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avcodec/wnv1: Move temporary variables from context to stack
Here it even leads to the complete removal of the context. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
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@ -30,11 +30,6 @@
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#include "internal.h"
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typedef struct WNV1Context {
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int shift;
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GetBitContext gb;
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} WNV1Context;
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static const uint16_t code_tab[16][2] = {
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{ 0x17F, 9 }, { 0xBF, 8 }, { 0x5F, 7 }, { 0x2F, 6 }, { 0x17, 5 }, { 0x0B, 4 }, { 0x005, 3 },
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{ 0x000, 1 },
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@ -45,26 +40,26 @@ static const uint16_t code_tab[16][2] = {
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static VLC code_vlc;
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/* returns modified base_value */
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static inline int wnv1_get_code(WNV1Context *w, int base_value)
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static inline int wnv1_get_code(GetBitContext *gb, int shift, int base_value)
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{
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int v = get_vlc2(&w->gb, code_vlc.table, CODE_VLC_BITS, 1);
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int v = get_vlc2(gb, code_vlc.table, CODE_VLC_BITS, 1);
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if (v == 15)
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return get_bits(&w->gb, 8 - w->shift) << w->shift;
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return get_bits(gb, 8 - shift) << shift;
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else
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return base_value + ((v - 7U) << w->shift);
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return base_value + ((v - 7U) << shift);
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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WNV1Context * const l = avctx->priv_data;
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AVFrame * const p = data;
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GetBitContext gb;
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unsigned char *Y,*U,*V;
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int i, j, ret;
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int i, j, ret, shift;
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int prev_y = 0, prev_u = 0, prev_v = 0;
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if (buf_size < 8 + avctx->height * (avctx->width/2)/8) {
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@ -76,24 +71,24 @@ static int decode_frame(AVCodecContext *avctx,
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return ret;
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p->key_frame = 1;
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if ((ret = init_get_bits8(&l->gb, buf + 8, buf_size - 8)) < 0)
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if ((ret = init_get_bits8(&gb, buf + 8, buf_size - 8)) < 0)
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return ret;
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if (buf[2] >> 4 == 6)
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l->shift = 2;
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shift = 2;
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else {
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l->shift = 8 - (buf[2] >> 4);
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if (l->shift > 4) {
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shift = 8 - (buf[2] >> 4);
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if (shift > 4) {
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avpriv_request_sample(avctx,
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"Unknown WNV1 frame header value %i",
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buf[2] >> 4);
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l->shift = 4;
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shift = 4;
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}
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if (l->shift < 1) {
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if (shift < 1) {
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avpriv_request_sample(avctx,
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"Unknown WNV1 frame header value %i",
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buf[2] >> 4);
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l->shift = 1;
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shift = 1;
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}
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}
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@ -102,10 +97,10 @@ static int decode_frame(AVCodecContext *avctx,
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V = p->data[2];
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for (j = 0; j < avctx->height; j++) {
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for (i = 0; i < avctx->width / 2; i++) {
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Y[i * 2] = wnv1_get_code(l, prev_y);
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prev_u = U[i] = wnv1_get_code(l, prev_u);
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prev_y = Y[(i * 2) + 1] = wnv1_get_code(l, Y[i * 2]);
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prev_v = V[i] = wnv1_get_code(l, prev_v);
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Y[i * 2] = wnv1_get_code(&gb, shift, prev_y);
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prev_u = U[i] = wnv1_get_code(&gb, shift, prev_u);
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prev_y = Y[(i * 2) + 1] = wnv1_get_code(&gb, shift, Y[i * 2]);
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prev_v = V[i] = wnv1_get_code(&gb, shift, prev_v);
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}
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Y += p->linesize[0];
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U += p->linesize[1];
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@ -138,7 +133,6 @@ AVCodec ff_wnv1_decoder = {
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.long_name = NULL_IF_CONFIG_SMALL("Winnov WNV1"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_WNV1,
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.priv_data_size = sizeof(WNV1Context),
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.init = decode_init,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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