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https://git.videolan.org/git/ffmpeg.git
synced 2024-08-29 20:56:12 +02:00
avcodec/bitstream: try to make vlc init code inherently thread safe
also remove spinlock, it doesnt work on AIX Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -163,7 +163,7 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
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int table_size, table_index, index, code_prefix, symbol, subtable_bits;
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int i, j, k, n, nb, inc;
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uint32_t code;
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VLC_TYPE (*table)[2];
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volatile VLC_TYPE (*table)[2];
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table_size = 1 << table_nb_bits;
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if (table_nb_bits > 30)
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@ -172,7 +172,7 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
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av_dlog(NULL, "new table index=%d size=%d\n", table_index, table_size);
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if (table_index < 0)
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return table_index;
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table = &vlc->table[table_index];
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table = (volatile VLC_TYPE (*)[2])&vlc->table[table_index];
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/* first pass: map codes and compute auxiliary table sizes */
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for (i = 0; i < nb_codes; i++) {
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@ -190,8 +190,9 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
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inc = 1 << n;
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}
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for (k = 0; k < nb; k++) {
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int bits = table[j][1];
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av_dlog(NULL, "%4x: code=%d n=%d\n", j, i, n);
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if (table[j][1] /*bits*/ != 0) {
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if (bits != 0 && bits != n) {
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av_log(NULL, AV_LOG_ERROR, "incorrect codes\n");
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return AVERROR_INVALIDDATA;
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}
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@ -226,7 +227,7 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
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if (index < 0)
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return index;
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/* note: realloc has been done, so reload tables */
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table = &vlc->table[table_index];
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table = (volatile VLC_TYPE (*)[2])&vlc->table[table_index];
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table[j][0] = index; //code
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av_assert0(table[j][0] == index);
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i = k-1;
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@ -268,7 +269,7 @@ static int build_table(VLC *vlc, int table_nb_bits, int nb_codes,
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'use_static' should be set to 1 for tables, which should be freed
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with av_free_static(), 0 if ff_free_vlc() will be used.
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*/
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int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
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int ff_init_vlc_sparse(VLC *vlc_arg, int nb_bits, int nb_codes,
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const void *bits, int bits_wrap, int bits_size,
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const void *codes, int codes_wrap, int codes_size,
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const void *symbols, int symbols_wrap, int symbols_size,
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@ -277,19 +278,16 @@ int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
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VLCcode *buf;
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int i, j, ret;
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VLCcode localbuf[1500]; // the maximum currently needed is 1296 by rv34
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void *state;
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VLC localvlc, *vlc;
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vlc = vlc_arg;
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vlc->bits = nb_bits;
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if (flags & INIT_VLC_USE_NEW_STATIC) {
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while (state = avpriv_atomic_ptr_cas(&vlc->init_state, NULL, vlc)) {
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if (state == vlc + 1) {
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av_assert0(vlc->table_size && vlc->table_size == vlc->table_allocated);
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return 0;
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}
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}
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av_assert0(!vlc->table_size);
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av_assert0(nb_codes + 1 <= FF_ARRAY_ELEMS(localbuf));
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buf = localbuf;
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localvlc = *vlc_arg;
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vlc = &localvlc;
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vlc->table_size = 0;
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} else {
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vlc->table = NULL;
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vlc->table_allocated = 0;
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@ -342,9 +340,9 @@ int ff_init_vlc_sparse(VLC *vlc, int nb_bits, int nb_codes,
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if (flags & INIT_VLC_USE_NEW_STATIC) {
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if(vlc->table_size != vlc->table_allocated)
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av_log(NULL, AV_LOG_ERROR, "needed %d had %d\n", vlc->table_size, vlc->table_allocated);
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state = avpriv_atomic_ptr_cas(&vlc->init_state, vlc, vlc+1);
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av_assert0(state == vlc);
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av_assert0(ret >= 0);
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*vlc_arg = *vlc;
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} else {
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av_free(buf);
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if (ret < 0) {
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@ -64,7 +64,6 @@ typedef struct VLC {
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int bits;
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VLC_TYPE (*table)[2]; ///< code, bits
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int table_size, table_allocated;
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void * volatile init_state;
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} VLC;
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typedef struct RL_VLC_ELEM {
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