rename flac.c to flacdec.c

Originally committed as revision 16735 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 0 insertions, 795 deletions

diff --git a/libavcodec/flac.c b/libavcodec/flac.c
deleted file mode 100644
index 30e58fbce6..0000000000
--- a/libavcodec/flac.c
+++ /dev/null
@@ -1,795 +0,0 @@
-/*
- * FLAC (Free Lossless Audio Codec) decoder
- * Copyright (c) 2003 Alex Beregszaszi
- *
- * 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 flac.c
- * FLAC (Free Lossless Audio Codec) decoder
- * @author Alex Beregszaszi
- *
- * For more information on the FLAC format, visit:
- *  http://flac.sourceforge.net/
- *
- * This decoder can be used in 1 of 2 ways: Either raw FLAC data can be fed
- * through, starting from the initial 'fLaC' signature; or by passing the
- * 34-byte streaminfo structure through avctx->extradata[_size] followed
- * by data starting with the 0xFFF8 marker.
- */
-
-#include <limits.h>
-
-#define ALT_BITSTREAM_READER
-#include "libavutil/crc.h"
-#include "avcodec.h"
-#include "bitstream.h"
-#include "golomb.h"
-#include "flac.h"
-
-#undef NDEBUG
-#include <assert.h>
-
-#define MAX_CHANNELS 8
-#define MAX_BLOCKSIZE 65535
-#define FLAC_STREAMINFO_SIZE 34
-
-enum decorrelation_type {
-    INDEPENDENT,
-    LEFT_SIDE,
-    RIGHT_SIDE,
-    MID_SIDE,
-};
-
-typedef struct FLACContext {
-    FLACSTREAMINFO
-
-    AVCodecContext *avctx;
-    GetBitContext gb;
-
-    int blocksize/*, last_blocksize*/;
-    int curr_bps;
-    enum decorrelation_type decorrelation;
-
-    int32_t *decoded[MAX_CHANNELS];
-    uint8_t *bitstream;
-    unsigned int bitstream_size;
-    unsigned int bitstream_index;
-    unsigned int allocated_bitstream_size;
-} FLACContext;
-
-#define METADATA_TYPE_STREAMINFO 0
-
-static const int sample_rate_table[] =
-{ 0,
-  88200, 176400, 192000,
-  8000, 16000, 22050, 24000, 32000, 44100, 48000, 96000,
-  0, 0, 0, 0 };
-
-static const int sample_size_table[] =
-{ 0, 8, 12, 0, 16, 20, 24, 0 };
-
-static const int blocksize_table[] = {
-     0,    192, 576<<0, 576<<1, 576<<2, 576<<3,      0,      0,
-256<<0, 256<<1, 256<<2, 256<<3, 256<<4, 256<<5, 256<<6, 256<<7
-};
-
-static int64_t get_utf8(GetBitContext *gb){
-    int64_t val;
-    GET_UTF8(val, get_bits(gb, 8), return -1;)
-    return val;
-}
-
-static void allocate_buffers(FLACContext *s);
-static int metadata_parse(FLACContext *s);
-
-static av_cold int flac_decode_init(AVCodecContext * avctx)
-{
-    FLACContext *s = avctx->priv_data;
-    s->avctx = avctx;
-
-    if (avctx->extradata_size > 4) {
-        /* initialize based on the demuxer-supplied streamdata header */
-        if (avctx->extradata_size == FLAC_STREAMINFO_SIZE) {
-            ff_flac_parse_streaminfo(avctx, (FLACStreaminfo *)s, avctx->extradata);
-            allocate_buffers(s);
-        } else {
-            init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
-            metadata_parse(s);
-        }
-    }
-
-    avctx->sample_fmt = SAMPLE_FMT_S16;
-    return 0;
-}
-
-static void dump_headers(AVCodecContext *avctx, FLACStreaminfo *s)
-{
-    av_log(avctx, AV_LOG_DEBUG, "  Blocksize: %d .. %d\n", s->min_blocksize, s->max_blocksize);
-    av_log(avctx, AV_LOG_DEBUG, "  Max Framesize: %d\n", s->max_framesize);
-    av_log(avctx, AV_LOG_DEBUG, "  Samplerate: %d\n", s->samplerate);
-    av_log(avctx, AV_LOG_DEBUG, "  Channels: %d\n", s->channels);
-    av_log(avctx, AV_LOG_DEBUG, "  Bits: %d\n", s->bps);
