diff options
Diffstat (limited to 'contrib/ffmpeg/libavformat/sierravmd.c')
| -rw-r--r-- | contrib/ffmpeg/libavformat/sierravmd.c | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavformat/sierravmd.c b/contrib/ffmpeg/libavformat/sierravmd.c new file mode 100644 index 000000000..3e1c8597d --- /dev/null +++ b/contrib/ffmpeg/libavformat/sierravmd.c @@ -0,0 +1,302 @@ +/* + * 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 sierravmd.c + * 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 "avformat.h" + +#define VMD_HEADER_SIZE 0x0330 +#define BYTES_PER_FRAME_RECORD 16 + +typedef struct { + int stream_index; + offset_t frame_offset; + unsigned int frame_size; + int64_t pts; + int keyframe; + unsigned char frame_record[BYTES_PER_FRAME_RECORD]; +} vmd_frame_t; + +typedef struct VmdDemuxContext { + int video_stream_index; + int audio_stream_index; + + unsigned int frame_count; + unsigned int frames_per_block; + vmd_frame_t *frame_table; + unsigned int current_frame; + + int sample_rate; + int64_t audio_sample_counter; + int skiphdr; + + unsigned char vmd_header[VMD_HEADER_SIZE]; +} VmdDemuxContext; + +static int vmd_probe(AVProbeData *p) +{ + if (p->buf_size < 2) + 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; + + /* only return half certainty since this check is a bit sketchy */ + return AVPROBE_SCORE_MAX / 2; +} + +static int vmd_read_header(AVFormatContext *s, + AVFormatParameters *ap) +{ + VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data; + ByteIOContext *pb = &s->pb; + AVStream *st, *vst; + unsigned int toc_offset; + unsigned char *raw_frame_table; + int raw_frame_table_size; + offset_t current_offset; + int i, j; + unsigned int total_frames; + int64_t pts_inc = 1; + int64_t current_video_pts = 0, 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 */ + url_fseek(pb, 0, SEEK_SET); + if (get_buffer(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE) + return AVERROR_IO; + + /* start up the decoders */ + vst = av_new_stream(s, 0); + if (!vst) + return AVERROR_NOMEM; + av_set_pts_info(vst, 33, 1, 10); + vmd->video_stream_index = vst->index; + vst->codec->codec_type = CODEC_TYPE_VIDEO; + vst->codec->codec_id = CODEC_ID_VMDVIDEO; + vst->codec->codec_tag = 0; /* no fourcc */ + vst->codec->width = AV_RL16(&vmd->vmd_header[12]); + vst->codec->height = AV_RL16(&vmd->vmd_header[14]); + vst->codec->extradata_size = VMD_HEADER_SIZE; + vst->codec->extradata = av_mallocz(VMD_HEADER_SIZE + FF_INPUT_BUFFER_PADDING_SIZE); + memcpy(vst->codec->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) { + st = av_new_stream(s, 0); + if (!st) + return AVERROR_NOMEM; + vmd->audio_stream_index = st->index; + st->codec->codec_type = CODEC_TYPE_AUDIO; + st->codec->codec_id = CODEC_ID_VMDAUDIO; + st->codec->codec_tag = 0; /* no fourcc */ + st->codec->channels = (vmd->vmd_header[811] & 0x80) ? 2 : 1; + st->codec->sample_rate = vmd->sample_rate; + st->codec->block_align = AV_RL16(&vmd->vmd_header[806]); + if (st->codec->block_align & 0x8000) { + st->codec->bits_per_sample = 16; + st->codec->block_align = -(st->codec->block_align - 0x10000); + } else { + st->codec->bits_per_sample = 8; + } + st->codec->bit_rate = st->codec->sample_rate * + st->codec->bits_per_sample * st->codec->channels; + + /* calculate pts */ + num = st->codec->block_align; + den = st->codec->sample_rate * st->codec->channels; + av_reduce(&den, &num, den, num, (1UL<<31)-1); + av_set_pts_info(vst, 33, num, den); + av_set_pts_info(st, 33, num, den); + pts_inc = num; + } + + 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]); + url_fseek(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); + if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame_t)){ + av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n"); + return -1; + } + vmd->frame_table = av_malloc((vmd->frame_count * vmd->frames_per_block + sound_buffers) * sizeof(vmd_frame_t)); + if (!raw_frame_table || !vmd->frame_table) { + av_free(raw_frame_table); + av_free(vmd->frame_table); + return AVERROR_NOMEM; + } + if (get_buffer(pb, raw_frame_table, raw_frame_table_size) != + raw_frame_table_size) { + av_free(raw_frame_table); + av_free(vmd->frame_table); + return AVERROR_IO; + } + + 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; + + get_buffer(pb, chunk, BYTES_PER_FRAME_RECORD); + type = chunk[0]; + size = AV_RL32(&chunk[2]); + if(!size) + continue; + switch(type) { + case 1: /* Audio Chunk */ + /* first audio chunk contains several audio buffers */ + if(current_audio_pts){ + 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++; + current_audio_pts += pts_inc; + }else{ + uint32_t flags; + int k; + int noff; + int64_t pos; + + pos = url_ftell(pb); + url_fseek(pb, current_offset, SEEK_SET); + flags = get_le32(pb); + noff = 4; + url_fseek(pb, pos, SEEK_SET); + av_log(s, AV_LOG_DEBUG, "Sound mapping = %08X (%i bufs)\n", flags, sound_buffers); + for(k = 0; k < sound_buffers - 1; k++){ + if(flags & 1) { /* silent block */ + vmd->frame_table[total_frames].frame_size = 0; + }else{ + vmd->frame_table[total_frames].frame_size = st->codec->block_align + (st->codec->block_align & 1); + } + noff += vmd->frame_table[total_frames].frame_size; + vmd->frame_table[total_frames].frame_offset = current_offset + noff; + vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index; + memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD); + vmd->frame_table[total_frames].pts = current_audio_pts; + total_frames++; + current_audio_pts += pts_inc; + flags >>= 1; + } + } + break; + case 2: /* Video Chunk */ + 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 = current_video_pts; + total_frames++; + break; + } + current_offset += size; + } + current_video_pts += pts_inc; + } + + av_free(raw_frame_table); + + vmd->current_frame = 0; + vmd->frame_count = total_frames; + + return 0; +} + +static int vmd_read_packet(AVFormatContext *s, + AVPacket *pkt) +{ + VmdDemuxContext *vmd = (VmdDemuxContext *)s->priv_data; + ByteIOContext *pb = &s->pb; + int ret = 0; + vmd_frame_t *frame; + + if (vmd->current_frame >= vmd->frame_count) + return AVERROR_IO; + + frame = &vmd->frame_table[vmd->current_frame]; + /* position the stream (will probably be there already) */ + url_fseek(pb, frame->frame_offset, SEEK_SET); + + if (av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD)) + return AVERROR_NOMEM; + pkt->pos= url_ftell(pb); + memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD); + ret = get_buffer(pb, pkt->data + BYTES_PER_FRAME_RECORD, + frame->frame_size); + + if (ret != frame->frame_size) { + av_free_packet(pkt); + ret = AVERROR_IO; + } + pkt->stream_index = frame->stream_index; + pkt->pts = frame->pts; + av_log(NULL, AV_LOG_INFO, " 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 = (VmdDemuxContext *)s->priv_data; + + av_free(vmd->frame_table); + + return 0; +} + +AVInputFormat vmd_demuxer = { + "vmd", + "Sierra VMD format", + sizeof(VmdDemuxContext), + vmd_probe, + vmd_read_header, + vmd_read_packet, + vmd_read_close, +}; |