FFmpeg: libavformat/sierravmd.c Source File

00001 /*
00002  * Sierra VMD Format Demuxer
00003  * Copyright (c) 2004 The ffmpeg Project
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00030 #include "libavutil/channel_layout.h"
00031 #include "libavutil/intreadwrite.h"
00032 #include "avformat.h"
00033 #include "internal.h"
00034 #include "avio_internal.h"
00035 
00036 #define VMD_HEADER_SIZE 0x0330
00037 #define BYTES_PER_FRAME_RECORD 16
00038 
00039 typedef struct {
00040   int stream_index;
00041   int64_t frame_offset;
00042   unsigned int frame_size;
00043   int64_t pts;
00044   int keyframe;
00045   unsigned char frame_record[BYTES_PER_FRAME_RECORD];
00046 } vmd_frame;
00047 
00048 typedef struct VmdDemuxContext {
00049     int video_stream_index;
00050     int audio_stream_index;
00051 
00052     unsigned int frame_count;
00053     unsigned int frames_per_block;
00054     vmd_frame *frame_table;
00055     unsigned int current_frame;
00056     int is_indeo3;
00057 
00058     int sample_rate;
00059     int64_t audio_sample_counter;
00060     int skiphdr;
00061 
00062     unsigned char vmd_header[VMD_HEADER_SIZE];
00063 } VmdDemuxContext;
00064 
00065 static int vmd_probe(AVProbeData *p)
00066 {
00067     int w, h;
00068     if (p->buf_size < 16)
00069         return 0;
00070     /* check if the first 2 bytes of the file contain the appropriate size
00071      * of a VMD header chunk */
00072     if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
00073         return 0;
00074     w = AV_RL16(&p->buf[12]);
00075     h = AV_RL16(&p->buf[14]);
00076     if (!w || w > 2048 || !h || h > 2048)
00077         return 0;
00078 
00079     /* only return half certainty since this check is a bit sketchy */
00080     return AVPROBE_SCORE_MAX / 2;
00081 }
00082 
00083 static int vmd_read_header(AVFormatContext *s)
00084 {
00085     VmdDemuxContext *vmd = s->priv_data;
00086     AVIOContext *pb = s->pb;
00087     AVStream *st = NULL, *vst;
00088     unsigned int toc_offset;
00089     unsigned char *raw_frame_table;
00090     int raw_frame_table_size;
00091     int64_t current_offset;
00092     int i, j;
00093     unsigned int total_frames;
00094     int64_t current_audio_pts = 0;
00095     unsigned char chunk[BYTES_PER_FRAME_RECORD];
00096     int num, den;
00097     int sound_buffers;
00098 
00099     /* fetch the main header, including the 2 header length bytes */
00100     avio_seek(pb, 0, SEEK_SET);
00101     if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
00102         return AVERROR(EIO);
00103 
00104     if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3')
00105         vmd->is_indeo3 = 1;
00106     else
00107         vmd->is_indeo3 = 0;
00108     /* start up the decoders */
00109     vst = avformat_new_stream(s, NULL);
00110     if (!vst)
00111         return AVERROR(ENOMEM);
00112     avpriv_set_pts_info(vst, 33, 1, 10);
00113     vmd->video_stream_index = vst->index;
00114     vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
00115     vst->codec->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
00116     vst->codec->codec_tag = 0;  /* no fourcc */
00117     vst->codec->width = AV_RL16(&vmd->vmd_header[12]);
00118     vst->codec->height = AV_RL16(&vmd->vmd_header[14]);
00119     if(vmd->is_indeo3 && vst->codec->width > 320){
00120         vst->codec->width >>= 1;
00121         vst->codec->height >>= 1;
00122     }
00123     vst->codec->extradata_size = VMD_HEADER_SIZE;
00124     vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE);
00125     memcpy(vst->codec->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
00126 
00127     /* if sample rate is 0, assume no audio */
00128     vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
00129     if (vmd->sample_rate) {
00130         st = avformat_new_stream(s, NULL);
00131         if (!st)
00132             return AVERROR(ENOMEM);
00133         vmd->audio_stream_index = st->index;
00134         st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
00135         st->codec->codec_id = AV_CODEC_ID_VMDAUDIO;
00136         st->codec->codec_tag = 0;  /* no fourcc */
00137         if (vmd->vmd_header[811] & 0x80) {
00138             st->codec->channels       = 2;
00139             st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
00140         } else {
00141             st->codec->channels       = 1;
00142             st->codec->channel_layout = AV_CH_LAYOUT_MONO;
00143         }
00144         st->codec->sample_rate = vmd->sample_rate;
00145         st->codec->block_align = AV_RL16(&vmd->vmd_header[806]);
00146         if (st->codec->block_align & 0x8000) {
00147             st->codec->bits_per_coded_sample = 16;
00148             st->codec->block_align = -(st->codec->block_align - 0x10000);
00149         } else {
00150             st->codec->bits_per_coded_sample = 8;
00151         }
00152         st->codec->bit_rate = st->codec->sample_rate *
00153             st->codec->bits_per_coded_sample * st->codec->channels;
00154 
00155         /* calculate pts */
00156         num = st->codec->block_align;
00157         den = st->codec->sample_rate * st->codec->channels;
00158         av_reduce(&num, &den, num, den, (1UL<<31)-1);
00159         avpriv_set_pts_info(vst, 33, num, den);
00160         avpriv_set_pts_info(st, 33, num, den);
00161     }
00162 
00163     toc_offset = AV_RL32(&vmd->vmd_header[812]);
