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Diffstat (limited to 'ffmpeg1/libavcodec/nuv.c')
| -rw-r--r-- | ffmpeg1/libavcodec/nuv.c | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/nuv.c b/ffmpeg1/libavcodec/nuv.c new file mode 100644 index 0000000..edf777e --- /dev/null +++ b/ffmpeg1/libavcodec/nuv.c @@ -0,0 +1,341 @@ +/* + * 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"), +}; |