static int read_header(ShortenContext *s) { int i, ret; int maxnlpc = 0; /* shorten signature */ if (get_bits_long(&s->gb, 32) != AV_RB32("ajkg")) { av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n"); s->lpcqoffset = 0; s->blocksize = DEFAULT_BLOCK_SIZE; 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) { av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n"); if (s->channels > MAX_CHANNELS) { av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels); s->channels = 0; s->avctx->channels = s->channels; /* get blocksize if version > 0 */ if (s->version > 0) { int skip_bytes; unsigned blocksize; blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE)); if (!blocksize || blocksize > MAX_BLOCKSIZE) { av_log(s->avctx, AV_LOG_ERROR, "invalid or unsupported block size: %d\n", blocksize); return AVERROR(EINVAL); s->blocksize = blocksize; maxnlpc = get_uint(s, LPCQSIZE); s->nmean = get_uint(s, 0); skip_bytes = get_uint(s, NSKIPSIZE); if ((unsigned)skip_bytes > get_bits_left(&s->gb)/8) { av_log(s->avctx, AV_LOG_ERROR, "invalid skip_bytes: %d\n", skip_bytes); for (i = 0; i < skip_bytes; i++) skip_bits(&s->gb, 8); s->nwrap = FFMAX(NWRAP, maxnlpc); if ((ret = allocate_buffers(s)) < 0) return ret; if ((ret = init_offset(s)) < 0) return ret; if (s->version > 1) s->lpcqoffset = V2LPCQOFFSET; if (s->avctx->extradata_size > 0) goto end; if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) { av_log(s->avctx, AV_LOG_ERROR, "missing verbatim section at beginning of stream\n"); 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); for (i = 0; i < s->header_size; i++) s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE); if (AV_RL32(s->header) == MKTAG('R','I','F','F')) { if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0) return ret; } else if (AV_RL32(s->header) == MKTAG('F','O','R','M')) { if ((ret = decode_aiff_header(s->avctx, s->header, s->header_size)) < 0) return ret; } else { avpriv_report_missing_feature(s->avctx, "unsupported bit packing %" PRIX32, AV_RL32(s->header)); return AVERROR_PATCHWELCOME; end: s->cur_chan = 0; s->bitshift = 0; s->got_header = 1; return 0;
static int read_header(ShortenContext *s) { int i, ret; int maxnlpc = 0;   if (get_bits_long(&s->gb, 32) != AV_RB32("ajkg")) { av_log(s->avctx, AV_LOG_ERROR, "missing shorten magic 'ajkg'\n"); s->lpcqoffset = 0; s->blocksize = DEFAULT_BLOCK_SIZE; 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) { av_log(s->avctx, AV_LOG_ERROR, "No channels reported\n"); if (s->channels > MAX_CHANNELS) { av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels); s->channels = 0; s->avctx->channels = s->channels;   if (s->version > 0) { int skip_bytes; unsigned blocksize; blocksize = get_uint(s, av_log2(DEFAULT_BLOCK_SIZE)); if (!blocksize || blocksize > MAX_BLOCKSIZE) { av_log(s->avctx, AV_LOG_ERROR, "invalid or unsupported block size: %d\n", blocksize); return AVERROR(EINVAL); s->blocksize = blocksize; maxnlpc = get_uint(s, LPCQSIZE); s->nmean = get_uint(s, 0); skip_bytes = get_uint(s, NSKIPSIZE); if ((unsigned)skip_bytes > get_bits_left(&s->gb)/8) { av_log(s->avctx, AV_LOG_ERROR, "invalid skip_bytes: %d\n", skip_bytes); for (i = 0; i < skip_bytes; i++) skip_bits(&s->gb, 8); s->nwrap = FFMAX(NWRAP, maxnlpc); if ((ret = allocate_buffers(s)) < 0) return ret; if ((ret = init_offset(s)) < 0) return ret; if (s->version > 1) s->lpcqoffset = V2LPCQOFFSET; if (s->avctx->extradata_size > 0) goto end; if (get_ur_golomb_shorten(&s->gb, FNSIZE) != FN_VERBATIM) { av_log(s->avctx, AV_LOG_ERROR, "missing verbatim section at beginning of stream\n"); 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); for (i = 0; i < s->header_size; i++) s->header[i] = (char)get_ur_golomb_shorten(&s->gb, VERBATIM_BYTE_SIZE); if (AV_RL32(s->header) == MKTAG('R','I','F','F')) { if ((ret = decode_wave_header(s->avctx, s->header, s->header_size)) < 0) return ret; } else if (AV_RL32(s->header) == MKTAG('F','O','R','M')) { if ((ret = decode_aiff_header(s->avctx, s->header, s->header_size)) < 0) return ret; } else { avpriv_report_missing_feature(s->avctx, "unsupported bit packing %" PRIX32, AV_RL32(s->header)); return AVERROR_PATCHWELCOME; end: s->cur_chan = 0; s->bitshift = 0; s->got_header = 1; return 0;