| /* |
| * 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; |
| 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 (int i = 0;;) { |
| 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; |
| header_end = &header[i + 1]; // Include space |
| 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); |
| } |
| |
| 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 }, |
| }; |
| size_t i; |
| 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_INVALIDDATA; |
| } |
| 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, |
| }; |
