yading@11: /*
yading@11:  * NuppelVideo demuxer.
yading@11:  * Copyright (c) 2006 Reimar Doeffinger
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "libavutil/intfloat.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "riff.h"
yading@11: 
yading@11: static const AVCodecTag nuv_audio_tags[] = {
yading@11:     { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
yading@11:     { AV_CODEC_ID_MP3,       MKTAG('L', 'A', 'M', 'E') },
yading@11:     { AV_CODEC_ID_NONE,      0 },
yading@11: };
yading@11: 
yading@11: typedef struct {
yading@11:     int v_id;
yading@11:     int a_id;
yading@11:     int rtjpg_video;
yading@11: } NUVContext;
yading@11: 
yading@11: typedef enum {
yading@11:     NUV_VIDEO     = 'V',
yading@11:     NUV_EXTRADATA = 'D',
yading@11:     NUV_AUDIO     = 'A',
yading@11:     NUV_SEEKP     = 'R',
yading@11:     NUV_MYTHEXT   = 'X'
yading@11: } nuv_frametype;
yading@11: 
yading@11: static int nuv_probe(AVProbeData *p)
yading@11: {
yading@11:     if (!memcmp(p->buf, "NuppelVideo", 12))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     if (!memcmp(p->buf, "MythTVVideo", 12))
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: /// little macro to sanitize packet size
yading@11: #define PKTSIZE(s) (s &  0xffffff)
yading@11: 
yading@11: /**
yading@11:  * @brief read until we found all data needed for decoding
yading@11:  * @param vst video stream of which to change parameters
yading@11:  * @param ast video stream of which to change parameters
yading@11:  * @param myth set if this is a MythTVVideo format file
yading@11:  * @return 0 or AVERROR code
yading@11:  */
yading@11: static int get_codec_data(AVIOContext *pb, AVStream *vst,
yading@11:                           AVStream *ast, int myth)
yading@11: {
yading@11:     nuv_frametype frametype;
yading@11: 
yading@11:     if (!vst && !myth)
yading@11:         return 1; // no codec data needed
yading@11:     while (!url_feof(pb)) {
yading@11:         int size, subtype;
yading@11: 
yading@11:         frametype = avio_r8(pb);
yading@11:         switch (frametype) {
yading@11:         case NUV_EXTRADATA:
yading@11:             subtype = avio_r8(pb);
yading@11:             avio_skip(pb, 6);
yading@11:             size = PKTSIZE(avio_rl32(pb));
yading@11:             if (vst && subtype == 'R') {
yading@11:                 if (vst->codec->extradata) {
yading@11:                     av_freep(&vst->codec->extradata);
yading@11:                     vst->codec->extradata_size = 0;
yading@11:                 }
yading@11:                 vst->codec->extradata = av_malloc(size);
yading@11:                 if (!vst->codec->extradata)
yading@11:                     return AVERROR(ENOMEM);
yading@11:                 vst->codec->extradata_size = size;
yading@11:                 avio_read(pb, vst->codec->extradata, size);
yading@11:                 size = 0;
yading@11:                 if (!myth)
yading@11:                     return 0;
yading@11:             }
yading@11:             break;
yading@11:         case NUV_MYTHEXT:
yading@11:             avio_skip(pb, 7);
yading@11:             size = PKTSIZE(avio_rl32(pb));
yading@11:             if (size != 128 * 4)
yading@11:                 break;
yading@11:             avio_rl32(pb); // version
yading@11:             if (vst) {
yading@11:                 vst->codec->codec_tag = avio_rl32(pb);
yading@11:                 vst->codec->codec_id =
