yading@10: /*
yading@10:  * RealAudio Lossless decoder
yading@10:  *
yading@10:  * Copyright (c) 2012 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of Libav.
yading@10:  *
yading@10:  * Libav is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * Libav is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with Libav; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * This is a decoder for Real Audio Lossless format.
yading@10:  * Dedicated to the mastermind behind it, Ralph Wiggum.
yading@10:  */
yading@10: 
yading@10: #include "libavutil/channel_layout.h"
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "golomb.h"
yading@10: #include "internal.h"
yading@10: #include "unary.h"
yading@10: #include "ralfdata.h"
yading@10: 
yading@10: #define FILTER_NONE 0
yading@10: #define FILTER_RAW  642
yading@10: 
yading@10: typedef struct VLCSet {
yading@10:     VLC filter_params;
yading@10:     VLC bias;
yading@10:     VLC coding_mode;
yading@10:     VLC filter_coeffs[10][11];
yading@10:     VLC short_codes[15];
yading@10:     VLC long_codes[125];
yading@10: } VLCSet;
yading@10: 
yading@10: #define RALF_MAX_PKT_SIZE 8192
yading@10: 
yading@10: typedef struct RALFContext {
yading@10:     int version;
yading@10:     int max_frame_size;
yading@10:     VLCSet sets[3];
yading@10:     int32_t channel_data[2][4096];
yading@10: 
yading@10:     int     filter_params;   ///< combined filter parameters for the current channel data
yading@10:     int     filter_length;   ///< length of the filter for the current channel data
yading@10:     int     filter_bits;     ///< filter precision for the current channel data
yading@10:     int32_t filter[64];
yading@10: 
yading@10:     int     bias[2];         ///< a constant value added to channel data after filtering
yading@10: 
yading@10:     int num_blocks;          ///< number of blocks inside the frame
yading@10:     int sample_offset;
yading@10:     int block_size[1 << 12]; ///< size of the blocks
yading@10:     int block_pts[1 << 12];  ///< block start time (in milliseconds)
yading@10: 
yading@10:     uint8_t pkt[16384];
yading@10:     int     has_pkt;
yading@10: } RALFContext;
yading@10: 
yading@10: #define MAX_ELEMS 644 // no RALF table uses more than that
yading@10: 
yading@10: static int init_ralf_vlc(VLC *vlc, const uint8_t *data, int elems)
yading@10: {
yading@10:     uint8_t  lens[MAX_ELEMS];
yading@10:     uint16_t codes[MAX_ELEMS];
yading@10:     int counts[17], prefixes[18];
yading@10:     int i, cur_len;
yading@10:     int max_bits = 0;
yading@10:     int nb = 0;
yading@10: 
yading@10:     for (i = 0; i <= 16; i++)
yading@10:         counts[i] = 0;
yading@10:     for (i = 0; i < elems; i++) {
yading@10:         cur_len  = (nb ? *data & 0xF : *data >> 4) + 1;
yading@10:         counts[cur_len]++;
yading@10:         max_bits = FFMAX(max_bits, cur_len);
yading@10:         lens[i]  = cur_len;
yading@10:         data    += nb;
yading@10:         nb      ^= 1;
yading@10:     }
yading@10:     prefixes[1] = 0;
yading@10:     for (i = 1; i <= 16; i++)
yading@10:         prefixes[i + 1] = (prefixes[i] + counts[i]) << 1;
yading@10: 
yading@10:     for (i = 0; i < elems; i++)
yading@10:         codes[i] = prefixes[lens[i]]++;
yading@10: 
yading@10:     return ff_init_vlc_sparse(vlc, FFMIN(max_bits, 9), elems,
yading@10:                               lens, 1, 1, codes, 2, 2, NULL, 0, 0, 0);
yading@10: }
yading@10: 
yading@10: static av_cold int decode_close(AVCodecContext *avctx)
yading@10: {
yading@10:     RALFContext *ctx = avctx->priv_data;
yading@10:     int i, j, k;
yading@10: 
yading@10:     for (i = 0; i < 3; i++) {
yading@10:         ff_free_vlc(&ctx->sets[i].filter_params);
yading@10:         ff_free_vlc(&ctx->sets[i].bias);
yading@10:         ff_free_vlc(&ctx->sets[i].coding_mode);
yading@10:         for (j = 0; j < 10; j++)
yading@10:             for (k = 0; k < 11; k++)
yading@10:                 ff_free_vlc(&ctx->sets[i].filter_coeffs[j][k]);
yading@10:         for (j = 0; j < 15; j++)
yading@10:             ff_free_vlc(&ctx->sets[i].short_codes[j]);
yading@10:         for (j = 0; j < 125; j++)
yading@10:             ff_free_vlc(&ctx->sets[i].long_codes[j]);