-}
-
-static void allocate_buffers(FLACContext *s){
-    int i;
-
-    assert(s->max_blocksize);
-
-    if(s->max_framesize == 0 && s->max_blocksize){
-        s->max_framesize= (s->channels * s->bps * s->max_blocksize + 7)/ 8; //FIXME header overhead
-    }
-
-    for (i = 0; i < s->channels; i++)
-    {
-        s->decoded[i] = av_realloc(s->decoded[i], sizeof(int32_t)*s->max_blocksize);
-    }
-
-    if(s->allocated_bitstream_size < s->max_framesize)
-        s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
-}
-
-void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
-                              const uint8_t *buffer)
-{
-    GetBitContext gb;
-    init_get_bits(&gb, buffer, FLAC_STREAMINFO_SIZE*8);
-
-    /* mandatory streaminfo */
-    s->min_blocksize = get_bits(&gb, 16);
-    s->max_blocksize = get_bits(&gb, 16);
-
-    skip_bits(&gb, 24); /* skip min frame size */
-    s->max_framesize = get_bits_long(&gb, 24);
-
-    s->samplerate = get_bits_long(&gb, 20);
-    s->channels = get_bits(&gb, 3) + 1;
-    s->bps = get_bits(&gb, 5) + 1;
-
-    avctx->channels = s->channels;
-    avctx->sample_rate = s->samplerate;
-
-    skip_bits(&gb, 36); /* total num of samples */
-
-    skip_bits(&gb, 64); /* md5 sum */
-    skip_bits(&gb, 64); /* md5 sum */
-
-    dump_headers(avctx, s);
-}
-
-/**
- * Parse a list of metadata blocks. This list of blocks must begin with
- * the fLaC marker.
- * @param s the flac decoding context containing the gb bit reader used to
- *          parse metadata
- * @return 1 if some metadata was read, 0 if no fLaC marker was found
- */
-static int metadata_parse(FLACContext *s)
-{
-    int i, metadata_last, metadata_type, metadata_size, streaminfo_updated=0;
-    int initial_pos= get_bits_count(&s->gb);
-
-    if (show_bits_long(&s->gb, 32) == MKBETAG('f','L','a','C')) {
-        skip_bits(&s->gb, 32);
-
-        av_log(s->avctx, AV_LOG_DEBUG, "STREAM HEADER\n");
-        do {
-            metadata_last = get_bits1(&s->gb);
-            metadata_type = get_bits(&s->gb, 7);
-            metadata_size = get_bits_long(&s->gb, 24);
-
-            if(get_bits_count(&s->gb) + 8*metadata_size > s->gb.size_in_bits){
-                skip_bits_long(&s->gb, initial_pos - get_bits_count(&s->gb));
-                break;
-            }
-
-            av_log(s->avctx, AV_LOG_DEBUG,
-                   " metadata block: flag = %d, type = %d, size = %d\n",
-                   metadata_last, metadata_type, metadata_size);
-            if (metadata_size) {
-                switch (metadata_type) {
-                case METADATA_TYPE_STREAMINFO:
-                    ff_flac_parse_streaminfo(s->avctx, (FLACStreaminfo *)s, s->gb.buffer+get_bits_count(&s->gb)/8);
-                    streaminfo_updated = 1;
-
-                default:
-                    for (i=0; i<metadata_size; i++)
-                        skip_bits(&s->gb, 8);
-                }
-            }
-        } while (!metadata_last);
-
-        if (streaminfo_updated)
-            allocate_buffers(s);
-        return 1;
-    }
-    return 0;
-}
-
-static int decode_residuals(FLACContext *s, int channel, int pred_order)
-{
-    int i, tmp, partition, method_type, rice_order;
-    int sample = 0, samples;
-
-    method_type = get_bits(&s->gb, 2);
-    if (method_type > 1){
-        av_log(s->avctx, AV_LOG_DEBUG, "illegal residual coding method %d\n", method_type);
