ARMovie/RPL demuxer
Patch by Eli Friedman (eli friedman gmail com) Originally committed as revision 12649 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Eli Friedman
Robert Swain
parent
40d2627306
commit
4fd51ee39a
@ -145,6 +145,7 @@ OBJS-$(CONFIG_RM_DEMUXER) += rmdec.o
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OBJS-$(CONFIG_RM_MUXER) += rmenc.o
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OBJS-$(CONFIG_ROQ_DEMUXER) += idroq.o
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OBJS-$(CONFIG_ROQ_MUXER) += raw.o
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OBJS-$(CONFIG_RPL_DEMUXER) += rpl.o
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OBJS-$(CONFIG_RTP_MUXER) += rtp.o \
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rtpenc.o \
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rtp_mpv.o \
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@ -140,6 +140,7 @@ void av_register_all(void)
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REGISTER_DEMUXER (RL2, rl2);
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REGISTER_MUXDEMUX (RM, rm);
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REGISTER_MUXDEMUX (ROQ, roq);
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REGISTER_DEMUXER (RPL, rpl);
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REGISTER_MUXER (RTP, rtp);
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REGISTER_DEMUXER (RTSP, rtsp);
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REGISTER_DEMUXER (SDP, sdp);
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356
libavformat/rpl.c
Normal file
356
libavformat/rpl.c
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@ -0,0 +1,356 @@
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/*
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* ARMovie/RPL demuxer
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* Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 "avstring.h"
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#include <stdlib.h>
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#define RPL_SIGNATURE "ARMovie\x0A"
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#define RPL_SIGNATURE_SIZE 8
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/** 256 is arbitrary, but should be big enough for any reasonable file. */
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#define RPL_LINE_LENGTH 256
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static int rpl_probe(AVProbeData *p)
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{
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if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
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return 0;
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return AVPROBE_SCORE_MAX;
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}
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typedef struct RPLContext {
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// RPL header data
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int32_t frames_per_chunk;
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// Stream position data
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uint32_t chunk_number;
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uint32_t chunk_part;
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uint32_t frame_in_part;
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} RPLContext;
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static int read_line(ByteIOContext * pb, char* line, int bufsize)
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{
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int i;
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for (i = 0; i < bufsize - 1; i++) {
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int b = get_byte(pb);
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if (b == 0)
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break;
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if (b == '\n') {
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line[i] = '\0';
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return 0;
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}
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line[i] = b;
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}
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line[i] = '\0';
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return -1;
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}
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static int32_t read_int(const char* line, const char** endptr, int* error)
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{
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unsigned long result = 0;
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for (; *line>='0' && *line<='9'; line++) {
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if (result > (0x7FFFFFFF - 9) / 10)
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*error = -1;
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result = 10 * result + *line - '0';
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}
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*endptr = line;
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return result;
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}
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static int32_t read_line_and_int(ByteIOContext * pb, int* error)
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{
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char line[RPL_LINE_LENGTH];
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const char *endptr;
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*error |= read_line(pb, line, sizeof(line));
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return read_int(line, &endptr, error);
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}
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/** Parsing for fps, which can be a fraction. Unfortunately,
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* the spec for the header leaves out a lot of details,
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* so this is mostly guessing.
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*/
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static AVRational read_fps(const char* line, int* error)
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{
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int64_t num, den = 1;
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AVRational result;
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num = read_int(line, &line, error);
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if (*line == '.')
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line++;
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for (; *line>='0' && *line<='9'; line++) {
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// Truncate any numerator too large to fit into an int64_t
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if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
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break;
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num = 10 * num + *line - '0';
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den *= 10;
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}
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if (!num)
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*error = -1;
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av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
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return result;
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}
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static int rpl_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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ByteIOContext *pb = s->pb;
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RPLContext *rpl = s->priv_data;
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AVStream *vst = NULL, *ast = NULL;
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int total_audio_size;
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int error = 0;
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uint32_t i;
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int32_t audio_format, chunk_catalog_offset, number_of_chunks;
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AVRational fps;
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char line[RPL_LINE_LENGTH];
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// The header for RPL/ARMovie files is 21 lines of text
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// containing the various header fields. The fields are always
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// in the same order, and other text besides the first
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// number usually isn't important.
