/* * YUV4MPEG demuxer * Copyright (c) 2001, 2002, 2003 Fabrice Bellard * * 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 "avformat.h" #include "internal.h" #include "yuv4mpeg.h" /* Header size increased to allow room for optional flags */ #define MAX_YUV4_HEADER 80 #define MAX_FRAME_HEADER 80 static int yuv4_read_header(AVFormatContext *s) { char header[MAX_YUV4_HEADER + 10]; // Include headroom for // the longest option char *tokstart, *tokend, *header_end; int i; AVIOContext *pb = s->pb; int width = -1, height = -1, raten = 0, rated = 0, aspectn = 0, aspectd = 0; enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE; enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED; enum AVFieldOrder field_order = AV_FIELD_UNKNOWN; AVStream *st; for (i = 0; i < MAX_YUV4_HEADER; i++) { header[i] = avio_r8(pb); if (header[i] == '\n') { header[i + 1] = 0x20; // Add a space after last option. // Makes parsing "444" vs "444alpha" easier. header[i + 2] = 0; break; } } if (i == MAX_YUV4_HEADER) return -1; if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) return -1; header_end = &header[i + 1]; // Include space for (tokstart = &header[strlen(Y4M_MAGIC) + 1]; tokstart < header_end; tokstart++) { if (*tokstart == 0x20) continue; switch (*tokstart++) { case 'W': // Width. Required. width = strtol(tokstart, &tokend, 10); tokstart = tokend; break; case 'H': // Height. Required. height = strtol(tokstart, &tokend, 10); tokstart = tokend; break; case 'C': // Color space if (strncmp("420jpeg", tokstart, 7) == 0) { pix_fmt = AV_PIX_FMT_YUV420P; chroma_sample_location = AVCHROMA_LOC_CENTER; } else if (strncmp("420mpeg2", tokstart, 8) == 0) { pix_fmt = AV_PIX_FMT_YUV420P; chroma_sample_location = AVCHROMA_LOC_LEFT; } else if (strncmp("420paldv", tokstart, 8) == 0) { pix_fmt = AV_PIX_FMT_YUV420P; chroma_sample_location = AVCHROMA_LOC_TOPLEFT; } else if (strncmp("420p16", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV420P16; } else if (strncmp("422p16", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV422P16; } else if (strncmp("444p16", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV444P16; } else if (strncmp("420p14", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV420P14; } else if (strncmp("422p14", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV422P14; } else if (strncmp("444p14", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV444P14; } else if (strncmp("420p12", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV420P12; } else if (strncmp("422p12", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV422P12; } else if (strncmp("444p12", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV444P12; } else if (strncmp("420p10", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV420P10; } else if (strncmp("422p10", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV422P10; } else if (strncmp("444p10", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_YUV444P10; } else if (strncmp("420p9", tokstart, 5) == 0) { pix_fmt = AV_PIX_FMT_YUV420P9; } else if (strncmp("422p9", tokstart, 5) == 0) { pix_fmt = AV_PIX_FMT_YUV422P9; } else if (strncmp("444p9", tokstart, 5) == 0) { pix_fmt = AV_PIX_FMT_YUV444P9; } else if (strncmp("420", tokstart, 3) == 0) { pix_fmt = AV_PIX_FMT_YUV420P; chroma_sample_location = AVCHROMA_LOC_CENTER; } else if (strncmp("411", tokstart, 3) == 0) { pix_fmt = AV_PIX_FMT_YUV411P; } else if (strncmp("422", tokstart, 3) == 0) { pix_fmt = AV_PIX_FMT_YUV422P; } else if (strncmp("444alpha", tokstart, 8) == 0 ) { av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 " "YUV4MPEG stream.\n"); return -1; } else if (strncmp("444", tokstart, 3) == 0) { pix_fmt = AV_PIX_FMT_YUV444P; } else if (strncmp("mono16", tokstart, 6) == 0) { pix_fmt = AV_PIX_FMT_GRAY16; } else if (strncmp("mono", tokstart, 4) == 0) { pix_fmt = AV_PIX_FMT_GRAY8; } else { av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown " "pixel format.\n"); return -1; } while (tokstart < header_end && *tokstart != 0x20) tokstart++; break; case 'I': // Interlace type switch (*tokstart++){ case '?': field_order = AV_FIELD_UNKNOWN; break; case 'p': field_order = AV_FIELD_PROGRESSIVE; break; case 't': field_order = AV_FIELD_TT; break; case 'b': field_order = AV_FIELD_BB; break; case 'm': av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed " "interlaced and non-interlaced frames.