-        return -1;
-    }
-
-    rice_order = get_bits(&s->gb, 4);
-
-    samples= s->blocksize >> rice_order;
-    if (pred_order > samples) {
-        av_log(s->avctx, AV_LOG_ERROR, "invalid predictor order: %i > %i\n", pred_order, samples);
-        return -1;
-    }
-
-    sample=
-    i= pred_order;
-    for (partition = 0; partition < (1 << rice_order); partition++)
-    {
-        tmp = get_bits(&s->gb, method_type == 0 ? 4 : 5);
-        if (tmp == (method_type == 0 ? 15 : 31))
-        {
-            av_log(s->avctx, AV_LOG_DEBUG, "fixed len partition\n");
-            tmp = get_bits(&s->gb, 5);
-            for (; i < samples; i++, sample++)
-                s->decoded[channel][sample] = get_sbits(&s->gb, tmp);
-        }
-        else
-        {
-//            av_log(s->avctx, AV_LOG_DEBUG, "rice coded partition k=%d\n", tmp);
-            for (; i < samples; i++, sample++){
-                s->decoded[channel][sample] = get_sr_golomb_flac(&s->gb, tmp, INT_MAX, 0);
-            }
-        }
-        i= 0;
-    }
-
-//    av_log(s->avctx, AV_LOG_DEBUG, "partitions: %d, samples: %d\n", 1 << rice_order, sample);
-
-    return 0;
-}
-
-static int decode_subframe_fixed(FLACContext *s, int channel, int pred_order)
-{
-    const int blocksize = s->blocksize;
-    int32_t *decoded = s->decoded[channel];
-    int a, b, c, d, i;
-
-//    av_log(s->avctx, AV_LOG_DEBUG, "  SUBFRAME FIXED\n");
-
-    /* warm up samples */
-//    av_log(s->avctx, AV_LOG_DEBUG, "   warm up samples: %d\n", pred_order);
-
-    for (i = 0; i < pred_order; i++)
-    {
-        decoded[i] = get_sbits(&s->gb, s->curr_bps);
-//        av_log(s->avctx, AV_LOG_DEBUG, "    %d: %d\n", i, s->decoded[channel][i]);
-    }
-
-    if (decode_residuals(s, channel, pred_order) < 0)
-        return -1;
-
-    if(pred_order > 0)
-        a = decoded[pred_order-1];
-    if(pred_order > 1)
-        b = a - decoded[pred_order-2];
-    if(pred_order > 2)
-        c = b - decoded[pred_order-2] + decoded[pred_order-3];
-    if(pred_order > 3)
-        d = c - decoded[pred_order-2] + 2*decoded[pred_order-3] - decoded[pred_order-4];
-
-    switch(pred_order)
-    {
-        case 0:
-            break;
-        case 1:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += decoded[i];
-            break;
-        case 2:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += b += decoded[i];
-            break;
-        case 3:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += b += c += decoded[i];
-            break;
-        case 4:
-            for (i = pred_order; i < blocksize; i++)
-                decoded[i] = a += b += c += d += decoded[i];
-            break;
-        default:
-            av_log(s->avctx, AV_LOG_ERROR, "illegal pred order %d\n", pred_order);
-            return -1;
-    }
-
-    return 0;
-}
-
-static int decode_subframe_lpc(FLACContext *s, int channel, int pred_order)
-{
-    int i, j;
-    int coeff_prec, qlevel;
-    int coeffs[pred_order];
-    int32_t *decoded = s->decoded[channel];
-
-//    av_log(s->avctx, AV_LOG_DEBUG, "  SUBFRAME LPC\n");
-
-    /* warm up samples */
-//    av_log(s->avctx, AV_LOG_DEBUG, "   warm up samples: %d\n", pred_order);
-
-    for (i = 0; i < pred_order; i++)
-    {
-        decoded[i] = get_sbits(&s->gb, s->curr_bps);
-//        av_log(s->avctx, AV_LOG_DEBUG, "    %d: %d\n", i, decoded[i]);
-    }
-
