320 lines
10 KiB
C
320 lines
10 KiB
C
/*
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* Motion Pixels Video Decoder
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* Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dsputil.h"
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#define MAX_HUFF_CODES 16
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#include "motionpixels_tablegen.h"
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typedef struct HuffCode {
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int code;
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uint8_t size;
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uint8_t delta;
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} HuffCode;
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typedef struct MotionPixelsContext {
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AVCodecContext *avctx;
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AVFrame frame;
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DSPContext dsp;
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uint8_t *changes_map;
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int offset_bits_len;
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int codes_count, current_codes_count;
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int max_codes_bits;
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HuffCode codes[MAX_HUFF_CODES];
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VLC vlc;
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YuvPixel *vpt, *hpt;
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uint8_t gradient_scale[3];
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uint8_t *bswapbuf;
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int bswapbuf_size;
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} MotionPixelsContext;
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static av_cold int mp_decode_init(AVCodecContext *avctx)
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{
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MotionPixelsContext *mp = avctx->priv_data;
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motionpixels_tableinit();
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mp->avctx = avctx;
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dsputil_init(&mp->dsp, avctx);
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mp->changes_map = av_mallocz(avctx->width * avctx->height);
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mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
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mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
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mp->hpt = av_mallocz(avctx->height * avctx->width / 16 * sizeof(YuvPixel));
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avctx->pix_fmt = PIX_FMT_RGB555;
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avcodec_get_frame_defaults(&mp->frame);
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return 0;
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}
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static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
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{
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uint16_t *pixels;
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int offset, w, h, color = 0, x, y, i;
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while (count--) {
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offset = get_bits_long(gb, mp->offset_bits_len);
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w = get_bits(gb, bits_len) + 1;
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h = get_bits(gb, bits_len) + 1;
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if (read_color)
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color = get_bits(gb, 15);
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x = offset % mp->avctx->width;
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y = offset / mp->avctx->width;
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if (y >= mp->avctx->height)
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continue;
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w = FFMIN(w, mp->avctx->width - x);
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h = FFMIN(h, mp->avctx->height - y);
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pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
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while (h--) {
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mp->changes_map[offset] = w;
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if (read_color)
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for (i = 0; i < w; ++i)
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pixels[i] = color;
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offset += mp->avctx->width;
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pixels += mp->frame.linesize[0] / 2;
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}
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}
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}
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static void mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
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{
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while (get_bits1(gb)) {
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++size;
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if (size > mp->max_codes_bits) {
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av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
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return;
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}
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code <<= 1;
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mp_get_code(mp, gb, size, code + 1);
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}
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if (mp->current_codes_count >= MAX_HUFF_CODES) {
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av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
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return;
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}
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mp->codes[mp->current_codes_count ].code = code;
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mp->codes[mp->current_codes_count++].size = size;
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}
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static void mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
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{
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if (mp->codes_count == 1) {
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mp->codes[0].delta = get_bits(gb, 4);
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} else {
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int i;
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mp->max_codes_bits = get_bits(gb, 4);
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for (i = 0; i < mp->codes_count; ++i)
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mp->codes[i].delta = get_bits(gb, 4);
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mp->current_codes_count = 0;
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mp_get_code(mp, gb, 0, 0);
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}
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}
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static int mp_gradient(MotionPixelsContext *mp, int component, int v)
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{
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int delta;
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delta = (v - 7) * mp->gradient_scale[component];
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mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
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return delta;
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}
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static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
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{
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int color;
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color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
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return mp_rgb_yuv_table[color];
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}
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static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
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{
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int color;
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color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
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*(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
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}
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static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
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{
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int i;
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i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
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return mp->codes[i].delta;
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}
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static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
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{
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YuvPixel p;
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const int y0 = y * mp->avctx->width;
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int w, i, x = 0;
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p = mp->vpt[y];
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if (mp->changes_map[y0 + x] == 0) {
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memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
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++x;
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}
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while (x < mp->avctx->width) {
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w = mp->changes_map[y0 + x];
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if (w != 0) {
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if ((y & 3) == 0) {
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if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
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mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
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mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
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for (i = (x + 3) & ~3; i < x + w; i += 4) {
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mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
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}
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}
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}
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x += w;
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memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
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p = mp_get_yuv_from_rgb(mp, x - 1, y);
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} else {
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p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
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if ((x & 3) == 0) {
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if ((y & 3) == 0) {
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p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
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p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
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mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
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} else {
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p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
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p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
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}
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}
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mp_set_rgb_from_yuv(mp, x, y, &p);
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++x;
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}
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}
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}
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static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
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{
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YuvPixel p;
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int y, y0;
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for (y = 0; y < mp->avctx->height; ++y) {
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if (mp->changes_map[y * mp->avctx->width] != 0) {
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memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
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p = mp_get_yuv_from_rgb(mp, 0, y);
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} else {
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p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
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if ((y & 3) == 0) {
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p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
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p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
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}
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mp->vpt[y] = p;
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mp_set_rgb_from_yuv(mp, 0, y, &p);
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}
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}
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for (y0 = 0; y0 < 2; ++y0)
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for (y = y0; y < mp->avctx->height; y += 2)
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mp_decode_line(mp, gb, y);
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}
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static int mp_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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MotionPixelsContext *mp = avctx->priv_data;
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GetBitContext gb;
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int i, count1, count2, sz;
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mp->frame.reference = 1;
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mp->frame.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
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if (avctx->reget_buffer(avctx, &mp->frame)) {
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av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
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return -1;
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}
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/* le32 bitstream msb first */
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av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
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if (!mp->bswapbuf)
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return AVERROR(ENOMEM);
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mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
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if (buf_size & 3)
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memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
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init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
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memset(mp->changes_map, 0, avctx->width * avctx->height);
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for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
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count1 = get_bits(&gb, 12);
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count2 = get_bits(&gb, 12);
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mp_read_changes_map(mp, &gb, count1, 8, i);
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mp_read_changes_map(mp, &gb, count2, 4, i);
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}
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mp->codes_count = get_bits(&gb, 4);
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if (mp->codes_count == 0)
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goto end;
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if (mp->changes_map[0] == 0) {
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*(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
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mp->changes_map[0] = 1;
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}
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mp_read_codes_table(mp, &gb);
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sz = get_bits(&gb, 18);
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if (avctx->extradata[0] != 5)
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sz += get_bits(&gb, 18);
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if (sz == 0)
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goto end;
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if (mp->max_codes_bits <= 0)
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goto end;
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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))
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goto end;
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mp_decode_frame_helper(mp, &gb);
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free_vlc(&mp->vlc);
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end:
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*data_size = sizeof(AVFrame);
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*(AVFrame *)data = mp->frame;
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return buf_size;
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}
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static av_cold int mp_decode_end(AVCodecContext *avctx)
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{
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MotionPixelsContext *mp = avctx->priv_data;
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av_freep(&mp->changes_map);
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av_freep(&mp->vpt);
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av_freep(&mp->hpt);
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av_freep(&mp->bswapbuf);
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if (mp->frame.data[0])
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avctx->release_buffer(avctx, &mp->frame);
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return 0;
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}
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AVCodec ff_motionpixels_decoder = {
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.name = "motionpixels",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_MOTIONPIXELS,
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.priv_data_size = sizeof(MotionPixelsContext),
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.init = mp_decode_init,
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.close = mp_decode_end,
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.decode = mp_decode_frame,
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.capabilities = CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
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};
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