X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fmtv.c;h=2af9c2dd5669658fa994b04ba3891a5d6b187571;hb=c9024a9fd7ea7980f876a65816da8da78dd9d88d;hp=55800867e8931227151a71172d13674420499733;hpb=e42dba481f6e552539ed8ce1a164024f68667943;p=ffmpeg diff --git a/libavformat/mtv.c b/libavformat/mtv.c index 55800867e89..2af9c2dd566 100644 --- a/libavformat/mtv.c +++ b/libavformat/mtv.c @@ -2,164 +2,189 @@ * mtv demuxer * Copyright (c) 2006 Reynaldo H. Verdejo Pinochet * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** - * @file mtv.c + * @file * MTV demuxer. */ +#include "libavutil/bswap.h" +#include "libavutil/intreadwrite.h" #include "avformat.h" -#include "bswap.h" +#include "internal.h" #define MTV_ASUBCHUNK_DATA_SIZE 500 #define MTV_HEADER_SIZE 512 #define MTV_AUDIO_PADDING_SIZE 12 #define AUDIO_SAMPLING_RATE 44100 -#define VIDEO_SID 0 -#define AUDIO_SID 1 typedef struct MTVDemuxContext { - unsigned int file_size; ///< filesize, not always right - unsigned int segments; ///< number of 512 byte segments - unsigned int audio_identifier; ///< 'MP3' on all files I have seen - unsigned int audio_br; ///< bitrate of audio chanel (mp3) - unsigned int img_colorfmt; ///< frame colorfmt rgb 565/555 - unsigned int img_bpp; ///< frame bits per pixel - unsigned int img_width; // - unsigned int img_height; // - unsigned int img_segment_size; ///< size of image segment - unsigned int video_fps; // - unsigned int audio_subsegments; ///< audio subsegments on one segment - - uint8_t audio_packet_count; + unsigned int file_size; ///< filesize, not always right + unsigned int segments; ///< number of 512 byte segments + unsigned int audio_identifier; ///< 'MP3' on all files I have seen + unsigned int audio_br; ///< bitrate of audio channel (mp3) + unsigned int img_colorfmt; ///< frame colorfmt rgb 565/555 + unsigned int img_bpp; ///< frame bits per pixel + unsigned int img_width; // + unsigned int img_height; // + unsigned int img_segment_size; ///< size of image segment + unsigned int video_fps; // + unsigned int full_segment_size; } MTVDemuxContext; static int mtv_probe(AVProbeData *p) { - if(p->buf_size < 3) - return 0; - /* Magic is 'AMV' */ + if (*p->buf != 'A' || *(p->buf + 1) != 'M' || *(p->buf + 2) != 'V') + return 0; - if(*(p->buf) != 'A' || *(p->buf+1) != 'M' || *(p->buf+2) != 'V') + /* Check for nonzero in bpp and (width|height) header fields */ + if(!(p->buf[51] && AV_RL16(&p->buf[52]) | AV_RL16(&p->buf[54]))) return 0; + /* If width or height are 0 then imagesize header field should not */ + if(!AV_RL16(&p->buf[52]) || !AV_RL16(&p->buf[54])) + { + if(!!AV_RL16(&p->buf[56])) + return AVPROBE_SCORE_MAX/2; + else + return 0; + } + + if(p->buf[51] != 16) + return AVPROBE_SCORE_MAX/4; // But we are going to assume 16bpp anyway .. + return AVPROBE_SCORE_MAX; } -static int mtv_read_header(AVFormatContext *s, AVFormatParameters *ap) +static int mtv_read_header(AVFormatContext *s) { - MTVDemuxContext *mtv = s->priv_data; - ByteIOContext *pb = &s->pb; - AVStream *st; - - - url_fskip(pb, 3); - mtv->file_size = get_le32(pb); - mtv->segments = get_le32(pb); - url_fskip(pb, 32); - mtv->audio_identifier = get_le24(pb); - mtv->audio_br = get_le16(pb); - mtv->img_colorfmt = get_le24(pb); - mtv->img_bpp = get_byte(pb); - mtv->img_width = get_le16(pb); - mtv->img_height = get_le16(pb); - mtv->img_segment_size = get_le16(pb); - url_fskip(pb, 4); - mtv->audio_subsegments = get_le16(pb); - mtv->video_fps = (mtv->audio_br / 4) / mtv->audio_subsegments; - - /* FIXME Add sanity check here */ + MTVDemuxContext *mtv = s->priv_data; + AVIOContext *pb = s->pb; + AVStream *st; + unsigned int audio_subsegments; + + avio_skip(pb, 3); + mtv->file_size = avio_rl32(pb); + mtv->segments = avio_rl32(pb); + avio_skip(pb, 32); + mtv->audio_identifier = avio_rl24(pb); + mtv->audio_br = avio_rl16(pb); + mtv->img_colorfmt = avio_rl24(pb); + mtv->img_bpp = avio_r8(pb); + mtv->img_width = avio_rl16(pb); + mtv->img_height = avio_rl16(pb); + mtv->img_segment_size = avio_rl16(pb); + + /* Calculate width and height