| /* |
| * Discworld II BMV demuxer |
| * Copyright (c) 2011 Konstantin Shishkov |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| |
| #include "libavutil/channel_layout.h" |
| #include "avformat.h" |
| #include "internal.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) |
| { |
| AVStream *st, *ast; |
| BMVContext *c = s->priv_data; |
| |
| st = avformat_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codecpar->codec_id = AV_CODEC_ID_BMV_VIDEO; |
| st->codecpar->width = 640; |
| st->codecpar->height = 429; |
| st->codecpar->format = AV_PIX_FMT_PAL8; |
| avpriv_set_pts_info(st, 16, 1, 12); |
| ast = avformat_new_stream(s, 0); |
| if (!ast) |
| return AVERROR(ENOMEM); |
| ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| ast->codecpar->codec_id = AV_CODEC_ID_BMV_AUDIO; |
| ast->codecpar->channels = 2; |
| ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO; |
| ast->codecpar->sample_rate = 22050; |
| avpriv_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, err; |
| |
| 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; |
| if ((err = av_reallocp(&c->packet, c->size + 1)) < 0) |
| return err; |
| 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 ((err = av_new_packet(pkt, audio_size)) < 0) |
| return err; |
| 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 ((err = av_new_packet(pkt, c->size + 1)) < 0) |
| return err; |
| 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", |
| }; |