int delta, ret;
+
+    /* get output buffer */
+    frame->nb_samples = avpkt->size - cin->initial_decode_frame;
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+        return ret;
+    }
+    samples = (int16_t *)frame->data[0];
+
+    delta = cin->delta;
+    if (cin->initial_decode_frame) {
+        cin->initial_decode_frame = 0;
+        delta                     = sign_extend(AV_RL16(buf), 16);
+        buf                      += 2;
+        *samples++                = delta;
+    }
+    while (buf < buf_end) {
+        delta     += cinaudio_delta16_table[*buf++];
+        delta      = av_clip_int16(delta);
+        *samples++ = delta;
+    }
+    cin->delta = delta;
+
+    *got_frame_ptr = 1;
+
+    return avpkt->size;
+}
+
+AVCodec ff_dsicinaudio_decoder = {
+    .name           = "dsicinaudio",
+    .long_name      = NULL_IF_CONFIG_SMALL("Delphine Software International CIN audio"),
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_DSICINAUDIO,
+    .priv_data_size = sizeof(CinAudioContext),
+    .init           = cinaudio_decode_init,
+    .decode         = cinaudio_decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+};