* implementors. The original code is available from http://code.google.com/p/nelly2pcm/
*/
-#include "nellymoser.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/float_dsp.h"
#include "libavutil/lfg.h"
#include "libavutil/random_seed.h"
-#include "libavutil/audioconvert.h"
#include "avcodec.h"
-#include "dsputil.h"
#include "fft.h"
-#include "fmtconvert.h"
+#include "internal.h"
+#include "nellymoser.h"
#include "sinewin.h"
-#define ALT_BITSTREAM_READER_LE
+#define BITSTREAM_READER_LE
#include "get_bits.h"
typedef struct NellyMoserDecodeContext {
AVCodecContext* avctx;
- DECLARE_ALIGNED(32, float, float_buf)[NELLY_SAMPLES];
- float state[128];
AVLFG random_state;
GetBitContext gb;
float scale_bias;
- DSPContext dsp;
+ AVFloatDSPContext fdsp;
FFTContext imdct_ctx;
- FmtConvertContext fmt_conv;
- DECLARE_ALIGNED(32, float, imdct_out)[NELLY_BUF_LEN * 2];
+ DECLARE_ALIGNED(32, float, imdct_buf)[2][NELLY_BUF_LEN];
+ float *imdct_out;
+ float *imdct_prev;
} NellyMoserDecodeContext;
-static void overlap_and_window(NellyMoserDecodeContext *s, float *state, float *audio, float *a_in)
-{
- int bot, top;
-
- bot = 0;
- top = NELLY_BUF_LEN-1;
-
- while (bot < NELLY_BUF_LEN) {
- audio[bot] = a_in [bot]*ff_sine_128[bot]
- +state[bot]*ff_sine_128[top];
-
- bot++;
- top--;
- }
- memcpy(state, a_in + NELLY_BUF_LEN, sizeof(float)*NELLY_BUF_LEN);
-}
-
static void nelly_decode_block(NellyMoserDecodeContext *s,
const unsigned char block[NELLY_BLOCK_LEN],
float audio[NELLY_SAMPLES])
memset(&aptr[NELLY_FILL_LEN], 0,
(NELLY_BUF_LEN - NELLY_FILL_LEN) * sizeof(float));
- s->imdct_ctx.imdct_calc(&s->imdct_ctx, s->imdct_out, aptr);
- /* XXX: overlapping and windowing should be part of a more
- generic imdct function */
- overlap_and_window(s, s->state, aptr, s->imdct_out);
+ s->imdct_ctx.imdct_half(&s->imdct_ctx, s->imdct_out, aptr);
+ s->fdsp.vector_fmul_window(aptr, s->imdct_prev + NELLY_BUF_LEN / 2,
+ s->imdct_out, ff_sine_128,
+ NELLY_BUF_LEN / 2);
+ FFSWAP(float *, s->imdct_out, s->imdct_prev);
}
}
NellyMoserDecodeContext *s = avctx->priv_data;
s->avctx = avctx;
+ s->imdct_out = s->imdct_buf[0];
+ s->imdct_prev = s->imdct_buf[1];
av_lfg_init(&s->random_state, 0);
ff_mdct_init(&s->imdct_ctx, 8, 1, 1.0);
- dsputil_init(&s->dsp, avctx);
- ff_fmt_convert_init(&s->fmt_conv, avctx);
+ avpriv_float_dsp_init(&s->fdsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
- s->scale_bias = 1.0/(1*8);
+ s->scale_bias = 1.0/(32768*8);
+ avctx->sample_fmt = AV_SAMPLE_FMT_FLT;
/* Generate overlap window */
if (!ff_sine_128[127])
ff_init_ff_sine_windows(7);
- avctx->sample_fmt = AV_SAMPLE_FMT_S16;
+ avctx->channels = 1;
avctx->channel_layout = AV_CH_LAYOUT_MONO;
+
return 0;
}
-static int decode_tag(AVCodecContext * avctx,
- void *data, int *data_size,
- AVPacket *avpkt) {
+static int decode_tag(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
NellyMoserDecodeContext *s = avctx->priv_data;
- int blocks, i, block_size;
- int16_t* samples;
- samples = (int16_t*)data;
-
- if (buf_size < avctx->block_align) {
- *data_size = 0;
- return buf_size;
- }
+ int blocks, i, ret;
+ float *samples_flt;
- if (buf_size % 64) {
- av_log(avctx, AV_LOG_ERROR, "Tag size %d.\n", buf_size);
- *data_size = 0;
- return buf_size;
- }
- block_size = NELLY_SAMPLES * av_get_bytes_per_sample(avctx->sample_fmt);
- blocks = FFMIN(buf_size / 64, *data_size / block_size);
+ blocks = buf_size / NELLY_BLOCK_LEN;
if (blocks <= 0) {
- av_log(avctx, AV_LOG_ERROR, "Output buffer is too small\n");
- return AVERROR(EINVAL);
+ av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if (buf_size % NELLY_BLOCK_LEN) {
+ av_log(avctx, AV_LOG_WARNING, "Leftover bytes: %d.\n",
+ buf_size % NELLY_BLOCK_LEN);
}
/* Normal numbers of blocks for sample rates:
* 8000 Hz - 1
* 44100 Hz - 8
*/
+ /* get output buffer */
+ frame->nb_samples = NELLY_SAMPLES * blocks;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
+ }
+ samples_flt = (float *)frame->data[0];
+
for (i=0 ; i<blocks ; i++) {
- nelly_decode_block(s, &buf[i*NELLY_BLOCK_LEN], s->float_buf);
- s->fmt_conv.float_to_int16(&samples[i*NELLY_SAMPLES], s->float_buf, NELLY_SAMPLES);
+ nelly_decode_block(s, buf, samples_flt);
+ samples_flt += NELLY_SAMPLES;
+ buf += NELLY_BLOCK_LEN;
}
- *data_size = blocks * block_size;
+
+ *got_frame_ptr = 1;
return buf_size;
}
NellyMoserDecodeContext *s = avctx->priv_data;
ff_mdct_end(&s->imdct_ctx);
+
return 0;
}
AVCodec ff_nellymoser_decoder = {
.name = "nellymoser",
+ .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
.type = AVMEDIA_TYPE_AUDIO,
- .id = CODEC_ID_NELLYMOSER,
+ .id = AV_CODEC_ID_NELLYMOSER,
.priv_data_size = sizeof(NellyMoserDecodeContext),
.init = decode_init,
.close = decode_end,
.decode = decode_tag,
- .long_name = NULL_IF_CONFIG_SMALL("Nellymoser Asao"),
+ .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_PARAM_CHANGE,
+ .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_FLT,
+ AV_SAMPLE_FMT_NONE },
};
-
projects / ffmpeg / blobdiff