137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
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* Discworld II BMV demuxer
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* Copyright (c) 2011 Konstantin Shishkov.
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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 "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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enum BMVFlags {
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BMV_NOP = 0,
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BMV_END,
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BMV_DELTA,
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BMV_INTRA,
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BMV_AUDIO = 0x20,
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};
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typedef struct BMVContext {
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uint8_t *packet;
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int size;
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int get_next;
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int64_t audio_pos;
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} BMVContext;
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static int bmv_read_header(AVFormatContext *s)
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{
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AVStream *st, *ast;
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BMVContext *c = s->priv_data;
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st = avformat_new_stream(s, 0);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_BMV_VIDEO;
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st->codec->width = 640;
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st->codec->height = 429;
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st->codec->pix_fmt = AV_PIX_FMT_PAL8;
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avpriv_set_pts_info(st, 16, 1, 12);
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ast = avformat_new_stream(s, 0);
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if (!ast)
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return AVERROR(ENOMEM);
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codec->codec_id = AV_CODEC_ID_BMV_AUDIO;
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ast->codec->channels = 2;
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ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
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ast->codec->sample_rate = 22050;
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avpriv_set_pts_info(ast, 16, 1, 22050);
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c->get_next = 1;
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c->audio_pos = 0;
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return 0;
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}
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static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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BMVContext *c = s->priv_data;
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int type, err;
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while (c->get_next) {
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if (s->pb->eof_reached)
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return AVERROR_EOF;
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type = avio_r8(s->pb);
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if (type == BMV_NOP)
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continue;
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if (type == BMV_END)
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return AVERROR_EOF;
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c->size = avio_rl24(s->pb);
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if (!c->size)
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return AVERROR_INVALIDDATA;
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if ((err = av_reallocp(&c->packet, c->size + 1)) < 0)
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return err;
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c->packet[0] = type;
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if (avio_read(s->pb, c->packet + 1, c->size) != c->size)
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return AVERROR(EIO);
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if (type & BMV_AUDIO) {
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int audio_size = c->packet[1] * 65 + 1;
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if (audio_size >= c->size) {
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av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n",
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audio_size, c->size);
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return AVERROR_INVALIDDATA;
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}
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if (av_new_packet(pkt, audio_size) < 0)
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return AVERROR(ENOMEM);
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memcpy(pkt->data, c->packet + 1, pkt->size);
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pkt->stream_index = 1;
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pkt->pts = c->audio_pos;
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pkt->duration = c->packet[1] * 32;
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c->audio_pos += pkt->duration;
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c->get_next = 0;
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return pkt->size;
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} else
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break;
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}
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if (av_new_packet(pkt, c->size + 1) < 0)
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return AVERROR(ENOMEM);
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pkt->stream_index = 0;
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c->get_next = 1;
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memcpy(pkt->data, c->packet, pkt->size);
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return pkt->size;
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}
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static int bmv_read_close(AVFormatContext *s)
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{
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BMVContext *c = s->priv_data;
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av_freep(&c->packet);
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return 0;
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}
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AVInputFormat ff_bmv_demuxer = {
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.name = "bmv",
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.long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"),
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.priv_data_size = sizeof(BMVContext),
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.read_header = bmv_read_header,
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.read_packet = bmv_read_packet,
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.read_close = bmv_read_close,
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.extensions = "bmv",
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};
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