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     RALFContext *ctx = avctx->priv_data;
yading@10:     int i, j, k;
yading@10:     int ret;
yading@10: 
yading@10:     if (avctx->extradata_size < 24 || memcmp(avctx->extradata, "LSD:", 4)) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Extradata is not groovy, dude\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     ctx->version = AV_RB16(avctx->extradata + 4);
yading@10:     if (ctx->version != 0x103) {
yading@10:         avpriv_request_sample(avctx, "Unknown version %X", ctx->version);
yading@10:         return AVERROR_PATCHWELCOME;
yading@10:     }
yading@10: 
yading@10:     avctx->channels    = AV_RB16(avctx->extradata + 8);
yading@10:     avctx->sample_rate = AV_RB32(avctx->extradata + 12);
yading@10:     if (avctx->channels < 1 || avctx->channels > 2
yading@10:         || avctx->sample_rate < 8000 || avctx->sample_rate > 96000) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Invalid coding parameters %d Hz %d ch\n",
yading@10:                avctx->sample_rate, avctx->channels);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     avctx->sample_fmt     = AV_SAMPLE_FMT_S16P;
yading@10:     avctx->channel_layout = (avctx->channels == 2) ? AV_CH_LAYOUT_STEREO
yading@10:                                                    : AV_CH_LAYOUT_MONO;
yading@10: 
yading@10:     ctx->max_frame_size = AV_RB32(avctx->extradata + 16);
yading@10:     if (ctx->max_frame_size > (1 << 20) || !ctx->max_frame_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid frame size %d\n",
yading@10:                ctx->max_frame_size);
yading@10:     }
yading@10:     ctx->max_frame_size = FFMAX(ctx->max_frame_size, avctx->sample_rate);
yading@10: 
yading@10:     for (i = 0; i < 3; i++) {
yading@10:         ret = init_ralf_vlc(&ctx->sets[i].filter_params, filter_param_def[i],
yading@10:                             FILTERPARAM_ELEMENTS);
yading@10:         if (ret < 0) {
yading@10:             decode_close(avctx);
yading@10:             return ret;
yading@10:         }
yading@10:         ret = init_ralf_vlc(&ctx->sets[i].bias, bias_def[i], BIAS_ELEMENTS);
yading@10:         if (ret < 0) {
yading@10:             decode_close(avctx);
yading@10:             return ret;
yading@10:         }
yading@10:         ret = init_ralf_vlc(&ctx->sets[i].coding_mode, coding_mode_def[i],
yading@10:                             CODING_MODE_ELEMENTS);
yading@10:         if (ret < 0) {
yading@10:             decode_close(avctx);
yading@10:             return ret;
yading@10:         }
yading@10:         for (j = 0; j < 10; j++) {
yading@10:             for (k = 0; k < 11; k++) {
yading@10:                 ret = init_ralf_vlc(&ctx->sets[i].filter_coeffs[j][k],
yading@10:                                     filter_coeffs_def[i][j][k],
yading@10:                                     FILTER_COEFFS_ELEMENTS);
yading@10:                 if (ret < 0) {
yading@10:                     decode_close(avctx);
yading@10:                     return ret;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:         for (j = 0; j < 15; j++) {
yading@10:             ret = init_ralf_vlc(&ctx->sets[i].short_codes[j],
yading@10:                                 short_codes_def[i][j], SHORT_CODES_ELEMENTS);
yading@10:             if (ret < 0) {
yading@10:                 decode_close(avctx);
yading@10:                 return ret;
yading@10:             }
yading@10:         }
yading@10:         for (j = 0; j < 125; j++) {
yading@10:             ret = init_ralf_vlc(&ctx->sets[i].long_codes[j],
yading@10:                                 long_codes_def[i][j], LONG_CODES_ELEMENTS);
yading@10:             if (ret < 0) {
yading@10:                 decode_close(avctx);
yading@10:                 return ret;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline int extend_code(GetBitContext *gb, int val, int range, int bits)
yading@10: {
yading@10:     if (val == 0) {
yading@10:         val = -range - get_ue_golomb(gb);
yading@10:     } else if (val == range * 2) {
yading@10:         val =  range + get_ue_golomb(gb);
yading@10:     } else {
yading@10:         val -= range;
