yading@10: /*
yading@10:  * Motion Pixels Video Decoder
yading@10:  * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "dsputil.h"
yading@10: #include "internal.h"
yading@10: 
yading@10: #define MAX_HUFF_CODES 16
yading@10: 
yading@10: #include "motionpixels_tablegen.h"
yading@10: 
yading@10: typedef struct HuffCode {
yading@10:     int code;
yading@10:     uint8_t size;
yading@10:     uint8_t delta;
yading@10: } HuffCode;
yading@10: 
yading@10: typedef struct MotionPixelsContext {
yading@10:     AVCodecContext *avctx;
yading@10:     AVFrame frame;
yading@10:     DSPContext dsp;
yading@10:     uint8_t *changes_map;
yading@10:     int offset_bits_len;
yading@10:     int codes_count, current_codes_count;
yading@10:     int max_codes_bits;
yading@10:     HuffCode codes[MAX_HUFF_CODES];
yading@10:     VLC vlc;
yading@10:     YuvPixel *vpt, *hpt;
yading@10:     uint8_t gradient_scale[3];
yading@10:     uint8_t *bswapbuf;
yading@10:     int bswapbuf_size;
yading@10: } MotionPixelsContext;
yading@10: 
yading@10: static av_cold int mp_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     MotionPixelsContext *mp = avctx->priv_data;
yading@10:     int w4 = (avctx->width  + 3) & ~3;
yading@10:     int h4 = (avctx->height + 3) & ~3;
yading@10: 
yading@10:     if(avctx->extradata_size < 2){
yading@10:         av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     motionpixels_tableinit();
yading@10:     mp->avctx = avctx;
yading@10:     ff_dsputil_init(&mp->dsp, avctx);
yading@10:     mp->changes_map = av_mallocz(avctx->width * h4);
yading@10:     mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
yading@10:     mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel));
yading@10:     mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel));
yading@10:     avctx->pix_fmt = AV_PIX_FMT_RGB555;
yading@10:     avcodec_get_frame_defaults(&mp->frame);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
yading@10: {
yading@10:     uint16_t *pixels;
yading@10:     int offset, w, h, color = 0, x, y, i;
yading@10: 
yading@10:     while (count--) {
yading@10:         offset = get_bits_long(gb, mp->offset_bits_len);
yading@10:         w      = get_bits(gb, bits_len) + 1;
yading@10:         h      = get_bits(gb, bits_len) + 1;
yading@10:         if (read_color)
yading@10:             color = get_bits(gb, 15);
yading@10:         x = offset % mp->avctx->width;
yading@10:         y = offset / mp->avctx->width;
yading@10:         if (y >= mp->avctx->height)
yading@10:             continue;
yading@10:         w = FFMIN(w, mp->avctx->width  - x);
yading@10:         h = FFMIN(h, mp->avctx->height - y);
yading@10:         pixels = (uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
yading@10:         while (h--) {
yading@10:             mp->changes_map[offset] = w;
yading@10:             if (read_color)
yading@10:                 for (i = 0; i < w; ++i)
yading@10:                     pixels[i] = color;
yading@10:             offset += mp->avctx->width;
yading@10:             pixels += mp->frame.linesize[0] / 2;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
yading@10: {
yading@10:     while (get_bits1(gb)) {
yading@10:         ++size;
yading@10:         if (size > mp->max_codes_bits) {
yading@10:             av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         code <<= 1;
yading@10:         if (mp_get_code(mp, gb, size, code + 1) < 0)
yading@10:             return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     if (mp->current_codes_count >= MAX_HUFF_CODES) {
yading@10:         av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     mp->codes[mp->current_codes_count  ].code = code;
yading@10:     mp->codes[mp->current_codes_count++].size = size;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
yading@10: {
yading@10:     if (mp->codes_count == 1) {
yading@10:         mp->codes[0].delta = get_bits(gb, 4);
yading@10:     } else {
yading@10:         int i;
yading@10:         int ret;
yading@10: 
yading@10:         mp->max_codes_bits = get_bits(gb, 4);
yading@10:         for (i = 0; i < mp->codes_count; ++i)
yading@10:             mp->codes[i].delta = get_bits(gb, 4);
yading@10:         mp->current_codes_count = 0;
yading@10:         if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
yading@10:             return ret;
yading@10:         if (mp->current_codes_count < mp->codes_count) {
yading@10:             av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:    }
yading@10:    return 0;
yading@10: }
yading@10: 
yading@10: static int mp_gradient(MotionPixelsContext *mp, int component, int v)
yading@10: {
yading@10:     int delta;
yading@10: 
yading@10:     delta = (v - 7) * mp->gradient_scale[component];
yading@10:     mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
yading@10:     return delta;
yading@10: }
yading@10: 
yading@10: static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
yading@10: {
yading@10:     int color;
yading@10: 
yading@10:     color = *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2];
yading@10:     return mp_rgb_yuv_table[color];
yading@10: }
yading@10: 
yading@10: static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
yading@10: {
yading@10:     int color;
yading@10: 
yading@10:     color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
yading@10:     *(uint16_t *)&mp->frame.data[0][y * mp->frame.linesize[0] + x * 2] = color;
yading@10: }
yading@10: 
yading@10: static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
yading@10: {
yading@10:     int i;
yading@10: 
yading@10:     i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
yading@10:     return mp->codes[i].delta;
yading@10: }
yading@10: 
yading@10: static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
yading@10: {
yading@10:     YuvPixel p;
yading@10:     const int y0 = y * mp->avctx->width;
yading@10:     int w, i, x = 0;
yading@10: 
yading@10:     p = mp->vpt[y];
yading@10:     if (mp->changes_map[y0 + x] == 0) {
yading@10:         memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
yading@10:         ++x;
yading@10:     }
yading@10:     while (x < mp->avctx->width) {
yading@10:         w = mp->changes_map[y0 + x];
yading@10:         if (w != 0) {
yading@10:             if ((y & 3) == 0) {
