split adx encoder in its own file

Originally committed as revision 10903 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 193 insertions, 0 deletions

diff --git a/libavcodec/adxenc.c b/libavcodec/adxenc.c
new file mode 100644
index 0000000000..4c3d74e3b2
--- /dev/null
+++ b/libavcodec/adxenc.c
@@ -0,0 +1,193 @@
+/*
+ * ADX ADPCM codecs
+ * Copyright (c) 2001,2003 BERO
+ *
+ * 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
+ */
+#include "avcodec.h"
+#include "adx.h"
+
+/**
+ * @file adx.c
+ * SEGA CRI adx codecs.
+ *
+ * Reference documents:
+ * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
+ * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
+ */
+
+/* 18 bytes <-> 32 samples */
+
+static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
+{
+    int scale;
+    int i;
+    int s0,s1,s2,d;
+    int max=0;
+    int min=0;
+    int data[32];
+
+    s1 = prev->s1;
+    s2 = prev->s2;
+    for(i=0;i<32;i++) {
+        s0 = wav[i];
+        d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
+        data[i]=d;
+        if (max<d) max=d;
+        if (min>d) min=d;
+        s2 = s1;
+        s1 = s0;
+    }
+    prev->s1 = s1;
+    prev->s2 = s2;
+
+    /* -8..+7 */
+
+    if (max==0 && min==0) {
+        memset(adx,0,18);
+        return;
+    }
+
+    if (max/7>-min/8) scale = max/7;
+    else scale = -min/8;
+
+    if (scale==0) scale=1;
+
+    AV_WB16(adx, scale);
+
+    for(i=0;i<16;i++) {
+        adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
+    }
+}
+
+static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
+{
+#if 0
+    struct {
+        uint32_t offset; /* 0x80000000 + sample start - 4 */
+        unsigned char unknown1[3]; /* 03 12 04 */
+        unsigned char channel; /* 1 or 2 */
+        uint32_t freq;
+        uint32_t size;
+        uint32_t unknown2; /* 01 f4 03 00 */
+        uint32_t unknown3; /* 00 00 00 00 */
+        uint32_t unknown4; /* 00 00 00 00 */
+
+    /* if loop
+        unknown3 00 15 00 01
+        unknown4 00 00 00 01
+        long loop_start_sample;
+        long loop_start_byte;
+        long loop_end_sample;
+        long loop_end_byte;
+        long
+    */
+    } adxhdr; /* big endian */
+    /* offset-6 "(c)CRI" */
+#endif
+    AV_WB32(buf+0x00,0x80000000|0x20);
+    AV_WB32(buf+0x04,0x03120400|avctx->channels);
+    AV_WB32(buf+0x08,avctx->sample_rate);
+    AV_WB32(buf+0x0c,0); /* FIXME: set after */
+    AV_WB32(buf+0x10,0x01040300);
+    AV_WB32(buf+0x14,0x00000000);
+    AV_WB32(buf+0x18,0x00000000);
+    memcpy(buf+0x1c,"\0\0(c)CRI",8);
+    return 0x20+4;
+}
+
+static int adx_encode_init(AVCodecContext *avctx)
+{
+    if (avctx->channels > 2)
+        return -1; /* only stereo or mono =) */
+    avctx->frame_size = 32;
+
+    avctx->coded_frame= avcodec_alloc_frame();
+    avctx->coded_frame->key_frame= 1;
+
+//    avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
+
+    av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
+
+    return 0;
+}
+
+static int adx_encode_close(AVCodecContext *avctx)
+{
+    av_freep(&avctx->coded_frame);
+
+    return 0;
+}
+
+static int adx_encode_frame(AVCodecContext *avctx,
+                uint8_t *frame, int buf_size, void *data)
+{
+    ADXContext *c = avctx->priv_data;
+    const short *samples = data;
+    unsigned char *dst = frame;
+    int rest = avctx->frame_size;
+
+/*
+    input data size =
+    ffmpeg.c: do_audio_out()
+    frame_bytes = enc->frame_size * 2 * enc->channels;
+*/
+
+//    printf("sz=%d ",buf_size); fflush(stdout);
+    if (!c->header_parsed) {
+        int hdrsize = adx_encode_header(avctx,dst,buf_size);
+        dst+=hdrsize;
+        c->header_parsed = 1;
+    }
+
+    if (avctx->channels==1) {
+        while(rest>=32) {
+            adx_encode(dst,samples,c->prev);
+            dst+=18;
+            samples+=32;
+            rest-=32;
+        }
+    } else {
+        while(rest>=32*2) {
+            short tmpbuf[32*2];
+            int i;
+
+            for(i=0;i<32;i++) {
+                tmpbuf[i] = samples[i*2];
+                tmpbuf[i+32] = samples[i*2+1];
+            }
+
+            adx_encode(dst,tmpbuf,c->prev);
+            adx_encode(dst+18,tmpbuf+32,c->prev+1);
+            dst+=18*2;
+            samples+=32*2;
+            rest-=32*2;
+        }
+    }
+    return dst-frame;
+}
+
+AVCodec adpcm_adx_encoder = {
+    "adpcm_adx",
+    CODEC_TYPE_AUDIO,
+    CODEC_ID_ADPCM_ADX,
+    sizeof(ADXContext),
+    adx_encode_init,
+    adx_encode_frame,
+    adx_encode_close,
+    NULL,
+};