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/*
* Bink Audio decoder |
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* Copyright (c) 2007-2011 Peter Ross (pross@xvid.org) |
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* Copyright (c) 2009 Daniel Verkamp (daniel@drv.nu)
*
* This file is part of FFmpeg.
*
* FFmpeg 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,
* 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
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/** |
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* @file |
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* Bink Audio decoder
*
* Technical details here:
* http://wiki.multimedia.cx/index.php?title=Bink_Audio
*/
#include "avcodec.h" |
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#define BITSTREAM_READER_LE |
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#include "get_bits.h"
#include "dsputil.h" |
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#include "dct.h"
#include "rdft.h" |
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#include "fmtconvert.h" |
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#include "libavutil/intfloat.h" |
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|
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extern const uint16_t ff_wma_critical_freqs[25];
|
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static float quant_table[96]; |
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|
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#define MAX_CHANNELS 2
#define BINK_BLOCK_MAX_SIZE (MAX_CHANNELS << 11)
typedef struct { |
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AVFrame frame; |
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GetBitContext gb;
DSPContext dsp; |
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FmtConvertContext fmt_conv; |
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int version_b; ///< Bink version 'b' |
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int first;
int channels;
int frame_len; ///< transform size (samples)
int overlap_len; ///< overlap size (samples)
int block_size;
int num_bands;
unsigned int *bands;
float root; |
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DECLARE_ALIGNED(32, FFTSample, coeffs)[BINK_BLOCK_MAX_SIZE]; |
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DECLARE_ALIGNED(16, int16_t, previous)[BINK_BLOCK_MAX_SIZE / 16]; ///< coeffs from previous audio block |
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DECLARE_ALIGNED(16, int16_t, current)[BINK_BLOCK_MAX_SIZE / 16]; |
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float *coeffs_ptr[MAX_CHANNELS]; ///< pointers to the coeffs arrays for float_to_int16_interleave |
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float *prev_ptr[MAX_CHANNELS]; ///< pointers to the overlap points in the coeffs array |
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uint8_t *packet_buffer; |
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union {
RDFTContext rdft;
DCTContext dct;
} trans;
} BinkAudioContext;
static av_cold int decode_init(AVCodecContext *avctx)
{
BinkAudioContext *s = avctx->priv_data;
int sample_rate = avctx->sample_rate;
int sample_rate_half;
int i;
int frame_len_bits;
|
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ff_dsputil_init(&s->dsp, avctx); |
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ff_fmt_convert_init(&s->fmt_conv, avctx); |
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/* determine frame length */
if (avctx->sample_rate < 22050) {
frame_len_bits = 9;
} else if (avctx->sample_rate < 44100) {
frame_len_bits = 10;
} else {
frame_len_bits = 11;
}
|
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if (avctx->channels > MAX_CHANNELS) { |
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av_log(avctx, AV_LOG_ERROR, "too many channels: %d\n", avctx->channels); |
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return -1;
}
|
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s->version_b = avctx->extradata && avctx->extradata[3] == 'b'; |
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|
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if (avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT) {
// audio is already interleaved for the RDFT format variant
sample_rate *= avctx->channels;
s->channels = 1; |
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if (!s->version_b)
frame_len_bits += av_log2(avctx->channels); |
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} else {
s->channels = avctx->channels;
}
|
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s->frame_len = 1 << frame_len_bits; |
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s->overlap_len = s->frame_len / 16;
s->block_size = (s->frame_len - s->overlap_len) * s->channels;
sample_rate_half = (sample_rate + 1) / 2;
s->root = 2.0 / sqrt(s->frame_len); |
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for (i = 0; i < 96; i++) { |
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/* constant is result of 0.066399999/log10(M_E) */
quant_table[i] = expf(i * 0.15289164787221953823f) * s->root;
} |
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/* calculate number of bands */
for (s->num_bands = 1; s->num_bands < 25; s->num_bands++)
if (sample_rate_half <= ff_wma_critical_freqs[s->num_bands - 1])
break;
s->bands = av_malloc((s->num_bands + 1) * sizeof(*s->bands));
if (!s->bands)
return AVERROR(ENOMEM);
/* populate bands data */ |
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s->bands[0] = 2; |
