/* * 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 <limits.h> #include "libavutil/bswap.h" #include "libavutil/common.h" #include "libavutil/lzo.h" #include "libavutil/imgutils.h" #include "avcodec.h" #include "internal.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, AV_PIX_FMT_YUV420P, width, height); av_picture_copy((AVPicture *)f, &pic, AV_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 AVERROR_INVALIDDATA; } 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; int ret; width = FFALIGN(width, 2); height = FFALIGN(height, 2); if (quality >= 0) get_quant_quality(c, quality); if (width != c->width || height != c->height) { // also reserve space for a possible additional header int buf_size = 24 + height * width * 3 / 2 + AV_LZO_OUTPUT_PADDING; if (buf_size > INT_MAX/8) return -1; if ((ret = av_image_check_size(height, width, 0, avctx)) < 0) return ret; avctx->width = c->width = width; avctx->height = c->height = height; av_fast_malloc(&c->decomp_buf, &c->decomp_size, buf_size); if (!c->decomp_buf) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return AVERROR(ENOMEM); } ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); return 1; } else if (quality != c->quality) ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); return 0; } static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, 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 size_change = 0; int result, init_frame = !avctx->frame_number; 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 AVERROR_INVALIDDATA; } // 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_size < 12 || buf[0] != 'V') { av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n"); return AVERROR_INVALIDDATA; } 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; } retry: // 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 - AV_LZO_OUTPUT_PADDING, 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 - AV_LZO_OUTPUT_PADDING - outlen; } if (c->codec_frameheader) { int w, h, q; if (buf_size < RTJPEG_HEADER_SIZE) { av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n"); return AVERROR_INVALIDDATA; } // There seem to exist two variants of this header: one starts with 'V' // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size, // 1 byte header size (== 12), 1 byte version (== 0) if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) { av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n"); return AVERROR_INVALIDDATA; } w = AV_RL16(&buf[6]); h = AV_RL16(&buf[8]); q = buf[10]; if ((result = codec_reinit(avctx, w, h, q)) < 0) return result; if (result) { buf = avpkt->data; buf_size = avpkt->size; size_change = 1; goto retry; } buf = &buf[RTJPEG_HEADER_SIZE]; buf_size -= RTJPEG_HEADER_SIZE; } if (size_change || keyframe) { av_frame_unref(&c->pic); init_frame = 1; } if ((result = ff_reget_buffer(avctx, &c->pic)) < 0) return result; if (init_frame) { memset(c->pic.data[0], 0, avctx->height * c->pic.linesize[0]); memset(c->pic.data[1], 0x80, avctx->height * c->pic.linesize[1] / 2); memset(c->pic.data[2], 0x80, avctx->height * c->pic.linesize[2] / 2); } 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; } if(height > 0) 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 AVERROR_INVALIDDATA; } if ((result = av_frame_ref(picture, &c->pic)) < 0) return result; *got_frame = 1; return orig_size; } static av_cold int decode_init(AVCodecContext *avctx) { NuvContext *c = avctx->priv_data; int ret; avctx->pix_fmt = AV_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 ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0) return ret; return 0; } static av_cold int decode_end(AVCodecContext *avctx) { NuvContext *c = avctx->priv_data; av_freep(&c->decomp_buf); av_frame_unref(&c->pic); return 0; } AVCodec ff_nuv_decoder = { .name = "nuv", .type = AVMEDIA_TYPE_VIDEO, .id = AV_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"), };