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// (The spec says that there exists some significance
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// for the text in a few cases; samples needed.)
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error |= read_line(pb, line , sizeof(line )); // ARMovie
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error |= read_line(pb, s->title , sizeof(s->title )); // movie name
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error |= read_line(pb, s->copyright, sizeof(s->copyright)); // date/copyright
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error |= read_line(pb, s->author , sizeof(s->author )); // author and other
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// video headers
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vst = av_new_stream(s, 0);
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if (!vst)
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return AVERROR(ENOMEM);
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vst->codec->codec_type = CODEC_TYPE_VIDEO;
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vst->codec->codec_tag = read_line_and_int(pb, &error); // video format
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vst->codec->width = read_line_and_int(pb, &error); // video width
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vst->codec->height = read_line_and_int(pb, &error); // video height
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vst->codec->bits_per_sample = read_line_and_int(pb, &error); // video bits per sample
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error |= read_line(pb, line, sizeof(line)); // video frames per second
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fps = read_fps(line, &error);
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av_set_pts_info(vst, 32, fps.den, fps.num);
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// Figure out the video codec
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switch (vst->codec->codec_tag) {
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#if 0
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case 122:
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vst->codec->codec_id = CODEC_ID_ESCAPE122;
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break;
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#endif
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case 124:
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vst->codec->codec_id = CODEC_ID_ESCAPE124;
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// The header is wrong here, at least sometimes
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vst->codec->bits_per_sample = 16;
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break;
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#if 0
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case 130:
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vst->codec->codec_id = CODEC_ID_ESCAPE130;
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break;
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#endif
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default:
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av_log(s, AV_LOG_WARNING,
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"RPL video format %i not supported yet!\n",
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vst->codec->codec_tag);
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vst->codec->codec_id = CODEC_ID_NONE;
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}
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// Audio headers
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// ARMovie supports multiple audio tracks; I don't have any
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// samples, though. This code will ignore additional tracks.
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audio_format = read_line_and_int(pb, &error); // audio format ID
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if (audio_format) {
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ast = av_new_stream(s, 0);
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if (!ast)
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return AVERROR(ENOMEM);
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ast->codec->codec_type = CODEC_TYPE_AUDIO;
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ast->codec->codec_tag = audio_format;
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ast->codec->sample_rate = read_line_and_int(pb, &error); // audio bitrate
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ast->codec->channels = read_line_and_int(pb, &error); // number of audio channels
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ast->codec->bits_per_sample = read_line_and_int(pb, &error); // audio bits per sample
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// At least one sample uses 0 for ADPCM, which is really 4 bits
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// per sample.
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if (ast->codec->bits_per_sample == 0)
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ast->codec->bits_per_sample = 4;
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ast->codec->bit_rate = ast->codec->sample_rate *
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ast->codec->bits_per_sample *
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ast->codec->channels;
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ast->codec->codec_id = CODEC_ID_NONE;
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switch (audio_format) {
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case 1:
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if (ast->codec->bits_per_sample == 16) {
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// 16-bit audio is always signed
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ast->codec->codec_id = CODEC_ID_PCM_S16LE;
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break;
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}
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// There are some other formats listed as legal per the spec;
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// samples needed.
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break;
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case 101:
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if (ast->codec->bits_per_sample == 8) {
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// The samples with this kind of audio that I have
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// are all unsigned.
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ast->codec->codec_id = CODEC_ID_PCM_U8;
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break;
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} else if (ast->codec->bits_per_sample == 4) {
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ast->codec->codec_id = CODEC_ID_ADPCM_IMA_EA_SEAD;
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break;
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}
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break;
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}
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if (ast->codec->codec_id == CODEC_ID_NONE) {
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av_log(s, AV_LOG_WARNING,
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"RPL audio format %i not supported yet!\n",
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audio_format);
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}
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av_set_pts_info(ast, 32, 1, ast->codec->bit_rate);
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} else {
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for (i = 0; i < 3; i++)
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error |= read_line(pb, line, sizeof(line));
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}
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rpl->frames_per_chunk = read_line_and_int(pb, &error); // video frames per chunk
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if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124)
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av_log(s, AV_LOG_WARNING,
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"Don't know how to split frames for video format %i. "
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"Video stream will be broken!\n", vst->codec->codec_tag);
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number_of_chunks = read_line_and_int(pb, &error); // number of chunks in the file
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// The number in the header is actually the index of the last chunk.
