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674 lines
21 KiB
674 lines
21 KiB
/* |
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* Shorten decoder |
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* Copyright (c) 2005 Jeff Muizelaar |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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|
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/** |
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* @file |
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* Shorten decoder |
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* @author Jeff Muizelaar |
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* |
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*/ |
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#include <limits.h> |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "get_bits.h" |
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#include "golomb.h" |
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#include "internal.h" |
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|
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#define MAX_CHANNELS 8 |
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#define MAX_BLOCKSIZE 65535 |
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#define OUT_BUFFER_SIZE 16384 |
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#define ULONGSIZE 2 |
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#define WAVE_FORMAT_PCM 0x0001 |
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#define DEFAULT_BLOCK_SIZE 256 |
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#define TYPESIZE 4 |
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#define CHANSIZE 0 |
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#define LPCQSIZE 2 |
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#define ENERGYSIZE 3 |
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#define BITSHIFTSIZE 2 |
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#define TYPE_S8 1 |
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#define TYPE_U8 2 |
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#define TYPE_S16HL 3 |
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#define TYPE_U16HL 4 |
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#define TYPE_S16LH 5 |
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#define TYPE_U16LH 6 |
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#define NWRAP 3 |
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#define NSKIPSIZE 1 |
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#define LPCQUANT 5 |
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#define V2LPCQOFFSET (1 << LPCQUANT) |
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#define FNSIZE 2 |
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#define FN_DIFF0 0 |
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#define FN_DIFF1 1 |
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#define FN_DIFF2 2 |
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#define FN_DIFF3 3 |
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#define FN_QUIT 4 |
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#define FN_BLOCKSIZE 5 |
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#define FN_BITSHIFT 6 |
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#define FN_QLPC 7 |
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#define FN_ZERO 8 |
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#define FN_VERBATIM 9 |
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/** indicates if the FN_* command is audio or non-audio */ |
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static const uint8_t is_audio_command[10] = { 1, 1, 1, 1, 0, 0, 0, 1, 1, 0 }; |
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#define VERBATIM_CKSIZE_SIZE 5 |
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#define VERBATIM_BYTE_SIZE 8 |
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#define CANONICAL_HEADER_SIZE 44 |
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typedef struct ShortenContext { |
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AVCodecContext *avctx; |
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GetBitContext gb; |
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int min_framesize, max_framesize; |
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unsigned channels; |
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int32_t *decoded[MAX_CHANNELS]; |
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int32_t *decoded_base[MAX_CHANNELS]; |
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int32_t *offset[MAX_CHANNELS]; |
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int *coeffs; |
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uint8_t *bitstream; |
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int bitstream_size; |
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int bitstream_index; |
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unsigned int allocated_bitstream_size; |
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int header_size; |
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uint8_t header[OUT_BUFFER_SIZE]; |
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int version; |
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int cur_chan; |
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int bitshift; |
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int nmean; |
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int internal_ftype; |
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int nwrap; |
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int blocksize; |
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int bitindex; |
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int32_t lpcqoffset; |
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int got_header; |
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int got_quit_command; |
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} ShortenContext; |
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static av_cold int shorten_decode_init(AVCodecContext *avctx) |
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{ |
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ShortenContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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return 0; |
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} |
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static int allocate_buffers(ShortenContext *s) |
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{ |
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int i, chan, err; |
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for (chan = 0; chan < s->channels; chan++) { |
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if (FFMAX(1, s->nmean) >= UINT_MAX / sizeof(int32_t)) { |
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av_log(s->avctx, AV_LOG_ERROR, "nmean too large\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if (s->blocksize + s->nwrap >= UINT_MAX / sizeof(int32_t) || |
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s->blocksize + s->nwrap <= (unsigned)s->nwrap) { |
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av_log(s->avctx, AV_LOG_ERROR, |
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"s->blocksize + s->nwrap too large\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if ((err = av_reallocp(&s->offset[chan], |
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sizeof(int32_t) * |
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FFMAX(1, s->nmean))) < 0) |
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return err; |
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if ((err = av_reallocp(&s->decoded_base[chan], (s->blocksize + s->nwrap) * |
