| /* |
| * G.722 ADPCM audio encoder/decoder |
| * |
| * Copyright (c) CMU 1993 Computer Science, Speech Group |
| * Chengxiang Lu and Alex Hauptmann |
| * Copyright (c) 2005 Steve Underwood <steveu at coppice.org> |
| * Copyright (c) 2009 Kenan Gillet |
| * Copyright (c) 2010 Martin Storsjo |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file |
| * |
| * G.722 ADPCM audio codec |
| * |
| * This G.722 decoder is a bit-exact implementation of the ITU G.722 |
| * specification for all three specified bitrates - 64000bps, 56000bps |
| * and 48000bps. It passes the ITU tests. |
| * |
| * @note For the 56000bps and 48000bps bitrates, the lowest 1 or 2 bits |
| * respectively of each byte are ignored. |
| */ |
| |
| #include "avcodec.h" |
| #include "mathops.h" |
| #include "get_bits.h" |
| |
| #define PREV_SAMPLES_BUF_SIZE 1024 |
| |
| #define FREEZE_INTERVAL 128 |
| |
| typedef struct { |
| int16_t prev_samples[PREV_SAMPLES_BUF_SIZE]; ///< memory of past decoded samples |
| int prev_samples_pos; ///< the number of values in prev_samples |
| |
| /** |
| * The band[0] and band[1] correspond respectively to the lower band and higher band. |
| */ |
| struct G722Band { |
| int16_t s_predictor; ///< predictor output value |
| int32_t s_zero; ///< previous output signal from zero predictor |
| int8_t part_reconst_mem[2]; ///< signs of previous partially reconstructed signals |
| int16_t prev_qtzd_reconst; ///< previous quantized reconstructed signal (internal value, using low_inv_quant4) |
| int16_t pole_mem[2]; ///< second-order pole section coefficient buffer |
| int32_t diff_mem[6]; ///< quantizer difference signal memory |
| int16_t zero_mem[6]; ///< Seventh-order zero section coefficient buffer |
| int16_t log_factor; ///< delayed 2-logarithmic quantizer factor |
| int16_t scale_factor; ///< delayed quantizer scale factor |
| } band[2]; |
| |
| struct TrellisNode { |
| struct G722Band state; |
| uint32_t ssd; |
| int path; |
| } *node_buf[2], **nodep_buf[2]; |
| |
| struct TrellisPath { |
| int value; |
| int prev; |
| } *paths[2]; |
| } G722Context; |
| |
| |
| static const int8_t sign_lookup[2] = { -1, 1 }; |
| |
| static const int16_t inv_log2_table[32] = { |
| 2048, 2093, 2139, 2186, 2233, 2282, 2332, 2383, |
| 2435, 2489, 2543, 2599, 2656, 2714, 2774, 2834, |
| 2896, 2960, 3025, 3091, 3158, 3228, 3298, 3371, |
| 3444, 3520, 3597, 3676, 3756, 3838, 3922, 4008 |
| }; |
| static const int16_t high_log_factor_step[2] = { 798, -214 }; |
| static const int16_t high_inv_quant[4] = { -926, -202, 926, 202 }; |
| /** |
| * low_log_factor_step[index] == wl[rl42[index]] |
| */ |
| static const int16_t low_log_factor_step[16] = { |
| -60, 3042, 1198, 538, 334, 172, 58, -30, |
| 3042, 1198, 538, 334, 172, 58, -30, -60 |
| }; |
| static const int16_t low_inv_quant4[16] = { |
| 0, -2557, -1612, -1121, -786, -530, -323, -150, |
| 2557, 1612, 1121, 786, 530, 323, 150, 0 |
| }; |
| static const int16_t low_inv_quant6[64] = { |
| -17, -17, -17, -17, -3101, -2738, -2376, -2088, |
| -1873, -1689, -1535, -1399, -1279, -1170, -1072, -982, |
