#include <inttypes.h>
+#include "libavutil/thread.h"
+
#define BITSTREAM_READER_LE
#include "avcodec.h"
#include "bytestream.h"
+#include "codec_internal.h"
+#include "decode.h"
#include "get_bits.h"
-#include "internal.h"
#include "mathops.h"
#include "tscc2data.h"
+#define TSCC2_VLC_BITS 9
+
typedef struct TSCC2Context {
AVCodecContext *avctx;
AVFrame *pic;
int q[2][3];
GetBitContext gb;
- VLC dc_vlc, nc_vlc[NUM_VLC_SETS], ac_vlc[NUM_VLC_SETS];
int block[16];
} TSCC2Context;
-static av_cold void free_vlcs(TSCC2Context *c)
-{
- int i;
+static VLC dc_vlc, nc_vlc[NUM_VLC_SETS], ac_vlc[NUM_VLC_SETS];
- ff_free_vlc(&c->dc_vlc);
- for (i = 0; i < NUM_VLC_SETS; i++) {
- ff_free_vlc(c->nc_vlc + i);
- ff_free_vlc(c->ac_vlc + i);
- }
+static av_cold void tscc2_init_vlc(VLC *vlc, int *offset, int nb_codes,
+ const uint8_t *lens, const void *syms,
+ int sym_length)
+{
+ static VLCElem vlc_buf[15442];
+
+ vlc->table = &vlc_buf[*offset];
+ vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *offset;
+ ff_vlc_init_from_lengths(vlc, TSCC2_VLC_BITS, nb_codes,
+ lens, 1, syms, sym_length, sym_length, 0,
+ VLC_INIT_STATIC_OVERLONG | VLC_INIT_OUTPUT_LE, NULL);
+ *offset += vlc->table_size;
}
-static av_cold int init_vlcs(TSCC2Context *c)
+static av_cold void tscc2_init_vlcs(void)
{
- int i, ret;
+ const uint16_t *ac_vlc_syms = tscc2_ac_vlc_syms;
+ const uint8_t *ac_vlc_lens = tscc2_ac_vlc_lens;
+ int i, offset = 0;
- ret = ff_init_vlc_sparse(&c->dc_vlc, 9, DC_VLC_COUNT,
- tscc2_dc_vlc_bits, 1, 1,
- tscc2_dc_vlc_codes, 2, 2,
- tscc2_dc_vlc_syms, 2, 2, INIT_VLC_LE);
- if (ret)
- return ret;
+ tscc2_init_vlc(&dc_vlc, &offset, DC_VLC_COUNT,
+ tscc2_dc_vlc_lens, tscc2_dc_vlc_syms, 2);
for (i = 0; i < NUM_VLC_SETS; i++) {
- ret = ff_init_vlc_sparse(c->nc_vlc + i, 9, 16,
- tscc2_nc_vlc_bits[i], 1, 1,
- tscc2_nc_vlc_codes[i], 2, 2,
- tscc2_nc_vlc_syms, 1, 1, INIT_VLC_LE);
- if (ret) {
- free_vlcs(c);
- return ret;
- }
- ret = ff_init_vlc_sparse(c->ac_vlc + i, 9, tscc2_ac_vlc_sizes[i],
- tscc2_ac_vlc_bits[i], 1, 1,
- tscc2_ac_vlc_codes[i], 2, 2,
- tscc2_ac_vlc_syms[i], 2, 2, INIT_VLC_LE);
- if (ret) {
- free_vlcs(c);
- return ret;
- }
- }
+ tscc2_init_vlc(&nc_vlc[i], &offset, 16,
+ tscc2_nc_vlc_lens[i], tscc2_nc_vlc_syms[i], 1);
- return 0;
+ tscc2_init_vlc(&ac_vlc[i], &offset, tscc2_ac_vlc_sizes[i],
+ ac_vlc_lens, ac_vlc_syms, 2);
+ ac_vlc_lens += tscc2_ac_vlc_sizes[i];
+ ac_vlc_syms += tscc2_ac_vlc_sizes[i];
+ }
}
#define DEQUANT(val, q) (((q) * (val) + 0x80) >> 8)
if (!(j | k)) {
dc = get_bits(gb, 8);
} else {
- dc = get_vlc2(gb, c->dc_vlc.table, 9, 2);
- if (dc == -1)