-    coeff_prec = get_bits(&s->gb, 4) + 1;
-    if (coeff_prec == 16)
-    {
-        av_log(s->avctx, AV_LOG_DEBUG, "invalid coeff precision\n");
-        return -1;
-    }
-//    av_log(s->avctx, AV_LOG_DEBUG, "   qlp coeff prec: %d\n", coeff_prec);
-    qlevel = get_sbits(&s->gb, 5);
-//    av_log(s->avctx, AV_LOG_DEBUG, "   quant level: %d\n", qlevel);
-    if(qlevel < 0){
-        av_log(s->avctx, AV_LOG_DEBUG, "qlevel %d not supported, maybe buggy stream\n", qlevel);
-        return -1;
-    }
-
-    for (i = 0; i < pred_order; i++)
-    {
-        coeffs[i] = get_sbits(&s->gb, coeff_prec);
-//        av_log(s->avctx, AV_LOG_DEBUG, "    %d: %d\n", i, coeffs[i]);
-    }
-
-    if (decode_residuals(s, channel, pred_order) < 0)
-        return -1;
-
-    if (s->bps > 16) {
-        int64_t sum;
-        for (i = pred_order; i < s->blocksize; i++)
-        {
-            sum = 0;
-            for (j = 0; j < pred_order; j++)
-                sum += (int64_t)coeffs[j] * decoded[i-j-1];
-            decoded[i] += sum >> qlevel;
-        }
-    } else {
-        for (i = pred_order; i < s->blocksize-1; i += 2)
-        {
-            int c;
-            int d = decoded[i-pred_order];
-            int s0 = 0, s1 = 0;
-            for (j = pred_order-1; j > 0; j--)
-            {
-                c = coeffs[j];
-                s0 += c*d;
-                d = decoded[i-j];
-                s1 += c*d;
-            }
-            c = coeffs[0];
-            s0 += c*d;
-            d = decoded[i] += s0 >> qlevel;
-            s1 += c*d;
-            decoded[i+1] += s1 >> qlevel;
-        }
-        if (i < s->blocksize)
-        {
-            int sum = 0;
-            for (j = 0; j < pred_order; j++)
-                sum += coeffs[j] * decoded[i-j-1];
-            decoded[i] += sum >> qlevel;
-        }
-    }
-
-    return 0;
-}
-
-static inline int decode_subframe(FLACContext *s, int channel)
-{
-    int type, wasted = 0;
-    int i, tmp;
-
-    s->curr_bps = s->bps;
-    if(channel == 0){
-        if(s->decorrelation == RIGHT_SIDE)
-            s->curr_bps++;
-    }else{
-        if(s->decorrelation == LEFT_SIDE || s->decorrelation == MID_SIDE)
-            s->curr_bps++;
-    }
-
-    if (get_bits1(&s->gb))
-    {
-        av_log(s->avctx, AV_LOG_ERROR, "invalid subframe padding\n");
-        return -1;
-    }
-    type = get_bits(&s->gb, 6);
-//    wasted = get_bits1(&s->gb);
-
-//    if (wasted)
-//    {
-//        while (!get_bits1(&s->gb))
-//            wasted++;
-//        if (wasted)
-//            wasted++;
-//        s->curr_bps -= wasted;
-//    }
-#if 0
-    wasted= 16 - av_log2(show_bits(&s->gb, 17));
-    skip_bits(&s->gb, wasted+1);
-    s->curr_bps -= wasted;
-#else
-    if (get_bits1(&s->gb))
-    {
-        wasted = 1;
-        while (!get_bits1(&s->gb))
-            wasted++;
-        s->curr_bps -= wasted;
-        av_log(s->avctx, AV_LOG_DEBUG, "%d wasted bits\n", wasted);
-    }
-#endif
-//FIXME use av_log2 for types
-    if (type == 0)
-    {
-        av_log(s->avctx, AV_LOG_DEBUG, "coding type: constant\n");
-        tmp = get_sbits(&s->gb, s->curr_bps);
-        for (i = 0; i < s->blocksize; i++)
-            s->decoded[channel][i] = tmp;
-    }
-    else if (type == 1)
-    {
-        av_log(s->avctx, AV_LOG_DEBUG, "coding type: verbatim\n");
-        for (i = 0; i < s->blocksize; i++)
-            s->decoded[channel][i] = get_sbits(&s->gb, s->curr_bps);