\n"); default: av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n"); return AVERROR(EINVAL); } break; case 'F': // Frame rate sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown while (tokstart < header_end && *tokstart != 0x20) tokstart++; break; case 'A': // Pixel aspect sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown while (tokstart < header_end && *tokstart != 0x20) tokstart++; break; case 'X': // Vendor extensions if (strncmp("YSCSS=", tokstart, 6) == 0) { // Older nonstandard pixel format representation tokstart += 6; if (strncmp("420JPEG", tokstart, 7) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P; else if (strncmp("420MPEG2", tokstart, 8) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P; else if (strncmp("420PALDV", tokstart, 8) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P; else if (strncmp("420P9", tokstart, 5) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P9; else if (strncmp("422P9", tokstart, 5) == 0) alt_pix_fmt = AV_PIX_FMT_YUV422P9; else if (strncmp("444P9", tokstart, 5) == 0) alt_pix_fmt = AV_PIX_FMT_YUV444P9; else if (strncmp("420P10", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P10; else if (strncmp("422P10", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV422P10; else if (strncmp("444P10", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV444P10; else if (strncmp("420P12", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P12; else if (strncmp("422P12", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV422P12; else if (strncmp("444P12", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV444P12; else if (strncmp("420P14", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P14; else if (strncmp("422P14", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV422P14; else if (strncmp("444P14", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV444P14; else if (strncmp("420P16", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV420P16; else if (strncmp("422P16", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV422P16; else if (strncmp("444P16", tokstart, 6) == 0) alt_pix_fmt = AV_PIX_FMT_YUV444P16; else if (strncmp("411", tokstart, 3) == 0) alt_pix_fmt = AV_PIX_FMT_YUV411P; else if (strncmp("422", tokstart, 3) == 0) alt_pix_fmt = AV_PIX_FMT_YUV422P; else if (strncmp("444", tokstart, 3) == 0) alt_pix_fmt = AV_PIX_FMT_YUV444P; } while (tokstart < header_end && *tokstart != 0x20) tokstart++; break; } } if (width == -1 || height == -1) { av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n"); return -1; } if (pix_fmt == AV_PIX_FMT_NONE) { if (alt_pix_fmt == AV_PIX_FMT_NONE) pix_fmt = AV_PIX_FMT_YUV420P; else pix_fmt = alt_pix_fmt; } if (raten <= 0 || rated <= 0) { // Frame rate unknown raten = 25; rated = 1; } if (aspectn == 0 && aspectd == 0) { // Pixel aspect unknown aspectd = 1; } st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codec->width = width; st->codec->height = height; av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1); avpriv_set_pts_info(st, 64, rated, raten); st->avg_frame_rate = av_inv_q(st->time_base); st->codec->pix_fmt = pix_fmt; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = AV_CODEC_ID_RAWVIDEO; st->sample_aspect_ratio = (AVRational){ aspectn, aspectd }; st->codec->chroma_sample_location = chroma_sample_location; st->codec->field_order = field_order; s->packet_size = avpicture_get_size(st->codec->pix_fmt, width, height) + Y4M_FRAME_MAGIC_LEN; if ((int) s->packet_size < 0) return s->packet_size; s->internal->data_offset = avio_tell(pb); st->duration = (avio_size(pb) - avio_tell(pb)) / s->packet_size; return 0; } static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt) { int i; char header[MAX_FRAME_HEADER+1]; int ret, off = avio_tell(s->pb); for (i = 0; i < MAX_FRAME_HEADER; i++) { header[i] = avio_r8(s->pb); if (header[i] == '\n') { header[i + 1] = 0; break; } } if (s->pb->error) return s->pb->error; else if (s->pb->eof_reached) return AVERROR_EOF; else if (i == MAX_FRAME_HEADER) return AVERROR_INVALIDDATA; if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC))) return AVERROR_INVALIDDATA; ret = av_get_packet(s->pb, pkt, s->packet_size - Y4M_FRAME_MAGIC_LEN); if (ret < 0) return ret; else if (ret != s->packet_size - Y4M_FRAME_MAGIC_LEN) return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO); pkt->stream_index = 0; pkt->pts = (off - s->internal->data_offset) / s->packet_size; pkt->duration = 1; return 0; } static int yuv4_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags) { avio_seek(s->pb, pts * s->packet_size + s->internal->data_offset, SEEK_SET); return 0; } static int yuv4_probe(AVProbeData *pd) { /* check file header */ if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0) return AVPROBE_SCORE_MAX; else return 0; } AVInputFormat ff_yuv4mpegpipe_demuxer = { .name = "yuv4mpegpipe", .long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"), .read_probe = yuv4_probe, .read_header = yuv4_read_header, .read_packet = yuv4_read_packet, .read_seek = yuv4_read_seek, .extensions = "y4m", };