mirror of
https://git.videolan.org/git/ffmpeg.git
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223 lines
5.8 KiB
C
223 lines
5.8 KiB
C
/*
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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 *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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AVPacket avpkt_recoded;
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#if 0
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MJpegDecodeContext *s = avctx->priv_data;
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#endif
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const int qscale = 5;
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const uint8_t *buf_ptr;
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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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buf_ptr = buf;
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#if 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==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+1024-2; 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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avctx->flags &= ~CODEC_FLAG_EMU_EDGE;
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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, data_size, &avpkt_recoded);
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av_free(recoded);
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#else
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/* SOF */
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s->bits = 8;
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s->width = avctx->coded_width;
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s->height = avctx->coded_height;
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s->nb_components = 3;
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s->component_id[0] = 0;
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s->h_count[0] = 2;
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s->v_count[0] = 2;
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s->quant_index[0] = 0;
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s->component_id[1] = 1;
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s->h_count[1] = 1;
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s->v_count[1] = 1;
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s->quant_index[1] = 1;
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s->component_id[2] = 2;
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s->h_count[2] = 1;
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s->v_count[2] = 1;
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s->quant_index[2] = 1;
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s->h_max = 2;
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s->v_max = 2;
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s->qscale_table = av_mallocz((s->width+15)/16);
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avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
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s->interlaced = 0;
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s->picture.reference = 0;
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if (avctx->get_buffer(avctx, &s->picture) < 0)
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{
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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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s->picture.pict_type = FF_I_TYPE;
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s->picture.key_frame = 1;
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for (i = 0; i < 3; i++)
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s->linesize[i] = s->picture.linesize[i] << s->interlaced;
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/* DQT */
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for (i = 0; i < 64; i++)
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{
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j = s->scantable.permutated[i];
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s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
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}
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s->qscale[0] = FFMAX(
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s->quant_matrixes[0][s->scantable.permutated[1]],
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s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
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for (i = 0; i < 64; i++)
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{
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j = s->scantable.permutated[i];
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s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
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}
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s->qscale[1] = FFMAX(
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s->quant_matrixes[1][s->scantable.permutated[1]],
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s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
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/* DHT */
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/* SOS */
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s->comp_index[0] = 0;
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s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
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s->h_scount[0] = s->h_count[0];
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s->v_scount[0] = s->v_count[0];
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s->dc_index[0] = 0;
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s->ac_index[0] = 0;
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s->comp_index[1] = 1;
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s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
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s->h_scount[1] = s->h_count[1];
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s->v_scount[1] = s->v_count[1];
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s->dc_index[1] = 1;
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s->ac_index[1] = 1;
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s->comp_index[2] = 2;
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s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
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s->h_scount[2] = s->h_count[2];
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s->v_scount[2] = s->v_count[2];
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s->dc_index[2] = 1;
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s->ac_index[2] = 1;
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for (i = 0; i < 3; i++)
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s->last_dc[i] = 1024;
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s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
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s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
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init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
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return mjpeg_decode_scan(s);
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#endif
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return i;
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}
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AVCodec sp5x_decoder = {
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"sp5x",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_SP5X,
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sizeof(MJpegDecodeContext),
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ff_mjpeg_decode_init,
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NULL,
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ff_mjpeg_decode_end,
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sp5x_decode_frame,
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CODEC_CAP_DR1,
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NULL,
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.max_lowres = 5,
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.long_name = NULL_IF_CONFIG_SMALL("Sunplus JPEG (SP5X)"),
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};
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AVCodec amv_decoder = {
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"amv",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_AMV,
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sizeof(MJpegDecodeContext),
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ff_mjpeg_decode_init,
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NULL,
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ff_mjpeg_decode_end,
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sp5x_decode_frame,
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CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("AMV Video"),
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};
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