/* * NuppelVideo decoder * Copyright (c) 2006 Reimar Doeffinger * * 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 <stdio.h> #include <stdlib.h> #include "libavutil/bswap.h" #include "libavutil/lzo.h" #include "libavutil/imgutils.h" #include "avcodec.h" #include "dsputil.h" #include "rtjpeg.h" typedef struct { AVFrame pic; int codec_frameheader; int quality; int width, height; unsigned int decomp_size; unsigned char* decomp_buf; uint32_t lq[64], cq[64]; RTJpegContext rtj; DSPContext dsp; } NuvContext; static const uint8_t fallback_lquant[] = { 16, 11, 10, 16, 24, 40, 51, 61, 12, 12, 14, 19, 26, 58, 60, 55, 14, 13, 16, 24, 40, 57, 69, 56, 14, 17, 22, 29, 51, 87, 80, 62, 18, 22, 37, 56, 68, 109, 103, 77, 24, 35, 55, 64, 81, 104, 113, 92, 49, 64, 78, 87, 103, 121, 120, 101, 72, 92, 95, 98, 112, 100, 103, 99 }; static const uint8_t fallback_cquant[] = { 17, 18, 24, 47, 99, 99, 99, 99, 18, 21, 26, 66, 99, 99, 99, 99, 24, 26, 56, 99, 99, 99, 99, 99, 47, 66, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99 }; /** * @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, const uint8_t *src, int width, int height) { AVPicture pic; avpicture_fill(&pic, src, PIX_FMT_YUV420P, width, height); av_picture_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, const 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] = AV_RL32(buf); for (i = 0; i < 64; i++, buf += 4) c->cq[i] = AV_RL32(buf); return 0; } /** * @brief set quantization tables from a quality value */ static void get_quant_quality(NuvContext *c, int quality) { int i; quality = FFMAX(quality, 1); for (i = 0; i < 64; i++) { c->lq[i] = (fallback_lquant[i] << 7) / quality; c->cq[i] = (fallback_cquant[i] << 7) / quality; } } static int codec_reinit(AVCodecContext *avctx, int width, int height, int quality) { NuvContext *c = avctx->priv_data; width = FFALIGN(width, 2); height = FFALIGN(height, 2); if (quality >= 0) get_quant_quality(c, quality); if (width != c->width || height != c->height) { if (av_image_check_size(height, width, 0, avctx) < 0) return 0; avctx->width = c->width = width; avctx->height = c->height = height; av_fast_malloc(&c->decomp_buf, &c->decomp_size, c->height * c->width * 3 / 2); if (!c->decomp_buf) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return 0; } ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); } else if (quality != c->quality) ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); return 1; } static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; NuvContext *c = avctx->priv_data; AVFrame *picture = data; int orig_size = buf_size; int keyframe; int result; 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; } // 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; ff_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]; switch (comptype) { case NUV_RTJPEG_IN_LZO: case NUV_RTJPEG: keyframe = !buf[2]; break; case NUV_COPY_LAST: keyframe = 0; break; default: keyframe = 1; break; } // skip rest of the frameheader. buf = &buf[12]; buf_size -= 12; if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) { int outlen = c->decomp_size, inlen = buf_size; if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n"); buf = c->decomp_buf; buf_size = c->decomp_size; } if (c->codec_frameheader) { int w, h, q; if (buf[0] != 'V' || buf_size < 12) { av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame (wrong codec_tag?)\n"); return AVERROR_INVALIDDATA; } w = AV_RL16(&buf[6]); h = AV_RL16(&buf[8]); q = buf[10]; if (!codec_reinit(avctx, w, h, q)) return -1; buf = &buf[12]; buf_size -= 12; } if (keyframe && c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); c->pic.reference = 3; c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; result = avctx->reget_buffer(avctx, &c->pic); if (result < 0) { av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; c->pic.key_frame = keyframe; // decompress/copy/whatever data switch (comptype) { case NUV_LZO: 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_IN_LZO: case NUV_RTJPEG: { ff_rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size); 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: { /* 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 av_cold int decode_init(AVCodecContext *avctx) { NuvContext *c = avctx->priv_data; avctx->pix_fmt = PIX_FMT_YUV420P; c->pic.data[0] = NULL; c->decomp_buf = NULL; c->quality = -1; c->width = 0; c->height = 0; c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G'); if (avctx->extradata_size) get_quant(avctx, c, avctx->extradata, avctx->extradata_size); ff_dsputil_init(&c->dsp, avctx); if (!codec_reinit(avctx, avctx->width, avctx->height, -1)) return 1; return 0; } static av_cold int decode_end(AVCodecContext *avctx) { NuvContext *c = avctx->priv_data; av_freep(&c->decomp_buf); if (c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); return 0; } AVCodec ff_nuv_decoder = { .name = "nuv", .type = AVMEDIA_TYPE_VIDEO, .id = CODEC_ID_NUV, .priv_data_size = sizeof(NuvContext), .init = decode_init, .close = decode_end, .decode = decode_frame, .capabilities = CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"), };