#include "libavutil/common.h"
#include "avcodec.h"
#include "celp_filters.h"
+#include "internal.h"
#include "libavutil/lfg.h"
typedef struct CNGContext {
- AVFrame avframe;
float *refl_coef, *target_refl_coef;
float *lpc_coef;
int order;
int energy, target_energy;
+ int inited;
float *filter_out;
float *excitation;
AVLFG lfg;
avctx->channels = 1;
avctx->sample_rate = 8000;
- avcodec_get_frame_defaults(&p->avframe);
- avctx->coded_frame = &p->avframe;
p->order = 12;
avctx->frame_size = 640;
p->refl_coef = av_mallocz(p->order * sizeof(*p->refl_coef));
memcpy(lpc, cur, sizeof(*lpc) * order);
}
-static int cng_decode_frame(AVCodecContext *avctx, void *data,
- int *got_frame_ptr, AVPacket *avpkt)
+static void cng_decode_flush(AVCodecContext *avctx)
{
+ CNGContext *p = avctx->priv_data;
+ p->inited = 0;
+}
+static int cng_decode_frame(AVCodecContext *avctx, void *data,
+ int *got_frame_ptr, AVPacket *avpkt)
+{
+ AVFrame *frame = data;
CNGContext *p = avctx->priv_data;
int buf_size = avpkt->size;
int ret, i;
float scaling;
if (avpkt->size) {
- float dbov = -avpkt->data[0] / 10.0;
- p->target_energy = 1081109975 * pow(10, dbov) * 0.75;
- memset(p->target_refl_coef, 0, sizeof(p->refl_coef));
+ int dbov = -avpkt->data[0];
+ p->target_energy = 1081109975 * pow(10, dbov / 10.0) * 0.75;
+ memset(p->target_refl_coef, 0, p->order * sizeof(*p->target_refl_coef));
for (i = 0; i < FFMIN(avpkt->size - 1, p->order); i++) {
p->target_refl_coef[i] = (avpkt->data[1 + i] - 127) / 128.0;
}
}
- p->energy = p->energy / 2 + p->target_energy / 2;
- for (i = 0; i < p->order; i++)
- p->refl_coef[i] = 0.6 *p->refl_coef[i] + 0.4 * p->target_refl_coef[i];
+ if (p->inited) {
+ p->energy = p->energy / 2 + p->target_energy / 2;
+ for (i = 0; i < p->order; i++)
+ p->refl_coef[i] = 0.6 *p->refl_coef[i] + 0.4 * p->target_refl_coef[i];
+ } else {
+ p->energy = p->target_energy;
+ memcpy(p->refl_coef, p->target_refl_coef, p->order * sizeof(*p->refl_coef));
+ p->inited = 1;
+ }
make_lpc_coefs(p->lpc_coef, p->refl_coef, p->order);
for (i = 0; i < p->order; i++)
ff_celp_lp_synthesis_filterf(p->filter_out + p->order, p->lpc_coef,
p->excitation, avctx->frame_size, p->order);
- p->avframe.nb_samples = avctx->frame_size;
- if ((ret = avctx->get_buffer(avctx, &p->avframe)) < 0) {
+ frame->nb_samples = avctx->frame_size;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
- buf_out = (int16_t *)p->avframe.data[0];
+ buf_out = (int16_t *)frame->data[0];
for (i = 0; i < avctx->frame_size; i++)
buf_out[i] = p->filter_out[i + p->order];
memcpy(p->filter_out, p->filter_out + avctx->frame_size,
p->order * sizeof(*p->filter_out));
- *got_frame_ptr = 1;
- *(AVFrame *)data = p->avframe;
+ *got_frame_ptr = 1;
return buf_size;
}
.priv_data_size = sizeof(CNGContext),
.init = cng_decode_init,
.decode = cng_decode_frame,
+ .flush = cng_decode_flush,
.close = cng_decode_close,
.long_name = NULL_IF_CONFIG_SMALL("RFC 3389 comfort noise generator"),
.sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,