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for (i = 1; i < s->num_bands; i++) |
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s->bands[i] = (ff_wma_critical_freqs[i - 1] * s->frame_len / sample_rate_half) & ~1;
s->bands[s->num_bands] = s->frame_len; |
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s->first = 1; |
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avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
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|
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for (i = 0; i < s->channels; i++) { |
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s->coeffs_ptr[i] = s->coeffs + i * s->frame_len; |
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s->prev_ptr[i] = s->coeffs_ptr[i] + s->frame_len - s->overlap_len;
} |
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|
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if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT) |
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ff_rdft_init(&s->trans.rdft, frame_len_bits, DFT_C2R); |
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else if (CONFIG_BINKAUDIO_DCT_DECODER) |
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ff_dct_init(&s->trans.dct, frame_len_bits, DCT_III); |
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else
return -1; |
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|
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avcodec_get_frame_defaults(&s->frame);
avctx->coded_frame = &s->frame;
|
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return 0;
}
static float get_float(GetBitContext *gb)
{
int power = get_bits(gb, 5);
float f = ldexpf(get_bits_long(gb, 23), power - 23);
if (get_bits1(gb))
f = -f;
return f;
}
static const uint8_t rle_length_tab[16] = {
2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 16, 32, 64
};
|
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#define GET_BITS_SAFE(out, nbits) do { \
if (get_bits_left(gb) < nbits) \
return AVERROR_INVALIDDATA; \
out = get_bits(gb, nbits); \
} while (0)
|
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/**
* Decode Bink Audio block
* @param[out] out Output buffer (must contain s->block_size elements) |
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* @return 0 on success, negative error code on failure |
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*/ |
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static int decode_block(BinkAudioContext *s, int16_t *out, int use_dct) |
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{
int ch, i, j, k;
float q, quant[25];
int width, coeff;
GetBitContext *gb = &s->gb;
if (use_dct)
skip_bits(gb, 2);
for (ch = 0; ch < s->channels; ch++) {
FFTSample *coeffs = s->coeffs_ptr[ch]; |
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if (s->version_b) { |
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if (get_bits_left(gb) < 64)
return AVERROR_INVALIDDATA; |
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coeffs[0] = av_int2float(get_bits_long(gb, 32)) * s->root;
coeffs[1] = av_int2float(get_bits_long(gb, 32)) * s->root; |
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} else { |
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if (get_bits_left(gb) < 58)
return AVERROR_INVALIDDATA; |
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coeffs[0] = get_float(gb) * s->root;
coeffs[1] = get_float(gb) * s->root;
} |
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|
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if (get_bits_left(gb) < s->num_bands * 8)
return AVERROR_INVALIDDATA; |
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for (i = 0; i < s->num_bands; i++) {
int value = get_bits(gb, 8); |
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quant[i] = quant_table[FFMIN(value, 95)]; |
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}
|
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k = 0;
q = quant[0]; |
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// parse coefficients
i = 2;
while (i < s->frame_len) { |
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if (s->version_b) {
j = i + 16; |
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} else { |
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int v;
GET_BITS_SAFE(v, 1);
if (v) {
GET_BITS_SAFE(v, 4);
j = i + rle_length_tab[v] * 8;
} else {
j = i + 8;
} |
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}
j = FFMIN(j, s->frame_len);
|
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GET_BITS_SAFE(width, 4); |
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if (width == 0) {
memset(coeffs + i, 0, (j - i) * sizeof(*coeffs));
i = j; |
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while (s->bands[k] < i) |
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q = quant[k++];
} else {
while (i < j) { |
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if (s->bands[k] == i) |
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q = quant[k++]; |
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GET_BITS_SAFE(coeff, width); |
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if (coeff) { |
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int v;
GET_BITS_SAFE(v, 1);
if (v) |
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coeffs[i] = -q * coeff;
else
coeffs[i] = q * coeff;
} else {
coeffs[i] = 0.0f;
}
i++;
}
}
}
|
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if (CONFIG_BINKAUDIO_DCT_DECODER && use_dct) {
coeffs[0] /= 0.5; |
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s->trans.dct.dct_calc(&s->trans.dct, coeffs); |
