X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fmlpdec.c;h=8060ebe197db5146c9e2d330d145d43d2f1feee8;hb=f9310cbb2fcfcd9e41cafb3789c3b7ae3b90dbf4;hp=905fb0bdaeefaf167202d927cc71687be0faf859;hpb=8e9ee714fcf764278d84c3b2ca877cffbd730147;p=ffmpeg diff --git a/libavcodec/mlpdec.c b/libavcodec/mlpdec.c index 905fb0bdaee..8060ebe197d 100644 --- a/libavcodec/mlpdec.c +++ b/libavcodec/mlpdec.c @@ -27,8 +27,9 @@ #include #include "avcodec.h" +#include "dsputil.h" #include "libavutil/intreadwrite.h" -#include "bitstream.h" +#include "get_bits.h" #include "libavutil/crc.h" #include "parser.h" #include "mlp_parser.h" @@ -93,7 +94,7 @@ typedef struct SubStream { //! Whether the LSBs of the matrix output are encoded in the bitstream. uint8_t lsb_bypass[MAX_MATRICES]; //! Matrix coefficients, stored as 2.14 fixed point. - int32_t matrix_coeff[MAX_MATRICES][MAX_CHANNELS+2]; + int32_t matrix_coeff[MAX_MATRICES][MAX_CHANNELS]; //! Left shift to apply to noise values in 0x31eb substreams. uint8_t matrix_noise_shift[MAX_MATRICES]; //@} @@ -117,6 +118,9 @@ typedef struct SubStream { typedef struct MLPDecodeContext { AVCodecContext *avctx; + //! Current access unit being read has a major sync. + int is_major_sync_unit; + //! Set if a valid major sync block has been read. Otherwise no decoding is possible. uint8_t params_valid; @@ -135,9 +139,14 @@ typedef struct MLPDecodeContext { ChannelParams channel_params[MAX_CHANNELS]; + int matrix_changed; + int filter_changed[MAX_CHANNELS][NUM_FILTERS]; + int8_t noise_buffer[MAX_BLOCKSIZE_POW2]; int8_t bypassed_lsbs[MAX_BLOCKSIZE][MAX_CHANNELS]; - int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS+2]; + int32_t sample_buffer[MAX_BLOCKSIZE][MAX_CHANNELS]; + + DSPContext dsp; } MLPDecodeContext; static VLC huff_vlc[3]; @@ -146,15 +155,17 @@ static VLC huff_vlc[3]; static av_cold void init_static(void) { - INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18, - &ff_mlp_huffman_tables[0][0][1], 2, 1, - &ff_mlp_huffman_tables[0][0][0], 2, 1, 512); - INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16, - &ff_mlp_huffman_tables[1][0][1], 2, 1, - &ff_mlp_huffman_tables[1][0][0], 2, 1, 512); - INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15, - &ff_mlp_huffman_tables[2][0][1], 2, 1, - &ff_mlp_huffman_tables[2][0][0], 2, 1, 512); + if (!huff_vlc[0].bits) { + INIT_VLC_STATIC(&huff_vlc[0], VLC_BITS, 18, + &ff_mlp_huffman_tables[0][0][1], 2, 1, + &ff_mlp_huffman_tables[0][0][0], 2, 1, 512); + INIT_VLC_STATIC(&huff_vlc[1], VLC_BITS, 16, + &ff_mlp_huffman_tables[1][0][1], 2, 1, + &ff_mlp_huffman_tables[1][0][0], 2, 1, 512); + INIT_VLC_STATIC(&huff_vlc[2], VLC_BITS, 15, + &ff_mlp_huffman_tables[2][0][1], 2, 1, + &ff_mlp_huffman_tables[2][0][0], 2, 1, 512); + } ff_mlp_init_crc(); } @@ -225,6 +236,7 @@ static av_cold int mlp_decode_init(AVCodecContext *avctx) m->avctx = avctx; for (substr = 0; substr < MAX_SUBSTREAMS; substr++) m->substream[substr].lossless_check_data = 0xffffffff; + dsputil_init(&m->dsp, avctx); return 0; } @@ -329,6 +341,9 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, uint8_t checksum; uint8_t lossless_check; int start_count = get_bits_count(gbp); + const int max_matrix_channel = m->avctx->codec_id == CODEC_ID_MLP + ? MAX_MATRIX_CHANNEL_MLP + : MAX_MATRIX_CHANNEL_TRUEHD; sync_word = get_bits(gbp, 13); @@ -337,14 +352,42 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, "restart header sync incorrect (got 0x%04x)\n", sync_word); return -1; } + s->noise_type = get_bits1(gbp); + if (m->avctx->codec_id == CODEC_ID_MLP && s->noise_type) { + av_log(m->avctx, AV_LOG_ERROR, "MLP must have 0x31ea sync word.