| /* |
| * Bethsoft VID format Demuxer |
| * Copyright (c) 2007 Nicholas Tung |
| * |
| * 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 |
| * @brief Bethesda Softworks VID (.vid) file demuxer |
| * @author Nicholas Tung [ntung (at. ntung com] (2007-03) |
| * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID |
| * @see http://www.svatopluk.com/andux/docs/dfvid.html |
| */ |
| |
| #include "libavutil/channel_layout.h" |
| #include "libavutil/intreadwrite.h" |
| #include "avformat.h" |
| #include "internal.h" |
| #include "libavcodec/bethsoftvideo.h" |
| |
| #define BVID_PALETTE_SIZE 3 * 256 |
| |
| #define DEFAULT_SAMPLE_RATE 11111 |
| |
| typedef struct BVID_DemuxContext |
| { |
| int nframes; |
| int sample_rate; /**< audio sample rate */ |
| int width; /**< video width */ |
| int height; /**< video height */ |
| /** delay value between frames, added to individual frame delay. |
| * custom units, which will be added to other custom units (~=16ms according |
| * to free, unofficial documentation) */ |
| int bethsoft_global_delay; |
| int video_index; /**< video stream index */ |
| int audio_index; /**< audio stream index */ |
| uint8_t *palette; |
| |
| int is_finished; |
| |
| } BVID_DemuxContext; |
| |
| static int vid_probe(AVProbeData *p) |
| { |
| // little-endian VID tag, file starts with "VID\0" |
| if (AV_RL32(p->buf) != MKTAG('V', 'I', 'D', 0)) |
| return 0; |
| |
| if (p->buf[4] != 2) |
| return AVPROBE_SCORE_MAX / 4; |
| |
| return AVPROBE_SCORE_MAX; |
| } |
| |
| static int vid_read_header(AVFormatContext *s) |
| { |
| BVID_DemuxContext *vid = s->priv_data; |
| AVIOContext *pb = s->pb; |
| |
| /* load main header. Contents: |
| * bytes: 'V' 'I' 'D' |
| * int16s: always_512, nframes, width, height, delay, always_14 |
| */ |
| avio_skip(pb, 5); |
| vid->nframes = avio_rl16(pb); |
| vid->width = avio_rl16(pb); |
| vid->height = avio_rl16(pb); |
| vid->bethsoft_global_delay = avio_rl16(pb); |
| avio_rl16(pb); |
| |
| // wait until the first packet to create each stream |
| vid->video_index = -1; |
| vid->audio_index = -1; |
| vid->sample_rate = DEFAULT_SAMPLE_RATE; |
| s->ctx_flags |= AVFMTCTX_NOHEADER; |
| |
| return 0; |
| } |
| |
| #define BUFFER_PADDING_SIZE 1000 |
| static int read_frame(BVID_DemuxContext *vid, AVIOContext *pb, AVPacket *pkt, |
| uint8_t block_type, AVFormatContext *s) |
| { |
| uint8_t * vidbuf_start = NULL; |
| int vidbuf_nbytes = 0; |
| int code; |
| int bytes_copied = 0; |
| int position, duration, npixels; |
| unsigned int vidbuf_capacity; |
| int ret = 0; |
| AVStream *st; |
| |
| if (vid->video_index < 0) { |
| st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| vid->video_index = st->index; |
| if (vid->audio_index < 0) { |
| avpriv_request_sample(s, "Using default video time base since " |
| "having no audio packet before the first " |
| "video packet"); |
| } |
| avpriv_set_pts_info(st, 64, 185, vid->sample_rate); |
| st->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| st->codec->codec_id = AV_CODEC_ID_BETHSOFTVID; |
| st->codec->width = vid->width; |
| st->codec->height = vid->height; |
| } |
| st = s->streams[vid->video_index]; |
| npixels = st->codec->width * st->codec->height; |
| |
| vidbuf_start = av_malloc(vidbuf_capacity = BUFFER_PADDING_SIZE); |
| if(!vidbuf_start) |
| return AVERROR(ENOMEM); |
| |
| // save the file position for the packet, include block type |
| position = avio_tell(pb) - 1; |
| |
| vidbuf_start[vidbuf_nbytes++] = block_type; |
| |
| // get the current packet duration |
| duration = vid->bethsoft_global_delay + avio_rl16(pb); |
| |
| // set the y offset if it exists (decoder header data should be in data section) |
| if(block_type == VIDEO_YOFF_P_FRAME){ |
| if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2) { |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| vidbuf_nbytes += 2; |
| } |
| |
| do{ |
| vidbuf_start = av_fast_realloc(vidbuf_start, &vidbuf_capacity, vidbuf_nbytes + BUFFER_PADDING_SIZE); |
| if(!vidbuf_start) |
| return AVERROR(ENOMEM); |
| |
| code = avio_r8(pb); |
| vidbuf_start[vidbuf_nbytes++] = code; |
| |
| if(code >= 0x80){ // rle sequence |
| if(block_type == VIDEO_I_FRAME) |
| vidbuf_start[vidbuf_nbytes++] = avio_r8(pb); |
| } else if(code){ // plain sequence |
| if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], code) != code) { |
