| /* | |
| * Sierra VMD Format Demuxer | |
| * Copyright (c) 2004 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 | |
| * Sierra VMD file demuxer | |
| * by Vladimir "VAG" Gneushev (vagsoft at mail.ru) | |
| * for more information on the Sierra VMD file format, visit: | |
| * http://www.pcisys.net/~melanson/codecs/ | |
| */ | |
| #include "libavutil/channel_layout.h" | |
| #include "libavutil/intreadwrite.h" | |
| #include "avformat.h" | |
| #include "demux.h" | |
| #include "internal.h" | |
| #include "avio_internal.h" | |
| #define VMD_HEADER_SIZE 0x0330 | |
| #define BYTES_PER_FRAME_RECORD 16 | |
| typedef struct vmd_frame { | |
| int stream_index; | |
| unsigned int frame_size; | |
| int64_t frame_offset; | |
| int64_t pts; | |
| unsigned char frame_record[BYTES_PER_FRAME_RECORD]; | |
| } vmd_frame; | |
| typedef struct VmdDemuxContext { | |
| int video_stream_index; | |
| int audio_stream_index; | |
| unsigned int frame_count; | |
| unsigned int frames_per_block; | |
| vmd_frame *frame_table; | |
| unsigned int current_frame; | |
| int is_indeo3; | |
| int sample_rate; | |
| int64_t audio_sample_counter; | |
| int skiphdr; | |
| unsigned char vmd_header[VMD_HEADER_SIZE]; | |
| } VmdDemuxContext; | |
| static int vmd_probe(const AVProbeData *p) | |
| { | |
| int w, h, sample_rate; | |
| if (p->buf_size < 806) | |
| return 0; | |
| /* check if the first 2 bytes of the file contain the appropriate size | |
| * of a VMD header chunk */ | |
| if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2) | |
| return 0; | |
| w = AV_RL16(&p->buf[12]); | |
| h = AV_RL16(&p->buf[14]); | |
| sample_rate = AV_RL16(&p->buf[804]); | |
| if ((!w || w > 2048 || !h || h > 2048) && | |
| sample_rate != 22050) | |
| return 0; | |
| /* only return half certainty since this check is a bit sketchy */ | |
| return AVPROBE_SCORE_EXTENSION; | |
| } | |
| static int vmd_read_header(AVFormatContext *s) | |
| { | |
| VmdDemuxContext *vmd = s->priv_data; | |
| AVIOContext *pb = s->pb; | |
| AVStream *st = NULL, *vst = NULL; | |
| unsigned int toc_offset; | |
| unsigned char *raw_frame_table; | |
| int raw_frame_table_size; | |
| int64_t current_offset; | |
| int i, j, ret; | |
| int width, height; | |
| unsigned int total_frames; | |
| int64_t current_audio_pts = 0; | |
| unsigned char chunk[BYTES_PER_FRAME_RECORD]; | |
| int num, den; | |
| int sound_buffers; | |
| /* fetch the main header, including the 2 header length bytes */ | |
| avio_seek(pb, 0, SEEK_SET); | |
| if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE) | |
| return AVERROR(EIO); | |
| width = AV_RL16(&vmd->vmd_header[12]); | |
| height = AV_RL16(&vmd->vmd_header[14]); | |
| if (width && height) { | |
| if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') { | |
| vmd->is_indeo3 = 1; | |
| } else { | |
| vmd->is_indeo3 = 0; | |
| } | |
| /* start up the decoders */ | |
| vst = avformat_new_stream(s, NULL); | |
| if (!vst) | |
| return AVERROR(ENOMEM); | |
| avpriv_set_pts_info(vst, 33, 1, 10); | |
| vmd->video_stream_index = vst->index; | |
| vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO; | |
| vst->codecpar->codec_tag = 0; /* no fourcc */ | |
| vst->codecpar->width = width; | |
| vst->codecpar->height = height; | |
| if(vmd->is_indeo3 && vst->codecpar->width > 320){ | |
| vst->codecpar->width >>= 1; | |
| vst->codecpar->height >>= 1; | |
| } | |
| if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0) | |
| return ret; | |
| memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE); | |
| } | |
| /* if sample rate is 0, assume no audio */ | |
| vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]); | |
| if (vmd->sample_rate) { | |
| int channels; | |
| st = avformat_new_stream(s, NULL); | |
| if (!st) | |
| return AVERROR(ENOMEM); | |
| vmd->audio_stream_index = st->index; | |
| st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| st->codecpar->codec_id = AV_CODEC_ID_VMDAUDIO; | |
| st->codecpar->codec_tag = 0; /* no fourcc */ | |
| st->codecpar->sample_rate = vmd->sample_rate; | |
| st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]); | |
| if (st->codecpar->block_align & 0x8000) { | |
| st->codecpar->bits_per_coded_sample = 16; | |
| st->codecpar->block_align = -(st->codecpar->block_align - 0x10000); | |
| } else { | |
| st->codecpar->bits_per_coded_sample = 8; | |
| } | |
| if (vmd->vmd_header[811] & 0x80) { | |
| channels = 2; | |
| } else if (vmd->vmd_header[811] & 0x2) { | |
| /* Shivers 2 stereo audio */ | |
| /* Frame length is for 1 channel */ | |
| channels = 2; | |
| st->codecpar->block_align = st->codecpar->block_align << 1; | |
| } else { | |
| channels = 1; | |
| } | |
| av_channel_layout_default(&st->codecpar->ch_layout, channels); | |
| st->codecpar->bit_rate = st->codecpar->sample_rate * | |
| st->codecpar->bits_per_coded_sample * channels; | |
| /* calculate pts */ | |
| num = st->codecpar->block_align; | |
