/* * NuppelVideo decoder * Copyright (c) 2006 Reimar Doeffinger * * 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 <stdio.h> #include <stdlib.h> #include "common.h" #include "avcodec.h" #include "bswap.h" #include "dsputil.h" #include "lzo.h" #include "rtjpeg.h" typedef struct { AVFrame pic; int width, height; unsigned int decomp_size; unsigned char* decomp_buf; uint32_t lq[64], cq[64]; RTJpegContext rtj; DSPContext dsp; } NuvContext; /** * \brief copy frame data from buffer to AVFrame, handling stride. * \param f destination AVFrame * \param src source buffer, does not use any line-stride * \param width width of the video frame * \param height height of the video frame */ static void copy_frame(AVFrame *f, uint8_t *src, int width, int height) { AVPicture pic; avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height); img_copy((AVPicture *)f, &pic, PIX_FMT_YUV420P, width, height); } /** * \brief extract quantization tables from codec data into our context */ static int get_quant(AVCodecContext *avctx, NuvContext *c, uint8_t *buf, int size) { int i; if (size < 2 * 64 * 4) { av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n"); return -1; } for (i = 0; i < 64; i++, buf += 4) c->lq[i] = LE_32(buf); for (i = 0; i < 64; i++, buf += 4) c->cq[i] = LE_32(buf); return 0; } static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { NuvContext *c = (NuvContext *)avctx->priv_data; AVFrame *picture = data; int orig_size = buf_size; enum {NUV_UNCOMPRESSED = '0', NUV_RTJPEG = '1', NUV_RTJPEG_IN_LZO = '2', NUV_LZO = '3', NUV_BLACK = 'N', NUV_COPY_LAST = 'L'} comptype; if (buf_size < 12) { av_log(avctx, AV_LOG_ERROR, "coded frame too small\n"); return -1; } if (c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); c->pic.reference = 1; c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; if (avctx->get_buffer(avctx, &c->pic) < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } // codec data (rtjpeg quant tables) if (buf[0] == 'D' && buf[1] == 'R') { int ret; // skip rest of the frameheader. buf = &buf[12]; buf_size -= 12; ret = get_quant(avctx, c, buf, buf_size); if (ret < 0) return ret; rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); return orig_size; } if (buf[0] != 'V' || buf_size < 12) { av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n"); return -1; } comptype = buf[1]; // skip rest of the frameheader. buf = &buf[12]; buf_size -= 12; c->pic.pict_type = FF_I_TYPE; c->pic.key_frame = 1; // decompress/copy/whatever data switch (comptype) { case NUV_UNCOMPRESSED: { int height = c->height; if (buf_size < c->width * height * 3 / 2) { av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n"); height = buf_size / c->width / 3 * 2; } copy_frame(&c->pic, buf, c->width, height); break; } case NUV_RTJPEG: { rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size); break; } case NUV_RTJPEG_IN_LZO: { int outlen = c->decomp_size, inlen = buf_size; if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, c->decomp_buf, c->decomp_size); break; } case NUV_LZO: { int outlen = c->decomp_size, inlen = buf_size; if (lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); copy_frame(&c->pic, c->decomp_buf, c->width, c->height); break; } case NUV_BLACK: { memset(c->pic.data[0], 0, c->width * c->height); memset(c->pic.data[1], 128, c->width * c->height / 4); memset(c->pic.data[2], 128, c->width * c->height / 4); break; } case NUV_COPY_LAST: { c->pic.pict_type = FF_P_TYPE; c->pic.key_frame = 0; /* nothing more to do here */ break; } default: av_log(avctx, AV_LOG_ERROR, "unknown compression\n"); return -1; } *picture = c->pic; *data_size = sizeof(AVFrame); return orig_size; } static int decode_init(AVCodecContext *avctx) { NuvContext *c = (NuvContext *)avctx->priv_data; avctx->width = (avctx->width + 1) & ~1; avctx->height = (avctx->height + 1) & ~1; if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) { return 1; } avctx->has_b_frames = 0; avctx->pix_fmt = PIX_FMT_YUV420P; c->pic.data[0] = NULL; c->width = avctx->width; c->height = avctx->height; c->decomp_size = c->height * c->width * 3 / 2; c->decomp_buf = av_malloc(c->decomp_size + LZO_OUTPUT_PADDING); if (!c->decomp_buf) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return 1; } dsputil_init(&c->dsp, avctx); if (avctx->extradata_size) get_quant(avctx, c, avctx->extradata, avctx->extradata_size); rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); return 0; } static int decode_end(AVCodecContext *avctx) { NuvContext *c = (NuvContext *)avctx->priv_data; av_freep(&c->decomp_buf); if (c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); return 0; } AVCodec nuv_decoder = { "nuv", CODEC_TYPE_VIDEO, CODEC_ID_NUV, sizeof(NuvContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, };