/*
* G.726 ADPCM audio codec
- * Copyright (c) 2004 Roman Shaposhnik.
+ * Copyright (c) 2004 Roman Shaposhnik
*
* This is a very straightforward rendition of the G.726
* Section 4 "Computational Details".
*/
#include <limits.h>
#include "avcodec.h"
-#include "bitstream.h"
+#include "get_bits.h"
+#include "put_bits.h"
/**
* G.726 11bit float.
c->td = c->a[1] < -11776;
/* Update Ap */
- c->dms += ((c->tbls.F[I]<<9) - c->dms) >> 5;
- c->dml += ((c->tbls.F[I]<<11) - c->dml) >> 7;
+ c->dms += (c->tbls.F[I]<<4) + ((- c->dms) >> 5);
+ c->dml += (c->tbls.F[I]<<4) + ((- c->dml) >> 7);
if (tr)
c->ap = 256;
- else if (c->y > 1535 && !c->td && abs((c->dms << 2) - c->dml) < (c->dml >> 3))
+ else {
c->ap += (-c->ap) >> 4;
- else
- c->ap += (0x200 - c->ap) >> 4;
+ if (c->y <= 1535 || c->td || abs((c->dms << 2) - c->dml) >= (c->dml >> 3))
+ c->ap += 0x20;
+ }
/* Update Yu and Yl */
c->yu = av_clip(c->y + c->tbls.W[I] + ((-c->y)>>5), 544, 5120);
return 0;
}
-#ifdef CONFIG_ENCODERS
+#if CONFIG_ADPCM_G726_ENCODER
static int16_t g726_encode(G726Context* c, int16_t sig)
{
uint8_t i;
static av_cold int g726_init(AVCodecContext * avctx)
{
G726Context* c = avctx->priv_data;
- unsigned int index= (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate - 2;
+ unsigned int index;
+
+ if (avctx->sample_rate <= 0) {
+ av_log(avctx, AV_LOG_ERROR, "Samplerate is invalid\n");
+ return -1;
+ }
+
+ index = (avctx->bit_rate + avctx->sample_rate/2) / avctx->sample_rate - 2;
if (avctx->bit_rate % avctx->sample_rate && avctx->codec->encode) {
av_log(avctx, AV_LOG_ERROR, "Bitrate - Samplerate combination is invalid\n");
return AVERROR(ENOMEM);
avctx->coded_frame->key_frame = 1;
+ if (avctx->codec->decode)
+ avctx->sample_fmt = SAMPLE_FMT_S16;
+
return 0;
}
return 0;
}
-#ifdef CONFIG_ENCODERS
+#if CONFIG_ADPCM_G726_ENCODER
static int g726_encode_frame(AVCodecContext *avctx,
uint8_t *dst, int buf_size, void *data)
{
static int g726_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;
G726Context *c = avctx->priv_data;
short *samples = data;
GetBitContext gb;
return buf_size;
}
-#ifdef CONFIG_ENCODERS
+#if CONFIG_ADPCM_G726_ENCODER
AVCodec adpcm_g726_encoder = {
"g726",
CODEC_TYPE_AUDIO,
g726_encode_frame,
g726_close,
NULL,
+ .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
.long_name = NULL_IF_CONFIG_SMALL("G.726 ADPCM"),
};
-#endif //CONFIG_ENCODERS
+#endif
AVCodec adpcm_g726_decoder = {
"g726",