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sizeof(s->decoded_base[0][0]))) < 0) |
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return err; |
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for (i = 0; i < s->nwrap; i++) |
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s->decoded_base[chan][i] = 0; |
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s->decoded[chan] = s->decoded_base[chan] + s->nwrap; |
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} |
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if ((err = av_reallocp(&s->coeffs, s->nwrap * sizeof(*s->coeffs))) < 0) |
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return err; |
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return 0; |
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} |
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static inline unsigned int get_uint(ShortenContext *s, int k) |
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{ |
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if (s->version != 0) |
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k = get_ur_golomb_shorten(&s->gb, ULONGSIZE); |
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return get_ur_golomb_shorten(&s->gb, k); |
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} |
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static void fix_bitshift(ShortenContext *s, int32_t *buffer) |
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{ |
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int i; |
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if (s->bitshift != 0) |
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for (i = 0; i < s->blocksize; i++) |
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buffer[i] <<= s->bitshift; |
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} |
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static int init_offset(ShortenContext *s) |
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{ |
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int32_t mean = 0; |
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int chan, i; |
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int nblock = FFMAX(1, s->nmean); |
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/* initialise offset */ |
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switch (s->internal_ftype) { |
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case TYPE_U8: |
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s->avctx->sample_fmt = AV_SAMPLE_FMT_U8P; |
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mean = 0x80; |
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break; |
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case TYPE_S16HL: |
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case TYPE_S16LH: |
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s->avctx->sample_fmt = AV_SAMPLE_FMT_S16P; |
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break; |
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default: |
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av_log(s->avctx, AV_LOG_ERROR, "unknown audio type\n"); |
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return AVERROR_PATCHWELCOME; |
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} |
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for (chan = 0; chan < s->channels; chan++) |
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for (i = 0; i < nblock; i++) |
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s->offset[chan][i] = mean; |
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return 0; |
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} |
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static int decode_wave_header(AVCodecContext *avctx, const uint8_t *header, |
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int header_size) |
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{ |
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int len, bps; |
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short wave_format; |
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GetByteContext gb; |
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bytestream2_init(&gb, header, header_size); |
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if (bytestream2_get_le32(&gb) != MKTAG('R', 'I', 'F', 'F')) { |
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av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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bytestream2_skip(&gb, 4); /* chunk size */ |
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if (bytestream2_get_le32(&gb) != MKTAG('W', 'A', 'V', 'E')) { |
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av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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while (bytestream2_get_le32(&gb) != MKTAG('f', 'm', 't', ' ')) { |
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len = bytestream2_get_le32(&gb); |
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bytestream2_skip(&gb, len); |
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if (len < 0 || bytestream2_get_bytes_left(&gb) < 16) { |
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av_log(avctx, AV_LOG_ERROR, "no fmt chunk found\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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} |
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len = bytestream2_get_le32(&gb); |
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if (len < 16) { |
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av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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wave_format = bytestream2_get_le16(&gb); |
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switch (wave_format) { |
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case WAVE_FORMAT_PCM: |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n"); |
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return AVERROR(ENOSYS); |
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} |
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bytestream2_skip(&gb, 2); // skip channels (already got from shorten header) |
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avctx->sample_rate = bytestream2_get_le32(&gb); |
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bytestream2_skip(&gb, 4); // skip bit rate (represents original uncompressed bit rate) |
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bytestream2_skip(&gb, 2); // skip block align (not needed) |
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bps = bytestream2_get_le16(&gb); |
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avctx->bits_per_coded_sample = bps; |
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if (bps != 16 && bps != 8) { |
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av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample: %d\n", bps); |
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return AVERROR(ENOSYS); |
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} |
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len -= 16; |
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if (len > 0) |
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av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len); |
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return 0; |
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} |
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static const int fixed_coeffs[][3] = { |
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{ 0, 0, 0 }, |
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{ 1, 0, 0 }, |
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{ 2, -1, 0 }, |
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{ 3, -3, 1 } |
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}; |
