/* * 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 "libavutil/avstring.h" #include "libavutil/imgutils.h" #include "avformat.h" #include "internal.h" #include "yuv4mpeg.h" /* Header size increased to allow room for optional flags */ #define MAX_YUV4_HEADER 128 #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; enum AVColorRange color_range = AVCOL_RANGE_UNSPECIFIED; AVStream *st; int64_t data_offset; 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) { av_log(s, AV_LOG_ERROR, "Header too large.\n"); return AVERROR(EINVAL); } if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC))) { av_log(s, AV_LOG_ERROR, "Invalid magic number for yuv4mpeg.\n"); return AVERROR(EINVAL); } 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 { static const struct { #define MAX_PIX_FMT_LENGTH 8 char name[MAX_PIX_FMT_LENGTH + 1]; #undef MAX_PIX_FMT_LENGTH enum AVPixelFormat pix_fmt; enum AVChromaLocation chroma_loc; } pix_fmt_array[] = { { "420jpeg", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_CENTER }, { "420mpeg2", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_LEFT }, { "420paldv", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_TOPLEFT }, { "420p16", AV_PIX_FMT_YUV420P16, AVCHROMA_LOC_UNSPECIFIED }, { "422p16", AV_PIX_FMT_YUV422P16, AVCHROMA_LOC_UNSPECIFIED }, { "444p16", AV_PIX_FMT_YUV444P16, AVCHROMA_LOC_UNSPECIFIED }, { "420p14", AV_PIX_FMT_YUV420P14, AVCHROMA_LOC_UNSPECIFIED }, { "422p14", AV_PIX_FMT_YUV422P14, AVCHROMA_LOC_UNSPECIFIED }, { "444p14", AV_PIX_FMT_YUV444P14, AVCHROMA_LOC_UNSPECIFIED }, { "420p12", AV_PIX_FMT_YUV420P12, AVCHROMA_LOC_UNSPECIFIED }, { "422p12", AV_PIX_FMT_YUV422P12, AVCHROMA_LOC_UNSPECIFIED }, { "444p12", AV_PIX_FMT_YUV444P12, AVCHROMA_LOC_UNSPECIFIED }, { "420p10", AV_PIX_FMT_YUV420P10, AVCHROMA_LOC_UNSPECIFIED }, { "422p10", AV_PIX_FMT_YUV422P10, AVCHROMA_LOC_UNSPECIFIED }, { "444p10", AV_PIX_FMT_YUV444P10, AVCHROMA_LOC_UNSPECIFIED }, { "420p9", AV_PIX_FMT_YUV420P9, AVCHROMA_LOC_UNSPECIFIED }, { "422p9", AV_PIX_FMT_YUV422P9, AVCHROMA_LOC_UNSPECIFIED }, { "444p9", AV_PIX_FMT_YUV444P9, AVCHROMA_LOC_UNSPECIFIED }, { "420", AV_PIX_FMT_YUV420P, AVCHROMA_LOC_CENTER }, { "411", AV_PIX_FMT_YUV411P, AVCHROMA_LOC_UNSPECIFIED }, { "422", AV_PIX_FMT_YUV422P, AVCHROMA_LOC_UNSPECIFIED }, { "444alpha", AV_PIX_FMT_YUVA444P, AVCHROMA_LOC_UNSPECIFIED }, { "444", AV_PIX_FMT_YUV444P, AVCHROMA_LOC_UNSPECIFIED }, { "mono16", AV_PIX_FMT_GRAY16, AVCHROMA_LOC_UNSPECIFIED }, { "mono12", AV_PIX_FMT_GRAY12, AVCHROMA_LOC_UNSPECIFIED }, { "mono10", AV_PIX_FMT_GRAY10, AVCHROMA_LOC_UNSPECIFIED }, { "mono9", AV_PIX_FMT_GRAY9, AVCHROMA_LOC_UNSPECIFIED }, { "mono", AV_PIX_FMT_GRAY8, AVCHROMA_LOC_UNSPECIFIED }, }; for (i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++) { if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) { pix_fmt = pix_fmt_array[i].pix_fmt; if (pix_fmt_array[i].chroma_loc != AVCHROMA_LOC_UNSPECIFIED) chroma_sample_location = pix_fmt_array[i].chroma_loc; break; } } if (i == FF_ARRAY_ELEMS(pix_fmt_array)) { av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown " "pixel format.