*/
#define BITSTREAM_READER_LE
-#include "libavutil/audioconvert.h"
-#include "libavutil/lzo.h"
+#include "libavutil/channel_layout.h"
+#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "get_bits.h"
#include "acelp_vectors.h"
#include "celp_filters.h"
#include "g723_1_data.h"
+#include "internal.h"
+
+#define CNG_RANDOM_SEED 12345
/**
* G723.1 frame types
typedef struct g723_1_context {
AVClass *class;
- AVFrame frame;
G723_1_Subframe subframe[4];
enum FrameType cur_frame_type;
int erased_frames;
int16_t prev_lsp[LPC_ORDER];
+ int16_t sid_lsp[LPC_ORDER];
int16_t prev_excitation[PITCH_MAX];
int16_t excitation[PITCH_MAX + FRAME_LEN + 4];
int16_t synth_mem[LPC_ORDER];
int iir_mem[LPC_ORDER];
int random_seed;
+ int cng_random_seed;
int interp_index;
int interp_gain;
int sid_gain;
int pf_gain;
int postfilter;
- int16_t audio[FRAME_LEN + LPC_ORDER + PITCH_MAX];
+ int16_t audio[FRAME_LEN + LPC_ORDER + PITCH_MAX + 4];
} G723_1_Context;
static av_cold int g723_1_decode_init(AVCodecContext *avctx)
avctx->sample_rate = 8000;
p->pf_gain = 1 << 12;
- avcodec_get_frame_defaults(&p->frame);
- avctx->coded_frame = &p->frame;
-
memcpy(p->prev_lsp, dc_lsp, LPC_ORDER * sizeof(*p->prev_lsp));
+ memcpy(p->sid_lsp, dc_lsp, LPC_ORDER * sizeof(*p->sid_lsp));
+
+ p->cng_random_seed = CNG_RANDOM_SEED;
+ p->past_frame_type = SID_FRAME;
return 0;
}
max = FFMIN(max, 0x7FFF);
bits = normalize_bits(max, 15);
- if (bits == 15)
- for (i = 0; i < length; i++)
- dst[i] = vector[i] * 0x7fff >> 3;
- else
- for (i = 0; i < length; i++)
- dst[i] = vector[i] << bits >> 3;
+ for (i = 0; i < length; i++)
+ dst[i] = vector[i] << bits >> 3;
return bits - 3;
}
}
}
+static int sid_gain_to_lsp_index(int gain)
+{
+ if (gain < 0x10)
+ return gain << 6;
+ else if (gain < 0x20)
+ return gain - 8 << 7;
+ else
+ return gain - 20 << 8;
+}
+
+static inline int cng_rand(int *state, int base)
+{
+ *state = (*state * 521 + 259) & 0xFFFF;
+ return (*state & 0x7FFF) * base >> 15;
+}
+
+static int estimate_sid_gain(G723_1_Context *p)
+{
+ int i, shift, seg, seg2, t, val, val_add, x, y;
+
+ shift = 16 - p->cur_gain * 2;
+ if (shift > 0)
+ t = p->sid_gain << shift;
+ else
+ t = p->sid_gain >> -shift;
+ x = t * cng_filt[0] >> 16;
+
+ if (x >= cng_bseg[2])
+ return 0x3F;
+
+ if (x >= cng_bseg[1]) {
+ shift = 4;
+ seg = 3;
+ } else {
+ shift = 3;
+ seg = (x >= cng_bseg[0]);
+ }
+ seg2 = FFMIN(seg, 3);
+
+ val = 1 << shift;
+ val_add = val >> 1;
+ for (i = 0; i < shift; i++) {
+ t = seg * 32 + (val << seg2);
+ t *= t;
+ if (x >= t)
+ val += val_add;
+ else
+ val -= val_add;
+ val_add >>= 1;
+ }
+
+ t = seg * 32 + (val << seg2);
+ y = t * t - x;
+ if (y <= 0) {
+ t = seg * 32 + (val + 1 << seg2);
+ t = t * t - x;
+ val = (seg2 - 1 << 4) + val;
+ if (t >= y)
+ val++;
+ } else {
+ t = seg * 32 + (val - 1 << seg2);
+ t = t * t - x;
+ val = (seg2 - 1 << 4) + val;
