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https://github.com/FFmpeg/FFmpeg.git
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1df0b06162
There is no point in populating NuvContext with another DSPContext. Also split static and dynamic initialization bits to avoid running the static initialization parts over and over.
336 lines
10 KiB
C
336 lines
10 KiB
C
/*
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* NuppelVideo decoder
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* Copyright (c) 2006 Reimar Doeffinger
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "libavutil/bswap.h"
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#include "libavutil/common.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/lzo.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "rtjpeg.h"
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typedef struct {
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AVFrame *pic;
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int codec_frameheader;
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int quality;
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int width, height;
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unsigned int decomp_size;
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unsigned char *decomp_buf;
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uint32_t lq[64], cq[64];
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RTJpegContext rtj;
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} NuvContext;
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static const uint8_t fallback_lquant[] = {
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16, 11, 10, 16, 24, 40, 51, 61,
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12, 12, 14, 19, 26, 58, 60, 55,
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14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62,
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18, 22, 37, 56, 68, 109, 103, 77,
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24, 35, 55, 64, 81, 104, 113, 92,
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49, 64, 78, 87, 103, 121, 120, 101,
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72, 92, 95, 98, 112, 100, 103, 99
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};
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static const uint8_t fallback_cquant[] = {
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17, 18, 24, 47, 99, 99, 99, 99,
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18, 21, 26, 66, 99, 99, 99, 99,
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24, 26, 56, 99, 99, 99, 99, 99,
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47, 66, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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};
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/**
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* @brief copy frame data from buffer to AVFrame, handling stride.
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* @param f destination AVFrame
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* @param src source buffer, does not use any line-stride
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* @param width width of the video frame
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* @param height height of the video frame
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*/
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static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
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{
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AVPicture pic;
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avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
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av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
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}
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/**
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* @brief extract quantization tables from codec data into our context
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*/
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static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
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int size)
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{
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int i;
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if (size < 2 * 64 * 4) {
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av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
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return AVERROR_INVALIDDATA;
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}
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for (i = 0; i < 64; i++, buf += 4)
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c->lq[i] = AV_RL32(buf);
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for (i = 0; i < 64; i++, buf += 4)
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c->cq[i] = AV_RL32(buf);
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return 0;
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}
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/**
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* @brief set quantization tables from a quality value
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*/
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static void get_quant_quality(NuvContext *c, int quality)
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{
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int i;
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quality = FFMAX(quality, 1);
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for (i = 0; i < 64; i++) {
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c->lq[i] = (fallback_lquant[i] << 7) / quality;
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c->cq[i] = (fallback_cquant[i] << 7) / quality;
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}
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}
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static int codec_reinit(AVCodecContext *avctx, int width, int height,
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int quality)
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{
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NuvContext *c = avctx->priv_data;
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int ret;
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width = FFALIGN(width, 2);
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height = FFALIGN(height, 2);
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if (quality >= 0)
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get_quant_quality(c, quality);
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if (width != c->width || height != c->height) {
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void *ptr;
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if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
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return ret;
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avctx->width = c->width = width;
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avctx->height = c->height = height;
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ptr = av_fast_realloc(c->decomp_buf, &c->decomp_size,
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c->height * c->width * 3 / 2 +
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FF_INPUT_BUFFER_PADDING_SIZE +
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RTJPEG_HEADER_SIZE);
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if (!ptr) {
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av_log(avctx, AV_LOG_ERROR,
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"Can't allocate decompression buffer.\n");
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return AVERROR(ENOMEM);
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} else
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c->decomp_buf = ptr;
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ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
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av_frame_unref(c->pic);
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} else if (quality != c->quality)
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ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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NuvContext *c = avctx->priv_data;
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AVFrame *picture = data;
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int orig_size = buf_size;
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int keyframe, ret;
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int result, init_frame = !avctx->frame_number;
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enum {
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NUV_UNCOMPRESSED = '0',
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NUV_RTJPEG = '1',
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NUV_RTJPEG_IN_LZO = '2',
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NUV_LZO = '3',
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NUV_BLACK = 'N',
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NUV_COPY_LAST = 'L'
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} comptype;
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if (buf_size < 12) {
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av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
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return AVERROR_INVALIDDATA;
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}
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// codec data (rtjpeg quant tables)
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if (buf[0] == 'D' && buf[1] == 'R') {
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int ret;
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// skip rest of the frameheader.
