/*
  * ARMovie/RPL demuxer
  * Copyright (c) 2007 Christian Ohm, 2008 Eli Friedman
  *
  * 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 <inttypes.h>

 #include <stdlib.h>
 

 #include "libavutil/avstring.h"

 #include "libavutil/dict.h"

 #include "avformat.h"

 #include "internal.h"

 
 #define RPL_SIGNATURE "ARMovie\x0A"
 #define RPL_SIGNATURE_SIZE 8
 
 /** 256 is arbitrary, but should be big enough for any reasonable file. */
 #define RPL_LINE_LENGTH 256
 
 static int rpl_probe(AVProbeData *p)
 {
     if (memcmp(p->buf, RPL_SIGNATURE, RPL_SIGNATURE_SIZE))
         return 0;
 
     return AVPROBE_SCORE_MAX;
 }
 
 typedef struct RPLContext {
     // RPL header data
     int32_t frames_per_chunk;
 
     // Stream position data
     uint32_t chunk_number;
     uint32_t chunk_part;
     uint32_t frame_in_part;
 } RPLContext;
 

 static int read_line(AVIOContext * pb, char* line, int bufsize)

 {
     int i;
     for (i = 0; i < bufsize - 1; i++) {

         int b = avio_r8(pb);

         if (b == 0)
             break;
         if (b == '\n') {
             line[i] = '\0';

             return avio_feof(pb) ? -1 : 0;

         }
         line[i] = b;
     }
     line[i] = '\0';
     return -1;
 }
 
 static int32_t read_int(const char* line, const char** endptr, int* error)
 {
     unsigned long result = 0;
     for (; *line>='0' && *line<='9'; line++) {
         if (result > (0x7FFFFFFF - 9) / 10)
             *error = -1;
         result = 10 * result + *line - '0';
     }
     *endptr = line;
     return result;
 }
 

 static int32_t read_line_and_int(AVIOContext * pb, int* error)

 {
     char line[RPL_LINE_LENGTH];
     const char *endptr;
     *error |= read_line(pb, line, sizeof(line));
     return read_int(line, &endptr, error);
 }
 
 /** Parsing for fps, which can be a fraction. Unfortunately,
   * the spec for the header leaves out a lot of details,
   * so this is mostly guessing.
   */
 static AVRational read_fps(const char* line, int* error)
 {
     int64_t num, den = 1;
     AVRational result;
     num = read_int(line, &line, error);
     if (*line == '.')
         line++;
     for (; *line>='0' && *line<='9'; line++) {
         // Truncate any numerator too large to fit into an int64_t
         if (num > (INT64_MAX - 9) / 10 || den > INT64_MAX / 10)
             break;
         num  = 10 * num + *line - '0';
         den *= 10;
     }
     if (!num)
         *error = -1;
     av_reduce(&result.num, &result.den, num, den, 0x7FFFFFFF);
     return result;
 }
 

 static int rpl_read_header(AVFormatContext *s)

 {

     AVIOContext *pb = s->pb;

     RPLContext *rpl = s->priv_data;
     AVStream *vst = NULL, *ast = NULL;
     int total_audio_size;
     int error = 0;
 
     uint32_t i;
 
     int32_t audio_format, chunk_catalog_offset, number_of_chunks;
     AVRational fps;
 
     char line[RPL_LINE_LENGTH];
 
     // The header for RPL/ARMovie files is 21 lines of text
     // containing the various header fields.  The fields are always
     // in the same order, and other text besides the first
     // number usually isn't important.
     // (The spec says that there exists some significance
     // for the text in a few cases; samples needed.)

     error |= read_line(pb, line, sizeof(line));      // ARMovie

     error |= read_line(pb, line, sizeof(line));      // movie name

     av_dict_set(&s->metadata, "title"    , line, 0);

     error |= read_line(pb, line, sizeof(line));      // date/copyright

     av_dict_set(&s->metadata, "copyright", line, 0);

     error |= read_line(pb, line, sizeof(line));      // author and other

     av_dict_set(&s->metadata, "author"   , line, 0);

