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Diffstat (limited to 'src/libffmpeg/libavcodec/shorten.c')
-rw-r--r--src/libffmpeg/libavcodec/shorten.c533
1 files changed, 0 insertions, 533 deletions
diff --git a/src/libffmpeg/libavcodec/shorten.c b/src/libffmpeg/libavcodec/shorten.c
deleted file mode 100644
index 358ecf23f..000000000
--- a/src/libffmpeg/libavcodec/shorten.c
+++ /dev/null
@@ -1,533 +0,0 @@
-/*
- * Shorten decoder
- * Copyright (c) 2005 Jeff Muizelaar
- *
- * 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 shorten.c
- * Shorten decoder
- * @author Jeff Muizelaar
- *
- */
-
-#define DEBUG
-#include <limits.h>
-#include "avcodec.h"
-#include "bitstream.h"
-#include "golomb.h"
-
-#define MAX_CHANNELS 8
-#define MAX_BLOCKSIZE 65535
-
-#define OUT_BUFFER_SIZE 16384
-
-#define ULONGSIZE 2
-
-#define WAVE_FORMAT_PCM 0x0001
-
-#define DEFAULT_BLOCK_SIZE 256
-
-#define TYPESIZE 4
-#define CHANSIZE 0
-#define LPCQSIZE 2
-#define ENERGYSIZE 3
-#define BITSHIFTSIZE 2
-
-#define TYPE_S16HL 3
-#define TYPE_S16LH 5
-
-#define NWRAP 3
-#define NSKIPSIZE 1
-
-#define LPCQUANT 5
-#define V2LPCQOFFSET (1 << LPCQUANT)
-
-#define FNSIZE 2
-#define FN_DIFF0 0
-#define FN_DIFF1 1
-#define FN_DIFF2 2
-#define FN_DIFF3 3
-#define FN_QUIT 4
-#define FN_BLOCKSIZE 5
-#define FN_BITSHIFT 6
-#define FN_QLPC 7
-#define FN_ZERO 8
-#define FN_VERBATIM 9
-
-#define VERBATIM_CKSIZE_SIZE 5
-#define VERBATIM_BYTE_SIZE 8
-#define CANONICAL_HEADER_SIZE 44
-
-typedef struct ShortenContext {
- AVCodecContext *avctx;
- GetBitContext gb;
-
- int min_framesize, max_framesize;
- int channels;
-
- int32_t *decoded[MAX_CHANNELS];
- int32_t *offset[MAX_CHANNELS];
- uint8_t *bitstream;
- int bitstream_size;
- int bitstream_index;
- unsigned int allocated_bitstream_size;
- int header_size;
- uint8_t header[OUT_BUFFER_SIZE];
- int version;
- int cur_chan;
- int bitshift;
- int nmean;
- int internal_ftype;
- int nwrap;
- int blocksize;
- int bitindex;
- int32_t lpcqoffset;
-} ShortenContext;
-
-static int shorten_decode_init(AVCodecContext * avctx)
-{
- ShortenContext *s = avctx->priv_data;
- s->avctx = avctx;
-
- return 0;
-}
-
-static int allocate_buffers(ShortenContext *s)
-{
- int i, chan;
- for (chan=0; chan<s->channels; chan++) {
- if(FFMAX(1, s->nmean) >= UINT_MAX/sizeof(int32_t)){
- av_log(s->avctx, AV_LOG_ERROR, "nmean too large\n");
- return -1;
- }
- if(s->blocksize + s->nwrap >= UINT_MAX/sizeof(int32_t) || s->blocksize + s->nwrap <= (unsigned)s->nwrap){
- av_log(s->avctx, AV_LOG_ERROR, "s->blocksize + s->nwrap too large\n");
- return -1;
- }
-
- s->offset[chan] = av_realloc(s->offset[chan], sizeof(int32_t)*FFMAX(1, s->nmean));
-
- s->decoded[chan] = av_realloc(s->decoded[chan], sizeof(int32_t)*(s->blocksize + s->nwrap));
- for (i=0; i<s->nwrap; i++)
- s->decoded[chan][i] = 0;
- s->decoded[chan] += s->nwrap;
- }
- return 0;
-}
-
-
-static inline unsigned int get_uint(ShortenContext *s, int k)
-{
- if (s->version != 0)
