EA IMA SEAD decoder

original patch by Peter Ross

Originally committed as revision 10879 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/Makefile

@@ -276,6 +276,7 @@ OBJS-$(CONFIG_ADPCM_IMA_DK3_DECODER)   += adpcm.o
 OBJS-$(CONFIG_ADPCM_IMA_DK3_ENCODER)   += adpcm.o
 OBJS-$(CONFIG_ADPCM_IMA_DK4_DECODER)   += adpcm.o
 OBJS-$(CONFIG_ADPCM_IMA_DK4_ENCODER)   += adpcm.o
+OBJS-$(CONFIG_ADPCM_IMA_EA_SEAD_DECODER) += adpcm.o
 OBJS-$(CONFIG_ADPCM_IMA_QT_DECODER)    += adpcm.o
 OBJS-$(CONFIG_ADPCM_IMA_QT_ENCODER)    += adpcm.o
 OBJS-$(CONFIG_ADPCM_IMA_SMJPEG_DECODER) += adpcm.o

libavcodec/adpcm.c

@@ -31,6 +31,7 @@
  * CD-ROM XA ADPCM codec by BERO
  * EA ADPCM decoder by Robin Kay (komadori@myrealbox.com)
  * EA ADPCM R1/R2/R3 decoder by Peter Ross (pross@xvid.org)
+ * EA IMA SEAD decoder by Peter Ross (pross@xvid.org)
  * THP ADPCM decoder by Marco Gerards (mgerards@xs4all.nl)
  *
  * Features and limitations:
@@ -1137,6 +1138,12 @@ static int adpcm_decode_frame(AVCodecContext *avctx,
             buf_size -= 128;
         }
         break;
+    case CODEC_ID_ADPCM_IMA_EA_SEAD:
+        for (; src < buf+buf_size; src++) {
+            *samples++ = adpcm_ima_expand_nibble(&c->status[0], src[0] >> 4, 6);
+            *samples++ = adpcm_ima_expand_nibble(&c->status[st],src[0]&0x0F, 6);
+        }
+        break;
     case CODEC_ID_ADPCM_EA:
         samples_in_chunk = AV_RL32(src);
         if (samples_in_chunk >= ((buf_size - 12) * 2)) {
@@ -1535,6 +1542,7 @@ ADPCM_CODEC(CODEC_ID_ADPCM_EA, adpcm_ea);
 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_AMV, adpcm_ima_amv);
 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK3, adpcm_ima_dk3);
 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_DK4, adpcm_ima_dk4);
+ADPCM_CODEC(CODEC_ID_ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead);
 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);
 ADPCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);

libavcodec/allcodecs.c

@@ -254,6 +254,7 @@ void avcodec_register_all(void)
     REGISTER_DECODER (ADPCM_IMA_AMV, adpcm_ima_amv);
     REGISTER_ENCDEC  (ADPCM_IMA_DK3, adpcm_ima_dk3);
     REGISTER_ENCDEC  (ADPCM_IMA_DK4, adpcm_ima_dk4);
+    REGISTER_DECODER (ADPCM_IMA_EA_SEAD, adpcm_ima_ea_sead);
     REGISTER_ENCDEC  (ADPCM_IMA_QT, adpcm_ima_qt);
     REGISTER_ENCDEC  (ADPCM_IMA_SMJPEG, adpcm_ima_smjpeg);
     REGISTER_ENCDEC  (ADPCM_IMA_WAV, adpcm_ima_wav);

libavcodec/avcodec.h

@@ -33,8 +33,8 @@
 #define AV_STRINGIFY(s)         AV_TOSTRING(s)
 #define AV_TOSTRING(s) #s
 
-#define LIBAVCODEC_VERSION_INT  ((51<<16)+(47<<8)+1)
+#define LIBAVCODEC_VERSION_INT  ((51<<16)+(47<<8)+2)
-#define LIBAVCODEC_VERSION      51.47.1
+#define LIBAVCODEC_VERSION      51.47.2
 #define LIBAVCODEC_BUILD        LIBAVCODEC_VERSION_INT
 
 #define LIBAVCODEC_IDENT        "Lavc" AV_STRINGIFY(LIBAVCODEC_VERSION)
@@ -214,6 +214,7 @@ enum CodecID {
     CODEC_ID_ADPCM_EA_R1,
     CODEC_ID_ADPCM_EA_R3,
     CODEC_ID_ADPCM_EA_R2,
+    CODEC_ID_ADPCM_IMA_EA_SEAD,
 
     /* AMR */
     CODEC_ID_AMR_NB= 0x12000,

libavformat/electronicarts.c

@@ -27,6 +27,9 @@
 #include "avformat.h"
 
 #define SCHl_TAG MKTAG('S', 'C', 'H', 'l')
+#define SEAD_TAG MKTAG('S', 'E', 'A', 'D')    /* Sxxx header */
+#define SNDC_TAG MKTAG('S', 'N', 'D', 'C')    /* Sxxx data */
+#define SEND_TAG MKTAG('S', 'E', 'N', 'D')    /* Sxxx end */
 #define ISNh_TAG MKTAG('1', 'S', 'N', 'h')    /* 1SNx header */
 #define EACS_TAG MKTAG('E', 'A', 'C', 'S')
 #define ISNd_TAG MKTAG('1', 'S', 'N', 'd')    /* 1SNx data */
@@ -205,6 +208,23 @@ static int process_audio_header_eacs(AVFormatContext *s)
     return 1;
 }
 
+/*
+ * Process SEAD sound header
+ * return 1 if success, 0 if invalid format, otherwise AVERROR_xxx
+ */
+static int process_audio_header_sead(AVFormatContext *s)
+{
+    EaDemuxContext *ea = s->priv_data;
+    ByteIOContext *pb = &s->pb;
+
+    ea->sample_rate  = get_le32(pb);
+    ea->bytes        = get_le32(pb);  /* 1=8-bit, 2=16-bit */
+    ea->num_channels = get_le32(pb);
+    ea->audio_codec  = CODEC_ID_ADPCM_IMA_EA_SEAD;
+
+    return 1;
+}
+
 static int process_video_header_vp6(AVFormatContext *s)
 {
     EaDemuxContext *ea = s->priv_data;
@@ -259,6 +279,10 @@ static int process_ea_header(AVFormatContext *s) {
                 err = process_audio_header_elements(s);
                 break;
 
+            case SEAD_TAG:
+                err = process_audio_header_sead(s);
+                break;
+
             case MVhd_TAG :
                 err = process_video_header_vp6(s);
                 break;
@@ -283,6 +307,7 @@ static int ea_probe(AVProbeData *p)
     switch (AV_RL32(&p->buf[0])) {
     case ISNh_TAG:
     case SCHl_TAG:
+    case SEAD_TAG:
     case MVhd_TAG:
         return AVPROBE_SCORE_MAX;
     }
@@ -354,6 +379,7 @@ static int ea_read_packet(AVFormatContext *s,
             chunk_size -= 32;
         case ISNd_TAG:
         case SCDl_TAG:
+        case SNDC_TAG:
             if (!ea->audio_codec) {
                 url_fskip(pb, chunk_size);
                 break;
@@ -387,6 +413,7 @@ static int ea_read_packet(AVFormatContext *s,
         case 0:
         case ISNe_TAG:
         case SCEl_TAG:
+        case SEND_TAG:
             ret = AVERROR(EIO);
             packet_read = 1;
             break;