/* * Wing Commander III Movie (.mve) File Demuxer * Copyright (c) 2003 The FFmpeg project * * 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 */ /** * @file * Wing Commander III Movie file demuxer * by Mike Melanson (melanson@pcisys.net) * for more information on the WC3 .mve file format, visit: * http://www.pcisys.net/~melanson/codecs/ */ #include "libavutil/avstring.h" #include "libavutil/channel_layout.h" #include "libavutil/intreadwrite.h" #include "libavutil/dict.h" #include "avformat.h" #include "demux.h" #include "internal.h" #define FORM_TAG MKTAG('F', 'O', 'R', 'M') #define MOVE_TAG MKTAG('M', 'O', 'V', 'E') #define PC__TAG MKTAG('_', 'P', 'C', '_') #define SOND_TAG MKTAG('S', 'O', 'N', 'D') #define BNAM_TAG MKTAG('B', 'N', 'A', 'M') #define SIZE_TAG MKTAG('S', 'I', 'Z', 'E') #define PALT_TAG MKTAG('P', 'A', 'L', 'T') #define INDX_TAG MKTAG('I', 'N', 'D', 'X') #define BRCH_TAG MKTAG('B', 'R', 'C', 'H') #define SHOT_TAG MKTAG('S', 'H', 'O', 'T') #define VGA__TAG MKTAG('V', 'G', 'A', ' ') #define TEXT_TAG MKTAG('T', 'E', 'X', 'T') #define AUDI_TAG MKTAG('A', 'U', 'D', 'I') /* video resolution unless otherwise specified */ #define WC3_DEFAULT_WIDTH 320 #define WC3_DEFAULT_HEIGHT 165 /* always use the same PCM audio parameters */ #define WC3_SAMPLE_RATE 22050 #define WC3_AUDIO_BITS 16 /* nice, constant framerate */ #define WC3_FRAME_FPS 15 #define PALETTE_SIZE (256 * 3) typedef struct Wc3DemuxContext { int width; int height; int64_t pts; int video_stream_index; int audio_stream_index; AVPacket *vpkt; } Wc3DemuxContext; static int wc3_read_close(AVFormatContext *s) { Wc3DemuxContext *wc3 = s->priv_data; av_packet_free(&wc3->vpkt); return 0; } static int wc3_probe(const AVProbeData *p) { if (p->buf_size < 12) return 0; if ((AV_RL32(&p->buf[0]) != FORM_TAG) || (AV_RL32(&p->buf[8]) != MOVE_TAG)) return 0; return AVPROBE_SCORE_MAX; } static int wc3_read_header(AVFormatContext *s) { Wc3DemuxContext *wc3 = s->priv_data; AVIOContext *pb = s->pb; unsigned int fourcc_tag; unsigned int size; AVStream *st; int ret = 0; char *buffer; /* default context members */ wc3->width = WC3_DEFAULT_WIDTH; wc3->height = WC3_DEFAULT_HEIGHT; wc3->pts = 0; wc3->video_stream_index = wc3->audio_stream_index = 0; wc3->vpkt = av_packet_alloc(); if (!wc3->vpkt) return AVERROR(ENOMEM); /* skip the first 3 32-bit numbers */ avio_skip(pb, 12); /* traverse through the chunks and load the header information before * the first BRCH tag */ fourcc_tag = avio_rl32(pb); size = (avio_rb32(pb) + 1) & (~1); do { switch (fourcc_tag) { case SOND_TAG: case INDX_TAG: /* SOND unknown, INDX unnecessary; ignore both */ avio_skip(pb, size); break; case PC__TAG: /* number of palettes, unneeded */ avio_skip(pb, 12); break; case BNAM_TAG: /* load up the name */ buffer = av_malloc(size+1); if (!buffer) return AVERROR(ENOMEM); if ((ret = avio_read(pb, buffer, size)) != size) { av_freep(&buffer); return AVERROR(EIO); } buffer[size] = 0; av_dict_set(&s->metadata, "title", buffer, AV_DICT_DONT_STRDUP_VAL); break; case SIZE_TAG: /* video resolution override */ wc3->width = avio_rl32(pb); wc3->height = avio_rl32(pb); break; case PALT_TAG: /* one of several palettes */ avio_seek(pb, -8, SEEK_CUR); av_append_packet(pb, wc3->vpkt, 8 + PALETTE_SIZE); break; default: av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n", av_fourcc2str(fourcc_tag)); return