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dnxhddec: handle cid change in bitstream.

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This commit is contained in:
Baptiste Coudurier 2011-06-26 14:08:22 -07:00
parent 90a40b226a
commit 721719dd0c
1 changed files with 11 additions and 5 deletions
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16
libavcodec/dnxhddec.c
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@ -63,7 +63,7 @@ static av_cold int dnxhd_decode_init(AVCodecContext *avctx)
static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
{
if (!ctx->cid_table) {
if (cid != ctx->cid) {
int index;
if ((index = ff_dnxhd_get_cid_table(cid)) < 0) {
@ -71,6 +71,11 @@ static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
return -1;
}
ctx->cid_table = &ff_dnxhd_cid_table[index];
free_vlc(&ctx->ac_vlc);
free_vlc(&ctx->dc_vlc);
free_vlc(&ctx->run_vlc);
init_vlc(&ctx->ac_vlc, DNXHD_VLC_BITS, 257,
ctx->cid_table->ac_bits, 1, 1,
ctx->cid_table->ac_codes, 2, 2, 0);
@ -82,6 +87,7 @@ static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
ctx->cid_table->run_codes, 2, 2, 0);
ff_init_scantable(ctx->dsp.idct_permutation, &ctx->scantable, ff_zigzag_direct);
ctx->cid = cid;
}
return 0;
}
@ -89,7 +95,7 @@ static int dnxhd_init_vlc(DNXHDContext *ctx, int cid)
static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_size, int first_field)
{
static const uint8_t header_prefix[] = { 0x00, 0x00, 0x02, 0x80, 0x01 };
int i;
int i, cid;
if (buf_size < 0x280)
return -1;
@ -115,10 +121,10 @@ static int dnxhd_decode_header(DNXHDContext *ctx, const uint8_t *buf, int buf_si
return -1;
}
ctx->cid = AV_RB32(buf + 0x28);
av_dlog(ctx->avctx, "compression id %d\n", ctx->cid);
cid = AV_RB32(buf + 0x28);
av_dlog(ctx->avctx, "compression id %d\n", cid);
if (dnxhd_init_vlc(ctx, ctx->cid) < 0)
if (dnxhd_init_vlc(ctx, cid) < 0)
return -1;
if (buf_size < ctx->cid_table->coding_unit_size) {