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s->dsp.vector_fmul_scalar(coeffs, coeffs, s->frame_len / 2, s->frame_len);
} |
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else if (CONFIG_BINKAUDIO_RDFT_DECODER) |
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s->trans.rdft.rdft_calc(&s->trans.rdft, coeffs); |
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}
|
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s->fmt_conv.float_to_int16_interleave(s->current,
(const float **)s->prev_ptr,
s->overlap_len, s->channels); |
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s->fmt_conv.float_to_int16_interleave(out, (const float **)s->coeffs_ptr, |
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s->frame_len - s->overlap_len,
s->channels); |
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if (!s->first) {
int count = s->overlap_len * s->channels;
int shift = av_log2(count);
for (i = 0; i < count; i++) {
out[i] = (s->previous[i] * (count - i) + out[i] * i) >> shift;
}
}
|
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memcpy(s->previous, s->current,
s->overlap_len * s->channels * sizeof(*s->previous)); |
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s->first = 0; |
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return 0; |
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}
static av_cold int decode_end(AVCodecContext *avctx)
{
BinkAudioContext * s = avctx->priv_data;
av_freep(&s->bands); |
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av_freep(&s->packet_buffer); |
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if (CONFIG_BINKAUDIO_RDFT_DECODER && avctx->codec->id == CODEC_ID_BINKAUDIO_RDFT) |
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ff_rdft_end(&s->trans.rdft); |
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else if (CONFIG_BINKAUDIO_DCT_DECODER) |
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ff_dct_end(&s->trans.dct); |
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|
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return 0;
}
static void get_bits_align32(GetBitContext *s)
{
int n = (-get_bits_count(s)) & 31;
if (n) skip_bits(s, n);
}
|
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static int decode_frame(AVCodecContext *avctx, void *data,
int *got_frame_ptr, AVPacket *avpkt) |
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{
BinkAudioContext *s = avctx->priv_data; |
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int16_t *samples; |
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GetBitContext *gb = &s->gb; |
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int ret, consumed = 0; |
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if (!get_bits_left(gb)) {
uint8_t *buf;
/* handle end-of-stream */
if (!avpkt->size) { |
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*got_frame_ptr = 0; |
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return 0;
}
if (avpkt->size < 4) {
av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
return AVERROR_INVALIDDATA;
}
buf = av_realloc(s->packet_buffer, avpkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!buf)
return AVERROR(ENOMEM);
s->packet_buffer = buf;
memcpy(s->packet_buffer, avpkt->data, avpkt->size);
init_get_bits(gb, s->packet_buffer, avpkt->size * 8);
consumed = avpkt->size;
/* skip reported size */
skip_bits_long(gb, 32); |
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} |
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|
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/* get output buffer */
s->frame.nb_samples = s->block_size / avctx->channels;
if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret; |
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} |
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samples = (int16_t *)s->frame.data[0]; |
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|
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if (decode_block(s, samples, avctx->codec->id == CODEC_ID_BINKAUDIO_DCT)) {
av_log(avctx, AV_LOG_ERROR, "Incomplete packet\n");
return AVERROR_INVALIDDATA; |
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} |
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get_bits_align32(gb); |
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|
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*got_frame_ptr = 1;
*(AVFrame *)data = s->frame;
|
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return consumed; |
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}
|
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AVCodec ff_binkaudio_rdft_decoder = { |
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.name = "binkaudio_rdft",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_BINKAUDIO_RDFT,
.priv_data_size = sizeof(BinkAudioContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame, |
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.capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Bink Audio (RDFT)") |
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};
|
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AVCodec ff_binkaudio_dct_decoder = { |
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.name = "binkaudio_dct",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_BINKAUDIO_DCT,
.priv_data_size = sizeof(BinkAudioContext),
.init = decode_init,
.close = decode_end,
.decode = decode_frame, |
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.capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Bink Audio (DCT)") |
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}; |