*/
#define CONFIG_AC3ENC_FLOAT 1
-#include "ac3enc.c"
+#include "internal.h"
+#include "ac3enc.h"
+#include "eac3enc.h"
+#include "kbdwin.h"
+
+
+#if CONFIG_AC3_ENCODER
+#define AC3ENC_TYPE AC3ENC_TYPE_AC3
+#include "ac3enc_opts_template.c"
+static const AVClass ac3enc_class = { "AC-3 Encoder", av_default_item_name,
+ ac3_options, LIBAVUTIL_VERSION_INT };
+#endif
+
+#include "ac3enc_template.c"
/**
* Finalize MDCT and free allocated memory.
+ *
+ * @param s AC-3 encoder private context
*/
-static av_cold void mdct_end(AC3MDCTContext *mdct)
+av_cold void ff_ac3_float_mdct_end(AC3EncodeContext *s)
{
- ff_mdct_end(&mdct->fft);
- av_freep(&mdct->window);
+ ff_mdct_end(&s->mdct);
+ av_freep(&s->mdct_window);
}
/**
* Initialize MDCT tables.
- * @param nbits log2(MDCT size)
+ *
+ * @param s AC-3 encoder private context
+ * @return 0 on success, negative error code on failure
*/
-static av_cold int mdct_init(AVCodecContext *avctx, AC3MDCTContext *mdct,
- int nbits)
+av_cold int ff_ac3_float_mdct_init(AC3EncodeContext *s)
{
float *window;
int i, n, n2;
- n = 1 << nbits;
+ n = 1 << 9;
n2 = n >> 1;
window = av_malloc(n * sizeof(*window));
if (!window) {
- av_log(avctx, AV_LOG_ERROR, "Cannot allocate memory.\n");
+ av_log(s->avctx, AV_LOG_ERROR, "Cannot allocate memory.\n");
return AVERROR(ENOMEM);
}
ff_kbd_window_init(window, 5.0, n2);
for (i = 0; i < n2; i++)
window[n-1-i] = window[i];
- mdct->window = window;
+ s->mdct_window = window;
- return ff_mdct_init(&mdct->fft, nbits, 0, -2.0 / n);
+ return ff_mdct_init(&s->mdct, 9, 0, -2.0 / n);
}
-/**
- * Calculate a 512-point MDCT
- * @param out 256 output frequency coefficients
- * @param in 512 windowed input audio samples
- */
-static void mdct512(AC3MDCTContext *mdct, float *out, float *in)
-{
- mdct->fft.mdct_calc(&mdct->fft, out, in);
-}
-
-
-/**
+/*
* Apply KBD window to input samples prior to MDCT.
*/
-static void apply_window(DSPContext *dsp, float *output, const float *input,
- const float *window, int n)
+static void apply_window(void *dsp, float *output,
+ const float *input, const float *window,
+ unsigned int len)
{
- dsp->vector_fmul(output, input, window, n);
+ AVFloatDSPContext *fdsp = dsp;
+ fdsp->vector_fmul(output, input, window, len);
}
-/**
- * Normalize the input samples to use the maximum available precision.
+/*
+ * Normalize the input samples.
+ * Not needed for the floating-point encoder.
*/
static int normalize_samples(AC3EncodeContext *s)
{
- /* Normalization is not needed for floating-point samples, so just return 0 */
return 0;
}
-/**
+/*
* Scale MDCT coefficients from float to 24-bit fixed-point.
*/
static void scale_coefficients(AC3EncodeContext *s)
{
- s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer, s->mdct_coef_buffer,
- AC3_MAX_COEFS * AC3_MAX_BLOCKS * s->channels);
+ int chan_size = AC3_MAX_COEFS * s->num_blocks;
+ int cpl = s->cpl_on;
+ s->ac3dsp.float_to_fixed24(s->fixed_coef_buffer + (chan_size * !cpl),
+ s->mdct_coef_buffer + (chan_size * !cpl),
+ chan_size * (s->channels + cpl));
+}
+
+
+/*
+ * Clip MDCT coefficients to allowable range.
+ */
+static void clip_coefficients(DSPContext *dsp, float *coef, unsigned int len)
+{
+ dsp->vector_clipf(coef, coef, COEF_MIN, COEF_MAX, len);
+}
+
+
+/*
+ * Calculate a single coupling coordinate.
+ */
+static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
+{
+ float coord = 0.125;
+ if (energy_cpl > 0)
+ coord *= sqrtf(energy_ch / energy_cpl);
+ return FFMIN(coord, COEF_MAX);
}
+#if CONFIG_AC3_ENCODER
AVCodec ff_ac3_encoder = {
- "ac3",
- AVMEDIA_TYPE_AUDIO,
- CODEC_ID_AC3,
- sizeof(AC3EncodeContext),
- ac3_encode_init,
- ac3_encode_frame,
- ac3_encode_close,
- NULL,
- .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_FLT,AV_SAMPLE_FMT_NONE},
- .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
- .channel_layouts = ac3_channel_layouts,
+ .name = "ac3",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_AC3,
+ .priv_data_size = sizeof(AC3EncodeContext),
+ .init = ff_ac3_encode_init,
+ .encode2 = ff_ac3_float_encode_frame,
+ .close = ff_ac3_encode_close,
+ .sample_fmts = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_FLTP,
+ AV_SAMPLE_FMT_NONE },
+ .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
+ .priv_class = &ac3enc_class,
+ .channel_layouts = ff_ac3_channel_layouts,
+ .defaults = ac3_defaults,
};
+#endif