* Copyright (c) 2006-2010 Justin Ruggles <justin.ruggles@gmail.com>
* Copyright (c) 2006-2010 Prakash Punnoor <prakash@punnoor.de>
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
*/
#define CONFIG_AC3ENC_FLOAT 1
-#include "ac3enc.c"
+#include "internal.h"
+#include "audiodsp.h"
+#include "ac3enc.h"
+#include "eac3enc.h"
+#include "kbdwin.h"
+
+
+#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 };
+
+#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
+/*
+ * Normalize the input samples.
+ * Not needed for the floating-point encoder.
*/
-static void mdct512(AC3MDCTContext *mdct, float *out, float *in)
+static int normalize_samples(AC3EncodeContext *s)
{
- ff_mdct_calc(&mdct->fft, out, in);
+ return 0;
}
-/**
- * Apply KBD window to input samples prior to MDCT.
+/*
+ * Scale MDCT coefficients from float to 24-bit fixed-point.
*/
-static void apply_window(DSPContext *dsp, float *output, const float *input,
- const float *window, int n)
+static void scale_coefficients(AC3EncodeContext *s)
{
- dsp->vector_fmul(output, input, window, n);
+ 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));
}
-/**
- * Normalize the input samples to use the maximum available precision.
+/*
+ * Clip MDCT coefficients to allowable range.
*/
-static int normalize_samples(AC3EncodeContext *s)
+static void clip_coefficients(AudioDSPContext *adsp, float *coef,
+ unsigned int len)
{
- /* Normalization is not needed for floating-point samples, so just return 0 */
- return 0;
+ adsp->vector_clipf(coef, coef, len, COEF_MIN, COEF_MAX);
}
-/**
- * Scale MDCT coefficients from float to 24-bit fixed-point.
+/*
+ * Calculate a single coupling coordinate.
*/
-static void scale_coefficients(AC3EncodeContext *s)
+static CoefType calc_cpl_coord(CoefSumType energy_ch, CoefSumType energy_cpl)
{
- int i;
- for (i = 0; i < AC3_MAX_COEFS * AC3_MAX_BLOCKS * s->channels; i++)
- s->fixed_coef_buffer[i] = SCALE_FLOAT(s->mdct_coef_buffer[i], 24);
+ float coord = 0.125;
+ if (energy_cpl > 0)
+ coord *= sqrtf(energy_ch / energy_cpl);
+ return FFMIN(coord, COEF_MAX);
}
+av_cold int ff_ac3_float_encode_init(AVCodecContext *avctx)
+{
+ AC3EncodeContext *s = avctx->priv_data;
+ avpriv_float_dsp_init(&s->fdsp, avctx->flags & AV_CODEC_FLAG_BITEXACT);
+ return ff_ac3_encode_init(avctx);
+}
-AVCodec 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,
+AVCodec ff_ac3_encoder = {
+ .name = "ac3",
+ .long_name = NULL_IF_CONFIG_SMALL("ATSC A/52A (AC-3)"),
+ .type = AVMEDIA_TYPE_AUDIO,
+ .id = AV_CODEC_ID_AC3,
+ .priv_data_size = sizeof(AC3EncodeContext),
+ .init = ff_ac3_float_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 },
+ .priv_class = &ac3enc_class,
+ .channel_layouts = ff_ac3_channel_layouts,
+ .defaults = ac3_defaults,
};
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