+ if (t >= y)
+ val--;
+ }
+
+ return val;
+}
+
+static void generate_noise(G723_1_Context *p)
+{
+ int i, j, idx, t;
+ int off[SUBFRAMES];
+ int signs[SUBFRAMES / 2 * 11], pos[SUBFRAMES / 2 * 11];
+ int tmp[SUBFRAME_LEN * 2];
+ int16_t *vector_ptr;
+ int64_t sum;
+ int b0, c, delta, x, shift;
+
+ p->pitch_lag[0] = cng_rand(&p->cng_random_seed, 21) + 123;
+ p->pitch_lag[1] = cng_rand(&p->cng_random_seed, 19) + 123;
+
+ for (i = 0; i < SUBFRAMES; i++) {
+ p->subframe[i].ad_cb_gain = cng_rand(&p->cng_random_seed, 50) + 1;
+ p->subframe[i].ad_cb_lag = cng_adaptive_cb_lag[i];
+ }
+
+ for (i = 0; i < SUBFRAMES / 2; i++) {
+ t = cng_rand(&p->cng_random_seed, 1 << 13);
+ off[i * 2] = t & 1;
+ off[i * 2 + 1] = ((t >> 1) & 1) + SUBFRAME_LEN;
+ t >>= 2;
+ for (j = 0; j < 11; j++) {
+ signs[i * 11 + j] = (t & 1) * 2 - 1 << 14;
+ t >>= 1;
+ }
+ }
+
+ idx = 0;
+ for (i = 0; i < SUBFRAMES; i++) {
+ for (j = 0; j < SUBFRAME_LEN / 2; j++)
+ tmp[j] = j;
+ t = SUBFRAME_LEN / 2;
+ for (j = 0; j < pulses[i]; j++, idx++) {
+ int idx2 = cng_rand(&p->cng_random_seed, t);
+
+ pos[idx] = tmp[idx2] * 2 + off[i];
+ tmp[idx2] = tmp[--t];
+ }
+ }
+
+ vector_ptr = p->audio + LPC_ORDER;
+ memcpy(vector_ptr, p->prev_excitation,
+ PITCH_MAX * sizeof(*p->excitation));
+ for (i = 0; i < SUBFRAMES; i += 2) {
+ gen_acb_excitation(vector_ptr, vector_ptr,
+ p->pitch_lag[i >> 1], &p->subframe[i],
+ p->cur_rate);
+ gen_acb_excitation(vector_ptr + SUBFRAME_LEN,
+ vector_ptr + SUBFRAME_LEN,
+ p->pitch_lag[i >> 1], &p->subframe[i + 1],
+ p->cur_rate);
+
+ t = 0;
+ for (j = 0; j < SUBFRAME_LEN * 2; j++)
+ t |= FFABS(vector_ptr[j]);
+ t = FFMIN(t, 0x7FFF);
+ if (!t) {
+ shift = 0;
+ } else {
+ shift = -10 + av_log2(t);
+ if (shift < -2)
+ shift = -2;
+ }
+ sum = 0;
+ if (shift < 0) {
+ for (j = 0; j < SUBFRAME_LEN * 2; j++) {
+ t = vector_ptr[j] << -shift;
+ sum += t * t;
+ tmp[j] = t;
+ }
+ } else {
+ for (j = 0; j < SUBFRAME_LEN * 2; j++) {
+ t = vector_ptr[j] >> shift;
+ sum += t * t;
+ tmp[j] = t;
+ }
+ }
+
+ b0 = 0;
+ for (j = 0; j < 11; j++)
+ b0 += tmp[pos[(i / 2) * 11 + j]] * signs[(i / 2) * 11 + j];
+ b0 = b0 * 2 * 2979LL + (1 << 29) >> 30; // approximated division by 11
+
+ c = p->cur_gain * (p->cur_gain * SUBFRAME_LEN >> 5);
+ if (shift * 2 + 3 >= 0)
+ c >>= shift * 2 + 3;
+ else
+ c <<= -(shift * 2 + 3);
+ c = (av_clipl_int32(sum << 1) - c) * 2979LL >> 15;
+
+ delta = b0 * b0 * 2 - c;
+ if (delta <= 0) {
+ x = -b0;
+ } else {
+ delta = square_root(delta);
+ x = delta - b0;
+ t = delta + b0;
+ if (FFABS(t) < FFABS(x))
+ x = -t;
+ }
+ shift++;
+ if (shift < 0)
+ x >>= -shift;
+ else
+ x <<= shift;
+ x = av_clip(x, -10000, 10000);
+
+ for (j = 0; j < 11; j++) {
+ idx = (i / 2) * 11 + j;
+ vector_ptr[pos[idx]] = av_clip_int16(vector_ptr[pos[idx]] +
+ (x * signs[idx] >> 15));
+ }
+
+ /* copy decoded data to serve as a history for the next decoded subframes */