\n"); + return -1; + } + skip_bits(gbp, 16); /* Output timestamp */ s->min_channel = get_bits(gbp, 4); s->max_channel = get_bits(gbp, 4); s->max_matrix_channel = get_bits(gbp, 4); + if (s->max_matrix_channel > max_matrix_channel) { + av_log(m->avctx, AV_LOG_ERROR, + "Max matrix channel cannot be greater than %d.\n", + max_matrix_channel); + return -1; + } + + if (s->max_channel != s->max_matrix_channel) { + av_log(m->avctx, AV_LOG_ERROR, + "Max channel must be equal max matrix channel.\n"); + return -1; + } + + /* This should happen for TrueHD streams with >6 channels and MLP's noise + * type. It is not yet known if this is allowed. */ + if (s->max_channel > MAX_MATRIX_CHANNEL_MLP && !s->noise_type) { + av_log(m->avctx, AV_LOG_ERROR, + "Number of channels %d is larger than the maximum supported " + "by the decoder. %s\n", s->max_channel+2, sample_message); + return -1; + } + if (s->min_channel > s->max_channel) { av_log(m->avctx, AV_LOG_ERROR, "Substream min channel cannot be greater than max channel.\n"); @@ -375,9 +418,6 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, av_log(m->avctx, AV_LOG_WARNING, "Lossless check failed - expected %02x, calculated %02x.\n", lossless_check, tmp); - else - dprintf(m->avctx, "Lossless check passed for substream %d (%x).\n", - substr, tmp); } skip_bits(gbp, 16); @@ -386,8 +426,6 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, for (ch = 0; ch <= s->max_matrix_channel; ch++) { int ch_assign = get_bits(gbp, 6); - dprintf(m->avctx, "ch_assign[%d][%d] = %d\n", substr, ch, - ch_assign); if (ch_assign > s->max_matrix_channel) { av_log(m->avctx, AV_LOG_ERROR, "Assignment of matrix channel %d to invalid output channel %d. %s\n", @@ -425,9 +463,8 @@ static int read_restart_header(MLPDecodeContext *m, GetBitContext *gbp, cp->huff_lsbs = 24; } - if (substr == m->max_decoded_substream) { + if (substr == m->max_decoded_substream) m->avctx->channels = s->max_matrix_channel + 1; - } return 0; } @@ -438,22 +475,29 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, unsigned int channel, unsigned int filter) { FilterParams *fp = &m->channel_params[channel].filter_params[filter]; + const int max_order = filter ? MAX_IIR_ORDER : MAX_FIR_ORDER; const char fchar = filter ? 'I' : 'F'; int i, order; // Filter is 0 for FIR, 1 for IIR. assert(filter < 2); + if (m->filter_changed[channel][filter]++ > 1) { + av_log(m->avctx, AV_LOG_ERROR, "Filters may change only once per access unit.\n"); + return -1; + } + order = get_bits(gbp, 4); - if (order > MAX_FILTER_ORDER) { + if (order > max_order) { av_log(m->avctx, AV_LOG_ERROR, "%cIR filter order %d is greater than maximum %d.\n", - fchar, order, MAX_FILTER_ORDER); + fchar, order, max_order); return -1; } fp->order = order; if (order > 0) { + int32_t *fcoeff = m->channel_params[channel].coeff[filter]; int coeff_bits, coeff_shift; fp->shift = get_bits(gbp, 4); @@ -474,7 +518,7 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, } for (i = 0; i < order; i++) - fp->coeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift; + fcoeff[i] = get_sbits(gbp, coeff_bits) << coeff_shift; if (get_bits1(gbp)) { int state_bits, state_shift; @@ -500,19 +544,35 @@ static int read_filter_params(MLPDecodeContext *m, GetBitContext *gbp, /** Read parameters for primitive matrices. */ -static int read_matrix_params(MLPDecodeContext *m, SubStream *s, GetBitContext *gbp) +static int read_matrix_params(MLPDecodeContext *m, unsigned int substr, GetBitContext *gbp) { + SubStream *s = &m->substream[substr]; unsigned int mat, ch; + const int max_primitive_matrices = m->avctx->codec_id == CODEC_ID_MLP + ? MAX_MATRICES_MLP + : MAX_MATRICES_TRUEHD; + + if (m->matrix_changed++ > 1) { + av_log(m->avctx, AV_LOG_ERROR, "Matrices may change only once per access unit.