| den = st->codecpar->sample_rate * channels; | |
| av_reduce(&num, &den, num, den, (1UL<<31)-1); | |
| if (vst) | |
| avpriv_set_pts_info(vst, 33, num, den); | |
| avpriv_set_pts_info(st, 33, num, den); | |
| } | |
| if (!s->nb_streams) | |
| return AVERROR_INVALIDDATA; | |
| toc_offset = AV_RL32(&vmd->vmd_header[812]); | |
| vmd->frame_count = AV_RL16(&vmd->vmd_header[6]); | |
| vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]); | |
| avio_seek(pb, toc_offset, SEEK_SET); | |
| raw_frame_table = NULL; | |
| vmd->frame_table = NULL; | |
| sound_buffers = AV_RL16(&vmd->vmd_header[808]); | |
| raw_frame_table_size = vmd->frame_count * 6; | |
| raw_frame_table = av_malloc(raw_frame_table_size); | |
| vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame)); | |
| if (!raw_frame_table || !vmd->frame_table) { | |
| ret = AVERROR(ENOMEM); | |
| goto error; | |
| } | |
| if (avio_read(pb, raw_frame_table, raw_frame_table_size) != | |
| raw_frame_table_size) { | |
| ret = AVERROR(EIO); | |
| goto error; | |
| } | |
| total_frames = 0; | |
| for (i = 0; i < vmd->frame_count; i++) { | |
| current_offset = AV_RL32(&raw_frame_table[6 * i + 2]); | |
| /* handle each entry in index block */ | |
| for (j = 0; j < vmd->frames_per_block; j++) { | |
| int type; | |
| uint32_t size; | |
| if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) { | |
| av_log(s, AV_LOG_ERROR, "Failed to read frame record\n"); | |
| if (ret >= 0) | |
| ret = AVERROR_INVALIDDATA; | |
| goto error; | |
| } | |
| type = chunk[0]; | |
| size = AV_RL32(&chunk[2]); | |
| if (size > INT_MAX / 2) { | |
| av_log(s, AV_LOG_ERROR, "Invalid frame size\n"); | |
| ret = AVERROR_INVALIDDATA; | |
| goto error; | |
| } | |
| if(!size && type != 1) | |
| continue; | |
| switch(type) { | |
| case 1: /* Audio Chunk */ | |
| if (!st) break; | |
| /* first audio chunk contains several audio buffers */ | |
| vmd->frame_table[total_frames].frame_offset = current_offset; | |
| vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index; | |
| vmd->frame_table[total_frames].frame_size = size; | |
| memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); | |
| vmd->frame_table[total_frames].pts = current_audio_pts; | |
| total_frames++; | |
| if(!current_audio_pts) | |
| current_audio_pts += sound_buffers - 1; | |
| else | |
| current_audio_pts++; | |
| break; | |
| case 2: /* Video Chunk */ | |
| if (!vst) | |
| break; | |
| vmd->frame_table[total_frames].frame_offset = current_offset; | |
| vmd->frame_table[total_frames].stream_index = vmd->video_stream_index; | |
| vmd->frame_table[total_frames].frame_size = size; | |
| memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); | |
| vmd->frame_table[total_frames].pts = i; | |
| total_frames++; | |
| break; | |
| } | |
| current_offset += size; | |
| } | |
| } | |
| vmd->current_frame = 0; | |
| vmd->frame_count = total_frames; | |
| ret = 0; | |
| error: | |
| av_freep(&raw_frame_table); | |
| return ret; | |
| } | |
| static int vmd_read_packet(AVFormatContext *s, | |
| AVPacket *pkt) | |
| { | |
| VmdDemuxContext *vmd = s->priv_data; | |
| AVIOContext *pb = s->pb; | |
| int ret = 0; | |
| vmd_frame *frame; | |
| if (vmd->current_frame >= vmd->frame_count) | |
| return AVERROR_EOF; | |
| frame = &vmd->frame_table[vmd->current_frame]; | |
| /* position the stream (will probably be there already) */ | |
| avio_seek(pb, frame->frame_offset, SEEK_SET); | |
| if(ffio_limit(pb, frame->frame_size) != frame->frame_size) | |
| return AVERROR(EIO); | |
| ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD); | |
| if (ret < 0) | |
| return ret; | |
| pkt->pos= avio_tell(pb); | |
| memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD); | |
| if(vmd->is_indeo3 && frame->frame_record[0] == 0x02) | |
| ret = avio_read(pb, pkt->data, frame->frame_size); | |
| else | |
| ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD, | |
| frame->frame_size); | |
| if (ret != frame->frame_size) { | |
| ret = AVERROR(EIO); | |
| } | |
| pkt->stream_index = frame->stream_index; | |
| pkt->pts = frame->pts; | |
| av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n", | |
| (frame->frame_record[0] == 0x02) ? "video" : "audio", | |
| frame->frame_size + BYTES_PER_FRAME_RECORD, | |
| pkt->pts); | |
| vmd->current_frame++; | |
| return ret; | |
| } | |
| static int vmd_read_close(AVFormatContext *s) | |
| { | |
| VmdDemuxContext *vmd = s->priv_data; | |
| av_freep(&vmd->frame_table); | |
| return 0; | |
| } | |
| const FFInputFormat ff_vmd_demuxer = { | |
| .p.name = "vmd", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"), | |
| .priv_data_size = sizeof(VmdDemuxContext), | |
| .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP, | |
| .read_probe = vmd_probe, | |
| .read_header = vmd_read_header, | |
| .read_packet = vmd_read_packet, | |
| .read_close = vmd_read_close, | |
| }; |