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Diffstat (limited to 'contrib/ffmpeg/libavcodec/nuv.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/nuv.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/nuv.c b/contrib/ffmpeg/libavcodec/nuv.c new file mode 100644 index 000000000..6193806fa --- /dev/null +++ b/contrib/ffmpeg/libavcodec/nuv.c @@ -0,0 +1,275 @@ +/* + * 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 "avcodec.h" + +#include "bswap.h" +#include "dsputil.h" +#include "lzo.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 = (width + 1) & ~1; + height = (height + 1) & ~1; + if (quality >= 0) + get_quant_quality(c, quality); + if (width != c->width || height != c->height) { + if (avcodec_check_dimensions(avctx, height, width) < 0) + return 0; + avctx->width = c->width = width; + avctx->height = c->height = height; + c->decomp_size = c->height * c->width * 3 / 2; + c->decomp_buf = av_realloc(c->decomp_buf, c->decomp_size + LZO_OUTPUT_PADDING); + if (!c->decomp_buf) { + av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); + return 0; + } + rtjpeg_decode_init(&c->rtj, &c->dsp, c->width, c->height, c->lq, c->cq); + } else if (quality != c->quality) + 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, + const uint8_t *buf, int buf_size) { + NuvContext *c = avctx->priv_data; + AVFrame *picture = data; + int orig_size = buf_size; + 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; + 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]; + // 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 (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_size < 12) { + av_log(avctx, AV_LOG_ERROR, "invalid nuv video frame\n"); + return -1; + } + 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 (c->pic.data[0]) + avctx->release_buffer(avctx, &c->pic); + c->pic.reference = 1; + c->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE | + FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE; + if (avctx->get_buffer(avctx, &c->pic) < 0) { + av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); + return -1; + } + + c->pic.pict_type = FF_I_TYPE; + c->pic.key_frame = 1; + // 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: { + 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: { + c->pic.pict_type = FF_P_TYPE; + c->pic.key_frame = 0; + /* 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 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); + dsputil_init(&c->dsp, avctx); + if (!codec_reinit(avctx, avctx->width, avctx->height, -1)) + return 1; + return 0; +} + +static 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 nuv_decoder = { + "nuv", + CODEC_TYPE_VIDEO, + CODEC_ID_NUV, + sizeof(NuvContext), + decode_init, + NULL, + decode_end, + decode_frame, + CODEC_CAP_DR1, +}; 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