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number_of_chunks++;
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error |= read_line(pb, line, sizeof(line)); // "even" chunk size in bytes
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error |= read_line(pb, line, sizeof(line)); // "odd" chunk size in bytes
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chunk_catalog_offset = // offset of the "chunk catalog"
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read_line_and_int(pb, &error); // (file index)
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error |= read_line(pb, line, sizeof(line)); // offset to "helpful" sprite
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error |= read_line(pb, line, sizeof(line)); // size of "helpful" sprite
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error |= read_line(pb, line, sizeof(line)); // offset to key frame list
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// Read the index
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url_fseek(pb, chunk_catalog_offset, SEEK_SET);
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total_audio_size = 0;
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for (i = 0; i < number_of_chunks; i++) {
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int64_t offset, video_size, audio_size;
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error |= read_line(pb, line, sizeof(line));
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if (3 != sscanf(line, "%"PRId64" , %"PRId64" ; %"PRId64,
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&offset, &video_size, &audio_size))
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error = -1;
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av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
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video_size, rpl->frames_per_chunk, 0);
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if (ast)
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av_add_index_entry(ast, offset + video_size, total_audio_size,
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audio_size, audio_size * 8, 0);
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total_audio_size += audio_size * 8;
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}
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if (error) return AVERROR(EIO);
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return 0;
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}
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static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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RPLContext *rpl = s->priv_data;
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ByteIOContext *pb = s->pb;
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AVStream* stream;
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AVIndexEntry* index_entry;
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uint32_t ret;
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if (rpl->chunk_part == s->nb_streams) {
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rpl->chunk_number++;
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rpl->chunk_part = 0;
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}
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stream = s->streams[rpl->chunk_part];
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if (rpl->chunk_number >= stream->nb_index_entries)
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return -1;
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index_entry = &stream->index_entries[rpl->chunk_number];
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if (rpl->frame_in_part == 0)
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if (url_fseek(pb, index_entry->pos, SEEK_SET) < 0)
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return AVERROR(EIO);
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if (stream->codec->codec_type == CODEC_TYPE_VIDEO &&
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stream->codec->codec_tag == 124) {
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// We have to split Escape 124 frames because there are
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// multiple frames per chunk in Escape 124 samples.
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uint32_t frame_size, frame_flags;
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frame_flags = get_le32(pb);
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frame_size = get_le32(pb);
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if (url_fseek(pb, -8, SEEK_CUR) < 0)
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return AVERROR(EIO);
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ret = av_get_packet(pb, pkt, frame_size);
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if (ret != frame_size) {
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av_free_packet(pkt);
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return AVERROR(EIO);
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}
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pkt->duration = 1;
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pkt->pts = index_entry->timestamp + rpl->frame_in_part;
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pkt->stream_index = rpl->chunk_part;
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rpl->frame_in_part++;
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if (rpl->frame_in_part == rpl->frames_per_chunk) {
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rpl->frame_in_part = 0;
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rpl->chunk_part++;
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}
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} else {
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ret = av_get_packet(pb, pkt, index_entry->size);
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if (ret != index_entry->size) {
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av_free_packet(pkt);
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return AVERROR(EIO);
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}
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if (stream->codec->codec_type == CODEC_TYPE_VIDEO) {
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// frames_per_chunk should always be one here; the header
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// parsing will warn if it isn't.
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pkt->duration = rpl->frames_per_chunk;
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} else {
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// All the audio codecs supported in this container
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// (at least so far) are constant-bitrate.
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pkt->duration = ret * 8;
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}
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pkt->pts = index_entry->timestamp;
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pkt->stream_index = rpl->chunk_part;
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rpl->chunk_part++;
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}
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// None of the Escape formats have keyframes, and the ADPCM
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// format used doesn't have keyframes.
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if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)
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pkt->flags |= PKT_FLAG_KEY;
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return ret;
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}
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AVInputFormat rpl_demuxer = {
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"rpl",
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"RPL/ARMovie format",
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sizeof(RPLContext),
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rpl_probe,
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rpl_read_header,
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rpl_read_packet,
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};
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Loading…
Reference in New Issue
Block a user