| -899, -822, -750, -682, -618, -558, -501, -447, |
| -396, -347, -300, -254, -211, -170, -130, -91, |
| 3101, 2738, 2376, 2088, 1873, 1689, 1535, 1399, |
| 1279, 1170, 1072, 982, 899, 822, 750, 682, |
| 618, 558, 501, 447, 396, 347, 300, 254, |
| 211, 170, 130, 91, 54, 17, -54, -17 |
| }; |
| |
| /** |
| * quadrature mirror filter (QMF) coefficients |
| * |
| * ITU-T G.722 Table 11 |
| */ |
| static const int16_t qmf_coeffs[12] = { |
| 3, -11, 12, 32, -210, 951, 3876, -805, 362, -156, 53, -11, |
| }; |
| |
| |
| /** |
| * adaptive predictor |
| * |
| * @param cur_diff the dequantized and scaled delta calculated from the |
| * current codeword |
| */ |
| static void do_adaptive_prediction(struct G722Band *band, const int cur_diff) |
| { |
| int sg[2], limit, i, cur_qtzd_reconst; |
| |
| const int cur_part_reconst = band->s_zero + cur_diff < 0; |
| |
| sg[0] = sign_lookup[cur_part_reconst != band->part_reconst_mem[0]]; |
| sg[1] = sign_lookup[cur_part_reconst == band->part_reconst_mem[1]]; |
| band->part_reconst_mem[1] = band->part_reconst_mem[0]; |
| band->part_reconst_mem[0] = cur_part_reconst; |
| |
| band->pole_mem[1] = av_clip((sg[0] * av_clip(band->pole_mem[0], -8191, 8191) >> 5) + |
| (sg[1] << 7) + (band->pole_mem[1] * 127 >> 7), -12288, 12288); |
| |
| limit = 15360 - band->pole_mem[1]; |
| band->pole_mem[0] = av_clip(-192 * sg[0] + (band->pole_mem[0] * 255 >> 8), -limit, limit); |
| |
| |
| if (cur_diff) { |
| for (i = 0; i < 6; i++) |
| band->zero_mem[i] = ((band->zero_mem[i]*255) >> 8) + |
| ((band->diff_mem[i]^cur_diff) < 0 ? -128 : 128); |
| } else |
| for (i = 0; i < 6; i++) |
| band->zero_mem[i] = (band->zero_mem[i]*255) >> 8; |
| |
| for (i = 5; i > 0; i--) |
| band->diff_mem[i] = band->diff_mem[i-1]; |
| band->diff_mem[0] = av_clip_int16(cur_diff << 1); |
| |
| band->s_zero = 0; |
| for (i = 5; i >= 0; i--) |
| band->s_zero += (band->zero_mem[i]*band->diff_mem[i]) >> 15; |
| |
| |
| cur_qtzd_reconst = av_clip_int16((band->s_predictor + cur_diff) << 1); |
| band->s_predictor = av_clip_int16(band->s_zero + |
| (band->pole_mem[0] * cur_qtzd_reconst >> 15) + |
| (band->pole_mem[1] * band->prev_qtzd_reconst >> 15)); |
| band->prev_qtzd_reconst = cur_qtzd_reconst; |
| } |
| |
| static int inline linear_scale_factor(const int log_factor) |
| { |
| const int wd1 = inv_log2_table[(log_factor >> 6) & 31]; |
| const int shift = log_factor >> 11; |
| return shift < 0 ? wd1 >> -shift : wd1 << shift; |
| } |
| |
| static void update_low_predictor(struct G722Band *band, const int ilow) |
| { |
| do_adaptive_prediction(band, |
| band->scale_factor * low_inv_quant4[ilow] >> 10); |
| |
| // quantizer adaptation |
| band->log_factor = av_clip((band->log_factor * 127 >> 7) + |
| low_log_factor_step[ilow], 0, 18432); |
| band->scale_factor = linear_scale_factor(band->log_factor - (8 << 11)); |
| } |
| |
| static void update_high_predictor(struct G722Band *band, const int dhigh, |
| const int ihigh) |
| { |
| do_adaptive_prediction(band, dhigh); |
| |
| // quantizer adaptation |
