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ffmpeg.wasm-core
Commit d7fe1163 authored by Alexandra Hájková's avatar Alexandra Hájková Committed by Diego Biurrun
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motionpixels: Convert to the new bitstream reader

parent 00b6a765
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Showing with 40 additions and 37 deletions
libavcodec/motionpixels.c
View file @ d7fe1163
......@@ -20,7 +20,7 @@
*/
#include "avcodec.h"
#include "get_bits.h"
#include "bitstream.h"
#include "bswapdsp.h"
#include "internal.h"
......@@ -87,17 +87,18 @@ static av_cold int mp_decode_init(AVCodecContext *avctx)
return 0;
}
static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
static void mp_read_changes_map(MotionPixelsContext *mp, BitstreamContext *bc,
int count, int bits_len, int read_color)
{
uint16_t *pixels;
int offset, w, h, color = 0, x, y, i;
while (count--) {
offset = get_bits_long(gb, mp->offset_bits_len);
w = get_bits(gb, bits_len) + 1;
h = get_bits(gb, bits_len) + 1;
offset = bitstream_read(bc, mp->offset_bits_len);
w = bitstream_read(bc, bits_len) + 1;
h = bitstream_read(bc, bits_len) + 1;
if (read_color)
color = get_bits(gb, 15);
color = bitstream_read(bc, 15);
x = offset % mp->avctx->width;
y = offset / mp->avctx->width;
if (y >= mp->avctx->height)
......@@ -116,16 +117,17 @@ static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int
}
}
static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
static void mp_get_code(MotionPixelsContext *mp, BitstreamContext *bc,
int size, int code)
{
while (get_bits1(gb)) {
while (bitstream_read_bit(bc)) {
++size;
if (size > mp->max_codes_bits) {
av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
return;
}
code <<= 1;
mp_get_code(mp, gb, size, code + 1);
mp_get_code(mp, bc, size, code + 1);
}
if (mp->current_codes_count >= MAX_HUFF_CODES) {
av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
......@@ -135,18 +137,18 @@ static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, in
mp->codes[mp->current_codes_count++].size = size;
}
static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
static void mp_read_codes_table(MotionPixelsContext *mp, BitstreamContext *bc)
{
if (mp->codes_count == 1) {
mp->codes[0].delta = get_bits(gb, 4);
mp->codes[0].delta = bitstream_read(bc, 4);
} else {
int i;
mp->max_codes_bits = get_bits(gb, 4);
mp->max_codes_bits = bitstream_read(bc, 4);
for (i = 0; i < mp->codes_count; ++i)
mp->codes[i].delta = get_bits(gb, 4);
mp->codes[i].delta = bitstream_read(bc, 4);
mp->current_codes_count = 0;
mp_get_code(mp, gb, 0, 0);
mp_get_code(mp, bc, 0, 0);
}
}
......@@ -175,16 +177,16 @@ static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const Yuv
*(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
}
static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
static int mp_get_vlc(MotionPixelsContext *mp, BitstreamContext *bc)
{
int i;
i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
i = (mp->codes_count == 1) ? 0 : bitstream_read_vlc(bc, mp->vlc.table, mp->max_codes_bits, 1);
i = FFMIN(i, FF_ARRAY_ELEMS(mp->codes) - 1);
return mp->codes[i].delta;
}
static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
static void mp_decode_line(MotionPixelsContext *mp, BitstreamContext *bc, int y)
{
YuvPixel p;
const int y0 = y * mp->avctx->width;
......@@ -211,13 +213,13 @@ static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
p = mp_get_yuv_from_rgb(mp, x - 1, y);
} else {
p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
p.y += mp_gradient(mp, 0, mp_get_vlc(mp, bc));
p.y = av_clip_uintp2(p.y, 5);
if ((x & 3) == 0) {
if ((y & 3) == 0) {
p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
p.v += mp_gradient(mp, 1, mp_get_vlc(mp, bc));
p.v = av_clip_intp2(p.v, 5);
p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
p.u += mp_gradient(mp, 2, mp_get_vlc(mp, bc));
p.u = av_clip_intp2(p.u, 5);
mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
} else {
......@@ -231,7 +233,8 @@ static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
}
}
static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
static void mp_decode_frame_helper(MotionPixelsContext *mp,
BitstreamContext *bc)
{
YuvPixel p;
int y, y0;
......@@ -241,12 +244,12 @@ static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
p = mp_get_yuv_from_rgb(mp, 0, y);
} else {
p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
p.y += mp_gradient(mp, 0, mp_get_vlc(mp, bc));
p.y = av_clip_uintp2(p.y, 5);
if ((y & 3) == 0) {
p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
p.v += mp_gradient(mp, 1, mp_get_vlc(mp, bc));
p.v = av_clip_intp2(p.v, 5);
p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
p.u += mp_gradient(mp, 2, mp_get_vlc(mp, bc));
p.u = av_clip_intp2(p.u, 5);
}
mp->vpt[y] = p;
......@@ -255,7 +258,7 @@ static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
}
for (y0 = 0; y0 < 2; ++y0)
for (y = y0; y < mp->avctx->height; y += 2)
mp_decode_line(mp, gb, y);
mp_decode_line(mp, bc, y);
}
static int mp_decode_frame(AVCodecContext *avctx,
......@@ -265,7 +268,7 @@ static int mp_decode_frame(AVCodecContext *avctx,
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MotionPixelsContext *mp = avctx->priv_data;
GetBitContext gb;
BitstreamContext bc;
int i, count1, count2, sz, ret;
if ((ret = ff_reget_buffer(avctx, mp->frame)) < 0) {
......@@ -282,29 +285,29 @@ static int mp_decode_frame(AVCodecContext *avctx,
if (buf_size & 3)
memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
memset(mp->bswapbuf + buf_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
bitstream_init(&bc, mp->bswapbuf, buf_size * 8);
memset(mp->changes_map, 0, avctx->width * avctx->height);
for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
count1 = get_bits(&gb, 12);
count2 = get_bits(&gb, 12);
mp_read_changes_map(mp, &gb, count1, 8, i);
mp_read_changes_map(mp, &gb, count2, 4, i);
count1 = bitstream_read(&bc, 12);
count2 = bitstream_read(&bc, 12);
mp_read_changes_map(mp, &bc, count1, 8, i);
mp_read_changes_map(mp, &bc, count2, 4, i);
}
mp->codes_count = get_bits(&gb, 4);
mp->codes_count = bitstream_read(&bc, 4);
if (mp->codes_count == 0)
goto end;
if (mp->changes_map[0] == 0) {
*(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
*(uint16_t *)mp->frame->data[0] = bitstream_read(&bc, 15);
mp->changes_map[0] = 1;
}
mp_read_codes_table(mp, &gb);
mp_read_codes_table(mp, &bc);
sz = get_bits(&gb, 18);
sz = bitstream_read(&bc, 18);
if (avctx->extradata[0] != 5)
sz += get_bits(&gb, 18);
sz += bitstream_read(&bc, 18);
if (sz == 0)
goto end;
......@@ -312,7 +315,7 @@ static int mp_decode_frame(AVCodecContext *avctx,
goto end;
if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
goto end;
mp_decode_frame_helper(mp, &gb);
mp_decode_frame_helper(mp, &bc);
ff_free_vlc(&mp->vlc);
end:
......
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