From 0496a034137525dd3a22c179b0e24b56305d9f45 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 18 Feb 2004 14:05:49 +0000 Subject: [PATCH] simplify only change context if frame header is error-free, as some fields may not be stored in the frame header and so a single damaged frame-header may trash them Originally committed as revision 2796 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/flac.c | 93 +++++++++++++++++++++-------------------------- 1 file changed, 41 insertions(+), 52 deletions(-) diff --git a/libavcodec/flac.c b/libavcodec/flac.c index 822ebc2dfb..d58afd9d3b 100644 --- a/libavcodec/flac.c +++ b/libavcodec/flac.c @@ -69,6 +69,11 @@ static int sample_rate_table[] = static int sample_size_table[] = { 0, 8, 12, 0, 16, 20, 24, 0 }; +static 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 const uint8_t table_crc8[256] = { 0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15, 0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d, @@ -168,7 +173,6 @@ static void allocate_buffers(FLACContext *s){ } s->bitstream= av_fast_realloc(s->bitstream, &s->allocated_bitstream_size, s->max_framesize); -// s->bitstream= av_realloc(s->bitstream, s->max_framesize); } static void metadata_streaminfo(FLACContext *s) @@ -227,10 +231,6 @@ static int decode_residuals(FLACContext *s, int channel, int pred_order) // 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); - if(get_bits_count(&s->gb) > s->gb.size_in_bits){ - av_log(s->avctx, AV_LOG_ERROR, "fucking FLAC\n"); - return -1; - } } } i= 0; @@ -433,39 +433,29 @@ static inline int decode_subframe(FLACContext *s, int channel) static int decode_frame(FLACContext *s) { 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->decorrelation = INDEPENDENT; - if (s->channels != assignment+1) - av_log(s->avctx, AV_LOG_DEBUG, "channel number and number of assigned channels differ!\n"); -// av_log(s->avctx, AV_LOG_DEBUG, "channels: %d\n", assignment+1); - } - else if (assignment < 11) - { - s->decorrelation= LEFT_SIDE + assignment - 8; - } + 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_DEBUG, "unsupported channel assignment\n"); - return -1; - } - - if ((assignment >= 8) && (s->channels != 2)) - { + av_log(s->avctx, AV_LOG_DEBUG, "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) - s->bps = sample_size_table[sample_size_code]; - - if ((sample_size_code == 3) || (sample_size_code == 7)) + 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_DEBUG, "invalid sample size code (%d)\n", sample_size_code); return -1; @@ -474,50 +464,44 @@ static int decode_frame(FLACContext *s) if (get_bits1(&s->gb)) { av_log(s->avctx, AV_LOG_DEBUG, "broken stream, invalid padding\n"); -// return -1; + 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)){ - if(get_utf8(&s->gb) < 0){ - av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n"); - return -1; - } }else{ - if(get_utf8(&s->gb) < 0){ - av_log(s->avctx, AV_LOG_ERROR, "utf8 fscked\n"); - return -1; - } } - +#endif + if (blocksize_code == 0) - s->blocksize = s->min_blocksize; - else if (blocksize_code == 1) - s->blocksize = 192; - else if (blocksize_code <= 5) - s->blocksize = 576 << (blocksize_code - 2); + blocksize = s->min_blocksize; else if (blocksize_code == 6) - s->blocksize = get_bits(&s->gb, 8)+1; + blocksize = get_bits(&s->gb, 8)+1; else if (blocksize_code == 7) - s->blocksize = get_bits(&s->gb, 16)+1; - else if (blocksize_code >= 8) - s->blocksize = 256 << (blocksize_code - 8); + blocksize = get_bits(&s->gb, 16)+1; + else + blocksize = blocksize_table[blocksize_code]; - if(s->blocksize > s->max_blocksize){ - av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", s->blocksize, s->max_blocksize); + if(blocksize > s->max_blocksize){ + av_log(s->avctx, AV_LOG_ERROR, "blocksize %d > %d\n", blocksize, s->max_blocksize); return -1; } if (sample_rate_code == 0){ - //Streaminfo + samplerate= s->samplerate; }else if ((sample_rate_code > 3) && (sample_rate_code < 12)) - s->samplerate = sample_rate_table[sample_rate_code]; + samplerate = sample_rate_table[sample_rate_code]; else if (sample_rate_code == 12) - s->samplerate = get_bits(&s->gb, 8) * 1000; + samplerate = get_bits(&s->gb, 8) * 1000; else if (sample_rate_code == 13) - s->samplerate = get_bits(&s->gb, 16); + samplerate = get_bits(&s->gb, 16); else if (sample_rate_code == 14) - s->samplerate = get_bits(&s->gb, 16) * 10; + 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; @@ -529,6 +513,11 @@ static int decode_frame(FLACContext *s) av_log(s->avctx, AV_LOG_ERROR, "header crc missmatch crc=%2X\n", crc8); return -1; } + + s->blocksize = blocksize; + s->samplerate = samplerate; + s->bps = bps; + s->decorrelation= decorrelation; // dump_headers(s);