yading@10:     }
yading@10:     if (bits)
yading@10:         val = (val << bits) | get_bits(gb, bits);
yading@10:     return val;
yading@10: }
yading@10: 
yading@10: static int decode_channel(RALFContext *ctx, GetBitContext *gb, int ch,
yading@10:                           int length, int mode, int bits)
yading@10: {
yading@10:     int i, t;
yading@10:     int code_params;
yading@10:     VLCSet *set = ctx->sets + mode;
yading@10:     VLC *code_vlc; int range, range2, add_bits;
yading@10:     int *dst = ctx->channel_data[ch];
yading@10: 
yading@10:     ctx->filter_params = get_vlc2(gb, set->filter_params.table, 9, 2);
yading@10:     ctx->filter_bits   = (ctx->filter_params - 2) >> 6;
yading@10:     ctx->filter_length = ctx->filter_params - (ctx->filter_bits << 6) - 1;
yading@10: 
yading@10:     if (ctx->filter_params == FILTER_RAW) {
yading@10:         for (i = 0; i < length; i++)
yading@10:             dst[i] = get_bits(gb, bits);
yading@10:         ctx->bias[ch] = 0;
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     ctx->bias[ch] = get_vlc2(gb, set->bias.table, 9, 2);
yading@10:     ctx->bias[ch] = extend_code(gb, ctx->bias[ch], 127, 4);
yading@10: 
yading@10:     if (ctx->filter_params == FILTER_NONE) {
yading@10:         memset(dst, 0, sizeof(*dst) * length);
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     if (ctx->filter_params > 1) {
yading@10:         int cmode = 0, coeff = 0;
yading@10:         VLC *vlc = set->filter_coeffs[ctx->filter_bits] + 5;
yading@10: 
yading@10:         add_bits = ctx->filter_bits;
yading@10: 
yading@10:         for (i = 0; i < ctx->filter_length; i++) {
yading@10:             t = get_vlc2(gb, vlc[cmode].table, vlc[cmode].bits, 2);
yading@10:             t = extend_code(gb, t, 21, add_bits);
yading@10:             if (!cmode)
yading@10:                 coeff -= 12 << add_bits;
yading@10:             coeff = t - coeff;
yading@10:             ctx->filter[i] = coeff;
yading@10: 
yading@10:             cmode = coeff >> add_bits;
yading@10:             if (cmode < 0) {
yading@10:                 cmode = -1 - av_log2(-cmode);
yading@10:                 if (cmode < -5)
yading@10:                     cmode = -5;
yading@10:             } else if (cmode > 0) {
yading@10:                 cmode =  1 + av_log2(cmode);
yading@10:                 if (cmode > 5)
yading@10:                     cmode = 5;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     code_params = get_vlc2(gb, set->coding_mode.table, set->coding_mode.bits, 2);
yading@10:     if (code_params >= 15) {
yading@10:         add_bits = av_clip((code_params / 5 - 3) / 2, 0, 10);
yading@10:         if (add_bits > 9 && (code_params % 5) != 2)
yading@10:             add_bits--;
yading@10:         range    = 10;
yading@10:         range2   = 21;
yading@10:         code_vlc = set->long_codes + code_params - 15;
yading@10:     } else {
yading@10:         add_bits = 0;
yading@10:         range    = 6;
yading@10:         range2   = 13;
yading@10:         code_vlc = set->short_codes + code_params;
yading@10:     }
yading@10: 
yading@10:     for (i = 0; i < length; i += 2) {
yading@10:         int code1, code2;
yading@10: 
yading@10:         t = get_vlc2(gb, code_vlc->table, code_vlc->bits, 2);
yading@10:         code1 = t / range2;
yading@10:         code2 = t % range2;
yading@10:         dst[i]     = extend_code(gb, code1, range, 0) << add_bits;
yading@10:         dst[i + 1] = extend_code(gb, code2, range, 0) << add_bits;
yading@10:         if (add_bits) {
yading@10:             dst[i]     |= get_bits(gb, add_bits);
yading@10:             dst[i + 1] |= get_bits(gb, add_bits);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void apply_lpc(RALFContext *ctx, int ch, int length, int bits)
yading@10: {
yading@10:     int i, j, acc;
yading@10:     int *audio = ctx->channel_data[ch];
yading@10:     int bias = 1 << (ctx->filter_bits - 1);
yading@10:     int max_clip = (1 << bits) - 1, min_clip = -max_clip - 1;
yading@10: 
yading@10:     for (i = 1; i < length; i++) {
yading@10:         int flen = FFMIN(ctx->filter_length, i);
yading@10: 
yading@10:         acc = 0;
yading@10:         for (j = 0; j < flen; j++)