-    }
-    else if ((type >= 8) && (type <= 12))
-    {
-//        av_log(s->avctx, AV_LOG_DEBUG, "coding type: fixed\n");
-        if (decode_subframe_fixed(s, channel, type & ~0x8) < 0)
-            return -1;
-    }
-    else if (type >= 32)
-    {
-//        av_log(s->avctx, AV_LOG_DEBUG, "coding type: lpc\n");
-        if (decode_subframe_lpc(s, channel, (type & ~0x20)+1) < 0)
-            return -1;
-    }
-    else
-    {
-        av_log(s->avctx, AV_LOG_ERROR, "invalid coding type\n");
-        return -1;
-    }
-
-    if (wasted)
-    {
-        int i;
-        for (i = 0; i < s->blocksize; i++)
-            s->decoded[channel][i] <<= wasted;
-    }
-
-    return 0;
-}
-
-static int decode_frame(FLACContext *s, int alloc_data_size)
-{
-    int blocksize_code, sample_rate_code, sample_size_code, assignment, i, crc8;
-    int decorrelation, bps, blocksize, samplerate;
-
-    blocksize_code = get_bits(&s->gb, 4);
-
-    sample_rate_code = get_bits(&s->gb, 4);
-
-    assignment = get_bits(&s->gb, 4); /* channel assignment */
-    if (assignment < 8 && s->channels == assignment+1)
-        decorrelation = INDEPENDENT;
-    else if (assignment >=8 && assignment < 11 && s->channels == 2)
-        decorrelation = LEFT_SIDE + assignment - 8;
-    else
-    {
-        av_log(s->avctx, AV_LOG_ERROR, "unsupported channel assignment %d (channels=%d)\n", assignment, s->channels);
-        return -1;
-    }
-
-    sample_size_code = get_bits(&s->gb, 3);
-    if(sample_size_code == 0)
-        bps= s->bps;
-    else if((sample_size_code != 3) && (sample_size_code != 7))
-        bps = sample_size_table[sample_size_code];
-    else
-    {
-        av_log(s->avctx, AV_LOG_ERROR, "invalid sample size code (%d)\n", sample_size_code);
-        return -1;
-    }
-
-    if (get_bits1(&s->gb))
-    {
-        av_log(s->avctx, AV_LOG_ERROR, "broken stream, invalid padding\n");
-        return -1;
-    }
-
-    if(get_utf8(&s->gb) < 0){
-        av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n");
-        return -1;
-    }
-#if 0
-    if (/*((blocksize_code == 6) || (blocksize_code == 7)) &&*/
-        (s->min_blocksize != s->max_blocksize)){
-    }else{
-    }
-#endif
-
-    if (blocksize_code == 0)
-        blocksize = s->min_blocksize;
-    else if (blocksize_code == 6)
-        blocksize = get_bits(&s->gb, 8)+1;
-    else if (blocksize_code == 7)
-        blocksize = get_bits(&s->gb, 16)+1;
-    else
-        blocksize = blocksize_table[blocksize_code];
-
-    if(blocksize > s->max_blocksize){
-        av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize, s->max_blocksize);
-        return -1;
-    }
-
-    if(blocksize * s->channels * sizeof(int16_t) > alloc_data_size)
-        return -1;
-
-    if (sample_rate_code == 0){
-        samplerate= s->samplerate;
-    }else if (sample_rate_code < 12)
-        samplerate = sample_rate_table[sample_rate_code];
-    else if (sample_rate_code == 12)
-        samplerate = get_bits(&s->gb, 8) * 1000;
-    else if (sample_rate_code == 13)
-        samplerate = get_bits(&s->gb, 16);
-    else if (sample_rate_code == 14)
-        samplerate = get_bits(&s->gb, 16) * 10;
-    else{
-        av_log(s->avctx, AV_LOG_ERROR, "illegal sample rate code %d\n", sample_rate_code);
-        return -1;
-    }
-
-    skip_bits(&s->gb, 8);
-    crc8 = av_crc(av_crc_get_table(AV_CRC_8_ATM), 0,