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static int decode_subframe_lpc(ShortenContext *s, int command, int channel, |
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int residual_size, int32_t coffset) |
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{ |
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int pred_order, sum, qshift, init_sum, i, j; |
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const int *coeffs; |
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if (command == FN_QLPC) { |
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/* read/validate prediction order */ |
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pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE); |
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if (pred_order > s->nwrap) { |
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av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n", |
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pred_order); |
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return AVERROR(EINVAL); |
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} |
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/* read LPC coefficients */ |
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for (i = 0; i < pred_order; i++) |
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s->coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT); |
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coeffs = s->coeffs; |
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qshift = LPCQUANT; |
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} else { |
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/* fixed LPC coeffs */ |
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pred_order = command; |
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if (pred_order >= FF_ARRAY_ELEMS(fixed_coeffs)) { |
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av_log(s->avctx, AV_LOG_ERROR, "invalid pred_order %d\n", |
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pred_order); |
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return AVERROR_INVALIDDATA; |
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} |
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coeffs = fixed_coeffs[pred_order]; |
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qshift = 0; |
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} |
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/* subtract offset from previous samples to use in prediction */ |
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if (command == FN_QLPC && coffset) |
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for (i = -pred_order; i < 0; i++) |
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s->decoded[channel][i] -= coffset; |
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/* decode residual and do LPC prediction */ |
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init_sum = pred_order ? (command == FN_QLPC ? s->lpcqoffset : 0) : coffset; |
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for (i = 0; i < s->blocksize; i++) { |
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sum = init_sum; |
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for (j = 0; j < pred_order; j++) |
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sum += coeffs[j] * s->decoded[channel][i - j - 1]; |
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s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + |
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(sum >> qshift); |
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} |
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/* add offset to current samples */ |
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if (command == FN_QLPC && coffset) |
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for (i = 0; i < s->blocksize; i++) |
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s->decoded[channel][i] += coffset; |
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return 0; |
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} |
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static int read_header(ShortenContext *s) |
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{ |
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int i, ret; |
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int maxnlpc = 0; |
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/* shorten signature */ |
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if (get_bits_long(&s->gb, 32) != AV_RB32("ajkg")) { |
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av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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s->lpcqoffset = 0; |
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s->blocksize = DEFAULT_BLOCK_SIZE; |
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s->nmean = -1; |
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s->version = get_bits(&s->gb, 8); |
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s->internal_ftype = get_uint(s, TYPESIZE); |
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s->channels = get_uint(s, CHANSIZE); |
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if (!s->channels) { |
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av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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if (s->channels > MAX_CHANNELS) { |
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av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels); |
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s->channels = 0; |
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return AVERROR_INVALIDDATA; |
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} |
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s->avctx->channels = s->channels; |
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/* get blocksize if version > 0 */ |
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if (s->version > 0) { |
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int skip_bytes; |
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unsigned blocksize; |
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blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE)); |
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if (!blocksize || blocksize > MAX_BLOCKSIZE) { |
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av_log(s->avctx, AV_LOG_ERROR, |
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"invalid or unsupported block size: %d\n", |
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blocksize); |
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return AVERROR(EINVAL); |
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} |
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s->blocksize = blocksize; |
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maxnlpc = get_uint(s, LPCQSIZE); |
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s->nmean = get_uint(s, 0); |
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skip_bytes = get_uint(s, NSKIPSIZE); |
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for (i = 0; i < skip_bytes; i++) |
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skip_bits(&s->gb, 8); |
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} |
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s->nwrap = FFMAX(NWRAP, maxnlpc); |
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if ((ret = allocate_buffers(s)) < 0) |
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return ret; |
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if ((ret = init_offset(s)) < 0) |
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return ret; |
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if (s->version > 1) |
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s->lpcqoffset = V2LPCQOFFSET; |