| ret = AVERROR(EIO); |
| goto fail; |
| } |
| vidbuf_nbytes += code; |
| } |
| bytes_copied += code & 0x7F; |
| if(bytes_copied == npixels){ // sometimes no stop character is given, need to keep track of bytes copied |
| // may contain a 0 byte even if read all pixels |
| if(avio_r8(pb)) |
| avio_seek(pb, -1, SEEK_CUR); |
| break; |
| } |
| if (bytes_copied > npixels) { |
| ret = AVERROR_INVALIDDATA; |
| goto fail; |
| } |
| } while(code); |
| |
| // copy data into packet |
| if ((ret = av_new_packet(pkt, vidbuf_nbytes)) < 0) |
| goto fail; |
| memcpy(pkt->data, vidbuf_start, vidbuf_nbytes); |
| |
| pkt->pos = position; |
| pkt->stream_index = vid->video_index; |
| pkt->duration = duration; |
| if (block_type == VIDEO_I_FRAME) |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| |
| /* if there is a new palette available, add it to packet side data */ |
| if (vid->palette) { |
| uint8_t *pdata = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, |
| BVID_PALETTE_SIZE); |
| if (!pdata) { |
| ret = AVERROR(ENOMEM); |
| av_log(s, AV_LOG_ERROR, "Failed to allocate palette side data\n"); |
| goto fail; |
| } |
| memcpy(pdata, vid->palette, BVID_PALETTE_SIZE); |
| |
| av_freep(&vid->palette); |
| } |
| |
| vid->nframes--; // used to check if all the frames were read |
| fail: |
| av_free(vidbuf_start); |
| return ret; |
| } |
| |
| static int vid_read_packet(AVFormatContext *s, |
| AVPacket *pkt) |
| { |
| BVID_DemuxContext *vid = s->priv_data; |
| AVIOContext *pb = s->pb; |
| unsigned char block_type; |
| int audio_length; |
| int ret_value; |
| |
| if(vid->is_finished || avio_feof(pb)) |
| return AVERROR_EOF; |
| |
| block_type = avio_r8(pb); |
| switch(block_type){ |
| case PALETTE_BLOCK: |
| if (vid->palette) { |
| av_log(s, AV_LOG_WARNING, "discarding unused palette\n"); |
| av_freep(&vid->palette); |
| } |
| vid->palette = av_malloc(BVID_PALETTE_SIZE); |
| if (!vid->palette) |
| return AVERROR(ENOMEM); |
| if (avio_read(pb, vid->palette, BVID_PALETTE_SIZE) != BVID_PALETTE_SIZE) { |
| av_freep(&vid->palette); |
| return AVERROR(EIO); |
| } |
| return vid_read_packet(s, pkt); |
| |
| case FIRST_AUDIO_BLOCK: |
| avio_rl16(pb); |
| // soundblaster DAC used for sample rate, as on specification page (link above) |
| vid->sample_rate = 1000000 / (256 - avio_r8(pb)); |
| case AUDIO_BLOCK: |
| if (vid->audio_index < 0) { |
| AVStream *st = avformat_new_stream(s, NULL); |
| if (!st) |
| return AVERROR(ENOMEM); |
| vid->audio_index = st->index; |
| st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| st->codec->codec_id = AV_CODEC_ID_PCM_U8; |
| st->codec->channels = 1; |
| st->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| st->codec->bits_per_coded_sample = 8; |
| st->codec->sample_rate = vid->sample_rate; |
| st->codec->bit_rate = 8 * st->codec->sample_rate; |
| st->start_time = 0; |
| avpriv_set_pts_info(st, 64, 1, vid->sample_rate); |
| } |
| audio_length = avio_rl16(pb); |
| if ((ret_value = av_get_packet(pb, pkt, audio_length)) != audio_length) { |
| if (ret_value < 0) |
| return ret_value; |
| av_log(s, AV_LOG_ERROR, "incomplete audio block\n"); |
| return AVERROR(EIO); |
| } |
| pkt->stream_index = vid->audio_index; |
| pkt->duration = audio_length; |
| pkt->flags |= AV_PKT_FLAG_KEY; |
| return 0; |
| |
| case VIDEO_P_FRAME: |
| case VIDEO_YOFF_P_FRAME: |
| case VIDEO_I_FRAME: |
| return read_frame(vid, pb, pkt, block_type, s); |
| |
| case EOF_BLOCK: |
| if(vid->nframes != 0) |
| av_log(s, AV_LOG_VERBOSE, "reached terminating character but not all frames read.\n"); |
| vid->is_finished = 1; |
| return AVERROR(EIO); |
| default: |
| av_log(s, AV_LOG_ERROR, "unknown block (character = %c, decimal = %d, hex = %x)!!!\n", |
| block_type, block_type, block_type); |
| return AVERROR_INVALIDDATA; |
| } |
| } |
| |
| static int vid_read_close(AVFormatContext *s) |
| { |
| BVID_DemuxContext *vid = s->priv_data; |
| av_freep(&vid->palette); |
| return 0; |
| } |
| |
| AVInputFormat ff_bethsoftvid_demuxer = { |
| .name = "bethsoftvid", |
| .long_name = NULL_IF_CONFIG_SMALL("Bethesda Softworks VID"), |
| .priv_data_size = sizeof(BVID_DemuxContext), |
| .read_probe = vid_probe, |
| .read_header = vid_read_header, |
| .read_packet = vid_read_packet, |
| .read_close = vid_read_close, |
| }; |
