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- /*
- * 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"
- #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->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- st->codec->codec_id = AV_CODEC_ID_BMV_VIDEO;
- st->codec->width = 640;
- st->codec->height = 429;
- st->codec->pix_fmt = PIX_FMT_PAL8;
- avpriv_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 = AV_CODEC_ID_BMV_AUDIO;
- ast->codec->channels = 2;
- ast->codec->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;
- 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",
- };
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