* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/**
+ * @file
+ * LucasArts VIMA audio decoder
+ * @author Paul B Mahol
+ */
+
#include "libavutil/channel_layout.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
#include "adpcm_data.h"
-typedef struct {
- uint16_t predict_table[5786 * 2];
-} VimaContext;
+static int predict_table_init = 0;
+static uint16_t predict_table[5786 * 2];
static const uint8_t size_table[] =
{
static av_cold int decode_init(AVCodecContext *avctx)
{
- VimaContext *vima = avctx->priv_data;
- int start_pos;
+ int start_pos;
+
+ avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+
+ if (predict_table_init)
+ return 0;
for (start_pos = 0; start_pos < 64; start_pos++) {
unsigned int dest_pos, table_pos;
put += table_value;
table_value >>= 1;
}
- vima->predict_table[dest_pos] = put;
+ predict_table[dest_pos] = put;
}
}
-
- avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ predict_table_init = 1;
return 0;
}
int *got_frame_ptr, AVPacket *pkt)
{
GetBitContext gb;
- VimaContext *vima = avctx->priv_data;
AVFrame *frame = data;
int16_t pcm_data[2];
uint32_t samples;
predict_index = (lookup << (7 - lookup_size)) | (step_index << 6);
predict_index = av_clip(predict_index, 0, 5785);
- diff = vima->predict_table[predict_index];
+ diff = predict_table[predict_index];
if (lookup)
diff += ff_adpcm_step_table[step_index] >> (lookup_size - 1);
if (highbit)
.name = "vima",
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_VIMA,
- .priv_data_size = sizeof(VimaContext),
.init = decode_init,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,