Originally committed as revision 8906 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Diego Biurrun
18 years ago
parent
bbb7d4c76b
commit
0d02cacda9
3 changed files with 197 additions and 171 deletions
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/*
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* DVB subtitle parser for FFmpeg |
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* Copyright (c) 2005 Ian Caulfield. |
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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 "dsputil.h" |
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#include "bitstream.h" |
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//#define DEBUG
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//#define DEBUG_PACKET_CONTENTS
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/* Parser (mostly) copied from dvdsub.c */ |
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#define PARSE_BUF_SIZE (65536) |
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/* parser definition */ |
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typedef struct DVBSubParseContext { |
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uint8_t *packet_buf; |
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int packet_start; |
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int packet_index; |
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int in_packet; |
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} DVBSubParseContext; |
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static int dvbsub_parse_init(AVCodecParserContext *s) |
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{ |
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DVBSubParseContext *pc = s->priv_data; |
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pc->packet_buf = av_malloc(PARSE_BUF_SIZE); |
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return 0; |
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} |
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static int dvbsub_parse(AVCodecParserContext *s, |
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AVCodecContext *avctx, |
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uint8_t **poutbuf, int *poutbuf_size, |
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const uint8_t *buf, int buf_size) |
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{ |
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DVBSubParseContext *pc = s->priv_data; |
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uint8_t *p, *p_end; |
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int len, buf_pos = 0; |
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#ifdef DEBUG |
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av_log(avctx, AV_LOG_INFO, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n", |
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s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]); |
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#endif |
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#ifdef DEBUG_PACKET_CONTENTS |
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int i; |
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for (i=0; i < buf_size; i++) |
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{ |
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av_log(avctx, AV_LOG_INFO, "%02x ", buf[i]); |
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if (i % 16 == 15) |
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av_log(avctx, AV_LOG_INFO, "\n"); |
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} |
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if (i % 16 != 0) |
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av_log(avctx, AV_LOG_INFO, "\n"); |
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#endif |
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*poutbuf = NULL; |
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*poutbuf_size = 0; |
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s->fetch_timestamp = 1; |
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if (s->last_pts != s->pts && s->last_pts != AV_NOPTS_VALUE) /* Start of a new packet */ |
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{ |
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if (pc->packet_index != pc->packet_start) |
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{ |
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#ifdef DEBUG |
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av_log(avctx, AV_LOG_INFO, "Discarding %d bytes\n", |
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pc->packet_index - pc->packet_start); |
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#endif |
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} |
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pc->packet_start = 0; |
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pc->packet_index = 0; |
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if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) { |
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#ifdef DEBUG |
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av_log(avctx, AV_LOG_INFO, "Bad packet header\n"); |
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#endif |
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return -1; |
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} |
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buf_pos = 2; |
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pc->in_packet = 1; |
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} else { |
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if (pc->packet_start != 0) |
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{ |
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if (pc->packet_index != pc->packet_start) |
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{ |
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memmove(pc->packet_buf, pc->packet_buf + pc->packet_start, |
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pc->packet_index - pc->packet_start); |
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pc->packet_index -= pc->packet_start; |
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pc->packet_start = 0; |
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} else { |
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pc->packet_start = 0; |
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pc->packet_index = 0; |
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} |
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} |
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} |
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if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE) |
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return -1; |
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/* if not currently in a packet, discard data */ |
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if (pc->in_packet == 0) |
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return buf_size; |
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memcpy(pc->packet_buf + pc->packet_index, buf + buf_pos, buf_size - buf_pos); |
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pc->packet_index += buf_size - buf_pos; |
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p = pc->packet_buf; |
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p_end = pc->packet_buf + pc->packet_index; |
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while (p < p_end) |
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{ |
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if (*p == 0x0f) |
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{ |
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if (p + 6 <= p_end) |
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{ |
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len = AV_RB16(p + 4); |
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if (p + len + 6 <= p_end) |
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{ |
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*poutbuf_size += len + 6; |
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p += len + 6; |
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} else |
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break; |
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} else |
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break; |
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} else if (*p == 0xff) { |
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if (p + 1 < p_end) |
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{ |
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#ifdef DEBUG |
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av_log(avctx, AV_LOG_INFO, "Junk at end of packet\n"); |
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#endif |
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} |
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pc->packet_index = p - pc->packet_buf; |
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pc->in_packet = 0; |
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break; |
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} else { |
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av_log(avctx, AV_LOG_ERROR, "Junk in packet\n"); |
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pc->packet_index = p - pc->packet_buf; |
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pc->in_packet = 0; |
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break; |
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} |
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} |
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if (*poutbuf_size > 0) |
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{ |
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*poutbuf = pc->packet_buf; |
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pc->packet_start = *poutbuf_size; |
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} |
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if (s->last_pts == AV_NOPTS_VALUE) |
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s->last_pts = s->pts; |
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return buf_size; |
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} |
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static void dvbsub_parse_close(AVCodecParserContext *s) |
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{ |
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DVBSubParseContext *pc = s->priv_data; |
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av_freep(&pc->packet_buf); |
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} |
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AVCodecParser dvbsub_parser = { |
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{ CODEC_ID_DVB_SUBTITLE }, |
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sizeof(DVBSubParseContext), |
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dvbsub_parse_init, |
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dvbsub_parse, |
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dvbsub_parse_close, |
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}; |
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