*/
/**
- * @file imc.c IMC - Intel Music Coder
+ * @file libavcodec/imc.c IMC - Intel Music Coder
* A mdct based codec using a 256 points large transform
* divied into 32 bands with some mix of scale factors.
* Only mono is supported.
#define ALT_BITSTREAM_READER
#include "avcodec.h"
-#include "bitstream.h"
+#include "get_bits.h"
#include "dsputil.h"
#include "imcdata.h"
int codewords[COEFFS]; ///< raw codewords read from bitstream
float sqrt_tab[30];
GetBitContext gb;
- VLC huffman_vlc[4][4];
int decoder_reset;
float one_div_log2;
DECLARE_ALIGNED_16(float, out_samples[COEFFS]);
} IMCContext;
+static VLC huffman_vlc[4][4];
-static int imc_decode_init(AVCodecContext * avctx)
+#define VLC_TABLES_SIZE 9512
+
+static const int vlc_offsets[17] = {
+ 0, 640, 1156, 1732, 2308, 2852, 3396, 3924,
+ 4452, 5220, 5860, 6628, 7268, 7908, 8424, 8936, VLC_TABLES_SIZE};
+
+static VLC_TYPE vlc_tables[VLC_TABLES_SIZE][2];
+
+static av_cold int imc_decode_init(AVCodecContext * avctx)
{
int i, j;
IMCContext *q = avctx->priv_data;
q->old_floor[i] = 1.0;
/* Build mdct window, a simple sine window normalized with sqrt(2) */
+ ff_sine_window_init(q->mdct_sine_window, COEFFS);
for(i = 0; i < COEFFS; i++)
- q->mdct_sine_window[i] = sin((i + 0.5) / 512.0 * M_PI) * sqrt(2.0);
+ q->mdct_sine_window[i] *= sqrt(2.0);
for(i = 0; i < COEFFS/2; i++){
q->post_cos[i] = cos(i / 256.0 * M_PI);
q->post_sin[i] = sin(i / 256.0 * M_PI);
/* initialize the VLC tables */
for(i = 0; i < 4 ; i++) {
for(j = 0; j < 4; j++) {
- init_vlc (&q->huffman_vlc[i][j], 9, imc_huffman_sizes[i],
+ huffman_vlc[i][j].table = &vlc_tables[vlc_offsets[i * 4 + j]];
+ huffman_vlc[i][j].table_allocated = vlc_offsets[i * 4 + j + 1] - vlc_offsets[i * 4 + j];
+ init_vlc(&huffman_vlc[i][j], 9, imc_huffman_sizes[i],
imc_huffman_lens[i][j], 1, 1,
- imc_huffman_bits[i][j], 2, 2, 1);
+ imc_huffman_bits[i][j], 2, 2, INIT_VLC_USE_NEW_STATIC);
}
}
q->one_div_log2 = 1/log(2);
ff_fft_init(&q->fft, 7, 1);
dsputil_init(&q->dsp, avctx);
+ avctx->sample_fmt = SAMPLE_FMT_S16;
+ avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
return 0;
}
int s;
s = stream_format_code >> 1;
- hufftab[0] = &q->huffman_vlc[s][0];
- hufftab[1] = &q->huffman_vlc[s][1];
- hufftab[2] = &q->huffman_vlc[s][2];
- hufftab[3] = &q->huffman_vlc[s][3];
+ hufftab[0] = &huffman_vlc[s][0];
+ hufftab[1] = &huffman_vlc[s][1];
+ hufftab[2] = &huffman_vlc[s][2];
+ hufftab[3] = &huffman_vlc[s][3];
cb_sel = imc_cb_select[s];
if(stream_format_code & 4)
static int imc_decode_frame(AVCodecContext * avctx,
void *data, int *data_size,
- const uint8_t * buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
IMCContext *q = avctx->priv_data;
int counter, bitscount;
uint16_t buf16[IMC_BLOCK_SIZE / 2];
+ if (buf_size < IMC_BLOCK_SIZE) {
+ av_log(avctx, AV_LOG_ERROR, "imc frame too small!\n");
+ return -1;
+ }
for(i = 0; i < IMC_BLOCK_SIZE / 2; i++)
buf16[i] = bswap_16(((const uint16_t*)buf)[i]);
}
-static int imc_decode_close(AVCodecContext * avctx)
+static av_cold int imc_decode_close(AVCodecContext * avctx)
{
IMCContext *q = avctx->priv_data;
.init = imc_decode_init,
.close = imc_decode_close,
.decode = imc_decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("IMC (Intel Music Coder)"),
};