- k = get_ur_golomb_shorten(&s->gb, ULONGSIZE);
- return get_ur_golomb_shorten(&s->gb, k);
-}
-
-
-static void fix_bitshift(ShortenContext *s, int32_t *buffer)
-{
- int i;
-
- if (s->bitshift != 0)
- for (i = 0; i < s->blocksize; i++)
- buffer[s->nwrap + i] <<= s->bitshift;
-}
-
-
-static void init_offset(ShortenContext *s)
-{
- int32_t mean = 0;
- int chan, i;
- int nblock = FFMAX(1, s->nmean);
- /* initialise offset */
- switch (s->internal_ftype)
- {
- case TYPE_S16HL:
- case TYPE_S16LH:
- mean = 0;
- break;
- default:
- av_log(s->avctx, AV_LOG_ERROR, "unknown audio type");
- abort();
- }
-
- for (chan = 0; chan < s->channels; chan++)
- for (i = 0; i < nblock; i++)
- s->offset[chan][i] = mean;
-}
-
-static int inline get_le32(GetBitContext *gb)
-{
- return bswap_32(get_bits_long(gb, 32));
-}
-
-static short inline get_le16(GetBitContext *gb)
-{
- return bswap_16(get_bits_long(gb, 16));
-}
-
-static int decode_wave_header(AVCodecContext *avctx, uint8_t *header, int header_size)
-{
- GetBitContext hb;
- int len;
- int chunk_size;
- short wave_format;
-
- init_get_bits(&hb, header, header_size*8);
- if (get_le32(&hb) != MKTAG('R','I','F','F')) {
- av_log(avctx, AV_LOG_ERROR, "missing RIFF tag\n");
- return -1;
- }
-
- chunk_size = get_le32(&hb);
-
- if (get_le32(&hb) != MKTAG('W','A','V','E')) {
- av_log(avctx, AV_LOG_ERROR, "missing WAVE tag\n");
- return -1;
- }
-
- while (get_le32(&hb) != MKTAG('f','m','t',' ')) {
- len = get_le32(&hb);
- skip_bits(&hb, 8*len);
- }
- len = get_le32(&hb);
-
- if (len < 16) {
- av_log(avctx, AV_LOG_ERROR, "fmt chunk was too short\n");
- return -1;
- }
-
- wave_format = get_le16(&hb);
-
- switch (wave_format) {
- case WAVE_FORMAT_PCM:
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "unsupported wave format\n");
- return -1;
- }
-
- avctx->channels = get_le16(&hb);
- avctx->sample_rate = get_le32(&hb);
- avctx->bit_rate = get_le32(&hb) * 8;
- avctx->block_align = get_le16(&hb);
- avctx->bits_per_sample = get_le16(&hb);
-
- if (avctx->bits_per_sample != 16) {
- av_log(avctx, AV_LOG_ERROR, "unsupported number of bits per sample\n");
- return -1;
- }
-
- len -= 16;
- if (len > 0)
- av_log(avctx, AV_LOG_INFO, "%d header bytes unparsed\n", len);
-
- return 0;
-}
-
-static int16_t * interleave_buffer(int16_t *samples, int nchan, int blocksize, int32_t **buffer) {
- int i, chan;
- for (i=0; i<blocksize; i++)
- for (chan=0; chan < nchan; chan++)
- *samples++ = FFMIN(buffer[chan][i], 32768);
- return samples;
-}
-
-static void decode_subframe_lpc(ShortenContext *s, int channel, int residual_size, int pred_order)
-{
- int sum, i, j;
- int coeffs[pred_order];
-
- for (i=0; i<pred_order; i++)
- coeffs[i] = get_sr_golomb_shorten(&s->gb, LPCQUANT);
-
- for (i=0; i < s->blocksize; i++) {
- sum = s->lpcqoffset;
- for (j=0; j<pred_order; j++)
- sum += coeffs[j] * s->decoded[channel][i-j-1];
- s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + (sum >> LPCQUANT);
- }
-}
-
-
-static int shorten_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