yading@10:             acc += ctx->filter[j] * audio[i - j - 1];
yading@10:         if (acc < 0) {
yading@10:             acc = (acc + bias - 1) >> ctx->filter_bits;
yading@10:             acc = FFMAX(acc, min_clip);
yading@10:         } else {
yading@10:             acc = (acc + bias) >> ctx->filter_bits;
yading@10:             acc = FFMIN(acc, max_clip);
yading@10:         }
yading@10:         audio[i] += acc;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_block(AVCodecContext *avctx, GetBitContext *gb,
yading@10:                         int16_t *dst0, int16_t *dst1)
yading@10: {
yading@10:     RALFContext *ctx = avctx->priv_data;
yading@10:     int len, ch, ret;
yading@10:     int dmode, mode[2], bits[2];
yading@10:     int *ch0, *ch1;
yading@10:     int i, t, t2;
yading@10: 
yading@10:     len = 12 - get_unary(gb, 0, 6);
yading@10: 
yading@10:     if (len <= 7) len ^= 1; // codes for length = 6 and 7 are swapped
yading@10:     len = 1 << len;
yading@10: 
yading@10:     if (ctx->sample_offset + len > ctx->max_frame_size) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                "Decoder's stomach is crying, it ate too many samples\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (avctx->channels > 1)
yading@10:         dmode = get_bits(gb, 2) + 1;
yading@10:     else
yading@10:         dmode = 0;
yading@10: 
yading@10:     mode[0] = (dmode == 4) ? 1 : 0;
yading@10:     mode[1] = (dmode >= 2) ? 2 : 0;
yading@10:     bits[0] = 16;
yading@10:     bits[1] = (mode[1] == 2) ? 17 : 16;
yading@10: 
yading@10:     for (ch = 0; ch < avctx->channels; ch++) {
yading@10:         if ((ret = decode_channel(ctx, gb, ch, len, mode[ch], bits[ch])) < 0)
yading@10:             return ret;
yading@10:         if (ctx->filter_params > 1 && ctx->filter_params != FILTER_RAW) {
yading@10:             ctx->filter_bits += 3;
yading@10:             apply_lpc(ctx, ch, len, bits[ch]);
yading@10:         }
yading@10:         if (get_bits_left(gb) < 0)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     ch0 = ctx->channel_data[0];
yading@10:     ch1 = ctx->channel_data[1];
yading@10:     switch (dmode) {
yading@10:     case 0:
yading@10:         for (i = 0; i < len; i++)
yading@10:             dst0[i] = ch0[i] + ctx->bias[0];
yading@10:         break;
yading@10:     case 1:
yading@10:         for (i = 0; i < len; i++) {
yading@10:             dst0[i] = ch0[i] + ctx->bias[0];
yading@10:             dst1[i] = ch1[i] + ctx->bias[1];
yading@10:         }
yading@10:         break;
yading@10:     case 2:
yading@10:         for (i = 0; i < len; i++) {
yading@10:             ch0[i] += ctx->bias[0];
yading@10:             dst0[i] = ch0[i];
yading@10:             dst1[i] = ch0[i] - (ch1[i] + ctx->bias[1]);
yading@10:         }
yading@10:         break;
yading@10:     case 3:
yading@10:         for (i = 0; i < len; i++) {
yading@10:             t  = ch0[i] + ctx->bias[0];
yading@10:             t2 = ch1[i] + ctx->bias[1];
yading@10:             dst0[i] = t + t2;
yading@10:             dst1[i] = t;
yading@10:         }
yading@10:         break;
yading@10:     case 4:
yading@10:         for (i = 0; i < len; i++) {
yading@10:             t  =   ch1[i] + ctx->bias[1];
yading@10:             t2 = ((ch0[i] + ctx->bias[0]) << 1) | (t & 1);
yading@10:             dst0[i] = (t2 + t) / 2;
yading@10:             dst1[i] = (t2 - t) / 2;
yading@10:         }
yading@10:         break;
yading@10:     }
yading@10: 
yading@10:     ctx->sample_offset += len;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     RALFContext *ctx = avctx->priv_data;
yading@10:     AVFrame *frame   = data;
yading@10:     int16_t *samples0;
yading@10:     int16_t *samples1;
yading@10:     int ret;
yading@10:     GetBitContext gb;
yading@10:     int table_size, table_bytes, i;
yading@10:     const uint8_t *src, *block_pointer;
yading@10:     int src_size;
yading@10:     int bytes_left;
yading@10: 
yading@10:     if (ctx->has_pkt) {
yading@10:         ctx->has_pkt = 0;
yading@10:         table_bytes = (AV_RB16(avpkt->data) + 7) >> 3;
