From e4dc1000d7bbbcb5b45cf9849fc5315f19578e37 Mon Sep 17 00:00:00 2001 From: Anton Khirnov Date: Sat, 3 May 2014 11:04:50 +0200 Subject: yuv4mpeg: split the demuxer and muxer into separate files --- libavformat/yuv4mpegdec.c | 273 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 273 insertions(+) create mode 100644 libavformat/yuv4mpegdec.c (limited to 'libavformat/yuv4mpegdec.c') diff --git a/libavformat/yuv4mpegdec.c b/libavformat/yuv4mpegdec.c new file mode 100644 index 0000000000..fb71dcb7e4 --- /dev/null +++ b/libavformat/yuv4mpegdec.c @@ -0,0 +1,273 @@ +/* + * YUV4MPEG demuxer + * Copyright (c) 2001, 2002, 2003 Fabrice Bellard + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 + +struct frame_attributes { + int interlaced_frame; + int top_field_first; +}; + +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; + AVStream *st; + struct frame_attributes *s1 = s->priv_data; + + 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; + + s1->interlaced_frame = 0; + s1->top_field_first = 0; + 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("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("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 '?': + break; + case 'p': + s1->interlaced_frame = 0; + break; + case 't': + s1->interlaced_frame = 1; + s1->top_field_first = 1; + break; + case 'b': + s1->interlaced_frame = 1; + s1->top_field_first = 0; + break; + case 'm': + av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed " + "interlaced and non-interlaced frames.\n"); + return -1; + default: + av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n"); + return -1; + } + 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("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; + + return 0; +} + +static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + int i; + char header[MAX_FRAME_HEADER+1]; + int packet_size, width, height, ret; + AVStream *st = s->streams[0]; + struct frame_attributes *s1 = s->priv_data; + + 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; + + width = st->codec->width; + height = st->codec->height; + + packet_size = avpicture_get_size(st->codec->pix_fmt, width, height); + if (packet_size < 0) + return packet_size; + + ret = av_get_packet(s->pb, pkt, packet_size); + if (ret < 0) + return ret; + else if (ret != packet_size) + return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO); + + if (st->codec->coded_frame) { + st->codec->coded_frame->interlaced_frame = s1->interlaced_frame; + st->codec->coded_frame->top_field_first = s1->top_field_first; + } + + pkt->stream_index = 0; + 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"), + .priv_data_size = sizeof(struct frame_attributes), + .read_probe = yuv4_probe, + .read_header = yuv4_read_header, + .read_packet = yuv4_read_packet, + .extensions = "y4m", +}; -- cgit v1.2.3