From 350914fc8024612f614c0a4f5c8ba5da2d9988e7 Mon Sep 17 00:00:00 2001 From: Eli Friedman Date: Fri, 16 Dec 2011 21:30:27 +0100 Subject: Escape 130 (RPL) decoder Some fixes provided by Paul B Mahol and Michael Niedermayer and me. Signed-off-by: Diego Biurrun Signed-off-by: Kostya Shishkov --- libavcodec/escape130.c | 356 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 356 insertions(+) create mode 100644 libavcodec/escape130.c (limited to 'libavcodec/escape130.c') diff --git a/libavcodec/escape130.c b/libavcodec/escape130.c new file mode 100644 index 0000000000..3e3f7e1565 --- /dev/null +++ b/libavcodec/escape130.c @@ -0,0 +1,356 @@ +/* + * Escape 130 video decoder + * Copyright (C) 2008 Eli Friedman (eli.friedman gmail.com) + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "libavutil/attributes.h" +#include "libavutil/mem.h" +#include "avcodec.h" +#define BITSTREAM_READER_LE +#include "get_bits.h" +#include "internal.h" + +typedef struct Escape130Context { + uint8_t *old_y_avg; + + uint8_t *new_y, *old_y; + uint8_t *new_u, *old_u; + uint8_t *new_v, *old_v; + + uint8_t *buf1, *buf2; + int linesize[3]; +} Escape130Context; + +static const uint8_t offset_table[] = { 2, 4, 10, 20 }; +static const int8_t sign_table[64][4] = { + { 0, 0, 0, 0 }, + { -1, 1, 0, 0 }, + { 1, -1, 0, 0 }, + { -1, 0, 1, 0 }, + { -1, 1, 1, 0 }, + { 0, -1, 1, 0 }, + { 1, -1, 1, 0 }, + { -1, -1, 1, 0 }, + { 1, 0, -1, 0 }, + { 0, 1, -1, 0 }, + { 1, 1, -1, 0 }, + { -1, 1, -1, 0 }, + { 1, -1, -1, 0 }, + { -1, 0, 0, 1 }, + { -1, 1, 0, 1 }, + { 0, -1, 0, 1 }, + + { 0, 0, 0, 0 }, + { 1, -1, 0, 1 }, + { -1, -1, 0, 1 }, + { -1, 0, 1, 1 }, + { -1, 1, 1, 1 }, + { 0, -1, 1, 1 }, + { 1, -1, 1, 1 }, + { -1, -1, 1, 1 }, + { 0, 0, -1, 1 }, + { 1, 0, -1, 1 }, + { -1, 0, -1, 1 }, + { 0, 1, -1, 1 }, + { 1, 1, -1, 1 }, + { -1, 1, -1, 1 }, + { 0, -1, -1, 1 }, + { 1, -1, -1, 1 }, + + { 0, 0, 0, 0 }, + { -1, -1, -1, 1 }, + { 1, 0, 0, -1 }, + { 0, 1, 0, -1 }, + { 1, 1, 0, -1 }, + { -1, 1, 0, -1 }, + { 1, -1, 0, -1 }, + { 0, 0, 1, -1 }, + { 1, 0, 1, -1 }, + { -1, 0, 1, -1 }, + { 0, 1, 1, -1 }, + { 1, 1, 1, -1 }, + { -1, 1, 1, -1 }, + { 0, -1, 1, -1 }, + { 1, -1, 1, -1 }, + { -1, -1, 1, -1 }, + + { 0, 0, 0, 0 }, + { 1, 0, -1, -1 }, + { 0, 1, -1, -1 }, + { 1, 1, -1, -1 }, + { -1, 1, -1, -1 }, + { 1, -1, -1, -1 } +}; + +static const int8_t luma_adjust[] = { -4, -3, -2, -1, 1, 2, 3, 4 }; + +static const int8_t chroma_adjust[2][8] = { + { 1, 1, 0, -1, -1, -1, 0, 1 }, + { 0, 1, 1, 1, 0, -1, -1, -1 } +}; + +const uint8_t chroma_vals[] = { + 20, 28, 36, 44, 52, 60, 68, 76, + 84, 92, 100, 106, 112, 116, 120, 124, + 128, 132, 136, 140, 144, 150, 156, 164, + 172, 180, 188, 196, 204, 212, 220, 228 +}; + +static av_cold int escape130_decode_init(AVCodecContext *avctx) +{ + Escape130Context *s = avctx->priv_data; + avctx->pix_fmt = PIX_FMT_YUV420P; + + if ((avctx->width & 1) || (avctx->height & 1)) { + av_log(avctx, AV_LOG_ERROR, + "Dimensions should be a multiple of two.