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/* |
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* CPiA video decoder. |
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* Copyright (c) 2010 Hans de Goede <hdegoede@redhat.com> |
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* |
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* This decoder is based on the LGPL code available at |
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* https://v4l4j.googlecode.com/svn/v4l4j/trunk/libvideo/libv4lconvert/cpia1.c |
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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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#include "avcodec.h" |
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#include "get_bits.h" |
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#include "internal.h" |
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#define FRAME_HEADER_SIZE 64 |
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#define MAGIC_0 0x19 /**< First header byte */ |
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#define MAGIC_1 0x68 /**< Second header byte */ |
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#define SUBSAMPLE_420 0 |
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#define SUBSAMPLE_422 1 |
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#define YUVORDER_YUYV 0 |
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#define YUVORDER_UYVY 1 |
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#define NOT_COMPRESSED 0 |
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#define COMPRESSED 1 |
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#define NO_DECIMATION 0 |
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#define DECIMATION_ENAB 1 |
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#define EOL 0xfd /**< End Of Line marker */ |
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#define EOI 0xff /**< End Of Image marker */ |
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typedef struct { |
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AVFrame *frame; |
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} CpiaContext; |
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static int cpia_decode_frame(AVCodecContext *avctx, |
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void *data, int *got_frame, AVPacket* avpkt) |
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{ |
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CpiaContext* const cpia = avctx->priv_data; |
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int i,j,ret; |
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uint8_t* const header = avpkt->data; |
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uint8_t* src; |
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int src_size; |
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uint16_t linelength; |
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uint8_t skip; |
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AVFrame *frame = cpia->frame; |
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uint8_t *y, *u, *v, *y_end, *u_end, *v_end; |
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// Check header |
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if ( avpkt->size < FRAME_HEADER_SIZE + avctx->height * 3 |
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|| header[0] != MAGIC_0 || header[1] != MAGIC_1 |
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|| (header[17] != SUBSAMPLE_420 && header[17] != SUBSAMPLE_422) |
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|| (header[18] != YUVORDER_YUYV && header[18] != YUVORDER_UYVY) |
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|| (header[28] != NOT_COMPRESSED && header[28] != COMPRESSED) |
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|| (header[29] != NO_DECIMATION && header[29] != DECIMATION_ENAB) |
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) { |
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av_log(avctx, AV_LOG_ERROR, "Invalid header!\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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// currently unsupported properties |
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if (header[17] == SUBSAMPLE_422) { |
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avpriv_report_missing_feature(avctx, "4:2:2 subsampling"); |
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return AVERROR_PATCHWELCOME; |
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} |
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if (header[18] == YUVORDER_UYVY) { |
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avpriv_report_missing_feature(avctx, "YUV byte order UYVY"); |
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return AVERROR_PATCHWELCOME; |
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} |
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if (header[29] == DECIMATION_ENAB) { |
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avpriv_report_missing_feature(avctx, "Decimation"); |
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return AVERROR_PATCHWELCOME; |
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} |
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src = header + FRAME_HEADER_SIZE; |
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src_size = avpkt->size - FRAME_HEADER_SIZE; |
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if (header[28] == NOT_COMPRESSED) { |
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frame->pict_type = AV_PICTURE_TYPE_I; |
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frame->key_frame = 1; |
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} else { |
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frame->pict_type = AV_PICTURE_TYPE_P; |
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frame->key_frame = 0; |
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} |
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// Get buffer filled with previous frame |
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if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0) |
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return ret; |
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for ( i = 0; |
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i < frame->height; |
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i++, src += linelength, src_size -= linelength |
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) { |
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// Read line length, two byte little endian |
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linelength = AV_RL16(src); |
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src += 2; |
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if (src_size < linelength) { |
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frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM; |
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av_log(avctx, AV_LOG_WARNING, "Frame ended unexpectedly!\n"); |
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break; |
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} |
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if (src[linelength - 1] != EOL) { |
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frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM; |
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av_log(avctx, AV_LOG_WARNING, "Wrong line length %d or line not terminated properly (found 0x%02x)!\n", linelength, src[linelength - 1]); |
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break; |
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} |
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/* Update the data pointers. Y data is on every line. |
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* U and V data on every second line |
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*/ |
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y = &frame->data[0][i * frame->linesize[0]]; |
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u = &frame->data[1][(i >> 1) * frame->linesize[1]]; |
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v = &frame->data[2][(i >> 1) * frame->linesize[2]]; |
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y_end = y + frame->linesize[0] - 1; |
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u_end = u + frame->linesize[1] - 1; |
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v_end = v + frame->linesize[2] - 1; |
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if ((i & 1) && header[17] == SUBSAMPLE_420) { |
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/* We are on an odd line and 420 subsample is used. |
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* On this line only Y values are specified, one per pixel. |
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*/ |
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for (j = 0; j < linelength - 1; j++) { |
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if (y > y_end) { |
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frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM; |
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av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n"); |
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break; |
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} |
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if ((src[j] & 1) && header[28] == COMPRESSED) { |
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/* It seems that odd lines are always uncompressed, but |
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* we do it according to specification anyways. |
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*/ |
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skip = src[j] >> 1; |
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y += skip; |
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} else { |
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*(y++) = src[j]; |
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} |
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} |
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} else if (header[17] == SUBSAMPLE_420) { |
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/* We are on an even line and 420 subsample is used. |
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* On this line each pair of pixels is described by four bytes. |
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*/ |
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for (j = 0; j < linelength - 4; ) { |
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if (y + 1 > y_end || u > u_end || v > v_end) { |
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frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM; |
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av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n"); |
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break; |
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} |
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if ((src[j] & 1) && header[28] == COMPRESSED) { |
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// Skip amount of pixels and move forward one byte |
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skip = src[j] >> 1; |
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y += skip; |
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u += skip >> 1; |
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v += skip >> 1; |
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j++; |
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} else { |
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// Set image data as specified and move forward 4 bytes |
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*(y++) = src[j]; |
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*(u++) = src[j+1]; |
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*(y++) = src[j+2]; |
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*(v++) = src[j+3]; |
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j += 4; |
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} |
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} |
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} |
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} |
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*got_frame = 1; |
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if ((ret = av_frame_ref(data, cpia->frame)) < 0) |
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return ret; |
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return avpkt->size; |
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} |
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static av_cold int cpia_decode_init(AVCodecContext *avctx) |
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{ |
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CpiaContext *s = avctx->priv_data; |
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// output pixel format |
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avctx->pix_fmt = AV_PIX_FMT_YUV420P; |
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/* The default timebase set by the v4l2 demuxer leads to probing which is buggy. |
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* Set some reasonable time_base to skip this. |
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*/ |
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if (avctx->time_base.num == 1 && avctx->time_base.den == 1000000) { |
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avctx->time_base.num = 1; |
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avctx->time_base.den = 60; |
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} |
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s->frame = av_frame_alloc(); |
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if (!s->frame) |
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return AVERROR(ENOMEM); |
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return 0; |
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} |
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static av_cold int cpia_decode_end(AVCodecContext *avctx) |
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{ |
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CpiaContext *s = avctx->priv_data; |
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av_frame_free(&s->frame); |
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return 0; |
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} |
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AVCodec ff_cpia_decoder = { |
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.name = "cpia", |
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.long_name = NULL_IF_CONFIG_SMALL("CPiA video format"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_CPIA, |
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.priv_data_size = sizeof(CpiaContext), |
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.init = cpia_decode_init, |
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.close = cpia_decode_end, |
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.decode = cpia_decode_frame, |
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.capabilities = AV_CODEC_CAP_DR1, |
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}; |