yading@11:                     ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag);
yading@11:                 if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G'))
yading@11:                     vst->codec->codec_id = AV_CODEC_ID_NUV;
yading@11:             } else
yading@11:                 avio_skip(pb, 4);
yading@11: 
yading@11:             if (ast) {
yading@11:                 int id;
yading@11: 
yading@11:                 ast->codec->codec_tag             = avio_rl32(pb);
yading@11:                 ast->codec->sample_rate           = avio_rl32(pb);
yading@11:                 ast->codec->bits_per_coded_sample = avio_rl32(pb);
yading@11:                 ast->codec->channels              = avio_rl32(pb);
yading@11:                 ast->codec->channel_layout        = 0;
yading@11: 
yading@11:                 id = ff_wav_codec_get_id(ast->codec->codec_tag,
yading@11:                                          ast->codec->bits_per_coded_sample);
yading@11:                 if (id == AV_CODEC_ID_NONE) {
yading@11:                     id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag);
yading@11:                     if (id == AV_CODEC_ID_PCM_S16LE)
yading@11:                         id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample,
yading@11:                                                  0, 0, ~1);
yading@11:                 }
yading@11:                 ast->codec->codec_id = id;
yading@11: 
yading@11:                 ast->need_parsing = AVSTREAM_PARSE_FULL;
yading@11:             } else
yading@11:                 avio_skip(pb, 4 * 4);
yading@11: 
yading@11:             size -= 6 * 4;
yading@11:             avio_skip(pb, size);
yading@11:             return 0;
yading@11:         case NUV_SEEKP:
yading@11:             size = 11;
yading@11:             break;
yading@11:         default:
yading@11:             avio_skip(pb, 7);
yading@11:             size = PKTSIZE(avio_rl32(pb));
yading@11:             break;
yading@11:         }
yading@11:         avio_skip(pb, size);
yading@11:     }
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: static int nuv_header(AVFormatContext *s)
yading@11: {
yading@11:     NUVContext *ctx = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     char id_string[12];
yading@11:     double aspect, fps;
yading@11:     int is_mythtv, width, height, v_packs, a_packs, ret;
yading@11:     AVStream *vst = NULL, *ast = NULL;
yading@11: 
yading@11:     avio_read(pb, id_string, 12);
yading@11:     is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
yading@11:     avio_skip(pb, 5);       // version string
yading@11:     avio_skip(pb, 3);       // padding
yading@11:     width  = avio_rl32(pb);
yading@11:     height = avio_rl32(pb);
yading@11:     avio_rl32(pb);          // unused, "desiredwidth"
yading@11:     avio_rl32(pb);          // unused, "desiredheight"
yading@11:     avio_r8(pb);            // 'P' == progressive, 'I' == interlaced
yading@11:     avio_skip(pb, 3);       // padding
yading@11:     aspect = av_int2double(avio_rl64(pb));
yading@11:     if (aspect > 0.9999 && aspect < 1.0001)
yading@11:         aspect = 4.0 / 3.0;
yading@11:     fps = av_int2double(avio_rl64(pb));
yading@11: 
yading@11:     // number of packets per stream type, -1 means unknown, e.g. streaming
yading@11:     v_packs = avio_rl32(pb);
yading@11:     a_packs = avio_rl32(pb);
yading@11:     avio_rl32(pb); // text
yading@11: 
yading@11:     avio_rl32(pb); // keyframe distance (?)