\n"); + return -1; + } s->num_primitive_matrices = get_bits(gbp, 4); + if (s->num_primitive_matrices > max_primitive_matrices) { + av_log(m->avctx, AV_LOG_ERROR, + "Number of primitive matrices cannot be greater than %d.\n", + max_primitive_matrices); + return -1; + } + for (mat = 0; mat < s->num_primitive_matrices; mat++) { int frac_bits, max_chan; s->matrix_out_ch[mat] = get_bits(gbp, 4); frac_bits = get_bits(gbp, 4); s->lsb_bypass [mat] = get_bits1(gbp); - if (s->matrix_out_ch[mat] > s->max_channel) { + if (s->matrix_out_ch[mat] > s->max_matrix_channel) { av_log(m->avctx, AV_LOG_ERROR, "Invalid channel %d specified as output from matrix.\n", s->matrix_out_ch[mat]); @@ -565,6 +625,11 @@ static int read_channel_params(MLPDecodeContext *m, unsigned int substr, if (read_filter_params(m, gbp, ch, IIR) < 0) return -1; + if (fir->order + iir->order > 8) { + av_log(m->avctx, AV_LOG_ERROR, "Total filter orders too high.\n"); + return -1; + } + if (fir->order && iir->order && fir->shift != iir->shift) { av_log(m->avctx, AV_LOG_ERROR, @@ -572,10 +637,10 @@ static int read_channel_params(MLPDecodeContext *m, unsigned int substr, return -1; } /* The FIR and IIR filters must have the same precision. - * To simplify the filtering code, only the precision of the - * FIR filter is considered. If only the IIR filter is employed, - * the FIR filter precision is set to that of the IIR filter, so - * that the filtering code can use it. */ + * To simplify the filtering code, only the precision of the + * FIR filter is considered. If only the IIR filter is employed, + * the FIR filter precision is set to that of the IIR filter, so + * that the filtering code can use it. */ if (!fir->order && iir->order) fir->shift = iir->shift; @@ -586,9 +651,12 @@ static int read_channel_params(MLPDecodeContext *m, unsigned int substr, cp->codebook = get_bits(gbp, 2); cp->huff_lsbs = get_bits(gbp, 5); - cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); + if (cp->huff_lsbs > 24) { + av_log(m->avctx, AV_LOG_ERROR, "Invalid huff_lsbs.\n"); + return -1; + } - /* TODO: validate */ + cp->sign_huff_offset = calculate_sign_huff(m, substr, ch); return 0; } @@ -603,32 +671,28 @@ static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp, unsigned int ch; if (s->param_presence_flags & PARAM_PRESENCE) - if (get_bits1(gbp)) - s->param_presence_flags = get_bits(gbp, 8); + if (get_bits1(gbp)) + s->param_presence_flags = get_bits(gbp, 8); if (s->param_presence_flags & PARAM_BLOCKSIZE) if (get_bits1(gbp)) { s->blocksize = get_bits(gbp, 9); - if (s->blocksize > MAX_BLOCKSIZE) { - av_log(m->avctx, AV_LOG_ERROR, "block size too large\n"); + if (s->blocksize < 8 || s->blocksize > m->access_unit_size) { + av_log(m->avctx, AV_LOG_ERROR, "Invalid blocksize."); s->blocksize = 0; return -1; } } if (s->param_presence_flags & PARAM_MATRIX) - if (get_bits1(gbp)) { - if (read_matrix_params(m, s, gbp) < 0) + if (get_bits1(gbp)) + if (read_matrix_params(m, substr, gbp) < 0) return -1; - } if (s->param_presence_flags & PARAM_OUTSHIFT) if (get_bits1(gbp)) - for (ch = 0; ch <= s->max_matrix_channel; ch++) { + for (ch = 0; ch <= s->max_matrix_channel; ch++) s->output_shift[ch] = get_sbits(gbp, 4); - dprintf(m->avctx, "output shift[%d] = %d\n", - ch, s->output_shift[ch]); - } if (s->param_presence_flags & PARAM_QUANTSTEP) if (get_bits1(gbp)) @@ -641,10 +705,9 @@ static int read_decoding_params(MLPDecodeContext *m, GetBitContext *gbp, } for (ch = s->min_channel; ch <= s->max_channel; ch++) - if (get_bits1(gbp)) { + if (get_bits1(gbp)) if (read_channel_params(m, substr, gbp, ch) < 0) return -1; - } return 0; } @@ -658,47 +721,25 @@ static void filter_channel(MLPDecodeContext *m, unsigned int substr, unsigned int channel) { SubStream *s = &m->substream[substr]; - int32_t filter_state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FILTER_ORDER]; - FilterParams *fp[NUM_FILTERS] = { &m->channel_params[channel].filter_params[FIR], - &m->channel_params[channel].filter_params[IIR], }; - unsigned int filter_shift = fp[FIR]->shift; + const int32_t *fircoeff = m->channel_params[channel].coeff[FIR]; + int32_t state_buffer[NUM_FILTERS][MAX_BLOCKSIZE + MAX_FIR_ORDER]; + int32_t *firbuf = state_buffer[FIR] + MAX_BLOCKSIZE; + int32_t *iirbuf = state_buffer[IIR] + MAX_BLOCKSIZE; + FilterParams *fir = &m->channel_params[channel].filter_params[FIR]; + FilterParams *iir = &m->channel_params[channel].filter_params[IIR]; + unsigned int filter_shift = fir->shift; int32_t mask = MSB_MASK(s->quant_step_size[channel]); - int index = MAX_BLOCKSIZE; - int j, i; - for (j = 0; j < NUM_FILTERS; j++) { - memcpy(&filter_state_buffer[j][MAX_BLOCKSIZE], &fp[j]->state[0], - MAX_FILTER_ORDER * sizeof(int32_t)); - } - - for (i = 0; i < s->blocksize; i++) { - int32_t residual = m->sample_buffer[i + s->blockpos][channel]; - unsigned int order; - int64_t accum = 0; - int32_t result; - - /* TODO: Move this code to DSPContext? */ - - for (j = 0; j < NUM_FILTERS; j++) - for (order = 0; order < fp[j]->order; order++) - accum += (int64_t)filter_state_buffer[j][index + order] * - fp[j]->coeff[order]; - - accum = accum >> filter_shift; - result = (accum + residual) & mask; - - --index; + memcpy(firbuf, fir->state, MAX_FIR_ORDER * sizeof(int32_t)); + memcpy(iirbuf, iir->state, MAX_IIR_ORDER * sizeof(int32_t)); - filter_state_buffer[FIR][index] = result; - filter_state_buffer[IIR][index] = result - accum; + m->dsp.mlp_filter_channel(firbuf, fircoeff, + fir->order, iir->order, + filter_shift, mask, s->blocksize, + &m->sample_buffer[s->blockpos][channel]); - m->sample_buffer[i + s->blockpos][channel] = result; - } - - for (j = 0; j < NUM_FILTERS; j++) { - memcpy(&fp[j]->state[0], &filter_state_buffer[j][index], - MAX_FILTER_ORDER * sizeof(int32_t)); - } + memcpy(fir->state, firbuf - s->blocksize, MAX_FIR_ORDER * sizeof(int32_t)); + memcpy(iir->state, iirbuf - s->blocksize, MAX_IIR_ORDER * sizeof(int32_t)); } /** Read a block of PCM residual data (or actual if no filtering active). */ @@ -724,14 +765,12 @@ static int read_block_data(MLPDecodeContext *m, GetBitContext *gbp, memset(&m->bypassed_lsbs[s->blockpos][0], 0, s->blocksize * sizeof(m->bypassed_lsbs[0])); - for (i = 0; i < s->blocksize; i++) { + for (i = 0; i < s->blocksize; i++) if (read_huff_channels(m, gbp, substr, i) < 0) return -1; - } - for (ch = s->min_channel; ch <= s->max_channel; ch++) { + for (ch = s->min_channel; ch <= s->max_channel; ch++) filter_channel(m, substr, ch); - } s->blockpos += s->blocksize; @@ -832,22 +871,27 @@ static void rematrix_channels(MLPDecodeContext *m, unsigned int substr) int matrix_noise_shift = s->matrix_noise_shift[mat]; unsigned int dest_ch = s->matrix_out_ch[mat]; int32_t mask = MSB_MASK(s->quant_step_size[dest_ch]); + int32_t *coeffs = s->matrix_coeff[mat]; + int index = s->num_primitive_matrices - mat; + int index2 = 2 * index + 1; /* TODO: DSPContext? */ for (i = 0; i < s->blockpos; i++) { + int32_t bypassed_lsb = m->bypassed_lsbs[i][mat]; + int32_t *samples = m->sample_buffer[i]; int64_t accum = 0; - for (src_ch = 0; src_ch <= maxchan; src_ch++) { - accum += (int64_t)m->sample_buffer[i][src_ch] - * s->matrix_coeff[mat][src_ch]; - } + + for (src_ch = 0; src_ch <= maxchan; src_ch++) + accum += (int64_t) samples[src_ch] * coeffs[src_ch]; + if (matrix_noise_shift) { - uint32_t index = s->num_primitive_matrices - mat; - index = (i * (index * 2 + 1) + index) & (m->access_unit_size_pow2 - 1); + index &= m->access_unit_size_pow2 - 1; accum += m->noise_buffer[index] << (matrix_noise_shift + 7); + index += index2; } - m->sample_buffer[i][dest_ch] = ((accum >> 14) & mask) - + m->bypassed_lsbs[i][mat]; + + samples[dest_ch] = ((accum >> 14) & mask) + bypassed_lsb; } } } @@ -896,8 +940,10 @@ static int output_data(MLPDecodeContext *m, unsigned int substr, * otherwise returns the number of bytes consumed. */ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size, - const uint8_t *buf, int buf_size) + AVPacket *avpkt) { + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; MLPDecodeContext *m = avctx->priv_data; GetBitContext gb; unsigned int length, substr; @@ -918,10 +964,11 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size, init_get_bits(&gb, (buf + 4), (length - 4) * 8); + m->is_major_sync_unit = 0; if (show_bits_long(&gb, 31) == (0xf8726fba >> 1)) { - dprintf(m->avctx, "Found major sync.\n"); if (read_major_sync(m, &gb) < 0) goto error; + m->is_major_sync_unit = 1; header_size += 28; } @@ -935,10 +982,10 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size, substream_start = 0; for (substr = 0; substr < m->num_substreams; substr++) { - int extraword_present, checkdata_present, end; + int extraword_present, checkdata_present, end, nonrestart_substr; extraword_present = get_bits1(&gb); - skip_bits1(&gb); + nonrestart_substr = get_bits1(&gb); checkdata_present = get_bits1(&gb); skip_bits1(&gb); @@ -947,10 +994,19 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size, substr_header_size += 2; if (extraword_present) { + if (m->avctx->codec_id == CODEC_ID_MLP) { + av_log(m->avctx, AV_LOG_ERROR, "There must be no extraword for MLP.\n"); + goto error; + } skip_bits(&gb, 16); substr_header_size += 2; } + if (!(nonrestart_substr ^ m->is_major_sync_unit)) { + av_log(m->avctx, AV_LOG_ERROR, "Invalid nonrestart_substr.\n"); + goto error; + } + if (end + header_size + substr_header_size > length) { av_log(m->avctx, AV_LOG_ERROR, "Indicated length of substream %d data goes off end of " @@ -988,6 +1044,9 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size, SubStream *s = &m->substream[substr]; init_get_bits(&gb, buf, substream_data_len[substr] * 8); + m->matrix_changed = 0; + memset(m->filter_changed, 0, sizeof(m->filter_changed)); + s->blockpos = 0; do { if (get_bits1(&gb)) { @@ -998,66 +1057,64 @@ static int read_access_unit(AVCodecContext *avctx, void* data, int *data_size, s->restart_seen = 1; } - if (!s->restart_seen) { - av_log(m->avctx, AV_LOG_ERROR, - "No restart header present in substream %d.