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yuv4mpeg: split the demuxer and muxer into separate files
This commit is contained in:
Anton Khirnov
273
libavformat/yuv4mpegdec.c
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273
libavformat/yuv4mpegdec.c
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/*
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* YUV4MPEG demuxer
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* Copyright (c) 2001, 2002, 2003 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avformat.h"
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#include "internal.h"
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#include "yuv4mpeg.h"
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/* Header size increased to allow room for optional flags */
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#define MAX_YUV4_HEADER 80
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#define MAX_FRAME_HEADER 80
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struct frame_attributes {
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int interlaced_frame;
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int top_field_first;
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};
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static int yuv4_read_header(AVFormatContext *s)
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{
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char header[MAX_YUV4_HEADER + 10]; // Include headroom for
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// the longest option
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char *tokstart, *tokend, *header_end;
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int i;
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AVIOContext *pb = s->pb;
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int width = -1, height = -1, raten = 0,
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rated = 0, aspectn = 0, aspectd = 0;
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enum AVPixelFormat pix_fmt = AV_PIX_FMT_NONE, alt_pix_fmt = AV_PIX_FMT_NONE;
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enum AVChromaLocation chroma_sample_location = AVCHROMA_LOC_UNSPECIFIED;
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AVStream *st;
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struct frame_attributes *s1 = s->priv_data;
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for (i = 0; i < MAX_YUV4_HEADER; i++) {
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header[i] = avio_r8(pb);
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if (header[i] == '\n') {
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header[i + 1] = 0x20; // Add a space after last option.
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// Makes parsing "444" vs "444alpha" easier.
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header[i + 2] = 0;
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break;
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}
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}
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if (i == MAX_YUV4_HEADER)
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return -1;
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if (strncmp(header, Y4M_MAGIC, strlen(Y4M_MAGIC)))
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return -1;
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s1->interlaced_frame = 0;
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s1->top_field_first = 0;
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header_end = &header[i + 1]; // Include space
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for (tokstart = &header[strlen(Y4M_MAGIC) + 1];
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tokstart < header_end; tokstart++) {
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if (*tokstart == 0x20)
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continue;
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switch (*tokstart++) {
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case 'W': // Width. Required.
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width = strtol(tokstart, &tokend, 10);
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tokstart = tokend;
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break;
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case 'H': // Height. Required.
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height = strtol(tokstart, &tokend, 10);
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tokstart = tokend;
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break;
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case 'C': // Color space
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if (strncmp("420jpeg", tokstart, 7) == 0) {
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pix_fmt = AV_PIX_FMT_YUV420P;
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chroma_sample_location = AVCHROMA_LOC_CENTER;
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} else if (strncmp("420mpeg2", tokstart, 8) == 0) {
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pix_fmt = AV_PIX_FMT_YUV420P;
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chroma_sample_location = AVCHROMA_LOC_LEFT;
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} else if (strncmp("420paldv", tokstart, 8) == 0) {
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pix_fmt = AV_PIX_FMT_YUV420P;
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chroma_sample_location = AVCHROMA_LOC_TOPLEFT;
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} else if (strncmp("420", tokstart, 3) == 0) {
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pix_fmt = AV_PIX_FMT_YUV420P;
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chroma_sample_location = AVCHROMA_LOC_CENTER;
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} else if (strncmp("411", tokstart, 3) == 0)
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pix_fmt = AV_PIX_FMT_YUV411P;
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else if (strncmp("422", tokstart, 3) == 0)
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pix_fmt = AV_PIX_FMT_YUV422P;
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else if (strncmp("444alpha", tokstart, 8) == 0 ) {
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av_log(s, AV_LOG_ERROR, "Cannot handle 4:4:4:4 "
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"YUV4MPEG stream.\n");
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return -1;
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} else if (strncmp("444", tokstart, 3) == 0)
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pix_fmt = AV_PIX_FMT_YUV444P;
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else if (strncmp("mono", tokstart, 4) == 0) {
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pix_fmt = AV_PIX_FMT_GRAY8;
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} else {
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av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains an unknown "
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"pixel format.\n");
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return -1;
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}
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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case 'I': // Interlace type
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switch (*tokstart++){
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case '?':
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break;
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case 'p':
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s1->interlaced_frame = 0;
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break;
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case 't':
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s1->interlaced_frame = 1;
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s1->top_field_first = 1;
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break;
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case 'b':
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s1->interlaced_frame = 1;
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s1->top_field_first = 0;
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break;
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case 'm':
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av_log(s, AV_LOG_ERROR, "YUV4MPEG stream contains mixed "
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"interlaced and non-interlaced frames.\n");
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return -1;
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default:
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av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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return -1;
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}