| band->log_factor = av_clip((band->log_factor * 127 >> 7) + |
| high_log_factor_step[ihigh&1], 0, 22528); |
| band->scale_factor = linear_scale_factor(band->log_factor - (10 << 11)); |
| } |
| |
| static void apply_qmf(const int16_t *prev_samples, int *xout1, int *xout2) |
| { |
| int i; |
| |
| *xout1 = 0; |
| *xout2 = 0; |
| for (i = 0; i < 12; i++) { |
| MAC16(*xout2, prev_samples[2*i ], qmf_coeffs[i ]); |
| MAC16(*xout1, prev_samples[2*i+1], qmf_coeffs[11-i]); |
| } |
| } |
| |
| static av_cold int g722_init(AVCodecContext * avctx) |
| { |
| G722Context *c = avctx->priv_data; |
| |
| if (avctx->channels != 1) { |
| av_log(avctx, AV_LOG_ERROR, "Only mono tracks are allowed.\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| avctx->sample_fmt = AV_SAMPLE_FMT_S16; |
| |
| switch (avctx->bits_per_coded_sample) { |
| case 8: |
| case 7: |
| case 6: |
| break; |
| default: |
| av_log(avctx, AV_LOG_WARNING, "Unsupported bits_per_coded_sample [%d], " |
| "assuming 8\n", |
| avctx->bits_per_coded_sample); |
| case 0: |
| avctx->bits_per_coded_sample = 8; |
| break; |
| } |
| |
| c->band[0].scale_factor = 8; |
| c->band[1].scale_factor = 2; |
| c->prev_samples_pos = 22; |
| |
| if (avctx->lowres) |
| avctx->sample_rate /= 2; |
| |
| if (avctx->trellis) { |
| int frontier = 1 << avctx->trellis; |
| int max_paths = frontier * FREEZE_INTERVAL; |
| int i; |
| for (i = 0; i < 2; i++) { |
| c->paths[i] = av_mallocz(max_paths * sizeof(**c->paths)); |
| c->node_buf[i] = av_mallocz(2 * frontier * sizeof(**c->node_buf)); |
| c->nodep_buf[i] = av_mallocz(2 * frontier * sizeof(**c->nodep_buf)); |
| } |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int g722_close(AVCodecContext *avctx) |
| { |
| G722Context *c = avctx->priv_data; |
| int i; |
| for (i = 0; i < 2; i++) { |
| av_freep(&c->paths[i]); |
| av_freep(&c->node_buf[i]); |
| av_freep(&c->nodep_buf[i]); |
| } |
| return 0; |
| } |
| |
| #if CONFIG_ADPCM_G722_DECODER |
| static const int16_t low_inv_quant5[32] = { |
| -35, -35, -2919, -2195, -1765, -1458, -1219, -1023, |
| -858, -714, -587, -473, -370, -276, -190, -110, |
| 2919, 2195, 1765, 1458, 1219, 1023, 858, 714, |
| 587, 473, 370, 276, 190, 110, 35, -35 |
| }; |
| |
| static const int16_t *low_inv_quants[3] = { low_inv_quant6, low_inv_quant5, |
| low_inv_quant4 }; |
| |
| static int g722_decode_frame(AVCodecContext *avctx, void *data, |
| int *data_size, AVPacket *avpkt) |
| { |
| G722Context *c = avctx->priv_data; |
| int16_t *out_buf = data; |
| int j, out_len = 0; |
| const int skip = 8 - avctx->bits_per_coded_sample; |
| const int16_t *quantizer_table = low_inv_quants[skip]; |
| GetBitContext gb; |
| |
| init_get_bits(&gb, avpkt->data, avpkt->size * 8); |
| |
| for (j = 0; j < avpkt->size; j++) { |
| int ilow, ihigh, rlow; |
| |
| ihigh = get_bits(&gb, 2); |
| ilow = get_bits(&gb, 6 - skip); |
| skip_bits(&gb, skip); |
| |
| rlow = av_clip((c->band[0].scale_factor * quantizer_table[ilow] >> 10) |
| + c->band[0].s_predictor, -16384, 16383); |
| |
| update_low_predictor(&c->band[0], ilow >> (2 - skip)); |
