avformat/http: return EINVAL if ff_http_do_new_request is called with non-http URLContext
[ffmpeg.git] / libavformat / bethsoftvid.c
index 4406659..f516806 100644 (file)
  */
 
 /**
- * @file bethsoftvid.c
+ * @file
  * @brief Bethesda Softworks VID (.vid) file demuxer
  * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
- * @sa http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
- * @sa http://www.svatopluk.com/andux/docs/dfvid.html
+ * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
+ * @see http://www.svatopluk.com/andux/docs/dfvid.html
  */
 
+#include "libavutil/channel_layout.h"
+#include "libavutil/intreadwrite.h"
 #include "avformat.h"
-#include "bethsoftvideo.h"
+#include "internal.h"
+#include "libavcodec/bethsoftvideo.h"
+
+#define BVID_PALETTE_SIZE 3 * 256
+
+#define DEFAULT_SAMPLE_RATE 11111
 
 typedef struct BVID_DemuxContext
 {
     int nframes;
+    int sample_rate;        /**< audio sample rate */
+    int width;              /**< video width       */
+    int height;             /**< video height      */
     /** delay value between frames, added to individual frame delay.
      * custom units, which will be added to other custom units (~=16ms according
      * to free, unofficial documentation) */
     int bethsoft_global_delay;
-
-    /** video presentation time stamp.
-     * delay = 16 milliseconds * (global_delay + per_frame_delay) */
-    int video_pts;
+    int video_index;        /**< video stream index */
+    int audio_index;        /**< audio stream index */
+    uint8_t *palette;
 
     int is_finished;
 
@@ -48,80 +57,91 @@ typedef struct BVID_DemuxContext
 
 static int vid_probe(AVProbeData *p)
 {
-    // little endian VID tag, file starts with "VID\0"
+    // little-endian VID tag, file starts with "VID\0"
     if (AV_RL32(p->buf) != MKTAG('V', 'I', 'D', 0))
         return 0;
 
+    if (p->buf[4] != 2)
+        return AVPROBE_SCORE_MAX / 4;
+
     return AVPROBE_SCORE_MAX;
 }
 
-static int vid_read_header(AVFormatContext *s,
-                            AVFormatParameters *ap)
+static int vid_read_header(AVFormatContext *s)
 {
     BVID_DemuxContext *vid = s->priv_data;
-    ByteIOContext *pb = &s->pb;
-    AVStream *stream;
+    AVIOContext *pb = s->pb;
 
     /* load main header. Contents:
     *    bytes: 'V' 'I' 'D'
     *    int16s: always_512, nframes, width, height, delay, always_14
     */
-    url_fseek(pb, 5, SEEK_CUR);
-    vid->nframes = get_le16(pb);
-
-    stream = av_new_stream(s, 0);
-    if (!stream)
-        return AVERROR(ENOMEM);
-    av_set_pts_info(stream, 32, 1, 60);     // 16 ms increments, i.e. 60 fps
-    stream->codec->codec_type = CODEC_TYPE_VIDEO;
-    stream->codec->codec_id = CODEC_ID_BETHSOFTVID;
-    stream->codec->width = get_le16(pb);
-    stream->codec->height = get_le16(pb);
-    stream->codec->pix_fmt = PIX_FMT_PAL8;
-    vid->bethsoft_global_delay = get_le16(pb);
-    get_le16(pb);
-
-    // done with video codec, set up audio codec
-    stream = av_new_stream(s, 0);
-    if (!stream)
-        return AVERROR(ENOMEM);
-    stream->codec->codec_type = CODEC_TYPE_AUDIO;
-    stream->codec->codec_id = CODEC_ID_PCM_U8;
-    stream->codec->channels = 1;
-    stream->codec->sample_rate = 11025;
-    stream->codec->bits_per_sample = 8;
-    stream->codec->bit_rate = stream->codec->channels * stream->codec->sample_rate * stream->codec->bits_per_sample;
+    avio_skip(pb, 5);
+    vid->nframes = avio_rl16(pb);
+    vid->width   = avio_rl16(pb);
+    vid->height  = avio_rl16(pb);
+    vid->bethsoft_global_delay = avio_rl16(pb);
+    avio_rl16(pb);
+
+    // wait until the first packet to create each stream
+    vid->video_index = -1;
+    vid->audio_index = -1;
+    vid->sample_rate = DEFAULT_SAMPLE_RATE;
+    s->ctx_flags |= AVFMTCTX_NOHEADER;
 
