mirror of https://github.com/FFmpeg/FFmpeg.git
Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/235/head^2
Paul B Mahol
9 years ago
parent
aa40df483b
commit
c85d04251d
8 changed files with 233 additions and 1 deletions
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/*
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* Duck TrueMotion 2.0 Real Time Decoder |
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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 <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "avcodec.h" |
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#define BITSTREAM_READER_LE |
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#include "get_bits.h" |
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#include "internal.h" |
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#include "libavutil/imgutils.h" |
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#include "libavutil/internal.h" |
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#include "libavutil/intreadwrite.h" |
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#include "libavutil/mem.h" |
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typedef struct TrueMotion2RTContext { |
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GetBitContext gb; |
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const uint8_t *buf; |
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int size; |
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int delta_size; |
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int hscale; |
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} TrueMotion2RTContext; |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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avctx->pix_fmt = AV_PIX_FMT_YUV410P; |
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return 0; |
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} |
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/* Returns the number of bytes consumed from the bytestream. Returns -1 if
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* there was an error while decoding the header */ |
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static int truemotion2rt_decode_header(AVCodecContext *avctx) |
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{ |
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TrueMotion2RTContext *s = avctx->priv_data; |
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uint8_t header_buffer[128] = { 0 }; /* logical maximum size of the header */ |
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int i, header_size; |
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header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f; |
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if (header_size < 10) { |
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av_log(avctx, AV_LOG_ERROR, "invalid header size (%d)\n", header_size); |
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return AVERROR_INVALIDDATA; |
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} |
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if (header_size + 1 > s->size) { |
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av_log(avctx, AV_LOG_ERROR, "Input packet too small.\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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/* unscramble the header bytes with a XOR operation */ |
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for (i = 1; i < header_size; i++) |
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header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1]; |
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s->delta_size = header_buffer[1]; |
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s->hscale = 1 + !!header_buffer[3]; |
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if (s->delta_size < 2 || s->delta_size > 4) |
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return AVERROR_INVALIDDATA; |
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avctx->height = AV_RL16(header_buffer + 5); |
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avctx->width = AV_RL16(header_buffer + 7); |
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return header_size; |
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} |
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static const int16_t delta_tab4[] = { |
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1, -1, 2, -3, 8, -8, 18, -18, 36, -36, 54, -54, 96, -96, 144, -144 |
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}; |
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static const int16_t delta_tab3[] = { |
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2, -3, 8, -8, 18, -18, 36, -36 |
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}; |
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static const int16_t delta_tab2[] = { |
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5, -7, 36, -36 |
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}; |
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static const int16_t *const delta_tabs[] = { |
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delta_tab2, delta_tab3, delta_tab4, |
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}; |
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static int decode_frame(AVCodecContext *avctx, |
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void *data, int *got_frame, |
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AVPacket *avpkt) |
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{ |
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TrueMotion2RTContext *s = avctx->priv_data; |
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const uint8_t *buf = avpkt->data; |
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int ret, buf_size = avpkt->size; |
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AVFrame * const p = data; |
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GetBitContext *gb = &s->gb; |
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uint8_t *dst; |
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int x, y, delta_mode; |
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s->buf = buf; |
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s->size = buf_size; |
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if ((ret = truemotion2rt_decode_header(avctx)) < 0) |
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return ret; |
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if ((ret = init_get_bits8(gb, buf + ret, buf_size - ret)) < 0) |
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return ret; |
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0) |
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return ret; |
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skip_bits(gb, 32); |
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delta_mode = s->delta_size - 2; |
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dst = p->data[0]; |
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for (y = 0; y < avctx->height; y++) { |
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int diff = 0; |
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for (x = 0; x < avctx->width; x += s->hscale) { |
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diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; |
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dst[x] = av_clip_uint8((y ? dst[x - p->linesize[0]] : 0) + diff); |
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} |
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dst += p->linesize[0]; |
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} |
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if (s->hscale > 1) { |
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dst = p->data[0]; |
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for (y = 0; y < avctx->height; y++) { |
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for (x = 1; x < avctx->width; x += s->hscale) { |
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dst[x] = dst[x - 1]; |
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} |
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dst += p->linesize[0]; |
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} |
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} |
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dst = p->data[0]; |
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for (y = 0; y < avctx->height; y++) { |
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for (x = 0; x < avctx->width; x++) |
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dst[x] = av_clip_uint8(dst[x] + (dst[x] - 128) / 3); |
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dst += p->linesize[0]; |
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} |
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dst = p->data[1]; |
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for (y = 0; y < avctx->height >> 2; y++) { |
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int diff = 0; |
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for (x = 0; x < avctx->width >> 2; x += s->hscale) { |
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diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; |
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dst[x] = av_clip_uint8((y ? dst[x - p->linesize[1]] : 128) + diff); |
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} |
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dst += p->linesize[1]; |
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} |
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if (s->hscale > 1) { |
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dst = p->data[1]; |
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for (y = 0; y < avctx->height >> 2; y++) { |
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for (x = 1; x < avctx->width >> 2; x += s->hscale) { |
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dst[x] = dst[x - 1]; |
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} |
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dst += p->linesize[1]; |
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} |
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} |
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dst = p->data[1]; |
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for (y = 0; y < avctx->height >> 2; y++) { |
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for (x = 0; x < avctx->width >> 2; x++) |
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dst[x] += (dst[x] - 128) / 8; |
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dst += p->linesize[1]; |
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} |
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dst = p->data[2]; |
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for (y = 0; y < avctx->height >> 2; y++) { |
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int diff = 0; |
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for (x = 0; x < avctx->width >> 2; x += s->hscale) { |
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diff += delta_tabs[delta_mode][get_bits(gb, s->delta_size)]; |
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dst[x] = av_clip_uint8((y ? dst[x - p->linesize[2]] : 128) + diff); |
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} |
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dst += p->linesize[2]; |
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} |
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if (s->hscale > 1) { |
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dst = p->data[2]; |
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for (y = 0; y < avctx->height >> 2; y++) { |
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for (x = 1; x < avctx->width >> 2; x += s->hscale) { |
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dst[x] = dst[x - 1]; |
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} |
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dst += p->linesize[2]; |
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} |
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} |
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dst = p->data[2]; |
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for (y = 0; y < avctx->height >> 2; y++) { |
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for (x = 0; x < avctx->width >> 2; x++) |
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dst[x] += (dst[x] - 128) / 8; |
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dst += p->linesize[2]; |
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} |
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p->pict_type = AV_PICTURE_TYPE_I; |
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*got_frame = 1; |
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return buf_size; |
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} |
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AVCodec ff_truemotion2rt_decoder = { |
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.name = "truemotion2rt", |
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.long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0 Real Time"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_TRUEMOTION2RT, |
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.priv_data_size = sizeof(TrueMotion2RTContext), |
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.init = decode_init, |
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.decode = decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |
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