00164     vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
00165     vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
00166     avio_seek(pb, toc_offset, SEEK_SET);
00167 
00168     raw_frame_table = NULL;
00169     vmd->frame_table = NULL;
00170     sound_buffers = AV_RL16(&vmd->vmd_header[808]);
00171     raw_frame_table_size = vmd->frame_count * 6;
00172     if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
00173         av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
00174         return -1;
00175     }
00176     raw_frame_table = av_malloc(raw_frame_table_size);
00177     vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame));
00178     if (!raw_frame_table || !vmd->frame_table) {
00179         av_free(raw_frame_table);
00180         av_free(vmd->frame_table);
00181         return AVERROR(ENOMEM);
00182     }
00183     if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
00184         raw_frame_table_size) {
00185         av_free(raw_frame_table);
00186         av_free(vmd->frame_table);
00187         return AVERROR(EIO);
00188     }
00189 
00190     total_frames = 0;
00191     for (i = 0; i < vmd->frame_count; i++) {
00192 
00193         current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
00194 
00195         /* handle each entry in index block */
00196         for (j = 0; j < vmd->frames_per_block; j++) {
00197             int type;
00198             uint32_t size;
00199 
00200             avio_read(pb, chunk, BYTES_PER_FRAME_RECORD);
00201             type = chunk[0];
00202             size = AV_RL32(&chunk[2]);
00203             if(!size && type != 1)
00204                 continue;
00205             switch(type) {
00206             case 1: /* Audio Chunk */
00207                 if (!st) break;
00208                 /* first audio chunk contains several audio buffers */
00209                 vmd->frame_table[total_frames].frame_offset = current_offset;
00210                 vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
00211                 vmd->frame_table[total_frames].frame_size = size;
00212                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
00213                 vmd->frame_table[total_frames].pts = current_audio_pts;
00214                 total_frames++;
00215                 if(!current_audio_pts)
00216                     current_audio_pts += sound_buffers - 1;
00217                 else
00218                     current_audio_pts++;
00219                 break;
00220             case 2: /* Video Chunk */
00221                 vmd->frame_table[total_frames].frame_offset = current_offset;
00222                 vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
00223                 vmd->frame_table[total_frames].frame_size = size;
00224                 memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
00225                 vmd->frame_table[total_frames].pts = i;
00226                 total_frames++;
00227                 break;
00228             }
00229             current_offset += size;
00230         }
00231     }
00232 
00233     av_free(raw_frame_table);
00234 
00235     vmd->current_frame = 0;
00236     vmd->frame_count = total_frames;
00237 
00238     return 0;
00239 }
00240 
00241 static int vmd_read_packet(AVFormatContext *s,
00242                            AVPacket *pkt)
00243 {
00244     VmdDemuxContext *vmd = s->priv_data;
00245     AVIOContext *pb = s->pb;
00246     int ret = 0;
00247     vmd_frame *frame;
00248 
00249     if (vmd->current_frame >= vmd->frame_count)
00250         return AVERROR_EOF;
00251 
00252     frame = &vmd->frame_table[vmd->current_frame];
00253     /* position the stream (will probably be there already) */
00254     avio_seek(pb, frame->frame_offset, SEEK_SET);
00255 
00256     if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
00257         return AVERROR(EIO);
00258     if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD))
00259         return AVERROR(ENOMEM);
00260     pkt->pos= avio_tell(pb);
00261     memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
00262     if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
00263         ret = avio_read(pb, pkt->data, frame->frame_size);
00264     else
00265         ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
00266             frame->frame_size);
00267 
00268     if (ret != frame->frame_size) {
00269         av_free_packet(pkt);
00270         ret = AVERROR(EIO);
00271     }
00272     pkt->stream_index = frame->stream_index;
00273     pkt->pts = frame->pts;
00274     av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
00275             (frame->frame_record[0] == 0x02) ? "video" : "audio",
00276             frame->frame_size + BYTES_PER_FRAME_RECORD,
00277             pkt->pts);
00278 
00279     vmd->current_frame++;
00280 
00281     return ret;
00282 }
00283 
00284 static int vmd_read_close(AVFormatContext *s)
00285 {
00286     VmdDemuxContext *vmd = s->priv_data;
00287 
00288     av_free(vmd->frame_table);
00289 
00290     return 0;
00291 }
00292 
00293 AVInputFormat ff_vmd_demuxer = {
00294     .name           = "vmd",
00295     .long_name      = NULL_IF_CONFIG_SMALL("Sierra VMD"),
00296     .priv_data_size = sizeof(VmdDemuxContext),
00297     .read_probe     = vmd_probe,
00298     .read_header    = vmd_read_header,
00299     .read_packet    = vmd_read_packet,
00300     .read_close     = vmd_read_close,
00301 };