yading@10:         if (table_bytes + 3 > avpkt->size || avpkt->size > RALF_MAX_PKT_SIZE) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Wrong packet's breath smells of wrong data!\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         if (memcmp(ctx->pkt, avpkt->data, 2 + table_bytes)) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Wrong packet tails are wrong!\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         src      = ctx->pkt;
yading@10:         src_size = RALF_MAX_PKT_SIZE + avpkt->size;
yading@10:         memcpy(ctx->pkt + RALF_MAX_PKT_SIZE, avpkt->data + 2 + table_bytes,
yading@10:                avpkt->size - 2 - table_bytes);
yading@10:     } else {
yading@10:         if (avpkt->size == RALF_MAX_PKT_SIZE) {
yading@10:             memcpy(ctx->pkt, avpkt->data, avpkt->size);
yading@10:             ctx->has_pkt   = 1;
yading@10:             *got_frame_ptr = 0;
yading@10: 
yading@10:             return avpkt->size;
yading@10:         }
yading@10:         src      = avpkt->data;
yading@10:         src_size = avpkt->size;
yading@10:     }
yading@10: 
yading@10:     frame->nb_samples = ctx->max_frame_size;
yading@10:     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
yading@10:         return ret;
yading@10:     samples0 = (int16_t *)frame->data[0];
yading@10:     samples1 = (int16_t *)frame->data[1];
yading@10: 
yading@10:     if (src_size < 5) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "too short packets are too short!\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     table_size  = AV_RB16(src);
yading@10:     table_bytes = (table_size + 7) >> 3;
yading@10:     if (src_size < table_bytes + 3) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "short packets are short!\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     init_get_bits(&gb, src + 2, table_size);
yading@10:     ctx->num_blocks = 0;
yading@10:     while (get_bits_left(&gb) > 0) {
yading@10:         ctx->block_size[ctx->num_blocks] = get_bits(&gb, 15);
yading@10:         if (get_bits1(&gb)) {
yading@10:             ctx->block_pts[ctx->num_blocks] = get_bits(&gb, 9);
yading@10:         } else {
yading@10:             ctx->block_pts[ctx->num_blocks] = 0;
yading@10:         }
yading@10:         ctx->num_blocks++;
yading@10:     }
yading@10: 
yading@10:     block_pointer = src      + table_bytes + 2;
yading@10:     bytes_left    = src_size - table_bytes - 2;
yading@10:     ctx->sample_offset = 0;
yading@10:     for (i = 0; i < ctx->num_blocks; i++) {
yading@10:         if (bytes_left < ctx->block_size[i]) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "I'm pedaling backwards\n");
yading@10:             break;
yading@10:         }
yading@10:         init_get_bits(&gb, block_pointer, ctx->block_size[i] * 8);
yading@10:         if (decode_block(avctx, &gb, samples0 + ctx->sample_offset,
yading@10:                                      samples1 + ctx->sample_offset) < 0) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Sir, I got carsick in your office. Not decoding the rest of packet.\n");
yading@10:             break;
yading@10:         }
yading@10:         block_pointer += ctx->block_size[i];
yading@10:         bytes_left    -= ctx->block_size[i];
yading@10:     }
yading@10: 
yading@10:     frame->nb_samples = ctx->sample_offset;
yading@10:     *got_frame_ptr    = ctx->sample_offset > 0;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: static void decode_flush(AVCodecContext *avctx)
yading@10: {
yading@10:     RALFContext *ctx = avctx->priv_data;
yading@10: 
yading@10:     ctx->has_pkt = 0;
yading@10: }
yading@10: 
yading@10: 
yading@10: AVCodec ff_ralf_decoder = {
yading@10:     .name           = "ralf",
yading@10:     .type           = AVMEDIA_TYPE_AUDIO,
yading@10:     .id             = AV_CODEC_ID_RALF,
yading@10:     .priv_data_size = sizeof(RALFContext),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_close,
yading@10:     .decode         = decode_frame,
yading@10:     .flush          = decode_flush,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("RealAudio Lossless"),
yading@10:     .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
yading@10:                                                       AV_SAMPLE_FMT_NONE },
yading@10: };