 
     // video headers

     vst = avformat_new_stream(s, NULL);

     if (!vst)
         return AVERROR(ENOMEM);

     vst->codec->codec_type      = AVMEDIA_TYPE_VIDEO;

     vst->codec->codec_tag       = read_line_and_int(pb, &error);  // video format
     vst->codec->width           = read_line_and_int(pb, &error);  // video width
     vst->codec->height          = read_line_and_int(pb, &error);  // video height

     vst->codec->bits_per_coded_sample = read_line_and_int(pb, &error);  // video bits per sample

     error |= read_line(pb, line, sizeof(line));                   // video frames per second
     fps = read_fps(line, &error);

     avpriv_set_pts_info(vst, 32, fps.den, fps.num);

 
     // Figure out the video codec
     switch (vst->codec->codec_tag) {
 #if 0
         case 122:

             vst->codec->codec_id = AV_CODEC_ID_ESCAPE122;

             break;
 #endif
         case 124:

             vst->codec->codec_id = AV_CODEC_ID_ESCAPE124;

             // The header is wrong here, at least sometimes

             vst->codec->bits_per_coded_sample = 16;

             break;
         case 130:

             vst->codec->codec_id = AV_CODEC_ID_ESCAPE130;

             break;
         default:

             avpriv_report_missing_feature(s, "Video format %i",
                                           vst->codec->codec_tag);

             vst->codec->codec_id = AV_CODEC_ID_NONE;

     }
 
     // Audio headers
 
     // ARMovie supports multiple audio tracks; I don't have any
     // samples, though. This code will ignore additional tracks.
     audio_format = read_line_and_int(pb, &error);  // audio format ID
     if (audio_format) {

         ast = avformat_new_stream(s, NULL);

         if (!ast)
             return AVERROR(ENOMEM);

         ast->codec->codec_type      = AVMEDIA_TYPE_AUDIO;

         ast->codec->codec_tag       = audio_format;
         ast->codec->sample_rate     = read_line_and_int(pb, &error);  // audio bitrate
         ast->codec->channels        = read_line_and_int(pb, &error);  // number of audio channels

         ast->codec->bits_per_coded_sample = read_line_and_int(pb, &error);  // audio bits per sample

         // At least one sample uses 0 for ADPCM, which is really 4 bits
         // per sample.

         if (ast->codec->bits_per_coded_sample == 0)
             ast->codec->bits_per_coded_sample = 4;

 
         ast->codec->bit_rate = ast->codec->sample_rate *

                                ast->codec->bits_per_coded_sample *

                                ast->codec->channels;
 

         ast->codec->codec_id = AV_CODEC_ID_NONE;

         switch (audio_format) {
             case 1:

                 if (ast->codec->bits_per_coded_sample == 16) {

                     // 16-bit audio is always signed

                     ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE;

                     break;
                 }
                 // There are some other formats listed as legal per the spec;
                 // samples needed.
                 break;
             case 101:

                 if (ast->codec->bits_per_coded_sample == 8) {

                     // The samples with this kind of audio that I have
                     // are all unsigned.

                     ast->codec->codec_id = AV_CODEC_ID_PCM_U8;

                     break;

                 } else if (ast->codec->bits_per_coded_sample == 4) {

                     ast->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_EA_SEAD;

                     break;
                 }
                 break;
         }

         if (ast->codec->codec_id == AV_CODEC_ID_NONE)

             avpriv_request_sample(s, "Audio format %"PRId32,
                                   audio_format);

         avpriv_set_pts_info(ast, 32, 1, ast->codec->bit_rate);

     } else {
         for (i = 0; i < 3; i++)
             error |= read_line(pb, line, sizeof(line));
     }
 
     rpl->frames_per_chunk = read_line_and_int(pb, &error);  // video frames per chunk
     if (rpl->frames_per_chunk > 1 && vst->codec->codec_tag != 124)
         av_log(s, AV_LOG_WARNING,
                "Don't know how to split frames for video format %i. "
                "Video stream will be broken!\n", vst->codec->codec_tag);
 
     number_of_chunks = read_line_and_int(pb, &error);  // number of chunks in the file
     // The number in the header is actually the index of the last chunk.
     number_of_chunks++;
 
     error |= read_line(pb, line, sizeof(line));  // "even" chunk size in bytes
     error |= read_line(pb, line, sizeof(line));  // "odd" chunk size in bytes
     chunk_catalog_offset =                       // offset of the "chunk catalog"
         read_line_and_int(pb, &error);           //   (file index)
     error |= read_line(pb, line, sizeof(line));  // offset to "helpful" sprite
     error |= read_line(pb, line, sizeof(line));  // size of "helpful" sprite
     error |= read_line(pb, line, sizeof(line));  // offset to key frame list
 