-                  s->gb.buffer, get_bits_count(&s->gb)/8);
-    if(crc8){
-        av_log(s->avctx, AV_LOG_ERROR, "header crc mismatch crc=%2X\n", crc8);
-        return -1;
-    }
-
-    s->blocksize    = blocksize;
-    s->samplerate   = samplerate;
-    s->bps          = bps;
-    s->decorrelation= decorrelation;
-
-//    dump_headers(s->avctx, (FLACStreaminfo *)s);
-
-    /* subframes */
-    for (i = 0; i < s->channels; i++)
-    {
-//        av_log(s->avctx, AV_LOG_DEBUG, "decoded: %x residual: %x\n", s->decoded[i], s->residual[i]);
-        if (decode_subframe(s, i) < 0)
-            return -1;
-    }
-
-    align_get_bits(&s->gb);
-
-    /* frame footer */
-    skip_bits(&s->gb, 16); /* data crc */
-
-    return 0;
-}
-
-static int flac_decode_frame(AVCodecContext *avctx,
-                            void *data, int *data_size,
-                            const uint8_t *buf, int buf_size)
-{
-    FLACContext *s = avctx->priv_data;
-    int tmp = 0, i, j = 0, input_buf_size = 0;
-    int16_t *samples = data;
-    int alloc_data_size= *data_size;
-
-    *data_size=0;
-
-    if(s->max_framesize == 0){
-        s->max_framesize= FFMAX(4, buf_size); // should hopefully be enough for the first header
-        s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize);
-    }
-
-    if(1 && s->max_framesize){//FIXME truncated
-            if(s->bitstream_size < 4 || AV_RL32(s->bitstream) != MKTAG('f','L','a','C'))
-                buf_size= FFMIN(buf_size, s->max_framesize - FFMIN(s->bitstream_size, s->max_framesize));
-            input_buf_size= buf_size;
-
-            if(s->bitstream_size + buf_size < buf_size || s->bitstream_index + s->bitstream_size + buf_size < s->bitstream_index)
-                return -1;
-
-            if(s->allocated_bitstream_size < s->bitstream_size + buf_size)
-                s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->bitstream_size + buf_size);
-
-            if(s->bitstream_index + s->bitstream_size + buf_size > s->allocated_bitstream_size){
-//                printf("memmove\n");
-                memmove(s->bitstream, &s->bitstream[s->bitstream_index], s->bitstream_size);
-                s->bitstream_index=0;
-            }
-            memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf, buf_size);
-            buf= &s->bitstream[s->bitstream_index];
-            buf_size += s->bitstream_size;
-            s->bitstream_size= buf_size;
-
-            if(buf_size < s->max_framesize && input_buf_size){
-//                printf("wanna more data ...\n");
-                return input_buf_size;
-            }
-    }
-
-    init_get_bits(&s->gb, buf, buf_size*8);
-
-    if(metadata_parse(s))
-        goto end;
-
-        tmp = show_bits(&s->gb, 16);
-        if((tmp & 0xFFFE) != 0xFFF8){
-            av_log(s->avctx, AV_LOG_ERROR, "FRAME HEADER not here\n");
-            while(get_bits_count(&s->gb)/8+2 < buf_size && (show_bits(&s->gb, 16) & 0xFFFE) != 0xFFF8)
-                skip_bits(&s->gb, 8);
-            goto end; // we may not have enough bits left to decode a frame, so try next time
-        }
-        skip_bits(&s->gb, 16);
-        if (decode_frame(s, alloc_data_size) < 0){
-            av_log(s->avctx, AV_LOG_ERROR, "decode_frame() failed\n");
-            s->bitstream_size=0;
-            s->bitstream_index=0;
-            return -1;
-        }
-
-
-#if 0
-    /* fix the channel order here */
