| /* |
| * 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 "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_CHANNELS 1 |
| #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; |
| |
| if (wc3->vpkt.size > 0) |
| av_packet_unref(&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; |
| av_init_packet(&wc3->vpkt); |
| wc3->vpkt.data = NULL; wc3->vpkt.size = 0; |
| |
| /* 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) |
| if (!buffer) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| if ((ret = avio_read(pb, buffer, size)) != size) { |
| av_freep(&buffer); |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| 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)); |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| |
| fourcc_tag = avio_rl32(pb); |
| /* chunk sizes are 16-bit aligned */ |
| size = (avio_rb32(pb) + 1) & (~1); |
| if (avio_feof(pb)) { |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| |
| } while (fourcc_tag != BRCH_TAG); |
| |
| /* initialize the decoder streams */ |
| st = avformat_new_stream(s, NULL); |
| if (!st) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| 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) { |
| ret = AVERROR(ENOMEM); |
| goto fail; |
| } |
| 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->channels = WC3_AUDIO_CHANNELS; |
| st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codecpar->bits_per_coded_sample = WC3_AUDIO_BITS; |
| st->codecpar->sample_rate = WC3_SAMPLE_RATE; |
| st->codecpar->bit_rate = st->codecpar->channels * st->codecpar->sample_rate * |
| st->codecpar->bits_per_coded_sample; |
| st->codecpar->block_align = WC3_AUDIO_BITS * WC3_AUDIO_CHANNELS; |
| |
| return 0; |
| fail: |
| wc3_read_close(s); |
| return ret; |
| } |
| |
| 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; |
| *pkt = wc3->vpkt; |
| wc3->vpkt.data = NULL; wc3->vpkt.size = 0; |
| 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; |
| } |
| |
| AVInputFormat ff_wc3_demuxer = { |
| .name = "wc3movie", |
| .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III movie"), |
| .priv_data_size = sizeof(Wc3DemuxContext), |
| .read_probe = wc3_probe, |
| .read_header = wc3_read_header, |
| .read_packet = wc3_read_packet, |
| .read_close = wc3_read_close, |
| }; |