     // Read the index

     avio_seek(pb, chunk_catalog_offset, SEEK_SET);

     total_audio_size = 0;

     for (i = 0; !error && i < number_of_chunks; i++) {

         int64_t offset, video_size, audio_size;
         error |= read_line(pb, line, sizeof(line));

         if (3 != sscanf(line, "%"SCNd64" , %"SCNd64" ; %"SCNd64,

                         &offset, &video_size, &audio_size)) {

             error = -1;

             continue;
         }

         av_add_index_entry(vst, offset, i * rpl->frames_per_chunk,
                            video_size, rpl->frames_per_chunk, 0);
         if (ast)
             av_add_index_entry(ast, offset + video_size, total_audio_size,
                                audio_size, audio_size * 8, 0);
         total_audio_size += audio_size * 8;
     }
 
     if (error) return AVERROR(EIO);
 
     return 0;
 }
 
 static int rpl_read_packet(AVFormatContext *s, AVPacket *pkt)
 {
     RPLContext *rpl = s->priv_data;

     AVIOContext *pb = s->pb;

     AVStream* stream;
     AVIndexEntry* index_entry;
     uint32_t ret;
 
     if (rpl->chunk_part == s->nb_streams) {
         rpl->chunk_number++;
         rpl->chunk_part = 0;
     }
 
     stream = s->streams[rpl->chunk_part];
 
     if (rpl->chunk_number >= stream->nb_index_entries)

         return AVERROR_EOF;

 
     index_entry = &stream->index_entries[rpl->chunk_number];
 
     if (rpl->frame_in_part == 0)

         if (avio_seek(pb, index_entry->pos, SEEK_SET) < 0)

             return AVERROR(EIO);
 

     if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO &&

         stream->codec->codec_tag == 124) {
         // We have to split Escape 124 frames because there are
         // multiple frames per chunk in Escape 124 samples.

         uint32_t frame_size;

         avio_skip(pb, 4); /* flags */

         frame_size = avio_rl32(pb);

         if (avio_seek(pb, -8, SEEK_CUR) < 0)

             return AVERROR(EIO);
 
         ret = av_get_packet(pb, pkt, frame_size);
         if (ret != frame_size) {
             av_free_packet(pkt);
             return AVERROR(EIO);
         }
         pkt->duration = 1;
         pkt->pts = index_entry->timestamp + rpl->frame_in_part;
         pkt->stream_index = rpl->chunk_part;
 
         rpl->frame_in_part++;
         if (rpl->frame_in_part == rpl->frames_per_chunk) {
             rpl->frame_in_part = 0;
             rpl->chunk_part++;
         }
     } else {
         ret = av_get_packet(pb, pkt, index_entry->size);
         if (ret != index_entry->size) {
             av_free_packet(pkt);
             return AVERROR(EIO);
         }
 

         if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO) {

             // frames_per_chunk should always be one here; the header
             // parsing will warn if it isn't.
             pkt->duration = rpl->frames_per_chunk;
         } else {
             // All the audio codecs supported in this container
             // (at least so far) are constant-bitrate.
             pkt->duration = ret * 8;
         }
         pkt->pts = index_entry->timestamp;
         pkt->stream_index = rpl->chunk_part;
         rpl->chunk_part++;
     }
 
     // None of the Escape formats have keyframes, and the ADPCM
     // format used doesn't have keyframes.
     if (rpl->chunk_number == 0 && rpl->frame_in_part == 0)

         pkt->flags |= AV_PKT_FLAG_KEY;

 
     return ret;
 }
 

 AVInputFormat ff_rpl_demuxer = {

     .name           = "rpl",

     .long_name      = NULL_IF_CONFIG_SMALL("RPL / ARMovie"),

     .priv_data_size = sizeof(RPLContext),
     .read_probe     = rpl_probe,
     .read_header    = rpl_read_header,
     .read_packet    = rpl_read_packet,

 };