yading@10: /*
yading@10:  * NuppelVideo decoder
yading@10:  * Copyright (c) 2006 Reimar Doeffinger
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include <stdio.h>
yading@10: #include <stdlib.h>
yading@10: #include <limits.h>
yading@10: 
yading@10: #include "libavutil/bswap.h"
yading@10: #include "libavutil/common.h"
yading@10: #include "libavutil/lzo.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "rtjpeg.h"
yading@10: 
yading@10: typedef struct {
yading@10:     AVFrame pic;
yading@10:     int codec_frameheader;
yading@10:     int quality;
yading@10:     int width, height;
yading@10:     unsigned int decomp_size;
yading@10:     unsigned char *decomp_buf;
yading@10:     uint32_t lq[64], cq[64];
yading@10:     RTJpegContext rtj;
yading@10:     DSPContext dsp;
yading@10: } NuvContext;
yading@10: 
yading@10: static const uint8_t fallback_lquant[] = {
yading@10:     16,  11,  10,  16,  24,  40,  51,  61,
yading@10:     12,  12,  14,  19,  26,  58,  60,  55,
yading@10:     14,  13,  16,  24,  40,  57,  69,  56,
yading@10:     14,  17,  22,  29,  51,  87,  80,  62,
yading@10:     18,  22,  37,  56,  68, 109, 103,  77,
yading@10:     24,  35,  55,  64,  81, 104, 113,  92,
yading@10:     49,  64,  78,  87, 103, 121, 120, 101,
yading@10:     72,  92,  95,  98, 112, 100, 103,  99
yading@10: };
yading@10: 
yading@10: static const uint8_t fallback_cquant[] = {
yading@10:     17, 18, 24, 47, 99, 99, 99, 99,
yading@10:     18, 21, 26, 66, 99, 99, 99, 99,
yading@10:     24, 26, 56, 99, 99, 99, 99, 99,
yading@10:     47, 66, 99, 99, 99, 99, 99, 99,
yading@10:     99, 99, 99, 99, 99, 99, 99, 99,
yading@10:     99, 99, 99, 99, 99, 99, 99, 99,
yading@10:     99, 99, 99, 99, 99, 99, 99, 99,
yading@10:     99, 99, 99, 99, 99, 99, 99, 99
yading@10: };
yading@10: 
yading@10: /**
yading@10:  * @brief copy frame data from buffer to AVFrame, handling stride.
yading@10:  * @param f destination AVFrame
yading@10:  * @param src source buffer, does not use any line-stride
yading@10:  * @param width width of the video frame
yading@10:  * @param height height of the video frame
yading@10:  */
yading@10: static void copy_frame(AVFrame *f, const uint8_t *src, int width, int height)
yading@10: {
yading@10:     AVPicture pic;
yading@10:     avpicture_fill(&pic, src, AV_PIX_FMT_YUV420P, width, height);
yading@10:     av_picture_copy((AVPicture *)f, &pic, AV_PIX_FMT_YUV420P, width, height);
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * @brief extract quantization tables from codec data into our context
yading@10:  */
yading@10: static int get_quant(AVCodecContext *avctx, NuvContext *c, const uint8_t *buf,
yading@10:                      int size)
yading@10: {
yading@10:     int i;
yading@10:     if (size < 2 * 64 * 4) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "insufficient rtjpeg quant data\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     for (i = 0; i < 64; i++, buf += 4)
yading@10:         c->lq[i] = AV_RL32(buf);
yading@10:     for (i = 0; i < 64; i++, buf += 4)
yading@10:         c->cq[i] = AV_RL32(buf);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * @brief set quantization tables from a quality value
yading@10:  */
yading@10: static void get_quant_quality(NuvContext *c, int quality)
yading@10: {
yading@10:     int i;
yading@10:     quality = FFMAX(quality, 1);
yading@10:     for (i = 0; i < 64; i++) {
yading@10:         c->lq[i] = (fallback_lquant[i] << 7) / quality;
yading@10:         c->cq[i] = (fallback_cquant[i] << 7) / quality;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int codec_reinit(AVCodecContext *avctx, int width, int height,
