| /* |
| * Motion Pixels Video Decoder |
| * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2.1 of the License, or (at your option) any later version. |
| * |
| * FFmpeg is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "avcodec.h" |
| #include "get_bits.h" |
| #include "bswapdsp.h" |
| #include "internal.h" |
| |
| #define MAX_HUFF_CODES 16 |
| |
| #include "motionpixels_tablegen.h" |
| |
| typedef struct HuffCode { |
| int code; |
| uint8_t size; |
| uint8_t delta; |
| } HuffCode; |
| |
| typedef struct MotionPixelsContext { |
| AVCodecContext *avctx; |
| AVFrame *frame; |
| BswapDSPContext bdsp; |
| uint8_t *changes_map; |
| int offset_bits_len; |
| int codes_count, current_codes_count; |
| int max_codes_bits; |
| HuffCode codes[MAX_HUFF_CODES]; |
| VLC vlc; |
| YuvPixel *vpt, *hpt; |
| uint8_t gradient_scale[3]; |
| uint8_t *bswapbuf; |
| int bswapbuf_size; |
| } MotionPixelsContext; |
| |
| static av_cold int mp_decode_end(AVCodecContext *avctx) |
| { |
| MotionPixelsContext *mp = avctx->priv_data; |
| |
| av_freep(&mp->changes_map); |
| av_freep(&mp->vpt); |
| av_freep(&mp->hpt); |
| av_freep(&mp->bswapbuf); |
| av_frame_free(&mp->frame); |
| |
| return 0; |
| } |
| |
| static av_cold int mp_decode_init(AVCodecContext *avctx) |
| { |
| MotionPixelsContext *mp = avctx->priv_data; |
| int w4 = (avctx->width + 3) & ~3; |
| int h4 = (avctx->height + 3) & ~3; |
| |
| if(avctx->extradata_size < 2){ |
| av_log(avctx, AV_LOG_ERROR, "extradata too small\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| motionpixels_tableinit(); |
| mp->avctx = avctx; |
| ff_bswapdsp_init(&mp->bdsp); |
| mp->changes_map = av_mallocz_array(avctx->width, h4); |
| mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1; |
| mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel)); |
| mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel)); |
| if (!mp->changes_map || !mp->vpt || !mp->hpt) { |
| av_freep(&mp->changes_map); |
| av_freep(&mp->vpt); |
| av_freep(&mp->hpt); |
| return AVERROR(ENOMEM); |
| } |
| avctx->pix_fmt = AV_PIX_FMT_RGB555; |
| |
| mp->frame = av_frame_alloc(); |
| if (!mp->frame) { |
| mp_decode_end(avctx); |
| return AVERROR(ENOMEM); |
| } |
| |
| return 0; |
| } |
| |
| static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, 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; |
| if (read_color) |
| color = get_bits(gb, 15); |
| x = offset % mp->avctx->width; |
| y = offset / mp->avctx->width; |
| if (y >= mp->avctx->height) |
| continue; |
| w = FFMIN(w, mp->avctx->width - x); |
| h = FFMIN(h, mp->avctx->height - y); |
| pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2]; |
| while (h--) { |
| mp->changes_map[offset] = w; |
| if (read_color) |
| for (i = 0; i < w; ++i) |
| pixels[i] = color; |
| offset += mp->avctx->width; |
| pixels += mp->frame->linesize[0] / 2; |
| } |
| } |
| } |
| |
| static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code) |
| { |
| while (get_bits1(gb)) { |
| ++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 AVERROR_INVALIDDATA; |
| } |
| code <<= 1; |
| if (mp_get_code(mp, gb, size, code + 1) < 0) |
| return AVERROR_INVALIDDATA; |
| } |
| if (mp->current_codes_count >= MAX_HUFF_CODES) { |
| av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| mp->codes[mp->current_codes_count ].code = code; |
| mp->codes[mp->current_codes_count++].size = size; |
| return 0; |
| } |
| |
| static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb) |
| { |
| if (mp->codes_count == 1) { |
| mp->codes[0].delta = get_bits(gb, 4); |
| } else { |
| int i; |
| int ret; |
| |
| mp->max_codes_bits = get_bits(gb, 4); |
| for (i = 0; i < mp->codes_count; ++i) |
| mp->codes[i].delta = get_bits(gb, 4); |
| mp->current_codes_count = 0; |
| if ((ret = mp_get_code(mp, gb, 0, 0)) < 0) |
| return ret; |
| if (mp->current_codes_count < mp->codes_count) { |
| av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| return 0; |
| } |
| |
| static int mp_gradient(MotionPixelsContext *mp, int component, int v) |
| { |
| int delta; |
| |
| delta = (v - 7) * mp->gradient_scale[component]; |
| mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1; |
| return delta; |
| } |
| |
| static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y) |