     return 0;
 }
 
 #define BUFFER_PADDING_SIZE 1000
-static int read_frame(BVID_DemuxContext *vid, ByteIOContext *pb, AVPacket *pkt,
-                      uint8_t block_type, AVFormatContext *s, int npixels)
+static int read_frame(BVID_DemuxContext *vid, AVIOContext *pb, AVPacket *pkt,
+                      uint8_t block_type, AVFormatContext *s)
 {
     uint8_t * vidbuf_start = NULL;
     int vidbuf_nbytes = 0;
     int code;
     int bytes_copied = 0;
-    int position;
+    int position, duration, npixels;
     unsigned int vidbuf_capacity;
+    int ret = 0;
+    AVStream *st;
+
+    if (vid->video_index < 0) {
+        st = avformat_new_stream(s, NULL);
+        if (!st)
+            return AVERROR(ENOMEM);
+        vid->video_index = st->index;
+        if (vid->audio_index < 0) {
+            avpriv_request_sample(s, "Using default video time base since "
+                                  "having no audio packet before the first "
+                                  "video packet");
+        }
+        avpriv_set_pts_info(st, 64, 185, vid->sample_rate);
+        st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
+        st->codecpar->codec_id   = AV_CODEC_ID_BETHSOFTVID;
+        st->codecpar->width      = vid->width;
+        st->codecpar->height     = vid->height;
+    }
+    st      = s->streams[vid->video_index];
+    npixels = st->codecpar->width * st->codecpar->height;
 
     vidbuf_start = av_malloc(vidbuf_capacity = BUFFER_PADDING_SIZE);
     if(!vidbuf_start)
         return AVERROR(ENOMEM);
 
     // save the file position for the packet, include block type
-    position = url_ftell(pb) - 1;
+    position = avio_tell(pb) - 1;
 
     vidbuf_start[vidbuf_nbytes++] = block_type;
 
-    // get the video delay (next int16), and set the presentation time
-    vid->video_pts += vid->bethsoft_global_delay + get_le16(pb);
+    // get the current packet duration
+    duration = vid->bethsoft_global_delay + avio_rl16(pb);
 
     // set the y offset if it exists (decoder header data should be in data section)
     if(block_type == VIDEO_YOFF_P_FRAME){
-        if(get_buffer(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2)
+        if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], 2) != 2) {
+            ret = AVERROR(EIO);
             goto fail;
+        }
         vidbuf_nbytes += 2;
     }
 
@@ -130,104 +150,153 @@ static int read_frame(BVID_DemuxContext *vid, ByteIOContext *pb, AVPacket *pkt,
         if(!vidbuf_start)
             return AVERROR(ENOMEM);
 
-        code = get_byte(pb);
+        code = avio_r8(pb);
         vidbuf_start[vidbuf_nbytes++] = code;
 
         if(code >= 0x80){ // rle sequence
             if(block_type == VIDEO_I_FRAME)
-                vidbuf_start[vidbuf_nbytes++] = get_byte(pb);
+                vidbuf_start[vidbuf_nbytes++] = avio_r8(pb);
         } else if(code){ // plain sequence
-            if(get_buffer(pb, &vidbuf_start[vidbuf_nbytes], code) != code)
+            if (avio_read(pb, &vidbuf_start[vidbuf_nbytes], code) != code) {
+                ret = AVERROR(EIO);
                 goto fail;
+            }
             vidbuf_nbytes += code;
         }
         bytes_copied += code & 0x7F;
         if(bytes_copied == npixels){ // sometimes no stop character is given, need to keep track of bytes copied
             // may contain a 0 byte even if read all pixels
-            if(get_byte(pb))
-                url_fseek(pb, -1, SEEK_CUR);
+            if(avio_r8(pb))
+                avio_seek(pb, -1, SEEK_CUR);
             break;
         }
-        if(bytes_copied > npixels)
+        if (bytes_copied > npixels) {
+            ret = AVERROR_INVALIDDATA;
             goto fail;
+        }
     } while(code);
 
     // copy data into packet
-    if(av_new_packet(pkt, vidbuf_nbytes) < 0)
+    if ((ret = av_new_packet(pkt, vidbuf_nbytes)) < 0)
         goto fail;
     memcpy(pkt->data, vidbuf_start, vidbuf_nbytes);
-    av_free(vidbuf_start);
 
     pkt->pos = position;
-    pkt->stream_index = 0;  // use the video decoder, which was initialized as the first stream
-    pkt->pts = vid->video_pts;
+    pkt->stream_index = vid->video_index;
+    pkt->duration = duration;
+    if (block_type == VIDEO_I_FRAME)
+        pkt->flags |= AV_PKT_FLAG_KEY;
+
+    /* if there is a new palette available, add it to packet side data */
+    if (vid->palette) {
+        uint8_t *pdata = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
+                                                 BVID_PALETTE_SIZE);
+        if (!pdata) {
+            ret = AVERROR(ENOMEM);
+            av_log(s, AV_LOG_ERROR, "Failed to allocate palette side data\n");
+            goto fail;
+        }
+        memcpy(pdata, vid->palette, BVID_PALETTE_SIZE);
+
+        av_freep(&vid->palette);
+    }
 
     vid->nframes--;  // used to check if all the frames were read
-    return vidbuf_nbytes;
 fail:
     av_free(vidbuf_start);
-    return -1;
+    return ret;
 }
 
 static int vid_read_packet(AVFormatContext *s,
                            AVPacket *pkt)
 {
     BVID_DemuxContext *vid = s->priv_data;
-    ByteIOContext *pb = &s->pb;
+    AVIOContext *pb = s->pb;
     unsigned char block_type;
     int audio_length;
     int ret_value;
 