| |
| if (!avctx->lowres) { |
| const int dhigh = c->band[1].scale_factor * |
| high_inv_quant[ihigh] >> 10; |
| const int rhigh = av_clip(dhigh + c->band[1].s_predictor, |
| -16384, 16383); |
| int xout1, xout2; |
| |
| update_high_predictor(&c->band[1], dhigh, ihigh); |
| |
| c->prev_samples[c->prev_samples_pos++] = rlow + rhigh; |
| c->prev_samples[c->prev_samples_pos++] = rlow - rhigh; |
| apply_qmf(c->prev_samples + c->prev_samples_pos - 24, |
| &xout1, &xout2); |
| out_buf[out_len++] = av_clip_int16(xout1 >> 12); |
| out_buf[out_len++] = av_clip_int16(xout2 >> 12); |
| if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { |
| memmove(c->prev_samples, |
| c->prev_samples + c->prev_samples_pos - 22, |
| 22 * sizeof(c->prev_samples[0])); |
| c->prev_samples_pos = 22; |
| } |
| } else |
| out_buf[out_len++] = rlow; |
| } |
| *data_size = out_len << 1; |
| return avpkt->size; |
| } |
| |
| AVCodec ff_adpcm_g722_decoder = { |
| .name = "g722", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .id = CODEC_ID_ADPCM_G722, |
| .priv_data_size = sizeof(G722Context), |
| .init = g722_init, |
| .decode = g722_decode_frame, |
| .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), |
| .max_lowres = 1, |
| }; |
| #endif |
| |
| #if CONFIG_ADPCM_G722_ENCODER |
| static const int16_t low_quant[33] = { |
| 35, 72, 110, 150, 190, 233, 276, 323, |
| 370, 422, 473, 530, 587, 650, 714, 786, |
| 858, 940, 1023, 1121, 1219, 1339, 1458, 1612, |
| 1765, 1980, 2195, 2557, 2919 |
| }; |
| |
| static inline void filter_samples(G722Context *c, const int16_t *samples, |
| int *xlow, int *xhigh) |
| { |
| int xout1, xout2; |
| c->prev_samples[c->prev_samples_pos++] = samples[0]; |
| c->prev_samples[c->prev_samples_pos++] = samples[1]; |
| apply_qmf(c->prev_samples + c->prev_samples_pos - 24, &xout1, &xout2); |
| *xlow = xout1 + xout2 >> 13; |
| *xhigh = xout1 - xout2 >> 13; |
| if (c->prev_samples_pos >= PREV_SAMPLES_BUF_SIZE) { |
| memmove(c->prev_samples, |
| c->prev_samples + c->prev_samples_pos - 22, |
| 22 * sizeof(c->prev_samples[0])); |
| c->prev_samples_pos = 22; |
| } |
| } |
| |
| static inline int encode_high(const struct G722Band *state, int xhigh) |
| { |
| int diff = av_clip_int16(xhigh - state->s_predictor); |
| int pred = 141 * state->scale_factor >> 8; |
| /* = diff >= 0 ? (diff < pred) + 2 : diff >= -pred */ |
| return ((diff ^ (diff >> (sizeof(diff)*8-1))) < pred) + 2*(diff >= 0); |
| } |
| |
| static inline int encode_low(const struct G722Band* state, int xlow) |
| { |
| int diff = av_clip_int16(xlow - state->s_predictor); |
| /* = diff >= 0 ? diff : -(diff + 1) */ |
| int limit = diff ^ (diff >> (sizeof(diff)*8-1)); |
| int i = 0; |
| limit = limit + 1 << 10; |
| if (limit > low_quant[8] * state->scale_factor) |
| i = 9; |
| while (i < 29 && limit > low_quant[i] * state->scale_factor) |
| i++; |
| return (diff < 0 ? (i < 2 ? 63 : 33) : 61) - i; |
| } |
| |
| static int g722_encode_trellis(AVCodecContext *avctx, |
| uint8_t *dst, int buf_size, void *data) |
| { |
| G722Context *c = avctx->priv_data; |