-{
- ShortenContext *s = avctx->priv_data;
- int i, input_buf_size = 0;
- int16_t *samples = data;
- if(s->max_framesize == 0){
- s->max_framesize= 1024; // 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
- buf_size= FFMIN(buf_size, s->max_framesize - s->bitstream_size);
- input_buf_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){
- //dprintf("wanna more data ... %d\n", buf_size);
- return input_buf_size;
- }
- }
- init_get_bits(&s->gb, buf, buf_size*8);
- get_bits(&s->gb, s->bitindex);
- if (!s->blocksize)
- {
- int maxnlpc = 0;
- /* shorten signature */
- if (get_bits_long(&s->gb, 32) != bswap_32(ff_get_fourcc("ajkg"))) {
- av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n");
- return -1;
- }
-
- s->lpcqoffset = 0;
- s->blocksize = DEFAULT_BLOCK_SIZE;
- s->channels = 1;
- s->nmean = -1;
- s->version = get_bits(&s->gb, 8);
- s->internal_ftype = get_uint(s, TYPESIZE);
-
- s->channels = get_uint(s, CHANSIZE);
- if (s->channels > MAX_CHANNELS) {
- av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
- return -1;
- }
-
- /* get blocksize if version > 0 */
- if (s->version > 0) {
- int skip_bytes;
- s->blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE));
- maxnlpc = get_uint(s, LPCQSIZE);
- s->nmean = get_uint(s, 0);
-
- skip_bytes = get_uint(s, NSKIPSIZE);
- for (i=0; i<skip_bytes; i++) {
- skip_bits(&s->gb, 8);
- }
- }
- s->nwrap = FFMAX(NWRAP, maxnlpc);
-
- if (allocate_buffers(s))
- return -1;
-
- init_offset(s);
-
- if (s->version > 1)
- s->lpcqoffset = V2LPCQOFFSET;
-
- if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) {
- av_log(s->avctx, AV_LOG_ERROR, "missing verbatim section at begining of stream\n");
- return -1;
- }
-
- s->header_size = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
- if (s->header_size >= OUT_BUFFER_SIZE || s->header_size < CANONICAL_HEADER_SIZE) {
- av_log(s->avctx, AV_LOG_ERROR, "header is wrong size: %d\n", s->header_size);
- return -1;
- }
-
- for (i=0; i<s->header_size; i++)
- s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
-
- if (decode_wave_header(avctx, s->header, s->header_size) < 0)
- return -1;
-
- s->cur_chan = 0;
- s->bitshift = 0;
- }
- else
- {
- int cmd;
- int len;
- cmd = get_ur_golomb_shorten(&s->gb, FNSIZE);
- switch (cmd) {
- case FN_ZERO:
- case FN_DIFF0:
- case FN_DIFF1:
- case FN_DIFF2:
- case FN_DIFF3:
- case FN_QLPC:
- {
- int residual_size = 0;
- int channel = s->cur_chan;
- int32_t coffset;
- if (cmd != FN_ZERO) {
- residual_size = get_ur_golomb_shorten(&s->gb, ENERGYSIZE);
- /* this is a hack as version 0 differed in defintion of get_sr_golomb_shorten */
- if (s->version == 0)
- residual_size--;
- }
-
- if (s->nmean == 0)
- coffset = s->offset[channel][0];
- else {
- int32_t sum = (s->version < 2) ? 0 : s->nmean / 2;
- for (i=0; i<s->nmean; i++)
- sum += s->offset[channel][i];
- coffset = sum / s->nmean;
- if (s->version >= 2)
- coffset >>= FFMIN(1, s->bitshift);
- }
- switch (cmd) {
