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avcodec/mpc7: Make decoder init-threadsafe

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Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
This commit is contained in:
Andreas Rheinhardt 2020-11-15 21:21:48 +01:00
parent 33aaf86192
commit 3dee5fa19e
1 changed files with 34 additions and 31 deletions
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65
libavcodec/mpc7.c
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@ -28,6 +28,7 @@
#include "libavutil/channel_layout.h"
#include "libavutil/internal.h"
#include "libavutil/lfg.h"
#include "libavutil/thread.h"
#include "avcodec.h"
#include "get_bits.h"
#include "internal.h"
@ -38,16 +39,42 @@
static VLC scfi_vlc, dscf_vlc, hdr_vlc, quant_vlc[MPC7_QUANT_VLC_TABLES][2];
static av_cold void mpc7_init_static(void)
{
static VLC_TYPE quant_tables[7224][2];
const uint8_t *raw_quant_table = mpc7_quant_vlcs;
INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
&mpc7_scfi[1], 2,
&mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS);
INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
&mpc7_dscf[1], 2,
&mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS);
INIT_VLC_STATIC_FROM_LENGTHS(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
&mpc7_hdr[1], 2,
&mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS);
for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){
for (int j = 0; j < 2; j++) {
quant_vlc[i][j].table = &quant_tables[offset];
quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset;
ff_init_vlc_from_lengths(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
&raw_quant_table[1], 2,
&raw_quant_table[0], 2, 1,
mpc7_quant_vlc_off[i],
INIT_VLC_STATIC_OVERLONG, NULL);
raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
offset += quant_vlc[i][j].table_size;
}
}
ff_mpa_synth_init_fixed();
}
static av_cold int mpc7_decode_init(AVCodecContext * avctx)
{
int j;
static AVOnce init_static_once = AV_ONCE_INIT;
MPCContext *c = avctx->priv_data;
GetBitContext gb;
LOCAL_ALIGNED_16(uint8_t, buf, [16]);
static int vlc_initialized = 0;
static VLC_TYPE quant_tables[7224][2];
const uint8_t *raw_quant_table = mpc7_quant_vlcs;
/* Musepack SV7 is always stereo */
if (avctx->channels != 2) {
@ -83,32 +110,7 @@ static av_cold int mpc7_decode_init(AVCodecContext * avctx)
avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
avctx->channel_layout = AV_CH_LAYOUT_STEREO;
if(vlc_initialized) return 0;
av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
INIT_VLC_STATIC_FROM_LENGTHS(&scfi_vlc, MPC7_SCFI_BITS, MPC7_SCFI_SIZE,
&mpc7_scfi[1], 2,
&mpc7_scfi[0], 2, 1, 0, 0, 1 << MPC7_SCFI_BITS);
INIT_VLC_STATIC_FROM_LENGTHS(&dscf_vlc, MPC7_DSCF_BITS, MPC7_DSCF_SIZE,
&mpc7_dscf[1], 2,
&mpc7_dscf[0], 2, 1, -7, 0, 1 << MPC7_DSCF_BITS);
INIT_VLC_STATIC_FROM_LENGTHS(&hdr_vlc, MPC7_HDR_BITS, MPC7_HDR_SIZE,
&mpc7_hdr[1], 2,
&mpc7_hdr[0], 2, 1, -5, 0, 1 << MPC7_HDR_BITS);
for (unsigned i = 0, offset = 0; i < MPC7_QUANT_VLC_TABLES; i++){
for(j = 0; j < 2; j++){
quant_vlc[i][j].table = &quant_tables[offset];
quant_vlc[i][j].table_allocated = FF_ARRAY_ELEMS(quant_tables) - offset;
ff_init_vlc_from_lengths(&quant_vlc[i][j], 9, mpc7_quant_vlc_sizes[i],
&raw_quant_table[1], 2,
&raw_quant_table[0], 2, 1,
mpc7_quant_vlc_off[i],
INIT_VLC_STATIC_OVERLONG, NULL);
raw_quant_table += 2 * mpc7_quant_vlc_sizes[i];
offset += quant_vlc[i][j].table_size;
}
}
vlc_initialized = 1;
ff_mpa_synth_init_fixed();
ff_thread_once(&init_static_once, mpc7_init_static);
return 0;
}
@ -317,4 +319,5 @@ AVCodec ff_mpc7_decoder = {
.capabilities = AV_CODEC_CAP_DR1,
.sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
AV_SAMPLE_FMT_NONE },
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};