+ memcpy(vector_ptr + PITCH_MAX, vector_ptr,
+ sizeof(*vector_ptr) * SUBFRAME_LEN * 2);
+ vector_ptr += SUBFRAME_LEN * 2;
+ }
+ /* Save the excitation for the next frame */
+ memcpy(p->prev_excitation, p->audio + LPC_ORDER + FRAME_LEN,
+ PITCH_MAX * sizeof(*p->excitation));
+}
+
static int g723_1_decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt)
{
G723_1_Context *p = avctx->priv_data;
+ AVFrame *frame = data;
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
int dec_mode = buf[0] & 3;
p->cur_frame_type = UNTRANSMITTED_FRAME;
}
- p->frame.nb_samples = FRAME_LEN;
- if ((ret = avctx->get_buffer(avctx, &p->frame)) < 0) {
+ frame->nb_samples = FRAME_LEN;
+ if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
- out = (int16_t *)p->frame.data[0];
+ out = (int16_t *)frame->data[0];
if (p->cur_frame_type == ACTIVE_FRAME) {
if (!bad_frame)
(FRAME_LEN + PITCH_MAX) * sizeof(*p->excitation));
memset(p->prev_excitation, 0,
PITCH_MAX * sizeof(*p->excitation));
- memset(p->frame.data[0], 0,
+ memset(frame->data[0], 0,
(FRAME_LEN + LPC_ORDER) * sizeof(int16_t));
} else {
int16_t *buf = p->audio + LPC_ORDER;
PITCH_MAX * sizeof(*p->excitation));
}
}
+ p->cng_random_seed = CNG_RANDOM_SEED;
} else {
- memset(out, 0, FRAME_LEN * 2);
- av_log(avctx, AV_LOG_WARNING,
- "G.723.1: Comfort noise generation not supported yet\n");
+ if (p->cur_frame_type == SID_FRAME) {
+ p->sid_gain = sid_gain_to_lsp_index(p->subframe[0].amp_index);
+ inverse_quant(p->sid_lsp, p->prev_lsp, p->lsp_index, 0);
+ } else if (p->past_frame_type == ACTIVE_FRAME) {
+ p->sid_gain = estimate_sid_gain(p);
+ }
- *got_frame_ptr = 1;
- *(AVFrame *)data = p->frame;
- return frame_size[dec_mode];
+ if (p->past_frame_type == ACTIVE_FRAME)
+ p->cur_gain = p->sid_gain;
+ else
+ p->cur_gain = (p->cur_gain * 7 + p->sid_gain) >> 3;
+ generate_noise(p);
+ lsp_interpolate(lpc, p->sid_lsp, p->prev_lsp);
+ /* Save the lsp_vector for the next frame */
+ memcpy(p->prev_lsp, p->sid_lsp, LPC_ORDER * sizeof(*p->prev_lsp));
}
p->past_frame_type = p->cur_frame_type;
out[i] = av_clip_int16(p->audio[LPC_ORDER + i] << 1);
}
- *got_frame_ptr = 1;
- *(AVFrame *)data = p->frame;
+ *got_frame_ptr = 1;
return frame_size[dec_mode];
}
static const AVOption options[] = {
{ "postfilter", "postfilter on/off", OFFSET(postfilter), AV_OPT_TYPE_INT,
- { 1 }, 0, 1, AD },
+ { .i64 = 1 }, 0, 1, AD },
{ NULL }
};
AVCodec ff_g723_1_decoder = {
.name = "g723_1",
+ .long_name = NULL_IF_CONFIG_SMALL("G.723.1"),
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_G723_1,
.priv_data_size = sizeof(G723_1_Context),
.init = g723_1_decode_init,
.decode = g723_1_decode_frame,
- .long_name = NULL_IF_CONFIG_SMALL("G.723.1"),
- .capabilities = CODEC_CAP_SUBFRAMES,
+ .capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
.priv_class = &g723_1dec_class,
};
projects / ffmpeg / blobdiff