\n"); + return AVERROR_INVALIDDATA; + } + + s->old_y_avg = av_malloc(avctx->width * avctx->height / 4); + s->buf1 = av_malloc(avctx->width * avctx->height * 3 / 2); + s->buf2 = av_malloc(avctx->width * avctx->height * 3 / 2); + if (!s->old_y_avg || !s->buf1 || !s->buf2) { + av_freep(&s->old_y_avg); + av_freep(&s->buf1); + av_freep(&s->buf2); + av_log(avctx, AV_LOG_ERROR, "Could not allocate buffer.\n"); + return AVERROR(ENOMEM); + } + + s->linesize[0] = avctx->width; + s->linesize[1] = + s->linesize[2] = avctx->width / 2; + + s->new_y = s->buf1; + s->new_u = s->new_y + avctx->width * avctx->height; + s->new_v = s->new_u + avctx->width * avctx->height / 4; + s->old_y = s->buf2; + s->old_u = s->old_y + avctx->width * avctx->height; + s->old_v = s->old_u + avctx->width * avctx->height / 4; + memset(s->old_y, 0, avctx->width * avctx->height); + memset(s->old_u, 0x10, avctx->width * avctx->height / 4); + memset(s->old_v, 0x10, avctx->width * avctx->height / 4); + + return 0; +} + +static av_cold int escape130_decode_close(AVCodecContext *avctx) +{ + Escape130Context *s = avctx->priv_data; + + av_freep(&s->old_y_avg); + av_freep(&s->buf1); + av_freep(&s->buf2); + + return 0; +} + +static int decode_skip_count(GetBitContext* gb) +{ + int value; + + value = get_bits1(gb); + if (value) + return 0; + + value = get_bits(gb, 3); + if (value) + return value; + + value = get_bits(gb, 8); + if (value) + return value + 7; + + value = get_bits(gb, 15); + if (value) + return value + 262; + + return -1; +} + +static int escape130_decode_frame(AVCodecContext *avctx, void *data, + int *got_frame, AVPacket *avpkt) +{ + const uint8_t *buf = avpkt->data; + int buf_size = avpkt->size; + Escape130Context *s = avctx->priv_data; + AVFrame *pic = data; + GetBitContext gb; + int ret; + + uint8_t *old_y, *old_cb, *old_cr, + *new_y, *new_cb, *new_cr; + uint8_t *dstY, *dstU, *dstV; + unsigned old_y_stride, old_cb_stride, old_cr_stride, + new_y_stride, new_cb_stride, new_cr_stride; + unsigned total_blocks = avctx->width * avctx->height / 4, + block_index, block_x = 0; + unsigned y[4] = { 0 }, cb = 0x10, cr = 0x10; + int skip = -1, y_avg = 0, i, j; + uint8_t *ya = s->old_y_avg; + + // first 16 bytes are header; no useful information in here + if (buf_size <= 16) { + av_log(avctx, AV_LOG_ERROR, "Insufficient frame data\n"); + return AVERROR_INVALIDDATA; + } + + if ((ret = ff_get_buffer(avctx, pic, 0)) < 0) + return ret; + + init_get_bits(&gb, buf + 16, (buf_size - 16) * 8); + + new_y = s->new_y; + new_cb = s->new_u; + new_cr = s->new_v; + new_y_stride = s->linesize[0]; + new_cb_stride = s->linesize[1]; + new_cr_stride = s->linesize[2]; + old_y = s->old_y; + old_cb = s->old_u; + old_cr = s->old_v; + old_y_stride = s->linesize[0]; + old_cb_stride = s->linesize[1]; + old_cr_stride = s->linesize[2]; + + for (block_index = 0; block_index < total_blocks; block_index++) { + // Note that this call will make us skip the rest of the blocks + // if the frame ends prematurely. + if (skip == -1) + skip = decode_skip_count(&gb); + if (skip == -1) { + av_log(avctx, AV_LOG_ERROR, "Error decoding skip value\n"); + return AVERROR_INVALIDDATA; + } + + if (skip) { + y[0] = old_y[0]; + y[1] = old_y[1]; + y[2] = old_y[old_y_stride]; + y[3] = old_y[old_y_stride + 1]; + y_avg = ya[0]; + cb = old_cb[0]; + cr = old_cr[0]; + } else { + if (get_bits1(&gb)) { + unsigned sign_selector = get_bits(&gb, 6); + unsigned difference_selector = get_bits(&gb, 2); + y_avg = 2 * get_bits(&gb, 5); + for (i = 0; i < 4; i++) { + y[i] = av_clip(y_avg + offset_table[difference_selector] * + sign_table[sign_selector][i], 0, 63); + } + } else if (get_bits1(&gb)) { + if (get_bits1(&gb)) { + y_avg = get_bits(&gb, 6); + } else { + unsigned adjust_index = get_bits(&gb, 3); + y_avg = (y_avg + luma_adjust[adjust_index]) & 63; + } + for (i = 0; i < 4; i++) + y[i] = y_avg; + } + + if (get_bits1(&gb)) { + if (get_bits1(&gb)) { + cb = get_bits(&gb, 5); + cr = get_bits(&gb, 5); + } else { + unsigned adjust_index = get_bits(&gb, 3); + cb = (cb + chroma_adjust[0][adjust_index]) & 31; + cr = (cr + chroma_adjust[1][adjust_index]) & 31; + } + } + } + *ya++ = y_avg; + + new_y[0] = y[0]; + new_y[1] = y[1]; + new_y[new_y_stride] = y[2]; + new_y[new_y_stride + 1] = y[3]; + *new_cb = cb; + *new_cr = cr; + + old_y += 2; + old_cb++; + old_cr++; + new_y += 2; + new_cb++; + new_cr++; + block_x++; + if (block_x * 2 == avctx->width) { + block_x = 0; + old_y += old_y_stride * 2 - avctx->width; + old_cb += old_cb_stride - avctx->width / 2; + old_cr += old_cr_stride - avctx->width / 2; + new_y += new_y_stride * 2 - avctx->width; + new_cb += new_cb_stride - avctx->width / 2; + new_cr += new_cr_stride - avctx->width / 2; + } + + skip--; + } + + new_y = s->new_y; + new_cb = s->new_u; + new_cr = s->new_v; + dstY = pic->data[0]; + dstU = pic->data[1]; + dstV = pic->data[2]; + for (j = 0; j < avctx->height; j++) { + for (i = 0; i < avctx->width; i++) + dstY[i] = new_y[i] << 2; + dstY += pic->linesize[0]; + new_y += new_y_stride; + } + for (j = 0; j < avctx->height / 2; j++) { + for (i = 0; i < avctx->width / 2; i++) { + dstU[i] = chroma_vals[new_cb[i]]; + dstV[i] = chroma_vals[new_cr[i]]; + } + dstU += pic->linesize[1]; + dstV += pic->linesize[2]; + new_cb += new_cb_stride; + new_cr += new_cr_stride; + } + + av_dlog(avctx, "Frame data: provided %d bytes, used %d bytes\n", + buf_size, get_bits_count(&gb) >> 3); + + FFSWAP(uint8_t*, s->old_y, s->new_y); + FFSWAP(uint8_t*, s->old_u, s->new_u); + FFSWAP(uint8_t*, s->old_v, s->new_v); + + *got_frame = 1; + + return buf_size; +} + +AVCodec ff_escape130_decoder = { + .name = "escape130", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_ESCAPE130, + .priv_data_size = sizeof(Escape130Context), + .init = escape130_decode_init, + .close = escape130_decode_close, + .decode = escape130_decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Escape 130"), +}; -- cgit v1.2.3