From f545e0067751b764917be53520d233db1bbb945d Mon Sep 17 00:00:00 2001 From: Kostya Shishkov Date: Tue, 1 Nov 2011 11:58:44 +0100 Subject: BMV demuxer and decoder MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Martin Storsjö --- libavformat/bmv.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 136 insertions(+) create mode 100644 libavformat/bmv.c (limited to 'libavformat/bmv.c') diff --git a/libavformat/bmv.c b/libavformat/bmv.c new file mode 100644 index 0000000000..fb41712868 --- /dev/null +++ b/libavformat/bmv.c @@ -0,0 +1,136 @@ +/* + * Discworld II BMV demuxer + * Copyright (c) 2011 Konstantin Shishkov. + * + * This file is part of Libav. + * + * Libav is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * Libav is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with Libav; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include "avformat.h" + +enum BMVFlags { + BMV_NOP = 0, + BMV_END, + BMV_DELTA, + BMV_INTRA, + + BMV_AUDIO = 0x20, +}; + +typedef struct BMVContext { + uint8_t *packet; + int size; + int get_next; + int64_t audio_pos; +} BMVContext; + +static int bmv_read_header(AVFormatContext *s, AVFormatParameters *ap) +{ + AVStream *st, *ast; + BMVContext *c = s->priv_data; + + st = avformat_new_stream(s, 0); + if (!st) + return AVERROR(ENOMEM); + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; + st->codec->codec_id = CODEC_ID_BMV_VIDEO; + st->codec->width = 640; + st->codec->height = 429; + st->codec->pix_fmt = PIX_FMT_PAL8; + av_set_pts_info(st, 16, 1, 12); + ast = avformat_new_stream(s, 0); + if (!ast) + return AVERROR(ENOMEM); + ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; + ast->codec->codec_id = CODEC_ID_BMV_AUDIO; + ast->codec->channels = 2; + ast->codec->sample_rate = 22050; + av_set_pts_info(ast, 16, 1, 22050); + + c->get_next = 1; + c->audio_pos = 0; + return 0; +} + +static int bmv_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + BMVContext *c = s->priv_data; + int type; + void *tmp; + + while (c->get_next) { + if (s->pb->eof_reached) + return AVERROR_EOF; + type = avio_r8(s->pb); + if (type == BMV_NOP) + continue; + if (type == BMV_END) + return AVERROR_EOF; + c->size = avio_rl24(s->pb); + if (!c->size) + return AVERROR_INVALIDDATA; + tmp = av_realloc(c->packet, c->size + 1); + if (!tmp) + return AVERROR(ENOMEM); + c->packet = tmp; + c->packet[0] = type; + if (avio_read(s->pb, c->packet + 1, c->size) != c->size) + return AVERROR(EIO); + if (type & BMV_AUDIO) { + int audio_size = c->packet[1] * 65 + 1; + if (audio_size >= c->size) { + av_log(s, AV_LOG_ERROR, "Reported audio size %d is bigger than packet size (%d)\n", + audio_size, c->size); + return AVERROR_INVALIDDATA; + } + if (av_new_packet(pkt, audio_size) < 0) + return AVERROR(ENOMEM); + memcpy(pkt->data, c->packet + 1, pkt->size); + pkt->stream_index = 1; + pkt->pts = c->audio_pos; + pkt->duration = c->packet[1] * 32; + c->audio_pos += pkt->duration; + c->get_next = 0; + return pkt->size; + } else + break; + } + if (av_new_packet(pkt, c->size + 1) < 0) + return AVERROR(ENOMEM); + pkt->stream_index = 0; + c->get_next = 1; + memcpy(pkt->data, c->packet, pkt->size); + return pkt->size; +} + +static int bmv_read_close(AVFormatContext *s) +{ + BMVContext *c = s->priv_data; + + av_freep(&c->packet); + + return 0; +} + +AVInputFormat ff_bmv_demuxer = { + .name = "bmv", + .long_name = NULL_IF_CONFIG_SMALL("Discworld II BMV"), + .priv_data_size = sizeof(BMVContext), + .read_header = bmv_read_header, + .read_packet = bmv_read_packet, + .read_close = bmv_read_close, + .extensions = "bmv" +}; -- cgit v1.2.3