\n"); return AVERROR_INVALIDDATA; } 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) { static const struct { #define MAX_PIX_FMT_LENGTH 8 char name[MAX_PIX_FMT_LENGTH + 1]; #undef MAX_PIX_FMT_LENGTH enum AVPixelFormat pix_fmt; } pix_fmt_array[] = { { "420JPEG", AV_PIX_FMT_YUV420P }, { "420MPEG2", AV_PIX_FMT_YUV420P }, { "420PALDV", AV_PIX_FMT_YUV420P }, { "420P9", AV_PIX_FMT_YUV420P9 }, { "422P9", AV_PIX_FMT_YUV422P9 }, { "444P9", AV_PIX_FMT_YUV444P9 }, { "420P10", AV_PIX_FMT_YUV420P10 }, { "444P10", AV_PIX_FMT_YUV444P10 }, { "420P12", AV_PIX_FMT_YUV420P12 }, { "422P12", AV_PIX_FMT_YUV422P12 }, { "444P12", AV_PIX_FMT_YUV444P12 }, { "420P14", AV_PIX_FMT_YUV420P14 }, { "422P14", AV_PIX_FMT_YUV422P14 }, { "444P14", AV_PIX_FMT_YUV444P14 }, { "420P16", AV_PIX_FMT_YUV420P16 }, { "422P16", AV_PIX_FMT_YUV422P16 }, { "444P16", AV_PIX_FMT_YUV444P16 }, { "411", AV_PIX_FMT_YUV411P }, { "422", AV_PIX_FMT_YUV422P }, { "444", AV_PIX_FMT_YUV444P }, }; // Older nonstandard pixel format representation tokstart += 6; for (size_t i = 0; i < FF_ARRAY_ELEMS(pix_fmt_array); i++) if (av_strstart(tokstart, pix_fmt_array[i].name, NULL)) { alt_pix_fmt = pix_fmt_array[i].pix_fmt; break; } } else if (strncmp("COLORRANGE=", tokstart, 11) == 0) { tokstart += 11; if (strncmp("FULL",tokstart, 4) == 0) color_range = AVCOL_RANGE_JPEG; else if (strncmp("LIMITED", tokstart, 7) == 0) color_range = AVCOL_RANGE_MPEG; } 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 AVERROR_INVALIDDATA; } 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->codecpar->width = width; st->codecpar->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->codecpar->format = pix_fmt; st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO; st->sample_aspect_ratio = (AVRational){ aspectn, aspectd }; st->codecpar->chroma_location = chroma_sample_location; st->codecpar->color_range = color_range; st->codecpar->field_order = field_order; s->packet_size = av_image_get_buffer_size(st->codecpar->format, width, height, 1) + Y4M_FRAME_MAGIC_LEN; if ((int) s->packet_size < 0) return s->packet_size; ffformatcontext(s)->data_offset = data_offset = avio_tell(pb); st->duration = (avio_size(pb) - data_offset) / s->packet_size; return 0; } static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt) { int i; char header[MAX_FRAME_HEADER+1]; int ret; int64_t 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 - ffformatcontext(s)->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) { int64_t pos; if (flags & AVSEEK_FLAG_BACKWARD) pts = FFMAX(0, pts - 1); if (pts < 0) return -1; pos = pts * s->packet_size; if (avio_seek(s->pb, pos + ffformatcontext(s)->data_offset, SEEK_SET) < 0) return -1; return 0; } static int yuv4_probe(const AVProbeData *pd) { /* check file header */ if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0) return AVPROBE_SCORE_MAX; else return 0; } const 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", };