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break;
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case 'F': // Frame rate
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sscanf(tokstart, "%d:%d", &raten, &rated); // 0:0 if unknown
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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case 'A': // Pixel aspect
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sscanf(tokstart, "%d:%d", &aspectn, &aspectd); // 0:0 if unknown
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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case 'X': // Vendor extensions
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if (strncmp("YSCSS=", tokstart, 6) == 0) {
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// Older nonstandard pixel format representation
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tokstart += 6;
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if (strncmp("420JPEG", tokstart, 7) == 0)
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alt_pix_fmt = AV_PIX_FMT_YUV420P;
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else if (strncmp("420MPEG2", tokstart, 8) == 0)
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alt_pix_fmt = AV_PIX_FMT_YUV420P;
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else if (strncmp("420PALDV", tokstart, 8) == 0)
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alt_pix_fmt = AV_PIX_FMT_YUV420P;
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else if (strncmp("411", tokstart, 3) == 0)
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alt_pix_fmt = AV_PIX_FMT_YUV411P;
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else if (strncmp("422", tokstart, 3) == 0)
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alt_pix_fmt = AV_PIX_FMT_YUV422P;
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else if (strncmp("444", tokstart, 3) == 0)
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alt_pix_fmt = AV_PIX_FMT_YUV444P;
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}
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while (tokstart < header_end && *tokstart != 0x20)
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tokstart++;
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break;
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}
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}
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if (width == -1 || height == -1) {
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av_log(s, AV_LOG_ERROR, "YUV4MPEG has invalid header.\n");
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return -1;
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}
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if (pix_fmt == AV_PIX_FMT_NONE) {
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if (alt_pix_fmt == AV_PIX_FMT_NONE)
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pix_fmt = AV_PIX_FMT_YUV420P;
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else
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pix_fmt = alt_pix_fmt;
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}
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if (raten <= 0 || rated <= 0) {
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// Frame rate unknown
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raten = 25;
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rated = 1;
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}
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if (aspectn == 0 && aspectd == 0) {
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// Pixel aspect unknown
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aspectd = 1;
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}
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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st->codec->width = width;
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st->codec->height = height;
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av_reduce(&raten, &rated, raten, rated, (1UL << 31) - 1);
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avpriv_set_pts_info(st, 64, rated, raten);
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st->avg_frame_rate = av_inv_q(st->time_base);
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st->codec->pix_fmt = pix_fmt;
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st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
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st->sample_aspect_ratio = (AVRational){ aspectn, aspectd };
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st->codec->chroma_sample_location = chroma_sample_location;
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return 0;
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}
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static int yuv4_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int i;
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char header[MAX_FRAME_HEADER+1];
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int packet_size, width, height, ret;
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AVStream *st = s->streams[0];
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struct frame_attributes *s1 = s->priv_data;
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for (i = 0; i < MAX_FRAME_HEADER; i++) {
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header[i] = avio_r8(s->pb);
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if (header[i] == '\n') {
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header[i + 1] = 0;
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break;
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}
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}
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if (s->pb->error)
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return s->pb->error;
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else if (s->pb->eof_reached)
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return AVERROR_EOF;
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else if (i == MAX_FRAME_HEADER)
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return AVERROR_INVALIDDATA;
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if (strncmp(header, Y4M_FRAME_MAGIC, strlen(Y4M_FRAME_MAGIC)))
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return AVERROR_INVALIDDATA;
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width = st->codec->width;
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height = st->codec->height;
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packet_size = avpicture_get_size(st->codec->pix_fmt, width, height);
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if (packet_size < 0)
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return packet_size;
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ret = av_get_packet(s->pb, pkt, packet_size);
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if (ret < 0)
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return ret;
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else if (ret != packet_size)
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return s->pb->eof_reached ? AVERROR_EOF : AVERROR(EIO);
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if (st->codec->coded_frame) {
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st->codec->coded_frame->interlaced_frame = s1->interlaced_frame;
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st->codec->coded_frame->top_field_first = s1->top_field_first;
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}
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pkt->stream_index = 0;
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return 0;
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}
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static int yuv4_probe(AVProbeData *pd)
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{
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/* check file header */
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if (strncmp(pd->buf, Y4M_MAGIC, sizeof(Y4M_MAGIC) - 1) == 0)
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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AVInputFormat ff_yuv4mpegpipe_demuxer = {
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.name = "yuv4mpegpipe",
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.long_name = NULL_IF_CONFIG_SMALL("YUV4MPEG pipe"),
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.priv_data_size = sizeof(struct frame_attributes),
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.read_probe = yuv4_probe,
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.read_header = yuv4_read_header,
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.read_packet = yuv4_read_packet,
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.extensions = "y4m",
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};
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