if missing from header */ + + if(!mtv->img_width) + mtv->img_width=mtv->img_segment_size / (mtv->img_bpp>>3) + / mtv->img_height; + + if(!mtv->img_height) + mtv->img_height=mtv->img_segment_size / (mtv->img_bpp>>3) + / mtv->img_width; + + avio_skip(pb, 4); + audio_subsegments = avio_rl16(pb); + + if (audio_subsegments == 0) { + av_log_ask_for_sample(s, "MTV files without audio are not supported\n"); + return AVERROR_INVALIDDATA; + } - /* first packet is always audio*/ + mtv->full_segment_size = + audio_subsegments * (MTV_AUDIO_PADDING_SIZE + MTV_ASUBCHUNK_DATA_SIZE) + + mtv->img_segment_size; + mtv->video_fps = (mtv->audio_br / 4) / audio_subsegments; - mtv->audio_packet_count = 1; + // FIXME Add sanity check here - /* all systems go! init decoders */ + // all systems go! init decoders - /* video - raw rgb565 */ + // video - raw rgb565 - st = av_new_stream(s, VIDEO_SID); + st = avformat_new_stream(s, NULL); if(!st) - return AVERROR_NOMEM; + return AVERROR(ENOMEM); - av_set_pts_info(st, 64, 1, mtv->video_fps); - st->codec->codec_type = CODEC_TYPE_VIDEO; + avpriv_set_pts_info(st, 64, 1, mtv->video_fps); + st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = CODEC_ID_RAWVIDEO; - st->codec->codec_tag = MKTAG('R', 'G', 'B', mtv->img_bpp); + st->codec->pix_fmt = PIX_FMT_RGB565; st->codec->width = mtv->img_width; st->codec->height = mtv->img_height; - st->codec->bits_per_sample = mtv->img_bpp; st->codec->sample_rate = mtv->video_fps; + st->codec->extradata = av_strdup("BottomUp"); + st->codec->extradata_size = 9; - /* audio - mp3 */ + // audio - mp3 - st = av_new_stream(s, AUDIO_SID); + st = avformat_new_stream(s, NULL); if(!st) - return AVERROR_NOMEM; + return AVERROR(ENOMEM); - av_set_pts_info(st, 64, 1, AUDIO_SAMPLING_RATE); - st->codec->codec_type = CODEC_TYPE_AUDIO; + avpriv_set_pts_info(st, 64, 1, AUDIO_SAMPLING_RATE); + st->codec->codec_type = AVMEDIA_TYPE_AUDIO; st->codec->codec_id = CODEC_ID_MP3; st->codec->bit_rate = mtv->audio_br; - st->need_parsing=1; + st->need_parsing = AVSTREAM_PARSE_FULL; - /* Jump over header */ + // Jump over header - if(url_fseek(pb, MTV_HEADER_SIZE, SEEK_SET) != MTV_HEADER_SIZE) - return AVERROR_IO; + if(avio_seek(pb, MTV_HEADER_SIZE, SEEK_SET) != MTV_HEADER_SIZE) + return AVERROR(EIO); - return(0); + return 0; } static int mtv_read_packet(AVFormatContext *s, AVPacket *pkt) { MTVDemuxContext *mtv = s->priv_data; - ByteIOContext *pb = &s->pb; + AVIOContext *pb = s->pb; int ret; -#ifndef WORDS_BIGENDIAN +#if !HAVE_BIGENDIAN int i; #endif - ret = 0; - - if(mtv->audio_subsegments >= mtv->audio_packet_count) + if((avio_tell(pb) - s->data_offset + mtv->img_segment_size) % mtv->full_segment_size) { - url_fskip(pb, MTV_AUDIO_PADDING_SIZE); + avio_skip(pb, MTV_AUDIO_PADDING_SIZE); ret = av_get_packet(pb, pkt, MTV_ASUBCHUNK_DATA_SIZE); - if(ret != MTV_ASUBCHUNK_DATA_SIZE) - return AVERROR_IO; + if(ret < 0) + return ret; - mtv->audio_packet_count++; - pkt->stream_index = AUDIO_SID; + pkt->pos -= MTV_AUDIO_PADDING_SIZE; + pkt->stream_index = 1; }else { ret = av_get_packet(pb, pkt, mtv->img_segment_size); - if(ret != mtv->img_segment_size) - return AVERROR_IO; + if(ret < 0) + return ret; -#ifndef WORDS_BIGENDIAN +#if !HAVE_BIGENDIAN /* pkt->data is GGGRRRR BBBBBGGG * and we need RRRRRGGG GGGBBBBB @@ -168,20 +193,19 @@ static int mtv_read_packet(AVFormatContext *s, AVPacket *pkt) */ for(i=0;iimg_segment_size/2;i++) - *((uint16_t *)pkt->data+i) = bswap_16(*((uint16_t *)pkt->data+i)); + *((uint16_t *)pkt->data+i) = av_bswap16(*((uint16_t *)pkt->data+i)); #endif - mtv->audio_packet_count = 1; - pkt->stream_index = VIDEO_SID; + pkt->stream_index = 0; } - return(ret); + return ret; } -AVInputFormat mtv_demuxer = { - "MTV", - "MTV format", - sizeof(MTVDemuxContext), - mtv_probe, - mtv_read_header, - mtv_read_packet, +AVInputFormat ff_mtv_demuxer = { + .name = "MTV", + .long_name = NULL_IF_CONFIG_SMALL("MTV format"), + .priv_data_size = sizeof(MTVDemuxContext), + .read_probe = mtv_probe, + .read_header = mtv_read_header, + .read_packet = mtv_read_packet, };