yading@11: 
yading@11:     if (v_packs) {
yading@11:         vst = avformat_new_stream(s, NULL);
yading@11:         if (!vst)
yading@11:             return AVERROR(ENOMEM);
yading@11:         ctx->v_id = vst->index;
yading@11: 
yading@11:         vst->codec->codec_type            = AVMEDIA_TYPE_VIDEO;
yading@11:         vst->codec->codec_id              = AV_CODEC_ID_NUV;
yading@11:         vst->codec->width                 = width;
yading@11:         vst->codec->height                = height;
yading@11:         vst->codec->bits_per_coded_sample = 10;
yading@11:         vst->sample_aspect_ratio          = av_d2q(aspect * height / width,
yading@11:                                                    10000);
yading@11: #if FF_API_R_FRAME_RATE
yading@11:         vst->r_frame_rate =
yading@11: #endif
yading@11:         vst->avg_frame_rate = av_d2q(fps, 60000);
yading@11:         avpriv_set_pts_info(vst, 32, 1, 1000);
yading@11:     } else
yading@11:         ctx->v_id = -1;
yading@11: 
yading@11:     if (a_packs) {
yading@11:         ast = avformat_new_stream(s, NULL);
yading@11:         if (!ast)
yading@11:             return AVERROR(ENOMEM);
yading@11:         ctx->a_id = ast->index;
yading@11: 
yading@11:         ast->codec->codec_type            = AVMEDIA_TYPE_AUDIO;
yading@11:         ast->codec->codec_id              = AV_CODEC_ID_PCM_S16LE;
yading@11:         ast->codec->channels              = 2;
yading@11:         ast->codec->channel_layout        = AV_CH_LAYOUT_STEREO;
yading@11:         ast->codec->sample_rate           = 44100;
yading@11:         ast->codec->bit_rate              = 2 * 2 * 44100 * 8;
yading@11:         ast->codec->block_align           = 2 * 2;
yading@11:         ast->codec->bits_per_coded_sample = 16;
yading@11:         avpriv_set_pts_info(ast, 32, 1, 1000);
yading@11:     } else
yading@11:         ctx->a_id = -1;
yading@11: 
yading@11:     if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0)
yading@11:         return ret;
yading@11: 
yading@11:     ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV;
yading@11: 
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: #define HDRSIZE 12
yading@11: 
yading@11: static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
yading@11: {
yading@11:     NUVContext *ctx = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint8_t hdr[HDRSIZE];
yading@11:     nuv_frametype frametype;
yading@11:     int ret, size;
yading@11: 
yading@11:     while (!url_feof(pb)) {
yading@11:         int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
yading@11:         uint64_t pos    = avio_tell(pb);
yading@11: 
yading@11:         ret = avio_read(pb, hdr, HDRSIZE);
yading@11:         if (ret < HDRSIZE)
yading@11:             return ret < 0 ? ret : AVERROR(EIO);
yading@11: 
yading@11:         frametype = hdr[0];
yading@11:         size      = PKTSIZE(AV_RL32(&hdr[8]));
yading@11: 
yading@11:         switch (frametype) {
yading@11:         case NUV_EXTRADATA:
yading@11:             if (!ctx->rtjpg_video) {
yading@11:                 avio_skip(pb, size);
yading@11:                 break;
yading@11:             }
yading@11:         case NUV_VIDEO:
yading@11:             if (ctx->v_id < 0) {
yading@11:                 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
yading@11:                 avio_skip(pb, size);
yading@11:                 break;
yading@11:             }
yading@11:             ret = av_new_packet(pkt, copyhdrsize + size);
yading@11:             if (ret < 0)
yading@11:                 return ret;
yading@11: 
yading@11:             pkt->pos          = pos;
yading@11:             pkt->flags       |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
yading@11:             pkt->pts          = AV_RL32(&hdr[4]);
yading@11:             pkt->stream_index = ctx->v_id;
yading@11:             memcpy(pkt->data, hdr, copyhdrsize);
yading@11:             ret = avio_read(pb, pkt->data + copyhdrsize, size);
yading@11:             if (ret < 0) {
yading@11:                 av_free_packet(pkt);
yading@11:                 return ret;
yading@11:             }
yading@11:             if (ret < size)
yading@11:                 av_shrink_packet(pkt, copyhdrsize + ret);
yading@11:             return 0;
yading@11:         case NUV_AUDIO:
yading@11:             if (ctx->a_id < 0) {
yading@11:                 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
yading@11:                 avio_skip(pb, size);
yading@11:                 break;
yading@11:             }
yading@11:             ret               = av_get_packet(pb, pkt, size);
yading@11:             pkt->flags       |= AV_PKT_FLAG_KEY;
yading@11:             pkt->pos          = pos;
yading@11:             pkt->pts          = AV_RL32(&hdr[4]);
yading@11:             pkt->stream_index = ctx->a_id;
yading@11:             if (ret < 0)
yading@11:                 return ret;
yading@11:             return 0;
yading@11:         case NUV_SEEKP:
yading@11:             // contains no data, size value is invalid
yading@11:             break;
yading@11:         default:
yading@11:             avio_skip(pb, size);
yading@11:             break;
yading@11:         }
yading@11:     }
yading@11: 
yading@11:     return AVERROR(EIO);
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
yading@11:  * \return 1 if the syncword is found 0 otherwise.