-    if (s->order == MID_SIDE)
-    {
-        short *left = samples;
-        short *right = samples + s->blocksize;
-        for (i = 0; i < s->blocksize; i += 2)
-        {
-            uint32_t x = s->decoded[0][i];
-            uint32_t y = s->decoded[0][i+1];
-
-            right[i] = x - (y / 2);
-            left[i] = right[i] + y;
-        }
-        *data_size = 2 * s->blocksize;
-    }
-    else
-    {
-    for (i = 0; i < s->channels; i++)
-    {
-        switch(s->order)
-        {
-            case INDEPENDENT:
-                for (j = 0; j < s->blocksize; j++)
-                    samples[(s->blocksize*i)+j] = s->decoded[i][j];
-                break;
-            case LEFT_SIDE:
-            case RIGHT_SIDE:
-                if (i == 0)
-                    for (j = 0; j < s->blocksize; j++)
-                        samples[(s->blocksize*i)+j] = s->decoded[0][j];
-                else
-                    for (j = 0; j < s->blocksize; j++)
-                        samples[(s->blocksize*i)+j] = s->decoded[0][j] - s->decoded[i][j];
-                break;
-//            case MID_SIDE:
-//                av_log(s->avctx, AV_LOG_DEBUG, "mid-side unsupported\n");
-        }
-        *data_size += s->blocksize;
-    }
-    }
-#else
-#define DECORRELATE(left, right)\
-            assert(s->channels == 2);\
-            for (i = 0; i < s->blocksize; i++)\
-            {\
-                int a= s->decoded[0][i];\
-                int b= s->decoded[1][i];\
-                *samples++ = ((left)  << (24 - s->bps)) >> 8;\
-                *samples++ = ((right) << (24 - s->bps)) >> 8;\
-            }\
-            break;
-
-    switch(s->decorrelation)
-    {
-        case INDEPENDENT:
-            for (j = 0; j < s->blocksize; j++)
-            {
-                for (i = 0; i < s->channels; i++)
-                    *samples++ = (s->decoded[i][j] << (24 - s->bps)) >> 8;
-            }
-            break;
-        case LEFT_SIDE:
-            DECORRELATE(a,a-b)
-        case RIGHT_SIDE:
-            DECORRELATE(a+b,b)
-        case MID_SIDE:
-            DECORRELATE( (a-=b>>1) + b, a)
-    }
-#endif
-
-    *data_size = (int8_t *)samples - (int8_t *)data;
-//    av_log(s->avctx, AV_LOG_DEBUG, "data size: %d\n", *data_size);
-
-//    s->last_blocksize = s->blocksize;
-end:
-    i= (get_bits_count(&s->gb)+7)/8;
-    if(i > buf_size){
-        av_log(s->avctx, AV_LOG_ERROR, "overread: %d\n", i - buf_size);
-        s->bitstream_size=0;
-        s->bitstream_index=0;
-        return -1;
-    }
-
-    if(s->bitstream_size){
-        s->bitstream_index += i;
-        s->bitstream_size  -= i;
-        return input_buf_size;
-    }else
-        return i;
-}
-
-static av_cold int flac_decode_close(AVCodecContext *avctx)
-{
-    FLACContext *s = avctx->priv_data;
-    int i;
-
-    for (i = 0; i < s->channels; i++)
-    {
-        av_freep(&s->decoded[i]);
-    }
-    av_freep(&s->bitstream);
-
-    return 0;
-}
-
-static void flac_flush(AVCodecContext *avctx){
-    FLACContext *s = avctx->priv_data;
-
-    s->bitstream_size=
-    s->bitstream_index= 0;
-}
-
-AVCodec flac_decoder = {
-    "flac",
-    CODEC_TYPE_AUDIO,
-    CODEC_ID_FLAC,
-    sizeof(FLACContext),
-    flac_decode_init,
-    NULL,
-    flac_decode_close,
-    flac_decode_frame,
-    CODEC_CAP_DELAY,
-    .flush= flac_flush,
-    .long_name= NULL_IF_CONFIG_SMALL("FLAC (Free Lossless Audio Codec)"),
-};