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222 lines
6.8 KiB
222 lines
6.8 KiB
/* |
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* Creative YUV (CYUV) Video Decoder |
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* by Mike Melanson (melanson@pcisys.net) |
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* based on "Creative YUV (CYUV) stream format for AVI": |
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* http://www.csse.monash.edu.au/~timf/videocodec/cyuv.txt |
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* |
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* Copyright (C) 2003 the ffmpeg project |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/** |
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* @file |
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* Creative YUV (CYUV) Video Decoder. |
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*/ |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <string.h> |
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#include "avcodec.h" |
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#include "dsputil.h" |
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#include "libavutil/internal.h" |
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typedef struct CyuvDecodeContext { |
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AVCodecContext *avctx; |
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int width, height; |
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AVFrame frame; |
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} CyuvDecodeContext; |
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static av_cold int cyuv_decode_init(AVCodecContext *avctx) |
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{ |
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CyuvDecodeContext *s = avctx->priv_data; |
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s->avctx = avctx; |
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s->width = avctx->width; |
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/* width needs to be divisible by 4 for this codec to work */ |
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if (s->width & 0x3) |
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return -1; |
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s->height = avctx->height; |
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avcodec_get_frame_defaults(&s->frame); |
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return 0; |
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} |
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static int cyuv_decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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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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CyuvDecodeContext *s=avctx->priv_data; |
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unsigned char *y_plane; |
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unsigned char *u_plane; |
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unsigned char *v_plane; |
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int y_ptr; |
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int u_ptr; |
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int v_ptr; |
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/* prediction error tables (make it clear that they are signed values) */ |
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const signed char *y_table = (const signed char*)buf + 0; |
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const signed char *u_table = (const signed char*)buf + 16; |
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const signed char *v_table = (const signed char*)buf + 32; |
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unsigned char y_pred, u_pred, v_pred; |
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int stream_ptr; |
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unsigned char cur_byte; |
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int pixel_groups; |
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int rawsize = s->height * FFALIGN(s->width,2) * 2; |
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if (avctx->codec_id == AV_CODEC_ID_AURA) { |
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y_table = u_table; |
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u_table = v_table; |
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} |
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/* sanity check the buffer size: A buffer has 3x16-bytes tables |
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* followed by (height) lines each with 3 bytes to represent groups |
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* of 4 pixels. Thus, the total size of the buffer ought to be: |
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* (3 * 16) + height * (width * 3 / 4) */ |
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if (buf_size == 48 + s->height * (s->width * 3 / 4)) { |
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avctx->pix_fmt = PIX_FMT_YUV411P; |
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} else if(buf_size == rawsize ) { |
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avctx->pix_fmt = PIX_FMT_UYVY422; |
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} else { |
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av_log(avctx, AV_LOG_ERROR, "got a buffer with %d bytes when %d were expected\n", |
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buf_size, 48 + s->height * (s->width * 3 / 4)); |
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return -1; |
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} |
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/* pixel data starts 48 bytes in, after 3x16-byte tables */ |
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stream_ptr = 48; |
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if (s->frame.data[0]) |
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avctx->release_buffer(avctx, &s->frame); |
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s->frame.buffer_hints = FF_BUFFER_HINTS_VALID; |
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s->frame.reference = 0; |
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if (avctx->get_buffer(avctx, &s->frame) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return -1; |
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} |
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y_plane = s->frame.data[0]; |
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u_plane = s->frame.data[1]; |
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v_plane = s->frame.data[2]; |
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if (buf_size == rawsize) { |
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int linesize = FFALIGN(s->width,2) * 2; |
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y_plane += s->frame.linesize[0] * s->height; |
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for (stream_ptr = 0; stream_ptr < rawsize; stream_ptr += linesize) { |
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y_plane -= s->frame.linesize[0]; |
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memcpy(y_plane, buf+stream_ptr, linesize); |
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} |
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} else { |
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/* iterate through each line in the height */ |
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for (y_ptr = 0, u_ptr = 0, v_ptr = 0; |
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y_ptr < (s->height * s->frame.linesize[0]); |
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y_ptr += s->frame.linesize[0] - s->width, |
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u_ptr += s->frame.linesize[1] - s->width / 4, |
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v_ptr += s->frame.linesize[2] - s->width / 4) { |
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/* reset predictors */ |
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cur_byte = buf[stream_ptr++]; |
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u_plane[u_ptr++] = u_pred = cur_byte & 0xF0; |
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y_plane[y_ptr++] = y_pred = (cur_byte & 0x0F) << 4; |
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cur_byte = buf[stream_ptr++]; |
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v_plane[v_ptr++] = v_pred = cur_byte & 0xF0; |
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y_pred += y_table[cur_byte & 0x0F]; |
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y_plane[y_ptr++] = y_pred; |
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cur_byte = buf[stream_ptr++]; |
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y_pred += y_table[cur_byte & 0x0F]; |
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y_plane[y_ptr++] = y_pred; |
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y_pred += y_table[(cur_byte & 0xF0) >> 4]; |
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y_plane[y_ptr++] = y_pred; |
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/* iterate through the remaining pixel groups (4 pixels/group) */ |
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pixel_groups = s->width / 4 - 1; |
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while (pixel_groups--) { |
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cur_byte = buf[stream_ptr++]; |
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u_pred += u_table[(cur_byte & 0xF0) >> 4]; |
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u_plane[u_ptr++] = u_pred; |
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y_pred += y_table[cur_byte & 0x0F]; |
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y_plane[y_ptr++] = y_pred; |
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cur_byte = buf[stream_ptr++]; |
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v_pred += v_table[(cur_byte & 0xF0) >> 4]; |
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v_plane[v_ptr++] = v_pred; |
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y_pred += y_table[cur_byte & 0x0F]; |
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y_plane[y_ptr++] = y_pred; |
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cur_byte = buf[stream_ptr++]; |
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y_pred += y_table[cur_byte & 0x0F]; |
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y_plane[y_ptr++] = y_pred; |
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y_pred += y_table[(cur_byte & 0xF0) >> 4]; |
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y_plane[y_ptr++] = y_pred; |
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} |
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} |
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} |
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*data_size=sizeof(AVFrame); |
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*(AVFrame*)data= s->frame; |
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return buf_size; |
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} |
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static av_cold int cyuv_decode_end(AVCodecContext *avctx) |
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{ |
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CyuvDecodeContext *s = avctx->priv_data; |
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if (s->frame.data[0]) |
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avctx->release_buffer(avctx, &s->frame); |
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return 0; |
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} |
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#if CONFIG_AURA_DECODER |
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AVCodec ff_aura_decoder = { |
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.name = "aura", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_AURA, |
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.priv_data_size = sizeof(CyuvDecodeContext), |
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.init = cyuv_decode_init, |
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.close = cyuv_decode_end, |
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.decode = cyuv_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Auravision AURA"), |
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}; |
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#endif |
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#if CONFIG_CYUV_DECODER |
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AVCodec ff_cyuv_decoder = { |
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.name = "cyuv", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_CYUV, |
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.priv_data_size = sizeof(CyuvDecodeContext), |
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.init = cyuv_decode_init, |
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.close = cyuv_decode_end, |
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.decode = cyuv_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Creative YUV (CYUV)"), |
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}; |
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#endif
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