| { |
| int color; |
| |
| color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2]; |
| return mp_rgb_yuv_table[color]; |
| } |
| |
| static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p) |
| { |
| int color; |
| |
| color = mp_yuv_to_rgb(p->y, p->v, p->u, 1); |
| *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color; |
| } |
| |
| static int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb) |
| { |
| int i; |
| |
| i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1); |
| return mp->codes[i].delta; |
| } |
| |
| static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y) |
| { |
| YuvPixel p; |
| const int y0 = y * mp->avctx->width; |
| int w, i, x = 0; |
| |
| p = mp->vpt[y]; |
| if (mp->changes_map[y0 + x] == 0) { |
| memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale)); |
| ++x; |
| } |
| while (x < mp->avctx->width) { |
| w = mp->changes_map[y0 + x]; |
| if (w != 0) { |
| if ((y & 3) == 0) { |
| if (mp->changes_map[y0 + x + mp->avctx->width] < w || |
| mp->changes_map[y0 + x + mp->avctx->width * 2] < w || |
| mp->changes_map[y0 + x + mp->avctx->width * 3] < w) { |
| for (i = (x + 3) & ~3; i < x + w; i += 4) { |
| mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y); |
| } |
| } |
| } |
| x += w; |
| 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 = 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 = av_clip_intp2(p.v, 5); |
| p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); |
| p.u = av_clip_intp2(p.u, 5); |
| mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p; |
| } else { |
| p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v; |
| p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u; |
| } |
| } |
| mp_set_rgb_from_yuv(mp, x, y, &p); |
| ++x; |
| } |
| } |
| } |
| |
| static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb) |
| { |
| YuvPixel p; |
| int y, y0; |
| |
| av_assert1(mp->changes_map[0]); |
| |
| for (y = 0; y < mp->avctx->height; ++y) { |
| if (mp->changes_map[y * mp->avctx->width] != 0) { |
| 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 = av_clip_uintp2(p.y, 5); |
| if ((y & 3) == 0) { |
| p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); |
| p.v = av_clip_intp2(p.v, 5); |
| p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); |
| p.u = av_clip_intp2(p.u, 5); |
| } |
| mp->vpt[y] = p; |
| mp_set_rgb_from_yuv(mp, 0, y, &p); |
| } |
| } |
| for (y0 = 0; y0 < 2; ++y0) |
| for (y = y0; y < mp->avctx->height; y += 2) |
| mp_decode_line(mp, gb, y); |
| } |
| |
| static int mp_decode_frame(AVCodecContext *avctx, |
| void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| MotionPixelsContext *mp = avctx->priv_data; |
| GetBitContext gb; |
| int i, count1, count2, sz, ret; |
| |
| if ((ret = ff_reget_buffer(avctx, mp->frame)) < 0) |
| return ret; |
| |
| /* le32 bitstream msb first */ |
| av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size); |
| if (!mp->bswapbuf) |
| return AVERROR(ENOMEM); |
| mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf, |
| buf_size / 4); |
| if (buf_size & 3) |
| memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3); |
| init_get_bits(&gb, 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); |
| } |
| |
| mp->codes_count = get_bits(&gb, 4); |
| if (mp->codes_count == 0) |
| goto end; |
| |
| if (mp->changes_map[0] == 0) { |
| *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15); |
| mp->changes_map[0] = 1; |
| } |
| if (mp_read_codes_table(mp, &gb) < 0) |
| goto end; |
| |
| sz = get_bits(&gb, 18); |
| if (avctx->extradata[0] != 5) |
| sz += get_bits(&gb, 18); |
| if (sz == 0) |
| goto end; |
| |
| if (mp->max_codes_bits <= 0) |
| 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); |
| ff_free_vlc(&mp->vlc); |
| |
| end: |
| if ((ret = av_frame_ref(data, mp->frame)) < 0) |
| return ret; |
| *got_frame = 1; |
| return buf_size; |
| } |
| |
| AVCodec ff_motionpixels_decoder = { |
| .name = "motionpixels", |
| .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_MOTIONPIXELS, |
| .priv_data_size = sizeof(MotionPixelsContext), |
| .init = mp_decode_init, |
| .close = mp_decode_end, |
| .decode = mp_decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1, |
| }; |