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|
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if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) { |
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av_log(s->avctx, AV_LOG_ERROR, |
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"missing verbatim section at beginning of stream\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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s->header_size = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE); |
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if (s->header_size >= OUT_BUFFER_SIZE || |
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s->header_size < CANONICAL_HEADER_SIZE) { |
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av_log(s->avctx, AV_LOG_ERROR, "header is wrong size: %d\n", |
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s->header_size); |
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return AVERROR_INVALIDDATA; |
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} |
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for (i = 0; i < s->header_size; i++) |
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s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE); |
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if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0) |
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return ret; |
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s->cur_chan = 0; |
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s->bitshift = 0; |
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s->got_header = 1; |
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return 0; |
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} |
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static int shorten_decode_frame(AVCodecContext *avctx, void *data, |
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int *got_frame_ptr, AVPacket *avpkt) |
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{ |
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AVFrame *frame = data; |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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ShortenContext *s = avctx->priv_data; |
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int i, input_buf_size = 0; |
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int ret; |
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/* allocate internal bitstream buffer */ |
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if (s->max_framesize == 0) { |
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void *tmp_ptr; |
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s->max_framesize = 8192; // should hopefully be enough for the first header |
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tmp_ptr = av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, |
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s->max_framesize + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!tmp_ptr) { |
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av_log(avctx, AV_LOG_ERROR, "error allocating bitstream buffer\n"); |
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return AVERROR(ENOMEM); |
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} |
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s->bitstream = tmp_ptr; |
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} |
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/* append current packet data to bitstream buffer */ |
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if (1 && s->max_framesize) { //FIXME truncated |
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buf_size = FFMIN(buf_size, s->max_framesize - s->bitstream_size); |
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input_buf_size = buf_size; |
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if (s->bitstream_index + s->bitstream_size + buf_size + FF_INPUT_BUFFER_PADDING_SIZE > |
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s->allocated_bitstream_size) { |
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memmove(s->bitstream, &s->bitstream[s->bitstream_index], |
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s->bitstream_size); |
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s->bitstream_index = 0; |
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} |
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if (buf) |
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memcpy(&s->bitstream[s->bitstream_index + s->bitstream_size], buf, |
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buf_size); |
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buf = &s->bitstream[s->bitstream_index]; |
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buf_size += s->bitstream_size; |
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s->bitstream_size = buf_size; |
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|
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/* do not decode until buffer has at least max_framesize bytes or |
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* the end of the file has been reached */ |
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if (buf_size < s->max_framesize && avpkt->data) { |
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*got_frame_ptr = 0; |
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return input_buf_size; |
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} |
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} |
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/* init and position bitstream reader */ |
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init_get_bits(&s->gb, buf, buf_size * 8); |
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skip_bits(&s->gb, s->bitindex); |
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|
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/* process header or next subblock */ |
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if (!s->got_header) { |
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if ((ret = read_header(s)) < 0) |
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return ret; |
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*got_frame_ptr = 0; |
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goto finish_frame; |
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} |
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|
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/* if quit command was read previously, don't decode anything */ |
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if (s->got_quit_command) { |
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*got_frame_ptr = 0; |
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return avpkt->size; |
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} |
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s->cur_chan = 0; |
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while (s->cur_chan < s->channels) { |
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unsigned cmd; |
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int len; |
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if (get_bits_left(&s->gb) < 3 + FNSIZE) { |
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*got_frame_ptr = 0; |
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break; |
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} |
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cmd = get_ur_golomb_shorten(&s->gb, FNSIZE); |
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if (cmd > FN_VERBATIM) { |
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av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd); |
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*got_frame_ptr = 0; |
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break; |