-    if(vid->is_finished || url_feof(pb))
-        return AVERROR_IO;
+    if(vid->is_finished || avio_feof(pb))
+        return AVERROR_EOF;
 
-    block_type = get_byte(pb);
+    block_type = avio_r8(pb);
     switch(block_type){
         case PALETTE_BLOCK:
-            url_fseek(pb, -1, SEEK_CUR);     // include block type
-            ret_value = av_get_packet(pb, pkt, 3 * 256 + 1);
-            if(ret_value != 3 * 256 + 1){
-                av_free_packet(pkt);
-                return AVERROR_IO;
+            if (vid->palette) {
+                av_log(s, AV_LOG_WARNING, "discarding unused palette\n");
+                av_freep(&vid->palette);
             }
-            pkt->stream_index = 0;
-            return ret_value;
+            vid->palette = av_malloc(BVID_PALETTE_SIZE);
+            if (!vid->palette)
+                return AVERROR(ENOMEM);
+            if (avio_read(pb, vid->palette, BVID_PALETTE_SIZE) != BVID_PALETTE_SIZE) {
+                av_freep(&vid->palette);
+                return AVERROR(EIO);
+            }
+            return vid_read_packet(s, pkt);
 
         case FIRST_AUDIO_BLOCK:
-            get_le16(pb);
+            avio_rl16(pb);
             // soundblaster DAC used for sample rate, as on specification page (link above)
-            s->streams[1]->codec->sample_rate = 1000000 / (256 - get_byte(pb));
-            s->streams[1]->codec->bit_rate = s->streams[1]->codec->channels * s->streams[1]->codec->sample_rate * s->streams[1]->codec->bits_per_sample;
+            vid->sample_rate = 1000000 / (256 - avio_r8(pb));
         case AUDIO_BLOCK:
-            audio_length = get_le16(pb);
-            ret_value = av_get_packet(pb, pkt, audio_length);
-            pkt->stream_index = 1;
-            return (ret_value != audio_length ? AVERROR_IO : ret_value);
+            if (vid->audio_index < 0) {
+                AVStream *st = avformat_new_stream(s, NULL);
+                if (!st)
+                    return AVERROR(ENOMEM);
+                vid->audio_index                 = st->index;
+                st->codecpar->codec_type            = AVMEDIA_TYPE_AUDIO;
+                st->codecpar->codec_id              = AV_CODEC_ID_PCM_U8;
+                st->codecpar->channels              = 1;
+                st->codecpar->channel_layout        = AV_CH_LAYOUT_MONO;
+                st->codecpar->bits_per_coded_sample = 8;
+                st->codecpar->sample_rate           = vid->sample_rate;
+                st->codecpar->bit_rate              = 8 * st->codecpar->sample_rate;
+                st->start_time                   = 0;
+                avpriv_set_pts_info(st, 64, 1, vid->sample_rate);
+            }
+            audio_length = avio_rl16(pb);
+            if ((ret_value = av_get_packet(pb, pkt, audio_length)) != audio_length) {
+                if (ret_value < 0)
+                    return ret_value;
+                av_log(s, AV_LOG_ERROR, "incomplete audio block\n");
+                return AVERROR(EIO);
+            }
+            pkt->stream_index = vid->audio_index;
+            pkt->duration     = audio_length;
+            pkt->flags |= AV_PKT_FLAG_KEY;
+            return 0;
 
         case VIDEO_P_FRAME:
         case VIDEO_YOFF_P_FRAME:
         case VIDEO_I_FRAME:
-            return read_frame(vid, pb, pkt, block_type, s,
-                              s->streams[0]->codec->width * s->streams[0]->codec->height);
+            return read_frame(vid, pb, pkt, block_type, s);
 
         case EOF_BLOCK:
             if(vid->nframes != 0)
                 av_log(s, AV_LOG_VERBOSE, "reached terminating character but not all frames read.\n");
             vid->is_finished = 1;
-            return AVERROR_IO;
+            return AVERROR(EIO);
         default:
             av_log(s, AV_LOG_ERROR, "unknown block (character = %c, decimal = %d, hex = %x)!!!\n",
-                   block_type, block_type, block_type); return -1;
+                   block_type, block_type, block_type);
+            return AVERROR_INVALIDDATA;
     }
+}
 
+static int vid_read_close(AVFormatContext *s)
+{
+    BVID_DemuxContext *vid = s->priv_data;
+    av_freep(&vid->palette);
     return 0;
 }
 
-AVInputFormat bethsoftvid_demuxer = {
-    "bethsoftvid",
-    "Bethesda Softworks 'Daggerfall' VID format",
-    sizeof(BVID_DemuxContext),
-    vid_probe,
-    vid_read_header,
-    vid_read_packet,
+AVInputFormat ff_bethsoftvid_demuxer = {
+    .name           = "bethsoftvid",
+    .long_name      = NULL_IF_CONFIG_SMALL("Bethesda Softworks VID"),
+    .priv_data_size = sizeof(BVID_DemuxContext),
+    .read_probe     = vid_probe,
+    .read_header    = vid_read_header,
+    .read_packet    = vid_read_packet,
+    .read_close     = vid_read_close,
 };