| const int16_t *samples = data; |
| int i, j, k; |
| int frontier = 1 << avctx->trellis; |
| struct TrellisNode **nodes[2]; |
| struct TrellisNode **nodes_next[2]; |
| int pathn[2] = {0, 0}, froze = -1; |
| struct TrellisPath *p[2]; |
| |
| for (i = 0; i < 2; i++) { |
| nodes[i] = c->nodep_buf[i]; |
| nodes_next[i] = c->nodep_buf[i] + frontier; |
| memset(c->nodep_buf[i], 0, 2 * frontier * sizeof(*c->nodep_buf)); |
| nodes[i][0] = c->node_buf[i] + frontier; |
| nodes[i][0]->ssd = 0; |
| nodes[i][0]->path = 0; |
| nodes[i][0]->state = c->band[i]; |
| } |
| |
| for (i = 0; i < buf_size >> 1; i++) { |
| int xlow, xhigh; |
| struct TrellisNode *next[2]; |
| int heap_pos[2] = {0, 0}; |
| |
| for (j = 0; j < 2; j++) { |
| next[j] = c->node_buf[j] + frontier*(i & 1); |
| memset(nodes_next[j], 0, frontier * sizeof(**nodes_next)); |
| } |
| |
| filter_samples(c, &samples[2*i], &xlow, &xhigh); |
| |
| for (j = 0; j < frontier && nodes[0][j]; j++) { |
| /* Only k >> 2 affects the future adaptive state, therefore testing |
| * small steps that don't change k >> 2 is useless, the orignal |
| * value from encode_low is better than them. Since we step k |
| * in steps of 4, make sure range is a multiple of 4, so that |
| * we don't miss the original value from encode_low. */ |
| int range = j < frontier/2 ? 4 : 0; |
| struct TrellisNode *cur_node = nodes[0][j]; |
| |
| int ilow = encode_low(&cur_node->state, xlow); |
| |
| for (k = ilow - range; k <= ilow + range && k <= 63; k += 4) { |
| int decoded, dec_diff, pos; |
| uint32_t ssd; |
| struct TrellisNode* node; |
| |
| if (k < 0) |
| continue; |
| |
| decoded = av_clip((cur_node->state.scale_factor * |
| low_inv_quant6[k] >> 10) |
| + cur_node->state.s_predictor, -16384, 16383); |
| dec_diff = xlow - decoded; |
| |
| #define STORE_NODE(index, UPDATE, VALUE)\ |
| ssd = cur_node->ssd + dec_diff*dec_diff;\ |
| /* Check for wraparound. Using 64 bit ssd counters would \ |
| * be simpler, but is slower on x86 32 bit. */\ |
| if (ssd < cur_node->ssd)\ |
| continue;\ |
| if (heap_pos[index] < frontier) {\ |
| pos = heap_pos[index]++;\ |
| assert(pathn[index] < FREEZE_INTERVAL * frontier);\ |
| node = nodes_next[index][pos] = next[index]++;\ |
| node->path = pathn[index]++;\ |
| } else {\ |
| /* Try to replace one of the leaf nodes with the new \ |
| * one, but not always testing the same leaf position */\ |
| pos = (frontier>>1) + (heap_pos[index] & ((frontier>>1) - 1));\ |
| if (ssd >= nodes_next[index][pos]->ssd)\ |
| continue;\ |
| heap_pos[index]++;\ |
| node = nodes_next[index][pos];\ |
| }\ |
| node->ssd = ssd;\ |
| node->state = cur_node->state;\ |
| UPDATE;\ |
| c->paths[index][node->path].value = VALUE;\ |
| c->paths[index][node->path].prev = cur_node->path;\ |
| /* Sift the newly inserted node up in the heap to restore \ |
| * the heap property */\ |
| while (pos > 0) {\ |
| int parent = (pos - 1) >> 1;\ |
| if (nodes_next[index][parent]->ssd <= ssd)\ |
| break;\ |
| FFSWAP(struct TrellisNode*, nodes_next[index][parent],\ |
| nodes_next[index][pos]);\ |
