| /* | |
| * 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 "demux.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 FFInputFormat ff_yuv4mpegpipe_demuxer = { | |
| .p.name = "yuv4mpegpipe", | |
| .p.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"), | |
| .p.extensions = "y4m", | |
| .read_probe = yuv4_probe, | |
| .read_header = yuv4_read_header, | |
| .read_packet = yuv4_read_packet, | |
| .read_seek = yuv4_read_seek, | |
| }; |