diff options
Diffstat (limited to 'ffmpeg/libavcodec/motionpixels.c')
| -rw-r--r-- | ffmpeg/libavcodec/motionpixels.c | 343 |
1 files changed, 343 insertions, 0 deletions
diff --git a/ffmpeg/libavcodec/motionpixels.c b/ffmpeg/libavcodec/motionpixels.c new file mode 100644 index 0000000..00c1148 --- /dev/null +++ b/ffmpeg/libavcodec/motionpixels.c @@ -0,0 +1,343 @@ +/* + * 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 "dsputil.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; + DSPContext dsp; + 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_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_dsputil_init(&mp->dsp, avctx); + mp->changes_map = av_mallocz(avctx->width * h4); + mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1; + mp->vpt = av_mallocz(avctx->height * sizeof(YuvPixel)); + mp->hpt = av_mallocz(h4 * w4 / 16 * sizeof(YuvPixel)); + avctx->pix_fmt = AV_PIX_FMT_RGB555; + avcodec_get_frame_defaults(&mp->frame); + 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(p.y, 0, 31); + if ((x & 3) == 0) { + if ((y & 3) == 0) { + p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); + p.v = av_clip(p.v, -32, 31); + p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); + p.u = av_clip(p.u, -32, 31); + 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(p.y, 0, 31); + if ((y & 3) == 0) { + p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb)); + p.v = av_clip(p.v, -32, 31); + p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb)); + p.u = av_clip(p.u, -32, 31); + } + 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_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!mp->bswapbuf) + return AVERROR(ENOMEM); + mp->dsp.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); + memset(mp->bswapbuf + buf_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); + 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; +} + +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_unref(&mp->frame); + + return 0; +} + +AVCodec ff_motionpixels_decoder = { + .name = "motionpixels", + .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 = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"), +}; |