- case FN_ZERO:
- for (i=0; i<s->blocksize; i++)
- s->decoded[channel][i] = 0;
- break;
- case FN_DIFF0:
- for (i=0; i<s->blocksize; i++)
- s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + coffset;
- break;
- case FN_DIFF1:
- for (i=0; i<s->blocksize; i++)
- s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + s->decoded[channel][i - 1];
- break;
- case FN_DIFF2:
- for (i=0; i<s->blocksize; i++)
- s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + 2*s->decoded[channel][i-1]
- - s->decoded[channel][i-2];
- break;
- case FN_DIFF3:
- for (i=0; i<s->blocksize; i++)
- s->decoded[channel][i] = get_sr_golomb_shorten(&s->gb, residual_size) + 3*s->decoded[channel][i-1]
- - 3*s->decoded[channel][i-2]
- + s->decoded[channel][i-3];
- break;
- case FN_QLPC:
- {
- int pred_order = get_ur_golomb_shorten(&s->gb, LPCQSIZE);
- for (i=0; i<pred_order; i++)
- s->decoded[channel][i - pred_order] -= coffset;
- decode_subframe_lpc(s, channel, residual_size, pred_order);
- if (coffset != 0)
- for (i=0; i < s->blocksize; i++)
- s->decoded[channel][i] += coffset;
- }
- }
- 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;
- }
- for (i=-s->nwrap; i<0; i++)
- s->decoded[channel][i] = s->decoded[channel][i + s->blocksize];
-
- fix_bitshift(s, s->decoded[channel]);
-
- s->cur_chan++;
- if (s->cur_chan == s->channels) {
- samples = interleave_buffer(samples, s->channels, s->blocksize, s->decoded);
- s->cur_chan = 0;
- goto frame_done;
- }
- break;
- }
- break;
- case FN_VERBATIM:
- len = get_ur_golomb_shorten(&s->gb, VERBATIM_CKSIZE_SIZE);
- while (len--) {
- get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE);
- }
- break;
- case FN_BITSHIFT:
- s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
- break;
- case FN_BLOCKSIZE:
- s->blocksize = get_uint(s, av_log2(s->blocksize));
- break;
- case FN_QUIT:
- return buf_size;
- break;
- default:
- av_log(avctx, AV_LOG_ERROR, "unknown shorten function %d\n", cmd);
- return -1;
- break;
- }
- }
-frame_done:
- *data_size = (int8_t *)samples - (int8_t *)data;
-
- // s->last_blocksize = s->blocksize;
- 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 -1;
- }
- if (s->bitstream_size) {
- s->bitstream_index += i;
- s->bitstream_size -= i;
- return input_buf_size;
- } else
- return i;
-}
-
-static int shorten_decode_close(AVCodecContext *avctx)
-{
- ShortenContext *s = avctx->priv_data;
- int i;
-
- for (i = 0; i < s->channels; i++) {
- s->decoded[i] -= s->nwrap;
- av_freep(&s->decoded[i]);
- av_freep(&s->offset[i]);
- }
- av_freep(&s->bitstream);
- return 0;
-}
-
-static void shorten_flush(AVCodecContext *avctx){
- ShortenContext *s = avctx->priv_data;
-
- s->bitstream_size=
- s->bitstream_index= 0;
-}
-
-AVCodec shorten_decoder = {
- "shorten",
- CODEC_TYPE_AUDIO,
- CODEC_ID_SHORTEN,
- sizeof(ShortenContext),
- shorten_decode_init,
- NULL,
- shorten_decode_close,
- shorten_decode_frame,
- .flush= shorten_flush,
-};
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 13:58:59 +0000