yading@10:                         int quality)
yading@10: {
yading@10:     NuvContext *c = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     width  = FFALIGN(width,  2);
yading@10:     height = FFALIGN(height, 2);
yading@10:     if (quality >= 0)
yading@10:         get_quant_quality(c, quality);
yading@10:     if (width != c->width || height != c->height) {
yading@10:         // also reserve space for a possible additional header
yading@10:         int buf_size = 24 + height * width * 3 / 2 + AV_LZO_OUTPUT_PADDING;
yading@10:         if (buf_size > INT_MAX/8)
yading@10:             return -1;
yading@10:         if ((ret = av_image_check_size(height, width, 0, avctx)) < 0)
yading@10:             return ret;
yading@10:         avctx->width  = c->width  = width;
yading@10:         avctx->height = c->height = height;
yading@10:         av_fast_malloc(&c->decomp_buf, &c->decomp_size,
yading@10:                        buf_size);
yading@10:         if (!c->decomp_buf) {
yading@10:             av_log(avctx, AV_LOG_ERROR,
yading@10:                    "Can't allocate decompression buffer.\n");
yading@10:             return AVERROR(ENOMEM);
yading@10:         }
yading@10:         ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
yading@10:                               c->lq, c->cq);
yading@10:         return 1;
yading@10:     } else if (quality != c->quality)
yading@10:         ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height,
yading@10:                               c->lq, c->cq);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf = avpkt->data;
yading@10:     int buf_size       = avpkt->size;
yading@10:     NuvContext *c      = avctx->priv_data;
yading@10:     AVFrame *picture   = data;
yading@10:     int orig_size      = buf_size;
yading@10:     int keyframe;
yading@10:     int size_change = 0;
yading@10:     int result, init_frame = !avctx->frame_number;
yading@10:     enum {
yading@10:         NUV_UNCOMPRESSED  = '0',
yading@10:         NUV_RTJPEG        = '1',
yading@10:         NUV_RTJPEG_IN_LZO = '2',
yading@10:         NUV_LZO           = '3',
yading@10:         NUV_BLACK         = 'N',
yading@10:         NUV_COPY_LAST     = 'L'
yading@10:     } comptype;
yading@10: 
yading@10:     if (buf_size < 12) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     // codec data (rtjpeg quant tables)
yading@10:     if (buf[0] == 'D' && buf[1] == 'R') {
yading@10:         int ret;
yading@10:         // skip rest of the frameheader.
yading@10:         buf       = &buf[12];
yading@10:         buf_size -= 12;
yading@10:         ret       = get_quant(avctx, c, buf, buf_size);
yading@10:         if (ret < 0)
yading@10:             return ret;
yading@10:         ff_rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq,
yading@10:                               c->cq);
yading@10:         return orig_size;
yading@10:     }
yading@10: 
yading@10:     if (buf_size < 12 || buf[0] != 'V') {
yading@10:         av_log(avctx, AV_LOG_ERROR, "not a nuv video frame\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10:     comptype = buf[1];
yading@10:     switch (comptype) {
yading@10:     case NUV_RTJPEG_IN_LZO:
yading@10:     case NUV_RTJPEG:
yading@10:         keyframe = !buf[2];
yading@10:         break;
yading@10:     case NUV_COPY_LAST:
yading@10:         keyframe = 0;
yading@10:         break;
yading@10:     default:
yading@10:         keyframe = 1;
yading@10:         break;
yading@10:     }
yading@10: retry:
yading@10:     // skip rest of the frameheader.