| pos = parent;\ |
| } |
| STORE_NODE(0, update_low_predictor(&node->state, k >> 2), k); |
| } |
| } |
| |
| for (j = 0; j < frontier && nodes[1][j]; j++) { |
| int ihigh; |
| struct TrellisNode *cur_node = nodes[1][j]; |
| |
| /* We don't try to get any initial guess for ihigh via |
| * encode_high - since there's only 4 possible values, test |
| * them all. Testing all of these gives a much, much larger |
| * gain than testing a larger range around ilow. */ |
| for (ihigh = 0; ihigh < 4; ihigh++) { |
| int dhigh, decoded, dec_diff, pos; |
| uint32_t ssd; |
| struct TrellisNode* node; |
| |
| dhigh = cur_node->state.scale_factor * |
| high_inv_quant[ihigh] >> 10; |
| decoded = av_clip(dhigh + cur_node->state.s_predictor, |
| -16384, 16383); |
| dec_diff = xhigh - decoded; |
| |
| STORE_NODE(1, update_high_predictor(&node->state, dhigh, ihigh), ihigh); |
| } |
| } |
| |
| for (j = 0; j < 2; j++) { |
| FFSWAP(struct TrellisNode**, nodes[j], nodes_next[j]); |
| |
| if (nodes[j][0]->ssd > (1 << 16)) { |
| for (k = 1; k < frontier && nodes[j][k]; k++) |
| nodes[j][k]->ssd -= nodes[j][0]->ssd; |
| nodes[j][0]->ssd = 0; |
| } |
| } |
| |
| if (i == froze + FREEZE_INTERVAL) { |
| p[0] = &c->paths[0][nodes[0][0]->path]; |
| p[1] = &c->paths[1][nodes[1][0]->path]; |
| for (j = i; j > froze; j--) { |
| dst[j] = p[1]->value << 6 | p[0]->value; |
| p[0] = &c->paths[0][p[0]->prev]; |
| p[1] = &c->paths[1][p[1]->prev]; |
| } |
| froze = i; |
| pathn[0] = pathn[1] = 0; |
| memset(nodes[0] + 1, 0, (frontier - 1)*sizeof(**nodes)); |
| memset(nodes[1] + 1, 0, (frontier - 1)*sizeof(**nodes)); |
| } |
| } |
| |
| p[0] = &c->paths[0][nodes[0][0]->path]; |
| p[1] = &c->paths[1][nodes[1][0]->path]; |
| for (j = i; j > froze; j--) { |
| dst[j] = p[1]->value << 6 | p[0]->value; |
| p[0] = &c->paths[0][p[0]->prev]; |
| p[1] = &c->paths[1][p[1]->prev]; |
| } |
| c->band[0] = nodes[0][0]->state; |
| c->band[1] = nodes[1][0]->state; |
| |
| return i; |
| } |
| |
| static int g722_encode_frame(AVCodecContext *avctx, |
| uint8_t *dst, int buf_size, void *data) |
| { |
| G722Context *c = avctx->priv_data; |
| const int16_t *samples = data; |
| int i; |
| |
| if (avctx->trellis) |
| return g722_encode_trellis(avctx, dst, buf_size, data); |
| |
| for (i = 0; i < buf_size >> 1; i++) { |
| int xlow, xhigh, ihigh, ilow; |
| filter_samples(c, &samples[2*i], &xlow, &xhigh); |
| ihigh = encode_high(&c->band[1], xhigh); |
| ilow = encode_low(&c->band[0], xlow); |
| update_high_predictor(&c->band[1], c->band[1].scale_factor * |
| high_inv_quant[ihigh] >> 10, ihigh); |
| update_low_predictor(&c->band[0], ilow >> 2); |
| *dst++ = ihigh << 6 | ilow; |
| } |
| return i; |
| } |
| |
| AVCodec ff_adpcm_g722_encoder = { |
| .name = "g722", |
| .type = AVMEDIA_TYPE_AUDIO, |
| .id = CODEC_ID_ADPCM_G722, |
| .priv_data_size = sizeof(G722Context), |
| .init = g722_init, |
| .close = g722_close, |
| .encode = g722_encode_frame, |
| .long_name = NULL_IF_CONFIG_SMALL("G.722 ADPCM"), |
| .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE}, |
| }; |
| #endif |
| |