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121 lines
3.5 KiB
121 lines
3.5 KiB
/* |
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* Sunplus JPEG decoder (SP5X) |
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* Copyright (c) 2003 Alex Beregszaszi |
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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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* Sunplus JPEG decoder (SP5X). |
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*/ |
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#include "avcodec.h" |
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#include "mjpeg.h" |
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#include "mjpegdec.h" |
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#include "sp5x.h" |
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static int sp5x_decode_frame(AVCodecContext *avctx, |
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void *data, int *got_frame, |
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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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AVPacket avpkt_recoded; |
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const int qscale = 5; |
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uint8_t *recoded; |
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int i = 0, j = 0; |
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if (!avctx->width || !avctx->height) |
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return -1; |
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recoded = av_mallocz(buf_size + 1024); |
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if (!recoded) |
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return -1; |
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/* SOI */ |
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recoded[j++] = 0xFF; |
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recoded[j++] = 0xD8; |
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memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt)); |
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memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64); |
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memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64); |
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j += sizeof(sp5x_data_dqt); |
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memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht)); |
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j += sizeof(sp5x_data_dht); |
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memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof)); |
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AV_WB16(recoded+j+5, avctx->coded_height); |
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AV_WB16(recoded+j+7, avctx->coded_width); |
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j += sizeof(sp5x_data_sof); |
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memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos)); |
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j += sizeof(sp5x_data_sos); |
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if(avctx->codec_id==AV_CODEC_ID_AMV) |
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for (i = 2; i < buf_size-2 && j < buf_size+1024-2; i++) |
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recoded[j++] = buf[i]; |
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else |
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for (i = 14; i < buf_size && j < buf_size+1024-3; i++) |
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{ |
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recoded[j++] = buf[i]; |
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if (buf[i] == 0xff) |
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recoded[j++] = 0; |
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} |
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/* EOI */ |
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recoded[j++] = 0xFF; |
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recoded[j++] = 0xD9; |
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av_init_packet(&avpkt_recoded); |
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avpkt_recoded.data = recoded; |
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avpkt_recoded.size = j; |
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i = ff_mjpeg_decode_frame(avctx, data, got_frame, &avpkt_recoded); |
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av_free(recoded); |
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return i < 0 ? i : avpkt->size; |
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} |
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#if CONFIG_SP5X_DECODER |
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AVCodec ff_sp5x_decoder = { |
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.name = "sp5x", |
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.long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_SP5X, |
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.priv_data_size = sizeof(MJpegDecodeContext), |
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.init = ff_mjpeg_decode_init, |
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.close = ff_mjpeg_decode_end, |
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.decode = sp5x_decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.max_lowres = 3, |
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}; |
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#endif |
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#if CONFIG_AMV_DECODER |
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AVCodec ff_amv_decoder = { |
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.name = "amv", |
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.long_name = NULL_IF_CONFIG_SMALL("AMV Video"), |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = AV_CODEC_ID_AMV, |
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.priv_data_size = sizeof(MJpegDecodeContext), |
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.init = ff_mjpeg_decode_init, |
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.close = ff_mjpeg_decode_end, |
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.decode = sp5x_decode_frame, |
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}; |
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#endif
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