yading@11:  */
yading@11: static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint32_t tag = 0;
yading@11:     while(!url_feof(pb) && avio_tell(pb) < pos_limit) {
yading@11:         tag = (tag << 8) | avio_r8(pb);
yading@11:         if (tag                  == MKBETAG('R','T','j','j') &&
yading@11:            (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
yading@11:            (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
yading@11:             return 1;
yading@11:     }
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: /**
yading@11:  * \brief attempts to read a timestamp from stream at the given stream position
yading@11:  * \return timestamp if successful and AV_NOPTS_VALUE if failure
yading@11:  */
yading@11: static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
yading@11:                             int64_t *ppos, int64_t pos_limit)
yading@11: {
yading@11:     NUVContext *ctx = s->priv_data;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     uint8_t hdr[HDRSIZE];
yading@11:     nuv_frametype frametype;
yading@11:     int size, key, idx;
yading@11:     int64_t pos, dts;
yading@11: 
yading@11:     if (avio_seek(pb, *ppos, SEEK_SET) < 0)
yading@11:         return AV_NOPTS_VALUE;
yading@11: 
yading@11:     if (!nuv_resync(s, pos_limit))
yading@11:         return AV_NOPTS_VALUE;
yading@11: 
yading@11:     while (!url_feof(pb) && avio_tell(pb) < pos_limit) {
yading@11:         if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
yading@11:             return AV_NOPTS_VALUE;
yading@11:         frametype = hdr[0];
yading@11:         size = PKTSIZE(AV_RL32(&hdr[8]));
yading@11:         switch (frametype) {
yading@11:             case NUV_SEEKP:
yading@11:                 break;
yading@11:             case NUV_AUDIO:
yading@11:             case NUV_VIDEO:
yading@11:                 if (frametype == NUV_VIDEO) {
yading@11:                     idx = ctx->v_id;
yading@11:                     key = hdr[2] == 0;
yading@11:                 } else {
yading@11:                     idx = ctx->a_id;
yading@11:                     key = 1;
yading@11:                 }
yading@11:                 if (stream_index == idx) {
yading@11: 
yading@11:                     pos = avio_tell(s->pb) - HDRSIZE;
yading@11:                     dts = AV_RL32(&hdr[4]);
yading@11: 
yading@11:                     // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
yading@11:                     av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
yading@11:                             key ? AVINDEX_KEYFRAME : 0);
yading@11: 
yading@11:                     *ppos = pos;
yading@11:                     return dts;
yading@11:                 }
yading@11:             default:
yading@11:                 avio_skip(pb, size);
yading@11:                 break;
yading@11:         }
yading@11:     }
yading@11:     return AV_NOPTS_VALUE;
yading@11: }
yading@11: 
yading@11: 
yading@11: AVInputFormat ff_nuv_demuxer = {
yading@11:     .name           = "nuv",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("NuppelVideo"),
yading@11:     .priv_data_size = sizeof(NUVContext),
yading@11:     .read_probe     = nuv_probe,
yading@11:     .read_header    = nuv_header,
yading@11:     .read_packet    = nuv_packet,
yading@11:     .read_timestamp = nuv_read_dts,
yading@11:     .flags          = AVFMT_GENERIC_INDEX,
yading@11: };