\n", - substr); + if (!s->restart_seen) goto next_substr; - } - if (read_decoding_params(m, &gb, substr) < 0) goto next_substr; } - if (!s->restart_seen) { - av_log(m->avctx, AV_LOG_ERROR, - "No restart header present in substream %d.\n", - substr); + if (!s->restart_seen) goto next_substr; - } if (read_block_data(m, &gb, substr) < 0) return -1; - } while ((get_bits_count(&gb) < substream_data_len[substr] * 8) - && get_bits1(&gb) == 0); + if (get_bits_count(&gb) >= substream_data_len[substr] * 8) + goto substream_length_mismatch; + + } while (!get_bits1(&gb)); skip_bits(&gb, (-get_bits_count(&gb)) & 15); - if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32 && - (show_bits_long(&gb, 32) == END_OF_STREAM || - show_bits_long(&gb, 20) == 0xd234e)) { - skip_bits(&gb, 18); + + if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 32) { + int shorten_by; + + if (get_bits(&gb, 16) != 0xD234) + return -1; + + shorten_by = get_bits(&gb, 16); + if (m->avctx->codec_id == CODEC_ID_TRUEHD && shorten_by & 0x2000) + s->blockpos -= FFMIN(shorten_by & 0x1FFF, s->blockpos); + else if (m->avctx->codec_id == CODEC_ID_MLP && shorten_by != 0xD234) + return -1; + if (substr == m->max_decoded_substream) av_log(m->avctx, AV_LOG_INFO, "End of stream indicated.\n"); - - if (get_bits1(&gb)) { - int shorten_by = get_bits(&gb, 13); - shorten_by = FFMIN(shorten_by, s->blockpos); - s->blockpos -= shorten_by; - } else - skip_bits(&gb, 13); } - if (substream_data_len[substr] * 8 - get_bits_count(&gb) >= 16 && - substream_parity_present[substr]) { + + if (substream_parity_present[substr]) { uint8_t parity, checksum; - parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2); - if ((parity ^ get_bits(&gb, 8)) != 0xa9) - av_log(m->avctx, AV_LOG_ERROR, - "Substream %d parity check failed.\n", substr); + if (substream_data_len[substr] * 8 - get_bits_count(&gb) != 16) + goto substream_length_mismatch; - checksum = ff_mlp_checksum8(buf, substream_data_len[substr] - 2); - if (checksum != get_bits(&gb, 8)) - av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n", - substr); - } - if (substream_data_len[substr] * 8 != get_bits_count(&gb)) { - av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", - substr); - return -1; + parity = ff_mlp_calculate_parity(buf, substream_data_len[substr] - 2); + checksum = ff_mlp_checksum8 (buf, substream_data_len[substr] - 2); + + if ((get_bits(&gb, 8) ^ parity) != 0xa9 ) + av_log(m->avctx, AV_LOG_ERROR, "Substream %d parity check failed.\n", substr); + if ( get_bits(&gb, 8) != checksum) + av_log(m->avctx, AV_LOG_ERROR, "Substream %d checksum failed.\n" , substr); } + if (substream_data_len[substr] * 8 != get_bits_count(&gb)) + goto substream_length_mismatch; + next_substr: + if (!s->restart_seen) + av_log(m->avctx, AV_LOG_ERROR, + "No restart header present in substream %d.\n", substr); + buf += substream_data_len[substr]; } @@ -1068,12 +1125,15 @@ next_substr: return length; +substream_length_mismatch: + av_log(m->avctx, AV_LOG_ERROR, "substream %d length mismatch\n", substr); + return -1; + error: m->params_valid = 0; return -1; } -#if CONFIG_MLP_DECODER AVCodec mlp_decoder = { "mlp", CODEC_TYPE_AUDIO, @@ -1085,7 +1145,6 @@ AVCodec mlp_decoder = { read_access_unit, .long_name = NULL_IF_CONFIG_SMALL("MLP (Meridian Lossless Packing)"), }; -#endif /* CONFIG_MLP_DECODER */ #if CONFIG_TRUEHD_DECODER AVCodec truehd_decoder = {