AVERROR_INVALIDDATA; } fourcc_tag = avio_rl32(pb); /* chunk sizes are 16-bit aligned */ size = (avio_rb32(pb) + 1) & (~1); if (avio_feof(pb)) return AVERROR(EIO); } while (fourcc_tag != BRCH_TAG); /* initialize the decoder streams */ st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS); wc3->video_stream_index = st->index; st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_XAN_WC3; st->codecpar->codec_tag = 0; /* no fourcc */ st->codecpar->width = wc3->width; st->codecpar->height = wc3->height; st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avpriv_set_pts_info(st, 33, 1, WC3_FRAME_FPS); wc3->audio_stream_index = st->index; st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE; st->codecpar->codec_tag = 1; st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS; st->codecpar->sample_rate = WC3_SAMPLE_RATE; st->codecpar->bit_rate = st->codecpar->ch_layout.nb_channels * st->codecpar->sample_rate * st->codecpar->bits_per_coded_sample; st->codecpar->block_align = WC3_AUDIO_BITS * st->codecpar->ch_layout.nb_channels; return 0; } static int wc3_read_packet(AVFormatContext *s, AVPacket *pkt) { Wc3DemuxContext *wc3 = s->priv_data; AVIOContext *pb = s->pb; unsigned int fourcc_tag; unsigned int size; int packet_read = 0; int ret = 0; unsigned char text[1024]; while (!packet_read) { fourcc_tag = avio_rl32(pb); /* chunk sizes are 16-bit aligned */ size = (avio_rb32(pb) + 1) & (~1); if (avio_feof(pb)) return AVERROR(EIO); switch (fourcc_tag) { case BRCH_TAG: /* no-op */ break; case SHOT_TAG: /* load up new palette */ avio_seek(pb, -8, SEEK_CUR); av_append_packet(pb, wc3->vpkt, 8 + 4); break; case VGA__TAG: /* send out video chunk */ avio_seek(pb, -8, SEEK_CUR); ret= av_append_packet(pb, wc3->vpkt, 8 + size); // ignore error if we have some data if (wc3->vpkt->size > 0) ret = 0; av_packet_move_ref(pkt, wc3->vpkt); pkt->stream_index = wc3->video_stream_index; pkt->pts = wc3->pts; packet_read = 1; break; case TEXT_TAG: /* subtitle chunk */ if ((unsigned)size > sizeof(text) || (ret = avio_read(pb, text, size)) != size) ret = AVERROR(EIO); else { int i = 0; av_log (s, AV_LOG_DEBUG, "Subtitle time!\n"); if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) return AVERROR_INVALIDDATA; av_log (s, AV_LOG_DEBUG, " inglish: %s\n", &text[i + 1]); i += text[i] + 1; if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) return AVERROR_INVALIDDATA; av_log (s, AV_LOG_DEBUG, " doytsch: %s\n", &text[i + 1]); i += text[i] + 1; if (i >= size || av_strnlen(&text[i + 1], size - i - 1) >= size - i - 1) return AVERROR_INVALIDDATA; av_log (s, AV_LOG_DEBUG, " fronsay: %s\n", &text[i + 1]); } break; case AUDI_TAG: /* send out audio chunk */ ret= av_get_packet(pb, pkt, size); pkt->stream_index = wc3->audio_stream_index; pkt->pts = wc3->pts; /* time to advance pts */ wc3->pts++; packet_read = 1; break; default: av_log(s, AV_LOG_ERROR, "unrecognized WC3 chunk: %s\n", av_fourcc2str(fourcc_tag)); ret = AVERROR_INVALIDDATA; packet_read = 1; break; } } return ret; } const FFInputFormat ff_wc3_demuxer = { .p.name = "wc3movie", .p.long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"), .priv_data_size = sizeof(Wc3DemuxContext), .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, .read_probe = wc3_probe, .read_header = wc3_read_header, .read_packet = wc3_read_packet, .read_close = wc3_read_close, };