yading@10:                 if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
yading@10:                     mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
yading@10:                     mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
yading@10:                     for (i = (x + 3) & ~3; i < x + w; i += 4) {
yading@10:                         mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
yading@10:                     }
yading@10:                 }
yading@10:             }
yading@10:             x += w;
yading@10:             memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
yading@10:             p = mp_get_yuv_from_rgb(mp, x - 1, y);
yading@10:         } else {
yading@10:             p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
yading@10:             p.y = av_clip(p.y, 0, 31);
yading@10:             if ((x & 3) == 0) {
yading@10:                 if ((y & 3) == 0) {
yading@10:                     p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
yading@10:                     p.v = av_clip(p.v, -32, 31);
yading@10:                     p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
yading@10:                     p.u = av_clip(p.u, -32, 31);
yading@10:                     mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
yading@10:                 } else {
yading@10:                     p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
yading@10:                     p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
yading@10:                 }
yading@10:             }
yading@10:             mp_set_rgb_from_yuv(mp, x, y, &p);
yading@10:             ++x;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
yading@10: {
yading@10:     YuvPixel p;
yading@10:     int y, y0;
yading@10: 
yading@10:     av_assert1(mp->changes_map[0]);
yading@10: 
yading@10:     for (y = 0; y < mp->avctx->height; ++y) {
yading@10:         if (mp->changes_map[y * mp->avctx->width] != 0) {
yading@10:             memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
yading@10:             p = mp_get_yuv_from_rgb(mp, 0, y);
yading@10:         } else {
yading@10:             p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
yading@10:             p.y = av_clip(p.y, 0, 31);
yading@10:             if ((y & 3) == 0) {
yading@10:                 p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
yading@10:                 p.v = av_clip(p.v, -32, 31);
yading@10:                 p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
yading@10:                 p.u = av_clip(p.u, -32, 31);
yading@10:             }
yading@10:             mp->vpt[y] = p;
yading@10:             mp_set_rgb_from_yuv(mp, 0, y, &p);
yading@10:         }
yading@10:     }
yading@10:     for (y0 = 0; y0 < 2; ++y0)
yading@10:         for (y = y0; y < mp->avctx->height; y += 2)
yading@10:             mp_decode_line(mp, gb, y);
yading@10: }
yading@10: 
yading@10: static int mp_decode_frame(AVCodecContext *avctx,
yading@10:                                  void *data, int *got_frame,
yading@10:                                  AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size = avpkt->size;
yading@10:     MotionPixelsContext *mp = avctx->priv_data;
yading@10:     GetBitContext gb;
yading@10:     int i, count1, count2, sz, ret;
yading@10: 
yading@10:     if ((ret = ff_reget_buffer(avctx, &mp->frame)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     /* le32 bitstream msb first */
yading@10:     av_fast_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:     if (!mp->bswapbuf)
yading@10:         return AVERROR(ENOMEM);
yading@10:     mp->dsp.bswap_buf((uint32_t *)mp->bswapbuf, (const uint32_t *)buf, buf_size / 4);
yading@10:     if (buf_size & 3)
yading@10:         memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
yading@10:     memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
yading@10:     init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
yading@10: 
yading@10:     memset(mp->changes_map, 0, avctx->width * avctx->height);
yading@10:     for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
yading@10:         count1 = get_bits(&gb, 12);
yading@10:         count2 = get_bits(&gb, 12);
yading@10:         mp_read_changes_map(mp, &gb, count1, 8, i);
yading@10:         mp_read_changes_map(mp, &gb, count2, 4, i);
yading@10:     }
yading@10: 
yading@10:     mp->codes_count = get_bits(&gb, 4);
yading@10:     if (mp->codes_count == 0)
yading@10:         goto end;
yading@10: 
yading@10:     if (mp->changes_map[0] == 0) {
yading@10:         *(uint16_t *)mp->frame.data[0] = get_bits(&gb, 15);
yading@10:         mp->changes_map[0] = 1;
yading@10:     }
yading@10:     if (mp_read_codes_table(mp, &gb) < 0)
yading@10:         goto end;
yading@10: 
yading@10:     sz = get_bits(&gb, 18);
yading@10:     if (avctx->extradata[0] != 5)
yading@10:         sz += get_bits(&gb, 18);
yading@10:     if (sz == 0)
yading@10:         goto end;
yading@10: 
yading@10:     if (mp->max_codes_bits <= 0)
yading@10:         goto end;
yading@10:     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))
yading@10:         goto end;
yading@10:     mp_decode_frame_helper(mp, &gb);
yading@10:     ff_free_vlc(&mp->vlc);
yading@10: 
yading@10: end:
yading@10:     if ((ret = av_frame_ref(data, &mp->frame)) < 0)
yading@10:         return ret;
yading@10:     *got_frame       = 1;
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: static av_cold int mp_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     MotionPixelsContext *mp = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&mp->changes_map);
yading@10:     av_freep(&mp->vpt);
yading@10:     av_freep(&mp->hpt);
yading@10:     av_freep(&mp->bswapbuf);
yading@10:     av_frame_unref(&mp->frame);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_motionpixels_decoder = {
yading@10:     .name           = "motionpixels",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_MOTIONPIXELS,
yading@10:     .priv_data_size = sizeof(MotionPixelsContext),
yading@10:     .init           = mp_decode_init,
yading@10:     .close          = mp_decode_end,
yading@10:     .decode         = mp_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
yading@10: };