- return AVERROR_INVALIDDATA;
+ dc = get_vlc2(gb, dc_vlc.table, TSCC2_VLC_BITS, 2);
if (dc == 0x100)
dc = get_bits(gb, 8);
}
prev_dc = dc;
c->block[0] = dc;
- nc = get_vlc2(gb, c->nc_vlc[vlc_set].table, 9, 1);
- if (nc == -1)
- return AVERROR_INVALIDDATA;
+ nc = get_vlc2(gb, nc_vlc[vlc_set].table, TSCC2_VLC_BITS, 1);
bpos = 1;
memset(c->block + 1, 0, 15 * sizeof(*c->block));
for (l = 0; l < nc; l++) {
- ac = get_vlc2(gb, c->ac_vlc[vlc_set].table, 9, 2);
- if (ac == -1)
- return AVERROR_INVALIDDATA;
+ ac = get_vlc2(gb, ac_vlc[vlc_set].table, TSCC2_VLC_BITS, 2);
if (ac == 0x1000)
ac = get_bits(gb, 12);
bpos += ac & 0xF;
return 0;
}
-static int tscc2_decode_frame(AVCodecContext *avctx, void *data,
+static int tscc2_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
int *got_frame, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
}
*got_frame = 1;
- if ((ret = av_frame_ref(data, c->pic)) < 0)
+ if ((ret = av_frame_ref(rframe, c->pic)) < 0)
return ret;
/* always report that the buffer was completely consumed */
av_frame_free(&c->pic);
av_freep(&c->slice_quants);
- free_vlcs(c);
return 0;
}
static av_cold int tscc2_decode_init(AVCodecContext *avctx)
{
TSCC2Context * const c = avctx->priv_data;
- int ret;
+ static AVOnce init_static_once = AV_ONCE_INIT;
c->avctx = avctx;
avctx->pix_fmt = AV_PIX_FMT_YUV444P;
- if ((ret = init_vlcs(c)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "Cannot initialise VLCs\n");
- return ret;
- }
-
c->mb_width = FFALIGN(avctx->width, 16) >> 4;
c->mb_height = FFALIGN(avctx->height, 8) >> 3;
c->slice_quants = av_malloc(c->mb_width * c->mb_height);
if (!c->slice_quants) {
av_log(avctx, AV_LOG_ERROR, "Cannot allocate slice information\n");
- free_vlcs(c);
return AVERROR(ENOMEM);
}
c->pic = av_frame_alloc();
- if (!c->pic) {
- tscc2_decode_end(avctx);
+ if (!c->pic)
return AVERROR(ENOMEM);
- }
+
+ ff_thread_once(&init_static_once, tscc2_init_vlcs);
return 0;
}
-AVCodec ff_tscc2_decoder = {
- .name = "tscc2",
- .long_name = NULL_IF_CONFIG_SMALL("TechSmith Screen Codec 2"),
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_TSCC2,
+const FFCodec ff_tscc2_decoder = {
+ .p.name = "tscc2",
+ CODEC_LONG_NAME("TechSmith Screen Codec 2"),
+ .p.type = AVMEDIA_TYPE_VIDEO,
+ .p.id = AV_CODEC_ID_TSCC2,
.priv_data_size = sizeof(TSCC2Context),
.init = tscc2_decode_init,
.close = tscc2_decode_end,
- .decode = tscc2_decode_frame,
- .capabilities = AV_CODEC_CAP_DR1,
+ FF_CODEC_DECODE_CB(tscc2_decode_frame),
+ .p.capabilities = AV_CODEC_CAP_DR1,
+ .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
};
projects / platform / upstream / ffmpeg.git / blobdiff