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} |
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if (!is_audio_command[cmd]) { |
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/* process non-audio command */ |
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switch (cmd) { |
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case FN_VERBATIM: |
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len = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE); |
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while (len--) |
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get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE); |
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break; |
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case FN_BITSHIFT: |
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s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE); |
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break; |
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case FN_BLOCKSIZE: { |
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unsigned blocksize = get_uint(s, av_log2(s->blocksize)); |
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if (blocksize > s->blocksize) { |
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av_log(avctx, AV_LOG_ERROR, |
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"Increasing block size is not supported\n"); |
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return AVERROR_PATCHWELCOME; |
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} |
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if (!blocksize || blocksize > MAX_BLOCKSIZE) { |
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av_log(avctx, AV_LOG_ERROR, "invalid or unsupported " |
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"block size: %d\n", blocksize); |
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return AVERROR(EINVAL); |
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} |
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s->blocksize = blocksize; |
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break; |
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} |
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case FN_QUIT: |
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s->got_quit_command = 1; |
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break; |
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} |
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if (cmd == FN_BLOCKSIZE || cmd == FN_QUIT) { |
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*got_frame_ptr = 0; |
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break; |
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} |
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} else { |
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/* process audio command */ |
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int residual_size = 0; |
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int channel = s->cur_chan; |
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int32_t coffset; |
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|
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/* get Rice code for residual decoding */ |
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if (cmd != FN_ZERO) { |
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residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE); |
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/* This is a hack as version 0 differed in the definition |
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* of get_sr_golomb_shorten(). */ |
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if (s->version == 0) |
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residual_size--; |
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} |
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|
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/* calculate sample offset using means from previous blocks */ |
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if (s->nmean == 0) |
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coffset = s->offset[channel][0]; |
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else { |
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int32_t sum = (s->version < 2) ? 0 : s->nmean / 2; |
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for (i = 0; i < s->nmean; i++) |
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sum += s->offset[channel][i]; |
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coffset = sum / s->nmean; |
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if (s->version >= 2) |
|
coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1; |
|
} |
|
|
|
/* decode samples for this channel */ |
|
if (cmd == FN_ZERO) { |
|
for (i = 0; i < s->blocksize; i++) |
|
s->decoded[channel][i] = 0; |
|
} else { |
|
if ((ret = decode_subframe_lpc(s, cmd, channel, |
|
residual_size, coffset)) < 0) |
|
return ret; |
|
} |
|
|
|
/* update means with info from the current block */ |
|
if (s->nmean > 0) { |
|
int32_t sum = (s->version < 2) ? 0 : s->blocksize / 2; |
|
for (i = 0; i < s->blocksize; i++) |
|
sum += s->decoded[channel][i]; |
|
|
|
for (i = 1; i < s->nmean; i++) |
|
s->offset[channel][i - 1] = s->offset[channel][i]; |
|
|
|
if (s->version < 2) |
|
s->offset[channel][s->nmean - 1] = sum / s->blocksize; |
|
else |
|
s->offset[channel][s->nmean - 1] = (sum / s->blocksize) << s->bitshift; |
|
} |
|
|
|
/* copy wrap samples for use with next block */ |
|
for (i = -s->nwrap; i < 0; i++) |
|
s->decoded[channel][i] = s->decoded[channel][i + s->blocksize]; |
|
|
|
/* shift samples to add in unused zero bits which were removed |
|
* during encoding */ |
|
fix_bitshift(s, s->decoded[channel]); |
|
|
|
/* if this is the last channel in the block, output the samples */ |
|
s->cur_chan++; |
|
if (s->cur_chan == s->channels) { |
|
uint8_t *samples_u8; |
|
int16_t *samples_s16; |
|
int chan; |
|
|
|
/* get output buffer */ |
|
frame->nb_samples = s->blocksize; |
|
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0) |
|
return ret; |
|
|
|
for (chan = 0; chan < s->channels; chan++) { |
|
samples_u8 = ((uint8_t **)frame->extended_data)[chan]; |
|
samples_s16 = ((int16_t **)frame->extended_data)[chan]; |
|
for (i = 0; i < s->blocksize; i++) { |
|
switch (s->internal_ftype) { |
|
case TYPE_U8: |
|
*samples_u8++ = av_clip_uint8(s->decoded[chan][i]); |
|
break; |
|
case TYPE_S16HL: |
|
case TYPE_S16LH: |
|
*samples_s16++ = av_clip_int16(s->decoded[chan][i]); |
|
break; |
|
} |
|
} |
|
} |
|
|
|
*got_frame_ptr = 1; |
|
} |
|
} |
|
} |
|
if (s->cur_chan < s->channels) |
|
*got_frame_ptr = 0; |
|
|
|
finish_frame: |
|
s->bitindex = get_bits_count(&s->gb) - 8 * (get_bits_count(&s->gb) / 8); |
|
i = get_bits_count(&s->gb) / 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 AVERROR_INVALIDDATA; |
|
} |
|
if (s->bitstream_size) { |
|
s->bitstream_index += i; |
|
s->bitstream_size -= i; |
|
return input_buf_size; |
|
} else |
|
return i; |
|
} |
|
|
|
static av_cold int shorten_decode_close(AVCodecContext *avctx) |
|
{ |
|
ShortenContext *s = avctx->priv_data; |
|
int i; |
|
|
|
for (i = 0; i < s->channels; i++) { |
|
s->decoded[i] = NULL; |
|
av_freep(&s->decoded_base[i]); |
|
av_freep(&s->offset[i]); |
|
} |
|
av_freep(&s->bitstream); |
|
av_freep(&s->coeffs); |
|
|
|
return 0; |
|
} |
|
|
|
AVCodec ff_shorten_decoder = { |
|
.name = "shorten", |
|
.long_name = NULL_IF_CONFIG_SMALL("Shorten"), |
|
.type = AVMEDIA_TYPE_AUDIO, |
|
.id = AV_CODEC_ID_SHORTEN, |
|
.priv_data_size = sizeof(ShortenContext), |
|
.init = shorten_decode_init, |
|
.close = shorten_decode_close, |
|
.decode = shorten_decode_frame, |
|
.capabilities = CODEC_CAP_DELAY | CODEC_CAP_DR1, |
|
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P, |
|
AV_SAMPLE_FMT_U8P, |
|
AV_SAMPLE_FMT_NONE }, |
|
};
|
|
|