yading@10:     buf       = &buf[12];
yading@10:     buf_size -= 12;
yading@10:     if (comptype == NUV_RTJPEG_IN_LZO || comptype == NUV_LZO) {
yading@10:         int outlen = c->decomp_size - AV_LZO_OUTPUT_PADDING, inlen = buf_size;
yading@10:         if (av_lzo1x_decode(c->decomp_buf, &outlen, buf, &inlen))
yading@10:             av_log(avctx, AV_LOG_ERROR, "error during lzo decompression\n");
yading@10:         buf      = c->decomp_buf;
yading@10:         buf_size = c->decomp_size - AV_LZO_OUTPUT_PADDING - outlen;
yading@10:     }
yading@10:     if (c->codec_frameheader) {
yading@10:         int w, h, q;
yading@10:         if (buf_size < RTJPEG_HEADER_SIZE) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Too small NUV video frame\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         // There seem to exist two variants of this header: one starts with 'V'
yading@10:         // and 5 bytes unknown, the other matches current MythTV and is 4 bytes size,
yading@10:         // 1 byte header size (== 12), 1 byte version (== 0)
yading@10:         if (buf[0] != 'V' && AV_RL16(&buf[4]) != 0x000c) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Unknown secondary frame header (wrong codec_tag?)\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         w = AV_RL16(&buf[6]);
yading@10:         h = AV_RL16(&buf[8]);
yading@10:         q = buf[10];
yading@10:         if ((result = codec_reinit(avctx, w, h, q)) < 0)
yading@10:             return result;
yading@10:         if (result) {
yading@10:             buf = avpkt->data;
yading@10:             buf_size = avpkt->size;
yading@10:             size_change = 1;
yading@10:             goto retry;
yading@10:         }
yading@10:         buf       = &buf[RTJPEG_HEADER_SIZE];
yading@10:         buf_size -= RTJPEG_HEADER_SIZE;
yading@10:     }
yading@10: 
yading@10:     if (size_change || keyframe) {
yading@10:         av_frame_unref(&c->pic);
yading@10:         init_frame = 1;
yading@10:     }
yading@10: 
yading@10:     if ((result = ff_reget_buffer(avctx, &c->pic)) < 0)
yading@10:         return result;
yading@10:     if (init_frame) {
yading@10:         memset(c->pic.data[0], 0,    avctx->height * c->pic.linesize[0]);
yading@10:         memset(c->pic.data[1], 0x80, avctx->height * c->pic.linesize[1] / 2);
yading@10:         memset(c->pic.data[2], 0x80, avctx->height * c->pic.linesize[2] / 2);
yading@10:     }
yading@10: 
yading@10:     c->pic.pict_type = keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
yading@10:     c->pic.key_frame = keyframe;
yading@10:     // decompress/copy/whatever data
yading@10:     switch (comptype) {
yading@10:     case NUV_LZO:
yading@10:     case NUV_UNCOMPRESSED: {
yading@10:         int height = c->height;
yading@10:         if (buf_size < c->width * height * 3 / 2) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "uncompressed frame too short\n");
yading@10:             height = buf_size / c->width / 3 * 2;
yading@10:         }
yading@10:         if(height > 0)
yading@10:             copy_frame(&c->pic, buf, c->width, height);
yading@10:         break;
yading@10:     }
yading@10:     case NUV_RTJPEG_IN_LZO:
yading@10:     case NUV_RTJPEG:
yading@10:         ff_rtjpeg_decode_frame_yuv420(&c->rtj, &c->pic, buf, buf_size);
yading@10:         break;
yading@10:     case NUV_BLACK:
yading@10:         memset(c->pic.data[0], 0, c->width * c->height);
yading@10:         memset(c->pic.data[1], 128, c->width * c->height / 4);
yading@10:         memset(c->pic.data[2], 128, c->width * c->height / 4);
yading@10:         break;
yading@10:     case NUV_COPY_LAST:
yading@10:         /* nothing more to do here */
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "unknown compression\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((result = av_frame_ref(picture, &c->pic)) < 0)
yading@10:         return result;
yading@10: 
yading@10:     *got_frame = 1;
yading@10:     return orig_size;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     NuvContext *c  = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     avctx->pix_fmt = AV_PIX_FMT_YUV420P;
yading@10:     c->pic.data[0] = NULL;
yading@10:     c->decomp_buf  = NULL;
yading@10:     c->quality     = -1;
yading@10:     c->width       = 0;
yading@10:     c->height      = 0;
yading@10: 
yading@10:     c->codec_frameheader = avctx->codec_tag == MKTAG('R', 'J', 'P', 'G');
yading@10: 
yading@10:     if (avctx->extradata_size)
yading@10:         get_quant(avctx, c, avctx->extradata, avctx->extradata_size);
yading@10: 
yading@10:     ff_dsputil_init(&c->dsp, avctx);
yading@10: 
yading@10:     if ((ret = codec_reinit(avctx, avctx->width, avctx->height, -1)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     NuvContext *c = avctx->priv_data;
yading@10: 
yading@10:     av_freep(&c->decomp_buf);
yading@10:     av_frame_unref(&c->pic);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_nuv_decoder = {
yading@10:     .name           = "nuv",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_NUV,
yading@10:     .priv_data_size = sizeof(NuvContext),
yading@10:     .init           = decode_init,
yading@10:     .close          = decode_end,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("NuppelVideo/RTJPEG"),
yading@10: };