/* * NuppelVideo demuxer. * Copyright (c) 2006 Reimar Doeffinger * * 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 */ #include "libavutil/intreadwrite.h" #include "avformat.h" #include "riff.h" typedef struct { int v_id; int a_id; int rtjpg_video; } NUVContext; typedef enum { NUV_VIDEO = 'V', NUV_EXTRADATA = 'D', NUV_AUDIO = 'A', NUV_SEEKP = 'R', NUV_MYTHEXT = 'X' } nuv_frametype; static int nuv_probe(AVProbeData *p) { if (!memcmp(p->buf, "NuppelVideo", 12)) return AVPROBE_SCORE_MAX; if (!memcmp(p->buf, "MythTVVideo", 12)) return AVPROBE_SCORE_MAX; return 0; } //! little macro to sanitize packet size #define PKTSIZE(s) (s & 0xffffff) /** * \brief read until we found all data needed for decoding * \param vst video stream of which to change parameters * \param ast video stream of which to change parameters * \param myth set if this is a MythTVVideo format file * \return 1 if all required codec data was found */ static int get_codec_data(ByteIOContext *pb, AVStream *vst, AVStream *ast, int myth) { nuv_frametype frametype; if (!vst && !myth) return 1; // no codec data needed while (!url_feof(pb)) { int size, subtype; frametype = get_byte(pb); switch (frametype) { case NUV_EXTRADATA: subtype = get_byte(pb); url_fskip(pb, 6); size = PKTSIZE(get_le32(pb)); if (vst && subtype == 'R') { vst->codec->extradata_size = size; vst->codec->extradata = av_malloc(size); get_buffer(pb, vst->codec->extradata, size); size = 0; if (!myth) return 1; } break; case NUV_MYTHEXT: url_fskip(pb, 7); size = PKTSIZE(get_le32(pb)); if (size != 128 * 4) break; get_le32(pb); // version if (vst) { vst->codec->codec_tag = get_le32(pb); vst->codec->codec_id = codec_get_id(codec_bmp_tags, vst->codec->codec_tag); if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G')) vst->codec->codec_id = CODEC_ID_NUV; } else url_fskip(pb, 4); if (ast) { ast->codec->codec_tag = get_le32(pb); ast->codec->sample_rate = get_le32(pb); ast->codec->bits_per_coded_sample = get_le32(pb); ast->codec->channels = get_le32(pb); ast->codec->codec_id = wav_codec_get_id(ast->codec->codec_tag, ast->codec->bits_per_coded_sample); ast->need_parsing = AVSTREAM_PARSE_FULL; } else url_fskip(pb, 4 * 4); size -= 6 * 4; url_fskip(pb, size); return 1; case NUV_SEEKP: size = 11; break; default: url_fskip(pb, 7); size = PKTSIZE(get_le32(pb)); break; } url_fskip(pb, size); } return 0; } static int nuv_header(AVFormatContext *s, AVFormatParameters *ap) { NUVContext *ctx = s->priv_data; ByteIOContext *pb = s->pb; char id_string[12], version_string[5]; double aspect, fps; int is_mythtv, width, height, v_packs, a_packs; int stream_nr = 0; AVStream *vst = NULL, *ast = NULL; get_buffer(pb, id_string, 12); is_mythtv = !memcmp(id_string, "MythTVVideo", 12); get_buffer(pb, version_string, 5); url_fskip(pb, 3); // padding width = get_le32(pb); height = get_le32(pb); get_le32(pb); // unused, "desiredwidth" get_le32(pb); // unused, "desiredheight" get_byte(pb); // 'P' == progressive, 'I' == interlaced url_fskip(pb, 3); // padding aspect = av_int2dbl(get_le64(pb)); if (aspect > 0.9999 && aspect < 1.0001) aspect = 4.0 / 3.0; fps = av_int2dbl(get_le64(pb)); // number of packets per stream type, -1 means unknown, e.g. streaming v_packs = get_le32(pb); a_packs = get_le32(pb); get_le32(pb); // text get_le32(pb); // keyframe distance (?) if (v_packs) { ctx->v_id = stream_nr++; vst = av_new_stream(s, ctx->v_id); if (!vst) return AVERROR(ENOMEM); vst->codec->codec_type = CODEC_TYPE_VIDEO; vst->codec->codec_id = CODEC_ID_NUV; vst->codec->width = width; vst->codec->height = height; vst->codec->bits_per_coded_sample = 10; vst->sample_aspect_ratio = av_d2q(aspect * height / width, 10000); vst->r_frame_rate = av_d2q(fps, 60000); av_set_pts_info(vst, 32, 1, 1000); } else ctx->v_id = -1; if (a_packs) { ctx->a_id = stream_nr++; ast = av_new_stream(s, ctx->a_id); if (!ast) return AVERROR(ENOMEM); ast->codec->codec_type = CODEC_TYPE_AUDIO; ast->codec->codec_id = CODEC_ID_PCM_S16LE; ast->codec->channels = 2; ast->codec->sample_rate = 44100; ast->codec->bit_rate = 2 * 2 * 44100 * 8; ast->codec->block_align = 2 * 2; ast->codec->bits_per_coded_sample = 16; av_set_pts_info(ast, 32, 1, 1000); } else ctx->a_id = -1; get_codec_data(pb, vst, ast, is_mythtv); ctx->rtjpg_video = vst && vst->codec->codec_id == CODEC_ID_NUV; return 0; } #define HDRSIZE 12 static int nuv_packet(AVFormatContext *s, AVPacket *pkt) { NUVContext *ctx = s->priv_data; ByteIOContext *pb = s->pb; uint8_t hdr[HDRSIZE]; nuv_frametype frametype; int ret, size; while (!url_feof(pb)) { int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0; ret = get_buffer(pb, hdr, HDRSIZE); if (ret <= 0) return ret ? ret : -1; frametype = hdr[0]; size = PKTSIZE(AV_RL32(&hdr[8])); switch (frametype) { case NUV_EXTRADATA: if (!ctx->rtjpg_video) { url_fskip(pb, size); break; } case NUV_VIDEO: if (ctx->v_id < 0) { av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n"); url_fskip(pb, size); break; } ret = av_new_packet(pkt, copyhdrsize + size); if (ret < 0) return ret; pkt->pos = url_ftell(pb) - copyhdrsize; pkt->pts = AV_RL32(&hdr[4]); pkt->stream_index = ctx->v_id; memcpy(pkt->data, hdr, copyhdrsize); ret = get_buffer(pb, pkt->data + copyhdrsize, size); return ret; case NUV_AUDIO: if (ctx->a_id < 0) { av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n"); url_fskip(pb, size); break; } ret = av_get_packet(pb, pkt, size); pkt->pts = AV_RL32(&hdr[4]); pkt->stream_index = ctx->a_id; return ret; case NUV_SEEKP: // contains no data, size value is invalid break; default: url_fskip(pb, size); break; } } return AVERROR(EIO); } AVInputFormat nuv_demuxer = { "nuv", NULL_IF_CONFIG_SMALL("NuppelVideo format"), sizeof(NUVContext), nuv_probe, nuv_header, nuv_packet, NULL, NULL, };