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buf = &buf[12];
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buf_size -= 12;
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ret = get_quant(avctx, c, buf, buf_size);
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if (ret < 0)
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return ret;
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ff_rtjpeg_decode_init(&c->rtj, c->width, c->height, c->lq, c->cq);
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return orig_size;
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}
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if (buf[0] != 'V' || buf_size < 12) {
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av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
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return AVERROR_INVALIDDATA;
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}
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comptype = buf[1];
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switch (comptype) {
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case NUV_RTJPEG_IN_LZO:
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case NUV_RTJPEG:
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keyframe = !buf[2];
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break;
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case NUV_COPY_LAST:
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keyframe = 0;
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break;
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default:
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keyframe = 1;
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break;
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}
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// skip rest of the frameheader.
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buf = &buf[12];
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buf_size -= 12;
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if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
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int outlen = c->decomp_size - FF_INPUT_BUFFER_PADDING_SIZE;
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int inlen = buf_size;
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if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen)) {
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av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
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return AVERROR_INVALIDDATA;
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}
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buf = c->decomp_buf;
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buf_size = outlen;
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}
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if (c->codec_frameheader) {
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int w, h, q;
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if (buf_size < RTJPEG_HEADER_SIZE || buf[4] != RTJPEG_HEADER_SIZE ||
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buf[5] != RTJPEG_FILE_VERSION) {
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av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n");
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return AVERROR_INVALIDDATA;
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}
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w = AV_RL16(&buf[6]);
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h = AV_RL16(&buf[8]);
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q = buf[10];
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if ((result = codec_reinit(avctx, w, h, q)) < 0)
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return result;
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if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO)
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buf = c->decomp_buf;
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buf = &buf[RTJPEG_HEADER_SIZE];
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buf_size -= RTJPEG_HEADER_SIZE;
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}
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if (keyframe) {
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av_frame_unref(c->pic);
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init_frame = 1;
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}
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result = ff_reget_buffer(avctx, c->pic);
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if (result < 0) {
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
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return result;
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}
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if (init_frame) {
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memset(c->pic->data[0], 0, avctx->height * c->pic->linesize[0]);
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memset(c->pic->data[1], 0x80, avctx->height * c->pic->linesize[1] / 2);
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memset(c->pic->data[2], 0x80, avctx->height * c->pic->linesize[2] / 2);
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}
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c->pic->pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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c->pic->key_frame = keyframe;
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// decompress/copy/whatever data
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switch (comptype) {
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case NUV_LZO:
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case NUV_UNCOMPRESSED: {
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int height = c->height;
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if (buf_size < c->width * height * 3 / 2) {
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av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
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height = buf_size / c->width / 3 * 2;
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}
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copy_frame(c->pic, buf, c->width, height);
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break;
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}
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case NUV_RTJPEG_IN_LZO:
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case NUV_RTJPEG:
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ret = ff_rtjpeg_decode_frame_yuv420(&c->rtj, c->pic, buf, buf_size);
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if (ret < 0)
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return ret;
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break;
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case NUV_BLACK:
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memset(c->pic->data[0], 0, c->width * c->height);
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memset(c->pic->data[1], 128, c->width * c->height / 4);
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memset(c->pic->data[2], 128, c->width * c->height / 4);
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break;
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case NUV_COPY_LAST:
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/* nothing more to do here */
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
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return AVERROR_INVALIDDATA;
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}
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if ((result = av_frame_ref(picture, c->pic)) < 0)
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return result;
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*got_frame = 1;
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return orig_size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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NuvContext *c = avctx->priv_data;
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int ret;
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c->pic = av_frame_alloc();
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if (!c->pic)
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return AVERROR(ENOMEM);
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avctx->pix_fmt = AV_PIX_FMT_YUV420P;
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c->decomp_buf = NULL;
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c->quality = -1;
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c->width = 0;
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c->height = 0;
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c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
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if (avctx->extradata_size)
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get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
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ff_rtjpeg_init(&c->rtj, avctx);
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if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
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return ret;
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return 0;
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}
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static av_cold int decode_end(AVCodecContext *avctx)
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{
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NuvContext *c = avctx->priv_data;
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av_freep(&c->decomp_buf);
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av_frame_free(&c->pic);
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return 0;
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}
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AVCodec ff_nuv_decoder = {
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.name = "nuv",
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.long_name = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_NUV,
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.priv_data_size = sizeof(NuvContext),
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.init = decode_init,
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.close = decode_end,
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.decode = decode_frame,
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.capabilities = CODEC_CAP_DR1,
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};
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